JP2007256321A - Projector and method for reducing ghost on outside face of projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily reducing ghost on an outside face. <P>SOLUTION: In the method for reducing ghost on the outside face of a projector 100 which irradiates a display element 230 with light from the oblique direction of the display element 230 by means of the mirror 228 of a light-source optical system 220, a light guide device 224 is rotated by an arbitrary angle so that one side of a luminous flux of a rectangular cross-section emitted from the light guide device 224 is almost parallel to one frame of the display element 230 located in a place where this side is irradiated. Also, the position where the luminous flux emitted from the light guide device 224 irradiates the display element 230 is adjusted by the mirror 228 so that the one side of the luminous flux emitted from the light guide device 224 is made close to the image forming part of the display element 230 which corresponds to the one side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a projector and a method for reducing out-of-plane ghost of the projector.

Today, data projectors are widely used as image projection apparatuses for projecting display screen images, video images, and the like of personal computers onto a screen.
This projector uses a high-intensity light source, and a lamp unit in which a concave reflecting mirror as a reflector is attached to a small high-intensity discharge lamp such as a metal highland lamp or an ultra-high pressure mercury lamp is incorporated in the projector as a projector light source device. There are many cases.

  In this lamp unit, a rotating parabolic reflector or a rotating ellipsoidal reflector is often used. A high-intensity discharge lamp is installed near the elliptical focal point of the reflector, and is emitted toward the front and rear. The reflected light is reflected by the rotating parabola or the ellipsoidal reflector, and condensed on the light tunnel or light guide rod.

  The light from the light source device incorporating a high-intensity discharge lamp such as an ultra-high pressure mercury lamp is composed of a red filter, a green filter, and a blue filter, and is red using a color wheel that rotates at a rotation speed of 120 times per second, Green and blue light, and after passing the red, green and blue light through a light guide device such as a light guide rod or light tunnel, the lens is focused on a micromirror display element generally called DMD, A color image is displayed on the screen by the amount of light in an on state reflected by the display element toward the projection port of the projector apparatus.

  In such a projector, it is preferable that the light emitted to the display element has the same shape as the display element as much as possible. However, since the display element is actually very small, light having a shape slightly larger than the shape of the display element is irradiated. In addition, since the display element is irradiated with light from an oblique angle by the mirror, the cross-sectional shape of the light beam irradiated to the display element is a distorted square shape.

  Due to this, the light beam applied to the display element generates unnecessary light that is also applied to the frame that protects the display element, and the light reflected on the frame is used as a projection image. As a result of the projection, there is a problem that another projected image frame is generated outside the normal rectangular projected image frame, which is called an out-of-plane ghost, in the dark state.

In order to solve such problems, for example, in Japanese Patent Application Laid-Open No. 2005-55855 (Patent Document 1), prisms are installed on the incident side and the exit side of the micromirror display element, and normally, the prisms are interposed through the prisms. It is proposed to remove out-of-plane ghosts by emitting light to the projection lens, but by changing the reflection angle of the micromirror display element in the dark state so that light is not transmitted from the prism to the projection lens. ing.
JP 2005-55855 A

  However, in the conventional technology as described above, it is necessary to install a plurality of prisms in the optical path in order to remove the out-of-plane ghost in the dark state, which causes problems such as complicated assembly work and increased cost. It was.

  The present invention has been made in view of the above-described problems of the prior art, and the out-of-plane ghost is reduced by the out-of-plane ghost reduction method that can easily reduce the out-of-plane ghost, and the out-of-plane ghost reduction method. It is an object of the present invention to provide a projector capable of projecting a reduced quality image.

  The out-of-plane ghost reduction method of the present invention includes a light source device (210), a light source side optical system (220), a display element (230) that generates a projection image, and a projection side optical system (250) that projects the projection image. ) And a projector control means (181), the light source side optical system (220) includes a color wheel (221), a light guide device (224) having a light shielding plate (242) and a light guide member, and a light source side A projector (100) comprising a lens group (226) and a mirror (228), and irradiating light onto the display element (230) from an oblique direction of the display element (230) by the mirror (228) of the light source side optical system (220) ), The light emitted from the light guide device (224) is guided so that one side of the light beam having a rectangular cross section is substantially parallel to one frame of the display element (230) located at a position where the one side is irradiated. The optical device (224) is rotated by an arbitrary angle.

