JP5912307B2 - Image reading device - Google Patents

Description

  The present invention relates to an image reading apparatus such as a scanner device, a copying machine, or a facsimile, and relates to an improvement in a light source mechanism that changes a reading irradiation direction in accordance with a document image.

  In general, this type of image reading apparatus is arranged in a platen, a light source that irradiates the reading surface with reading light, a reflecting mirror that deflects reflected light from the reading surface in a predetermined direction, and a reading light path formed by the reflecting mirror. And a photoelectric conversion sensor that photoelectrically converts light from the lens.

  For example, Patent Document 1 discloses an image reading apparatus provided with a reading mechanism of a reduction optical system. In Document 1, a light source lamp, a reflection mirror, a condenser lens, and a sensor substrate are arranged on a carriage that reciprocates along a platen, and each optical element is arranged in an imaging optical path. Although not disclosed in this document, the condensing lens is configured to be movable along the optical path, and is configured to be position-adjustable so that the read image is accurately formed on the sensor substrate located behind. .

  The sensor substrate is also configured so that photoelectric conversion elements are arranged on a line and the height position of the substrate can be adjusted. The reading accuracy is optimized by adjusting the lens position and the sensor position in accordance with the assembly accuracy of the reading optical path.

  The light source is configured to read the diffused light from the uneven surface (surface roughness) of the image so that the diffused light is directed to the reading optical path with respect to the reading surface. The light source in this case is configured to irradiate linear light in the reading line direction from a direction obliquely inclined to the reading surface and read reflected light from the image surface. This is because the surface of the image has fine irregularities (surface roughness), and the reflected light from the original is read by irradiating diffused light.

  Therefore, when reading glossy originals (for example, metal foil characters) with a flat image surface, the reflected light is not output in the direction of the reading optical path because of the diffused light. It is necessary to create read data by combining image data. The configuration of this regular reflection light source is proposed in, for example, Patent Document 2.

  In this document, there is an optical configuration in which a half mirror is arranged directly under the reading surface, light is irradiated from the back of the mirror toward the reading surface, and reflected light from the reading surface is guided to the condenser lens through the half mirror. Proposed. With such a configuration, even if the image surface is a smooth glossy surface, reflected light can be output to the reading optical path.

JP 2005-234297 A JP 2000-123152 A

  When reading an image original including a glossy image as described above, conventionally, a light source (diffuse light source) for inputting diffused light and a light source (specularly reflected light source) for inputting specularly reflected light are provided, It is known to read an image having a glossy surface by synthesizing read data of the light sources.

  In this case, the regular reflection light source irradiates light from the same angle direction with respect to the reading optical path in the normal direction of the reading surface, and Patent Document 2 discloses a reflection mirror that first reflects light from the reading surface as a half mirror. It has been proposed to have a structure. The reading optical path is shown in FIG. 13A, but there is a drawback that the capacity of the light source becomes large because the reading light is greatly attenuated as will be described later.

  Therefore, as shown in FIG. 13B, a light source is arranged adjacent to the first reflecting mirror (102), and is regularly reflected at a position close to the reading optical path (101) in the normal direction of the reading surface (100). It is known to arrange a light source (105).

  In this way, an image close to a smooth image can be read by arranging a specular reflection light source next to the reading optical path and bringing the irradiation angle (η) close to zero. With such a light source arrangement, a smooth screen close to this can be read except for a completely smooth image without having a reflecting mirror having a half mirror structure.

  Explaining the problems in the above-described conventional configuration, as shown in FIG. 13A, the “half mirror structure” is the amount of light emitted from the specular reflection light source disposed on the back of the half mirror. Is attenuated, and when the reflected light from the reading surface is reflected toward the reading optical path, the light amount of 1/2 is attenuated. Therefore, a light source amount that is four times the light input to the reading optical path is required.

  In the case of the “light source approach arrangement structure”, it is a smooth image reading condition that the irradiation angle (η) of the light source is as close to zero as possible, but in order to make the angle (η) close to zero, a reflection mirror ( 102) must be miniaturized. In particular, it is necessary to reduce the mirror width in the sub-scanning direction. On the other hand, since the mirror length in the line direction (length in the main scanning direction) is set by the reading length, the mirror shape is very thin and long. In this way, the elongated irregularly shaped mirror is easily deformed by twisting and the like, causing problems in assembly to the apparatus frame, state change, position accuracy, and the like.

  Therefore, conventionally, the irradiation angle (η) of the light source is set to such an extent that the mirror accuracy can be ensured, and the glossy surface can be read within a limited range. Accordingly, the gloss image that can be read is limited to a certain range, and a glossy surface with high smoothness cannot be read.

  Along with this, a problem occurs that the reading sensor is saturated. As shown in FIG. 13B, when light is emitted from the direction of the normal to the reading surface and the angle (η), and input to the sensor through the reading optical path (101) in the normal direction, the amount of light is attenuated. W% of light (for example, η = 3 degrees, w = 30%) is input to the sensor. Therefore, the image processing circuit amplifies w% light and corrects it to, for example, 100% light quantity.

At this time, if the image plane is inclined at a certain angle, for example, a 1 / 2η angle, 100% light is input to the sensor without being attenuated. On the other hand, the amplifier circuit of the sensor is configured to amplify the input to a 100% input value with a 30% attenuation input as a maximum input value. Accordingly, when the image original is set to be tilted on the reading surface, the reading light input to the sensor is amplified and the sensor is saturated. The problem of poor read image quality occurs due to the saturation of the sensor.

  Therefore, the present inventor configures the substrate constituting the reflecting mirror into a shape that can ensure the manufacturing accuracy and the fixing accuracy, and forms a part of the mirror substrate on the reflecting surface and the light transmitting surface to thereby form the light source described above. The inventors have found that the irradiation angle (η) can be set very small. Furthermore, the inventor has come up with the idea that it is possible to solve the problem of saturation of the sensor by setting the incident angle of the light irradiated from the light source to the reading surface and the angle of the reading light from the reading surface to the mirror to be equal.

  In the present invention, a light source lamp and a reflection mirror arranged at positions adjacent to and opposite to the image reading surface can be arranged at very close positions, and an image capable of reading a glossy image with faithful image quality. The problem is to provide a reader. Another object of the present invention is to solve image quality deterioration caused by saturation of a reading sensor when reading a glossy image.

  In the present invention, the incident angle of light with respect to the reading surface refers to an angle between a normal line of the reading surface and a light beam positioned at the center of the light beam. In order to achieve the above object, according to the present invention, a first light source having a predetermined incident angle and a second light source having an incident angle smaller than the predetermined incident angle are arranged on a reading surface, and reflected light from the reading surface is read in common. Perform photoelectric conversion in the optical path. At this time, one of a plurality of reflecting mirrors arranged in the reading optical path is formed on the surface of the translucent plate-like material by forming a coating surface for specularly reflecting light and an uncoated surface for transmitting light. Then, the reading surface is irradiated with light from the second light source. At the same time, the irradiation angle of the light from the second light source and the angle of the reading optical path are set to substantially the same angle.

