JP7169517B2 - Optical device, projection device, and method for manufacturing optical device - Google Patents

Description

The present invention relates to an optical device, a projection device, and a method of manufacturing an optical device.

2. Description of the Related Art Today, a data projector is widely used as an image projection device for projecting a screen of a personal computer, a video image, and an image based on image data stored in a memory card or the like onto a screen. This projector collects light emitted from a light source on a micromirror display element called a DMD (digital micromirror device) or a liquid crystal panel to display a color image on a screen.

With the spread of video equipment such as personal computers and DVD players, projectors, which are projection devices, have expanded their applications from business presentations to home use. In such projectors, conventionally, high-intensity discharge lamps have been the main light source, but in recent years, multiple semiconductor light-emitting elements such as laser diodes have been used as light sources, and along with this, multiple lenses, mirrors, and the like have been used. 2. Description of the Related Art Numerous developments and proposals have been made for light source devices as optical devices composed of optical members.

For example, Patent Literature 1 discloses a projection device including a light source device that emits light source light of each color wavelength band using a red light source, a green light source, and a blue light source. This light source device aligns each color wavelength band light from each color light source on the same optical path with a plurality of optical members, and emits this light in the same direction as light source light.

JP 2013-97233 A

In the light source device disclosed in Patent Document 1, many optical members such as lenses and mirrors are used in the built-in optical system of the light source device, so that the brightness and color reproducibility of the projected image are enhanced. In order to keep the quality of the projected image high, the arrangement position and the optical axis position of each lens are assembled with a high degree of care.

Therefore, fixing a large number of optical members with screws may lead to an increase in man-hours. In addition, a leaf spring or a cushion material is provided in the cover of the optical case in which a plurality of optical members are housed, and each optical member is pressed and fixed by the leaf spring or the cushion material, which complicates the parts. and an increase in the number of parts.

In view of the above points, it is an object of the present invention to provide an optical device, a projection device, and a method of manufacturing the optical device, which can facilitate the assembly work and improve the positional accuracy of fixing the optical members.

An optical device according to the present invention includes a case having a holding portion that holds an optical member, the holding portion has a recess formed in the case surface as viewed from the outside of the case, and a plurality of openings in the recess. The position and inclination of the optical member are fixed with respect to the case by a fixing agent applied through the plurality of openings that open from the outside to the inside of the case. It is characterized in that it includes a support plate positioned at the bottom of the recess and parallel to the case surface, and a peripheral wall erected from the support plate, and the opening is formed in the support plate .

A projection device according to the present invention comprises the optical device described above, a display element that is irradiated with light source light from the light source device to form image light, and a projector that projects the image light emitted from the display element onto a screen. and a projection device control section for controlling the display element and the light source device.

A method for manufacturing an optical device according to the present invention includes a jig, an optical member, a case having a holding portion in which a recess is formed in a case surface as viewed from the outside, and a plurality of openings are formed in the recess, wherein the recess includes a support plate positioned at the bottom of the recess and parallel to the case surface, and a peripheral wall standing from the support plate, the support plate including placing the optical member on the jig in which the opening is formed; positioning the holding portion of the case on the optical member placed on the jig; The method is characterized by including a step of applying a fixing agent to the plurality of formed openings, and a step of curing the fixing agent.

According to the present invention, it is possible to provide an optical device, a projection device, and a method of manufacturing the optical device, which are capable of facilitating the assembly work and improving the accuracy of fixing the optical members.

1 is an external perspective view showing a projection device according to an embodiment of the present invention; FIG. It is a figure which shows the functional block of the projection apparatus which concerns on embodiment of this invention. 1 is a schematic plan view showing the internal structure of a projection device according to an embodiment of the present invention; FIG. 3 is a schematic plan view of the inside of the optical case of the optical device according to the embodiment of the present invention; FIG. 1 is an exploded perspective view showing a case body and an optical member of an optical case according to an embodiment of the present invention; FIG. 6A is a schematic cross-sectional view showing how a condenser lens is fixed to an optical case according to an embodiment of the present invention, FIG. b) is a view showing a cross section taken along line VI(b)-VI(b) of FIG. 6(a). FIG. 7A is a cross-sectional schematic diagram showing how a reflecting mirror is fixed to an optical case according to an embodiment of the present invention, and FIG. ) is a cross-sectional view taken along line VII(b)-VII(b) of FIG. 7(a). FIG. 8A is a cross-sectional schematic diagram showing how a condenser lens is fixed to an optical case according to an embodiment of the present invention, and (a) shows a VIII(a)-VIII(a) cross section of FIG. 8(b); b) is a cross-sectional view taken along line VIII(b)-VIII(b) of FIG. 8(a).

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated. FIG. 1 is an external perspective view of the projection device 10. FIG. The projection device 10 of this embodiment includes an upper housing 10a and a lower housing 10b. A front panel 12, a rear panel 13, a right panel 14, and a left panel 15, which are side plates of the housing of the projection device 10, stand downward from the outer peripheral edge of the housing top 10a. The lower ends of the panels 12 to 15 come into contact with the outer peripheral edge of the lower housing 10b. Therefore, the projection device 10 is formed in a substantially rectangular parallelepiped shape by the upper housing 10a and the lower housing 10b. In this embodiment, left and right in the projection device 10 indicate the left and right direction with respect to the projection direction, and front and back indicate the screen side direction of the projection device 10 and the front and rear direction with respect to the traveling direction of the light beam.

