JPH0943746A - Image reading device - Google Patents

Abstract

(57) Abstract: A first original placed on a platen is read and scanned by a moving reading optical system, and is fed onto the platen.
In the image reading apparatus of the type that reads and scans the document with the reading optical system fixed, the apparatus is further downsized, and the weight and cost are reduced. A second original reading area F2 is set in a first original reading area F1, and a second original reading area F1 is set in a second original reading area F1.
The first background member 4 that covers the portion of the document other than the original reading area F2 and the second background member 1 that covers the second original reading area F2.
0 is provided, and when the first original is read, the first original is pressed against the platen 70 by the first and second background members 4 and 10, and the second original is read. When reading, it is characterized in that it is fed and moved into the second document reading area F2 between the platen 70 and the second background member 10 through the gap between the first and second background members 4 and 10. Further, the illuminating means 55 is arranged downstream of the reading position of the reading optical system 50 in the second document feeding movement direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading device applied to a copying machine, a facsimile, etc.

[0002]

2. Description of the Related Art Conventional image reading apparatuses of this type include:
For example, there is one disclosed in Japanese Patent Laid-Open No. 63-046867.

That is, a sheet original is provided on a platen having a first original reading area on which a first original such as a thick original is to be placed, and a second original reading area set at a predetermined position on the platen. And a document feeding means for feeding a second document such as.

When the first original is read, the original is placed in the first original reading area and the reading optical system is moved to read and scan the original image. On the other hand, when the second original is read, the reading optical system is fixed, and the second original is fed and moved to the second original reading area by the original feeding means to read and scan the original image. Has become.

In this conventional example, the second original reading area is provided outside the first original reading area, and the first original reading area and the second original reading area position the first original. It was divided by the ruler member for performing.

[0006]

However, in the case of the above-mentioned prior art, the image reading apparatus becomes large because the second original reading area is set outside the first original reading area, and for that reason. There was a drawback that increased costs.

[0007] The present invention has been made to solve the above-mentioned problems of the prior art.
An image reading apparatus of a system in which a first reading document placed on a platen is read and scanned by a moving reading optical system, and a second reading document fed on the platen is read and scanned with the reading optical system fixed. In order to further reduce the size of the device, the weight and cost of the device should be reduced.

[0008]

In order to achieve the above object, according to the present invention, a platen having a first original reading area on which a first original such as a thick original should be placed, A document feeding unit that feeds a second document such as a sheet document to a second document reading area defined at a predetermined position on the platen, and a document reading unit that reads the first and second documents on the platen. A reading optical system capable of reading and an illuminating unit that illuminates the surface of the original to be read by the reading optical system are provided, and when the first original is read, the original is placed in the first original reading area. Then, when the reading optical system is moved to read and scan the original image and the second original is read, the reading optical system is fixed and the original feeding means sets the second original reading area. The second original is fed and moved to read the original image. In the image reading apparatus for performing the above, the second original reading area is set in the first original reading area, and a portion of the first original reading area other than the second original reading area is covered. A first background member and a second background member that covers the second original reading area, and when the first original is read, the first original is placed on the first and second background members. When the second original is read by pressing on the platen with, the paper is fed into the second original reading area between the platen and the second background through the gap between the first and second background members. It is characterized by sending and moving.

When reading the first original,
The first document is pressed against the platen by the first background member and the second background member, and the reading optical system is moved to read and scan the document.

When reading the second original, the second original is fed to the second original reading area between the platen and the second background through the gap between the first and second background members, The reading scanning of the second document is performed by the fixed reading optical system.

It is preferable that the illuminating means is arranged downstream of the reading position of the reading optical system in the second document feeding and moving direction.

With this configuration, the first background member and the second background member
The boundary with the background member of is not read as a shadow,
A good image can be obtained even when reading a small-sized document.

Further, a ruler member for positioning the first original document is constructed so as to be capable of projecting and retracting with respect to the upper surface of the platen, and when the second original document is read, the ruler member is retracted from the upper surface of the platen so as to be retracted. When reading a document, it is preferable to project it on the upper surface of the platen.

With this configuration, the first original can be accurately positioned on the platen. On the other hand, when the second original is read, the ruler member is pulled in from the upper surface of the platen so that the feeding of the second original is not affected.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 shows an image reading apparatus according to an embodiment of the present invention.