  More specifically, the configuration is a device that reads a glossy image with reflected light emitted from a plurality of light sources arranged in different angular directions on the reading surface, and includes a platen having the reading surface and a predetermined incident angle on the reading surface. A first light source for irradiating the linear light with the first light source, a second light source for irradiating the reading surface with the linear light at an incident angle smaller than the predetermined incident angle, the specularly reflected light of the second light source from the reading surface and the first A plurality of reflecting mirrors for deflecting diffusely reflected light of the light source toward a common reading optical path, a condensing lens arranged in the reading optical path, and condensing the reading light from the reading surface at a predetermined imaging position; and a condensing lens A reading element substrate on which the photoelectric conversion element array is arranged at the image forming position, and a lens position adjusting means for adjusting the position of the condenser lens in the reading optical path.

  Light that is emitted from the first light source and reflected from the reading surface is first reading light, and light that is emitted from the second light source and reflected from the reading surface is second reading light. The first second light source and the plurality of reflecting mirrors have the same irradiation angle from the second light source with reference to the normal line of the reading surface and the angle of the first reading light toward the reading optical path from the reading surface, The angle of the second reading light from the reading surface toward the reading optical path is set to be smaller than the irradiation angle from the first light source with reference to the normal line of the reading surface. Further, at this time, the first reading light and the second reading light have substantially the same angle.

One of the plurality of reflection mirrors is formed of a light-transmitting plate-like material having a coating surface that reflects light specularly on a surface and an uncoated surface that transmits light, and an end surface in contact with the non-coating surface is The first light guide is chamfered so as to be parallel to the reading surface, the first light guide is disposed between the platen and one mirror reflection surface of the plurality of reflection mirrors, and the second light guide is The irradiation light is arranged on the back side of one of the plurality of reflection mirrors so as to pass through one uncoated surface of the plurality of reflection mirrors.

  In the present invention, when the second light source that is a specular reflection light source and the reflecting mirror are provided facing the reading surface to read the glossy image, the mirror is subjected to surface processing to a coated surface and a non-coated surface that are specularly reflected, Since the light source is arranged on the back surface of the non-coating surface and the irradiation angle from the second light source and the angle of the reading light path are set to be equal, the following effects are obtained.

  A reflecting mirror having a coated surface and an uncoated surface can be manufactured with a relatively large shape (particularly, the mirror width in the sub-scanning direction). For this reason, the reflecting mirror can be securely fixed to a frame such as an optical carriage without being exhausted, and is less likely to be deformed, distorted or damaged by an external force such as an impact. Therefore, the reflection mirror is easy to manufacture and can be easily incorporated into the apparatus.

  The reflection mirror is divided into a coating surface and a non-coating surface by a surface coating. Light from the light source is irradiated from the back of the non-coating surface, and the reading light path of the coating surface can be brought close to the irradiation light of the non-coating surface. Light can be emitted from an angular direction close to the normal of the surface. For this reason, it is possible to read with high image quality without inferior reading quality of the glossy surface.

  Further, by setting the irradiation angle of the specular reflection light source and the incident light incident angle of the reading light substantially equal to each other with respect to the normal line of the reading surface, the photoelectric sensor can be read with an accurate image quality without being saturated.

  Further, in the present invention, the translucent plate-like material forming the non-coating surface is composed of a material having a refractive index larger than that of air, such as glass or synthetic resin, so that the light irradiated from the second light source toward the reading surface When passing through the reflecting mirror, the light beam is bent at a refraction angle corresponding to the refractive index, and the position of the second light source is displaced from the virtual light source. As a result, the position of the lamp of the second light source can be shifted in a direction away from the condenser lens of the imaging optical system, so that the apparatus layout can be reduced in size.

1 is an explanatory diagram of the overall configuration of an image reading apparatus according to the present invention. FIG. 2 is an explanatory diagram illustrating a configuration of a carriage that reads a document image in the apparatus of FIG. 1. It is explanatory drawing (1st Embodiment) of the light source mechanism in the apparatus of FIG. 2, (b) is explanatory drawing which shows the state which expanded a part of (a). The block diagram of the light source mechanism different from FIG. 3 is shown, (a) shows the layout structure of a light source, (b) is the principal part enlarged view of (a). (Second Embodiment) The block diagram of the light source mechanism different from FIG.3 and FIG.4 (3rd Embodiment). The block diagram of the light source mechanism different from FIG. 3 thru | or FIG. 5 (4th Embodiment). The block diagram of the light source mechanism different from FIG. 3 thru | or FIG. 6 (5th Embodiment). FIG. 8 is a configuration diagram of a light source mechanism and a mirror different from those in FIGS. 3 to 7 (sixth embodiment). FIG. 2 is an external perspective view of a carriage in the apparatus of FIG. 1. Explanatory drawing of the light source concerning this invention It is explanatory drawing which shows the arrangement structure of the light-emitting body of the light source shown in FIG. 11, (a) is a case where a light-emitting body is comprised with two light emitting diodes, (b) (c) is a light-emitting body with three light emitting diodes. (D) (e) shows the case where a light-emitting body is comprised with four light emitting diodes, respectively. It is a block diagram which shows the control structure in the apparatus of FIG. (A) And (b) is explanatory drawing which shows the prior art example of a light source mechanism.

  The present invention will be described in detail below based on the preferred embodiments shown in the drawings. FIG. 1 shows an image reading apparatus having a light source structure according to the present invention. This apparatus includes an image reading apparatus A and a document feeding apparatus B mounted on the image reading apparatus A. Hereinafter, the image reading apparatus A and the document feeding apparatus B will be described in this order.

[Image reading device]
An image reading apparatus A according to the present invention includes a first platen 2 and a second platen 3 in an apparatus housing 1 as shown in FIG. The first and second platens 2 and 3 are made of a transparent material such as glass and are fixed to the top of the apparatus housing 1. The first platen 2 is formed to have a size size for placing and setting the document, and the second platen 3 is formed to have a width size so as to read the document moving at a predetermined speed. The second platen 3 is equipped with a document feeder B which will be described later. As shown in FIG. 1, the first and second platens 2 and 3 are juxtaposed with each other, and an image reading mechanism is built in the apparatus housing 1.

  The image reading mechanism will be described with reference to FIG. 2 (an enlarged view of the main part of FIG. 1). An optical carriage (hereinafter simply referred to as “carriage”) 6 is disposed in the apparatus housing 1, and can move between the first platen 2 and the second platen 3 at the same time as reciprocating along the first platen 2. It is configured. The carriage 6 is supported by a guide rail 12 with a bearing 11 made of a heat-resistant resin.

  The unit frame 11 of the carriage 6 includes a light source 9 (first light source 9a and second light source 9b described later) and a reflection mirror 10 (first mirror 10a, second mirror 10b, third lens) that deflects reflected light from the document. A mirror 10c, a fourth mirror 10d, and a fifth mirror 10e), a condensing lens 7 that condenses the light from the reflecting mirror 10e, and a line sensor 8 that is disposed in an image forming unit that forms an image with the condensing lens 7. And are installed. In the line sensor 8, the upper limit of sensitivity is set in accordance with the maximum amount of light from the second light source 9b. That is, the maximum light amount of the second light source 9b is the maximum light amount incident on the line sensor 8, and the light amount exceeding this is set so as not to enter. The image data output as an electrical signal from the line sensor 8 is electrically connected to the image processing unit 55 by a data transfer cable so as to transfer the image data to the image processing unit.

