JP2011253079A - Lighting system for projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the production cost of a projector and miniaturize the projector.SOLUTION: LEDs are sequentially lit synchronized with the rotation of a polygon mirror. When the polygon mirror is rotated to an R light reflection position, R light is reflected at an R light reflecting surface and efficiently enters a rod integrator. When the polygon mirror is rotated to a G light reflection position, G light is reflected at a G light reflecting surface and efficiently enters the rod integrator. When the polygon mirror is rotated to a B light reflection position, B light is reflected at a B light reflecting surface and efficiently enters the rod integrator.

Description

  The present invention relates to an illumination device for a projector that uses a plurality of light emitting elements having different emission colors.

  Various projectors that display an image on an image display element such as a liquid crystal panel or DMD (digital micromirror device) and project the image on a screen by illumination light from a light source have been commercialized. In these projectors, in addition to a xenon lamp and a metal halide lamp, a solid light emitting element such as a light emitting diode (LED) or a laser diode (LD) has recently been used as a light source for illumination.

  In particular, LEDs can individually obtain the red (R), green (G), and blue (B) emission colors necessary for color image reproduction, so that each color image is displayed on the image display element in time series. In synchronism with this, it is suitable for a light source of a field sequential projector that sequentially irradiates the image display element with illumination light of each color from the LED. A plane sequential projector requires only one image display element. If a solid-state light emitting element such as an LED is used, a color separation optical system that separates white illumination light into R, G, and B component color lights is unnecessary. Therefore, it is easy to make it lightweight and compact.

  On the other hand, in a projector, an optical integrator is usually used so that illumination light from a light source can be irradiated onto the display surface of the image display element with a uniform intensity distribution. Light integrators that use fly-eye lenses or prism integrators or prismatic rod integrators are known, but they eliminate unevenness in the intensity distribution of the amount of light that incident illumination light has. On the display surface of the display element, there is an effect of making the intensity distribution of the illumination light uniform.

  In the surface sequential projector known from Patent Document 1, in order to make R, G, B illumination light obtained by sequentially driving three types of LEDs incident on the rod integrator without loss, these LEDs are connected to the rod integrator. Are sequentially moved on the optical axis.

JP 2003-346503 A

  In the projector described in Patent Document 1, since three types of LEDs can always make illumination light of each color incident on the rod integrator under certain conditions, there is no loss of light amount, and uniform illumination light is emitted on the display surface of the image display element. Although there is an advantage that it can be obtained, the LED must be rotated or moved back and forth at high speed, and its drive mechanism tends to be complicated. Further, it is necessary to devise the wiring and contact structure for supplying the driving current to the LED, which may increase the manufacturing cost or hinder the compactness.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a projector illumination device capable of reducing the manufacturing cost and reducing the size.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a plurality of light emitting elements having different emission colors are arranged in parallel, and the illumination light emitted from the light emitting elements is brought into a single light so that the illumination optical axes of the light emitting elements approach each other. A projector that sequentially enters the integrator and irradiates the image display elements driven in synchronization with the light emission timings of the plurality of light emitting elements to generate image light in a surface sequential manner. And at least three reflecting surfaces which are provided so as to be rotatable about an axis perpendicular to a surface including each of the illumination optical axes of the plurality of light emitting elements and reflect the illumination light from the light emitting elements. Are arranged around the axis, and at least one of the angles formed by the adjacent reflecting surfaces is different from the other angles, and the rotating polyhedral mirror is rotated at a constant speed. Rotates in synchronized sequentially emit light a plurality of light emitting elements, it is the illumination light are sequentially emitted from said plurality of light emitting elements that a synchronization control unit to be incident on the optical integrator.

  According to a second aspect of the present invention, the plurality of light emitting elements include a first light emitting element that emits first component color light, a second light emitting element that emits second component color light, and a third component color light. A third light-emitting element that emits light, the reflective surface is composed of six surfaces, a first reflective surface that reflects the first component color light, and a second reflective surface that reflects the second component color light; A third reflecting surface that reflects the third component color light is arranged around the axis in order, and the first to third reflecting surfaces are provided two by two, and the image display element includes the first to first Driven so as to display an image corresponding to each component color light in synchronization with the light emission timing of the three light emitting elements, the synchronization control means is the first to third reflecting surfaces of the rotating polyhedral mirror to rotate the first The first to third light emitting elements are caused to emit light at a timing when the first to third component color lights are reflected. It is intended.