  In addition, among the light bundle having a rectangular cross section emitted from the light guide device (224), one side that is parallel to one frame of the display element (230) and an image generation unit of the display element (230) corresponding to the one side ( 233) is adjusted from the light guide device (224) by adjusting the mirror (228) so that the light reflected by the mirror (228) is not irradiated onto a part of the frame of the display element (230) with the one side close to each other. The position at which the emitted light beam irradiates the display element (230) is adjusted. The light guide device (224) is rotated around the optical axis, and the light guide device (224) is housed in the light guide unit (201) and the light guide unit (201) is rotated. There is.

  Further, the projector (100) of the present invention has a substantially rectangular parallelepiped shape and a bottom panel (160), and includes a light source device (210), a light source side optical system (220), and a display element for generating a projection image ( 230), a projection side optical system (250) for projecting a projection image, and a projector control means (181), a light source side optical system (220), a color wheel (221), and a light guide device (224) A light source side lens group (226) and a mirror (228), the light guide member has a rectangular parallelepiped shape with a rectangular cross section, and the light beam having a rectangular cross section emitted from the light guide device (224) So that the bottom of the cross section of the light guide member is not in contact with the bottom panel (160) of the projector (100) so that one side of the light guide member is substantially parallel to one frame of the display element (230) located at the place where the one side is irradiated. They are parallel.

  In addition, one side of the light bundle having a rectangular cross section emitted from the light guide device (224) is parallel to one frame of the display element (230), and the image generation unit of the display element (230) corresponding to the one side The mirror (228) is arranged so as to be close to (233) and not to irradiate light to one frame of the display element (230).

  Then, the light guide device (224) is centered on the optical axis (243) or the axis parallel to the optical axis (243) from the position parallel to the bottom panel (160) of the projector (100), It is rotated and made non-parallel. The light guide device (224) may be housed in the light guide unit (201). Furthermore, the light guide member may use a light tunnel (241) or a light guide rod.

  According to the present invention, it is possible to provide an out-of-plane ghost reduction method capable of easily reducing out-of-plane ghosts, and a projector capable of projecting a high-quality image by reducing out-of-plane ghosts by the out-of-plane ghost reduction method. it can.

  A projector 100 according to the best mode for carrying out the present invention has a substantially rectangular parallelepiped shape and includes a bottom panel 160, a light source device 210, a light source side optical system 220, a display element 230 that generates a projection image, A projection-side optical system 250 for projecting a projection image and a projector control unit 181 are provided. The light source-side optical system 220 includes a color wheel 221, a light guide device 224, a light source-side lens group 226, and a mirror 228. The display element 230 is irradiated with light from the oblique direction of the display element 230 by the mirror 228 of the light source side optical system 220.

  The light guide device 224 is housed in the light guide unit 201. The light source member 210 has one end as an entrance and the other end as an exit, and is disposed near the entrance of the light guide member. Among the light emitted from the light source, there are two light shielding plates 242 that shield unnecessary light and shield the light diffused at the light exit of the light guide member disposed in the vicinity of the light exit. The light shielding plate 242 has an opening 245 having a size and shape approximate to the end shape of the light guide member.

  In addition, the light guide member 224 has a rectangular parallelepiped shape with a rectangular cross section, and one side of the light bundle having a rectangular cross section emitted from the light guide device 224 and the display element 230 positioned at a place where the one side is irradiated. The bottom of the cross-section of the light guide member is not parallel to the bottom panel 160 of the projector 100 so that one frame is substantially parallel.

  Then, the light bundle emitted from the light guide device 224 is brought into the display element 230 so that one side of the light bundle emitted from the light guide device 224 and the image generation unit of the display element 230 corresponding to this one side are brought close to each other. The irradiating position is adjusted by a mirror 228 to reduce out-of-plane ghosts.

  In this way, by arranging the light guide device 224 so that the cross-sectional base of the light guide member is not parallel to the bottom panel 160 of the projector 100, the amount of the light beam irradiated to the frame of the display element 230 can be reduced. Therefore, the out-of-plane ghost can be reduced, and the projector 100 capable of projecting a high-quality image can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The projector according to the present invention has a built-in microcomputer as a projector control means, and has a projection port 123 having a lens cover 121 on the front panel 120 of a case that is a substantially rectangular parallelepiped as shown in FIG. On the top panel 110 of the case are keys and indicators such as a power switch 111, manual image quality adjustment key 113, automatic image quality adjustment key 114, power lamp indicator 112, light source lamp indicator 115, overheat indicator 116, and speaker inside. It has a loudspeaker hole 118 and an open / close lid 119, and a back panel (not shown) has various signal input terminals such as a power connector, a USB terminal connected to a personal computer, a video terminal for inputting image signals, and a mini D-sub terminal. A projector 100 having

  The top panel 119 has sub-keys for performing image quality and fine adjustment of the image and various operation settings of the projector 100, and an air inlet 155 is provided on the left side panel 150 of the case. The panel is provided with an exhaust port and has a cooling fan inside. Further, the left side panel 150 includes a zoom ring 257 that changes the size of the projected image, a focus ring 258 that adjusts the focus of the projected image, and the like.