A key/indicator section 37 and a projection image adjustment section 11a are provided on the top panel 11 of the housing of the projection device 10 . The key/indicator unit 37 includes a power switch key, a power indicator for informing ON/OFF of the power source, a projection switch key for switching projection ON/OFF, and informing when each color light source device, display element, control circuit, or the like is overheated. Keys and indicators for making various settings such as an overheating indicator are arranged. The projection image adjustment unit 11a has one or more rotary knobs. By operating this rotary knob, the position of the movable lens of the projection-side optical system, which will be described later with reference to FIG. 4, is adjusted, and the size and focus of the projected image are adjusted. The projection device 10 also includes an Ir receiver (not shown) that receives a control signal from a remote controller.

An intake hole 310 is provided in the front right corner 501 of the front panel 12 and the right panel 14 . On the left side of the front panel 12, a light emitting portion 12a recessed in a mortar shape is provided. A suction hole 320 is formed in the wall portion of the light emitting portion 12a on the left panel 15 side. The projection device 10 has a projection aperture 12b and a lens cover 19 covering the projection aperture 12b in the light exit portion 12a.

A height adjustment button 12 c is provided at the lower end of the front panel 12 . The projection device 10 has support legs inside the front panel 12 side. The projection device 10 can make its support leg appear and disappear from below while the height adjustment button 12c is pressed. Therefore, the user can adjust the height and inclination of the projection device 10 by fixing the support leg at an arbitrary protruding amount by operating the height adjustment button 12c.

The rear panel 13 is provided with various terminals 20 such as a USB terminal, a D-SUB terminal for inputting an image signal, an S terminal, an input/output connector section having an RCA terminal, etc., and a power adapter plug. Further, in the rear panel 13, an air intake hole 330 is formed in a corner portion 503 on the right side panel 14 side, and an exhaust hole 340 is formed in a corner portion 504 on the left side panel 15 side.

Next, the projection device control section of the projection device 10 will be described using the functional block diagram of FIG. 2 . The projection apparatus control section includes a control section 38, an input/output interface 22, an image conversion section 23, a display encoder 24, a display drive section 26, and the like.

The control unit 38 controls the operation of each circuit in the projection device 10, and is composed of a CPU, a ROM that permanently stores operation programs such as various settings, and a RAM that is used as a work memory. there is

Image signals of various standards input from the input/output connector section 21 are converted into a predetermined format suitable for display by the image conversion section 23 via the input/output interface 22 and the system bus (SB) by the projector control section. After being converted so as to be unified into the image signal, it is output to the display encoder 24 .

The display encoder 24 develops and stores the input image signal in the video RAM 25 , generates a video signal from the storage contents of the video RAM 25 , and outputs the video signal to the display driving section 26 .

The display drive unit 26 drives the display element 51, which is a spatial light modulator (SOM), at an appropriate frame rate corresponding to the image signal output from the display encoder 24. FIG.

The projection device 10 irradiates the display element 51 with a light beam of light source light emitted from the optical device 60 via a light guiding optical system, which will be described later. Form. The projection device 10 projects the formed optical image onto a screen via a projection-side optical system, which will also be described later, to display an image. The movable lens group 235 of the projection-side optical system is driven by a lens motor 45 for zoom adjustment and focus adjustment.

The image compression/decompression unit 31 performs a recording process of compressing the luminance signal and color difference signal of the image signal by processing such as ADCT and Huffman coding, and sequentially writing the compressed data to a memory card 32 which is a detachable recording medium.

Further, the image compression/decompression unit 31 reads image data recorded in the memory card 32 in the reproduction mode, and decompresses individual image data constituting a series of moving images in units of one frame. Then, the image compression/decompression unit 31 outputs the image data to the display encoder 24 via the image conversion unit 23, and performs processing for displaying a moving image or the like based on the image data stored in the memory card 32.

An operation signal of a key/indicator section 37 composed of main keys, indicators, etc. provided on the top panel 11 of the housing is directly sent to the control section 38 . A key operation signal from the remote controller is received by the Ir receiver 35 , and a code signal demodulated by the Ir processor 36 is output to the controller 38 .

An audio processing unit 47 is connected to the control unit 38 via a system bus (SB). The sound processing unit 47 includes a sound source circuit such as a PCM sound source, converts sound data into analog data in the projection mode and the reproduction mode, and drives the speaker 48 to amplify the sound.

Further, the control unit 38 controls a light source control circuit 41 as light source control means. The light source control circuit 41 individually controls the excitation light irradiation device in the green light source device of the optical device 60 and the light emission from the red light source device so that the optical device 60 emits light in a predetermined wavelength band required for image generation. to control. Light in a predetermined wavelength band emitted from the optical device 60 is reflected by the irradiation mirror 185 and irradiated onto the display element 51 .

