Holding member, light source device, projection device, and method for holding optical member

Abstract

To provide a holding member that precisely determines the position of an optical member, a light source device, a projection device, and a method for holding an optical member.SOLUTION: An optical member 4 includes: a first contact target part 41 near a first reference surface; a convex lens surface (42) protruding from the first contact target part 41; and a second contact target part 421 provided in the outer periphery of the convex lens surface (42). The holding member 5 has a positioning part 53 including a first contact part 531 and a second contact part 533, the first contact part determining the position of the first contact target part 41 in a first axial direction and the second contact part determining the position in a second axial direction and the position in a third axial direction, which are in contact with the second contact target part 421 and intersect with the first axial direction of the second contact target part 421, in the inner side of an opening unit (532) in which the convex lens surface (42) is contained.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a holding member, a light source device, a projection device including the light source device, and a method for holding an optical member. [Background technology]

[0002] Conventionally, a projection device has been proposed that projects an image formed using a micromirror display element called a DMD (Digital Micromirror Device) or a liquid crystal panel onto a screen. In the projection device, optical members such as a condenser lens are fixed and arranged by a holding member. As an example of a method for holding a condenser lens, Patent Document 1 discloses a cylindrical lens holding structure that includes 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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-157344 A Summary of the Invention [Problem to be solved by the invention]

[0004] 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 a 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 a misalignment between the central axis of the cylindrical lens and the optical axis. For this reason, the holding method of Patent Document 1 may have difficulty holding optical components with complex shapes.

[0005] In view of the above, an object of the present invention is to provide a holding member for positioning an optical member with high precision, a light source device, a projection device, and a method for holding an optical member. [Means for solving the problem]

[0006] The holding member of the present invention is a holding member for holding an optical member, the optical member having a first abutted portion on a first reference surface side, a convex lens surface protruding from the first abutted portion, and a second abutted portion provided on an outer circumferential edge of the convex lens surface, and comprising a positioning portion including: a first abutted portion that positions a first axial position of the first abutted portion; and a second abutted 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 direction and each other. 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. It is characterized by the above. Effect of the Invention

[0007] According to the present invention, it is possible to provide a holding member for positioning an optical member with high precision, a light source device, a projection device, and a method for holding an optical member. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a diagram showing functional circuit blocks of the projection device according to the embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic plan view showing the internal structure of a projection device according to an embodiment of the present invention. [Diagram 3] 1 is a schematic diagram of a fluorescent wheel according to an embodiment of the present invention, as viewed from the front. [Figure 4] 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. [Diagram 5] 1A and 1B are diagrams showing an optical member according to an embodiment of the present invention, in which (a) is a perspective view and (b) is a front view seen from the first lens surface side. [Figure 6]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. [Figure 7] FIG. 2 is a perspective view of a holding member according to the embodiment of the present invention. [Figure 8] 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. [Figure 9] 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; [Figure 10] 10 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. [Figure 11] 11 is a cross-sectional view of the holding member shown in FIG. 10 taken along the line XI-XI, illustrating a state in which an optical member is fixed by a fixing member according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described. 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 driver 26. Image signals of various standards input from an input / output connector unit 21 are converted by the image conversion unit 23 via the input / output interface 22 and the system bus SB so as to be unified into image signals of a predetermined format suitable for display, and then output to the display encoder 24.

[0010] Furthermore, the display encoder 24 develops and stores the input image signal in a video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to a display driver .

[0011] 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 onto 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 a 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.

[0012] Moreover, the image compression / expansion unit 31 performs a recording process in which the luminance signal and the color difference signal of the image signal are compressed by 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 the 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.

[0013] The control unit 38 is responsible for controlling the operation of each circuit in the projection device 10, and is composed of a CPU, a ROM in which operating programs such as various settings are permanently stored, a RAM used as a work memory, and the like.

[0014] The key / indicator section 37 is composed of a main key and an indicator provided on the housing. An operation signal of the key / indicator section 37 is directly sent to the control section 38. In addition, a key operation signal from the remote controller is received by the Ir receiving section 35, demodulated into a code signal by the Ir processing section 36, and output to the control section 38.

[0015] The control unit 38 is connected to the audio processing unit 34 via a system bus SB. The audio processing unit 34 includes a sound source circuit such as a PCM sound source, and converts audio data into analog form in the projection mode and the playback mode, and drives a speaker 39 to emit amplified sound.

