HK1184859A - Optical device, optical device fabrication method and projector including same optical device - Google Patents

Description

Optical device, method of assembling optical device, and projector including optical device

The present application is based on japanese patent application 2011-.

Technical Field

The present invention relates to an optical device, an assembling method of the optical device, and a projector having the optical device.

Background

Currently, a large number of data projectors are used as image projection apparatuses that project images such as images of screens and video images of personal computers and images based on image data stored in memory cards onto screens.

The projector condenses light emitted from a light source onto a micromirror display element called a DMD (digital micromirror device) or a liquid crystal panel, thereby displaying a color image on a screen.

Among such projectors, a projector using a high-luminance discharge lamp as a light source has been mainly used, but in recent years, various projectors using a light-emitting diode, a laser diode, an organic EL, a phosphor, or the like as a light source have been widely developed.

In addition, such a projector includes: the fluorescent wheel includes a plurality of collimator lenses corresponding to the plurality of laser light sources, and emits excitation light emitted from the plurality of laser light sources through the plurality of collimator lenses onto the phosphor layer of the fluorescent wheel through the condensing lens, thereby emitting fluorescent light from the phosphor layer.

In this light source device, an optical device using a mirror or a lens is used to guide light guide means such as an optical channel in which the optical axes of red light, green light, and blue light are aligned.

In addition, japanese patent application laid-open No. 2006-209832 discloses a method of manufacturing an optical device in which a plurality of spacers having a predetermined thickness are used to perform position adjustment.

In this optical apparatus, a drive magnet of an optical head device of a CD player or the like is driven to control the position of a movable member including an optical element in the optical head device or the like.

However, the optical device described in japanese patent application laid-open No. 2006-209832 is configured such that the thickness of the optical device when fastened with a screw is changed in accordance with the number of spacers arranged by height adjustment.

This changes the amount of screw engagement, and requires adjustment of the tightening torque each time the screw is tightened.

Disclosure of Invention

The present invention has been made in view of the above-described problems of the conventional technology, and an object of the present invention is to provide an optical device, an assembling method of the optical device, and a projector including the optical device, which have high performance while reducing manufacturing cost by simplifying manufacturing processes.

In the optical device according to the first aspect of the present invention, the optical member is fixed to the base member with a screw through a spacer, and the spacer is inserted into at least one of a first space between the optical member and the base member and a second space between the base member and a head of the screw, so that the total thickness of the spacer is constant.

A method of assembling an optical device according to a second aspect of the present invention is an optical device in which an optical member is fixed to a base member with a screw through a spacer, the method including: a temporary fixing step of temporarily fixing the optical member to the base member by a screw; an adjustment step of adjusting a distance between the optical member and the base member by inserting a spacer having a predetermined thickness between the optical member and the base member as necessary; and a screwing step of inserting another spacer having a thickness that allows a fitting amount of the screw to the optical member to be constant between the base member and the head of the screw, and screwing the screw.

A projector according to a third aspect of the present invention is a projector including an optical device, comprising: the light source device according to the present invention; a display element; a light source side optical system that guides light from the light source device to the display element; a projection-side optical system that projects an image emitted from the display element onto a screen; and a projector control mechanism that controls the light source device and the display element.

Drawings

Fig. 1 is an external perspective view showing a projector according to an embodiment of the present invention.

Fig. 2 is a diagram showing functional circuit blocks of the projector according to the embodiment of the present invention.

Fig. 3 is a schematic plan view showing an internal structure of a projector according to an embodiment of the present invention.

Fig. 4 is a front perspective view of an optical device employing a light guiding optical system of an embodiment of the present invention.

Fig. 5 is a diagram showing an example of assembly of an optical device according to an embodiment of the present invention.

Fig. 6 is a diagram showing another example of assembling the optical device according to the embodiment of the present invention.

Fig. 7 is a flowchart showing a flow of an assembling method of an optical device according to an embodiment of the present invention.

Fig. 8 is a diagram for explaining an adjustment process of the method of assembling an optical device according to the embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is an external perspective view of a projector 10.

In the present embodiment, the left and right of the projector 10 indicate the left and right direction with respect to the projection direction, and the front and rear indicate the front and rear direction with respect to the screen side direction of the projector 10 and the traveling direction of the light beam.