According to a third aspect of the present invention, a plurality of light emitting elements having different emission colors are arranged in parallel, and a single illumination light is emitted from the light emitting elements so that the respective illumination optical axes are parallel to each other in the same plane. Sequentially incident on an optical integrator, and irradiates each illumination light incident on the optical integrator onto an image display element driven in synchronization with the light emission timings of the plurality of light emitting elements to generate image light in a surface sequential manner. In projector lighting devices,
Synchronizing with the rotation of the rotating polyhedral mirror in which at least three reflecting surfaces that reflect the illumination light from the light emitting element are arranged around the axis of rotation, and the rotating polyhedral mirror rotating at a constant speed Synchronization control means for causing the plurality of light emitting elements to emit light sequentially and causing illumination light sequentially emitted from the plurality of light emitting elements to enter the optical integrator, wherein the axis includes each of the illumination optical axes Parallel to the surface and orthogonal to each of the illumination optical axes, and the reflection surface has at least three or more inclined surfaces arranged along the axial direction of the axis, and has an angle formed by the adjacent inclined surfaces. At least one is different from the other angles.

  According to a fourth aspect of the present invention, the plurality of light emitting elements include a first light emitting element that emits first component color light, a second light emitting element that emits second component color light, and a third component color light. A first light-emitting surface that reflects the first component color light, and a second light-emitting surface that reflects the second component color light. The third inclined surface that reflects the third component color light is aligned along the axial direction, and the image display element converts each of the component color lights in synchronization with the light emission timing of the first to third light emitting elements. The first control unit is driven to display a corresponding image, and the synchronization control unit is configured such that the first to third component color lights are reflected by the first to third reflection surfaces of the rotating polyhedral mirror. -The 3rd light emitting element is made to light-emit.

  According to a fifth aspect of the present invention, the first to third light emitting elements are light emitting diodes or laser diodes that emit red light, blue light, and green light as component color lights, respectively.

  According to the present invention, a driving mechanism for a light emitting element is not required, and complicated wiring and contact structures for supplying a driving current to the light emitting element are not required, thereby reducing manufacturing cost and downsizing. Can do.

  Further, when the plurality of light emitting elements are constituted by the first to third light emitting elements, it is possible to generate image light by three component color lights while simplifying the drive control of the rotating polyhedral mirror.

  Furthermore, when the first to third light emitting elements are light emitting diodes or laser diodes, the color separation optical system is not necessary, and the lighting device can be downsized.

It is an external appearance perspective view of a projector. It is explanatory drawing which shows the schematic structure of the whole projector, and the state which the polygon mirror rotated to the G light reflection position. It is explanatory drawing which shows the state which the polygon mirror rotated to the B light reflection position. It is explanatory drawing which shows the state which the polygon mirror rotated to the R light reflection position. It is a timing chart which shows each timing when irradiation of each color light, rotation of a polygon mirror, and image display on an LCD panel are synchronized. It is an external appearance perspective view of the polygon mirror which concerns on 2nd Embodiment. It is a side view of the polygon mirror which concerns on 2nd Embodiment. It is explanatory drawing which shows the schematic structure of the whole projector which concerns on 2nd Embodiment. It is a timing chart which shows each timing when irradiation of each color light and polygon mirror rotation and image display on an LCD panel are synchronized in the second embodiment.

  First, the first embodiment will be described.

  As shown in FIG. 1, the portable projector 10 includes a housing 11 having a substantially rectangular parallelepiped shape. The projection lens 12 is exposed to the outside from the front surface of the housing 11, and image light is projected from the projection lens 12 onto the screen. A power switch 13 is provided on the side surface of the housing 11. The power supply of the projector 10 is switched on / off by a slide operation of the power switch 13.

