JP2008175869A - Light source device, illumination device, monitor device, image display device, and projector - Google Patents

Abstract

To provide a light source device, an illumination device, a monitor device, an image display device, and a projector capable of reducing the occurrence of scintillation.
Since the light reflecting element for changing the traveling direction of the laser beam within a predetermined angle range with respect to the emitting direction of the laser beam is provided, the traveling direction of the laser beam emitted from the laser light source is temporally changed. Can be varied. As the traveling direction of the laser light varies with time, the scattering direction when the laser light is scattered varies with time. As a result, the position of the interference fringes of the scattered light is shifted in time, and the interference fringes are leveled. Thereby, the light source device 4 that can reduce the occurrence of scintillation can be obtained.
[Selection] Figure 1

Description

  The present invention relates to a light source device, an illumination device, a monitor device, an image display device, and a projector.

In a projection display device (projector) that projects image light generated by a light modulation device such as a liquid crystal device onto a screen using a projection system, a technique using a laser light source as a light source device for image light has been proposed. In such a projector, in order to obtain a desired image, it is important to irradiate the incident surface of the light modulation device with laser light with a uniform illuminance distribution. Patent Document 1 describes a configuration in which a diffusion plate is provided between a laser light source and a light modulation device. It has been disclosed to reduce the occurrence of scintillation by diffusing laser light with a diffusion plate.
Japanese Patent Laid-Open No. 6-208089

However, in the method described in Patent Document 1, since the light is simply diffused by the diffusion plate, even if the scintillation pattern can be moved on the screen, it means that the diffusion degree of the diffusion plate (for example, the randomness of the surface structure) It is difficult to say that the configuration can effectively reduce scintillation. There are similar problems not only in projectors but also in illumination devices, monitor devices, image display devices, and the like.
Furthermore, since the diffusion by the diffusion plate is used, for example, when the light is incident on the projection lens of the projector, there is a problem that the projection lens is out of the incident angle range of the light that can effectively project the light and the light loss occurs. is there.

  In view of the circumstances as described above, an object of the present invention is to provide a light source device, a lighting device, a monitor device, and an image display capable of reducing the occurrence of scintillation more reliably and effectively and having high light utilization efficiency. It is to provide an apparatus and a projector.

In order to achieve the above object, a light source device according to the present invention includes a light source that emits laser light, and a fluctuating unit that varies the traveling direction of the laser light within a predetermined angular range with respect to the emission direction of the laser light. And illuminating means for illuminating a predetermined area with the laser beam whose traveling direction varies by the varying means.
According to the present invention, since the moving means for changing the traveling direction of the laser light within a predetermined angle range with respect to the emitting direction of the laser light is provided, the traveling direction of the laser light emitted from the light source is temporally changed. Can be made. When the traveling direction of the laser light varies with time, for example, the scattering direction when the laser light is scattered by the screen when projected by the projector varies with time in a desired locus. As a result, the position of the interference of the scattered light is shifted in time, and the interference is leveled over the entire laser beam. Thereby, the light source device which can reduce generation | occurrence | production of scintillation more reliably and effectively can be obtained. In addition, for example, when the light is incident on the projection lens of the projector, the light use efficiency is set by setting the angle change by the changing means within the light incident angle range (projection lens enveloping angle) in which the projection lens can effectively project light. High light source device can be realized.

The light source device is characterized in that the illumination means has a computer-generated hologram provided on the optical path of the laser light.
A light source device used in a projector needs to make image light incident on a projection lens of the projector. According to the present invention, since the illuminating unit has the computer-generated hologram provided on the optical path of the laser light, the emission angle of the illuminating light can be adjusted to a desired angle.

In the above light source device, the fluctuating means is provided on the optical path of the laser light, and includes a light reflecting element that can reflect the laser light, and a reflection angle control means that controls a light reflection angle of the light reflecting element. It is characterized by having.
According to the present invention, the changing means includes a light reflecting element that is provided on the optical path of the laser light and can reflect the laser light, and a reflection angle control means that controls the light reflection angle of the light reflecting element. Therefore, the traveling direction of the laser light can be changed at a desired angle.

In the above light source device, the fluctuating means is provided on the optical path of the laser light, and includes a light refraction element capable of refracting the laser light, and a refraction angle control means for controlling a light refraction angle of the light refraction element. It is characterized by having.
According to the present invention, the variation means includes the photorefractive element that is provided on the optical path of the laser light and can refract the laser light, and the refraction angle control means that controls the light refraction angle of the photorefractive element. The traveling direction of the laser beam can be changed at a desired angle.

