JP5045993B2 - Light guiding unit and projector - Google Patents

Description

  The present invention relates to a light guide unit capable of firmly fixing a light guide rod, and a projector that projects an image based on a video signal or the like provided with the light guide unit.

  2. Description of the Related Art Today, data projectors are widely used as image projection apparatuses that project a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen.

  This data projector incorporates a high-intensity light source device such as a metal highland lamp or an ultra-high pressure mercury lamp, condenses the light emitted from this light source on a micromirror display element called DMD, or a liquid crystal plate, A color image is displayed on the screen.

  Many projectors using light guide devices such as light tunnels and light guide rods have been proposed in order to make the intensity of light emitted from the light source device uniform. For example, in Japanese Patent Application Laid-Open No. 2006-208894 (Patent Document 1), three light sources in which a plurality of light emitting diodes are arranged in an array are arranged on three sides of a cross dichroic mirror, and the light flux emitted from the cross dichroic mirror is There has been proposed an invention in which light emitted from a plurality of bright spots is synthesized by arranging a vertically long and truncated pyramid shaped light guide rod on the optical axis.

Since the side surface of the light guide rod is a reflecting surface, it is necessary to reduce the area of contact between the side surface and the fixture when the light guide rod is fixed. Therefore, a currently common light guide rod fixing method is to fix the light guide rod by pressing the side surface with a leaf spring or a holding member.
JP 2006-208894 A

  Since the light guide rod fixing method as described above is fixed only by the frictional force between the side surface of the light guide rod and the leaf spring or the holding member, a displacement occurs when force is applied in the optical axis direction. There was a problem. This misalignment of the light guide rod causes the defocus of the light beam incident on the subsequent optical system, which cannot be effectively focused on a display element such as a DMD, and causes various problems. Yes.

  The present invention has been made in view of the above problems of the prior art, and provides a light guide unit capable of firmly fixing a light guide rod in a predetermined position and a projector including the light guide unit. It is aimed.

The light guide unit of the present invention is a cylindrical body including a wedge-shaped light guide rod having different areas of the incident surface side end surface and the exit surface side end surface, and a plurality of locking protrusions for locking the light guide rod on the inner surface. A holding member, and a locking plate for fixing the light guide rod to the holding member, wherein one of the side surfaces of the light guide rod becomes a tapered surface with respect to a center surface of the light guide rod, The other side surface is formed as a surface perpendicular to the incident surface or the exit surface, and one side surface which is a tapered surface among the side surfaces of the light guide rod and the incident surface which is the other side surface of the light guide rod or The plurality of locking projections are in contact with a surface formed as a surface perpendicular to the emission surface .

The projector according to the present invention includes a light source device, a light guide unit, a light source side optical system, a display element, a projection side optical system, a cooling fan, and a projector control unit. A cylindrical-shaped holding member having a wedge-shaped light guide rod having different areas of the incident surface side end surface and the exit surface side end surface, a plurality of locking protrusions for locking the light guide rod on the inner surface, and the light guide A locking plate for fixing the rod to the holding member, wherein one of the side surfaces of the light guide rod is a tapered surface with respect to the center surface of the light guide rod, and the other side surface of the light guide rod is the incident surface. Alternatively, as a surface perpendicular to the exit surface and formed as one of the tapered side surfaces of the light guide rod and the other surface of the light guide rod as the incident surface or exit surface. The plurality of the formed surfaces It is an wherein the locking projection is in contact.

  ADVANTAGE OF THE INVENTION According to this invention, the light guide unit which can fix a light guide rod firmly to a predetermined position, and a projector provided with the said light guide unit can be provided.

  The projector 1 of the best mode for carrying out the present invention includes a light source device 61, a light guide unit 80, a light source side optical system 70, a display element 51, a projection side optical system 90, a cooling fan 111, Projector control means 101.

