JP2008158190A - Lighting device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illuminator capable of reducing scintillation further and capable of making image quality higher, and to provide a projector. <P>SOLUTION: The illuminator is equipped with: a laser beam source 21A, a light guide member 22 for guiding light emitted from the laser beam source 21A; a light transmitting plate 23 for making the light emitted from the light guide member 22 incident on the image display area of a light valve 16A, and an actuator 24 for temporally changing the incident angle of the light emitted from the light guide member 22 on the light transmitting plate 23. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lighting device and a projector.

  In recent years, projectors are rapidly spreading. In addition to front projection projectors that have been used mainly for business presentation purposes, rear projectors have recently been gaining recognition as a form of large television (PTV: projection television). The greatest advantage of the projection system is that it can supply products with the same screen size at a lower price than direct-view displays such as liquid crystal televisions and PDPs. However, the price reduction is also progressing in the direct view type, and higher image quality performance is being demanded for the projector display device.

  A projector irradiates light modulation means such as a liquid crystal light valve with light emitted from a light source such as an arc lamp, and projects projection light modulated by the light modulation means onto a screen to display an image on the screen. . At this time, not only an image is displayed on the screen, but the entire screen appears glaring. This is due to luminance unevenness caused by the interference of light rays and is called speckle noise, so-called scintillation.

Here, the principle of scintillation generation will be briefly described. As shown in FIG. 10, the light emitted from the light source 101 passes through the liquid crystal light valve 102 and is projected onto the screen 104 by the projection lens 103. The projection light projected on the screen 104 is diffracted by the scattering structure of the screen 104 and diffused by acting like a secondary wave source. Two spherical waves from the secondary wave source appear as light and dark stripes (interference fringes) between the screen 104 and the viewer by causing the light to strengthen and weaken according to the phase relationship between each other. . When the viewer is focused on the image plane 105 where the interference fringes are generated, the viewer recognizes the interference fringes as scintillation for glaring the screen.
Scintillation gives an uncomfortable feeling to a viewer who wants to see an image formed on the screen surface as if a veil, a lace cloth, a spider web, or the like is stretched between the screen surface and the viewer. In addition, the viewer sees a double image of the image on the screen and the scintillation and tries to match the viewpoint with each image, which causes great fatigue. Therefore, this scintillation gives a great stress to the viewer.

  In recent years, new light sources that replace conventional high-pressure mercury lamps have been developed. In particular, laser light sources are excellent in terms of energy efficiency, color reproducibility, long life, and instantaneous lighting. However, the projection light on the screen by the laser light source has very high coherence because the phases of the light beams in the adjacent areas are aligned. In addition, the coherent length of a laser light source can be as long as several tens of meters. Therefore, if the same light source is divided and recombined, the light synthesized through an optical path difference shorter than the coherent length causes strong interference. Thus, a clearer scintillation appears than when a high-pressure mercury lamp is used.

In view of this, a screen having a three-layer structure of a diffusion layer, a transparent layer (lenticular lens), and a diffusion layer and having optimized diffusibility has been proposed (for example, see Patent Document 1). Here, scintillation is reduced by increasing the randomness of interference spots by complicating the scattering layer.
In addition, by applying light, electric field, magnetic field, heat, stress, etc. to the light scattering layer, the shape, relative positional relationship and refractive index of the light scatterer contained in the light diffusion layer are temporally changed. (See, for example, Patent Document 2). Here, scintillation is prevented from occurring by temporally changing the scattering distribution and phase of the scattered wave by the light diffusion layer.
Japanese Patent Laid-Open No. 11-038512 JP 2001-100316 A

However, the following problems remain in the screen described above. That is, in the former screen, since the scattering state of the final scattering surface is fixed, the phase distribution of the space between the screen and the viewer that interferes with light rays emitted from each point on the scattering surface is also fixed. Therefore, the interference spots are also visually recognized as a fixed image. For this reason, the interference spots do not completely disappear, and in particular, a projector having a highly coherent laser light source can hardly obtain the effect. In addition, in such a configuration with high scattering, image blur may occur, and it is difficult to improve image quality.
The latter screen requires a large amount of driving energy to change the shape, relative positional relationship, refractive index, etc. of the light scatterer, and allows comfortable viewing with vibration, sound, unnecessary electromagnetic waves, and exhaust heat. May interfere. In a configuration in which the scattering layer moves in the focal direction, the size of the image changes. For this reason, the position of the contour line of the image in the horizontal direction also changes, which causes image blurring.