  In addition, the front panel 170 has a forefoot member 170 that can adjust the amount of protrusion at the front of the bottom panel, and a fixed rear foot member 175 at the rear left and right of the bottom panel. By changing the front height of the projector 100, it is possible to project an image according to the height of the screen.

  In the projector 100, as shown in FIG. 2, a light source device 210 incorporating a discharge lamp 211 such as an ultra-high pressure mercury lamp, and a color wheel 221 and a light guide device 224 as a light source side optical system 220, The illumination side optical system has a plurality of light source side lens groups 226 and one mirror 228.

  Furthermore, the circuit board 180 to which the lamp power supply circuit 187 and the projector control means 181 are attached, the light source side optical system 220 that irradiates the display element 230 with the light emitted from the light source device 210, and the plurality of pixels in the row direction and the column direction. A display element 230 that displays an image by controlling the reflection of incident light arranged in a matrix, and a projection-side optical system 250 that projects light emitted from the display element 230 onto a projection surface such as a screen. The projector 100 incorporates a lens group 253 and a movable lens group 255.

  The circuit board 180 is provided with a projector control means 181 by a microcomputer. The control means 181 controls the operation of each circuit in the projector. When the power switch 111 is turned on, the discharge of the light source device 210 is performed. The lamp 211 is turned on, and the cooling fan 190 is driven at a rated speed according to the output of the discharge lamp 211 and the fan shape and arrangement of the cooling fan 190. The projector 100 is put into a standby state while the air inside the panel 140 is exhausted from the exhaust port 145.

When the temperature of the discharge lamp 211 rises to a predetermined temperature and the light emission is stabilized, an image can be projected by inputting an image signal.
In addition, when the power switch 111 is turned off, the discharge lamp 211 is turned off, and the cooling fan 190 is continuously driven for a predetermined time of about several minutes by a timer to cool the inside of the projector 100 and then perform all operations. Control such as stopping is also performed.

  The display element 230 is a display element 230 having no 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. Yes. In this display element 230, the periphery of the image generation unit in which the micromirrors are arranged and arranged is protected by a frame, and an electric circuit and an electric system for controlling the display element 230 are held in the right frame and the lower frame. For this reason, the areas of the right frame and the lower frame are formed larger than those of the other frames.

  The display element 230 converts light incident from an incident direction inclined in one direction with respect to the front direction into an on-state light beam in the front direction and an off-state light beam in the oblique direction by switching the tilt direction of the plurality of micromirrors. The image is displayed by separately reflecting, and the light incident on the micromirror tilted in one tilt direction is turned into an on-state light beam reflected in the front direction by this micromirror, and tilted in the other tilt direction. The light incident on the micromirror is reflected in an oblique direction by the micromirror 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.

  The light source device 210 includes a discharge lamp 211 inside, and an elliptical spherical reflector whose inner surface is a reflecting surface, and an explosion-proof surface is installed in front of the reflector so as to close the opening in front of the reflector. The discharge lamp 211 is connected by a conductive wire so that power can be supplied from the lamp power supply circuit 187, and the discharge lamp 211 emits light and is reflected by the reflecting surface of the reflector to irradiate light in front of the light source device 210. .

  The light source side optical system 220 that makes the light emitted from the light source device 210 enter the display element 230 includes a color wheel 221, a light guide device 224, a light source side lens group 226 that is a plurality of lenses, and a mirror 228. is doing. The color wheel 221 has a thin disk shape and has a color filter on the plane for sequentially coloring the light emitted from the light source device 210.

  The optical system of the projector 100 according to the present embodiment is housed in an optical system unit 200 as shown in FIG. The optical system unit 200 includes a light guide unit 201, a light source side lens group unit 202, and a projection side optical system unit 203. The color wheel 221 is fixed outside the light guide unit 201 on the incident side so that the color filter of the color wheel 221 is positioned on the optical axis.