  The light guide unit 80 also has a wedge-shaped light guide rod 81 having a smaller area on the exit surface side than the entrance surface side, a square entrance surface and a horizontally elongated exit surface, and a light guide rod on the inner surface. A cylindrical holding member 82 having a plurality of locking projections 84 for locking 81 and a locking plate 83 for fixing the light guide rod 81 to the holding member 82 are provided.

  The holding member 82 has an inner surface shape substantially similar to that of the light guide rod 81, and the locking plate 83 has a square-shaped opening larger than the incident surface of the light guide rod 81, and at least two of the openings. In the vicinity of the corner, a locking portion 85 that overlaps the incident surface of the light guide rod 81 and locks the corner of the light guide rod 81 is provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A projector 1 according to the present invention incorporates a control circuit as a projector control means, and has a projection port 93 provided with a lens cover 92 on a front plate 3 of a case that is a substantially rectangular parallelepiped as shown in FIG. It is.

  On the top plate 2 of the case, there are keys and indicators such as a power switch 10, a manual image quality adjustment key 12, an automatic image quality adjustment key 13, a power lamp indicator 11, a light source lamp indicator 14, an overheat indicator 15, and a speaker. It has a loudspeaker hole 16 and an open / close lid 17 on the inside, and a back plate (not shown) inputs various signals such as a power connector, a USB terminal connected to a personal computer, a video terminal for video signal input, and a mini D-sub terminal. It has a terminal.

  The upper opening / closing lid 17 has sub-keys for fine adjustment of image quality and image and various operation settings of the projector 1, an intake hole on the left side plate of the case, and an exhaust hole 8 on the right side plate 5. Is provided and has a cooling fan inside.

  In addition, the front plate 18 has a front foot member 18 that can adjust the amount of protrusion, and the rear plate has a fixed rear foot member 19 on the left and right of the bottom plate. By changing the front height of the projector 1, an image can be projected according to the height of the screen.

  As shown in FIG. 2, the control circuit as the projector control means of the projector 1 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. Thus, the image signals of various standards input from the input / output connector unit 21 are unified into image signals of a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). After being converted to, it is sent to the display encoder 24.

  The display encoder 24 develops and stores the transmitted 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 drive unit 26.

  A display drive unit 26 to which a video signal is input from the display encoder 24 drives a display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal sent. Yes, the light from the light source device 61 is incident on the display element 51 through various optical systems, thereby forming an optical image with the reflected light of the display element 51, and through the projection system lens group serving as the projection side optical system. An image is projected and displayed on a screen (not shown), and the movable lens group 97 of this projection system lens group is driven by a lens motor 45 for zoom adjustment and focus adjustment.

  In addition, the image compression / decompression unit 31 performs a recording process for sequentially writing a luminance signal and a color difference signal of an image signal to a memory card 32 that is a removable recording medium by performing data compression by processing such as ADTC and Huffman coding. In the mode, the image data recorded on the memory card 32 is read, and individual image data constituting a series of moving images is expanded in units of one frame and sent to the display encoder 24 via the image conversion unit 23. A moving image or the like can be displayed based on the stored image data.

  The control unit 38 controls operation of each circuit in the projector 1, and includes a ROM that stores operation programs such as a CPU and various settings in a fixed manner, and a RAM that is used as a work memory. ing.

  Further, the operation signal of the key / indicator unit 37 composed of the main key and the indicator provided on the upper surface plate 2 of the main body case is directly sent to the control unit 38, and the 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 sent to the control unit 38.

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

  The control unit 38 controls a power supply control circuit 41. The power supply control circuit 41 turns on the discharge lamp of the light source device 61 when the lamp switch key is operated. Further, the control unit 38 also controls a cooling fan drive control circuit 43. The cooling fan drive control circuit 43 performs temperature detection by a plurality of temperature sensors provided in the light source device 61, etc. The rotation speed is controlled and the rotation of the cooling fan is continued even after the lamp of the light source device 61 is turned off by a timer or the like. Further, depending on the result of temperature detection by the temperature sensor, the light source device 61 is stopped and the projector body It also performs control such as turning off the power of the.