  SUMMARY An advantage of some aspects of the invention is that it provides an illumination device and a projector that further reduce scintillation and improve image quality.

  The present invention employs the following configuration in order to solve the above problems. That is, the illumination device according to the present invention includes a light source, a first light guiding unit that guides light emitted from the light source, and light emitted from the first light guiding unit incident on the irradiated surface of the irradiated member. The second light guiding means to be driven, and the driving means for temporally changing the incident angle of the light emitted from the first light guiding means to the second light guiding means.

In the present invention, for example, the interference fringes formed on the projection member change temporally by changing the incident angle of the projection light to the projection member such as a screen temporally. This can further reduce scintillation and improve display image quality.
That is, when the incident angle of the light emitted from the first light guide means to the second light guide means is changed with time, the incident angle of the light emitted from the second light guide means with respect to the irradiated surface is adjusted accordingly. Change over time. Then, the incident angle of the light emitted from the irradiated member with respect to the projected member changes with time according to the incident angle with respect to the irradiated member. Therefore, the scattering state of the light emitted from the projection member varies with time according to the incident angle, and the pattern of interference fringes visually recognized by the projection member changes. This complicates the interference fringe pattern. And since the light inject | emitted from the to-be-projected member is time-integrated and averaged by the afterimage characteristic of a viewer's eyes, an interference fringe is not visually recognized. This is due to the characteristic that the image appears to be displayed uniformly when the image is held for a certain period of time due to an afterimage in the human eye. Therefore, scintillation is further reduced and displayed image quality is improved.

In the illumination device according to the present invention, it is preferable that the driving unit drives the first light guiding unit.
In this invention, the incident angle of the light to the second light guide means is changed by driving the first light guide means arranged closer to the light source on the optical path than the second light guide means. 2 The amount of change can be reduced as compared to driving the light guide means in terms of time. Thereby, while being able to achieve size reduction of an illuminating device, the incident angle with respect to a to-be-irradiated member can be changed at sufficient speed | velocity.

In the illumination device according to the present invention, the first light guide unit may include a flexible light guide member, and the driving unit may drive an emission end of the light guide member. .
In this invention, the drive means drives the exit end of the light guide member to change the direction of the light emitted from the light guide member over time, and the second light guide of the light emitted from the first light guide means. The incident angle with respect to the means is changed with time. Further, the driving means drives the light guide member, so that the incident angle can be temporally changed while maintaining the profile of the light guided through the light guide member.

In the illumination device according to the present invention, the first light guide unit includes a first reflecting mirror that reflects the light emitted from the light source, and the second light guide unit is reflected by the first reflecting mirror. It is good also as having a 2nd reflective mirror which reflects light toward the said to-be-irradiated member, and the said drive means scans the reflected light by a said 1st reflective mirror on the reflective surface of a said 2nd reflective mirror.
In this invention, the reflected light from the first reflecting mirror is scanned on the reflecting surface of the second reflecting mirror, so that the direction of the light emitted from the first reflecting mirror is changed temporally and emitted from the first light guiding means. The incident angle of the received light with respect to the second light guide means is changed with time.

Moreover, it is preferable that the illuminating device concerning this invention is equipped with the optical fuse which interrupts | blocks the light which injects into the said to-be-irradiated surface when the light quantity inject | emitted from the said light source exceeds predetermined value.
According to the present invention, it is possible to prevent other optical members and the like from being affected by an excessive amount of light incident.