As shown in fig. 1, the projector 10 has a substantially rectangular parallelepiped shape, and has a lens cover 19 covering a projection opening on a side of the front panel 12 which is a side plate in front of the projector housing, and a plurality of air intake holes 18 are provided in the front panel 12.

The projector 10 includes an Ir receiving unit, not shown in fig. 1, and receives a control signal from a remote controller.

Further, a key/indicator portion 37 is provided on the upper surface panel 11 of the housing.

The key/indicator portion 37 is provided with the following keys or indicators: a power switch key; a power indicator reporting on or off of the power; a projection switch key for switching on and off of projection; and an overheat indicator for notifying that the light source unit, the display element, the control circuit, or the like is overheated.

Further, on the back surface of the housing, various terminals 20 such as an input/output connector portion including: a USB terminal; a video signal input D-SUB terminal, S terminal, RCA terminal, audio output terminal, etc. for inputting analog RGB video signals.

Further, a plurality of air intake holes are formed in the rear panel.

Further, a plurality of air discharge holes 17 are formed in the right side panel, which is a side panel of the case, not shown, and the left side panel 15, which is a side panel shown in fig. 1.

Further, the left side panel 15 is also formed with air intake holes 18 at the corners near the rear panel.

Next, a projector control mechanism of the projector 10 will be described with reference to the functional block diagram of fig. 2.

The projector control mechanism includes: a control unit 38, an input/output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like.

The control unit 38 controls operations of the circuits in the projector 10, and includes a CPU, a ROM that fixedly stores operation programs such as various settings (setting), and a RAM used as a work memory.

Then, with the projector control means, the image signals of various specifications input from the input/output connection unit 21 are converted into image signals of a predetermined format suitable for display by the image conversion unit 23 via the input/output interface 22 and the System Bus (SB), and then output to the display encoder 24.

Further, the display encoder 24 expands and stores the input image signal in the video RAM25, generates a video signal from the stored content of the video RAM25, and outputs the video signal to the display drive section 26.

The display driver 26 functions as a display device control means, and drives the display device 51, which is a spatial light modulator (SOM), at an appropriate frame rate in accordance with the image signal output from the display encoder 24.

The projector 10 irradiates the light beam emitted from the light source unit 60 onto the display element 51 via a light source side optical system described later, forms a light image by the reflected light from the display element 51, and projects and displays the image on a screen, not shown, via a projection side optical system.

The lens motor 45 drives the movable lens group 235 of the projection side optical system for zoom adjustment and focus adjustment.

Further, the image compressing/expanding section 31 performs the following recording processing: the luminance signal and the color difference signal of the image signal are data-compressed by ADCT, huffman coding, and the like, and are sequentially written into the memory card 32 which is a removable recording medium.

Further, the image compressing/expanding section 31 performs the following processing: in the playback mode, the image data recorded in the memory card 32 is read out, each image data constituting a series of moving images is expanded in 1 frame units, and the image data is output to the display encoder 24 via the image conversion unit 23, so that the moving images and the like can be displayed based on the image data stored in the memory card 32.

Further, an operation signal of a key/pointer unit 37 including a main key, a pointer, and the like provided on the upper surface panel 11 of the housing is directly sent to the control unit 38.

The key operation signal from the remote controller is received by the Ir receiving unit 35, and the code signal demodulated by the Ir processing unit 36 is output to the control unit 38.

The control unit 38 is connected to the audio processing unit 47 via a System Bus (SB).

The audio processing unit 47 includes an audio source circuit such as a PCM audio source, and simulates audio data in a projection mode and a reproduction mode, and drives a speaker 48 to perform sound amplification and reproduction.

The control unit 38 controls a light source control circuit 41 as a light source control means.

The light source control circuit 41 performs individual control of causing the light source unit 60 to emit light in red, green, and blue wavelength bands so that light in a predetermined wavelength band required for image generation is emitted from the light source unit 60.

The control unit 38 causes the cooling fan drive control circuit 43 to detect the temperature by a plurality of temperature sensors provided in the light source unit 60 and the like, and controls the rotation speed of the cooling fan based on the result of the temperature detection.