[0016] 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 irradiating devices of the light source device 60 so that light in a predetermined wavelength band required for image generation is emitted from the light source device 60.

[0017] Furthermore, the control unit 38 causes the cooling fan drive control circuit 33 to detect temperatures using a plurality of 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 supply to the projection device 10 main body is turned off, or to turn off the power supply to the projection device 10 main body based on the results of temperature detection by the temperature sensors.

[0018] 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 drives a driving section (including an excitation light irradiating 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.

[0019] The light source device 60 includes an excitation light irradiating device 70 which is a light source of blue wavelength band light (light L1) and also an excitation light source, a green light source device 80 which is a light source of green wavelength band light, and a red light source device 120 which is a light source of red wavelength band light. The green light source device 80 is composed of the excitation light irradiating device 70 and a fluorescent wheel device 100.

[0020] A light guide optical system 140 and a light source side optical system 170 that guide light of each color wavelength band are arranged in the light source device 60. The light guide optical system 140 guides the light emitted from the excitation light irradiating device 70, the green light source device 80, and the red light source device 120 to the light source side optical system 170.

[0021] 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 includes a light source group consisting of a plurality of blue laser diodes 71. The blue laser diode 71 is a semiconductor light emitting element, and is disposed so that the optical axis of the emitted light is parallel to that of the red light emitting diode 121.

[0022] 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 2 rows and 5 columns (details are 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.

[0023] 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 emitting 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 emitting device 70. The motor 110 drives and rotates the fluorescent wheel 101. The condensing lens group 111 condenses a light beam of the excitation light emitted from the excitation light emitting device 70 onto the fluorescent wheel 101, and condenses a 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. A cooling fan 261 is disposed between the motor 110 and the front panel 12, and the cooling fan 261 cools the fluorescent wheel device 100 and the like.

[0024] 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 an opening 112 side is connected to a shaft part of a motor 110 so as to be rotatable. In the fluorescent wheel 101, a C-ring-shaped fluorescent light-emitting region 310 and an arc-shaped transmission region 320 are 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 collected by the collection 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.

[0025] The substrate 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 substrate 102 facing the excitation light irradiator 70 is mirror-finished by silver deposition or the like. A green phosphor layer is laid on the mirror-finished surface 102a to form a fluorescent light-emitting region 310. The transmission region 320 is formed by fitting a transparent substrate having transparency into an arc-shaped cutout hole formed in the substrate 102. When the transmission region 320 is a region that diffuses and transmits excitation light, fine irregularities are formed on the surface of the transparent substrate by sandblasting or the like.

[0026] When the blue wavelength band light emitted from the excitation light irradiating device 70 is irradiated onto the fluorescent light-emitting 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-emitting 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. On the other hand, the blue wavelength band light that enters the transmission region 320 is transmitted or diffused and transmitted 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).

[0027] 2 focuses a light beam of blue wavelength band light emitted from the excitation light irradiating 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.

[0028] 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 condensing lens group 125 which condenses 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, a cooling fan 261, etc. provided on the right panel 14 side.

[0029] The light guide optical system 140 includes a first dichroic mirror 141, a second dichroic mirror 148, a reflecting mirror 145, and a plurality of condenser lenses 146, 147, and 149 that condense the light beams.

[0030] 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.

[0031] The optical member 4 collects 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 collects the blue wavelength band light from the exit surface (second lens surface 43) and emits it towards the collecting lens 146 (see also Figures 5 and 6). The collecting lens 146 is disposed on the left panel 15 side of the optical member 4. The reflecting mirror 145 is disposed on the left panel 15 side of the collecting lens 146. The reflecting mirror 145 converts the optical axis of the blue wavelength band light collected by the collecting lens 146 by 90 degrees towards the rear panel 13 side. The collecting lens 147 is disposed on the rear panel 13 side of the reflecting mirror 145.

[0032] Moreover, 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. Moreover, the optical axis of the green wavelength band light reflected by the first dichroic mirror 141 is incident on the condenser lens 149 substantially coinciding with the optical axis of the red wavelength band light.

[0033] 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 transmits through the second dichroic mirror 148 and is condensed via the condenser lens 173 to an entrance of a light guiding device 175 such as a light tunnel, a glass rod, or a microlens array.