The control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection using a plurality of temperature sensors provided in the optical device 60 and the like, and controls the rotation speed of the cooling fan based on the temperature detection result. Further, when receiving an instruction to turn off the power of the projection device 10, the control unit 38 uses a timer in the cooling fan drive control circuit 43 to cause the cooling fan to continue rotating even after the power of the main body of the projection device 10 is turned off. Control such as determining the timing of turning off the main body of the projection apparatus 10 can be performed according to the result of temperature detection by the temperature sensor.

Next, the internal structure of the projection device 10 will be described with reference to FIGS. 3 and 4. FIG. FIG. 3 is a schematic plan view showing the internal structure of the projection device 10. As shown in FIG. The projection device 10 includes a power supply device 301 , a control circuit board 302 and an optical device 60 . The projection device 10 also includes an intake fan 260, an intake fan 270, and an exhaust fan 280 as cooling fans.

The optical device 60 is arranged substantially in the center of the housing of the projection device 10 . The optical device 60 has an optical case 61 . The optical case 61 includes an optical case main body 61a with an open top, and a cover 61b attached to the open top. Optical members such as light sources for each color, lenses, and mirrors are housed inside the optical case 61 . The power supply device 301 is arranged on the left panel 15 side of the optical device 60 . The board of the power supply device 301 is arranged substantially parallel to the left panel 15 . The control circuit board 302 is arranged on the rear panel 13 side of the optical device 60 . The control circuit board 302 is arranged substantially perpendicular to the vertical direction. The control circuit board 302 includes a power supply circuit block, a light source control block, and the like. Also, the control circuit board 302 can be provided in a plurality by dividing it for each function such as a power supply circuit block and a light source control block.

Now, the internal structure of the optical device 60 will be described. FIG. 4 is a schematic plan view showing the optical case 61 of the optical device 60 with the cover 61b omitted. The optical device 60 is a red light source device 120 that is a light source of red wavelength band light, a green light source device 80 that is a light source of green wavelength band light, and a blue light source device that is a light source of blue wavelength band light, and is also an excitation light source. and a certain excitation light irradiation device 70 . The green light source device 80 is composed of the excitation light irradiation device 70 and the fluorescent plate device 100 . The optical device 60 has a light guiding optical system 140 . The light guiding optical system 140 combines the light beams of the green wavelength band light, the blue wavelength band light, and the red wavelength band light, and guides the light beams of each color wavelength band onto the same optical path.

The excitation light irradiation device 70 is arranged on the right panel 14 side of the housing of the projection device 10 . The excitation light irradiation device 70 includes a plurality of solid-state light-emitting elements arranged such that the optical axis thereof is parallel to the rear panel 13 . The solid-state light-emitting device of this embodiment is a plurality of blue laser diodes 71 that emit blue wavelength band light. A plurality of blue laser diodes 71 are arranged side by side in parallel with the right panel 14 . These blue laser diodes 71 are fixed to a holder 74 .

The excitation light irradiation device 70 also includes a reflecting mirror 76 , a diffusion plate 78 and a heat sink 81 . The reflecting mirror 76 turns the optical axis of the light emitted from each blue laser diode 71 toward the diffusion plate 78 by approximately 90 degrees. The diffuser plate 78 diffuses the emitted light from each blue laser diode 71 reflected by the reflecting mirror 76 at a predetermined diffusion angle. A heat sink 81 is positioned between the blue laser diode 71 and the right panel 14 .

A collimator lens 73 is arranged on the optical path from each blue laser diode 71 to increase the directivity of the light emitted from the blue laser diode 71 and convert the light into parallel light. These collimator lenses 73 are held by a holder 74 together with the blue laser diode 71 .

The red light source device 120 includes a red light source 121 arranged so that the light beam of the blue laser diode 71 and the optical axis are parallel, and a condenser lens group 125 that collects the light emitted from the red light source 121. . The red light source 121 is a red light-emitting diode, which is a solid-state light-emitting element that emits light in the red wavelength band. Red light source device 120 is arranged such that the optical axis of red wavelength band light emitted from red light source device 120 intersects the optical axis of green wavelength band light emitted from fluorescent plate 101 . The red light source device 120 also includes a heat sink 130 on the right panel 14 side of the red light source 121 .

A fluorescent plate device 100 that constitutes the green light source device 80 includes a fluorescent plate 101, a motor 110, a condenser lens group 117 on the incident side, and a condenser lens 115 on the exit side. The fluorescent plate 101 is a fluorescent wheel arranged so as to be perpendicular to the optical axis of the light emitted from the excitation light irradiation device 70 . This fluorescent screen 101 is rotationally driven by a motor 110 . Condensing lenses 117 a and 117 b condense a ray bundle of excitation light emitted from the excitation light irradiation device 70 onto the fluorescent screen 101 . Condensing lens 115 condenses the ray bundle emitted from fluorescent plate 101 toward front panel 12 . The fluorescent plate device 100 is arranged above the condenser lens group 117 and the condenser lens 115 . Therefore, a portion of the lower portion of the fluorescent plate 101 is arranged on the optical path of the condenser lens group 117 and the condenser lens 115 .