Further, the control unit 38 performs the following control: the cooling fan drive control circuit 43 continues the rotation of the cooling fan even after the power supply of the projector main body is turned off by a timer or the like, or turns off the power supply of the projector main body based on the result of the temperature detection by the temperature sensor.

Next, the internal structure of the projector 10 will be described.

Fig. 3 is a schematic plan view showing an internal structure of the projector 10.

As shown in fig. 3, the projector 10 includes a control circuit board 241 in the vicinity of the right panel 14.

The control circuit board 241 includes a power supply circuit block, a light source control block, and the like.

The projector 10 includes a light source unit 60 at a side of the control circuit board 241, that is, at a substantially central portion of the projector housing.

The projector 10 further includes an optical system unit 160 between the light source unit 60 and the left side panel 15.

The light source unit 60 includes: an excitation light irradiation device 70 disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the projector housing; a fluorescent light emitting device 100 disposed on the optical axis of the bundle of light rays emitted from the excitation light irradiation device 70 and in the vicinity of the front panel 12; a red light source device 120 disposed between the excitation light irradiation device 70 and the fluorescent light emitting device 100; and a light guide optical system 140 that converts the light emitted from the fluorescent light emitting device 100 and the light emitted from the red light source device 120 so that the optical axes thereof are the same, and concentrates the respective color lights to a predetermined surface, i.e., an entrance port of the light tunnel 175.

The excitation light irradiation device 70 includes: a light source group 72 including a plurality of excitation light sources 71, the plurality of excitation light sources 71 being arranged such that optical axes thereof are parallel to the rear panel 13; a plurality of reflection mirrors 75 for converting the optical axis of the light emitted from each excitation light source 71 by 90 degrees toward the front panel 12; a condenser lens 78 that condenses the light emitted from each excitation light source 71 reflected by the plurality of mirrors 75; and a heat sink 81 disposed between the excitation light source 71 and the right side panel 14.

In the light source group 72, excitation light sources 71 as a plurality of blue laser emitters are arranged in a matrix of 24 in total, 3 rows and 8 columns.

Further, a collimator lens 73 is disposed on the optical axis of each excitation light source 71, and the collimator lens 73 converts the light emitted from each excitation light source 71 into parallel light to improve the directivity thereof.

The plurality of mirrors 75 are arranged in a stepwise manner, and narrow the interval between the light source beams emitted from the excitation light sources 71, thereby reducing the cross-sectional area of the light beam emitted from the light source group 72 in the horizontal direction and reflecting the light beam toward the condenser lens 78 and the concave lens 79.

2 cooling fans 261 are disposed between the heat sink 81 and the rear panel 13, and the excitation light sources 71 are cooled by the cooling fans 261 and the heat sink 81.

A cooling fan 261 is also disposed between the mirror 75 and the rear panel 13, and the mirror 75 and the condenser lens 78 are cooled by the cooling fan 261.

The fluorescent light-emitting device 100 includes: a fluorescent wheel 101 disposed parallel to the front panel 12, i.e., orthogonal to the optical axis of the light emitted from the excitation light shining device 70; a wheel motor 110 for rotationally driving the fluorescent wheel 101; a condenser lens group 111 having a condenser lens 151 and the like, for condensing the light beam emitted from the excitation light shining device 70 on the luminescent wheel 101 and for condensing the light beam emitted from the luminescent wheel 101 toward the back panel 13; and a condenser lens 115 for condensing the light beam emitted from the fluorescent wheel 101 toward the front panel 12.

The fluorescent wheel 101 is provided with: a green fluorescence light emitting region for receiving the emitted light from the excitation light irradiation device 70 as excitation light and emitting fluorescence light in a green wavelength band; and a diffusion transmission region for diffusing and transmitting the light emitted from the excitation light shining device 70.

The base material of the green fluorescence emission region is a metal base material made of copper, aluminum, or the like, and the surface of the base material on the back panel 13 side is mirror-finished by silver vapor deposition or the like, and a layer of a green phosphor is provided on the mirror-finished surface.

The base material of the diffusion transmission region is a transparent base material having light transmittance, and fine irregularities are formed on the surface of the base material by sandblasting or the like.