[0034] 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 a part of the projection optical system 220.

[0035] The condenser lens 173 disposed near the light guiding device 175 condenses the light source light to 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 condensed by the condenser lens 173 and enter the light guiding device 175. The light beam entering the light guiding device 175 becomes a light beam with a uniform intensity distribution by the light guiding device 175.

[0036] A condenser lens 178 and an optical axis conversion mirror 181 are disposed on the optical axis of the light guiding device 175 on the rear panel 13 side. The optical axis of the light beam emitted from the exit of the light guiding 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.

[0037] The light beam reflected by the optical axis conversion mirror 181 is collected by the collecting lens 183, and then is irradiated at a predetermined angle by the irradiation mirror 185 via the condenser lens 195 onto the display element 27. The display element 27 of this embodiment is a DMD (Digital Micromirror Device) equipped with a plurality of 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.

[0038] 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 a 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.

[0039] 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, the 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 data, so that a color image can be projected on the screen.

[0040] Fig. 4 is a diagram showing a holding member 5 that holds the optical member 4. The holding member 5 holds the condenser lens group 111 and the condenser lens 146 shown in Fig. 2, and also holds the optical member 4. Furthermore, a fluorescent wheel 101 is disposed in a storage section 57, which is a space provided between the condenser lens group 111 and the optical member 4. The condenser lens group 111 and the condenser lens 146 are not shown in Fig. 4.

[0041] 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 the light toward the condenser lens 146. The optical member 4 is a so-called irregular lens having a spherical first lens surface 42 that is a convex lens surface and a cylindrical second lens surface 43 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.

[0042] As shown in Figs. 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 perpendicular 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 an effective area A1 in which an 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. The first lens surface 42 is formed as a convex lens surface protruding in a spherical shape from the first abutment portion 41. Therefore, light L1 irradiated to first lens surface 42 enters optical member 4 with its X-axis and Z-axis components condensed.

[0043] Second abutment portion 421 is a boundary between first abutment portion 41 and first lens surface 42, and is formed on the arc-shaped outer periphery of first lens surface 42. Second abutment portion 421 abuts against second abutment portion 533 of holding member 5, which will be described later, and is used for positioning optical member 4.

[0044] Further, the optical member 4 has a curved second lens surface 43 on the side of a reference surface S2 parallel to the YZ plane (in other words, on the side of a surface that intersects the reference surface S1 perpendicularly in a different direction). 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 condensed. As shown in FIG. 6(a), an effective area A2 is formed on the inside of 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 indicated by hatching).

[0045] 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.

[0046] As shown in FIG. 6(b), the optical member 4 has a reflecting surface 45 inclined with respect to the reference surface S1, the reference surface S2, and the reference surface S3 on the rear side opposite to the first lens surface 42. 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 coat 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 the light to the second lens surface 43 side. The light L1 reflected by the reflecting surface 45 has a component in the Y-axis direction condensed. Furthermore, flat surfaces 46 and 47 parallel to the XY plane are formed on the upper and lower surfaces of the optical member 4 in the Z-axis direction.

[0047] The holding member 5 shown in FIG. 7 has a lens holding section 51 that holds the condenser lens group 111 shown in FIG. 2, and a lens holding section 52 that holds the optical member 4 and the condenser lens 146. The lens holding section 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 holding section 51 also has an opening 511 that transmits the light L1 emitted from the condenser lens group 111 to the lens holding section 52 side. Fixing sections 55 and 56 that can fix the holding member 5 to an internal case (not shown) of the light source device 60 are formed on the upper parts of the lens holding section 51 and the lens holding section 52. In addition, a storage section 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 holding section 51 and the lens holding section 52.

[0048] The lens holding portion 52 includes a positioning portion 53 formed in a plate shape substantially parallel to the ZX plane, and an emission-side support plate portion 54 connected to the positioning portion 53 and formed in a plate shape substantially parallel to the YZ plane. The positioning portion 53 is formed shorter in the top and bottom than the support plate portion 54. An upper plate 521 and a lower plate 522 are provided on the top and bottom of the positioning portion 53, respectively, and are connected to the inner surface 541 side of the support plate portion 54. The upper plate 521 and the lower plate 522 are formed parallel to the XY plane. Therefore, the lens holding portion 52 is formed with a box-shaped portion that is open on the X-axis positive direction side and the Y-axis positive direction side.

