JP2016041959A - Fastening structure, projection device with the fastening structure, and fastening method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening structure hardly being disassembled.SOLUTION: A through hole 470 as a first through hole having a large diameter part 471, a step part 472 and a small diameter part 473 is provided in a lens holding member 410 as a first member. A fixing member 450 as a second member is joined to the lens holding member 410 from the small diameter part 473 side. A through hole 480 as a second through hole is provided in the fixing member 450. A screw member 460 includes a head part 461, and a shaft part 465 extending from the head part 461. The shaft part 465 includes a male screw part 466 which can be screwed to a female screw part 481 formed in the through hole 480, and a small diameter shaft part 468 which is not threaded. A top face 462 of the head part 461 is positioned in the large diameter part 471 in a screw start position of the male screw part 466 and the female screw part 481.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a fastening structure for fastening members together, a projection apparatus including the fastening structure, and a fastening method for fastening members together.

  Conventionally, a fastening structure in which a member to be held is sandwiched by a plurality of members and the member to be held is difficult to take out has been disclosed. For example, a projection apparatus including a laser diode as a light source has a fastening structure that makes it difficult to take out the laser diode so that the laser diode is intentionally taken out and diverted to other uses.

  In the projection apparatus disclosed in Patent Document 1, the fastening screw is loosened by pressing the side surface of the fastening screw that fastens the members sandwiching the laser diodes with another screw to cause plastic deformation. A difficult fastening structure is disclosed. Further, in the projection apparatus disclosed in Patent Document 2, a locking member having a head is inserted into a hole passing through the members that sandwich the laser diode, and this head is used as a sealing agent such as an adhesive. The fastening structure which is made to immerse by and fastens members is disclosed.

JP 2012-243508 A JP 2012-208207 A

  However, even with such a structure, there remains a risk of being disassembled by an available tool or the like, and a held member such as a laser diode that is desired to be taken out may be taken out.

  Therefore, the objective of this invention provides the fastening structure made difficult to disassemble | disassemble from another viewpoint, a projection apparatus provided with this fastening structure, and a fastening method.

  The fastening structure of the present invention includes a first portion having a large diameter portion, a step portion connected to the large diameter portion, and a first through hole formed by the small diameter portion connected to the step portion. A member, a second member that communicates with the first through hole, has a second through hole in which an internal thread portion is formed, and is joined to the first member from the small diameter portion side; and a head And a shaft member extending from the head portion, the shaft portion having a small diameter shaft portion and a male screw portion connected to the opposite side of the head portion of the small diameter shaft portion; The diameter of the small-diameter shaft portion is smaller than the diameter of the valley of the male screw portion, and the top surface of the head in a state where the male screw portion is inserted through the second through hole is inside the large-diameter portion. It is characterized by being located.

  The projection device of the present invention includes a light source device having the above-described fastening structure, a display element that is irradiated with light source light from the light source device to form image light, and the image light emitted from the display element on a screen. A projection-side optical system for projecting.

  The fastening method according to the present invention includes a first portion having a large diameter portion, a step portion connected to the large diameter portion, and a first through hole formed by the small diameter portion connected to the step portion. A member joining step for joining a member and a second member having a second through hole that is communicated with the small-diameter portion and in which a female screw portion is formed; a head; and a shaft that extends from the head. The shaft portion includes a small-diameter shaft portion and a male screw portion connected to the opposite side of the head portion of the small-diameter shaft portion to the male screw portion and the female screw portion. And a screwing releasing step of bringing the male screw part and the female screw part into a non-screwing state.

  According to the present invention, it is possible to provide a fastening structure that makes it difficult to disassemble, a projection device including the fastening structure, and a fastening method.

It is an external appearance perspective view which shows the projector which concerns on embodiment of this invention. It is a figure which shows the functional block of the projection apparatus which concerns on embodiment of this invention. It is a plane schematic diagram which shows the internal structure of the projection apparatus which concerns on embodiment of this invention. It is a perspective view of the excitation light irradiation apparatus which concerns on embodiment of this invention. It is the front view which abbreviate | omitted the lens holding | suppressing of the excitation light irradiation apparatus which concerns on embodiment of this invention. It is VI-VI sectional drawing of FIG. 5 which shows the excitation light irradiation apparatus which concerns on embodiment of this invention, (a) shows the state in which the screw member is being fixed, (b) is not fixing the screw member. Indicates the state. It is sectional drawing equivalent to the VI-VI cross section of FIG. 5 which shows the excitation light irradiation apparatus which concerns on embodiment of this invention, (a)-(d) is a figure which shows each process in a fastening method. It is a flowchart of the fastening method which concerns on embodiment of this invention. It is sectional drawing equivalent to the VI-VI cross section of FIG. 5 which shows the excitation light irradiation apparatus which concerns on another embodiment of this invention. It is the front view which abbreviate | omitted the lens holding | suppressing of the excitation light irradiation apparatus which concerns on another embodiment of this invention. It is XI-XI sectional drawing of FIG. 10 which shows the excitation light irradiation apparatus which concerns on another embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of the projection apparatus 10. In the present embodiment, left and right in the projection device 10 indicate the left and right direction with respect to the projection direction, and front and rear indicate the screen side direction of the projection device 10 and the front and rear direction with respect to the traveling direction of the light flux.

  As shown in FIG. 1, the projection device 10 has a substantially rectangular parallelepiped shape, and has a lens cover 19 that covers the projection port on the side of the front panel 12 that is a side plate in front of the housing of the projection device 10. At the same time, the front panel 12 is provided with a plurality of exhaust holes 17. Further, although not shown, an Ir receiver for receiving a control signal from the remote controller is provided.

  Further, a key / indicator unit 37 is provided on the top panel 11 of the casing, and the key / indicator unit 37 switches a power switch key, a power indicator for notifying power on / off, and switching on / off of projection. Keys and indicators such as an overheat indicator for notifying when a projection switch key, a light source device, a display element, a control circuit or the like is overheated are arranged.

  In addition, an input / output connector portion provided with a D-SUB terminal, an S terminal, an RCA terminal, an audio output terminal, and the like for inputting a video signal to which a USB terminal or an analog RGB video signal is input to the rear panel is provided on the rear surface of the housing; Various terminals (group) 20 such as a power adapter plug are provided. In addition, a plurality of intake holes are formed in the back panel. A plurality of exhaust holes 17 are formed in the right side panel, which is a side plate of the casing (not shown), and the left side panel 15 and the front panel 12, which are side plates shown in FIG. An intake hole 18 is also formed in the corner of the left panel 15 near the rear panel and the rear panel.