According to another aspect of the present invention, there is provided a projector comprising: the above-described illumination device; and a light modulation unit that modulates light emitted from the illumination device in accordance with an image signal. The light modulated by the light modulation unit is projected. It projects on a member.
In the present invention, as described above, since the incident angle of the projection light to the projection target changes with time, the interference fringes change with time. This can further reduce scintillation and improve display image quality.

The projector according to the present invention preferably includes a plurality of the illumination devices, and the plurality of light sources are connected to the same cooling unit.
In the present invention, by connecting a plurality of light sources to the same cooling unit, the light sources can be cooled in a lump, and the apparatus can be downsized.

[First Embodiment]
Hereinafter, a first embodiment of an illumination device and a projector according to the present invention will be described with reference to the drawings. Here, FIG. 1A is a schematic perspective view showing a rear projector, FIG. 1B is a side sectional view, FIG. 2 is a schematic configuration diagram showing a projection optical system, and FIG. 3 is a schematic perspective view showing an illumination device. .

As shown in FIG. 1, a rear projector (projector) 1 according to the present embodiment includes a housing 2 and a screen (projected member) 3 provided on the front surface of the housing 2 to project an image. Openings 5 for outputting sound from speakers are formed on the left and right sides of the front panel 4 provided below the housing 2.
Further, the rear projector 1 includes a projection optical system 10 provided in the housing 2, and reflection mirrors 11 and 12 that reflect light emitted from the projection optical system 10 and project it on the screen 3 in an enlarged manner.

  As shown in FIG. 2, the projection optical system 10 includes a red light illumination device 15A that emits red light, a green light illumination device 15B that emits green light, a blue light illumination device 15C that emits blue light, Light valves (light modulation means, irradiated members) 16A to 16C for modulating laser light emitted from the illumination devices 15A to 15C, a dichroic prism 17, and a projection lens 18 are provided. In FIG. 2, illustration of the reflection mirrors 11 and 12 disposed between the projection lens 18 and the screen 3 is omitted.

First, the red light illumination device 15A will be described. In addition, in this embodiment, since the structure of each illuminating device 15A-15C is the same, only red light illuminating device 15A is demonstrated and description of green light illuminating device 15B and blue light illuminating device 15C is abbreviate | omitted.
As shown in FIGS. 2 and 3, the red light illumination device 15A includes a laser light source (light source) 21A, a light guide member (first light guide means) 22 that guides light emitted from the laser light source 21A, and a light guide. A light guide plate (second light guide means) 23 that guides light emitted from the optical member 22 and emits the light toward the light valve 16A, and an actuator (drive means) 24 that vibrates the light guide member 22 are provided. .

  The laser light source 21 </ b> A includes a plurality of laser elements (not shown) arranged in an array therein, and has a configuration in which red laser light is emitted from the emission end toward the light guide member 22. The laser light source 21A is connected to a cooling unit 25 configured by, for example, a heat sink for cooling the laser light source 21A. Note that the laser light source 21A may include only one laser element.

The light guide member 22 includes an optical fiber 31 and a lens 32 provided at the tip of the optical fiber 31.
The optical fiber 31 has flexibility, and the base end is connected to the emission end of the laser light source 21A. The optical fiber 31 is configured to guide the red laser light emitted from the laser light source 21 </ b> A and emit the red laser light from the tip (exit end). Further, the optical fiber 31 is provided with an optical fuse 33 that blocks the light guide in the optical fiber 31 when the amount of light guided in the optical fiber 31 exceeds a predetermined value. The optical fuse 33 is made of a material that is transmissive to a light amount that is equal to or smaller than a predetermined value and that is non-transmissive to a light amount that exceeds a predetermined value. The optical fiber 31 is detachably connected to the laser light source 21A by a connector (not shown) or the like.
The lens 32 has a configuration in which the red laser light emitted from the tip of the optical fiber 31 is enlarged and emitted toward the light guide plate 23.