[0049] The positioning section 53 has a first contact section 531 which is a flat surface parallel to the ZX plane. An opening optical path section 532 (opening) which is a cutout section cut into a U-shape is formed in a part of the positioning section 53. The opening optical path section 532 is opened to a size large enough to transmit the light L1 emitted from the condenser lens group 111 side. The inner edge of the opening optical path section 532 is formed so as to be approximately parallel to the arc-shaped outer periphery (second abutted section 421) of the first lens surface 42 in a state in which the optical member 4 is accommodated in the positioning section 53 (see FIG. 9). Note that the opening optical path section 532 is not limited to a configuration in which a part of the positioning section 53 is cut out, and may be formed as a through hole penetrating in a shape such as a circle.

[0050] The opening optical path section 532 has a rib-shaped second abutment section 533 that protrudes inward from the inner surface 532a. A plurality of second abutment sections 533 (two in this embodiment) are provided, and stand substantially perpendicularly inward from the inner surface 532a at the same height. The second abutment section 533 has an abutment surface 533a at its tip that is curved to have the same diameter as the second abutted section 421 and can abut against the second abutted section 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 section 531. The abutment surface 533a of the second abutment section 533 can abut against the second abutted section 421 at a corner 533b on the optical member 4 side. When the second abutment section 533 is provided in a flat surface shape, the second abutment section 533 and the second abutted section 421 abut substantially at a point. The second contact portions 533 are each formed so that the length in the Y-axis direction is approximately the same as the length of the inner surface 532a.

[0051] Returning to Fig. 7, the support plate portion 54 has 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 has 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. The opening optical path portion 543 is not limited to a through hole shape and may be provided as a notch.

[0052] 2 on the surface opposite to the inner surface 541. The end of the support plate 54 (the end on the Y-axis positive side) is formed flat and substantially parallel to the ZX plane, and has positioning protrusions 591 and female screw portions 592 on the top and bottom, respectively. The positioning protrusions 591 are provided inside the upper and lower female screw portions 592.

[0053] 4, a fixing member 6 that presses and fixes the optical member 4 positioned by the positioning portion 53 and the support plate portion 54 is attached to the holding member 5. 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 towards the first abutment portion 531 and the second abutment portion 533. The fixing member 6 is formed from a metal plate.

[0054] The mounting portion 61 is formed in an elongated rectangular plate shape and has positioning holes 611, 612. One positioning hole 611 is a round hole, and the other positioning hole 612 is formed in an elongated hole shape. A cylindrical positioning protrusion 591 formed on the support plate portion 54 is inserted into each of the positioning holes 611, 612 to determine the mounting position of the fixing member 6. Also, 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.

[0055] The pressing portion 62 is formed in a rectangular plate shape 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 a cantilever leaf spring shape connected with the mounting portion 61 side as a fulcrum. In addition, 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, the tip of the pressing portion 62 has a convex contact portion 621 formed on the optical member 4 side shown in FIG. 4.

[0056] Next, a method for positioning the optical member 4 will be described with reference mainly 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 as to be 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.

[0057] 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 (position in the Z axis direction), (2) left / right position (position in the X axis direction), (3) front / rear position (position in the Y axis direction), (4) front angle position (position of angle θy around the Y axis), (5) tilt angle (position of angle θx around the X axis), and (6) horizontal angle (position of angle θz around the Z axis).

[0058] As shown in FIG. 8, the optical member 4 is positioned by first abutting the first abutted portion 41 of the optical member 4 against the first abutting portion 531. The first abutted portion 41 and the first abutted portion 531 are each formed flat, and therefore abut against each other. Therefore, the Y-axis direction position (first axis direction position) of the first abutted portion 41 is positioned parallel to the ZX plane. As a result, the Y-axis direction position (the above-mentioned (3) front-rear direction position) of the optical member 4 is positioned, and the angle θx position around the X-axis and the angle θz position around the Z-axis (the above-mentioned (5) tilt angle and (6) horizontal angle) are positioned. The first lens surface 42, which is a convex lens, is disposed within the opening optical path portion 532.