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

  The control unit 38 controls the operation of each circuit in the projection apparatus 10, and includes a CPU, a ROM that stores operation programs such as various settings fixedly, and a RAM that is used as a work memory. ing.

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

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

  The display driving unit 26 functions as a display element control unit, and drives the display element 51 that is a spatial light modulation element (SOM) at an appropriate frame rate in accordance with the image signal output from the display encoder 24. Is.

  The projection apparatus 10 irradiates the display element 51 with the light beam emitted from the light source apparatus 60 via the light source side optical system, thereby forming an optical image with the reflected light of the display element 51, and An image is projected and displayed on a screen via an optical system. The movable lens group 235 of the projection side optical system is driven by the lens motor 45 for zoom adjustment and focus adjustment.

  The image compression / decompression unit 31 performs a recording process in which the luminance signal and the color difference signal of the image signal are data-compressed by a process such as ADCT and Huffman encoding, and sequentially written in a memory card 32 that is a detachable recording medium. .

  Further, the image compression / decompression unit 31 reads the image data recorded on the memory card 32 in the reproduction mode, decompresses each image data constituting a series of moving images in units of one frame, and converts the image data into an image conversion Based on the image data that is output to the display encoder 24 via the unit 23 and stored in the memory card 32, a process for enabling display of a moving image or the like is performed.

  Then, an operation signal of a key / indicator unit 37 composed of a main key and an indicator provided on the top panel 11 of the housing is directly sent to the control unit 38, and a key operation signal from the remote controller is received by Ir. The code signal received by the unit 35 and demodulated by the Ir processing unit 36 is output to the control unit 38.

  Note that an audio processing unit 47 is connected to the control unit 38 via a system bus (SB). The sound processing unit 47 includes a sound source circuit such as a PCM sound source, converts the sound data into analog in the projection mode and the playback mode, and drives the speaker 48 to emit loud sounds.

  Further, the control unit 38 controls a light source control circuit 41 as a light source control unit, and the light source control circuit 41 is configured so that light of a predetermined wavelength band required at the time of image generation is emitted from the light source device 60. Individual control is performed to emit red, green, and blue wavelength band light from the excitation light source and the red light source device at a predetermined timing.

  Further, the control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection using a plurality of temperature sensors provided in the light source device 60 and the like, and controls the rotation speed of the cooling fan based on the temperature detection result. Further, the control unit 38 causes the cooling fan drive control circuit 43 to maintain the rotation of the cooling fan even after the projection apparatus 10 body is turned off by a timer or the like, or depending on the result of temperature detection by the temperature sensor, Control such as turning off the power is also performed.

  Next, the internal structure of the projection apparatus 10 will be described with reference to FIG. FIG. 3 is a schematic plan view showing the internal structure of the projection apparatus 10. The projection apparatus 10 includes a control circuit board 241 in the vicinity of the right panel 14. The control circuit board 241 includes a power circuit block, a light source control block, and the like. In addition, the projection device 10 includes a light source device 60 at the side of the control circuit board 241, that is, at a substantially central portion of the housing of the projection device 10. Further, in the projector 10, a light source side optical system 170 and a projection side optical system 220 are disposed between the light source device 60 and the left panel 15.

  The light source device 60 is a red light source device 120 that is a light source of red wavelength band light, a light source of blue wavelength band light, an excitation light irradiation device 70 that is also used as an excitation light source, and a light source of green wavelength band light. A green light source device 80. The green light source device 80 includes an excitation light irradiation device 70 and a fluorescent wheel device 100. The light source device 60 is provided with a light guiding optical system 140 that guides and emits light of each wavelength band of red, green, and blue. The light guide optical system 140 condenses each color wavelength band light emitted from each color light source device at the entrance of the light tunnel 175.

  An excitation light irradiation device 70 that is an excitation light source constituting the green light source device 80 is disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the housing of the projection device 10. The excitation light irradiation device 70 includes a light source group including a blue laser diode 71 that is a plurality of semiconductor light emitting elements arranged so that the optical axis is parallel to the back panel 13, and light emitted from each blue laser diode 71. Reflective mirror group 75 that converts the axis 90 degrees in the direction of the front panel 12, a condensing lens 78 that collects the emitted light from each blue laser diode 71 reflected by the reflective mirror group 75, and the blue laser diode 71 and the right panel 14 and the like. (Details of the heat sink 81 are shown in FIG. 4 to be described later, but in FIG. 3, a current plate is provided above the heat sink 81 in FIG. 4.)

  The light source group includes a total of 24 blue laser diodes 71 arranged in a matrix in 3 rows and 8 columns. On the optical axis of each blue laser diode 71, a collimator lens 73 that converts the light emitted from each blue laser diode 71 into parallel light is arranged so as to enhance the directivity of each emitted light. In addition, the reflecting mirror group 75 is formed by aligning a plurality of reflecting mirrors in a stepped manner and integrated with the mirror substrate 76 to adjust the position, and uniformizes the cross-sectional area of the light beam emitted from the blue laser diode 71. The image is reduced in the direction and emitted to the condenser lens 78.

  A cooling fan 261 is disposed between the heat sink 81 and the back panel 13, and the blue laser diode 71 is cooled by the cooling fan 261 and the heat sink 81. Further, a cooling fan 261 is disposed between the reflection mirror group 75 and the back panel 13, and the reflection mirror group 75 and the condenser lens 78 are cooled by the cooling fan 261.

  The red light source device 120 includes a red light source 121 disposed so that the optical axis is parallel to the blue laser diode 71, and a condensing lens group 125 that condenses light emitted from the red light source 121. The red light source 121 is a red light emitting diode that is a semiconductor light emitting element that emits light in a red wavelength band. In the red light source device 120, the optical wavelength of the red wavelength band light emitted from the red light source device 120 is the light of the blue wavelength band light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the fluorescent wheel 101. It is arranged to intersect the axis. Furthermore, the red light source device 120 includes a heat sink 130 disposed on the right panel 14 side of the red light source 121. A cooling fan 261 is disposed between the heat sink 130 and the front panel 12, and the red light source 121 is cooled by the cooling fan 261 and the heat sink 130.