In the above light source device, the fluctuating unit controls an electro-optic crystal provided on the optical path of the laser light, a voltage applying unit that applies a voltage to the electro-optic crystal, and a voltage that is applied to the electro-optic crystal. And a voltage control means.
According to the present invention, the varying means includes an electro-optic crystal provided on the optical path of the laser light, a voltage applying means for applying a voltage to the electro-optic crystal, and a voltage for controlling the voltage applied to the electro-optic crystal. Therefore, a desired voltage can be applied to the electro-optic crystal, and as a result, the traveling direction of the laser light can be varied at a desired angle.

An illumination device according to the present invention includes the light source device described above.
According to the present invention, since the above-described light source device is provided, it is possible to obtain an illumination device that can more reliably and effectively reduce the occurrence of scintillation.

A monitor device according to the present invention includes the light source device described above, a light transmission unit that transmits light emitted from the light source device, and a sensor unit that senses an object using the light transmitted by the light transmission unit. It is characterized by doing.
According to the present invention, since the above light source device is provided, a monitor device capable of reducing the occurrence of scintillation more reliably and effectively can be obtained.

An image display device according to the present invention includes the light source device described above and a light modulation unit that modulates light emitted from the light source device.
According to the present invention, the above-described light source device capable of shifting the position of interference in time and the light modulation means for modulating the light emitted from the light source device are provided. In the image formed by the apparatus, the interference fringes are leveled. Since the observer observes the standardized image in this way, the scintillation felt by the observer is reduced.

A projector according to the present invention includes the light source device described above, a light modulation unit that modulates light emitted from the light source device, and a projection lens that projects light modulated by the light modulation unit. And
According to the present invention, a light source device capable of shifting the position of interference in time, a light modulation unit that modulates light emitted from the light source device, and a projection that projects light modulated by the light modulation unit Since the lens is provided, interference fringes are leveled in the projected image. Since the observer observes the standardized image in this way, the scintillation felt by the observer is reduced.

[First Embodiment]
A first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration of a projector 1 according to the present embodiment.
As shown in the figure, the projector 1 is composed mainly of an image display device 2 and a projection lens 3, and the projection light from the projector 1 is projected onto the screen S.

The image display device 2 includes a light source device 4 and a light modulation device 5.
The light source device 4 includes a laser light source 6, a light reflecting element 7, a control unit 8, a condenser lens 9, and an optical element 10.

  The laser light source 6 includes, for example, a laser light source that emits red light, green light, or blue light, and emits laser light in a predetermined direction. The light reflecting element 7 includes, for example, a MEMS (Micro Electro Mechanical Systems) mirror that can reflect the laser light, and is provided on the optical path of the laser light. The control unit 8 temporally controls the position and rotation of the light reflecting element 7 so that the reflection angle of the light reflecting element 7 becomes a desired angle. The condenser lens 9 is a convex lens that is provided on the optical path of the laser light reflected by the light reflecting element 7 and condenses the laser light. The front focal position of the condenser lens 9 is preferably located on the light reflecting element 7 and the rear focal position is preferably located on the light modulation device 5.

  The optical element 10 is composed of, for example, a computer generated hologram (CGH), and is provided on the optical path of the laser light. The computer-generated hologram has a configuration in which interference fringes artificially created by calculation with a computer are formed on the hologram original plate. The computer-generated hologram can be used preferably because it can freely set the divided region of the diffraction grating and does not cause an aberration problem. The optical element 10 made of a computer-generated hologram has an illumination area setting function. The CGH can also be configured so that the light from the laser light has uniform illuminance on the light modulation device 5.

  The light modulation device 5 constituting the image display device 2 is an element that modulates laser light from the light source device 4 based on a predetermined image signal, and is, for example, a transmissive light valve having a TFT active matrix liquid crystal device or the like. is there.

  The projection lens 3 constituting the projector 1 projects the image light emitted from the image display device 2 onto the screen S. The projection lens 3 has an angle range (stagnation angle) of light that can be effectively projected by itself. Light that travels beyond the range of the included angle cannot be projected.