  The light guide plate 23 is made of a substantially plate-like translucent material, and one surface thereof faces the light valve 16 </ b> A and one side surface thereof faces the front end surface of the lens 32. The other surface of the light guide plate 23 is an uneven surface (shown in FIG. 3). Therefore, the light guide plate 23 reflects the red laser light emitted from the lens 32 on the uneven surface and emits the light toward the light valve 16A from one surface, and uniformly covers the entire image display area (irradiated surface) of the light valve 16A. It is the composition which irradiates to.

The actuator 24 is composed of a piezo actuator mainly composed of a piezo element that expands or contracts by applying a voltage, for example. Here, the piezo element has a configuration in which thin piezo films and electrodes are alternately stacked in order to increase the amount of displacement. The actuator 24 is provided at the tip of the optical fiber 31 and is configured to vibrate the tip of the optical fiber 31 together with the lens 32 in the thickness direction of the light guide plate 23. Therefore, the incident angle of the laser light emitted from the lens 32 with respect to the light guide plate 23 changes with time by the actuator 24. Here, the vibration frequency by the actuator 24 is 60 Hz, for example, and the change width of the incident angle by the actuator 24 is ± 20 °, for example.
The actuator 24 is not limited to an actuator using a piezo element that expands or contracts due to application of a voltage, but can be expanded or contracted by an electrostatic force or an electromagnetic actuator that expands or contracts by an electromagnetic force as long as the tip of the optical fiber 31 can vibrate. Other actuators such as an electrostatic actuator may be used.

  As described above, since the green light illumination device 15B and the blue light illumination device 15C have the same configuration as the red light illumination device 15A, the laser light source (light source) 21B that emits green laser light and the blue laser light are emitted. Each is provided with a laser light source (light source) 21C for emitting. These laser light sources 21 </ b> A to 21 </ b> C are arranged close to each other and connected to the same cooling unit 25.

As shown in FIG. 2, each of the light valves 16A to 16C is composed of, for example, a liquid crystal device. Each of the light valves 16A to 16C is configured to emit laser light emitted from each of the lighting devices 15A to 15C based on an image signal supplied to the image display area. It is the structure which modulates. In addition, polarizing plates (not shown) are provided on the incident side and the emission side of the light valves 16A to 16C, respectively.
The dichroic prism 17 is formed by bonding four right-angle prisms, and a dielectric multilayer film 17a that reflects red light and a dielectric multilayer film 17b that reflects blue light are formed in an X shape at the interface. Is formed.
The projection lens 18 is configured to enlarge and project the color image synthesized by the dichroic prism 17 onto the screen 3.

  In the rear projector 1 configured as described above, red laser light, green laser light, and blue laser light emitted from the illumination devices 15A to 15C are incident on the light valves 16A to 16C, respectively. The laser beams incident on the light valves 16A to 16C are modulated based on the image signals supplied to the light valves 16A to 16C and enter the dichroic prism 17. Thereafter, the laser beams incident on the dichroic prism 17 are combined by the dielectric multilayer films 17 a and 17 b and projected onto the screen 3 through the projection lens 18 and the reflection mirrors 11 and 12.

Here, in the red light illumination device 15 </ b> A, the red laser light emitted from the laser light source 21 </ b> A is guided through the optical fiber 31 and emitted from the front end surface of the optical fiber 31 through the lens 32 toward the side surface of the light guide plate 23. . Then, the red laser light guided in the light guide plate 23 is reflected by the uneven surface on the other surface of the light guide plate 23 and is emitted from one surface of the light guide plate 23 toward the light valve 16A.
At this time, the actuator 24 provided at the tip of the optical fiber 31 changes the incident angle of light incident on the side surface of the light guide plate 23 from the lens 32 at a frequency of 60 Hz, for example, according to the applied electrical signal. For example, the tip of the optical fiber 31 is vibrated so as to be ± 20 °. Thereby, the emission direction of the red laser light emitted from the lens 32 and the incident angle with respect to the side surface of the light guide plate 23 periodically change. For this reason, the incident angle of the red laser light emitted from one surface of the light guide plate 23 with respect to the light valve 16A periodically changes as shown in FIGS. Therefore, the incident angle of the red laser beam with respect to the screen 3 changes with time.