  The fluorescent wheel device 100 is arranged to be parallel to the front panel 12, that is, the fluorescent wheel 101 arranged so as to be orthogonal to the optical axis of the emitted light from the excitation light irradiation device 70, and the fluorescent wheel 101 is rotationally driven. And a condensing lens that condenses the light bundle of the excitation light emitted from the excitation light irradiation device 70 on the fluorescent wheel 101 and condenses the light bundle emitted from the fluorescent wheel 101 toward the rear panel 13. A group 107 and a condenser lens 115 that condenses the light bundle emitted from the fluorescent wheel 101 toward the front panel 12. A cooling fan 261 is disposed between the wheel motor 110 and the front panel 12, and the fluorescent wheel device 100 and the like are cooled by the cooling fan 261.

  The fluorescent wheel 101 is a disk-shaped metal substrate, and has a fluorescent light emitting region where fluorescent light is emitted and a diffuse transmission region that diffuses incident light. The fluorescent light emitting region of the fluorescent wheel 101 is formed as an annular recess. On the surface of the fluorescent wheel 101 on the side of the excitation light irradiation device 70, a reflective surface that reflects light is formed by being mirror processed by silver vapor deposition or the like. The phosphor layer laid on the reflecting surface is formed of a green phosphor. Therefore, when the phosphor layer is irradiated with blue wavelength band light as excitation light from the excitation light irradiation device 70, the green phosphor is excited and green wavelength band light is emitted from this green phosphor in all directions. The

  The fluorescently emitted light bundle is reflected directly or by the reflecting surface, is emitted to the front side of the fluorescent wheel 101 (in other words, the rear panel 13 side), and enters the condenser lens group 107. The excitation light irradiated on the metal substrate without being absorbed by the phosphor of the phosphor layer is reflected by the reflecting surface and is incident on the phosphor layer again to excite the phosphor. Therefore, by using the surface of the concave portion of the fluorescent wheel 101 as a reflection surface, the utilization efficiency of the excitation light emitted from the excitation light irradiation device 70 can be increased, and the light can be emitted more brightly.

  On the other hand, the blue wavelength band light from the excitation light irradiating device 70 incident on the diffuse transmission region in the fluorescent wheel 101 is diffused and transmitted through the fluorescent wheel 101, and the back side of the fluorescent wheel 101 (in other words, the front panel 12 side). Is incident on a condenser lens 115 disposed in

  The light guide optical system 140 includes a condensing lens that condenses the light bundles of the red, green, and blue wavelength bands, and a reflection mirror that converts the optical axes of the light bundles of the respective color wavelength bands into the same optical axis, It consists of a dichroic mirror. Specifically, the light guide optical system 140 includes blue wavelength band light emitted from the excitation light irradiation device 70, green wavelength band light emitted from the fluorescent wheel 101, and red wavelength emitted from the red light source device 120. A first dichroic mirror that transmits blue and red wavelength band light, reflects green wavelength band light, and converts the optical axis of the green wavelength band light by 90 degrees toward the left panel 15 at a position where the band light intersects. 141 is arranged.

  Further, the blue wavelength band light is reflected on the optical axis of the blue wavelength band light diffusely transmitted through the fluorescent wheel 101, that is, between the condenser lens 115 and the front panel 12, and the optical axis of the blue light is changed. A first reflecting mirror 143 that converts 90 degrees in the direction of the left panel 15 is disposed. A condensing lens 146 is disposed on the left panel 15 side of the first reflecting mirror 143, and a second reflecting mirror 145 is disposed on the left panel 15 side of the condensing lens 146. A condensing lens 147 is disposed on the rear panel 13 side of the second reflecting mirror 145. The second reflection mirror 145 converts the optical axis of the blue wavelength band light reflected by the first reflection mirror 143 and incident via the condenser lens 146 to the rear panel 13 side by 90 degrees.

  A condensing lens 149 is disposed on the left panel 15 side of the first dichroic mirror 141. Further, a 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 the red wavelength band light and the green wavelength band light, converts the 90 ° optical axis to the back panel 13 side, and transmits the blue wavelength band light.

  The optical axis of the red wavelength band light transmitted through the first dichroic mirror 141 is coincident with the optical axis of the green wavelength band light reflected by the first dichroic mirror 141. Accordingly, both the red wavelength band light transmitted through the first dichroic mirror 141 and the green wavelength band light reflected by the first dichroic mirror 141 are incident on the condenser lens 149. Then, the red and green wavelength band light transmitted through the condensing lens 149 is reflected by the second dichroic mirror 148 and is condensed at the entrance of the light tunnel 175 via the condensing lens 173 of the light source side optical system 170. . On the other hand, the blue wavelength band light that has passed through the condenser lens 147 passes through the second dichroic mirror 148 and is condensed at the entrance of the light tunnel 175 via the condenser lens 173.

  The light source side optical system 170 includes a condenser lens 173, a light tunnel 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 the image light emitted from the display element 51 disposed on the back panel 13 side of the condenser lens 195 toward the projection side optical system 220. Therefore, the condenser lens 195 also includes a part of the projection side optical system 220. Has been.

  In the vicinity of the light tunnel 175, a condenser lens 173 that condenses the light source light at the entrance of the light tunnel 175 is disposed. Therefore, the red wavelength band light, the green wavelength band light, and the blue wavelength band light are collected by the condenser lens 173 and enter the light tunnel 175. The light beam incident on the light tunnel 175 is converted into a light beam having a uniform intensity distribution by the light tunnel 175.

  On the optical axis on the back panel 13 side of the light tunnel 175, an optical axis conversion mirror 181 is disposed via a condenser lens 178. The beam bundle emitted from the exit of the light tunnel 175 is condensed by the condenser lens 178 and then the optical axis is converted to the left panel 15 side by the optical axis conversion mirror 181.

  The light beam reflected by the optical axis conversion mirror 181 is condensed by the condenser lens 183 and then irradiated by the irradiation mirror 185 to the display element 51 through the condenser lens 195 at a predetermined angle. The display element 51 that is a DMD is provided with a heat sink 190 on the back panel 13 side, and the display element 51 is cooled by the heat sink 190.

  The light beam that is the light source light irradiated to the image forming surface of the display element 51 by the light source side optical system 170 is reflected by the image forming surface of the display element 51 and projected onto the screen through the projection side optical system 220 as projection light. Is done. Here, the projection side optical system 220 includes a condenser lens 195, a movable lens group 235, and a fixed lens group 225. The fixed lens group 225 is built in the fixed lens barrel. The movable lens group 235 is built in the movable lens barrel and can be moved by a lens motor, thereby enabling zoom adjustment and focus adjustment.