  The light guide unit 201 accommodates the light guide device 224. As shown in FIG. 4, a light tunnel 241 as a light guide member, a light shielding plate 242 and a fixture 246 for fixing the light tunnel 241 are provided. Have. The light tunnel 241 has a rectangular parallelepiped outer shape, a cylindrical body having a rectangular parallelepiped cavity inside, and an inner surface as a reflecting surface, and the cavity has a rectangular cross section. One end of the opening is used as the entrance and the other end is used as the exit.

  Further, the light shielding plate 242 has a disk shape and has an opening 245 having a size and shape approximate to the end shape of the light tunnel 241, and the opening 245 is located near the entrance and exit of the light tunnel 241. It is arranged to be located. The light shielding plate 242 shields unnecessary light in the light bundle emitted from the light source device 210 with the light shielding plate 242 disposed near the entrance of the light tunnel 241 and diffuses it at the exit of the light tunnel 241. The light beam bundle is shielded by the light shielding plate 242 disposed in the vicinity of the exit of the light tunnel 241, thereby preventing unnecessary light from irradiating the display element 230. Further, the light shielding plate 242 is made of metal and has a black paint having heat resistance. In this way, it is heat-resistant by being formed of a metal, and light is prevented from being reflected by applying an anti-reflection coating of black or the like.

  The light source side lens group unit 202 houses a light source side lens group 226 and a mirror 228. The light source side lens group 226 transmits the light emitted from the light guide device 224 and irradiates the mirror 228, and the mirror 228 reflects the light transmitted through the light source side lens group 226 toward the display element 230. Thus, light is projected onto the display element 230 from a direction inclined in one direction with respect to the front direction, and the display element 230 is positioned so that the light beam transmitted through the light source side lens group 226 is irradiated. It is installed with the angle adjusted.

  The projection-side optical system unit 203 houses a projection-side optical system 250. The projection-side optical system 250 is engaged with a fixed barrel containing a fixed lens group 253, and this fixed barrel is rotated. A movable lens barrel having a movable lens group 255 that can be moved back and forth in the axial direction by an operation is provided, and a zoom lens is formed by a combination of a plurality of lenses incorporated in these lens barrels. The projection-side optical system 250 has a function of projecting light emitted from the micromirror display element 230 and removing stray light that is unnecessary light.

  As described above, the projector 100 emits light from the light source device 210 in one direction, and rotates the color wheel 221 of the light source side optical system 220 at a high speed, thereby entering the light source side optical system 220 from the light source device 210. The colored light is sequentially colored by the color wheel 221, and the intensity distribution is made uniform by the light tunnel 240 of the light guide device 224, and directed to the display element 230 by the light source side lens group 226 and the mirror 228 as the light source side optical system 220. Project.

  When the light from the light source device 210 is stabilized after a predetermined time has elapsed since the power was turned on, the monochrome image of each color is displayed on the display element 230 in synchronization with the projection period of each colored light transmitted through the color wheel. By sequentially writing the data, the single color image of each color is sequentially formed on the display element 230 by the on-state light beam reflected in the front direction of the display element 230, and the single color image light of each color sequentially emitted from the display element 230 is projected on the projection side. The image is magnified by the lens groups 253 and 255 of the optical system 250 and projected onto the projection surface, and a full-color image in which the single-color images of the three colors are superimposed is displayed on the projection surface.

  In such a projector 100, as shown in FIG. 5, in the dark state, a faint shade called out-of-plane ghosts A and B occurs outside the frame of the projected image. The reason why the out-of-plane ghost is generated will be described with reference to FIG.

  First, as shown in FIG. 6A, the light emitted from the light source device 210 is incident from the opening 245 of the light shielding plate 242 located at the incident port of the light guide device 224 and enters from the exit port of the light guide device 224. Eject. The shape of the light beam at this time is a substantially rectangular shape.

  Next, as shown in FIG. 6 (b), the light beam emitted from the light guide device 224 is inverted vertically and horizontally by the light source side lens group 226, and further inverted horizontally by the mirror 228 to form the display element 230. Irradiated. That is, the light bundle emitted from the light guide device 224 in FIG. 6A becomes a light bundle whose top and bottom are inverted in FIG. 6B. Further, since the light beam is obliquely applied from the mirror 228 to the display element 230, the light beam has a square shape with a distorted cross section.