At this time, since the change amount of the incident angle of the light incident on the side surface of the light guide plate 23 from the lens 32 is set to ± 20 °, for example, the change amount of the incident angle of the projection light to the screen 3 is ± 5 ° or more. Further, regardless of the incident position of the red laser light on the light guide plate 23, the red laser light emitted from the light guide plate 23 uniformly irradiates the entire image display area of the light valve 16A.
In the green light illuminating device 15B and the blue light illuminating device 15C, the incident angles of the green laser light and the blue laser light with respect to the screen 3 are temporally changed as in the red light illuminating device 15A.

  The pattern of interference fringes generated on the screen 3 changes according to the incident angle of the projection light on the screen 3. The incident angle of the projection light is periodically changed at a frequency of, for example, 60 Hz by the actuator 24 provided in each of the lighting devices 15A to 15C. For this reason, the scattering state of the light emitted from the screen 3 changes variously according to the incident angle to the screen 3, and the pattern of the interference fringe visually recognized on the screen 3 changes temporally and becomes complicated. Here, the human eye has a characteristic that the image is visually recognized in a state where the image is uniformly displayed because the image is held for a certain period of time due to the afterimage. As a result, the interference fringe pattern formed on the screen 3 is time-integrated and averaged by the afterimage characteristics of the viewer's eyes. At this time, since the amount of change in the incident angle of the projection light on the screen 3 is ± 5 ° or more, the interference fringe pattern is sufficiently complicated. Therefore, the interference fringe pattern averaged by the time integration is not visually recognized by the viewer.

As described above, according to the illuminating devices 15A to 15C and the rear projector 1 according to the present embodiment, the incident angle of the light incident on the screen 3 is periodically changed by the actuator 24, so that the interference fringes formed on the screen 3 Changes over time. This can further reduce scintillation and improve display image quality.
Further, since the optical fiber 31 is vibrated by the actuator 24, the movement amount due to the vibration is smaller than when the incident angle to each of the light valves 16A to 16C is temporally changed by vibrating the light guide plate 23. Can be suppressed. Thereby, while being able to change an incident angle at sufficient speed, size reduction of illuminating device 15A-15C can be achieved.
By providing the optical fuse 33 in the optical fiber 31, it is possible to prevent an excessive amount of laser light from entering the optical members such as the light valves 16A to 16C, and the reliability of the illumination devices 15A to 15C is improved.
Further, by connecting the laser light sources 21A to 21C constituting the respective illumination devices 15A to 15C to the same cooling unit 25, the laser light sources 21A to 21C can be integrally cooled, and the rear projector 1 can be reduced in size.

[Second Embodiment]
Next, a second embodiment of the illumination device and the projector according to the present invention will be described with reference to the drawings. Here, FIG. 5 is a schematic configuration diagram showing the illumination device, and FIG. 6 is a schematic perspective view of the illumination device. In this embodiment, since the configuration of the lighting device is different from that of the first embodiment, this point will be mainly described, and the same reference numerals are given to the components described in the above embodiment, and the description thereof will be omitted. To do. Also in this embodiment, since the configurations of the red light illumination device, the green light illumination device, and the blue light illumination device are the same, only the red light illumination device will be described, and the green light illumination device and the blue light illumination device will be described. Is omitted.

As shown in FIGS. 5 and 6, the red light illumination device 50 in the present embodiment includes a field lens (second light guide member) 51 that uniformly irradiates light emitted from the optical fiber 31 toward the light valve 16 </ b> A. I have.
The field lens 51 is configured to irradiate the entire surface of the image display area of the light valve 16 </ b> A with the light emitted from the lens 32.
The actuator 24 is configured to vibrate the tip of the lens 32 in a direction along the curved surface of the field lens 51, for example, at a frequency of 60 Hz. Therefore, the incident angle of the laser light emitted from the lens 32 with respect to the field lens 51 is periodically changed by the actuator 24 so as to scan along the peripheral surface of the field lens 51.