[0059] Next, as shown in FIG. 9, the second contacted portion 421 is brought into contact with the contact surface 533a of the rib-shaped second contact portion 533. In this embodiment, since the contact surface 533a is formed in a curved shape perpendicular to the first contact portion 531, the second contacted portion 421 and the corner portion 533b of the second contact portion 533 are in approximate linear contact along the outer periphery of the first lens surface 42. Therefore, the X-axis position (second axial position) and the Z-axis position (third axial position) (the above-mentioned (2) left-right position and (1) height position) of the optical member 4 are positioned. The optical member 4 is positioned by the first contact portion 531 and the second contact 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.

[0060] 10, the third contact portion 44 of the optical member 4 is pressed by an appropriate jig (not shown) to bias the optical member 4 in the adjustment direction D1 (negative direction of the X-axis) indicated by the dashed line. At this time, the third contact portion 44 is adjusted so as to be parallel to the YZ plane, and the angle θy position (the above-mentioned (4) front angle) around the Y-axis 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 condenser lens 146 (see FIG. 2).

[0061] As shown in FIG. 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 contact portion 531 and the second contact 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 above-mentioned six degrees of freedom. The position of the contact portion 621 that contacts the optical member 4 is closer to the second contacted portion 421 (X-axis positive direction side) than the second contact 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. Since the optical member 4 is stably supported in this way, even if vibration is applied to the light source device 60 or the projection device 10 equipped with the light source device 60, the position and posture of the optical member 4 can be maintained and light can be stably guided. In addition, optical member 4 includes first lens surface 42, second lens surface 43, and reflecting surface 45 that collects light, and reflecting surface 45 that changes the direction of the optical axis, and thus has multiple functions in one member. Therefore, the number of parts can be reduced, and light source device 60 and projection device 10 can be made smaller.

[0062] Before the first contact portion 41 and the first contact portion 531 are brought into contact with each other, an adhesive G (see FIG. 11) can be applied in advance to one or both of the first contact portion 41 and the first contact portion 531. 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 above-mentioned adjustment direction D1 by the jig, thereby fixing the position of the optical member 4. The adhesive G can be used as a temporary fix that suppresses rotation at 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.

[0063] Furthermore, 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. Furthermore, 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.

[0064] Furthermore, in the present 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. However, the holding member 5 and the 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).

[0065] Furthermore, in the description of this embodiment, the first contact portion 531 has been described as having a flat surface, but, for example, a configuration in which a recess or a plurality of protrusions are provided in a part 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 member 4 is configured with a plurality of (for example, three or more) protrusions arranged in a flat shape, so that the first contact portion 531 of the optical member 4 can be easily positioned in the Y-axis direction while being parallel to the ZX plane.

[0066] As described above, the optical member 4 described in the embodiment of the present invention has the first contact portion 41 on the first reference plane (S1) side, the convex lens surface (42) protruding from the first contact portion 41, and the second contact portion 421 provided on the outer circumferential edge of the convex lens surface (42). The holding member 5 also has a positioning portion 53 including a first contact portion 531 that positions the first axial position of the first contact portion 41, and a second contact portion 533 that abuts against the second contact portion 421 inside the opening portion (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 contact portion 421. When the optical member 4 is attached, the third contact portion 44 can be easily adjusted to be parallel to the YZ plane by pressing it.

[0067] 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 (position in the Z axis direction), (2) left / right direction position (position in the X axis direction), (3) front / rear direction position (position in the Y axis direction), (4) front angle position (position of angle θy around the Y axis), (5) tilt angle (position of angle θx around the X axis), and (6) horizontal angle (position of angle θz around the Z axis). Therefore, the holding member 5 can position the optical member 4 with high precision.

[0068] Further, second contacting portion 533 is provided in the form of a plurality of ribs, and has a curved tip portion curved along second contacted portion 421. Since the dimensional accuracy of rib-shaped second contacting portion 533 can be relatively easily improved compared to the case where a curved contacting portion is used, optical member 4 can be easily positioned even when positioning optical member 4 by contacting it with curved second contacting portion 421 such as the outer peripheral edge of convex lens surface (42).