The fluorescent plate 101 has a fluorescent emission region and a diffusion transmission region arranged side by side in the circumferential direction. The fluorescent light emitting region receives the blue wavelength band light emitted from the blue laser diode 71 as excitation light and emits the excited fluorescent light in the green wavelength band. The diffuse transmission region diffusely transmits the emitted light from the blue laser diode 71 . The emitted light diffusely transmitted is emitted as blue wavelength band light of the optical device 60 .

The light guiding optical system 140 has a first dichroic mirror 141 , a condenser lens 149 , a second dichroic mirror 148 , a first reflection mirror 143 , a condenser lens 146 , a second reflection mirror 145 and a condenser lens 147 . The first dichroic mirror 141 is located at a position where the blue wavelength band light emitted from the excitation light irradiation device 70, the green wavelength band light emitted from the fluorescent plate 101, and the red wavelength band light emitted from the red light source device 120 intersect. placed in The first dichroic mirror 141 transmits blue wavelength band light and red wavelength band light, and reflects green wavelength band light. The optical axis of the green wavelength band light reflected by the first dichroic mirror 141 is turned 90 degrees toward the left panel 15 toward the condenser lens 149 . Therefore, the optical axis of the red wavelength band light transmitted through the first dichroic mirror 141 coincides with the optical axis of the green wavelength band light reflected by the first dichroic mirror 141 .

A condenser lens 149 is arranged on the left panel 15 side of the first dichroic mirror 141 . Both the red wavelength band light transmitted through the first dichroic mirror 141 and the green wavelength band light reflected by the first dichroic mirror 141 enter the condenser lens 149 . The second dichroic mirror 148 is arranged on the left panel 15 side of the condenser lens 149 and on the rear panel 13 side of the condenser lens 147 . The second dichroic mirror 148 reflects red and green wavelength band light and transmits blue wavelength band light. Therefore, the red wavelength band light and the green wavelength band light condensed by the condensing lens 149 are reflected by the second dichroic mirror 148 and converted by 90 degrees toward the rear panel 13 side. A condenser lens 173 is arranged on the rear panel 13 side of the second dichroic mirror 148 . The red wavelength band light and the green wavelength band light reflected by the second dichroic mirror 148 enter the condenser lens 173 .

The first reflecting mirror 143 is arranged on the optical axis of the blue wavelength band light transmitted through the fluorescent plate 101 , that is, between the condenser lens 115 and the front panel 12 . The first reflecting mirror 143 reflects the blue wavelength band light and converts the optical axis of the blue wavelength band light by 90 degrees toward the left panel 15 . The condenser lens 146 is arranged on the left panel 15 side of the first reflecting mirror 143 . Also, the second reflecting mirror 145 is arranged on the left panel 15 side of the condensing lens 146 . The second reflecting mirror 145 converts the optical axis of the blue wavelength band light reflected by the first reflecting mirror 143 and condensed by the condensing lens 146 to the rear panel 13 side by 90 degrees. The condenser lens 147 is arranged on the rear panel 13 side of the second reflecting mirror 145 . The blue wavelength band light reflected by the second reflecting mirror 145 passes through the second dichroic mirror 148 via the condenser lens 147 and enters the condenser lens 173 . In this way, the ray bundles of the respective wavelength band lights of red, green, and blue guided by the light guide optical system 140 are guided onto the same optical path of the light source side optical system 170 .

The light source side optical system 170 includes a condenser lens 173 , a light tunnel 175 such as a light tunnel or a glass rod, a condenser lens 178 , an optical axis conversion mirror 179 , a condenser lens 183 , an irradiation mirror 185 and a condenser lens 195 . In addition, since the condenser lens 195 emits image light emitted from the display element 51 arranged on the rear panel 13 side of the condenser lens 195 toward the projection side optical system 220, the condenser lens 195 is part of the projection side optical system 220. But also.

Each ray bundle emitted from the condensing lens 173 enters the light tunnel 175 . Each ray bundle incident on the light tunnel 175 becomes a ray bundle with uniform intensity distribution by the light tunnel 175 .

An optical axis conversion mirror 179 is arranged via a condensing lens 178 on the optical axis of the light tunnel 175 on the rear panel 13 side. A bundle of rays emitted from the exit port of the light tunnel 175 is condensed by a condensing lens 178 and then converted by an optical axis conversion mirror 179 into an optical axis directed toward a condensing lens 183 .

The ray bundle reflected by the optical axis conversion mirror 179 is condensed by the condensing lens 183 and then irradiated by the irradiation mirror 185 to the display element 51 via the condenser lens 195 at a predetermined angle. A heat sink 190 is provided on the rear panel 13 side of the display element 51 . The display element 51 which is DMD is cooled by this heat sink 190 .

A ray bundle, which is light source light and is irradiated onto the image forming surface of the display element 51 by the light source side optical system 170, is reflected by the image forming surface of the display element 51, and passes through the projection side optical system 220 as projection light onto the screen. projected onto.

The projection-side optical system 220 is composed of a condenser lens 195 , a movable lens group 235 and a fixed lens group 225 . The fixed lens group 225 is built into the fixed lens barrel. The movable lens group 235 is incorporated in a movable lens barrel and is manually or automatically moved to enable zoom adjustment and focus adjustment.

