JP7654945B2 - Holding member, light source device, projection device, and method for holding optical member - Google Patents

Description

The present invention relates to a holding member, a light source device, a projection device equipped with this light source device, and a method for holding an optical member.

Projection devices have been proposed that project images formed using a micromirror display element known as a DMD (Digital Micromirror Device) or a liquid crystal panel onto a screen. In the projection device, optical components such as a condenser lens are fixed and arranged using a holding member. As an example of a method for holding a condenser lens, Patent Document 1 discloses a cylindrical lens holding structure that consists of a positioning member that positions the cylindrical lens and a holding member that presses and holds the cylindrical lens. An opening formed in the holding member engages with a claw portion provided on the positioning member, and the cylindrical lens is pressed and held.

JP 2004-157344 A

Depending on the configuration, optical components may require highly accurate positioning in three axial directions and rotational directions around each axis in a three-dimensional coordinate system. In the holding mechanism of Patent Document 1, the front part of the cylindrical lens is supported in the optical axis direction by two pressure pieces that are part of the metal plate. Therefore, it is expected that the cylindrical lens will move in the up-down or left-right direction perpendicular to the optical axis, causing the central axis of the cylindrical lens to become misaligned with the optical axis. For this reason, the holding method of Patent Document 1 may make it difficult to hold optical components with complex shapes.

In view of the above, the present invention aims to provide a holding member, a light source device, a projection device, and a method for holding an optical member that positions the optical member with high precision.

The holding member of the present invention is a holding member for holding an optical member, wherein the optical member has a first abutment portion on a first reference surface side, a convex lens surface protruding from the first abutment portion, and a second abutment portion provided on the outer peripheral edge of the convex lens surface, and is provided with a positioning portion including a first abutment portion that positions a first axial position of the first abutment portion, and a second abutment portion that abuts against the second abutment portion inside an opening in which the convex lens surface is housed, and positions a second axial position and a third axial position of the second abutment portion that intersect with the first axial direction and each other, the second abutment portion being provided in the form of a plurality of ribs and having a curved tip portion that is curved along the second abutment portion .

The present invention provides a holding member that positions an optical member with high precision, a light source device, a projection device, and a method for holding an optical member.

FIG. 2 is a diagram showing functional circuit blocks of the projection device according to the embodiment of the present invention. FIG. 2 is a schematic plan view showing an internal structure of a projection device according to an embodiment of the present invention. 1 is a schematic diagram of a fluorescent wheel according to an embodiment of the present invention, as viewed from the front; 1 is a perspective view of a state in which an optical member is held by a holding member according to an embodiment of the present invention. 1A and 1B are diagrams showing an optical member according to an embodiment of the present invention, in which FIG. 1A is a perspective view and FIG. 1B is a front view seen from the first lens surface side. 1A and 1B are diagrams showing an optical member according to an embodiment of the present invention, in which (a) is a side view seen from the second lens surface side, and (b) is a plan view seen from the upper flat surface side. FIG. 2 is a perspective view of a holding member according to the embodiment of the present invention. 4 is a side view showing a state in which an optical member is positioned in a holding member according to the embodiment of the present invention. FIG. FIG. 1 is a front view showing a state in which an optical member is positioned in a holding member according to an embodiment of the present invention; 11 is a rear view showing a state in which an optical member is positioned in a holding member according to an embodiment of the present invention. FIG. 11 is a cross-sectional view taken along the line XI-XI of the holding member shown in FIG. 10 according to the embodiment of the present invention, illustrating a state in which an optical member is fixed by a fixing member.

The following describes an embodiment of the present invention. FIG. 1 is a functional circuit block diagram of a projection device 10. The projection device control unit includes a CPU including an image conversion unit 23 and a control unit 38, a front-end unit including an input/output interface 22, and a formatter unit including a display encoder 24 and a display drive unit 26. Image signals of various standards input from the input/output connector unit 21 are converted by the image conversion unit 23 via the input/output interface 22 and the system bus SB to be unified into image signals of a predetermined format suitable for display, and then output to the display encoder 24.

In addition, the display encoder 24 expands and stores the input image signal in the video RAM 25, generates a video signal from the contents of the video RAM 25, and outputs it to the display driver 26.

The display driver 26 drives the display element 27, which is a spatial light modulator (SOM), at an appropriate frame rate in response to the image signal output from the display encoder 24. The projection device 10 forms an optical image with the reflected light from the display element 27 by irradiating the light beam emitted from the light source device 60 to the display element 27 via a light guide optical system, and projects and displays the image on a projection target such as a screen (not shown) via the projection optical system 220 (see FIG. 2). The movable lens group 235 of the projection optical system 220 can be driven by a lens motor 29 for zoom adjustment and focus adjustment.

The image compression/expansion unit 31 also performs a recording process in which the luminance signal and color difference signal of the image signal are compressed using processes such as ADCT and Huffman coding, and the data is written sequentially to a memory card 32, which is a removable recording medium. Furthermore, the image compression/expansion unit 31 reads out image data recorded on the memory card 32 in the playback mode, expands each piece of image data constituting a series of moving images on a frame-by-frame basis, and outputs the expanded data to the display encoder 24 via the image conversion unit 23. Thus, the image compression/expansion unit 31 can output moving images, etc., based on the image data stored in the memory card 32.

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

The key/indicator section 37 is composed of a main key and an indicator provided on the housing. Operation signals of the key/indicator section 37 are sent directly to the control section 38. In addition, key operation signals from the remote controller are received by the Ir receiving section 35, demodulated into code signals by the Ir processing section 36, and output to the control section 38.

The control unit 38 is connected to the audio processing unit 34 via the system bus SB. The audio processing unit 34 is equipped with a sound source circuit such as a PCM sound source, and in the projection mode and playback mode, converts audio data into analog form and drives the speaker 39 to emit amplified sound.

The control unit 38 controls the light source control circuit 28. The light source control circuit 28 individually controls the operation of the excitation light irradiation device of the light source device 60 so that light in a specific wavelength band required for image generation is emitted from the light source device 60.