  As shown in FIGS. 2 to 4, the projector 10 includes an illumination optical system 20, an LCD panel 21, and a projection lens 12. The projector 10 illuminates the LCD panel 21 with the illumination optical system 20 and projects the image light transmitted through the LCD panel 21 onto the screen 15 by the projection lens 12.

  The illumination optical system 20 includes LEDs 22, 23, 24, a prism 25, a condenser lens 26, a rod integrator 27, and a relay lens 28. The LED 22 emits R (red) light, the LED 23 emits G (green) light, and the LED 24 emits B (blue) light.

  The LEDs 22 to 24 are arranged in a line. The R light from the LED 22, the G light from the LED 23, and the B light from the LED 24 enter the prism 25 that changes the direction of the optical axis. The prism 25 has an R, G, B light incident surface that is flat. The G light exit surface is parallel to the R, G, and B light entrance surfaces, and the R light and B light exit surfaces are inclined downward from the center toward the end. When the R, G, B light passes through the prism 25, the directions thereof change so that the optical axis L1 of the R light and the optical axis L3 of the B light approach the optical axis L2. The R, G, B light that has passed through the prism 25 is guided to a polygon mirror 29 formed in a hexagonal prism shape.

  The polygon mirror 29 is rotatably supported on an axis 29a perpendicular to the plane including the optical axes L1 to L3, and rotates counterclockwise in FIG. A total of six R light reflecting surfaces 29b, G light reflecting surfaces 29c, and B light reflecting surfaces 29d are provided around the shaft 29a. These reflection surfaces 29b to 29d are arranged around the axis 29a in the order of R light reflection surface 29b → B light reflection surface 29d → G light reflection surface 29c, and adjacent reflection surfaces are connected. And the angle of the apex angle formed by connecting the reflecting surface 29b and the reflecting surface 29d, the angle of the apex angle formed by connecting the reflecting surface 29b and the reflecting surface 29c, the reflecting surface 29c and the reflecting surface 29d, Are different from each other. The LEDs 22 to 24 emit light sequentially in accordance with the rotation of the polygon mirror 29. The R light is reflected by the R light reflecting surface 29b, the G light is reflected by the G light reflecting surface 29c, and the B light is reflected by the B light reflecting surface 29d. Each reflected color light is guided to the rod integrator 27. The directions of the optical axes L1 to L3 of the reflected illumination light change within a certain range due to the rotation of the polygon mirror 29. Even if the directions of the optical axes L1 to L3 change, each color light is efficiently transmitted to the rod integrator 27. The angles of the reflecting surfaces 29b to 29d are determined so as to be incident. The condensing lens 26, the rod integrator 27, and the relay lens 28 are arranged on the same straight line, and the optical axes L1 to L3 after reflection are on this straight line when each color light is reflected at the centers of the reflecting surfaces 29b to 29d. Pass through. Hereinafter, the R light reflecting surface 29b represents the rotational position of the polygon mirror 29 that reflects each color light, the R light reflecting position (the position shown in FIG. 4), and the G light reflecting surface 29c represents the rotational position of the polygon mirror 29 that reflects each color light. The G light reflection position (position shown in FIG. 2) and the rotational position of the polygon mirror 29 where the B light reflection surface 29d reflects each color light are referred to as B light reflection position (position shown in FIG. 3). In the drawing, for convenience, “R” is provided near the R light reflecting surface 29b, “G” is provided near the G light reflecting surface 29c, and “B” is provided near the B light reflecting surface 29d.

  The CPU 30 controls the overall operation of the projector 10 by reading the driving program for the projector 10 from the memory 31. The CPU 30 performs lighting control of the LEDs 22 to 24 and sequentially switches the LEDs 22 to 24 to emit light in a predetermined order (LED22 → LED23 → LED24 → LED22 →...).

  The shaft 29 a of the polygon mirror 29 is rotated at a constant speed by the driving of the stepping motor 32. The drive control of the stepping motor 32 is performed by the CPU 30. The CPU 30 sequentially switches the LEDs 22 to 24 to emit light in synchronization with the rotation of the polygon mirror 29.