That is, this image reading apparatus has a contact glass 70 as a platen having a first original reading area F1 on which a thick original as a first original should be placed.
And a second document reading area F2 defined at a predetermined position on the contact glass 70.
And an automatic document feeder 100 as a document feeding means for feeding a sheet document as a second document.

The first original reading area F1 is almost the entire surface of the contact glass 70, and the edge of the contact glass 70 has a ruler member 14 for positioning a thick original or the like.
Is provided.

On the other hand, below the contact glass 70,
A contact sensor 50 is provided as a reading optical system capable of reading thick originals and sheet originals on the contact glass 70.

The contact sensor 50 is moved left and right in FIG. 1 by a moving means (not shown) to read a thick original.

The second original reading area F2 is provided at the end of the contact glass 70 so as to overlap the first original reading area F1, and the contact sensor 50 is fixed at a position below the second original reading area F2. The automatic document feeder 100
The sheet document is fed and moved to the second document reading area F2 to read and scan the document image.

The automatic document feeder 100 functions as a pressure plate for pressing the upper surface of the contact glass 70, and can be opened and closed with the rear part as the center of rotation.

That is, the automatic document feeder 100 includes a sheet document table 1 on which a sheet document or the like is placed, a preliminary conveyance roller 5 and a pressing plate 6 for preliminarily conveying the sheet document, and a separation for separating the sheet documents one by one. The sheet original is prescribed in cooperation with the piece 7 and the separating roller 8, the pair of front conveying rollers 9 for feeding the sheet original at a prescribed speed, the white background 10 for reading the sheet original, and the conveying roller 13 arranged on the side of the reading device. And a pressure plate elastic member 3 for pressing a thick original and a pressure plate white background 4.

The sheet original reading white background 10 constitutes a first background member covering the second original reading area F2, and the platen white background 4 is the second original reading area in the first original reading area F1. A first background member that covers the area other than F2 is configured.

The sheet original sent from the sheet original table 1 passes through the front conveying roller pair 9 and the white background 1 for reading the sheet original.
The sheet is fed to the second document reading area F2 through the adjacent portion (which may be in contact) β located at the boundary between 0 and the white platen 4.

Reference numeral 60 denotes a controller 60 which controls the automatic document feeder AF or the like so as to perform a predetermined operation.

As shown in FIG. 3, the size of the ruler member 14 is displayed, and as shown in FIGS. 2 and 4, the ruler member 14 is displaced upward by the leaf spring 15 and the automatic document feeder 100. 1 is in a sheet document passable state as shown in FIG. 1, it is pushed down to a state shown in FIG.
It allows the passage of sheet documents.

FIG. 5 shows the vicinity of the sheet original reading area. In the sheet original reading white background 10, stoppers 10b and 10c are adhered to a resin film sheet 10a such as a white polyester film, and a weight 17 is used. The contact glass 70 is configured to be lightly pressed.

As shown in FIG. 6, the contact sensor 50 collects the original image light on the contact glass 70 illuminated by the light source L such as the LED array arranged on the substrate 55 by the rod lens 52 and collects the image light from the CCD or the like. An image is formed on the reading element 53.

Since the contact sensor 50 has a relatively short depth of focus, the white background of the pressure plate 4 and the white background of the sheet original reading 1
It is desirable that 0 is in close contact with the contact glass 70. The platen white background 4 is relatively strong by the platen elastic material 3,
The sheet white reading background 10 is pressed by a weight 17 with a strength that allows the sheet original to pass therethrough.

On the other hand, when the automatic document feeder 100 is in the open state, the ruler member 14 is lifted by the leaf spring 15 and protrudes onto the contact glass 70 as shown in FIG. 4 or 1. , The ruler member 1
It can be set by sticking to 4, and accurate positioning is possible.

Further, when the automatic document feeder 100 is in the closed state as shown in FIG. 1, the protrusion 11 pushes down the ruler member 14 to allow passage of the document placed on the sheet document table 1. To do. By doing this
It is possible to dispose the second reading area F2 such as a sheet original in the original reading area F1, and it is possible to minimize the length in the moving direction of the contact sensor 50.