The control unit 38 also causes the cooling fan drive control circuit 33 to detect temperatures using multiple temperature sensors provided in the light source device 60, etc., and controls the rotation speed of a cooling fan (not shown) in the projection device 10 based on the results of this temperature detection. The control unit 38 also controls the cooling fan drive control circuit 33 to continue rotating the cooling fan using a timer or the like even after the power to the projection device 10 body is turned off, or to turn off the power to the projection device 10 body based on the results of temperature detection by the temperature sensors.

Figure 2 is a schematic plan view showing the internal structure of the projection device 10. The projection device 10 includes a light source device 60, a light source side optical system 170, and a projection optical system 220. The projection device 10 also drives a drive section (including an excitation light emitting device 70, a red light source device 120, a fluorescent wheel device 100, a display element 27, etc.) in the light source device 60 that is connected to a circuit board including an internal power supply circuit block, a light source control block, etc.

The light source device 60 includes an excitation light irradiation device 70 that is a light source of blue wavelength band light (light L1) and also an excitation light source, a green light source device 80 that is a light source of green wavelength band light, and a red light source device 120 that is a light source of red wavelength band light. The green light source device 80 is composed of the excitation light irradiation device 70 and a fluorescent wheel device 100.

The light source device 60 is provided with a light guide optical system 140 and a light source side optical system 170 that guide light of each color wavelength band. The light guide optical system 140 guides the light emitted from the excitation light irradiation device 70, the green light source device 80, and the red light source device 120 to the light source side optical system 170.

The excitation light irradiation device 70 is disposed on the rear panel 13 side of the projection device 10. The excitation light irradiation device 70 has a light source group consisting of multiple blue laser diodes 71. The blue laser diodes 71 are semiconductor light-emitting elements, and are disposed so that the optical axis of the emitted light is parallel to that of the red light-emitting diode 121.

The light source group described above is configured by arranging a plurality of blue laser diodes 71 in a matrix. In this embodiment, when the light source group of blue laser diodes 71 is viewed from the left panel 15 side of FIG. 2, the blue laser diodes 71 are arranged in a matrix of two rows and five columns (details not shown). In addition, a collimator lens 73 that converts each of the blue laser diodes 71 into parallel light is arranged on the optical axis of each blue laser diode 71 so as to increase the directivity of the light emitted from the blue laser diode 71. A reflecting mirror group 75 is arranged on the optical axis of each collimating lens 73. The reflecting mirror group 75 converts the optical axis of the blue wavelength band light emitted from each blue laser diode 71 by 90 degrees toward the front panel 12. The heat sink 81 is arranged between the blue laser diode 71 and the right panel 14. In addition, a cooling fan 261 is arranged between the heat sink 81 and the rear panel 13. The blue laser diode 71 is cooled by the cooling fan 261 and the heat sink 81.

The fluorescent wheel device 100 constituting the green light source device 80 is disposed on the optical path of the excitation light emitted from the excitation light irradiation device 70 and in the vicinity of the front panel 12. The fluorescent wheel device 100 includes a fluorescent wheel 101, a motor 110, a condensing lens group 111, and an optical member 4. The fluorescent wheel 101 is disposed so as to be perpendicular to the optical axis of the emitted light from the excitation light irradiation device 70. The motor 110 drives the fluorescent wheel 101 to rotate. The condensing lens group 111 condenses the light beam of the excitation light emitted from the excitation light irradiation device 70 onto the fluorescent wheel 101 and condenses the light beam emitted from the fluorescent wheel 101 toward the rear panel 13. The optical member 4 condenses the light beam emitted from the fluorescent wheel 101 and reflects it toward the condensing lens 146. In addition, a cooling fan 261 is disposed between the motor 110 and the front panel 12, and the fluorescent wheel device 100 and other components are cooled by this cooling fan 261.

Figure 3 is a schematic diagram of the fluorescent wheel 101 as viewed from the front. The fluorescent wheel 101 is formed in a disk or annular shape, and the opening 112 side is connected to the shaft of the motor 110 so as to be rotatable. The fluorescent wheel 101 has a C-ring-shaped fluorescent light-emitting region 310 and an arc-shaped transmission region 320 arranged side by side in the circumferential direction. The fluorescent light-emitting region 310 receives blue wavelength band light emitted from the excitation light irradiation device 70 and focused by the focusing lens group 111 as excitation light, and emits fluorescent light of green wavelength band light. The transmission region 320 transmits or diffuses and transmits the blue wavelength band light emitted from the excitation light irradiation device 70.

The base material 102 of the fluorescent wheel 101 is formed into a disk shape from a metal such as copper or aluminum. The surface 102a of the base material 102 facing the excitation light irradiation device 70 is mirror-finished by silver deposition or the like. A green phosphor layer is laid on this mirror-finished surface 102a to form the fluorescent light-emitting region 310. The transmission region 320 is formed by fitting a transparent base material having transparency into an arc-shaped cutout hole formed in the base material 102. When the transmission region 320 is a region that diffuses and transmits the excitation light, fine irregularities are formed on the surface of the transparent base material by sandblasting or the like.

When the blue wavelength band light emitted from the excitation light irradiation device 70 is irradiated onto the fluorescent light emission region 310 (see, for example, irradiation region S in FIG. 3), the green phosphor in the green phosphor layer is excited, and the fluorescent light emission region 310 emits the green wavelength band light in all directions as fluorescent light. The green wavelength band light is emitted toward the rear panel 13 and enters the condenser lens group 111. Meanwhile, the blue wavelength band light that enters the transmission region 320 passes through or is diffused through the fluorescent wheel 101, and enters the optical member 4 arranged on the rear side of the fluorescent wheel 101 (in other words, the front panel 12 side).