  The stepping motor 32 rotates at a rotation angle corresponding to the number of drive pulses supplied from the CPU 30. The polygon mirror 29 is provided with a reference position mark 29e on one of the side surfaces orthogonal to the in-plane direction of each of the reflection surfaces 29b to 29d. The mark detection sensor 33 detects the passage of the reference position mark 29e, and inputs this detection signal to the CPU 30 as a reset signal indicating the reference position of the polygon mirror 29.

  The CPU 30 includes a pulse counter that counts the number of drive pulses supplied to the stepping motor 32. The CPU 30 clears the count value of the pulse counter when a reset signal is input from the mark detection sensor 33. Therefore, the number of drive pulses corresponding to the rotation angle within one rotation of the polygon mirror 29 is stored in the pulse counter while being sequentially updated.

  The memory 31 stores a rotational position table. In the rotation position table, the number of drive pulses corresponding to the rotation angle from the reference position of the polygon mirror 29 is associated with the rotation positions of the reflecting surfaces 29b to 29d. The CPU 30 monitors the count value of the pulse counter while referring to the rotation position table, thereby determining whether the rotation position of the polygon mirror 29 is at the R light reflection position, the G light reflection position, or the B light reflection position. Can be identified.

  The condensing lens 26 condenses the reflected light from the reflecting surfaces 29 b to 29 d of the polygon mirror 29. The reflected light collected by the condenser lens 26 enters the rod integrator 27. By using the condensing lens 26, illumination light can be efficiently incident on the rod integrator 27 even if the position of the optical axis after reflection changes as the polygon mirror 29 rotates.

  The rod integrator 27 makes the light intensity distribution of the light receiving surface of the LCD uniform from the center to the periphery by making the density of the light beams of the respective colors from the LEDs 22 to 24 uniform. The light beam that has entered the rod integrator 27 is repeatedly superimposed and superimposed inside, and the density of the light beam emitted from it is made uniform.

  The relay lens 28 includes two lenses 34 and 35, and images light emitted from the emission surface 27 b of the rod integrator 27 on the light receiving surface of the LCD panel 21. The image light generated through the LCD panel 21 enters the projection lens 12. The image light emitted from the projection lens 12 is projected onto the screen 15. When the R light is irradiated, the CPU 30 causes the LCD panel 21 to display an image to be displayed in red. Similarly, the CPU 30 displays an image displayed in green on the LCD panel 21 when the G light is irradiated, and displays a component displayed in blue on the LCD panel 21 when the B light is irradiated. Thus, image light corresponding to each color can be obtained, and a color image can be obtained by switching each color and the image corresponding to each color at high speed.

  Next, a processing flow when synchronizing the switching of the LEDs 22 to 24 and the rotation of the polygon mirror 29 will be described.

  As shown in FIG. 5, when the power switch 13 is turned on, the polygon mirror 29 starts to rotate. When the polygon mirror 29 is rotated to the R light reflecting position, the LED 22 is turned on and the R light is irradiated. When the polygon mirror 29 rotates to the R light reflecting position, the R light is reflected by the R light reflecting surface 29 b and enters the rod integrator 27. During the irradiation of the R light, an image corresponding to the R light is displayed on the LCD panel 21. Before the polygon mirror 29 finishes passing through the R light reflection position, the LED 22 is turned off and the image display on the LCD panel 21 is finished. When the polygon mirror 29 is rotated at the R light reflection position, the direction of the optical axis L1 of the reflected illumination light is a polygon mirror so that the optical axis L1 of the R light efficiently enters the incident surface 27a of the rod integrator 27. It changes with 29 rotations.

  After the LED 22 is turned off, when the polygon mirror 29 is rotated to the G light reflection position, the LED 23 is turned on and the G light is irradiated. At this time, the G light is reflected by the G light reflecting surface 29 c and enters the rod integrator 27. During the irradiation of the G light, an image corresponding to the G light is displayed on the LCD panel 21. Before the polygon mirror 29 finishes passing through the G light reflection position, the LED 23 is turned off and the image display on the LCD panel 21 is ended. When the polygon mirror 29 is rotating at the G light reflection position, the direction of the optical axis L2 of the reflected illumination light is the polygon mirror so that the optical axis L2 of the G light is efficiently incident on the incident surface 27a of the rod integrator 27. It changes with 29 rotations.