In the red light illumination device 50 as described above, the red laser light emitted from the laser light source 21 </ b> A is emitted from the front end surface of the lens 32 toward the field lens 51 as described above. The red laser light emitted from the field lens 51 uniformly irradiates the entire image display area of the light valve 16A.
At this time, the red laser light emitted from the lens 32 periodically scans the peripheral surface of the field lens 51 by the actuator 24. As a result, the incident angle of the red laser light emitted from the field lens 51 with respect to the light valve 16A changes with time as shown in FIG. Therefore, the incident angle of the red laser light with respect to the screen 3 changes periodically. Here, regardless of whether the incident position of the red laser light is the field lens 51, the red laser light emitted from the field lens 51 uniformly irradiates the entire image display region of the light valve 16A.

  As described above, the red light illumination device 50 and the rear projector including the same in the present embodiment also have the same operations and effects as those in the first embodiment described above.

[Third Embodiment]
Next, a third embodiment of the illumination device and the projector according to the present invention will be described with reference to the drawings. Here, FIG. 8 is a schematic configuration diagram showing the illumination device, and FIG. 9 is a schematic perspective view showing the illumination device. In this embodiment, since the configuration of the lighting device is different from that of the first embodiment, this point will be mainly described, and the same reference numerals are given to the components described in the above embodiment, and the description thereof will be omitted. To do. Also in this embodiment, since the configurations of the red light illumination device, the green light illumination device, and the blue light illumination device are the same, only the red light illumination device will be described, and the green light illumination device and the blue light illumination device will be described. Is omitted.

As shown in FIGS. 8 and 9, the red light illumination device 60 in the present embodiment includes a scanning mirror (first light guide unit) 62 that reflects light emitted from the laser light source 61, and reflected light from the scanning mirror 62. Is provided with an optical path correction mirror (second light guide means) 63 that reflects the light toward the light valve 16A and an actuator 64 that drives the scanning mirror 62.
The laser light source 61 is configured to emit red laser light expanded in a planar shape.
The scanning mirror 62 is configured to reflect the light emitted from the laser light source 21 </ b> A toward the optical path correction mirror 63.
The optical path correction mirror 63 is configured to reflect the reflected light from the scanning mirror 62 toward the entire image display area of the light valve 16A.
The actuator 64 is configured by, for example, a galvano actuator, and is configured to swing the scanning mirror 62 around the rotation axis so that the reflected light from the scanning mirror 62 scans on the reflection surface of the optical path correction mirror 63. ing.

In the red light illumination device 60 as described above, the red laser light emitted from the laser light source 61 is reflected by the scanning mirror 62 and the optical path correction mirror 63. Then, the red laser light emitted from the optical path correction mirror 63 uniformly irradiates the entire image display area of the light valve 16A.
At this time, the red laser light reflected by the scanning mirror 62 periodically scans the reflection surface of the optical path correction mirror 63 by the actuator 64. As a result, the incident angle of the red laser light reflected by the optical path correction mirror 63 with respect to the light valve 16A changes with time as shown in FIG. Therefore, the incident angle of the red laser light with respect to the screen 3 changes periodically. Here, the red laser light reflected by the optical path correction mirror 63 irradiates the entire surface of the image display area of the light valve 16A even if the incident position of the red laser light is any of the reflection surfaces of the optical path correction mirror 63. To do.

  As described above, the red light illumination device 60 and the rear projector including the same in the present embodiment also have the same operations and effects as those in the first and second embodiments described above.

In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in the above-described embodiment, the optical fiber and the reflection mirror that constitute the first light guide means are driven by the actuator, so that the laser light that enters the light guide plate, the field lens, and the optical path correction mirror that constitutes the second light guide means. However, if the incident angle of the incident light to the second light guide means can be changed with time, the second light guide means may be driven by a drive means such as an actuator or the first And it is good also as a structure which drives both the 2nd light guide means.
In addition, the configuration of the first light guide unit is not limited to the light guide member and the reflection mirror as long as the light emitted from the laser light source can be guided, and other light guide members may be used. Similarly, the configuration of the second light guide means is not limited to the light guide plate, the field lens, and the optical path correction mirror as long as the light emitted from the first light guide means can be irradiated onto the image display area of the light valve. May be used.
Then, the incident angle of the light incident on the light valve is periodically changed at a frequency of 60 Hz by the actuator. However, if the interference fringe pattern becomes invisible due to the afterimage characteristics of the viewer's eyes, the other frequencies are used. Alternatively, a configuration that does not change periodically may be used.
Furthermore, although the optical fiber and the reflection mirror are driven by the actuator, the optical fiber and the reflection mirror may be driven by other members.