Next, the operation of the projector 1 configured as described above will be described.
The control unit 8 causes the reflection angle of the light reflecting element 7 to vary with time. The laser light emitted from the laser light source 6 is reflected at a predetermined angle by the light reflecting element 7. The predetermined angle is set by the control unit 8 so that the light emitted from the image display device 2 falls within the range of the included angle of the projection lens 3. As a result, the traveling direction of the laser light varies within a predetermined angle range. For example, a path A (shown by a solid line) and a path B (shown by a broken line) are shown in FIG. The fluctuation in the traveling direction of the laser beam can be varied so that the locus of the incident position of the laser beam incident on the incident surface of the condenser lens 9 has, for example, a circular shape. Details will be described with reference to FIG.

  The laser light reflected by the light reflecting element 7 is condensed by the condenser lens 9 and enters the optical element 10. The incident light is incident in different directions for the route A and the route B. The laser light is diffused by the diffused light generation function of the optical element 10 to form a uniform illuminance distribution. The laser light having a uniform illuminance distribution is set in a predetermined area by the illumination area setting function of the optical element 10. In the optical element 10, the illumination area may be set so that the light emitted from the image display device 2 falls within the range of the included angle of the projection lens 3. Laser light is emitted in the set illumination area.

  The laser light emitted from the light source device 4 enters the light modulation device 5 and is modulated into predetermined image light. From the image display device 2, the image light modulated in this way is emitted. The angle difference α between the image light A and the image light B, which is a part of the image light emitted from the image display device 2, varies, for example, in the range of −4 ° to 4 °.

  The image light emitted from the image display device 2 enters the projection lens 3. By adjusting the angle of the laser light in the light reflecting element 7 (the optical element 10 if necessary), the image light is incident within the range of the included angle of the projection lens 3. The incident image light is projected onto the screen S at a predetermined angle β. Thus, the image display by the projector 1 is performed. Note that the projection angle determined by the F value of the projection lens 3 including the image light A and the image light B projected on the screen S is, for example, approximately 13 ° in the case of the F2 lens. Therefore, the angle changed by the light reflecting element 7 may be set to be within 13 ° at the position incident on the projection lens. Furthermore, in addition to the fluctuation of the angle due to the light reflecting element, the spread of the angle of the light due to the optical element 10 is taken into consideration, and the sum of them is configured to be within 13 ° at the position where it enters the projection lens. Thus, the loss of light can be further reduced. Further, a plane P shown in FIG. 1 indicates a speckle surface with respect to the path A and the path B of the laser beam.

  In the operation of the projector 1, laser light is scattered on, for example, the optical element 10 or the surface of the screen S between the time when it is emitted from the laser light source 6 and the time when it is projected onto the screen S. In FIG. 2, the laser beams at this time are represented as L1 and L2. When the laser light L1 and the laser light L2 are scattered by the scattering nuclei C1 and C2 of the optical element 10 or the screen S, the scattered light interferes at the position Q. Interference fringes due to this interference are displayed on the screen S. When the position of this interference remains at the position Q, the interference fringes are recognized by the observer and recognized as scintillation.

On the other hand, according to the present embodiment, since the light reflecting element 7 that varies the traveling direction of the laser light within a predetermined angle range with respect to the emitting direction of the laser light is provided, the light is emitted from the laser light source 6. The traveling direction of the laser beam can be varied with a desired trajectory in time. As the traveling direction of the laser light varies with time, the scattering direction when the laser light is scattered varies with time. As a result, the position Q of the scattered light interference is shifted in time, and the interference fringes formed on the screen S are leveled. Thereby, the light source device 4 that can reduce the occurrence of scintillation can be obtained.
FIGS. 7A to 7D show an example of the position Q of interference observed on the plane P. FIG. FIG. 7C shows an example of reciprocating motion. As shown in the figure, the interference positions reciprocate and are dispersed in time. This can be realized by operating the changing means so that the locus of the incident position where the laser light is incident on the incident surface of the condenser lens 9 is reciprocating. FIG. 7 (d) depicts a figure of eight, and compared to the reciprocating motion, there is no time for the interference position to stop instantaneously, resulting in better dispersion of the interference position. This can be realized by scanning the fluctuating means so that the locus of the incident position at which the laser light is incident on the incident surface of the condenser lens 9 is a figure eight. Further, FIG. 7A is circular, and FIG. 7B is elliptical. In this way, in the case of a circle or an ellipse, the interference position can be continuously moved over a wide range without being stationary, so that the recognition of scintillation can be most suppressed. In addition, a sufficient effect can be obtained when the moving diameter of the interference position at this time is about 5 mm to 0.2 mm or less. These can be realized by scanning the fluctuating means so that the locus of the incident position where the laser beam is incident on the incident surface of the condenser lens 9 is a circle or an ellipse.