Further, the green phosphor in the green phosphor layer is excited by the light emitted from the excitation light shining device 70 and irradiated to the green phosphor layer of the phosphor wheel 101.

The light beams emitted from the green phosphor to the omnidirectional fluorescence are emitted directly to the rear panel 13 side, or are reflected by the surface of the fluorescent wheel 101 and emitted to the rear panel 13 side, and are incident on the condenser lens group 111.

Further, the light emitted from the excitation light shining device 70 and shone on the diffusion transmission region of the luminescent wheel 101 enters the condenser lens 115 as diffused transmission light diffused by the fine irregularities.

Further, a cooling fan 261 is disposed between the wheel motor 110 and the front panel 12, and the fluorescent light emitting device 100 and the like are cooled by the cooling fan 261.

The condenser lens group 111 will be described in detail later as an application example of the optical device of the present invention.

The red light source device 120 is a monochromatic light emitting device, and includes: a red light source 121 disposed with its optical axis parallel to the excitation light source 71; and a condensing lens group 125 for condensing light emitted from the red light source 121.

The red light source 121 is a red light emitting diode that emits light in the red wavelength band.

The red light source device 120 is disposed such that the optical axis intersects with the light emitted from the excitation light shining device 70 and the green wavelength band light emitted from the luminescent wheel 101.

Further, the red light source device 120 includes a heat sink 130 disposed on the right panel 14 side of the red light source 121.

A cooling fan 261 is disposed between the heat sink 130 and the front panel 12, and the red light source 121 is cooled by the cooling fan 261.

Further, the light guide optical system 140 includes: a condenser lens for condensing the light beams of red, green, and blue wavelength bands, a mirror and a dichroic mirror for converting the optical axes of the light beams of the respective wavelength bands so that the optical axes are the same, and the like.

Specifically, a first dichroic mirror 141 is disposed at a position where the blue wavelength band light emitted from the excitation light shining device 70 and the green wavelength band light emitted from the luminescent wheel 101 intersect the red wavelength band light emitted from the red light source device 120, and the first dichroic mirror 141 transmits the blue and red wavelength band light, reflects the green wavelength band light, and converts the optical axis of the green light by 90 degrees toward the left side panel 15.

Further, a first reflecting mirror 143 is disposed on the optical axis of the blue wavelength band light diffused and transmitted from the luminescent wheel 101, that is, between the condenser lens 115 and the front panel 12, and the first reflecting mirror 143 reflects the blue wavelength band light and converts the optical axis of the blue light by 90 degrees toward the left panel 15.

Further, a second reflecting mirror 145 is disposed on the optical axis of the blue wavelength band light reflected by the first reflecting mirror 143 and in the vicinity of the optical system unit 160, and the second reflecting mirror 145 converts the optical axis of the blue light by 90 degrees toward the rear panel 13.

Further, a second dichroic mirror 148 is disposed at a position where the optical axis of the red wavelength band light transmitted from the first dichroic mirror 141, the optical axis of the green wavelength band light reflected by the first dichroic mirror 141 so as to coincide with the optical axis of the red wavelength band light, and the optical axis of the blue wavelength band light reflected by the second reflecting mirror 145 intersect, and the second dichroic mirror 148 transmits the blue wavelength band light, reflects the red and green wavelength band light, and converts the optical axes of the red and green light by 90 degrees toward the rear panel 13.

Further, a condensing lens is disposed between the dichroic mirror and the reflecting mirror.

In the vicinity of the light tunnel 175, a condenser lens 173 that condenses the light source light is disposed at an entrance port of the light tunnel 175.

The optical system unit 160 is formed in a substantially U shape from the following 3 blocks: an illumination side block 161 located on the left side of the excitation light shining device 70, an image generation block 165 located near the position where the back panel 13 and the left side panel 15 intersect, and a projection side block 168 located between the light guide optical system 140 and the left side panel 15.

The illumination side block 161 includes a part of the light source side optical system 170 that guides light source light emitted from the light source unit 60 to the display element 51 disposed in the image generation block 165.