By configuring the projection device 10 in this way, when the fluorescent plate 101 is rotated and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at different timings, light in each wavelength band of red, green, and blue is guided. The light enters the light tunnel 175 via the optical system 140 and further enters the display element 51 via the light source side optical system 170 . Therefore, the DMD, which is the display element 51 of the projection device 10, displays light of each color in a time-division manner according to data, thereby projecting a color image onto the screen.

Here, as shown in FIG. 5, the optical case main body 61a of the optical case 61 is formed in a substantially box shape including a bottom plate 61a1 and side walls 61a2 erected on the outer periphery of the bottom plate 61a1. A large number of optical members in the light guiding optical system 140, the light source side optical system 170, and the like are housed in the optical case main body 61a of the optical case 61. As shown in FIG.

The optical case main body 61 a in this embodiment mainly includes a region in which the light guide optical system 140 and the light source side optical system 170 are accommodated, and a light beam reflected by the optical axis conversion mirror 179 . A region accommodating a condensing lens 183 for guiding light from the light source, a condenser lens 195 arranged between the display element 51 and the projection-side optical system 220, and the like are formed. Covers 61b1 and 61b2 are provided on the top of the optical case main body 61a corresponding to the respective regions (see FIG. 3). On the surfaces of the covers 61b1 and 61b2 of the optical case main body 61a facing the respective optical members, cushion portions made of a cushioning material such as a foam material can be formed corresponding to the respective optical members.

As shown in FIGS. 6 and 7, the optical case main body 61a of the optical case 61 is formed with holding portions 400 and 410 for holding optical members such as the condenser lens CL and the reflecting mirror ML. The holding portions 400 and 410 are formed with a plurality of fixing portions (fixing portions F1, F2, F3) for fixing the optical member with a fixing agent FD, which will be described in detail later. Here, FIGS. 6 and 7 are illustrated so that the bottom plate 61a1 of the optical case main body 61a faces upward.

As shown in FIG. 6, the holding portion 400 for holding the condenser lens CL is concave (as seen from the inside) of the bottom plate 61a1 of the optical case main body 61a (in other words, the case surface P of the bottom plate 61a1). convex) is formed. The holding portion 400 is formed with a peripheral wall 401 extending from the bottom plate 61a1 toward the inner side of the optical case main body 61a so as to have a generally rectangular peripheral shape in a plan view. A support plate 402 is formed across the peripheral wall 401 from the tip of the peripheral wall 401 in parallel with the bottom plate 61a1. A substantially rectangular support plate opening 403 is formed in the center of the support plate 402 .

At the edge of the support plate 402 facing the support plate opening 403, following the circular outline of the condenser lens CL (that is, the outline of the condenser lens CL on the plane perpendicular to the optical axis of the condenser lens CL), An inclined or arcuate support surface 402a is formed. On the other hand, on the outside of the optical case main body 61a corresponding to the support plate opening 403, a beam-shaped support beam 404 is formed. The support beam 404 has an elongated hole 404a formed substantially in the center thereof. The inner surface of the optical case main body 61a in the support beam 404 is formed in a substantially arc shape following the circular outline of the condenser lens CL (that is, the outline of the condenser lens CL around the optical axis of the condenser lens CL). and a supporting surface 404b. A slit 405 is formed by placing both edges of the support beam 404 apart from the support plate opening 403 . As will be described later, the portion of the hole portion 404a corresponding to the outer circumference of the condenser lens CL (in other words, the position closest to the case surface P) is a fixed portion F1 (first fixed portion). Also, the portions of each slit 405 corresponding to the outer circumference of the condenser lens CL are defined as a fixed portion F2 (second fixed portion) and a fixed portion F3 (third fixed portion), respectively. The fixed portions F2 and F3 are arranged to face each other with the fixed portion F1 interposed therebetween. The condenser lens CL is fixed by fixing portions F1, F2, and F3.

Arrangement of the condenser lens CL on the holding part 400 is performed as follows.
First step: Arranging the condensing lens CL (optical member) on the jig 600 .
Here, as shown in FIGS. 6(a) and 6(b), the jig 600 is formed in a substantially block shape and has a concave portion 601 into which the condenser lens CL is inserted. The concave portion 601 is formed with high precision according to the outer shape of the condenser lens CL.

Second step: Positioning the holding portion 400 of the optical case 61 on the condenser lens CL (optical member) arranged on the jig 600 . The positioning of the jig 600 with respect to the optical case 61 (holding portion 400) is performed by placing the leading end surface of the positioning plate 602 standing on the surface of the jig 600 on which the concave portion 601 is formed on the inner surface of the bottom plate 61a1 of the optical case main body 61a. It is performed by contacting. In this case, if the tip surface of the positioning plate 602 of the jig 600 and the portion of the bottom plate 61a1 of the optical case 61 with which this tip surface abuts are processed with high precision, the condensing lens CL can be positioned with respect to the optical case 61 with even higher precision. can be positioned. In addition, a predetermined gap S is formed between the outer periphery of the condenser lens CL and the support surface 402a of the support plate 402 of the holder 400 when the jig 600 is positioned in this step. Similarly, a predetermined gap S is formed between the outer periphery of the condenser lens CL and the support surface 404b of the support beam 404. As shown in FIG.