[Carriage configuration]
The carriage 6 is supported by a guide rail 12 disposed in the apparatus frame so as to reciprocate along the guide rail 12. The carriage 6 is connected to a carriage motor (not shown) via a winding member such as a wire, and reciprocates in the left-right direction in FIG. The pair of left and right guide rails 12 are arranged in parallel with the first platen 2 and are configured to reciprocate the carriage 6.

  As shown in FIG. 2, the first platen 2 and the second platen 3 are arranged on substantially the same plane, and the carriage 6 positioned below the first platen 2 and the second platen 3 is a guide rail so that the position of the carriage 6 can be moved directly below the first platen 2 and the second platen 3. 12 is selectively moved between the first platen 2 and the second platen 3 by a carriage motor (not shown). As the carriage 6 moves along the first platen 2, the original set on the first platen 2 is scanned and an image is read by the line sensor 8. At the same time, the carriage 6 moves from the first platen 2 to directly below the second platen 3, and is configured to read an image of a document moving at a predetermined speed on the second platen while being stationary at this position. .

  The carriage 6 is equipped with a light source 9 (9a, 9b), which will be described later, and a reflection mirror 10 for deflecting reflected light of light emitted from the light source 9 in a predetermined reading optical path direction. The apparatus shown in FIG. 2 deflects reflected light from the reading surface R (first platen side R1, second platen side R2) by the first mirror 10a and guides the light to the second mirror 10b and the third mirror 10c. The optical path is formed in this order from the third mirror 10c to the second mirror 10b, the fourth mirror 10d, and the fifth mirror 10e. The light from the fifth mirror 10 e is imaged on the line sensor 8 by the condenser lens 7.

  The condenser lens 7 is composed of one or a plurality of lenses, and constitutes a convex lens as a whole. The line sensor 8 is composed of a photoelectric conversion element such as a CCD, and the illustrated one is composed of an RGB color sensor array. In the present invention, the condensing lens 7 and the line sensor 8 are shown mounted on the carriage 6, but they may be disposed on, for example, the bottom chassis of the apparatus housing 1. In addition, the carriage 6 may be composed of first and second carriages, a light source and a reflecting mirror are mounted on the first carriage, and a condenser lens and a line sensor are mounted on the second carriage.

[Configuration of reflection mirror]
As described above, the carriage 6 includes the reflection mirror 10 composed of a plurality of reflection mirrors (the first mirror 10a to the fifth mirror 10e in the drawing), which are fixed to the unit frame 11, respectively.

  The reflection mirror 10a is made of a transparent substrate such as transparent glass or transparent plastic, and is formed of a flat plate-like substrate. On the surface thereof, a coated surface 10x for specularly reflecting light and an uncoated surface 10y for transmitting light are formed. ing. That is, a metal film such as aluminum is formed on a part of the surface of a translucent substrate (base material) such as glass by vacuum deposition or the like to provide the coating surface 10x. This surface is provided with an uncoated surface that is not coated with a metal film.

  The first reflecting mirror 10a has a coating surface 10x formed in the lower half and an uncoated surface 10y formed in the upper half. When light is irradiated from the second light source 9b (21) to the end surface 10z adjacent to the non-coating surface 10y, there is a possibility that the light is diffusely reflected at the end surface and the light directly enters the reading optical path Hr.

[Configuration of Light Source: First Embodiment]
A light source 9 (9a, 9b) for irradiating the reading surface R with linear light is mounted on the carriage 6. The light source of the present invention irradiates light from two directions with different angles with respect to the reading surface R.
The basic configuration of the present invention will be described below based on the embodiment shown in FIG. FIG. 3 is an explanatory diagram of a reading mechanism that models the image reading apparatus according to the present invention, and shows a case where the reading surface is read in line order. In FIG. 6A, a coating surface 10x and an uncoated surface 10y are formed on a first reflecting mirror 10a that first redirects the reflected light reflected from the reading surface R, and a second surface is formed on the back surface of the non-coated surface 10y. Embodiment (1st Embodiment) which arrange | positions the light source 9b is shown. FIG. 4B is an enlarged explanatory view of a main part showing an optical path of light passing from the second light source 9b to the first reflecting mirror 10a.

  The illustrated image reading mechanism includes a “reading surface”, a “light source”, and a “reading optical path”. The reading surface R is formed on a platen 2 (3) described later, and this reading surface R is usually the surface of the original sheet. Hereinafter, for convenience of explanation, a part of the platen 2 (3) is referred to as a reading surface R, which is synonymous with the reading surface of the original sheet. The platen is formed on a flat surface with a transparent material such as glass, and the flat bed type platen 2 is formed on a plane having a maximum document size. The document through platen 3 is formed to have a maximum document width size (dimension in the main scanning direction) and a width of several lines (dimension in the sub scanning direction).

  The light source 9 is disposed to face the reading surface R, and includes a first light source 9a and a second light source 9b. The first light source 9a is configured by a lamp that irradiates linear light at a predetermined incident angle θ1 with respect to the normal line n of the reading surface, and the second light source 9b has an incident angle θ2 smaller than the incident angle θ1 with respect to the normal line n. It consists of a lamp that irradiates with linear light. The first and second light sources 9a and 9b are fluorescent lamps (cold cathode fluorescent lamps), xenon lamps, LED arrays, and the like, and are configured with linear light in the main scanning direction. As long as the first and second light sources 9a and 9b in the present invention are configured to irradiate linear light having a width wider than the reading width in the main scanning direction, various lamp structures can be employed.

  The first light source 9a is arranged at an incident angle θ1 so that the reading surface R is irradiated with diffused light from an obliquely inclined direction. The first light source does not necessarily need to have two light emitters, one having an incident angle + θ1 and the other having an incident angle −θ1. However, it is preferable to arrange them symmetrically as shown in the figure, since the light is evenly irradiated without any spots. The second light source 9b is arranged so that the reading surface R is irradiated with light at an incident angle θ2 smaller than the incident angle θ1. Similarly to the first light source 9a, the second light source 9b is composed of linear light.

  In the reading optical path H, the reflecting mirror 10 (10a to 10c), the condenser lens 7 and the line sensor 8 constitute a reduced reading optical system. The first reflecting mirror 10a is arranged so that the angle θ2 is an optical path from the reading surface R, and the light is guided from this mirror to the condenser lens 7 through the second and third mirrors 10b and 10c. A line sensor 8 is arranged at the image position. The line sensor 8 has a device mounted on a sensor substrate 8 a supported by the unit frame 11.

  The condensing lens 7 and the sensor substrate 8a are configured to be position-adjustable. The condensing lens 7 is attached to the unit frame 11 so as to be position-adjustable in the optical path direction, and the focal position can be adjusted. The sensor substrate 8a is configured to be adjustable in height with respect to the unit frame 11.