  As shown in FIG. 3, a circuit board 103 provided with projector control means 101 and a lamp power supply circuit 102 is disposed in the vicinity of the front plate 3 inside the projector 1. A cooling fan 111 is disposed in the vicinity of the exhaust hole 8 of the right side plate 5 and in the vicinity of the back plate 4. Further, a plurality of air intake holes 9 are formed in the left side plate 6 so that outside air can be taken into the projector 1.

  Further, a light source device 61 incorporating a discharge lamp 62 such as a high-pressure halogen lamp, a light source side optical system 70 including a color wheel 86, a light guide rod 81, a plurality of light source side lens groups, and the like, and a reflection mirror It has 88 mag.

  A display element 51 that displays an image by controlling the reflection of incident light by arranging a plurality of pixels in a matrix in the row direction and the column direction at a position where the reflected light from the reflecting mirror 88 is irradiated. Has been placed. A projection-side optical system 90 including a fixed lens group 98 and a movable lens group 97 that project light emitted from the display element 51 onto a projection surface such as a screen is disposed in the vicinity of the left side plate 6.

  The display element 51 is a display element 51 that does not have a means for coloring incident light such as a color filter. In this embodiment, a micromirror display element generally abbreviated as DMD (Digital Micromirror Device) is used. . The horizontal to vertical ratio of the micromirror display element is usually 4 to 3.

  The micromirror display element is configured to convert light incident from an incident direction tilted in one direction with respect to the front direction into front-state on-state rays and oblique off-state rays by switching the tilt directions of the plurality of micromirrors. The light is incident on the micromirror tilted in one tilt direction and is turned into an on-state light beam reflected in the front direction by the micromirror, and is reflected in the other tilt direction. The light incident on the tilted micromirror is reflected by the micromirror in an oblique direction to form an off-state light beam, and the off-state light beam is absorbed by the light-absorbing plate. An image is displayed by dark display by reflection on the screen.

  The light source device 61 includes a discharge lamp 62 such as a high-pressure halogen lamp, a spheroidal reflector 63 whose inner surface is a reflection surface, and an explosion-proof filter that closes an opening in front of the reflector 63. The lead wire 74 is connected to the lamp power supply circuit 102 to supply power to the discharge lamp 62.

  The color wheel 86 has a thin disk shape and has a color filter on the plane for sequentially coloring the white light emitted from the light source device 61. The color filter is disposed on the optical axis X at a position on the incident side of the light guide rod 81. The center is connected to the wheel motor 87 and the rotation is controlled.

  Further, as shown in FIG. 4A, the light guide rod 81 has a wedge shape in which the area on the exit surface side is smaller than the entrance surface side. A light guide unit 80 having a holding member 82 having a locking projection 84 on the inner surface and a locking plate 83 for fixing the light guide rod 81 to the holding member 82. It is.

  The light guide rod 81 is a wedge-shaped optical glass having an entrance surface and an exit surface that are parallel to each other and having a smaller area on the exit surface side than the entrance surface side. The entrance surface is square and the exit surface is horizontally long. The two upper and lower surfaces facing each other among the four side surfaces that form the reflecting surface are tapered surfaces that are symmetrical with respect to the central surface that bisects the upper and lower sides of the light guide rod 81, and the left and right side surfaces are parallel to each other. It is formed perpendicular to the entrance surface and exit surface. Then, the light beam emitted from the light source device 61 is taken in from the incident surface to make the intensity uniform, and the light beam is emitted from the emission surface to the subsequent optical system.

  The holding member 82 is a cylindrical body whose outer surface is a rectangular parallelepiped shape and whose inner surface shape is substantially similar to the light guide rod 81, and the length in the optical axis X direction is substantially the same as the length of the light guide rod 81. It is formed. In addition, a plurality of locking projections 84 that lock the light guide rod 81 so as to support it are formed at predetermined positions on the inner surface. The holding member 82 holds the light guide rod 81 in the internal space. When the light guide rod 81 is inserted into the internal space of the holding member 82, the locking projection 84 contacts the side surface of the light guide rod 81. Thus, the light guide rod 81 is fixed.