  By configuring the projection device 10 in this way, when the fluorescent wheel 101 is rotated and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at different timings, light in each wavelength band of red, green, and blue is guided. Since the light enters the condenser lens 173 and the light tunnel 175 sequentially via the optical optical system 140 and further enters the display element 51 via the light source side optical system 170, the DMD that is the display element 51 of the projection apparatus 10 receives data. Accordingly, the color image can be projected onto the screen by displaying each color light in a time-sharing manner.

  Next, the excitation light irradiation device 70 will be described with reference to FIG. FIG. 4 is a perspective view of the excitation light irradiation device 70. The excitation light irradiation device 70 is provided with a blue laser diode 71. Here, the emission direction of the blue laser diode 71 (right side direction in FIG. 3) will be described as the upper side, and the opposite direction (left side direction in FIG. 3) will be described as the lower side. In the excitation light irradiation device 70, a collimator lens 73 is placed on a lens holding member 410 that is a first member. The collimator lens 73 is pressed by the lens presser 420 from the upper surface side of the lens holding member 410. The lens retainer 420 is fixed by inserting bolts into six holes 424 near the outer peripheral edge and screwing the bolts into corresponding screw holes 411 provided in the lens holding member 410.

  On the other hand, a fixing member 450 serving as a second member on which the blue laser diode 71 is placed is joined to the lens holding member 410 on the lower surface side of the lens holding member 410. A heat sink 81 is joined to the lower surface side of the fixing member 450.

  Next, a description will be given based on FIG. FIG. 5 is a top view seen from the collimator lens 73 side with the lens holder 420 omitted. At the middle portions of the four corners and the long side of the lens holding member 410, screw holes 411 for lens pressing for fixing the lens pressing 420 with bolts are provided. The collimator lenses 73 are arranged in a matrix of 3 rows and 8 columns and are placed in the lens placement holes 412 of the lens holding member 410.

  In addition, fixing bolts 413 serving as a first joining member for fixing the lens holding member 410 and the fixing member 450 are provided in the countersunk holes 414 provided between the lens mounting holes 412. Further, the fixing member 450 and the heat sink 81 are arranged in the same row as the countersink hole 414 in the top view of the lens holding member 410, and are fixed by a fixing bolt 421 that is a second joining member indicated by a broken line. And the screw member 460 for making it difficult to decompose | disassemble the excitation light irradiation apparatus 70 is provided in the through hole 470 used as the countersink-shaped 1st through hole arrange | positioned at two places with the screw hole 411. .

  FIG. 6 is a sectional view taken along line VI-VI in FIG. 6A shows a state in which the screw member 460 is fixed to the lens holding member 410, and FIG. 6B shows a state in which the screw member 460 is not fixed to the lens holding member 410. 6A, the collimator lens 73 is placed on the placement portion 415 formed in an annular shape in the lens placement hole 412 of the lens holding member 410 serving as the first member. The upper surface edge of the collimator lens 73 can be brought into contact with the lower surface side edge of the hole of the lens holder 420, and movement of the collimator lens 73 to the upper surface side is restricted.

  An LD mounting portion 451 on which the blue laser diode 71 is mounted is formed on the fixing member 450 as the second member in a countersink shape. The blue laser diode 71 placed on the LD placement portion 451 is sandwiched and held by the lens holding member 410 and the fixing member 450.

  In practice, it is preferable in terms of heat dissipation and the like that the lower surface of the lens holding member 410 presses the upper surface of the flange portion of the blue laser diode 71 and there is a slight gap between the lens holding member 410 and the fixing member 450. However, here, 410 and 450 are shown in contact with each other for easy understanding.

  The fixing member 450 is formed with a screw hole portion 422 having an upper surface formed in a countersink shape and through which a fixing bolt 421 serving as a second joining member passes. The fixing bolt 421 inserted through the screw hole 422 is screwed into a screw hole 423 formed on the upper surface side of the heat sink 81. Therefore, the lower surface of the fixing member 450 and the upper surface of the heat sink 81 are joined (fastened) by the fixing bolt 421, and both are fixed.

  A counterbore hole 414 provided in the lens holding member 410 is inserted with a head of a fixing bolt 413 that is a first bonding member penetrating the lens holding member 410. The fixing bolt 413 is screwed into a screw hole 452 provided in the fixing member 450. Therefore, the lower surface of the lens holding member 410 and the upper surface of the fixing member 450 are joined by the fixing bolt 413, and both are fixed. Further, by fixing the lens holding member 410 to the fixing member 450, the blue laser diode 71 is sandwiched and held by the lens holding member 410 and the fixing member 450.

  A large-diameter portion 471, a step portion 472, and a small-diameter portion 473 formed on the upper surface side are formed in the through-hole 470 that is a first through-hole provided in the lens holding member 410. In this way, the through hole 470 is formed in a countersink shape. The small diameter portion 473 is formed with a fixing female screw portion 474 that is a female screw.

  The fixing member 450 is formed with a through hole 480 serving as a second through hole. The through hole 480 is formed with a female screw portion 481 that is a female screw. The through hole 480 is aligned so as to communicate with the through hole 470 of the lens holding member 410. A recess 490 having a cylindrical surface is formed in the heat sink 81 as the third member. The recess 490 is aligned with the through hole 480 of the fixing member 450. That is, the through holes 470 and 480 and the recess 490 are formed concentrically and continuously.

  The screw member 460 is inserted through the through holes 470 and 480 and the recess 490 that communicate with each other. The screw member 460 includes a head portion 461, a shaft portion 465 extending from the head portion 461, and a male screw portion 466 continuously provided on the opposite side of the head portion 461 of the shaft portion 465, and the head portion 461 side of the shaft portion 465. Has a fixing male threaded portion 467. A small-diameter shaft portion 468 that is not screwed is formed between the fixing male screw portion 467 and the male screw portion 466 of the male screw portion 466. That is, here, the shaft portion 465 includes a fixing male screw portion 467, a small-diameter shaft portion 468, and a male screw portion 466.