The focusing lens group 111 shown in FIG. 2 focuses the light beam of the blue wavelength band light emitted from the excitation light irradiation device 70 onto the fluorescent wheel 101, and also focuses the fluorescence emitted from the fluorescent wheel 101. The optical member 4 focuses the blue wavelength band light (light L1) that has passed through the fluorescent wheel 101 and is emitted toward the focusing lens 146.

The red light source device 120 includes a red light emitting diode 121, which is a semiconductor light emitting element arranged so that the optical axis of the emitted light is parallel to that of the blue laser diode 71, and a group of focusing lenses 125 that focuses the red wavelength band light emitted from the red light emitting diode 121. The red light source device 120 is arranged so that the optical axis of the red wavelength band light emitted by the red light emitting diode 121 intersects with the optical axis of the green wavelength band light emitted from the fluorescent wheel 101 and reflected by the first dichroic mirror 141. The red light source device 120 is cooled by a heat sink 130 and a cooling fan 261, etc., provided on the right panel 14 side.

The light guide optical system 140 includes a first dichroic mirror 141, a second dichroic mirror 148, a reflecting mirror 145, and a number of focusing lenses 146, 147, and 149 that focus the light beams.

The first dichroic mirror 141 is disposed 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 wheel 101, and the red wavelength band light emitted from the red light source device 120 intersect. The first dichroic mirror 141 transmits the blue and red wavelength band lights and reflects the green wavelength band light. The optical axis of the green wavelength band light emitted from the fluorescent wheel 101 is converted by 90 degrees toward the left panel 15.

The optical element 4 focuses the blue wavelength band light (light L1) incident on the entrance surface (first lens surface 42), reflects it on the reflecting surface 45, and then focuses the blue wavelength band light from the exit surface (second lens surface 43) and emits it toward the focusing lens 146 (see also Figures 5 and 6). The focusing lens 146 is disposed on the left panel 15 side of the optical element 4. The reflecting mirror 145 is disposed on the left panel 15 side of the focusing lens 146. The reflecting mirror 145 converts the optical axis of the blue wavelength band light focused by the focusing lens 146 by 90 degrees toward the rear panel 13 side. The focusing lens 147 is disposed on the rear panel 13 side of the reflecting mirror 145.

The condenser lens 149 is disposed on the left panel 15 side of the first dichroic mirror 141. The optical axis of the red wavelength band light transmitted through the first dichroic mirror 141 is incident on the condenser lens 149. The optical axis of the green wavelength band light reflected by the first dichroic mirror 141 is incident on the condenser lens 149 approximately coinciding with the optical axis of the red wavelength band light.

The second dichroic mirror 148 is disposed 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 wavelength band light and green wavelength band light and transmits blue wavelength band light. Thus, the red wavelength band light and green wavelength band light condensed by the condenser lens 149 are reflected by the second dichroic mirror 148 and enter the condenser lens 173 of the light source side optical system 170. On the other hand, the blue wavelength band light transmitted through the condenser lens 147 passes through the second dichroic mirror 148 and is condensed via the condenser lens 173 to the entrance of a light guide device 175 such as a light tunnel, a glass rod, or a microlens array.

The light source side optical system 170 includes a condenser lens 173, a light guide device 175, a condenser lens 178, an optical axis conversion mirror 181, a condenser lens 183, an irradiation mirror 185, and a condenser lens 195. The condenser lens 195 emits image light emitted from a display element 27 arranged on the rear panel 13 side of the condenser lens 195 toward the projection optical system 220, and is therefore included as part of the projection optical system 220.

The focusing lens 173 arranged near the light-guiding device 175 focuses the light source light onto the entrance of the light-guiding device 175. The red wavelength band light, the green wavelength band light, and the blue wavelength band light are focused by the focusing lens 173 and enter the light-guiding device 175. The light beam that enters the light-guiding device 175 becomes a light beam with a uniform intensity distribution by the light-guiding device 175.

A condenser lens 178 and an optical axis conversion mirror 181 are arranged on the optical axis of the light guide device 175 on the rear panel 13 side. The optical axis of the light beam emitted from the exit of the light guide device 175 is condensed by the condenser lens 178, and then the optical axis is converted by the optical axis conversion mirror 181 to the left panel 15 side.

The light beam reflected by the optical axis conversion mirror 181 is focused by the focusing lens 183, and then projected by the projection mirror 185 through the condenser lens 195 onto the display element 27 at a predetermined angle. The display element 27 in this embodiment is a DMD (digital micromirror device) equipped with multiple micromirror lenses. A heat sink 190 is provided on the rear panel 13 side of the display element 27, and the display element 27 is cooled by this heat sink 190.

The light source light irradiated onto the image forming surface of the display element 27 by the light source side optical system 170 is reflected by the image forming surface of the display element 27 and projected as image light onto the screen via the projection optical system 220. Here, the projection optical system 220 is composed of a condenser lens 195, and a movable lens group 235 and a fixed lens group 225 provided inside the lens barrel. The lens barrel is a variable focus lens, and is formed to allow zoom adjustment and focus adjustment. The movable lens group 235 is formed to be adjustable automatically or manually by the lens motor 29.

By configuring the projection device 10 in this manner, when the fluorescent wheel 101 is rotated synchronously and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at appropriate timing, light in each of the green, blue, and red wavelength bands is incident on the condenser lens 173 via the light guide optical system 140 and is then incident on the display element 27 via the light source side optical system 170. Therefore, the display element 27 displays the light of each color in a time-division manner according to the data, thereby allowing a color image to be projected on the screen.

Figure 4 is a diagram showing the holding member 5 that holds the optical member 4. The holding member 5 holds the condenser lens group 111 and condenser lens 146 shown in Figure 2, and also holds the optical member 4. The fluorescent wheel 101 is disposed in the storage section 57, which is the space provided between the condenser lens group 111 and the optical member 4. The condenser lens group 111 and condenser lens 146 are not shown in Figure 4.