  Therefore, the present invention “makes the reading optical path at the time of reading the first light source and the reading optical path at the time of reading the second light source a common optical path”, and “disposes the second light source 9b on the back surface of the first reflecting mirror 10a. And “the irradiation angle θ2 of the second light source 9b and the optical path angle θ3 of the reading light are arranged at the same angular position with respect to the reading surface R”.

  The reading optical path for reading the first light source and the reading optical path for reading the second light source are configured by a common optical path Hr. This is a natural configuration, and reading light of the first and second light sources 9a and 9b irradiated from different angles is read by an optical path in which the reflection mirror 10, the condensing lens 7 and the sensor substrate 8a are arranged. At this time, conventionally, as shown in FIG. 13 (a), the first reflection mirror is formed of a half mirror to guide light from both light sources to a common optical path. When passing through this half mirror, the amount of light from the light source is halved.

  In the present invention, the first reflecting mirror 10a is configured by a mirror-reflecting coating surface 10x and a light-transmitting non-coating surface 10y, and a second light source 9b is disposed on the back surface of the non-coating surface 10y. This makes it possible to arrange the center line light of the light irradiating the reading surface R and the reading optical path from the reading surface at close positions. If the irradiation angle θ2 from the second light source 9b is substantially close to zero, the reading surface R is approximated to being read from the normal direction.

  Then, with respect to the reading surface R, the irradiation angle θ2 of the second light source 9b and the optical path angle θ3 of the reading light are set to the same angular position. As a result, the maximum amount of light from the second light source 9b is directed to the reading optical path Hr, and the amplification value of the amplifier circuit of the sensor substrate 8a is set based on this maximum amount of light. That is, the reading upper limit sensitivity of the sensor substrate is set based on the light from the second light source 9b used for gloss reading. Such a configuration can solve the problem that the photoelectric sensor (line sensor) 8 is saturated.

  In the embodiment of FIG. 3, the coating surface 10 x and the non-coating surface 10 y are formed on the first reflection mirror 10 a that first deflects the reflected light from the reading surface R in the reading optical path direction. A second light source 9b is disposed on the back surface (lower side in FIG. 3) of the non-coating surface 10y, and a reading optical path and a condensing lens are disposed below the second light source 9b. The first reflecting mirror 10a is made of a material having a higher refractive index than air, such as glass or synthetic resin.

  With this configuration, as shown in FIG. 3B, the light from the light source is refracted at an angle γ, enters the mirror, is similarly refracted, and exits from the mirror into the air. The second light source is arranged at the position indicated by the solid line in the figure, but the position indicated by the broken line is the virtual light source. Therefore, by configuring the mirror 10a with a material having a refractive index larger than that of air, the second light source 9b disposed on the back surface of the mirror 10a can be moved away from the condensing lens or the like in the reading optical path. The layout of the second light source 9b is facilitated by utilizing the refraction of the passing light by the uncoated surface 10y.

[Second Embodiment]
Next, a modification of the light source mechanism in the first embodiment described above will be described with reference to FIGS. The linear light Hp1 is incident on the reading surface R of the first second platens 2 and 3 from the first light source 9a at the illustrated angle θ1, and the linear light Hp2 is incident from the second light source 9b at the illustrated angle θ2. A light source is arranged, the irradiation angle θ1 is set to a predetermined angle, and θ2 is set to an angle smaller than the irradiation angle θ1.

  The illustrated angles θ1 and θ2 indicate angles with respect to the normal line from the platen surface, and a reading light path (reflected light guided from the reading surface R to the reflecting mirror 10a; hereinafter the same) Hr is formed in the normal direction. In the illustrated apparatus, the first light source 9a is composed of a pair of two light emitters 20. This is for securing the amount of light irradiated onto the reading surface R, and the first light source 9a is not necessarily composed of a pair of light emitters, for example, one fluorescent lamp or one light emitter (LED array or the like). You may comprise.

  Therefore, the angle θ1 between the first light source 9a and the reading optical path Hr and the angle θ2 between the second light source 9b and the reading optical path Hr are set as follows. The angle θ1 is set in a direction inclined from the reading surface R so that the diffused light from the first light source 9a forms the reading optical path Hr. Therefore, the angle θ1 is set according to the layout structure such as the mounting space of the first light source 9a (the illustrated one is a pair of left and right).

  That is, the first light source 9a is positioned close to the reading surface R, and the incident angle θ1 is determined by the arrangement space such as the light source lamp. The diffused light from the first light source 9a is irradiated onto the reading surface R, and the reflected light is reflected on the reflection mirror (first mirror) 10a arranged in the normal direction of the reading surface R by the unevenness (surface roughness) of the original sheet. (Reading light) is incident.

  The angle θ2 of the second light source 9b (second light emitter 21 described later) is set according to the surface roughness of the glossy document. When this surface is a completely smooth surface, it is necessary to set θ2 = 0 °, but there is no completely smooth surface. Therefore, the present inventor conducted an experiment on a glossy original having the closest perfect smooth surface and found that the angle of 3 degrees or less was suitable for the apparatus shown in FIG.

  With such a setting, the angle θ1> the angle θ2 is normally satisfied, and the angle θ2 has an allowable maximum angle determined according to the glossiness (surface roughness) of the read document (within 3 degrees in the apparatus of FIG. 1) and exceeds this. Blackout phenomenon occurs. 4A and 4B show the layout structure of the second light source 9b (21).

  The first light source 9a (20) of the carriage 6 is configured to irradiate diffused light from either the left or right direction or both the left and right directions from the direction inclined by the angle θ1 at a position close to the reading surface R of the first and second platens 2 and 3. It is arranged on the unit frame 11. On the other hand, the second light source 9b is disposed on the back surface of the first mirror 10a that polarizes the reflected light (reading optical path Hr) from the reading surface R in a predetermined direction. The embodiment shown in FIG. 4 is configured to reflect the light from the second light source 9b by the reflector 18 and irradiate the reading surface R with the filament light Hp2. The filament light Hp2 is disposed so as to enter the reading surface R at the aforementioned angle θ2.

  In the embodiment shown in FIG. 4, a coating surface 10x and a non-coating surface 10y are formed on the first reflection mirror 10a that first reflects the reflected light (reading optical path Hr) from the reading surface R, and the reflecting mirror 10a has the reading optical path Hr. It is arranged to be inclined at a predetermined angle (angle α shown in FIG. 4B) with respect to (the normal direction of the reading surface R). In this state, the coating surface 10x is arranged in the lower half (position far from the reading surface R), and the non-coating surface 10y is arranged in the upper half (position close to the reading surface R).

  The light from the second light source 9b passes through the non-coating surface 10y between the end surface 10z (see FIG. 4B) of the reflecting mirror 10a and the coating surface 10x formed in the lower half. Yes. Thus, the scattered light from the second light source 9b is formed by forming the coating surface 10x on the lower half of the reflecting mirror 10a inclined by a predetermined angle (α) and the non-coating surface 10y on the upper half (FIG. 4B). Does not enter the reading optical path Hr and cause a flare phenomenon. Accordingly, the coating surface 10x prevents the scattered light from the second light source 9b from entering the line sensor 8 directly.