The top surface 462 of the head 461 is formed with a fitting portion that can be fitted to the tip of a plus driver. The lower surface of the head 461 is in contact with the stepped portion 472 in the fixed state. The male screw portion 466 has a nominal diameter that can be screwed with the female screw portion 481 of the through hole 480. The male screw portion 466 is located in the recess 490.
The diameter of the small diameter shaft portion 468 is smaller than the diameter of the valley of the male screw portion 466 (the distance between the screw valley in the radial direction).
Here, for the sake of clarity, the small-diameter shaft portion 468 is described as an unthreaded cylindrical portion. However, even if the small-diameter shaft portion 468 has a crest diameter (a thread crest in the radial direction) There is no problem even if a screw whose distance between the peaks is smaller than the diameter of the valley of the male screw portion 466 is cut.

  As described above, the fixing male screw portion 467 that is a male screw is formed on the head 461 side (in other words, the base end portion of the shaft portion 465) with respect to the male screw portion 466 of the shaft portion 465. The fixing male screw portion 467 has a nominal diameter that can be screwed with the fixing female screw portion 474 of the through hole 470. The nominal diameters of the male screw portion 466 and the female screw portion 481 are smaller than the nominal diameters of the fixing male screw portion 467 and the fixing female screw portion 474. For example, the nominal diameter of the male screw portion 466 and the female screw portion 481 is M3, and the nominal diameter of the fixing male screw portion 467 and the fixing female screw portion 474 is M4. In addition, both nominal diameters can also be formed as the same nominal diameter.

  Here, as shown in FIG. 6B, when the screw member 460 is rotated by a driver to remove the screw member 460, the screwing between the fixing male screw portion 467 and the fixing female screw portion 474 is released. However, at this time, the male screw portion 466 formed at the tip portion of the shaft portion 465 is not screwed with the female screw portion 481, and is not screwed. Therefore, even if the screw member 460 is further rotated, the screw member 460 cannot be removed from the fixing member 450, and therefore the lens holding member 410 and the fixing member 450 cannot be completely separated. Further, since the male screw portion 466 is surrounded by the concave portion 490 on the lower side of the screw member 460, the screw member 460 is approached (for example, pushed) from the heat sink 81 side, and the male screw portion 466 and the female screw portion 481 are screwed together. The screw member 460 cannot be removed.

  Further, the screw member 460 can be lifted from the position shown in FIG. 6B, that is, the screw member 460 can be lifted upward, and the male screw portion 466 and the female screw portion 481 start to be screwed from the concave portion 490 side. Even if it can be in (state), the top surface 462 of the screw member 460 is formed so as to be located in the large diameter portion 471. As a result, the head 461 of the screw member 460 does not protrude from the upper surface of the lens holding member 410 even in this position (state). For example, the screw member is held by the screwdriver while holding the screw member 460 with a tool such as a spanner. It is possible to prevent the male screw portion 466 and the female screw portion 481 from being screwed by rotating the 460.

  Further, the diameter of the large diameter portion 471 is formed slightly larger than the diameter of the head portion 461. That is, the gap Q (see FIG. 6A) formed by the large-diameter portion 471 and the head portion 461 is a slight gap that does not insert a clamping tip portion of a tool that can clamp a member such as a spanner. It is formed as follows. Therefore, a tool such as a wrench becomes harder to insert as the gap Q is smaller. Therefore, it is desirable that the diameter of the large-diameter portion 471 be the smallest diameter that allows the head 461 to rotate.

  6A, the distance S from the head 461 side end of the male screw portion 466 to the recess 490 side end of the female screw portion 481 in a state where the lower surface of the head 461 is in contact with the stepped portion 472. Is less than the height dimension T of the blue laser diode 71 to be held. Even if the fixing bolt 413 is removed and the lens holding member 410 and the fixing member 450 can be separated by any method, the maximum value of the distance is the distance S. Therefore, the blue laser diode 71 having the height dimension T larger than the distance S cannot be taken out between the lens holding member 410 and the fixing member 450.

  Thus, in the fastening structure of the screw member 460 and the like, when one of the fixing male screw portion 467 and the fixing female screw portion 474 and the male screw portion 466 and the female screw portion 481 are screwed, the other is non-screwed. Formed. Therefore, in a state where the screw member 460 is inserted through the through holes 470 and 480 and the recess 490, the fixing male screw portion 467, the fixing female screw portion 474, and the male screw portion 466 and the female screw portion 481 are not screwed together. There will be a case where it becomes a state.

  Next, the fastening method of the fastening structure comprised by the screw member 460 etc. is demonstrated with FIG. 7 (a)-(d) and FIG. First, as shown in FIG. 7A, the fixing member 450 and the heat sink 81 are fixed by the fixing bolt 421, and then the lens holding member 410 and the fixing member 450 are fixed by the fixing bolt 413 so as to hold the blue laser diode 71. A member connecting step (S100 in FIG. 8) is performed.

  Next, as shown in FIG. 7B, the male screw portion 466 of the screw member 460 is inserted into the through hole 470 from the large diameter portion 471, and the male screw portion 466 passes through the female screw portion 474 for fixing, A screwing step (S200 in FIG. 8) for screwing the male screw portion 466 is performed.

  Next, as shown in FIG. 7C, the screw member 460 is continuously rotated to release the screwed state of the female screw part 481 and the male screw part 466, and the male screw part 466 is positioned in the recess 490 ( Step S300 in FIG. 8 is performed.

  Next, as shown in FIG. 7D, a fixing screw screwing step (S400 in FIG. 8) for screwing the fixing male screw portion 467 to the fixing female screw portion 474 is performed, and the screw member 460 is moved to the lens holding member. 410 is fixed.

  In the above embodiment, the winding direction of the fixing male screw portion 467 and the fixing female screw portion 474 (direction of thread cutting (right screw)) is described as the same winding direction as the winding direction of the male screw portion 466 and the female screw portion 481. The winding directions of the two can be opposite to each other. For example, if the winding direction of the male screw portion 466 and the female screw portion 481 is formed in the reverse direction (left screw), the male screw portion 466 and the female screw portion can be released even if the fixing male screw portion 467 and the fixing female screw portion 474 are released. If it is not known that the winding direction of 481 is the reverse direction, it is more difficult to remove the screw member 460.

  The material of the screw member 460 is preferably a non-magnetic material that is not attracted by the magnetized driver.

  Further, the fixing bolt 413 as the first joining member for fixing the lens holding member 410 as the first member and the fixing member 450 as the second member may use other fixing means, for example, an adhesive. it can. Similarly, the fixing bolt 421 as the second joining member can be another fixing means.