The optical member 4 receives light L1 (blue wavelength band light emitted from the excitation light irradiation device 70) that has passed through the transmission region 320 of the fluorescent wheel 101, and after being reflected by the reflection surface 45, emits it toward the condenser lens 146. The optical member 4 is also a so-called irregular lens having a spherical first lens surface 42 and a cylindrical second lens surface 43 that are convex lens surfaces on each of the entrance side and exit side of the light L1, and can condense the light L1 at each of the first lens surface 42 and the second lens surface 43.

5 and 6, the optical member 4 has a first abutment portion 41, a first lens surface 42, and a second abutment portion 421 on the side of a reference surface S1 (first reference surface) parallel to the ZX plane in an orthogonal coordinate system including an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other. The first abutment portion 41 and the first lens surface 42 are arranged side by side, and the first lens surface 42 is formed in the effective area A1 where the optical path in which the light L1 is incident is located (the approximate position is shown by hatching in FIG. 5(b)). The first abutment portion 41 and the second abutment portion 421 are provided outside the effective area A1. The first abutment portion 41 abuts against a first abutment portion 531 of the holding member 5 described later and is used to position the optical member 4. The first abutment portion 41 is formed in a flat shape. In addition, the first lens surface 42 is formed as a convex lens surface that protrudes spherically from the first abutment portion 41. Therefore, the light L1 irradiated to the first lens surface 42 has its X-axis and Z-axis components focused and enters the inside of the optical member 4.

The second abutment portion 421 is the boundary between the first abutment portion 41 and the first lens surface 42, and is formed on the arc-shaped outer edge of the first lens surface 42. The second abutment portion 421 abuts against a second abutment portion 533 of the holding member 5, which will be described later, and is used to position the optical member 4.

The optical member 4 also has a curved second lens surface 43 on the side of the reference surface S2 parallel to the YZ plane (in other words, on the side of a surface that intersects perpendicularly to the reference surface S1). The second lens surface 43 is formed as a cylindrical lens having a convex cylindrical surface curved around a cylindrical central axis (not shown) parallel to the Y axis (in other words, parallel to the central axis Y1 of the first lens surface 42). This cylindrical surface is formed perpendicular to the ZX plane. Therefore, the light L1 emitted from the second lens surface 43 has a component in the Z axis direction focused. As shown in FIG. 6(a), an effective area A2 is formed inside the height direction (Z axis direction) of the second lens surface 43, where the optical path from which the light L1 is emitted is located (the approximate position is shown by hatching).

The optical member 4 has a third abutment portion 44 on a reference surface S3 (second reference surface) that is parallel to the reference surface S2 (perpendicular to the reference surface S1) and located on the opposite side of the second lens surface 43. The third abutment portion 44 is formed in a flat surface parallel to the YZ plane. The third abutment portion 44 is provided on the first lens surface 42 side in the Y axis direction and is formed with an area smaller than that of the cylindrical second lens surface 43.

6B, the optical member 4 has a reflecting surface 45 on the rear side opposite to the first lens surface 42, which is inclined with respect to the reference surface S1, the reference surface S2, and the reference surface S3. The reflecting surface 45 is formed perpendicular to the XY plane. The reflecting surface 45 is formed in a slightly convex curved shape (in other words, in a concave curved shape with respect to the inside of the optical member 4 where the light L1 is irradiated) by applying a reflective coating to the outer surface of the optical member 4. The reflecting surface 45 reflects the light L1 incident from the first lens surface 42 inside the optical member 4 and guides it to the second lens surface 43 side. The light L1 reflected by the reflecting surface 45 has its component in the Y-axis direction focused. In addition, flat surfaces 46, 47 parallel to the XY plane are formed on the upper and lower surfaces of the optical member 4 in the Z-axis direction.

7 includes a lens holder 51 that holds the condenser lens group 111 shown in FIG. 2, and a lens holder 52 that holds the optical member 4 and the condenser lens 146. The lens holder 51 arranges each condenser lens that constitutes the condenser lens group 111 so that the optical axis is parallel to the Y-axis direction. The lens holder 51 also has an opening 511 that transmits the light L1 emitted from the condenser lens group 111 to the lens holder 52 side. Fixing parts 55 and 56 that can fix the holder 5 to the internal case (not shown) of the light source device 60 are formed on the upper part of the lens holder 51 and the lens holder 52. In addition, a storage part 57 that is a space in which a part of the fluorescent wheel 101 shown in FIG. 2 is arranged is provided between the lens holder 51 and the lens holder 52.

The lens holding section 52 includes a positioning section 53 formed in a plate shape substantially parallel to the ZX plane, and an emission-side support plate section 54 connected to the positioning section 53 and formed in a plate shape substantially parallel to the YZ plane. The positioning section 53 is formed shorter in the top and bottom than the support plate section 54. An upper plate 521 and a lower plate 522 are provided on the top and bottom of the positioning section 53, respectively, and are connected to the inner surface 541 side of the support plate section 54. The upper plate 521 and the lower plate 522 are formed parallel to the XY plane. Therefore, the lens holding section 52 is formed with a box-shaped section that is open on the X-axis positive side and the Y-axis positive side.

The positioning portion 53 has a first abutment portion 531, which is a flat surface parallel to the ZX plane. An opening optical path portion 532 (opening) that is a cutout portion cut into a U-shape is formed in a part of the positioning portion 53. The opening optical path portion 532 is opened to a size that allows the light L1 emitted from the condenser lens group 111 side to pass through. The inner edge of the opening optical path portion 532 is formed so as to be approximately parallel to the arc-shaped outer periphery edge (second abutment portion 421) of the first lens surface 42 when the optical member 4 is housed in the positioning portion 53 (see FIG. 9). Note that the opening optical path portion 532 is not limited to a configuration in which a part of the positioning portion 53 is cut out, and may be formed as a through hole that penetrates in a shape such as a circle.