Third step: A fixing agent FD is applied to the slits 405 and the holes 404a that are formed in the holding part 400 and are a plurality of openings. The slit 405 and the hole 404a are openings that open from the outside to the inside of the optical case 61 . By applying the fixing agent FD to the slit 405 and the hole 404a, the gap S between the outer circumference of the condenser lens CL and the support surface 402a of the support plate 402 and the gap between the outer circumference of the condenser lens CL and the support beam 404 are formed. The fixing agent FD flows into the gap S between the support surface 404b.

Fourth step: curing the fixing agent FD. Here, various curing agents such as ultraviolet curing agents and heat curing agents can be used as the fixing agent FD. As a method for curing the fixing agent FD, any curing method such as curing after a lapse of a predetermined time, ultraviolet curing, or thermal curing can be adopted according to the type of the fixing agent FD.

Fifth step: After curing the fixing agent FD, the jig 600 is removed. The condensing lens CL is fixed to the optical case 61 by curing the fixing agent FD in the fixing portions F1, F2, F3 over the optical case 61 and the condensing lens CL.

Next, with reference to FIGS. 7A and 7B, the case where the rectangular plate-shaped reflecting mirror ML is arranged on the holding portion 410 of the optical case 61 will be described. As with the holding portion 400 shown in FIG. 6, the holding portion 410 is formed on the bottom plate 61a1 of the optical case main body 61a in a concave shape on the case surface P when viewed from the outside, and a peripheral wall 411 and a support plate 412 are formed. A support plate opening 413 is formed inside the support plate 412 . Slits 415 are formed on both edge sides of the support beams 414 provided at positions corresponding to the support plate openings 413 . On the other hand, the support beam 414 is formed with a hole 414a at a position corresponding to the reflecting mirror ML. Fixing portions F1, F2, and F3 that fix the reflecting mirror ML have hole portions 414a and slits 415 at positions corresponding to the reflecting mirror ML.

Then, the placement of the reflecting mirror ML on the holding portion 410 is also performed by using the jig 600 having the concave portion 611 and the positioning plate 612 through the first to fifth steps described above.

In this manner, a plurality of optical members such as the condenser lens and the reflecting mirror in the light guide optical system 140 and the light source side optical system 170 can be easily and precisely fixed by applying the fixing agent FD using the jig 600. It can be fixedly arranged in the optical case 61 . Here, the jig 600 can be integrally formed, for example, in accordance with the shape of the area in which the light guide optical system 140 and the light source side optical system 170 are mainly accommodated in the optical case main body 61a shown in FIG. . The integrally formed jig 600 is provided with recesses (for example, recesses 601 and 610) into which a large number of optical members in the light guiding optical system 140 and the light source side optical system 170 can be inserted, corresponding to the large number of optical members. Then, an optical member is inserted into each recess. After arranging the plurality of optical members on the jig 600, the jig 600 is arranged so as to cover the optical case main body 61a. Then, each optical member is positioned with respect to the holding portion (for example, holding portions 400 and 410) of the optical case main body 61a. After that, each optical member is fixed to the optical case 61 by applying a fixing agent FD to the openings (for example, the holes 404a and 414a and the slits 405 and 415) of the fixing portions (for example, the fixing portions F1 to F3) and curing the fixing agent. be done. By using the jig 600 having a plurality of concave portions corresponding to a plurality of optical members in this manner, application to an automatic assembly machine can be easily performed.

Next, as shown in FIGS. 8A and 8B, after the optical members such as the condenser lens CL are placed in the holding portions 400 and 410 of the optical case 61, the concave portions 61b3 for preventing the optical members from coming off are The optical case 61 and the lid member are fixed by the lid member (cover 61b) formed with . Since the optical member is fixed with the fixing agent FD, a clearance is provided between the recess 61b3 for preventing the optical member from falling off and the optical member. Optical members such as the reflecting mirror ML have the same configuration.

As described above, according to the embodiment of the present invention, the optical device 60 includes a case having a holding portion that holds an optical member. The fixing agent fixes the position and inclination of the optical member with respect to the case. Specifically, the optical device 60 includes an optical case 61 having holding portions 400 and 410 for holding optical members such as a condenser lens CL and a reflecting mirror ML. The holding portions 400 and 410 are fixed to the optical case 61 and the optical members by a fixing agent FD applied through openings (holes 404a and 414a and slits 405 and 415) that open from the outside to the inside of the optical case 61. A plurality of fixed portions F1 to F3 are provided.

As a result, the optical member is fixed with the fixing agent FD, so that the positioning of the optical member with respect to the optical case 61 before applying the fixing agent FD can be easily performed using the jig 600 . Accordingly, it is possible to provide the optical device 60 and the projection device 10 that can easily assemble the optical device and that can accurately fix the optical member at the position positioned by the jig 600 .

In addition, the holding portions 400 and 410 are formed with concave recesses on the case surface P when viewed from the outside of the case (optical case 61), and the recesses have a plurality of openings (holes 404a and 414a, slits 405, 415) is formed. Thereby, when the optical device 60 (optical case 61) is installed in the housing of the projection device 10, interference between the holding portions 400 and 410 and the fixing agent FD can be reduced.