  Then, as shown in FIGS. 6B and 7, when the display element 230 is irradiated with light, the rectangular shape is distorted not only in the image generation unit 233 but also in the right frame 232 and the lower frame 231 formed with a large area. A part of the light is irradiated.

  In addition, as shown in FIG. 6C, the light reflected from the display element 230 is projected as a projected image by inverting the top, bottom, left and right. That is, the side ab and the side dc, which are the frame of the light bundle in FIG. Here, in FIG. 6B and FIG. 6C, the left and right sides are not inverted because the actual image is inverted, but FIG. 6B is the projector 100 from the front of the display element 230. FIG. 6C is a view of the front screen direction from the projector side, so that the viewpoint direction is reverse and the left and right are reversed. .

  For this reason, light that does not form an image reflected by the outside of the lower frame 231 and the right frame 232 of the display element 230 in FIG. 7 cannot be completely removed in the subsequent projection-side optical system 250, and a part of the light is projected as it is. Since it passes through the system 250 and is displayed as a projected image, as shown in FIG. 5 described above, a faint shade called out-of-plane ghost occurs outside the projection frame of the projected image in the dark state. .

  Therefore, in this embodiment, one side of the light bundle having a substantially rectangular cross section emitted from the light guide device 224 and one frame of the display element 230 located at a place where the one side is irradiated are substantially parallel to each other. In addition, the light guide device 224 is disposed obliquely in a state where the light guide device 224 is rotated at an arbitrary angle, and one side of the light bundle emitted from the light guide device 224 is brought close to the image generation unit of the display element 230 corresponding to the one side. As described above, the position where the light beam emitted from the light guide device 224 irradiates the display element 230 is adjusted by the mirror 228 to reduce the out-of-plane ghost. In other words, the light guide member is arranged so that the cross-sectional base of the light guide member is not parallel to the bottom panel of the projector.

  For example, in order to reduce the out-of-plane ghost A in FIG. 5 described above, as shown in FIGS. 8 and 9, the light tunnel 241 of the light guide device 224 is rotated clockwise about the optical axis 243 to fix the fixture 246. As shown in FIG. 10, the right side bc of the light beam applied to the display element 230 and the right frame 232 of the display element 230 are made substantially parallel to each other. Then, as shown in FIG. 11, adjustment is performed by the mirror 228 so that the right frame of the light bundle emitted from the light guide device 224 is close to the image generation unit 233 of the display element 230.

Thus, by fixing the light guide device 224 by rotating it at an arbitrary angle around the optical axis 243 and adjusting it with a mirror, the projected image can reduce out-of-plane ghost A as shown in FIG. It is possible to provide a high-quality projection image.
In addition, adjusting the light applied to the display element by the mirror is always performed at the time of manufacture of the projector, and it is possible to reduce out-of-plane ghosts in the process of manufacturing the projector as in the past.

  Further, in order to reduce the out-of-plane ghost B in FIG. 5, the light tunnel 241 of the light guide device 224 is fixed by rotating the light tunnel 241 left by an arbitrary angle around the optical axis 243, and the light flux irradiated to the display element 230 is reduced. The lower side ab and the lower frame 231 of the display element 230 are made substantially parallel. Then, the out-of-plane ghost can be reduced by adjusting the mirror 228 so that the light emitted from the light guide device 224 is positioned in the vicinity of the lower frame 231 of the image generation unit 233 of the display element 230.

  According to the present embodiment, the light guide device 224 is rotated around the optical axis so that the bottom of the cross section of the light guide member is not parallel to the bottom panel of the projector, and the irradiation position on the display element is adjusted by the mirror By doing so, out-of-plane ghosts can be reduced, and thus a high-quality projection image can be provided.

  Although the light guide device 224 has been rotated so far, it is also possible to rotate the light guide device 224 by rotating the light guide unit 201 together, and the rotation of the light guide device 224 is centered on the optical axis. The light guide device or the light guide unit is arranged with the bottom of the cross section of the light guide device 224 tilted by the rotation as well as the axis other than the optical axis parallel to the optical axis. And the same effect can be acquired also by adjusting the irradiation position with respect to the display element of the light beam inject | emitted from the light guide device with a mirror.

Moreover, although the light tunnel was used as the light guide member, it is naturally possible to use a light guide rod.
Further, the present invention is not limited to the above embodiments, and can be freely changed and improved without departing from the gist of the invention.