Further, in the present invention, FIG. 1 and FIG.
As shown in, the illumination is performed from the downstream side in the sheet document moving direction.

As a result, a good image can be obtained without reading unnecessary lines even when reading a small thick document.

That is, if the LED array 54 is arranged on the white platen 4 side (sheet original entry side) as shown in FIG. 7, the irradiation light strikes the white platen 4 as shown in FIG.
The end of the shadow is shaded and the γ part is shaded. Therefore, when there is no document in the entire reading size, the shadow of the γ portion is read in the portion outside the document O as shown in FIG. Since this is an unnecessary image, it becomes uncomfortable.

The reading optical system may be a reduction optical system using a lens and a mirror.

[0037]

As described above, according to the present invention,
Since the second original reading area is set within the first original reading area, the device configuration can be downsized by the amount of the second original reading area, and the weight and cost can be reduced.

Further, by arranging the reading illumination means on the downstream side of the second original feeding movement with respect to the reading position of the reading optical system, the boundary between the first background member and the second background member is The image is not read as a shadow, and a good image can be obtained even when reading a small-sized document.

Further, by providing the ruler member for positioning the first original, the first original can be accurately positioned on the platen. On the other hand, when the second original is read, the ruler member is pulled in from the upper surface of the platen so that the feeding of the second original is not affected.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an image reading apparatus according to an embodiment of the present invention.

FIG. 2 is a side view of the vicinity of the ruler member shown in FIG.

FIG. 3 is a plan view of a ruler member.

FIG. 4 is an enlarged view of the vicinity of a sheet document reading position when the pressure plate is pressed.

FIG. 5 is a state diagram of the ruler member when the pressure plate is separated.

FIG. 6 is a detailed view of a reading unit.

FIG. 7 is a diagram when the illumination means is reversed.

FIG. 8 is a schematic diagram of a read image in the state of FIG. 7.

FIG. 9 is a partially enlarged view of FIG. 7.

[Explanation of symbols]

 1 sheet original table 2 sheet original auxiliary table 3 pressure plate elastic material 4 pressure plate white background (first background member) 5 preliminary conveyance roller 6 pressing plate 7 separation piece 8 separation roller 9 front conveyance roller pair 10 sheet original reading white background (second Background member) 10a Resin film sheet 10b, 10c Stopper 11 Protrusion 12 Rear transport roller 13 Rear transport roller 14 Ruler member 15 Leaf spring 16 Ruler member holding plate 17 Weight 18 Paper ejection tray 50 Contact sensor (reading optical system) 51 Glass 52 Rod lens 53 Reading element 54 Light source (illuminating means) 55 Substrate 60 Controller 70 Contact glass (platen) α, β Adjacent point between elastic material of platen plate and white background for reading sheet original 100 Automatic document feeder 200 Reader main body

Claims (3)

[Claims] 1. A platen having a first original reading area on which a first original such as a thick original should be placed, and a sheet original in a second original reading area set at a predetermined position on the platen. A document feeding means for feeding a second document such as a document, a reading optical system capable of reading the first and second documents on the platen, and a document surface to be read by the reading optical system. And an illuminating unit for reading the first original, the original is placed in the first original reading area, and the reading optical system is moved to perform reading scanning of the original image. When reading the original document, an image reading apparatus for reading and scanning the original image by fixing the reading optical system and feeding and moving the second original to the second original reading area by the original feeding unit. In reading the second document A first background member for setting a region within the first original reading area and covering a portion of the first original reading area other than the second original reading area; and the second original reading area. And a second background member for covering the first original document when reading the first original document, the first original document is pressed onto the platen by the first and second background members, and When reading a document, the first and second
The image reading apparatus is characterized in that the sheet is fed and moved into the second document reading area between the platen and the second background member through the gap between the background members. 2. The image reading apparatus according to claim 1, wherein the illuminating unit is arranged downstream of the reading position of the reading optical system in the second document feeding movement direction. 3. A ruler member for positioning the first original document is configured to be projectable / retractable with respect to the upper surface of the platen, and when the second original document is read, the ruler member is retracted from the upper surface of the platen to make the first original document retractable. 3. When reading a document, it is projected on the upper surface of the platen.
The image reading apparatus described in 1.