  Next, FIG. 9 shows another embodiment according to the present invention. As shown in FIG. 9A, the screw member 560 in the present embodiment is one in which the fixing male screw portion 467 in the above-described embodiment is eliminated and the fixing female screw portion 474 is also eliminated. That is, here, the shaft portion 465 includes a small-diameter shaft portion 468 and a male screw portion 466. Also in the present embodiment, as shown in FIG. 9B, in order to remove the screw member 560, the screw member 560 must be lifted and the male screw portion 466 and the female screw portion 481 must be screwed together. The fixing member 450 is disassembled and it is difficult to take out the blue laser diode 71.

  The screw member 560 is not fixed to any member as it is. Therefore, when this causes a problem, it is preferable that the step 472 of the lens holding member 410 and the lower surface of the head 461 of the screw member 560 are bonded with an adhesive or the like.

  Next, FIG. 10 and FIG. 11 show still another embodiment according to the present invention. In the fastening structure in this embodiment, the lens holding member 410 and the fixing member 450 are fixed by the screw member 660. That is, the screw member 660 is a screw that fastens the lens holding member 410 and the fixing member 450 and makes it difficult to take out the blue laser diode 71 from the excitation light irradiation device 70.

  In the present embodiment, as shown in FIG. 11A which is a cross-sectional view taken along the line XI-XI in FIG. 10, a countersink-shaped through hole 670 is formed in the lens holding member 410. The through hole 670 is formed by a large diameter part 471, a step part 472, and a small diameter part 473. On the other hand, in the through hole 480 of the fixing member 450, a fixing / use female screw portion 482 for fixing the lens holding member 410 and the fixing member 450 is formed on the upper side, and a lower side continuous with the fixing / use female screw portion 482 is a female screw. A portion 481 is formed. The nominal diameter of the female thread portion 481 is a nominal diameter that is equal to or smaller than the nominal diameter of the fixed / used female thread portion 482.

  The shaft portion 465 of the screw member 660 is formed by a fixing male screw portion 667, a male screw portion 466, and a small diameter shaft portion 468. A male screw portion 466 is connected to the tip of the small diameter shaft portion 468. The male screw portion 466 and the female screw portion 481 are formed so as to be capable of being screwed together. A fixing male screw portion 667 for joining and fixing the lens holding member 410 and the fixing member 450 is formed closer to the head 461 than the male screw portion 466 in the small diameter shaft portion 468. The fixing male screw portion 667 is screwed into the fixing / use female screw portion 482 to join and fix the lens holding member 410 and the fixing member 450.

  Here, also in this embodiment, the distance S from the end of the male screw portion 466 on the head 461 side to the end of the female screw portion 481 on the concave portion 490 side is made smaller than the height dimension T of the blue laser diode 71. Yes. Further, the fixing male screw portion 667 and the fixing / use female screw portion 482 and the male screw portion 466 and the female screw portion 481 are formed so that when one is screwed, the other is non-screwed. Therefore, as shown in FIG. 11B, even if the screw member 660 is loosened, the male screw portion 466 and the female screw portion 481 are not started to be screwed together, so that the screw member 660 cannot be removed. Also in this case, since all of the head portion 461 is located in the large diameter portion 471, the screw member 660 cannot be turned and removed while holding the head portion 461 with a spanner or the like.

  As mentioned above, although embodiment of this invention was described, this invention is not limited by the above embodiment. In the above embodiments, the example in which the fastening structure according to the present invention is used for the light source device of the projection apparatus has been described. However, the fastening structure according to the present invention is also applicable to other structures that are difficult to disassemble. Can do. Furthermore, in addition to the fastening structure of the present invention, an adhesive or the like can be used for the screw member for preventing disassembly.

  As described above, according to the embodiment of the present invention, the lens holding member 410 serving as the first member has the through hole 470 as the first through hole including the large diameter portion 471, the step portion 472, and the small diameter portion 473. Provided. The lens holding member 410 is joined to the fixing member 450 serving as the second member from the small diameter portion 473 side. The fixing member 450 is provided with a through hole 480 as a second through hole. The screw member 460 includes a small-diameter shaft portion 468 provided with a male screw portion 466 that can be screwed with a female screw portion 481 formed in the through hole 480, and a head portion 461. The top surface 462 of the head 461 is located within the large-diameter portion 471 at the position where the male screw portion 466 and the female screw portion 481 start to be screwed together.

  Thereby, even if it tries to remove the screw member 460, unless the screw member 460 is lifted and rotated, the screwing of the male screw portion 466 and the female screw portion 481 cannot be started. Here, since the head 461 of the screw member 460 does not protrude from the large-diameter portion 471, the screw member 460 cannot be easily held upward.

  Further, the diameter of the large diameter portion 471 is slightly larger than the diameter of the head portion 461. Thereby, since a tool such as a spanner cannot be inserted into the large-diameter portion 471 and the head 461 cannot be clamped, the screw member 460 can be made more difficult to take out.

  The small-diameter shaft portion 468 is formed with a fixing male screw portion 467 that is screwed with a fixing female screw portion 474 formed in the small-diameter portion 473 of the lens holding member 410. Accordingly, since the screw member 460 is fixed to the lens holding member 410, the screw member 460 is not rattle in a normal state, and the member is fixed even though the screw member 460 is a screw for preventing disassembly. It can also be a dummy screw that cannot be distinguished from the other screw.

  The winding direction of the fixing male screw portion 467 and the fixing female screw portion 474 for fixing the screw member 460 to the lens holding member 410 is opposite to the winding direction of the male screw portion 466 and the female screw portion 481 for preventing disassembly. did. As a result, it is difficult to remove the screw member 460, so that a fastening structure for preventing disassembly can be more suitably implemented.

  Further, the through hole 480 is formed with a fixing / use female screw portion 482 that can be screwed with the fixing male screw portion 667. Thereby, the screw member 660 has both a function for making it difficult to disassemble the fastening structure and a function for fixing the lens holding member 410 and the fixing member 450. Therefore, since all or a part of the bolt only for fastening the lens holding member 410 and the fixing member 450 can be omitted, it is possible to reduce the manufacturing cost.

  In addition, the fastening structure of the present embodiment can be provided with a fixing bolt 413 that is a first joining member that fixes the lens holding member 410 and the fixing member 450 separately from the screw member 460. Thereby, the head of the screw member 460 and the head of the fixing bolt 413 appear on the same surface. Therefore, since it is difficult to determine which screw can be removed, a fastening structure that is more difficult to disassemble can be obtained.