The opening optical path portion 532 has a rib-shaped second abutment portion 533 that protrudes inward from the inner surface 532a. The second abutment portion 533 is provided in multiple locations (two locations in this embodiment) and stands approximately vertically inward from the inner surface 532a at the same height. The second abutment portion 533 has an abutment surface 533a at its tip that is curved to have the same diameter as the second abutment portion 421 and can abut against the second abutment portion 421. As shown in the enlarged cross-sectional view of part P in FIG. 9, the abutment surface 533a is formed perpendicular to the first abutment portion 531. The abutment surface 533a of the second abutment portion 533 can abut against the second abutment portion 421 by a corner portion 533b on the optical member 4 side. When the second abutment portion 533 is provided in a flat surface shape, the second abutment portion 533 and the second abutment portion 421 are in approximately point abutment. The second contact portions 533 are formed so that their length in the Y-axis direction is approximately the same as that of the inner surface 532a.

Returning to FIG. 7, the support plate portion 54 is formed with an inner surface 541, which is a cylindrical curved surface perpendicular to the ZX plane and recessed toward the negative side of the X axis. The inner surface 541 is formed with an opening optical path portion 543, which is a through hole penetrating in the X axis direction. The opening optical path portion 543 can transmit light of the effective area A2 on the reference surface S2. Note that the opening optical path portion 543 is not limited to being a through hole, and may be provided as a cutout portion.

The support plate 54 has a lens holder 58 that holds the focusing lens 146 shown in FIG. 2 on the surface opposite the inner surface 541. The end of the support plate 54 (the end on the positive Y-axis direction side) is formed flat and substantially parallel to the ZX plane, and has positioning protrusions 591 and female threads 592 on the top and bottom, respectively. The positioning protrusions 591 are provided inside the upper and lower female threads 592.

Returning to FIG. 4, a fixing member 6 is attached to the holding member 5, which presses and fixes the optical member 4 positioned by the positioning portion 53 and the support plate portion 54. The fixing member 6 has an attachment portion 61 that is fixed to the holding member 5, and a pressing portion 62 that presses the optical member 4 toward the first abutment portion 531 and the second abutment portion 533. The fixing member 6 is formed from a metal plate.

The mounting portion 61 is formed in the shape of an elongated rectangular plate and has positioning holes 611, 612. One positioning hole 611 is a round hole, and the other positioning hole 612 is formed in the shape of an elongated hole. A cylindrical positioning protrusion 591 formed on the support plate portion 54 is inserted into each positioning hole 611, 612 to determine the mounting position of the fixing member 6. In addition, a screw hole 613 (detailed shape not shown) is formed in the mounting portion 61. The fixing member 6 is fixed to the holding member 5 by fastening a screw 63 inserted through the screw hole 613 to the female screw portion 592.

The pressing portion 62 is formed in the shape of a long rectangular plate that is bent and extended from the mounting portion 61. When the fixing member 6 is fixed to the holding member 5, the pressing portion 62 extends toward the positioning portion 53. The pressing portion 62 is formed in the shape of a cantilever leaf spring connected to the mounting portion 61 as a fulcrum. The tip of the pressing portion 62 is folded back in the direction away from the positioning portion 53 and the support plate portion 54. Therefore, a convex contact portion 621 is formed at the tip of the pressing portion 62 on the optical member 4 side shown in FIG. 4.

Next, the positioning method of the optical member 4 will be described mainly with reference to Figs. 8 to 11. The optical member 4 of this embodiment is arranged so that the optical axis of the light L1 from the fluorescent wheel 101 (or the condenser lens group 111) side is located on the central axis Y1 of the first lens surface 42, which is a spherical convex lens. The central axes of the condenser lens group 111 and the condenser lens 146 are arranged so that they are parallel to the XY plane and perpendicular to each other. Therefore, the optical member 4 is arranged so that the optical axis of the light L1 incident from the first lens surface 42 is converted by 90 degrees by the reflecting surface 45 to be parallel to the XY plane and emitted from the second lens surface 43. The central axis X1 of the second lens surface 43 is arranged so as to coincide with the central axis of the condenser lens 146.

Therefore, when the optical member 4 is held by the holding member 5, high positioning accuracy is required for six degrees of freedom: (1) height position (Z-axis position), (2) left-right position (X-axis position), (3) front-rear position (Y-axis position), (4) front angle position (angle θy position around the Y-axis), (5) tilt angle (angle θx position around the X-axis), and (6) horizontal angle (angle θz position around the Z-axis).

As shown in FIG. 8, the optical member 4 is positioned by first abutting the first abutment portion 41 of the optical member 4 against the first abutment portion 531. The first abutment portion 41 and the first abutment portion 531 are each formed flat, so they abut against each other. Therefore, the first abutment portion 41 is positioned in the Y-axis direction (first axis direction position) parallel to the ZX plane. As a result, the optical member 4 is positioned in the Y-axis direction (the aforementioned (3) front-rear direction position), and the angle θx position around the X-axis and the angle θz position around the Z-axis (the aforementioned (5) tilt angle and (6) horizontal angle) are positioned. The first lens surface 42, which is a convex lens, is positioned within the opening optical path portion 532.

9, the second abutment portion 421 is abutted against the abutment surface 533a of the rib-shaped second abutment portion 533. In this embodiment, the abutment surface 533a is formed in a curved shape perpendicular to the first abutment portion 531, so that the second abutment portion 421 and the corner portion 533b of the second abutment portion 533 are in approximate linear abutment along the outer periphery of the first lens surface 42. Therefore, the X-axis position (second axial position) and Z-axis position (third axial position) of the optical member 4 (the above-mentioned (2) left-right position and (1) height position) are positioned. The optical member 4 is positioned by the first abutment portion 531 and the second abutment portion 533 of the positioning portion 53 so that the optical axis of the light L1 emitted from the condenser lens group 111 (or the fluorescent wheel 101) and the central axis Y1 of the first lens surface 42 approximately coincide with each other.