1 is a perspective view showing an external appearance of a projector according to the present invention. FIG. 2 is a plan view showing the inside of the projector according to the invention. 1 is a schematic diagram of an optical system unit in a projector according to the present invention. Schematic of the light guide unit in the projector according to the present invention. The schematic diagram explaining the out-of-plane ghost in a projection image. Schematic explaining the irradiation state of the light by the light beam in the projector which concerns on this invention. The figure which shows the state of the light beam irradiated to a display element and a display element. Explanatory drawing of the light guide unit in the projector which concerns on this invention. Schematic of the light guide member in the projector which concerns on this invention. Explanatory drawing of the relationship between the micromirror display element and light bundle in the projector which concerns on this invention. Explanatory drawing of adjustment of the light beam by the reflective mirror in the projector which concerns on this invention. The front view of the projection image in the projector which concerns on this invention.

Explanation of symbols

100 Projector 110 Top panel
111 Power switch 112 Power lamp indicator
113 Manual image quality adjustment key 114 Automatic image quality adjustment key
115 Light source lamp indicator 116 Heating indicator
118 Loudspeaker 119 Open / close lid
120 Front panel 121 Lens cover
123 Projection port 130 Rear panel
140 Right side panel 145 Exhaust port
150 Left side panel 155 Air intake
160 Bottom panel 170 Forefoot member
175 Rear foot member 180 Circuit board
181 Projector control means 187 Lamp power circuit
190 Cooling fan 200 Optical unit
201 Light guide unit 202 Light source side lens unit
203 Projection-side optical system unit 210 Light source device
211 Discharge lamp 220 Light source side optical system
221 color wheel
224 Light guide device 226 Light source side lens group
228 Mirror 230 Micro mirror display element
231 Bottom frame 232 Right frame
233 Image generator
241 Light tunnel 242 Shading plate
243 optical axis
245 Opening 246 Fixing member
250 Projection-side optics 253 Fixed lens group
255 Movable lens group 257 Zoom ring
258 Focus ring

Claims (9)

A light source device;
A light source side optical system;
A display element for generating a projection image;
A projection-side optical system that projects a projection image;
Projector control means,
The light source side optical system includes a color wheel, a light guide device having a light shielding plate and a light guide member, a light source side lens group, and a mirror,
In the projector that irradiates light to the display element from the oblique direction of the display element by the mirror of the light source side optical system,
Rotating the light guide device so that one side of a light beam having a rectangular cross section emitted from the light guide device and one frame of the display element located at a place where the one side is irradiated are substantially parallel to each other. An out-of-plane ghost reduction method characterized by   Displayed by bringing one side parallel to one frame of the display element, and one side of the image generation unit of the display element corresponding to the one side, out of a bundle of rays having a rectangular cross section emitted from the light guide device 2. The position of irradiating the display element with a light beam emitted from the light guide device is adjusted by adjusting the mirror so as not to irradiate light to a part of the element frame. To reduce out-of-plane ghosts.   3. The out-of-plane ghost reduction method according to claim 1, wherein the light guide device is rotated about an optical axis.   The out-of-plane ghost according to any one of claims 1 to 3, wherein the light guide device is housed in a light guide unit, and the light guide unit is rotated by rotating the light guide unit. Reduction method. It has a substantially rectangular parallelepiped shape and a bottom panel,
A light source device inside,
A light source side optical system;
A display element for generating a projection image;
A projection-side optical system that projects a projection image;
Projector control means,
The light source side optical system includes a color wheel, a light guide device having a light shielding plate and a light guide member, a light source side lens group, and a mirror,
The light guide member has a rectangular parallelepiped shape with a rectangular cross section,
The cross-sectional base of the light guide member is such that one side of the light bundle having a rectangular cross section emitted from the light guide device and one frame of the display element located at a place where the one side is irradiated are substantially parallel. Is a non-parallel to the bottom panel of the projector.   Of the light bundle having a rectangular cross section emitted from the light guide device, one side parallel to one frame of the display element is brought close to one side of the image generation unit of the display element corresponding to the one side, and the display The projector according to claim 5, wherein the mirror is arranged so that light is not irradiated to one frame of the element.   In the light guide device, the bottom of the cross-section of the light guide member is rotated from the parallel position with the bottom panel of the projector around an optical axis or an axis parallel to the optical axis to be non-parallel. The projector according to claim 5 or 6.   The projector according to claim 5, wherein the light guide device is housed in a light guide unit.   The projector according to claim 5, wherein the light guide member is a light tunnel or a light guide rod.

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