  After the LED 23 is turned off, when the polygon mirror 29 rotates to the B light reflection position, the LED 24 is turned on and the B light is irradiated. At this time, the B light is reflected by the B light reflecting surface 29 d and enters the rod integrator 27. During the irradiation of the B light, an image corresponding to the B light is displayed on the LCD panel 21. Before the polygon mirror 29 finishes passing the B light reflection position, the LED 24 is turned off and the image display on the LCD panel 21 is finished. When the polygon mirror 29 is rotated at the B light reflection position, the direction of the optical axis L3 of the reflected illumination light is a polygon mirror so that the optical axis L3 of the B light efficiently enters the incident surface 27a of the rod integrator 27. It changes with 29 rotations.

  After the LED 24 is turned off, the LED 22 is turned on and irradiated with R light, and the above processing is repeated. As described above, the LEDs 22 to 24 are turned on in synchronization with the rotation of the polygon mirror 29, so that light of each color can be uniformly incident on the rod integrator 27.

  The light beams of the respective colors whose densities are made uniform by the rod integrator 27 pass through the relay lens 28 and form an image on the light receiving surface of the LCD panel 21. The image light transmitted through the LCD panel 21 enters the projection lens 12, and the image light emitted from the projection lens 12 is projected onto the screen 15.

  Next, a second embodiment will be described. The same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. The second embodiment differs from the first embodiment in the arrangement direction of the polygon mirror and the LED.

  As shown in FIGS. 6 to 8, the LEDs 22 to 24 are arranged in a line, and the optical axes L1 to L3 of the illumination light from the LEDs 22 to 24 are parallel to each other in the same plane. The polygon mirror 40 is rotatably supported on an axis 40a that is parallel to a plane including each of the LEDs 22 to 24 and orthogonal to the optical axes L1 to L3. The polygon mirror 40 is formed in a substantially truncated pyramid shape having a regular hexagonal cross section. Around the shaft 40a, there are provided six reflecting surfaces 40b connected to each other. The R, G, B light is reflected by the reflecting surface 40 b and guided to the rod integrator 27. The reflecting surface 40b includes an R light reflecting surface 40c that reflects R light, a G light reflecting surface 40d, and a B light reflecting surface 40e. The reflecting surfaces 40c to 40e are arranged in the axial direction of the shaft 40a and are connected to each other. Each reflective surface 40c-40e inclines at a fixed angle so that the angle which adjacent reflective surfaces make may mutually differ. The LEDs 22 to 24 emit light sequentially in accordance with the rotation of the polygon mirror 40. Then, the R light is reflected by the reflecting surface 40c, the G light is reflected by the reflecting surface 40d, and the B light is reflected by the reflecting surface 40e. Each reflected color light is guided to the rod integrator 27. The directions of the optical axes L1 to L3 of the reflected illumination light change within a certain range due to the rotation of the polygon mirror 40. However, even if the directions of the optical axes L1 to L3 change, each color light is efficiently transmitted to the rod integrator 27. The angles of the reflecting surfaces 40c to 40e are determined so as to be incident. In the drawing, “R” is applied to the R light reflecting surface 40c, “G” is applied to the G light reflecting surface 40d, and “B” is applied to the B light reflecting surface 40e for convenience.

  As in the first embodiment, the shaft 40 a of the polygon mirror 40 rotates at a constant speed by driving the stepping motor 32. The drive control of the stepping motor 32 is performed by the CPU 30. The CPU 30 sequentially switches the LEDs 22 to 24 to emit light in synchronization with the rotation of the polygon mirror 40. When the reference position mark 40 f of the polygon mirror 40 is detected by the mark detection sensor 33, a reset signal is input to the CPU 30. The CPU 30 monitors the count value of the pulse counter while referring to the rotational position table of the memory 31 to identify the rotational position of the polygon mirror 29, and whether or not the reflecting surface 40b of the polygon mirror 40 has been switched (LEDs 22 to 24). Whether or not the reflection surface 40b irradiated with the illumination light from the light becomes a reflection surface 40b that has been rotated subsequently).

  Next, the flow of processing when synchronizing the switching of the LEDs 22 to 24 and the rotation of the polygon mirror 40 will be described.