  The locking projection 84 is formed so as to protrude from a predetermined position on the inner surface of the holding member 82, and the leading end portion of the locking projection 84 has a surface shape and is inserted into the holding member 82. It is formed in parallel with the side surface. Therefore, the locking protrusion 84 that locks the tapered surface of the light guide rod 81 is formed with the tip portion inclined with respect to the optical axis X by the taper angle, and the side surface formed in parallel with the light guide rod 81. The tip end portion of the locking projection 84 that locks is formed in parallel with the optical axis X. Thus, by forming the locking projection 84 so as to be in surface contact with the light guide rod 81, the lock with the light guide rod 81 becomes strong, and the contact area with the outer surface of the light guide rod 81 Can be reduced.

  The locking plate 83 is a thin plate that can be bent, and has a rectangular opening larger than the incident surface of the light guide rod 81. As shown in the drawing, this opening is provided with a locking portion 85 that locks the vicinity of the corner of the incident surface, and may be octagonal or quadrangular, with a light guide rod at the center of the opening. The light guide rod 81 is fixed by positioning the center of the incident surface of 81 and overlapping the locking portion 85 of the locking plate 83 at the corner of the incident surface of the light guide rod 81.

  The light guide unit 80 then inserts the light guide rod 81 into the internal space of the holding member 82 from the exit surface side of the light guide rod 81 to a position where the side surface of the light guide rod 81 contacts the locking projection 84. The incident surface side of the optical rod 81 is pressed by the locking plate 83, and the peripheral portion of the locking plate 83 is bent and fixed to the outer peripheral edge of the holding member 82. At this time, as shown in FIG. 4B, the engaging portion 85 of the engaging plate 83 is engaged in the vicinity of the corner of the incident surface of the light guide rod 81.

  When the light guide rod 81 is fixed in this way, the light guide rod 81 has a divergent shape from the exit surface side to the entrance surface side, so the light guide rod 81 does not shift to the exit surface side, and the entrance surface Since the side is fixed by the locking plate 83, it does not shift to the incident surface side.

  Further, when the vicinity of the corner of the incident surface of the light guide rod 81 is fixed by the locking portion 85 of the locking plate 83, the light irradiated to the vicinity of the corner of the incident surface of the light guide rod 81 is blocked, but the light is guided. The light applied to the incident surface of the optical rod 81 is a light bundle emitted from the reflector 63 of the light source device 61. Since this light bundle is light converged by the spheroid reflector 63, it is substantially circular. The amount of light radiated near the corner of the incident surface of the light guide rod 81 is essentially small, so the amount of light incident on the light guide rod 81 even if the corner is covered with the locking plate 83 It will not decrease.

  Since the light guide rod 81 has a wedge shape with a smaller area on the exit surface than the entrance surface, the angle formed by the light beam emitted from the light guide rod 81 and the optical axis X is incident on the light guide rod 81. When the light beam bundle at the time is larger than the angle formed by the optical axis X, and the angle formed by the tapered surface of the light guide rod 81 and the optical axis X is increased, the subsequent light in the light beam emitted from the light guide rod 81 Diffuse light that cannot enter the system increases. Therefore, it is necessary to make the angle formed by the tapered surface and the optical axis X small.

  The light source side lens group in the light source side optical system 70 condenses the light bundle transmitted through the color wheel 86 and the light guide rod 81, eliminates diffused light that becomes unnecessary light, etc., and applies the light bundle to the reflection mirror 88. Irradiation.

  The reflection mirror 88 reflects the light emitted from the light source device 61 and transmitted through the light guide rod 81, the color wheel 86, and the light source side lens group toward the display element 51, thereby causing the display element 51 to have a front surface. Light is projected from a direction inclined in one direction with respect to the direction.

  The projection-side optical system 90 includes a fixed lens barrel containing a fixed lens group 98 and a movable lens group 97 which is engaged with the fixed lens barrel and can move forward and backward in the axial direction by a rotating operation. The projection-side optical system 90 includes a lens barrel and forms a zoom lens by a combination of a plurality of lenses incorporated in these lens barrels.