10, the optical member 4 is biased in the adjustment direction D1 (negative direction of the X-axis) indicated by the dashed line by pressing the third contact portion 44 with an appropriate jig (not shown). At this time, the third contact portion 44 is adjusted so as to be parallel to the YZ plane, and the angle θy position around the Y-axis (the aforementioned (4) front angle) is positioned. This allows the central axis of the second lens surface 43 (i.e., the optical axis of the light L1 emitted from the second lens surface 43) to be approximately aligned with the central axis of the focusing lens 146 (see FIG. 2).

11, the optical member 4 can be fixed by the fixing member 6 in a state where it is positioned by the positioning portion 53. The optical member 4 is held in a state where it is biased toward the first abutment portion 531 and the second abutment portion 533 by the pressing portion 62 of the fixing member 6. Therefore, the optical member 4 can be stably arranged in the light source device 60 in a state where it is positioned with high accuracy in the six degrees of freedom described above. The position of the abutment portion 621 that abuts against the optical member 4 is closer to the second abutted portion 421 (X-axis positive direction side) than the second abutment portion 533. Therefore, the optical member 4 is formed so that it is difficult to roll toward the second lens surface 43 even when pressed by the pressing portion 62. In this way, since the optical member 4 is stably supported, the position and posture of the optical member 4 can be maintained and light can be stably guided even if vibration is applied to the light source device 60 or the projection device 10 equipped with the light source device 60. In addition, the optical member 4 has a first lens surface 42, a second lens surface 43, and a reflecting surface 45 that collects light, and a reflecting surface 45 that changes the direction of the optical axis, and has multiple functions in one member. Therefore, the number of parts can be reduced, and the light source device 60 and the projection device 10 can be made smaller.

Before the first contact portion 41 and the first contact portion 531 are brought into contact with each other, adhesive G (see FIG. 11) can be applied to one or both of the first contact portion 41 and the first contact portion 531 in advance. This allows the first contact portion 41 and the first contact portion 531 to be bonded together while the third contact portion 44 is being biased in the adjustment direction D1 by the jig, thereby fixing the position of the optical member 4. The adhesive G can be used as a temporary fastener that suppresses rotation of the angle θy position around the Y axis when fixed by the fixing member 6, but the optical member 4 may use the adhesive G as a fixing member without using the fixing member 6.

The optical member 4 and the holding member 5 may be fixed to each other by the fixing member 6 without using the adhesive G. In this case, the process of applying the adhesive G can be simplified and the working time can be shortened. The fixing member is not limited to the fixing member 6 and adhesive G described in this embodiment, and other means for fixing the optical member 4 may be used.

In addition, in this embodiment, a configuration has been described in which the optical member 4 is positioned in a Cartesian coordinate system in which the X-axis, Y-axis, and Z-axis are mutually orthogonal, but the holding member 5 and fixing member 6 may also position the optical member 4 with six degrees of freedom in a coordinate system in which the X-axis, Y-axis, and Z-axis intersect without being mutually orthogonal (for example, an oblique coordinate system in which all or a set of the three axes intersect obliquely).

In addition, in the description of this embodiment, the first contact portion 531 has been described as a flat surface, but for example, a configuration in which a recess or multiple protrusions are provided in a portion of the first contact portion 531 may be used. Even in this case, the portion of the first contact portion 531 that contacts the first contacted portion 41 of the optical element 4 is composed of multiple (e.g., three or more) protrusions arranged in a flat shape, so that the first contact portion 531 of the optical element 4 can be easily positioned in the Y-axis direction while being parallel to the ZX plane.

As described above, the optical member 4 described in the embodiment of the present invention has a first abutment portion 41 on the first reference surface (S1) side, a convex lens surface (42) protruding from the first abutment portion 41, and a second abutment portion 421 provided on the outer periphery of the convex lens surface (42). The holding member 5 also has a positioning portion 53 including a first abutment portion 531 that positions the first axial position of the first abutment portion 41, and a second abutment portion 533 that abuts against the second abutment portion 421 inside the opening (532) in which the convex lens surface (42) is housed, and positions the second axial position and the third axial position that intersect with the first axial direction of the second abutment portion 421. When the optical member 4 is attached, the third abutment portion 44 can be easily adjusted to be parallel to the YZ plane by pressing it.

This allows the optical member 4 to be stably fixed with respect to the holding member 5 with respect to six degrees of freedom: (1) height direction position (Z-axis direction position), (2) left/right direction position (X-axis direction position), (3) front/rear direction position (Y-axis direction position), (4) front angle position (angle θy position around the Y-axis), (5) tilt angle (angle θx position around the X-axis), and (6) horizontal angle (angle θz position around the Z-axis). Therefore, the holding member 5 can position the optical member 4 with high precision.

The second contact portion 533 is formed in the form of multiple ribs, and has a curved tip that curves along the second contacted portion 421. The dimensional accuracy of the rib-shaped second contact portion 533 can be relatively easily increased compared to a curved contact portion, so the optical element 4 can be easily positioned even when the optical element 4 is positioned by contacting the curved second contacted portion 421, such as the outer peripheral edge of the convex lens surface (42).

The first reference surface (S1) and the second reference surface (S3) that intersects with it are arranged perpendicularly, and the first contact portion 531 is a flat surface perpendicular to the first axial direction. The tip portion is arranged perpendicular to the first contact portion 531. This allows the first contacted portion 41 to be easily positioned, and the optical element 4 can be easily held even if the optical element 4 has a functional part on a surface other than the first reference surface (S1) or the second reference surface (S3).

The optical element 4 also has a third abutment portion 44 provided on the side of the second reference plane (S3) that intersects with the first reference plane (S1), and the third abutment portion 44 is provided in a flat surface shape. The holding member 5 can easily adjust the angle θy position of the optical element 4 around the Y axis.

The optical element 4 also has a cylindrical surface on the side opposite to the third contact portion 44 provided on the second reference surface (S3) side intersecting with the first reference surface (S1), and has a reflecting surface 45 that reflects the light incident from the convex lens surface (42) onto the cylindrical surface. This allows the optical element 4 to focus the incident light while converting the optical axis in a direction different from the incident direction and outputting the light.