The light source side optical system 170 included in the illumination side block 161 includes: a light tunnel 175 that makes the bundle of light rays emitted from the light source unit 60 into a beam of uniform intensity distribution; a condenser lens 178 for condensing the light emitted from the light tunnel 175; and an optical axis conversion mirror 181 which converts the optical axis of the light flux emitted from the light tunnel 175 into the direction of the image generation block 165, and so on.

The image generation block 165 includes, as the light source side optical system 170: a condensing lens 183 for condensing the light source light reflected by the optical axis changing mirror 181 on the display element 51; and an irradiation mirror 185 for irradiating the display element 51 with the light flux transmitted through the condenser lens 183 at a predetermined angle.

The image generation block 165 includes a DMD which is the display element 51.

A heat sink 190 for cooling the display element 51 is disposed between the display element 51 and the rear panel 13, and the display element 51 is cooled by the heat sink 190.

In addition, a condenser lens 195 as a projection side optical system 220 is disposed near the front surface of the display device 51.

The projection side block 168 has a lens group of the projection side optical system 220, and emits the operating light reflected by the display element 51 onto the screen.

The projection-side optical system 220 includes a fixed lens group 225 incorporated in a fixed lens barrel and a movable lens group 235 incorporated in a movable lens barrel.

These members are used as a variable focus lens having a zoom function, and zoom adjustment and focus adjustment can be performed by moving the movable lens group 235 by a lens motor.

Next, as an optical device of the present invention, a configuration in which each lens and a mirror of the light guide optical system 140 are disposed on the base member will be described in detail with reference to the drawings.

Fig. 4 is a front perspective view showing the structure of the optical device inside the projector 10, with the upper cover removed.

The optical device combines the excitation light irradiation device 70, the red light source device 120, and the fluorescent wheel 101 to form the light source unit 60 of the projector 10.

As shown in fig. 4, in the optical device as the light guide optical system 140, a thin plate-shaped substantially pentagonal base member 150 made of hard resin or metal is disposed at the bottom of the projector 10, a lens frame 152 or the like and a mirror frame or the like for fixing each lens are attached to the upper surface of the base member 150, and the lens frame 152 or the like and the mirror frame or the like are disposed at predetermined positions.

As shown in fig. 4, an optical device as the light guide optical system 140 includes, on an upper surface of a base member 150: a concave lens 79, a first dichroic mirror 141, a first reflecting mirror 143, a second reflecting mirror 145, a second dichroic mirror 148, a condenser lens group 111 having a condenser lens 151 and the like between the dichroic mirror and/or the reflecting mirror, and condenser lenses 144, 146 and the like.

Further, a condenser lens 173 that condenses the light source light to an entrance port of the light tunnel 175 is disposed in the vicinity of the light tunnel 175.

The lenses and the mirrors are fixed to a lens frame and a mirror frame, which are provided separately, and can be attached to predetermined positions of the base member 150.

When the optical axes of the light emitted from the light sources are deviated, the light collecting efficiency is lowered and the luminance is lowered, so that it is necessary to adjust the optical axes.

The optical axis of the emitted light is appropriately adjusted when the lens frame, the mirror frame, or the like is attached to the base member 150 so that the optical axis of each color light incident on the incident port of the light tunnel 175 enters a predetermined position at a predetermined angle.

Further, it is sometimes effective in terms of workability and ease of adjustment to perform final adjustment of the optical axis when mounting the condenser lenses 144 and 146.

In the present embodiment, a configuration in which the vertical direction of the optical axis of the light emitted from the excitation light source 71 is positioned when the condenser lenses 151 of the condenser lens group 111 are arranged at predetermined positions on the base member 150 as final fine adjustment of the optical axis will be described with reference to the drawings, in which the condenser lenses 151 are lenses positioned in the vicinity of the fluorescent wheel 101 that condense the light beams emitted from the excitation light source 71 onto the fluorescent wheel 101 and that condense the light beams emitted in the direction of the excitation light source 71.

Fig. 5 is an explanatory diagram of an example in which 3 spacers 157 of the optical device are inserted upward and 3 spacers are inserted downward.

Fig. 6 is an explanatory diagram of an example in which 4 spacers 157 of the optical device are inserted upward and 2 spacers are inserted downward.