  Further, the light from the second light source 9b is configured to pass between the end face 10z of the reflection mirror 10a and the coating face 10x. This is to prevent scattered light from being generated at this portion when the light from the second light source 9b is applied to the end face 10z and entering the reading optical path Hr.

  In the embodiment of the second light source 9b and the reflection mirror 10a described above, the case where the light from the second light source 9b is collected by the reflector 18 and the light transmitted through the reflection mirror 10a is irradiated to the reading surface R is shown. Alternatively, the reading surface R may be directly irradiated with light from the second light source 9b without arranging the reflector 18.

[Third Embodiment]
Next, a modification of the first embodiment described above will be described with reference to FIG. FIG. 5 shows an improvement of the end face structure of the first reflecting mirror 10a described above. The first reflecting mirror 10a has a coating surface 10x formed in the lower half and an uncoated surface 10y formed in the upper half. When light is irradiated from the second light source 9b (21) to the end surface 10z adjacent to the non-coating surface 10y, there is a possibility that the light is diffusely reflected at the end surface and the light directly enters the reading optical path Hr. Therefore, the end surface 10z of the first reflecting mirror 10a shown in FIG. 5 is chamfered so as to be substantially parallel to the reading surface R (platen surface). Thereby, the light irregularly reflected by the end face 10z does not directly enter the reading optical path Hr.

[Fourth Embodiment]
In the above-described embodiment, the case where the second light source 9b is arranged on the back surface of the first mirror (first reflection mirror) 10a that first deflects the reflected light from the reading surface R is shown. The second light source 9b can also be disposed on the back surface of a second mirror (second reflection mirror) 10b disposed to face the first mirror 10a.

  In FIG. 6, the case where the 2nd light source 9b is arrange | positioned on the back surface of the 2nd reflective mirror 10b is shown. A second reflecting mirror 10b is disposed at a position facing the first reflecting mirror 10a that first receives reflected light from the reading surface R, and deflects light from the first reflecting mirror 10a toward a predetermined reading optical path Hr. The second reflecting mirror 10b is composed of a flat substrate made of a light-transmitting material such as transparent glass or transparent plastics, and has a coating surface 10x for specularly reflecting light on its surface and an uncoated surface 10y for transmitting light. Is formed. The coating surface 10x is formed by vacuum deposition or the like of a metal film such as aluminum on a part of the surface of a translucent substrate (base material) such as glass.

  The second reflection mirror 10b is disposed at a predetermined angle with respect to the normal direction of the reading surface R so as to face the first reflection mirror 10a. In this state, the coating surface 10x is arranged in the lower half (position far from the reading surface R), and the non-coating surface 10y is arranged in the upper half (position close to the reading surface R).

  The second light source 9b is disposed on the back side of the non-coated surface 10y, and the light passes through the non-coated surface 10y and enters the first reflecting mirror 10a. The filament light Hp2 incident on the first reflecting mirror 10a irradiates the reading surface R. With this configuration, the incident angle θ2 of the line light Hp2 from the second light source 9b (21) that irradiates the reading surface R can be set within a predetermined angle (for example, 3 degrees).

[Fifth Embodiment]
In the second embodiment described above, when the light from the second light source 9b (21) is irradiated onto the reading surface R by the reflector 18, the reflector 18 is configured by a member (part) different from the first reflecting mirror 10a. Yes. The reflector 18 may be formed integrally with the first reflecting mirror 10a, and its form is shown in FIG.

  On the surface of the first reflecting mirror 10a, a coating surface 10x is formed in the lower half and an uncoated surface 10y is formed in the upper half. Therefore, a reflection sheet 10w is attached to the upper half of the back surface of the first reflection mirror 10a. The reflection sheet 10w is provided with a reflection surface formed in a Fresnel lens shape, for example.

  Then, the light reflected by the coating surface 10x formed in the lower half of the first reflecting mirror 10a is polarized by the reflecting surface and irradiated to the reading surface R from the non-coating surface 10y. And it arrange | positions so that light may be irradiated to the back surface of the coating surface 10x from the 2nd light source 9b. Other configurations are the same as those of the first embodiment, and the same reference numerals are given and description thereof is omitted.

  In the first embodiment described above, the case where the coating surface 10x is formed in the lower half portion and the non-coating surface 10y is formed in the upper half portion on the surface of the first reflecting mirror 10a is shown. In this case, if the glossiness (smoothness) of the document surface is higher, the image may not be read. Similarly, when the first reflecting mirror 10a is disposed at a position close to the reading surface R, light may be emitted from an angle exceeding 3 degrees as described above.

[Sixth Embodiment]
Next, different examples of the arrangement of the light source mechanism and the mirror of the first embodiment described above will be described with reference to FIG. Since the incident angle to the reading surface R of the first light source 9a and the second light source 9b and the angle of the reading light Hr are the same as those in the above-described embodiment, description thereof will be omitted.

  The pair of first light sources 9a is housed in a holder 60 that extends in the main scanning direction. The holder 60 has a pair of concave light source accommodating portions extending in the main scanning direction, and accommodates the pair of first light sources 9a in the concave portions. Further, an opening for allowing reading light to pass through is provided between the pair of light source housings. The holder 60 is fixed to the unit frame 11 of the carriage 6 via a holder support member 61 formed of a rigid member. The holder 60 has an opening that allows light from the reading surface R to pass between the pair of light source accommodation portions.

  At this time, the first light source 9a includes a fluorescent lamp (cold cathode tube) having a predetermined length, a xenon lamp, an LED light emitting element, a light guide, and the like, but is not limited thereto. At this time, since the second light source 9b is disposed on the back surface of the first reflection mirror 10a, it is necessary to bring the first reflection mirror 10a close to the reading surface R and to secure a space for arranging the second light source 9b.

  The holder 60 has a notch on the bottom surface of the accommodating portion on the second light source 9b side. At this notch portion, a virtual line obtained by extending the bottom surface of the holder 60 in a direction perpendicular to the normal line n of the reading surface R, and the opening side surface of the holder 60 on the second light source 9b side is defined as a normal line n of the reading surface R. An extension line extending in the horizontal direction is a dotted line shown in FIG. In the present embodiment, the first reflecting mirror 10a is arranged such that a part of the non-coating surface and the corner portion on the non-coating surface side enter the region partitioned by the dotted line.

  Since the non-coated surface is transparent, it transmits light. Thereby, the light from the second light source 9b, the irregularly reflected light from the reading surface R, the irregularly reflected light from the side surface of the opening of the holder 60, external light, etc. may cause irregular reflection on the non-coating surface. Furthermore, there is a possibility that light is repeatedly reflected inside the transparent plate. Accordingly, it is assumed that light that is not originally reading light enters the reading optical path and affects the reading result.

  At this time, according to the present embodiment, a part of the non-coating surface and a corner portion on the non-coating surface side are covered with the notch portion of the holder 60. Even if irregularly reflected light is generated, it is possible to prevent light from being blocked by the notch portion of the holder 60 and affecting the reading result. Furthermore, the first reflection mirror 10a can be brought close to the reading surface R, and a space for arranging the second light source 9b can be secured.