  The fastening structure of the present embodiment further includes a heat sink 81 having a recess 490 aligned with the through hole 480, and the small-diameter shaft portion 468 is inserted through the through holes 470 and 480 and the recess 490, and has a male screw portion. 466 is positioned in recess 490. Accordingly, it is possible to prevent the screw member 460 from approaching from the shaft portion 465 side (downward side).

  In addition, the fastening structure of the present embodiment can be provided with a fixing bolt 421 that is a second joining member that fixes the fixing member 450 and the heat sink 81 separately from the screw member 460. As a result, the fixing member 450 and the heat sink 81 can be reliably fixed, and it is further difficult to approach from below the screw member 460. Since the fixing bolt 421 can be covered by the lens holding member 410, it cannot be approached from the upper surface side of the lens holding member 410. Accordingly, a fastening structure that is more difficult to disassemble can be obtained.

  Further, a blue laser diode 71 as a member to be held is sandwiched and held between the lens holding member 410 and the fixing member 450. Thereby, about the to-be-held member which is a member which does not want to be taken out, it can be set as a suitable fastening structure.

  Further, the height T of the blue laser diode 71 that is a member to be held is such that the head 461 side of the male screw portion 466 is in the state where the head portion 461 of the screw member 460 is in contact with the stepped portion 472 and the female screw portion 481 It was formed larger than the distance S to the end of the concave portion 490. As a result, even if the lens holding member 410 and the fixing member 450 can be separated, the interval is smaller than the height dimension T, so that a fastening structure in which it is difficult to take out the member to be held can be obtained.

  Moreover, in this embodiment, it was set as the excitation light irradiation apparatus 70 comprised by the blue laser diode 71 as a to-be-held member. Thereby, it is possible to apply a fastening structure in which it is difficult to take out the laser diode with respect to the light source device 60 using the laser diode that is intentionally taken out and is used for other purposes and is not misused.

  Moreover, the projection apparatus 10 has the light source device 60 in which the blue laser diode 71 is provided in the excitation light irradiation device 70 having the fastening structure according to the present invention. A display element 51, a projection-side optical system 220, and a projection device control unit are provided. As a result, it is possible to obtain the projection apparatus 10 having a fastening structure that is difficult to take out with respect to the blue laser diode 71 that is a member that is disassembled and is not desired to be taken out.

  The fastening method of these members includes a member joining step of joining the lens holding member 410, the fixing member 450, the heat sink 81, the collimator lens 73, and the blue laser diode 71 with fixing bolts 413, 421, a male screw portion 466, and a female screw portion 481. And a screwing releasing step of positioning the male screw portion 466 in the recess 490 with the male screw portion 466 and the female screw portion 481 in a non-screwing state. Thereby, the fastening structure in which the lens holding member 410, the fixing member 450, and the heat sink 81 are hardly disassembled by the screw member 460 can be obtained.

  Further, the fastening method of these members is a fixing screw screwing step of screwing the fixing male screw portion 467 and the fixing female screw portion 474 so as to fix the screw member 460 to the lens holding member 410 after the screwing releasing step. Have Thereby, the screw member 460 can be fixed to the lens holding member 410. Therefore, the screw member 460 can be fixed to the lens holding member 410 to prevent the screw member 460 from rattling during normal use.

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

The invention described in the first claim of the present application will be appended below.
[1] a large diameter portion;
A stepped portion connected to the large diameter portion;
A first through hole formed by the small diameter portion connected to the step portion;
A first member having:
A second member that communicates with the first through hole and has a second through hole in which an internal thread portion is formed, and is joined to the first member from the small diameter portion side;
The head,
A shaft extending from the head, and
The shaft portion includes a small-diameter shaft portion, and a male screw portion connected to the opposite side of the head portion of the small-diameter shaft portion,
A screw member having
With
The diameter of the small diameter shaft portion is smaller than the diameter of the valley of the male screw portion,
The fastening structure, wherein the top surface of the head in a state in which the male screw portion is inserted through the second through hole is located in the large diameter portion.
[2] The fastening structure according to [1], wherein a diameter of the large-diameter portion is slightly larger than a diameter of the head.
[3] A fixing male screw portion for fixing the screw member to the head side of the small diameter shaft portion is formed on the shaft portion,
The small-diameter portion is formed with a fixing female screw portion that is screwed with the fixing male screw portion to fix the screw member,
The nominal diameter of the male screw portion and the female screw portion is equal to or less than the nominal diameter of the fixing male screw portion and the fixing female screw portion,
The screwed state and the non-screwed state of the fixing male screw part, the fixing female screw part, and the male screw part and the female screw part are such that when one is screwed, the other is non-screwed. The fastening structure according to [1] or [2].
[4] The fastening structure according to [3], wherein a winding direction of the fixing male screw portion and the fixing female screw portion is opposite to a winding direction of the male screw portion and the female screw portion.
[5] The fastening structure according to [3] or [4], wherein the second through-hole has a fixing / use female screw portion formed so as to be screwable with the fixing male screw portion.
[6] The fastening structure according to any one of [1] to [5], wherein the first member is fixed to the second member by a first joining member.
[7] A third member having a recess aligned with the second through-hole and joined to the second member;
The shaft portion is inserted through the first through hole, the second through hole, and the concave portion, and the male screw portion is positioned in the concave portion. The fastening structure according to any one of [6].
[8] The fastening structure according to any one of [1] to [7], wherein the second member is fixed to the third member by a second bonding member.
[9] The [1], wherein a held member that is sandwiched between the first member and the second member is provided between the first member and the second member. Thru | or the fastening structure in any one of said [8].
[10] The height dimension of the held member is larger than the distance from the head side end of the male screw portion to the female screw portion in a state where the head is in contact with the stepped portion. The fastening structure according to [9].
[11] The fastening structure according to [9] or [10], wherein the held member is a laser diode.
[12] A light source device having the fastening structure according to any one of [9] to [11];
A display element that is irradiated with light source light from the light source device to form image light;
A projection-side optical system that projects the image light emitted from the display element onto a screen;
A projection apparatus comprising:
[13] A first member having a large-diameter portion, a step portion connected to the large-diameter portion, and a first through hole formed by a small-diameter portion connected to the step portion, A member joining step that joins the second member having a second through hole that is communicated with the small diameter portion and in which the female screw portion is formed;
A screw having a head and a shaft extending from the head, the shaft having a small-diameter shaft and a male screw portion connected to the opposite side of the head of the small-diameter shaft. A screwing step of screwing the male screw part and the female screw part of the member;
A screwing releasing step of bringing the male screw part and the female screw part into a non-screwing state;
The fastening method characterized by having.
[14] The shaft portion is formed with a fixing male screw portion for fixing the screw member closer to the head side than the small-diameter shaft portion.
The small diameter portion is formed with a fixing female screw portion to which the screw member is fixed,
After the screw release step, a fixing screw screwing step for screwing the fixing male screw portion and the fixing female screw portion;
The fastening method according to [13], further comprising:

DESCRIPTION OF SYMBOLS 10 Projector 11 Top panel 12 Front panel 13 Back panel 14 Right panel 15 Left panel 17 Exhaust hole 18 Intake hole 19 Lens cover 21 Input / output connector part 22 Input / output interface 23 Image conversion part 24 Display encoder 25 Video RAM
26 Display drive unit 31 Image compression / decompression unit 32 Memory card 35 Ir reception unit 36 Ir processing unit 37 Key / indicator unit 38 Control unit 41 Light source control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Audio processing unit 48 Speaker 51 Display Element 60 Light source device 70 Excitation light irradiation device 71 Blue laser diode 73 Collimator lens 75 Reflective mirror group 76 Mirror substrate 78 Condensing lens 80 Green light source device 81 Heat sink 100 Fluorescent wheel device 101 Fluorescent wheel 107 Condensing lens group 110 Wheel motor 115 Collection Optical lens 120 Red light source device 121 Red light source 125 Condensing lens group 130 Heat sink 140 Light guiding optical system 141 First dichroic mirror 143 First reflecting mirror 145 Second reflecting mirror 146 Condensing lens 147 Collection Optical lens 148 Second dichroic mirror 149 Condensing lens 170 Light source side optical system 173 Condensing lens 175 Light tunnel 178 Condensing lens 181 Optical axis conversion mirror 183 Condensing lens 185 Irradiation mirror 190 Heat sink 195 Condenser lens 220 Projection side optical system 225 Fixed lens group 235 Movable lens group 241 Control circuit board 261 Cooling fan 410 Lens holding member 411 Screw hole 412 Lens mounting hole 413 Fixing bolt 414 Countersink hole 415 Mounting part 420 Lens holder 421 Fixing bolt 422 Screw hole 423 Screw hole 424 hole 450 fixing member 451 LD mounting portion 452 screw hole 460 screw member 461 head 462 top surface 465 shaft portion 466 male screw portion 467 fixing male screw portion 468 small diameter shaft portion 470 through hole 471 large diameter portion 472 Step part 473 Small diameter part 474 Fixing female screw part 480 Through hole 481 Female screw part 482 Fixing and female screw part 490 Recess 560 Screw member 660 Screw member 667 Fixing male screw part 670 Through hole

Claims (14)

A large diameter part,
A stepped portion connected to the large diameter portion;
A first through hole formed by the small diameter portion connected to the step portion;
A first member having:
A second member that communicates with the first through hole and has a second through hole in which an internal thread portion is formed, and is joined to the first member from the small diameter portion side;
The head,
A shaft extending from the head, and
The shaft portion includes a small-diameter shaft portion, and a male screw portion connected to the opposite side of the head portion of the small-diameter shaft portion,
A screw member having
With
The diameter of the small diameter shaft portion is smaller than the diameter of the valley of the male screw portion,
The fastening structure, wherein the top surface of the head in a state in which the male screw portion is inserted through the second through hole is located in the large diameter portion.   The fastening structure according to claim 1, wherein a diameter of the large-diameter portion is slightly larger than a diameter of the head. The shaft portion is formed with a fixing male screw portion for fixing the screw member on the head side with respect to the small diameter shaft portion,
The small-diameter portion is formed with a fixing female screw portion that is screwed with the fixing male screw portion to fix the screw member,
The nominal diameter of the male screw portion and the female screw portion is equal to or less than the nominal diameter of the fixing male screw portion and the fixing female screw portion,
The screwed state and the non-screwed state of the fixing male screw part, the fixing female screw part, and the male screw part and the female screw part are such that when one is screwed, the other is non-screwed. The fastening structure according to claim 1 or 2.   The fastening structure according to claim 3, wherein a winding direction of the fixing male screw portion and the fixing female screw portion is opposite to a winding direction of the male screw portion and the female screw portion.   5. The fastening structure according to claim 3, wherein the second through hole has a fixing / use female screw portion formed so as to be screwable with the fixing male screw portion.   The fastening structure according to claim 1, wherein the first member is fixed to the second member by a first joining member. A concave member aligned with the second through hole, and further comprising a third member joined to the second member;
The shaft portion is inserted through the first through hole, the second through hole, and the concave portion, and the male screw portion is positioned in the concave portion. Item 7. The fastening structure according to any one of items 6 to 9.   The fastening structure according to any one of claims 1 to 7, wherein the second member is fixed to the third member by a second joining member.   9. A held member that is sandwiched between the first member and the second member is provided between the first member and the second member. The fastening structure according to any one of the above.   The height dimension of the held member is larger than a distance from the head-side end of the male screw portion to the female screw portion in a state where the head is in contact with the stepped portion. The fastening structure described in 1.   The fastening structure according to claim 9, wherein the held member is a laser diode. A light source device having the fastening structure according to any one of claims 9 to 11,
A display element that is irradiated with light source light from the light source device to form image light;
A projection-side optical system that projects the image light emitted from the display element onto a screen;
A projection apparatus comprising: A first member having a large diameter portion, a step portion connected to the large diameter portion, and a first through hole formed by the small diameter portion connected to the step portion; and the small diameter portion; A member joining step for joining a second member having a second through hole that is communicated and has a female screw portion formed;
A screw having a head and a shaft extending from the head, the shaft having a small-diameter shaft and a male screw portion connected to the opposite side of the head of the small-diameter shaft. A screwing step of screwing the male screw part and the female screw part of the member;
A screwing releasing step of bringing the male screw part and the female screw part into a non-screwing state;
The fastening method characterized by having. The shaft portion is formed with a fixing male screw portion for fixing the screw member on the head side with respect to the small-diameter shaft portion,
The small diameter portion is formed with a fixing female screw portion to which the screw member is fixed,
After the screw release step, a fixing screw screwing step for screwing the fixing male screw portion and the fixing female screw portion;
The fastening method according to claim 13, further comprising:

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