  As shown in FIG. 9, when the power switch 13 is turned on, the polygon mirror 40 starts to rotate. When the reflecting surface 40b of the polygon mirror 40 is switched and rotated by a predetermined angle, the LED 22 is turned on and R light is emitted. The R light is reflected by the R light reflecting surface 40 c and enters the rod integrator 27. During the irradiation of the R light, an image corresponding to the R light is displayed on the LCD panel 21. Before the reflecting surface 40b of the polygon mirror 40 is switched, the LED 22 is turned off and the image display on the LCD panel 21 is finished. When the R light is reflected by the R light reflecting surface 40c, the direction of the optical axis L1 of the reflected illumination light is such that the optical axis L1 of the R light is efficiently incident on the incident surface 27a of the rod integrator 27. It changes with the rotation.

  Thereafter, when the reflecting surface 40b of the polygon mirror 40 is switched and rotated by a predetermined angle, the LED 23 is turned on and G light is irradiated. The G light is reflected by the G light reflecting surface 40 d and enters the rod integrator 27. During the irradiation of the G light, an image corresponding to the G light is displayed on the LCD panel 21. Before the reflecting surface 40b of the polygon mirror 40 is switched, the LED 23 is turned off and the image display on the LCD panel 21 is finished. When the G light is reflected by the G light reflecting surface 40d, the direction of the optical axis L2 of the reflected illumination light is such that the optical axis L2 of the G light efficiently enters the incident surface 27a of the rod integrator 27. It changes with the rotation.

  Thereafter, when the reflecting surface 40b of the polygon mirror 40 is switched and rotated by a predetermined angle, the LED 24 is turned on and the B light is irradiated. The B light is reflected by the B light reflecting surface 40 e and enters the rod integrator 27. During the irradiation of the B light, an image corresponding to the B light is displayed on the LCD panel 21. Before the B light reflecting surface 40e of the polygon mirror 40 is switched, the LED 24 is turned off and the image display on the LCD panel 21 is finished. When the B light is reflected by the B light reflecting surface 40e, the direction of the optical axis L3 of the reflected illumination light is set to the polygon mirror 40 so that the optical axis L3 of the B light efficiently enters the incident surface 27a of the rod integrator 27. It changes with the rotation.

  After the LED 24 is turned off, when the reflecting surface 40b of the polygon mirror 40 is switched and rotated by a predetermined angle, the LED 22 is turned on and irradiated with R light, and the above processing is repeated. As described above, the LEDs 22 to 24 are lit in synchronization with the rotation of the polygon mirror 29, so that the light of each color can be uniformly incident on the rod integrator 27. Further, unlike the first embodiment, since each reflecting surface 40b is the same, the processing of the polygon mirror 40 is simplified, and the manufacturing cost of the projector 10 can be reduced.

  The light beams of the respective colors whose densities are made uniform by the rod integrator 27 pass through the relay lens 28 and form an image on the light receiving surface of the LCD panel 21. The image light transmitted through the LCD panel 21 enters the projection lens 12, and the image light emitted from the projection lens 12 is projected onto the screen 15.

  In each of the above embodiments, an LED is used as the light emitting element, but another light emitting element such as a laser diode may be used.

  In each of the above embodiments, the reflecting surfaces are connected to each other. However, the reflecting surfaces may not be connected to each other as long as they are arranged around the axis. In addition, the inclined surfaces may not be continuous with each other as long as the inclined surfaces are arranged along the axial direction of the rotating polygon mirror.

  In the above embodiments, the LEDs 22 to 24 are arranged side by side. However, the number of light emitting elements to be arranged side by side and the color of each LED may be an appropriate number and an appropriate color. For example, it is possible to arrange light emitting elements having three emission colors of R, G, and B in parallel.

  In each of the above embodiments, the rod integrator is taken as an example of the optical integrator, but a fly-eye lens may be used.

  In each of the above embodiments, the reflecting surfaces are arranged around the axis, but the reflecting surfaces do not have to be linked, for example, a surface other than the reflecting surface is formed between the reflecting surfaces. If the surface is arranged around the axis, the shape of the polygon mirror may be appropriately set.