[Configuration of luminous body]
The first light source 9a (20) and the second light source 9b (21) described above irradiate the reading surface R with the linear light beams Hp1 and Hp2 from two different directions. Then, diffused light is emitted from the first light source 9a (20) at an irradiation angle θ1, and specularly reflected light (light that is close to specularly reflected light) is emitted from the second light source 9b (21) at an irradiation angle θ2 to the reading optical path Hr. In order to be guided, θ1> θ2 is set, and the angle θ2 is arranged at a position close to the reading optical path Hr.

  Therefore, the light emission amount of the first light source 9a (20) is configured to be larger than the light emission amount of the second light source 9b (21). This is because, when the glossiness of the document is high, much of the irradiated light is reflected in the regular reflection direction. For this reason, a larger amount of light is incident on the CCD than in the diffuse reflection reading, and the CCD may be saturated. In order to prevent this, the light emission amount of the first light source 9a used for diffusion reading is made larger than the light emission amount of the second light source 9b used for gloss reading.

  Therefore, the first light source 9a and the second light source 9b are configured to irradiate the reading surface R with linear light in the main scanning direction orthogonal to the horizontal direction in FIG. For this reason, the first light source 9a and the second light source 9b are configured by a fluorescent lamp (cold cathode tube), an LED array, a xenon lamp, or the like having a predetermined length. FIG. 9 shows a configuration in which the light source 9 is mounted on the carriage 6. The carriage 6 described above is provided with a light source accommodating portion (light guide support frame) 13, and the accommodating portion 13 is configured at two locations, a first accommodating portion 13 a and a second accommodating portion 13 b.

  The light source accommodating portion 13 accommodates a first light source 9a and a second light source 9b, and includes a light guide 30, a first light emitter 20 (first light source), and a second light emitter 21 (second light source), respectively. Has been. Since this 1st light source 9a and the 2nd light source 9b are the same structures, the same code | symbol is attached | subjected and the structure is demonstrated about the 1st light source 9a.

  As shown in FIG. 10, the light guide 30 is composed of a rod-shaped light transmitting member having a length corresponding to the reading width (reading line width) W of the reading surface R. The light guide 30 is made of a material having high translucency such as transparent acrylic resin and epoxy resin, and its cross-sectional shape is rectangular or fan-shaped as shown in the figure, and is formed on the left and right end surfaces 31L and 31R. The first light emitter 20 is disposed. The light guide 30 has a light scattering surface 32 and a light emitting surface 33 disposed so as to face each other.

  As described above, the light scattering surface 32 and the light emitting surface 33 are arranged to face each other with a length of the reading line width W substantially in parallel with a distance Ld. The light scattering surface 32 is subjected to surface processing so as to diffusely reflect the light that is formed on the concavo-convex surface by painting, etching, molding or the like. Further, the light emitting surface 33 is surface-finished like a lens surface with high translucency.

  Therefore, the light introduced into the light guide 30 is diffused in a predetermined direction by the light scattering surface 32, and the light introduced into the light emitting surface 33 is reflected inside when the angle is equal to or larger than a predetermined critical angle, and when the angle is equal to or smaller than the critical angle. It is emitted to the outside. The light indicated by the arrow ha in FIG. 10 is reflected in the light guide 30 and dispersed in the reading line width W direction, and the light indicated by the arrow hb is emitted from the light emitting surface 33 to the reading surface R. Although not shown, light is incident on the light emitting surface 32 and the light emitting surface 33 from a second light emitter 21 described later in a spherical direction (360-degree direction; the illustrated one is a 60-degree wide-angle direction).

  Thus, the first light emitter 20 will be described. The first light emitter 20 is disposed on at least one end surface of the light guide 30. FIG. 10 shows a case where the light source is disposed on the left end surface 31L and the right end surface 31R, and the light sources on the left and right end surfaces are configured to be left and right symmetrical. Although not shown, the first light emitter 20 is disposed on one of the left and right end surfaces, and a reflection mirror (mirror member) is disposed on the other. The reflection mirror at this time is configured so that the virtual light source is symmetrical with the first light emitter 20.

[Arrangement of light emitters]
The first light emitter 20 is composed of at least two light emitters 41, 42, composed of three light emitters 41, 42, 43, composed of light emitters 41, 42a, 42b, or four light emitters 41, 42, 43a, 43b, light emitters 41a, 41b, 42a, 42b, or five light emitters 41, 42a, 42b, 43a, 43b.

  In this case, the light emitting body 41 and the light emitting body 42 enter light from the left end surface 31L of the light guide 30 from different positions between the light scattering surface 32 and the light emitting surface 33. At the same time, the illuminant 41 and the illuminant 42 are arranged at a distance from each other in the emission optical path direction (indicated by an arrow hx in FIG. 10) from the light emission surface 33 toward the reading surface R.

  That is, the light emitter 41 is arranged at a distance Ld1 and the light emitter 42 is arranged at a distance Ld2 (Ld1 <Ld2) with respect to the scattering surface 32. The outgoing light path direction hx of the illustrated light guide 30 is configured to coincide with the normal direction of the light scattering surface 32. And each light-emitting body 41,42,43 is comprised by the planar light emitting element, and is comprised by white LED.

  FIG. 11A shows a layout structure (first embodiment) in which the first light emitter 20 is composed of two light emitting elements, a light emitter 41 and a light emitter 42. A light emitter 41 and a light emitter 42 are arranged along the normal line (outgoing light path direction) hx of the light scattering surface 32. The light emitter 41 is disposed at a distance Ld1 from the light scattering surface 32, and the light emitter 42 is disposed at a distance Ld2. An offset amount dx is formed between the light emitters 41 and 42.

  As described above, the light scattering surface 32 is formed in a band shape along the reading line, and the emission direction is set in a direction orthogonal to the center (1/2 of the sub-scanning direction). The light emitters 41 and 42 are arranged on this normal line.

  FIG. 11B shows a layout structure (second embodiment) in which the first light emitter 20 is composed of three light emitting elements of a light emitter 41, a light emitter 42, and a light emitter 43. The light emitter 41 is disposed at a distance Ld1 from the light scattering surface 32, the light emitter 42 is disposed at a distance Ld2, and the light emitter 43 is disposed at a distance Ld3. An offset amount dx is formed between the light emitters. This embodiment is also arranged on the normal line (exit optical path direction) hx described above.

  FIG. 11C shows a layout structure (third embodiment) in which the first light emitter 20 is composed of a light emitter 41 and a light emitter 42, and the light emitter 42 is composed of two light emitting elements 42a and 42b. The light emitter 41 is disposed at a distance Ld1 from the light scattering surface 32, and the light emitters 42a and 42b are both disposed at a distance Ld2 from the light scattering surface 32. The light emitters 42a and 42b adjacent to the light emitting surface 33 are arranged at positions symmetrical with respect to the normal hx.