  As described above, the projector 1 emits light from the light source device 61 in one direction and rotates the color wheel 86 at a high speed, so that the light is incident on the incident surface of the light guide rod 81 from the light source device 61. The light emitted from the exit surface of 81 is made uniform in intensity distribution by the light guide rod 81, further colored sequentially by the color wheel 86, and projected toward the display element 51 by the light source side optical system 70 and the reflection mirror 88. It is something that can be done.

  Then, when light from the light source device 61 is stabilized after a predetermined time has elapsed since the power was turned on, the single color of each color is displayed on the display element 51 in synchronization with the projection period of the light of each color that has been transmitted through the color wheel 86. By sequentially writing the image data, a single color image of each color is sequentially formed on the display element 51 by the on-state light beam reflected in the front direction of the display element 51, and single color image light of each color sequentially emitted from the display element 51 is projected. The image is enlarged and projected onto the projection plane by the lens groups 97 and 98 of the side optical system 90, and a full-color image in which three color single-color images are superimposed on the projection plane is displayed.

  According to the light guide unit 80 of the present embodiment, when a force in the optical axis X direction of the light guide rod 81 is applied to the light guide rod 81, the tapered surface of the light guide rod 81 is the holding member 82 in the exit surface direction. Since the engaging projection 84 is engaged with the engaging projection 84, there is no deviation, and the incident surface direction is not displaced because the incident surface is engaged with the engaging plate 83. Therefore, even if a force in the optical axis X direction is applied, the light guide rod 81 will not be displaced, and the defocus of the light beam incident on the subsequent optical system caused by the displacement of the light guide rod 81 and the projected image will be unclear. In addition, the light cannot be effectively condensed on a display element such as a DMD, and various problems can be prevented.

  Further, since the light guide rod 81 is locked by the locking protrusion 84, the area where the side surface of the light guide rod 81 and the holding member 82 are in contact with each other is small, and the refractive index of the light guide rod 81 is hardly affected. Therefore, attenuation of the amount of light in the light guide rod 81 can be prevented. Further, if a reflecting surface such as a mirror coat is formed on the surface of the locking projection 84 that contacts the side surface of the light guide rod 81, the light quantity in the light guide rod 81 can be further prevented from being attenuated.

  Then, the upper and lower side surfaces of the light guide rod 81 are tapered surfaces that are symmetrical with respect to the upper and lower center planes of the light guide rod 81, so that the optical axis of the light bundle incident on the light guide rod 81 and the light bundle emitted. Since they are on the same straight line, it is easy to align the optical axes.

  It is also possible to form the tip of the locking projection 84 in a hemispherical shape so as to make point contact with the side surface of the light guide rod 81. By forming the light guide rod 81 in this way, the area in contact with the light guide rod 81 can be reduced. Therefore, the light quantity in the light guide rod 81 can be prevented from being attenuated without affecting the refractive index of the light guide rod 81.

  Further, by forming the inner surface shape of the holding member 82 substantially similar to the shape of the light guide rod 81, the protruding amount of the locking projection 84 can be made constant, and the locking projection 84 can be easily formed. Become.

  Further, since the locking plate 83 fixes the light guide rod 81 by locking the vicinity of the corner of the incident surface of the light guide rod 81, the circular shape that is irradiated to the incident surface of the light guide rod 81 and becomes effective light Does not block the light flux. Therefore, it is possible to provide a projected image with high brightness without reducing the amount of light.

  Further, by making the incident surface of the light guide rod 81 square, it is possible to take in a circular beam bundle irradiated to the light guide rod 81 without waste, and to improve the utilization efficiency of the light emitted from the light source device 61. The light guide rod 81 and thus the light guide unit 80 can be downsized without lowering.