In the present embodiment, the upper and lower sides of the optical device refer to the upper and lower sides in a state where the projector 10 is placed on a table.

As shown in fig. 5 or 6, the optical device includes: a base member 150; a condenser lens 151 which is an optical member constituting a part of the condenser lens group 111; a lens frame 152 for fixing the condenser lens 151; 2 screws 155, 156 for fixing the lens frame 152 to the base member 150; and a predetermined number of spacers 157 for adjusting the attachment position of the lens frame 152 in the vertical direction.

The base member 150 is made of thin plate-shaped hard resin or metal.

The base member 150 has projections and recesses, grooves, mounting holes, and the like on the upper surface and the lower surface thereof for mounting the lenses, the mirrors, the fluorescent light-emitting device 100, and the like of the light guide optical system 140 at predetermined positions.

As described above, the condenser lens 151 is a lens included in the condenser lens group 111, and condenses the light beam emitted from the excitation light shining device 70 to the luminescent wheel 101 and condenses the light beam emitted from the luminescent wheel 101 toward the excitation light shining device 70 to the vicinity of the luminescent wheel 101.

That is, the condenser lens 151 is a lens that condenses the bundle of rays of light emitted from the excitation light source 71 toward the luminescent wheel 101 and the bundle of rays of light reflected from the luminescent wheel 101 and emitted toward the excitation light shining device 70.

Further, since the exit angle of the bundle of rays of light incident on the luminescent wheel 101 is the smallest, the sensitivity with respect to the luminance performance is high, and the luminance is lowered by a slight displacement of the mounting position of the condenser lens 151.

Therefore, it is highly necessary to finely adjust the optical axis of light transmitted through the condensing lens 151 by moving the lens for adjustment.

The lens frame 152 is a rectangular plate made of hard resin, and has a hole in the center thereof for disposing the condenser lens 151.

Further, by disposing the lens frame 152 at a predetermined position of the base member 150, the optical axis left-right direction of the light beam incident on the condenser lens 151 coincides with the optical axis left-right direction of the condenser lens 151.

In order to fix the lens frame 152 as an optical member to the base member 150, screws 155 and 156 are screwed in at 2 in the vertical direction from below the base member 150 toward above.

The spacer 157 is U-shaped of stainless material, having the same shape with the same thickness (e.g., 0.2 mm).

The spacer 157 is inserted between the base member 150 and the lens frame 152 by a required number of predetermined numbers, for example, 6 sheets, from the lateral direction, and adjusts the position of the condenser lens 151 in the optical axis height direction (vertical direction).

That is, as shown in fig. 5 and 6, the position of the incident light to the entrance port of the optical tunnel 175 is changed by changing the lens position in the vertical direction and changing the optical axis of the transmitted light in the vertical direction.

The spacer 157 remaining after the use of a desired number of the predetermined number is inserted laterally between the base member 150 and the heads of the screws 155 and 156, and the screws 155 and 156 are screwed, thereby fixing the base member 150 and the lens frame 152.

With such a configuration, even if the number of spacers 157 arranged above changes when the optical device is attached and fixed to the base member 150 and the lens frame 152, the amount a of screws 155 and 156 can be kept constant by inserting the number of spacers 157, which is the number remaining after subtracting the required number from the predetermined number, below the base member 150.

Therefore, by making the fastening torque of the screws 155 and 156 constant, the work efficiency and reliability of assembly can be improved.

Next, an assembling method of the optical device of the present invention will be described with reference to fig. 7 and 8.

Fig. 7 is a flowchart illustrating a flow of an assembling method of an optical device according to an embodiment of the present invention.

Fig. 8 is a diagram for explaining an adjustment process of the method of assembling an optical device according to the embodiment of the present invention.

As described above, the optical device includes the base member 150, the condenser lens 151, the lens frame 152, the screws 155 and 156, and the spacer 157, and the condenser lens 151 and the lens frame 152 as optical members are fixed to the base member 150 via the spacer 157 by the screws 155 and 156 and are assembled.

The method of assembling the optical device first performs a preparation step of preparing a predetermined number of spacers 157 having the same thickness and the same shape (step S1).