  In the above embodiments, the portable projector 10 has been described as an example. However, the present invention may be applied to other types of projectors such as a stationary projector.

10 Projector 22, 23, 24 LED
29 Polygon mirror 29a Axis 29b R light reflecting surface 29c G light reflecting surface 29d B light reflecting surface 30 CPU
32 Stepping motor 40 Polygon mirror 40a Axis 40c R light reflecting surface 40d G light reflecting surface 40e B light reflecting surface 40b Reflecting surface

Claims (5)

A plurality of light emitting elements having different emission colors are arranged in parallel, and the illumination light emitted from the light emitting elements is sequentially incident on a single light integrator so that the illumination optical axes of the light emitting elements approach each other. In an illumination device for a projector that generates image light in a surface sequential manner by irradiating an image display element that is driven in synchronization with light emission timings of the plurality of light emitting elements,
At least three or more reflective surfaces that are provided to be rotatable about an axis perpendicular to a plane including each of the illumination optical axes of the plurality of light emitting elements and reflect illumination light from the light emitting elements are provided around the axis. A rotating polyhedral mirror that is disposed and at least one of the angles formed by the adjacent reflecting surfaces is different from the other angles;
Synchronization control means for causing the plurality of light emitting elements to sequentially emit light in synchronization with rotation of the rotating polyhedral mirror rotating at a constant speed, and causing illumination light sequentially emitted from the plurality of light emitting elements to enter the light integrator; A projector illumination device comprising: The plurality of light emitting elements include a first light emitting element that emits first component color light, a second light emitting element that emits second component color light, and a third light emitting element that emits third component color light. ,
The reflective surface is composed of six surfaces,
The first reflection surface that reflects the first component color light, the second reflection surface that reflects the second component color light, and the third reflection surface that reflects the third component color light are sequentially arranged around the axis. Arranging and providing the first to third reflecting surfaces by two,
The image display element is driven to display an image corresponding to each component color light in synchronization with the light emission timing of the first to third light emitting elements,
The synchronization control unit causes the first to third light emitting elements to emit light at a timing at which the first to third component color lights are reflected by the first to third reflection surfaces of the rotating polyhedral mirror. The projector illumination device according to claim 1. A plurality of light emitting elements having different emission colors are arranged in parallel, and the illumination light emitted from the light emitting elements is sequentially incident on a single optical integrator so that the illumination optical axes of the light emitting elements are parallel to each other in the same plane. In the projector illumination device that generates image light in a frame sequential manner by irradiating an image display element that is driven in synchronization with the light emission timings of the plurality of light emitting elements, with each illumination light incident on the integrator,
A rotating polyhedral mirror in which at least three reflecting surfaces that reflect the illumination light from the light emitting element are arranged around an axis serving as a rotation center;
Synchronization control means for causing the plurality of light emitting elements to sequentially emit light in synchronization with rotation of the rotating polyhedral mirror rotating at a constant speed, and causing illumination light sequentially emitted from the plurality of light emitting elements to enter the light integrator; With
The axis is parallel to a plane including each of the illumination optical axes and perpendicular to each of the illumination optical axes;
The reflective surface has at least three or more inclined surfaces arranged along the axial direction of the axis, and at least one of the angles formed by the adjacent inclined surfaces is different from the other angles. Projector illumination device. The plurality of light emitting elements include a first light emitting element that emits first component color light, a second light emitting element that emits second component color light, and a third light emitting element that emits third component color light. ,
The inclined surface is composed of three surfaces,
A first inclined surface that reflects the first component color light, a second inclined surface that reflects the second component color light, and a third inclined surface that reflects the third component color light along the axial direction. Line up
The image display element is driven to display an image corresponding to each component color light in synchronization with the light emission timing of the first to third light emitting elements,
The synchronization control unit causes the first to third light emitting elements to emit light at a timing at which the first to third component color lights are reflected by the first to third reflection surfaces of the rotating polyhedral mirror. The projector illumination device according to claim 3.   5. The projector according to claim 2, wherein the first to third light emitting elements are light emitting diodes or laser diodes that emit red light, blue light, and green light as component color lights, respectively. Lighting device.

Images