  Furthermore, by making the exit surface of the light guide rod 81 a horizontally long rectangle, a light bundle having a shape close to the shape of the projected image that is a horizontally long rectangle can be emitted to the subsequent optical system. This reduces the wasted light in the optical system.

  Further, in the projector 1 using such a light guide unit 80, since the light guide rod 81 is firmly fixed, the optical axis does not shift even when an impact is applied, and stable projection can be continued. .

  In this embodiment, the locking plate 83 is a thin plate having an opening. However, a light-transmitting thin plate having no opening and having a small refractive index may be used. Thus, since it is not necessary to form an opening by using a thin plate with a small refractive index, the locking plate 83 can be easily manufactured.

  Further, although the locking portions 85 are formed at the four corners of the opening of the locking plate 83, the locking portions 85 are formed only at the two corners, or the shape of the opening is slightly smaller than the shape of the incident surface. It is also possible to make the shape small so that the edge of the incident surface of the light guide rod 81 is locked.

  And, since the projector 1 using such a light guide unit 80 can prevent the light guide rod 81 from being displaced in the optical axis direction, even if an impact is applied, the optical axis is not displaced, and is resistant to the impact. Stable projection is possible.

  Next, modifications of the present invention will be described. As shown in FIG. 5, the light guide rod 81 of the present modification is a wedge-shaped light guide rod having a parallel entrance surface and an exit surface, and having an exit surface area smaller than the entrance surface area. The surface located below is a tapered surface, and the surface located on the upper side and the left and right side surfaces are formed as surfaces perpendicular to the entrance surface and the exit surface.

Thus, by making the tapered surface only one surface, the light guide rod 81 can be firmly fixed and the light guide rod 81 can be easily processed.
The tapered surface can be three or four surfaces, and the light guide rod 81 can be firmly fixed by increasing the tapered surface.

  Another modification will be described. In the embodiment described above, the incident surface of the light guide rod 81 is a square and the exit surface is a horizontally long rectangle. However, as shown in FIG. 6, the entrance surface and the exit surface are both of a horizontally long rectangle. You can also.

  Thus, by making the incident surface also a horizontally long rectangle, the angle formed by the tapered surface of the light guide rod 81 and the optical axis X can be reduced, and the angle formed by the light beam emitted from the light guide rod 81 and the optical axis X. Since the unnecessary light generated after passing through the light guide rod 81 can be reduced, the utilization efficiency of the light bundle emitted from the light source device 61 is increased.

  The taper angle may be 1 ° or less or 0.5 ° or less so that the diffusion angle of light emitted from the exit surface does not increase.

  In the above-described embodiment, the area on the incident surface side is large and the area on the exit surface side is small. However, the direction of the side taper is reversed to increase the area of the exit surface and the area on the incident surface side. Can be made smaller. Thus, by forming the area of the exit surface large and the area on the entrance surface side small, the light guide rod 81 can be firmly fixed and at the same time the diffusion angle of the light beam emitted from the light guide rod 81 can be reduced. it can.

  In addition, the inner surface shape of the holding member 82 is formed to be substantially similar to the shape of the light guide rod 81, but the inner surface shape of the holding member 82 is a rectangular parallelepiped shape, and the protruding amount of the locking projection 84 is the side surface of the light guide rod 81. The light guide rod 81 can be fixed by adjusting so as to be locked.

  In this way, by making the inner surface shape of the holding member 82 a rectangular parallelepiped shape and changing the protruding amount of the locking projection 84, it is not necessary to form a tapered surface or the like on the inner surface of the holding member 82, so that the manufacturing is facilitated.

  In addition, this invention is not limited to the form of the above Example, A change and improvement are possible freely in the range which does not deviate from the summary of invention.

1 is a perspective view of a projector according to an embodiment of the invention. FIG. 3 is a control block diagram of the projector according to the embodiment of the invention. 1 is a schematic diagram schematically showing the inside of a projector according to an embodiment of the invention. Sectional drawing of the light guide unit which concerns on the Example of this invention, and the front view from the entrance plane side. Sectional drawing of the light guide unit which concerns on the modification of this invention, and the front view from the entrance plane side. Sectional drawing of the light guide unit which concerns on the other modification of this invention, and the front view from the entrance plane side.