One fixed portion F1 among the fixed portions F1 to F3 is formed at a position closest to the case surface P on the outer periphery of the optical member. As a result, the fixing portions F2 and F3 can be provided symmetrically with respect to the fixing portion F1, so that the optical member can be fixed to the optical case 61 more stably.

In addition, the plurality of fixing portions are arranged to face a first fixing portion, which is a fixing portion F1 formed at a position closest to the case surface P on the outer periphery of the optical member, with the first fixing portion interposed therebetween. The fixing part F2 and the fixing part F3, which are the second fixing part and the third fixing part, are provided. As a result, the fixing portion can be supported at three points, so that the optical member can be fixed with higher precision.

Further, gaps (clearances S) are formed at predetermined intervals between the optical case 61 and the optical members in the fixed portions F1 to F3. As a result, the fixing agent FD can be poured into the gap S, so that the optical member can be fixed to the optical case 61 by applying the fixing agent FD while performing highly accurate positioning using the jig 600 .

A lid member (cover 61b) having recesses 61b3 corresponding to the optical members is provided at a position facing the holding portions 400 and 410 of the optical members. Accordingly, even if the projection device 10 including the optical device 60 is dropped and subjected to impact, the optical member can be held down by the concave portion 61b3, and scattering of the optical member can be reduced.

Further, cushions (cushion portions) corresponding to the optical members can be provided at positions corresponding to the optical members on the covers 61b1 and 61b2, which are positions facing the holding portions 400 and 410. FIG. As a result, even if the optical device 60 receives an impact due to a fall or the like and the fixing by the fixing portions F1, F2, F3 is released and the optical members are detached from the holding portions 400, 410, the optical members are supported by the cushions. Since the optical members are held down, it is possible to prevent the optical members from falling off from the optical case 61 and scattering. Therefore, the cushion part can be provided so as to contact or be close to the optical member. Even if the cushion is not provided, the condensing lens CL and the reflecting mirror ML, which are optical members, are fixed at a plurality of locations by the fixing agent FD applied to the fixing portions F1 to F3 and the holding portion 400 of the optical case 61. , 410, the condensing lens CL and the reflecting mirror ML, which are optical members, will not drop off even if they receive a certain amount of impact.

The method of manufacturing the optical device 60 according to the present embodiment comprises a step (first step) of arranging the optical member on the jig 600 , and attaching the holding portion 400 of the optical case 61 to the optical member arranged on the jig 600 . 410 (second step); and a step of applying a fixing agent FD to a plurality of openings (holes 404a, 414a, slits 405, 415) formed in the holding portions 400, 410 (third step). and a step of curing the fixing agent FD (fourth step). The step of curing the fixing agent FD (fourth step) can be any one of curing over a predetermined period of time, ultraviolet curing, and thermal curing. As a result, it is possible to provide a method of manufacturing an optical device that facilitates the assembly work and improves the accuracy of the fixing position of the optical member.

It should be noted that each embodiment described above is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and its equivalents.

Below, the invention described in the first claim of the present application is added.
[1] A case having a holding portion that holds an optical member,
The holding part fixes the position and inclination of the optical member with respect to the case by a fixing agent applied through a plurality of openings that open from the outside to the inside of the case. Device.
[2] The above-described [1], wherein the holding portion is formed with a recessed portion in a case surface as viewed from the outside of the case, and the plurality of opening portions are formed in the recessed portion. optical device.
[3] The above [1], wherein one of the plurality of fixing portions fixed to the case by the fixing agent is formed at a position closest to the case surface on the outer periphery of the optical member. Or the optical device according to [2] above.
[4] The plurality of fixing portions may include a first fixing portion formed at a position closest to the case surface on the outer periphery of the optical member, and a first fixing portion disposed opposite to each other with the first fixing portion interposed therebetween. The optical device according to [3] above, comprising a second fixing portion and a third fixing portion.
[5] The optical device according to [3] or [4], wherein a gap portion having a predetermined interval is formed between the inner surface of the case and the optical member in the fixed portion. .
[6] Any one of [1] to [5], wherein a lid member having a concave portion corresponding to the optical member is provided at a position facing the holding portion of the optical member. 1. An optical device according to claim 1.
[7] The optical device according to any one of [1] to [5], wherein a cushion portion corresponding to the optical member is provided at a position of the optical member facing the holding portion. .
[8] The optical device according to any one of [1] to [7];
a display element irradiated with light source light from the light source device to form image light;
a projection-side optical system that projects the image light emitted from the display element onto a screen;
a projection device control unit that controls the display element and the light source device;
A projection device comprising:
[9] A method for manufacturing an optical device including a jig, an optical member, and a case having a holding portion with a plurality of openings,
placing the optical member on the jig;
positioning the holder of the case on the optical member placed on the jig;
applying a fixing agent to a plurality of openings formed in the holding part;
curing the fixative;
A method of manufacturing an optical device, comprising:
[10] The method for manufacturing an optical device according to [9], wherein the step of curing the fixing agent is any one of curing over a predetermined period of time, ultraviolet curing, and thermal curing.