In addition, the holding member 5, in which the flat first abutment portion 41 and the flat second abutment portion 421 are provided outside the effective area A1 of the optical path on the first reference surface (S1), can prevent the light guided by the optical member 4 from being blocked by holding the optical member 4.

The holding member 5 has a fixing member 6 that fixes the optical element 4, and the fixing member 6 biases and fixes the optical element 4 to the first contact portion 531 side and the second contact portion 533 side. Since the holding member 5 fixes the optical element 4 while abutting it against the portion that serves as the reference for positioning, the holding state of the optical element 4 can be easily maintained with the optical element 4 positioned.

In addition, the light source device 60 and the projection device 10, which are equipped with a light source (excitation light irradiation device 70 in this embodiment), an optical member 4 onto which light L1 emitted from the light source is incident, and the above-mentioned holding member 5 that supports the optical member 4, can prevent the optical member 4 from shifting in position even if vibrations or the like are applied to the housing, because the holding member 5 can stably position the optical member 4 with high precision. In addition, the number of optical members can be reduced by configuring the optical member 4 to have multiple optical functions, and the light source device 60 and the projection device 10 can be made smaller overall.

The above-mentioned holding method of the optical member 4 by the holding member 5 is configured to position the first axial position of the first abutted portion 41 by the first abutting portion 531, and to position the second axial position and the third axial position that intersect with the first axial position of the second abutted portion 421 by abutting with the second abutting portion 533. As a result, the optical member 4 is stably fixed with respect to the holding member 5 with respect to six degrees of freedom: (1) height direction position (Z-axis direction position), (2) left-right direction position (X-axis direction position), (3) front-rear direction position (Y-axis direction position), (4) front angle position (angle θy position around the Y-axis), (5) tilt angle (angle θx position around the X-axis), and (6) horizontal angle (angle θz position around the Z-axis). Therefore, the holding member 5 can position the optical member 4 with high precision.

The above-described embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are included in the scope of the invention and its equivalents as set forth in the claims.

The invention described in the first claim of this application is set forth below.
[1] A holding member for holding an optical member,
the optical member has a first abutment portion on a first reference surface side, a convex lens surface protruding from the first abutment portion, and a second abutment portion provided on an outer circumferential edge of the convex lens surface,
a positioning portion including a first abutment portion that positions a first axial position of the first abutted portion, and a second abutment portion that abuts against the second abutted portion inside an opening in which the convex lens surface is housed, and positions a second axial position and a third axial position of the second abutted portion that intersect with each other along the first axial direction;
A holding member comprising:
[2] The holding member described in [1], wherein the second contact portion is provided in the form of a plurality of ribs and has a curved tip portion that is curved along the second contacted portion.
[3] A second reference plane intersecting the first reference plane is provided perpendicularly,
The first contact portion is a flat surface perpendicular to the first axis direction,
The tip portion is provided perpendicular to the first abutment portion.
The holding member according to [2] above.
[4] The optical member has a third abutment portion provided on a second reference surface side intersecting with the first reference surface,
The holding member according to any one of [1] to [3], wherein the third contact portion is provided in a flat surface shape.
[5] The holding member described in any of [1] to [4], characterized in that the optical element has a cylindrical surface on the opposite side to a third abutment portion provided on a second reference surface side that intersects with the first reference surface, and has a reflective surface that reflects light incident from the convex lens surface onto the cylindrical surface.
[6] A holding member described in any of [1] to [5], characterized in that the flat first abutment portion and the flat second abutment portion are provided outside the effective area of the optical path on the first reference surface.
[7] A fixing member for fixing the optical member,
The holding member described in any one of [1] to [6], wherein the fixing member biases and fixes the optical member toward the first contact portion and the second contact portion.
[8] A light source, an optical member into which the light emitted from the light source is incident, and a holding member that supports the optical member,
the optical member has a first abutment portion on a first reference surface side, a convex lens surface protruding from the first abutment portion, and a second abutment portion provided on an outer circumferential edge of the convex lens surface,
The holding member is
a positioning portion including a first abutment portion that positions a first axial position of the first abutted portion, and a second abutment portion that abuts against the second abutted portion inside an opening in which the convex lens surface is housed, and positions a second axial position and a third axial position of the second abutted portion that intersect with the first axial position of the second abutted portion,
A light source device characterized by:
[9] The light source device according to [8],
a display element that is irradiated with light from the light source device and forms image light;
a projection optical system that projects the image light emitted from the display element onto a screen;
A control unit that controls the display element and the light source device;
A projection device comprising:
[10] A method for holding an optical member by a holding member, comprising the steps of:
the optical member has a first abutment portion on a first reference surface side, a convex lens surface protruding from the first abutment portion, and a second abutment portion provided on an outer circumferential edge of the convex lens surface,
The holding member is
a positioning portion including a first contact portion and a second contact portion provided on an inner side of an opening portion in which the convex lens surface is accommodated;
Equipped with
The first abutting portion determines a first axial position of the first abutted portion,
the second abutting portion abuts against the second abutted portion to determine a second axial position and a third axial position of the second abutted portion that intersect with each other along the first axial direction;
A holding method comprising:

4 Optical member 5 Holding member 6 Fixing member 10 Projection device 12 Front panel 13 Rear panel 14 Right panel 15 Left panel 21 Input/output connector section 22 Input/output interface 23 Image conversion section 24 Display encoder 25 Video RAM 26 Display drive section 27 Display element 28 Light source control circuit 29 Lens motor 31 Image compression/expansion section 32 Memory card 33 Cooling fan drive control circuit 34 Audio processing section 35 Ir receiving section 36 Ir processing section 37 Key/indicator section 38 Control section 39 Speaker 41 First contact section 42 First lens surface 43 Second lens surface 44 Third contact section 45 Reflecting surface 46 Flat surface 47 Flat surface 51 Lens holding section 52 Lens holding section 53 Positioning section 54 Support plate section 55 Fixing section 56 Fixing section 57 Storage section 58 Lens holding section 60 Light source device 61 Mounting portion 62 Pressing portion 63 Screw 70 Excitation light irradiation device 71 Blue laser diode 73 Collimator lens 75 Reflecting mirror group 80 Green light source device 81 Heat sink 100 Fluorescent wheel device 101 Fluorescent wheel 102 Base material 102a Surface 110 Motor 111 Condenser lens group 112 Opening 120 Red light source device 121 Red light emitting diode 125 Condenser lens group 130 Heat sink 140 Light guiding optical system 141 First dichroic mirror 145 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 guiding device 178 Condenser lens 181 Optical axis conversion mirror 183 Condenser lens 185 Irradiation mirror 190 Heat sink 195 Condenser lens 220 Projection optical system 225 Fixed lens group 235 Movable lens group 261 Cooling fan 310 Fluorescent light emitting region 320 Transmitting region 421 Second abutted portion 511 Opening 521 Upper plate 522 Lower plate 531 First abutment portion 532 Opening optical path portion 532a Inner surface 533 Second abutment portion 533a Abutment surface 533b Corner portion 541 Inner surface 543 Opening optical path portion 591 Positioning protrusion 592 Female screw portion 611 Positioning hole 612 Positioning hole 613 Screw hole 621 Abutment portion A1 Effective area A2 Effective area D1 Adjustment direction G Adhesive L1 Light S Irradiation region S1 Reference surface (first reference surface) S2 Reference surface S3 Reference plane (second reference plane) SB System bus X1 Central axis Y1 Central axis θx Angle θy Angle θz Angle

Claims (9)

A holding member for holding an optical member,
the optical member has a first abutment portion on a first reference surface side, a convex lens surface protruding from the first abutment portion, and a second abutment portion provided on an outer circumferential edge of the convex lens surface,
a positioning portion including a first abutment portion that positions a first axial position of the first abutted portion, and a second abutment portion that abuts against the second abutted portion inside an opening in which the convex lens surface is housed, and positions a second axial position and a third axial position of the second abutted portion that intersect with each other along the first axial direction;
Equipped with
A holding member characterized in that the second abutment portion is provided in the form of a plurality of ribs and has a curved tip portion that is curved along the second abutted portion. A second reference plane intersecting the first reference plane is perpendicular to the first reference plane,
The first contact portion is a flat surface perpendicular to the first axis direction,
The tip portion is provided perpendicular to the first contact portion.
The holding member according to claim 1 . A holding member for holding an optical member,
the optical member has a first abutment portion on a first reference surface side, a convex lens surface protruding from the first abutment portion, a second abutment portion provided on an outer circumferential edge of the convex lens surface, and a third abutment portion provided on a second reference surface side intersecting with the first reference surface, the third abutment portion being provided in a flat surface shape,
a positioning portion including a first abutment portion that positions a first axial position of the first abutted portion, and a second abutment portion that abuts against the second abutted portion inside an opening in which the convex lens surface is housed, and positions a second axial position and a third axial position of the second abutted portion that intersect with each other along the first axial direction;
Equipped with
A holding member characterized in that the second abutment portion is provided in the form of a plurality of ribs and has a curved tip portion that is curved along the second abutted portion . A holding member for holding an optical member,
the optical member has a first abutment portion on a first reference surface side, a convex lens surface protruding from the first abutment portion, a second abutment portion provided on an outer circumferential edge of the convex lens surface, and a cylindrical surface on the opposite side to the third abutment portion provided on a second reference surface side intersecting with the first reference surface, and has a reflective surface that reflects light incident from the convex lens surface onto the cylindrical surface;
a positioning portion including a first abutment portion that positions a first axial position of the first abutted portion, and a second abutment portion that abuts against the second abutted portion inside an opening in which the convex lens surface is housed, and positions a second axial position and a third axial position of the second abutted portion that intersect with each other along the first axial direction;
Equipped with
A holding member characterized in that the second abutment portion is provided in the form of a plurality of ribs and has a curved tip portion that is curved along the second abutted portion . 5. The holding member according to claim 1 , wherein the first contact portion and the second contact portion are flat and are provided outside an effective area of the optical path on the first reference surface. a fixing member for fixing the optical member;
6. The holding member according to claim 1 , wherein the fixing member biases and fixes the optical member toward the first contact portion and the second contact portion. a light source; an optical member to which the light emitted from the light source is incident; and a holding member that supports the optical member;
the optical member has a first abutment portion on a first reference surface side, a convex lens surface protruding from the first abutment portion, and a second abutment portion provided on an outer circumferential edge of the convex lens surface,
The holding member is
a positioning portion including a first abutment portion that positions a first axial position of the first abutment portion, and a second abutment portion that abuts against the second abutment portion inside an opening that houses the convex lens surface and positions a second axial position and a third axial position of the second abutment portion that intersect with each other along the first axial direction,
The second contact portion is provided in the form of a plurality of ribs and has a curved tip portion curved along the second contacted portion.
A light source device characterized by: The light source device according to claim 7 ;
a display element that is irradiated with light from the light source device and forms image light;
a projection optical system that projects the image light emitted from the display element onto a screen;
A control unit that controls the display element and the light source device;
A projection device comprising: A method for holding an optical member by a holding member, comprising the steps of:
the optical member has a first abutment portion on a first reference surface side, a convex lens surface protruding from the first abutment portion, and a second abutment portion provided on an outer circumferential edge of the convex lens surface,
The holding member is
a positioning portion including a first contact portion and a second contact portion provided on an inner side of an opening portion in which the convex lens surface is accommodated;
Equipped with
The second contact portion is provided in a shape of a plurality of ribs and has a curved tip portion curved along the second contacted portion,
The first abutting portion determines a first axial position of the first abutted portion,
the second abutting portion abuts against the second abutted portion to determine a second axial position and a third axial position of the second abutted portion that intersect with each other along the first axial direction;
A holding method comprising:

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