Explanation of symbols

1 Projector 2 Top plate
3 Front plate 4 Back plate
5 Right side plate 6 Left side plate
8 Exhaust hole 9 Intake hole
10 Power switch 11 Power indicator
12 Manual image quality adjustment key 13 Automatic image quality adjustment key
14 Light source indicator 15 Overheat indicator
16 Loudspeaker 17 Open / close lid
18 Forefoot member 19 Rear foot member
21 I / O connector 22 I / O interface
23 Image converter 24 Display encoder
25 Video RAM 26 Display driver
31 Image compression / decompression unit 32 Memory card
35 Ir receiver 36 Ir processor
37 Key / Indicator section 38 Control section
41 Power supply control circuit 43 Cooling fan drive control circuit
45 Lens motor
47 Audio processor 48 Speaker
51 Display element 61 Light source device
62 Discharge lamp 63 Reflector
70 Light source side optical system 74 Lead wire
80 Light guide unit
81 Light guide rod 82 Holding member
83 Locking plate 84 Locking protrusion
85 Locking part 86 Color wheel
87 Wheel motor 88 Reflective mirror
90 Projection-side optical system 92 Lens cover
93 Projection port 97 Movable lens group
98 Fixed lens group 101 Projector control means
102 Lamp power circuit 103 Circuit board
111 Cooling fan

Claims (8)

A wedge-shaped light guide rod having different areas of the incident surface side end surface and the exit surface side end surface;
A cylindrical body holding member comprising a plurality of locking projections for locking the light guide rod on the inner surface;
A locking plate for fixing the light guide rod to the holding member,
One of the side surfaces of the light guide rod is a tapered surface with respect to the center surface of the light guide rod, and the other side surface of the light guide rod is formed as a surface perpendicular to the incident surface or the exit surface ,
The plurality of locking protrusions on a side surface formed as a tapered surface among the side surfaces of the light guide rod and a surface formed as a surface perpendicular to the incident surface or the exit surface, which is the other side surface of the light guide rod A light guide unit characterized by being in contact with each other.   2. The light guide unit according to claim 1, wherein the light guide rod has both an entrance surface and an exit surface that are horizontally long, and the exit surface is smaller than the entrance surface.   2. The light guide unit according to claim 1, wherein the light guide rod is formed in a smaller area than the entrance surface, with the entrance surface being a square and the exit surface being a horizontally long rectangle.   The light guide unit according to any one of claims 1 to 3, wherein the holding member has an inner surface shape substantially similar to that of the light guide rod.   The locking plate has a rectangular opening larger than the incident surface of the light guide rod, and a locking portion that locks the corner of the incident surface of the light guide rod in the vicinity of at least two corners of the opening. The light guide unit according to any one of claims 1 to 4, further comprising: The locking plate is a light guide unit according to any one of claims 1 to 4, characterized in that it is not transparent thin plate aperture.   The light guide unit according to any one of claims 1 to 6, wherein a reflection surface is formed on a surface of the locking protrusion that contacts the side surface of the light guide rod. A light source device;
A light guide unit;
A light source side optical system;
A display element;
A projection-side optical system;
A cooling fan,
Projector control means,
The light guide unit is:
A wedge-shaped light guide rod having different areas of the incident surface side end surface and the exit surface side end surface;
A cylindrical body holding member comprising a plurality of locking projections for locking the light guide rod on the inner surface;
A locking plate for fixing the light guide rod to the holding member,
One of the side surfaces of the light guide rod is a tapered surface with respect to the center surface of the light guide rod, and the other side surface of the light guide rod is formed as a surface perpendicular to the incident surface or the exit surface ,
The plurality of locking protrusions on a side surface formed as a tapered surface among the side surfaces of the light guide rod and a surface formed as a surface perpendicular to the incident surface or the exit surface, which is the other side surface of the light guide rod A projector characterized by touching .

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