Next, a temporary fixing step is performed to temporarily fix the lens frame 152, which is an optical member to which the condenser lens 151 is attached in advance, to the base member 150 by 2 screws 155 and 156 (step S2).

Next, as shown in fig. 8, an adjustment step is performed to adjust the vertical attachment position of the optical member and the base member 150, that is, the distance by inserting a predetermined number of spacers 157 between the optical member and the base member 150 (step S3).

After the required number of spacers 157 are inserted and the distance between the optical member and the base member 150 is appropriately adjusted, a screwing step is performed in which the U-shaped spacers 157 remaining after the required number of spacers has been used for the predetermined number of spacers are inserted between the base member 150 and the heads of the screws 155 and 156 in the lateral direction, and 2 screws 155 and 156 are screwed (step S4).

That is, when 3 spacers 157 are inserted between the optical member and the base member 150, as shown in fig. 5, a screwing step of inserting the remaining 3 spacers 157 from the lateral direction between the base member 150 and the heads of the screws 155 and 156 and screwing in 2 screws 155 and 156 is performed.

When 4 spacers 157 are inserted between the optical member and the base member 150, as shown in fig. 6, a screwing step is performed in which the remaining 2 spacers 157 are inserted between the base member 150 and the heads of the screws 155 and 156 from the lateral direction, and the 2 screws 155 and 156 are screwed in.

As described above, in the method of assembling the optical device according to the present embodiment, the engagement amount a of the lens frame 152 and the screws 155 and 156 is constant, and the fastening torque of the screws 155 and 156 is constant when the lens frame 152 is attached to the base member 150, so that the assembling operation efficiency and reliability can be improved.

This allows the screws 155 and 156 to be fixed in the same manner without individually changing the length and torque.

The spacer having a constant total thickness for keeping the blending amount a constant may be disposed only above the base member 150 or only below the base member 150 depending on the accuracy of parts.

That is, the total thickness of the spacer may be constant, and one of the thicknesses of the spacer may be 0, that is, the spacer may not be inserted into one of the thicknesses.

By performing the adjustment in this way, the adjustment range can be widened.

In the present embodiment, a plurality of spacers 157 having the same thickness are prepared and assembled as spacers, but spacers having different thicknesses may be used to keep the amount of incorporation a constant.

That is, in the example of fig. 5, 1 spacer having a thickness of 3 spacers 157 may be inserted above the base member 150, and 1 spacer having a thickness of 3 spacers 157 may be inserted below the base member 150.

In the example of fig. 6, 1 spacer having a thickness of 4 spacers 157 may be inserted above the base member 150, and 1 spacer having a thickness of 2 spacers 157 may be inserted below the base member 150.

Further, the thickness of the base member 150 above and below the base member may be adjusted by combining spacers having different thicknesses.

In addition, although the present embodiment has been described as the case where the optical device is applied to the condenser lens group 111 positioned on the incident light side to the fluorescent light emitting device 100 as the optical device, the assembling method of the present invention and the structure of the spacer 157 used when the lens frame 152 and the base member 150 are attached may be applied to, for example, the condenser lens 173 positioned near the entrance port of the light tunnel 175 or the guide lens to the light tunnel 175.

In the present embodiment, although the example of adjusting the vertical direction of the optical axis is illustrated in the optical device having the above-described configuration, when the adjustment in the horizontal direction is desired, the lens frame of the lens may be attached to the base member that stands vertically on the bottom of the projector 10 having the above-described configuration from the lateral direction, and a spacer may be inserted therebetween.

In addition, as a simple method, in the example shown in fig. 5 and 6 in which the optical axis adjustment can be performed in the vertical direction, the screw holes for the screws 155 and 156 are not formed as perfect circles but are formed as holes long in the left-right direction, and the left-right direction of the optical axis can be adjusted by adjusting the screws in the left-right direction.

As described above, according to the embodiments of the present invention, it is possible to provide an optical device, an assembling method of the optical device, and a projector 10 including the optical device, which can simplify the manufacturing process, reduce the manufacturing cost, and provide high performance.

Further, according to the embodiment of the present invention, since all the spacers 157 of the predetermined number have the same thickness, the height can be easily adjusted by adjusting only the number of the spacers 157.