  In this embodiment, the light emitter 42 arranged at a position close to the light emitting surface 33 is constituted by two light emitting elements 42a and 42b, and these two light emitting elements are symmetrical with respect to the outgoing light path direction (normal line) hx. It is characterized by arranging.

  FIG. 11D shows a layout structure in which the first light emitter 20 is composed of a light emitter 41, a light emitter 42, and a light emitter 43, and the light emitter 43 is composed of two light emitting elements 43a and 43b (fourth embodiment). Indicates. The light emitter 41 is disposed at a distance Ld1 position from the light scattering surface 32, the light emitter 42 is disposed at a distance Ld2 position, and the light emitter 43 is disposed at a distance Ld3 position. The light emitting body 41 and the light emitting body 42 are arranged on the normal line hx, and the light emitting elements 43a and 43b of the light emitting body 43 are arranged at positions symmetrical with respect to the normal line hx.

  In this embodiment, the light emitting body 43 arranged at a position close to the light emitting surface 33 is constituted by two light emitting elements 43a and 43b, and these two light emitting elements are symmetrical with respect to the outgoing light path direction (normal line) hx. It is characterized by arranging.

  In FIG. 11E, the first light emitter 20 is composed of a light emitter 41 and a light emitter 42. The light emitter 41 is composed of two light emitting elements 41a and 41b, and the light emitter 42 is composed of two light emitting elements 42a and 42b. The layout structure which comprises is shown. The two light emitting elements constituting the light emitters 41 and 42 are arranged at positions symmetrical with respect to the normal line hx.

  In FIG. 11F, the first light emitter 20 is composed of a light emitter 41, a light emitter 42, and a light emitter 43, the light emitter 42 is composed of two light emitting elements 42a and 42b, and the light emitter 43 is composed of two light emitting elements. The layout structure (6th Embodiment) comprised by element 43a, 43b is shown. The light emitter 41 is disposed at a distance Ld1 position from the light scattering surface 32, the light emitter 42 is disposed at a distance Ld2 position, and the light emitter 43 is disposed at a distance Ld3 position. The light emitting body 41 and the light emitting body 42 are arranged on the normal line hx, and the light emitting elements 43a and 43b of the light emitting body 43 are arranged at positions symmetrical with respect to the normal line hx.

  In this embodiment, the light emitting body 41 arranged at a position close to the light scattering surface 32 is one light emitting element, and the light emitting body 43 arranged at a position close to the light emitting surface 33 is two light emitting elements, The light emitter 42 disposed at a position close to the light emitter 41 and the light emitter 43 is composed of two light emitting elements, and the two light emitting elements constituting the light emitter 42 and the light emitter 43 are represented by a normal line hx. It is characterized by being arranged symmetrically in the center.

  The light emitter 40 in the above-described embodiment is an embodiment in which the light emitters 30 are disposed at both ends of the light guide 30 as shown in FIG. 10, but either one of the light emitters as described above. Instead of 40, a reflection mirror (mirror member) may be arranged, and a virtual light source equivalent to the light emitter 40 may be configured by this reflection mirror. At this time, the right end surface 31R may be inclined by a predetermined angle.

  As described above, the light source incident on the light guide 30 is composed of a plurality of light emitters having substantially the same wavelength, and the incident position from the light emitter 41 and the incident position from the light emitter 42 are the light guide 30. Are set at positions separated by a distance in the outgoing light path direction (normal direction of the light scattering surface) hx. In this way, by arranging two or more light emitters at a distance in the direction of the outgoing light path, the linear light from the light guide 30 toward the reading surface R is matched (complementary) with the characteristics of the condenser lens. Is possible.

[Circuit board mounting structure]
Therefore, the present invention is characterized in that the light source 9 described above is attached to the carriage 6 as follows. As described above, the light guide 30 constituting the light source 9 is mounted on the light source housing portion 13 of the carriage 6, and the heat dissipation member 14 is integrally formed on the unit frame 11 of the carriage 6. The heat dissipating member 14 is made of a metal material having a high thermal conductivity such as an aluminum alloy, and heat dissipating fins 14f are provided around it (see FIG. 9). The circuit board 16 is fixed to the heat radiating member 14.

  A resin plate 15 is disposed between the circuit board 16 and the board mounting portion 14a, and the resin plate 15 is made of an insulating synthetic resin rich in elasticity. Therefore, the circuit board 16 is fixed by the fixing plate 17 with the resin plate 15 interposed in the board mounting portion 14a.

[Light source control configuration]
The control of the light source 9 will be described with reference to FIG. 2. The first light source 9a (first light emitter 20) and the second light source 9b (second light emitter 21) have the first platen 2 and the second plate 2 as shown in FIG. Light is applied to the reading surface R of the platen 3. In this case, the first light source 9a is not necessarily composed of two light sources as shown, and may be composed of one light source or three or more light sources. The illustrated first light source 9a is composed of two light emitters because the speed of the document traveling on the second platen 3 by the document feeder B, which will be described later, is greater than the speed at which the carriage 6 moves along the first platen 2. Fast. That is, the reading speed of the second platen 3 is higher than the reading speed of the first platen 2. For this reason, it is preferable to make the light quantity of the first light source 9 a irradiating the original higher than that of the first platen 2.

  Such light amount adjustment is possible by adopting one of the following methods. (1) The level of power supplied to the light source 9 mounted on the carriage 6 is adjusted. For example, a power supply circuit that supplies power to the first light source 9 is provided with a supply voltage or supply current switching unit, and a light amount adjustment unit that adjusts the power supplied to the lamp. Since this light amount adjusting means is widely known as PWM control, its detailed description is omitted.

  In the next method, (2) light amount adjusting means for selectively lighting the first, second, and at least two light emitters mounted on the carriage 6 is provided. The apparatus shown in FIG. 2 has a first light guide 30a and a second light guide 30b mounted on the carriage 6, and supplies power to the first light guide 30a when irradiating the original on the first platen 2 with light. Then, when irradiating light on the original on the first platen 3 and irradiating light on the original on the second platen 2, power is supplied to the first light guide 30a and the second light guide 30b, and the second The document on the platen 2 is configured to irradiate light.

  In such a configuration, when the carriage 6 is positioned on the first platen 3, the first light guide 30a is turned on, and when the carriage 6 is positioned on the second platen 2, the first light guide 30a and the second light guide 30b are turned on. This makes it possible to adjust the amount of light applied to the document, and the switching circuit for turning the supply power “ON” and “OFF” constitutes the light amount adjusting means.

  Therefore, the first light source 9a and the second light source 9b turn on the first light source 9a and turn off the second light source 9b when reading a document on the first platen 2 and when reading a document traveling on the second platen 3. In this state, the image on the reading surface R is read, and then the image on the reading surface R is read with the second light source 9b turned on and the first light source 9a turned off. A glossy original image can be read by combining the two read data.