10 projection device 10a upper housing 10b lower housing 11 top panel 11a projection image adjustment section 12 front panel 12 panel 12a light output section 12b projection opening 12c height adjustment button 13 rear panel 13 panel 14 panel 14 right panel 15 left panel 15 Panel 19 lens cover 20 terminal 21 input/output connector section 22 input/output interface 23 image conversion section 24 display encoder 25 video RAM 26 display drive section 31 image compression/decompression section 32 memory card 35 Ir reception section 36 Ir processing section 37 key/indicator Section 38 Control Section 41 Light Source Control Circuit 43 Cooling Fan Drive Control Circuit 45 Lens Motor 47 Audio Processing Section 48 Speaker 51 Display Element 60 Optical Device 61 Optical Case (Case)
61a Optical case main body 61a1 Bottom plate 61a2 Side wall 61b Cover 61b1 Cover 61b2 Cover 61b3 Recess 70 Excitation light irradiation device 71 Blue laser diode 73 Collimator lens 74 Holder 76 Reflecting mirror 78 Diffusion plate 80 Green light source device 81 Heat sink 100 Fluorescent plate device 101 Fluorescent plate 110 Motor 115 Condensing lens 117 Condensing lens group 117a Condensing lens 117b Condensing lens 120 Red light source device 121 Red light source 125 Condensing lens group 130 Heat sink 140 Light guiding optical system 141 First dichroic mirror 143 First reflecting mirror 145 Second reflecting mirror 146 condenser lens 147 condenser lens 148 second dichroic mirror 149 condenser lens 170 light source side optical system 173 condenser lens 175 light tunnel 178 condenser lens 179 optical axis conversion mirror 183 condenser lens 185 irradiation mirror 190 heat sink 195 condenser lens 220 projection-side optical system 225 fixed lens group 235 movable lens group 260 intake fan 270 intake fan 280 exhaust fan 301 power supply device 302 control circuit board 310 intake hole 320 intake hole 330 intake hole 340 exhaust hole 400 holding part 401 peripheral wall 402 support plate 402a Supporting surface 403 Supporting plate opening 404 Supporting beam 404a Hole 404b Supporting surface 405 Slit 410 Holding part 411 Peripheral wall 412 Supporting plate 413 Supporting plate opening 414 Supporting beam 414a Hole 415 Slit 501 Corner 503 Corner 504 Corner 600 Jig 601 Recess 602 Positioning plate 610 Recess 611 Recess 612 Positioning plate CL Collecting lenses F1 to F3 Fixing part FD Fixing agent ML Reflecting mirror S Gap P Case surface

Claims (11)

A case having a holding portion that holds the optical member,
When viewed from the outside of the case, the holding portion has a recess formed in the case surface, and a plurality of openings are formed in the recess. The position and inclination of the optical member are fixed with respect to the case by the fixing agent applied by the coating, and the concave portion is located at the bottom of the concave portion. and an upright peripheral wall, wherein the opening is formed in the support plate . 2. The optical system according to claim 1, wherein one of a plurality of fixing portions fixed to said case by said fixing agent is formed at a position closest to said case surface on the outer circumference of said optical member. Device. The plurality of fixing portions include a first fixing portion formed at a position closest to the case surface on the outer circumference of the optical member, and a second fixing portion arranged to face each other with the first fixing portion interposed therebetween. 3. The optical device according to claim 2, further comprising a third fixing portion. 4. The optical device according to claim 2, wherein a gap portion with a predetermined interval is formed between the inner surface of the case and the optical member in the fixed portion. 5. The optical device according to any one of claims 1 to 4, wherein a lid member having a concave portion corresponding to the optical member is provided at a position of the optical member facing the holding portion. Device. 5. The optical device according to any one of claims 1 to 4, wherein a cushion portion is provided corresponding to the optical member at a position of the optical member facing the holding portion. 7. The optical device according to any one of claims 1 to 6, wherein the edge facing the opening of the support plate is inclined or arc-shaped. A beam-shaped support beam is formed substantially in the center of the opening of the support plate of the recess, and a hole is formed substantially in the center of the support beam,
8. The optical device according to claim 1 , wherein a surface of the support beam on the optical member side is formed in a substantially arc shape. an optical device according to any one of claims 1 to 8 ;
a display element irradiated with light source light from a light source device to form image light;
a projection-side optical system that projects the image light emitted from the display element onto a screen;
a projection device control unit that controls the display element and the light source device;
A projection device comprising: A method for manufacturing an optical device, comprising: a jig; an optical member;
The recess is positioned at the bottom of the recess and includes a support plate parallel to the case surface and a peripheral wall erected from the support plate, the support plate being provided with the opening,
placing the optical member on the jig;
positioning the holder of the case on the optical member placed on the jig;
applying a fixing agent to the plurality of openings formed in the holding part;
curing the fixative;
A method of manufacturing an optical device, comprising: 11. The method of manufacturing an optical device according to claim 10 , wherein the step of curing the fixing agent is a curing method selected from curing over a predetermined period of time, ultraviolet curing, and thermal curing.

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