In addition, since the amount a of engagement of the screws 155 and 156 is constant within the adjustment range, the screws 155 and 156 can be fixed in the same manner without individually changing the length and torque thereof.

Further, according to the embodiment of the present invention, since the spacer 157 has a U-shape, the spacer 157 can be inserted from the lateral direction only by loosening the screws 155 and 156 without detaching the screws 155 and 156.

Further, according to the embodiment of the present invention, the optical member and the base member 150 are fixed by screwing the screws 155 and 156 in the vertical direction of the base member 150, and thus the optical member and the base member 150 can be fixed with high accuracy and firmness.

Further, according to the embodiment of the present invention, since 2 screws 155 and 156 are provided, the predetermined surface can be fixed with a uniform force, and rotation of the mounting position and the like can be suppressed.

Further, according to the embodiment of the present invention, since the spacer 157 is made of a stainless material, corrosion can be prevented, and the optical axis position can be prevented from being displaced with time, so that the luminance performance of the projection light can be maintained.

Furthermore, according to the embodiment of the present invention, the optical device can also be applied to any lens in the light source device that guides red light, green light, or blue light to the light tunnel 175, so that each lens in the projector 10 can be easily mounted.

Further, according to the embodiment of the present invention, since the optical member includes the lens formed of the condensing lens or the like, the alignment of the optical axis of the emitted light can be easily performed.

Further, according to the embodiment of the present invention, since the lens is a condenser lens disposed between the excitation light source 71 and the luminescent wheel 101, it is possible to adjust the position of light having high directivity, and it is possible to adjust luminance with high efficiency.

Further, according to the embodiment of the present invention, since the exit angle of the light beam of the incident light to the fluorescent wheel 101 is the smallest, the adjustment sensitivity is high, and the adjustment can be performed by slightly moving the mounting position of the condenser lens 151, thereby enabling efficient luminance adjustment.

Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention.

These new embodiments can be implemented in other various forms, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention.

These embodiments and modifications are included in the scope and spirit of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

Claims (14)

1. An optical device, wherein,

fixing the optical member to the base member with a screw via the spacer,

the spacer is inserted into at least one of a first space between the optical member and the base member and a second space between the base member and the head of the screw, and the total thickness of the spacer is constant.

2. The optical device of claim 1,

the spacers are stacked to have the same thickness, so that the total thickness of the spacers is constant.

3. The optical device of claim 1,

the spacer is U-shaped.

4. The optical device of claim 1,

the screw is screwed in the vertical direction of the base member to fix the optical member and the base member.

5. The optical device of claim 1,

the number of the screws is 2.

6. The optical device of claim 1,

the spacer is made of stainless steel.

7. The optical device of claim 1,

the optical device is a light source device.

8. The optical device of claim 1,

the optical component is a lens.

9. The optical device of claim 8,

the lens is a condenser lens disposed between the excitation light source and the fluorescent wheel.

10. The optical device of claim 9,

the condenser lens is a lens located in the vicinity of the luminescent wheel, and condenses the bundle of rays emitted from the excitation light source to the luminescent wheel and condenses the bundle of rays emitted in the direction of the excitation light source.

11. An assembling method of an optical device, wherein an optical component is fixed to a base member via a spacer by a screw, the assembling method of the optical device comprises the following steps:

a temporary fixing step of temporarily fixing the optical member to the base member by a screw;

an adjustment step of adjusting a distance between the optical member and the base member by inserting a spacer having a predetermined thickness between the optical member and the base member as necessary; and

and a screwing step of inserting another spacer having a thickness that allows the screw to be fitted to the optical member by a predetermined amount between the base member and the head of the screw, and screwing the screw.

12. The method of assembling an optical device according to claim 11,

the spacer is U-shaped so that the spacer is inserted from the lateral direction of the screw.

13. The method of assembling an optical device according to claim 11,

the screw temporarily fixing the optical component to the base component is screwed in at 2.

14. A projector is provided with:

the light source device of claim 7;

a display element;

a light source side optical system that guides light from the light source device to the display element;

a projection-side optical system that projects an image emitted from the display element onto a screen; and

and a projector control mechanism for controlling the light source device and the display element.