[0069] Moreover, the first reference plane (S1) and the second reference plane (S3) intersecting therewith are provided perpendicular to each other, and the first contact portion 531 is a flat surface perpendicular to the first axial direction. Moreover, the tip portion is provided perpendicular to the first contact portion 531. This allows the first contacted portion 41 to be easily positioned, and allows the optical member 4 to be easily held even if the optical member 4 has a functional portion on a surface other than the first reference plane (S1) and the second reference plane (S3).

[0070] In addition, the optical element 4 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 holding member 5, in which the third abutment portion 44 is provided in a flat surface form, can easily adjust the angle θy position of the optical element 4 around the Y axis.

[0071] Moreover, the optical member 4 has a cylindrical surface on the opposite side to the third abutment 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 enables the optical member 4 to collect the incident light while converting the optical axis in a direction different from the incident direction and outputting the light.

[0072] 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 plane (S1), can prevent the light guided by the optical member 4 from being blocked by holding the optical member 4.

[0073] In addition, the holding member 5 has a fixing member 6 that fixes the optical element 4, and the fixing member 6 urges the optical element 4 toward the first abutment portion 531 and the second abutment portion 533 to fix the optical element 4. Since the holding member 5 fixes the optical element 4 while abutting it against a portion that serves as a reference for positioning, the holding state can be easily maintained with the optical element 4 positioned.

[0074] Furthermore, the light source device 60 and the projection device 10, which include a light source (excitation light irradiation device 70 in this embodiment), an optical member 4 to 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 vibration or the like is applied to the housing, because the holding member 5 can stably position the optical member 4 with high precision. Furthermore, by configuring the optical member 4 to have multiple optical functions, the number of optical members can be reduced, and the light source device 60 and the projection device 10 can be made smaller overall.

[0075] In addition, the above-mentioned holding method of the optical member 4 by the holding member 5 is configured such that the first abutting portion 531 positions the first axial position of the first abutted portion 41, and the second abutting portion 533 abuts against the second abutted portion 421 to position the second axial position and the third axial position intersecting the first axial position of the second abutted portion 421. As a result, the optical member 4 is stably fixed with respect to the holding member 5 with respect to six degrees of freedom, namely, (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 accuracy.

[0076] 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 in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims.

[0077] 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 retaining member described in [1], wherein the second abutment portion is provided in the form of multiple ribs and has a curved tip portion that curves along the second abutted portion. [3] 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 abutment portion. The retaining member according to [2] above, [4] The optical member has a third abutment portion provided on a second reference plane side intersecting with the first reference plane, The holding member according to any one of [1] to [3], wherein the third abutment 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 the 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 to 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 each other along the first axial direction, A light source device characterized by: [9] The light source device according to [8] above, 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 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: [Explanation of symbols]

[0078] 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 unit 24 Display encoder 25 Video RAM 26 Display driver 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 unit 35 IR receiving unit 36 Ir processing section 37 Key / indicator section 38 Control unit 39 Speaker 41: First contact portion; 42: First lens surface 43 Second lens surface 44 Third abutted part 45 Reflective surface 46 Flat surface 47 Flat surface 51 Lens holder 52 Lens holding portion 53 Positioning portion 54 Support plate part 55 Fixed part 56 Fixing part 57 Storage part 58 Lens holder 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 Substrate 102a Surface 110 Motor 111 condenser lens group 112 aperture 120 Red light source device 121 Red light emitting diode 125 condenser lens group 130 heat sink 140 Light guide 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 guide 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 region 320 Transmitting region 421 Second abutted part 511 Opening part 521 Upper plate 522 Lower plate 531 First contact part 532 Aperture optical path part 532a Inner surface 533 Second contact part 533a Contact surface 533b Corner 541 Inner surface 543 Aperture optical path section 591 Positioning projection 592 Female screw part 611 Positioning hole 612 Positioning hole 613 Screw hole 621 Contact part A1 Effective area A2 Effective area D1 Adjustment direction G Adhesive L1 light S irradiation area S1 Reference plane (first reference plane) S2 Reference plane S3 Reference Plane (Second Reference Plane) SB System Bus X1 center axis Y1 center axis θx angle θy angle θz angle

Claims

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; 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.

2. 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 abutment portion. The holding member according to claim 1 .

3. 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.

4. 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. 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.

6. 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.

7. 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 abutted portion, and a second abutment portion that abuts against the second abutted portion inside an opening that houses the convex lens surface 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, 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:

8. 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:

9. 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:

Images