[Line sensor control configuration]
FIG. 12 shows a control configuration in the image reading apparatus of FIG. The image reading apparatus shown in FIG. 1 includes a reading operation control unit 50 that controls a scanning operation, and an output signal processing unit (CCD signal processing unit) 53. The reading operation control unit 50 includes a control CPU 50, and controls the power supply circuit 52 of the light source 9 (first light source 9a, second light source 9b) to control blinking of each light source lamp. At the same time, the control CPU 50 controls the carriage motor of the carriage 6 to scan the carriage 6. At the same time, the reading operation control unit 50 controls the driver circuit 51 of the line sensor 8. The illustrated driver circuit 51 controls the photoelectric conversion timing of the line sensor 8 which is a CCD device.

  The output signal processing unit 51 processes the signal output from the line sensor 8. The line sensor 8 is electrically connected to a signal processing unit 53. The signal processing unit 53 includes an amplifier circuit, an AD conversion circuit, a correction circuit (dither correction, γ correction, etc.) and an output memory (line memory) 54 from the I / O. It is connected to an external device (such as a computer) C via F. The timing of data transfer from the CCD signal processing unit 53 to the line memory 54 is controlled by the output signal processing unit 51, and the timing of data transfer from the line memory 54 to the external device C is a transfer command from the control CPU 50 and an external device (not shown). Controlled by signal.

  In such a configuration, the driver circuit 51 of the CCD line sensor 8 is composed of a timing generator. This timing generator is provided with an operation setting register, and is configured to be able to adjust the signal timing to be output by changing the register value. The register value of the timing generator is designated by the control CPU 50, and the reading time (output value transfer timing) of the CCD is set by this register value.

  The control of the light source 9 controls the power supply circuit 52 of the light source lamp. The illustrated light source 9 is composed of an LED light emitter, the driving power supply is pulse-controlled, and the control CPU 50 is configured to control the lighting time by PWM control of a pulse generator provided in the power supply circuit 52. Yes.

[Configuration of document feeder]
As shown in FIG. 1, the document feeder B is arranged above the first and second platens 2 and 3 so as to cover the first and second platens 2 and 3, and a read roller (document feeder) that feeds the document sheet to the second platen 3. Feeding means) 34 and a carry-out roller 22. Further, on the upstream side of the lead roller 34, a paper feed stacker 23 for stacking and storing document sheets, a paper feed roller 24 for stacking and feeding the sheets one by one on the paper feed stacker, and a separate feed. A registration roller pair 25 for correcting the skew of the front end of the sheet is disposed. 26 is a paper feed path for guiding a document sheet from the paper feed stacker 23 to the second platen 2, and S1 is a lead sensor for detecting the leading edge of the document reaching the platen.

  In the illustrated apparatus, a backup roller 27 for guiding the document sheet is disposed above the second platen 3. This backup roller 27 rotates at the same peripheral speed as the lead roller 34 so as to fit the original sheet on the second platen 3, and a backup guide may be disposed above the platen without providing this backup roller 27.

  A paper discharge roller 28 and a paper discharge stacker 29 are disposed on the downstream side of the carry-out roller 22. As shown in FIG. 1, the paper discharge stacker 29 is arranged vertically below the paper feed stacker 23, and a platen cover 5 for pressing and supporting the original sheet on the first platen 3 is provided at the bottom. Yes.

A image reading device 2 first platen 3 second platen 7 condenser lens 8 line sensor 9 light source 9a first light source 9b second light source 10 reflecting mirrors (10a to 10e)
10a First mirror (first reflection mirror)
10b Second reflecting mirror 10x Coated surface 10y Uncoated surface 20 First light emitter 21 Second light emitter 30 Light guide 31L Left end surface 31R Right end surface 32 Light scattering surface 33 Light emitting surface 41 Light emitters (41a, 41b)
42 Light emitters (42a, 42b)
43 Light emitters (43a, 43b)
50 CPU
51 Driver circuit (timing generator)
52 Power supply circuit 53 Output processing unit 54 Line memory 55 Image processing unit 60 Holder 61 Holder support member R Reading surface

Claims (9)

An apparatus for reading a glossy image with reflected light emitted from a plurality of light sources arranged in different angular directions on a reading surface,
A platen having a reading surface;
A first light source having a first light guide that irradiates the reading surface with linear light at a predetermined incident angle;
A second light source having a second light guide that irradiates the reading surface with linear light at an incident angle smaller than the predetermined incident angle;
A plurality of reflection mirrors for deflecting the specularly reflected light of the second light source and the irregularly reflected light of the first light source from the reading surface toward a common reading optical path;
A condensing lens that is arranged in the reading optical path and condenses the reading light from the reading surface at a predetermined imaging position;
A reading element substrate in which a photoelectric conversion element array is disposed at an imaging position of the condenser lens;
Lens position adjusting means for adjusting the position of the condenser lens in the reading optical path;
With
In the first light source, the second light source, and the plurality of reflection mirrors, the irradiation angle from the second light source is equal to the angle of the first reading light from the reading surface toward the reading optical path with reference to the normal line of the reading surface. The angle of the second reading light from the reading surface toward the reading optical path is smaller than the irradiation angle from the first light source with reference to the normal line of the reading surface, and the angle of the first reading light and the angle of the second reading light Are set to be equal,
One of the plurality of reflection mirrors is formed of a light-transmitting plate-like material having a coating surface that reflects light specularly on a surface and an uncoated surface that transmits light, and an end surface in contact with the non-coating surface is the reading surface Chamfered to be parallel to the
The first light guide is disposed between the platen and one mirror reflection surface side of the plurality of reflection mirrors,
The second light guide is disposed on the back side of one of the plurality of reflection mirrors so that the irradiation light passes through one uncoated surface of the plurality of reflection mirrors. Reader.   The image reading apparatus according to claim 1, wherein the translucent plate-like material having the non-coating surface is a material having a refractive index larger than that of air.   The image reading apparatus according to claim 1, wherein one of the plurality of reflection mirrors is a reflection mirror that first deflects reflected light from a reading surface in a reading optical path direction. The first light source is composed of two light emitters that irradiate linear light from two directions with respect to the reading surface,
The image reading apparatus according to claim 1, wherein the two light emitters are arranged at symmetrical positions for irradiating light at an equal angle to the reading surface. The amount of light emitted from the second light source to the reading surface is:
5. The image reading apparatus according to claim 1, wherein the image reading device is set to a light amount smaller than an irradiation light amount irradiated to the reading surface from the first light source.   6. The image according to claim 1, wherein the second light source includes a light emitting diode and a light guide that deflects light from the light emitting diode into linear light. 6. Reader. The reflection mirror is
A first reflecting mirror that first reflects reflected light from the reading surface;
A second reflection mirror that deflects light from the first reflection mirror in a predetermined reading optical path direction,
The coated surface and the non-coated surface are formed on the second reflecting mirror,
The second light source is disposed on the back surface of the second reflecting mirror,
The image reading apparatus according to claim 1, wherein the reading surface is irradiated via the first reflecting mirror.   8. The coating surface and the non-coating surface formed on the reflecting mirror are formed so that the non-coating surface is close to the reading surface and the coating surface is distant from the reading surface. The image reading apparatus according to any one of the above. The second light source disposed on the back surface of the reflecting mirror is
A light emitter;
A reflector that irradiates the non-coated surface with light from this illuminant;
The image reading apparatus according to claim 1, comprising:

Images