The laser light source has a configuration in which a plurality of laser elements are arranged in an array, but may have a configuration including only one laser element.
Although a laser light source that emits laser light is used as a light source, other light sources such as light emitted from an LED (Light Emitting Diode) element may be used.
Furthermore, the optical fuse is made of a material that is impermeable to a light amount exceeding a predetermined value. However, if light irradiation to the light valve is prevented when the light amount exceeds a predetermined value, other light fuses may be used. It may be a configuration.
In addition, although three laser light sources are arranged close to each other and connected to the same cooling unit, they may be connected to different cooling units.

In addition, although a light valve that is a transmissive liquid crystal device is used as the light modulating means, other light modulating means such as a reflective liquid crystal device or a digital micromirror device may be used.
The projector is not limited to the rear projector, and other projectors such as a front projection projector that has a projection optical system and projects the projection light from the projection optical system onto a screen separately provided to observe the reflected light. It may be.

It is the schematic perspective view and sectional drawing which show the rear projector of 1st Embodiment. It is a schematic block diagram which shows the projection optical system of FIG. It is a schematic perspective view which shows the illuminating device of FIG. It is explanatory drawing explaining the drive state by an actuator. It is a schematic block diagram which shows the illuminating device in 2nd Embodiment. FIG. 6 is a schematic perspective view of FIG. 5. It is explanatory drawing explaining the drive state by an actuator. It is a schematic block diagram which shows the illuminating device in 3rd Embodiment. It is a schematic perspective view of FIG. It is explanatory drawing which shows the principle of scintillation.

Explanation of symbols

1 Rear projector (projector), 3 screen (projected member), 15A, 50, 60 Red light illumination device (illumination device), 15B Green light illumination device (illumination device), 15C Blue light illumination device (illumination device), 16A ˜16C light valve (irradiated member, light modulation means), 21A to 21C, 61 laser light source (light source), 22 light guide member (first light guide means), 23 light guide plate (second light guide means), 24, 64 Actuators (drive means), 25 Cooling units, 33 Optical fuses, 51 Field lenses (second light guide means), 62 Scanning mirrors (first light guide means), 63 Optical path correction mirrors (second light guide means)

Claims (7)

A light source;
First light guiding means for guiding light emitted from the light source;
Second light guide means for causing the light emitted from the first light guide means to enter the irradiated surface of the irradiated member;
An illuminating apparatus comprising: a driving unit that temporally changes an incident angle of light emitted from the first light guiding unit to the second light guiding unit.   The lighting device according to claim 1, wherein the driving unit drives the first light guiding unit. The first light guide means has a flexible light guide member;
The lighting device according to claim 2, wherein the driving unit drives an exit end of the light guide member. The first light guide means includes a first reflecting mirror that reflects light emitted from the light source, and
The second light guide means includes a second reflecting mirror that reflects light reflected by the first reflecting mirror toward the irradiated member;
The lighting device according to claim 2, wherein the driving unit scans light reflected by the first reflecting mirror on a reflecting surface of the second reflecting mirror.   5. The illumination device according to claim 1, further comprising: an optical fuse that blocks light incident on the irradiated surface when a light amount emitted from the light source exceeds a predetermined value. 6. The lighting device according to any one of claims 1 to 5,
Light modulation means for modulating light emitted from the illumination device according to an image signal,
A projector that projects light modulated by the light modulation means onto a projection target member. A plurality of the lighting devices;
The projector according to claim 6, wherein the plurality of light sources are connected to the same cooling unit.

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