  In the present embodiment, since the light source device 4 that can shift the position of interference in terms of time is provided, interference fringes are leveled in the image formed by the image display device 2 and the projector 1. Will be. Since the observer observes the standardized image in this way, the scintillation felt by the observer is reduced.

  A light source device used in a projector needs to make image light incident on a projection lens of the projector. On the other hand, according to the present embodiment, since the illumination unit has the computer-generated hologram provided on the optical path of the laser light, the light emission angle can be adjusted to a desired angle. Thereby, for example, when the emitted light is incident on the projection lens 3 of the projector 1, the light can be emitted within an angle range in which the light can be incident.

  Further, according to the present embodiment, the light reflecting element 7 that is provided on the optical path of the laser light and can reflect the laser light as the changing means for changing the traveling direction of the laser light, and the light reflection angle of the light reflecting element 7 Therefore, the traveling direction of the laser beam can be changed at a desired angle.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. Similar to the first embodiment, in the following drawings, the scale is appropriately changed to make each member a recognizable size. In this embodiment, since the member used as a fluctuation | variation means differs from 1st Embodiment, it demonstrates centering on this point.

  As in the first embodiment, the projector 101 is mainly configured by the image display device 102 and the projection lens 103, and the projection light from the projector 101 is projected onto the screen S. The image display device 102 includes a light source device 104 and a light modulation device 105. The light source device 104 includes a laser light source 106, a photorefractive element 107, a control unit 108, a condenser lens 109, and an electro-optical element 110.

  This embodiment is different from the first embodiment in that a photorefractive element 107 is provided as a changing means for changing the traveling direction of laser light. The photorefractive element 107 includes, for example, a prism having a predetermined light refractive index n (n> 1), and is provided on the optical path of laser light between the laser light source 106 and the condenser lens 109.

  In the photorefractive element 107, a laser light incident surface 107a is formed perpendicular to the optical axis of the laser light, and a laser light emission surface 107b is inclined with respect to the optical axis of the laser light. The photorefractive element 107 is provided so as to be rotatable about the optical axis of the laser light as a central axis. The control unit 108 controls the rotation speed, rotation timing, etc. of the photorefractive element 107.

Next, the operation of the projector 101 configured as described above will be described focusing on the operation of the photorefractive element 107.
First, the photorefractive element 107 is rotated with the optical axis of the laser light as the central axis. The laser light emitted from the laser light source 106 enters the photorefractive element 107 and is emitted from the exit surface 107 b of the photorefractive element 107. At the time of emission, the light is emitted in a direction refracted with respect to the light exit surface 107b due to the difference between its own light refractive index n and the external light refractive index. By being emitted in this way, the traveling direction of the laser light changes.

  In this embodiment, since the photorefractive element 107 is rotated about the optical axis of the laser light as the central axis, the direction of refraction changes. This refraction direction is preferably set in accordance with the squeezing angle of the projection lens 103, as in the first embodiment. As a result, the traveling direction of the laser light changes so that the locus of the incident position of the laser light incident on the incident surface of the condenser lens 109 draws a circle.

  As described above, according to the present embodiment, the photorefractive element 107 that can refract the laser light is provided on the optical path of the laser light, and the control unit 108 that controls the light refraction angle of the photorefractive element 107 is provided. The traveling direction of the laser beam can be changed. In this case, the traveling direction of the laser light can be adjusted by adjusting the angle of the exit surface 107b of the photorefractive element 107.

[Third Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. Similar to the first embodiment, in the following drawings, the scale is appropriately changed to make each member a recognizable size. In this embodiment, since the member used as a fluctuation | variation means differs from 1st Embodiment, it demonstrates centering on this point.

  Similar to the first embodiment, the projector 201 is mainly configured by an image display device 202 and a projection lens 203, and projection light from the projector 201 is projected onto the screen S. The image display device 202 includes a light source device 204 and a light modulation device 205. The light source device 204 includes a laser light source 206, a KTN crystal element 207, a power source 208a, a control unit 208b, a condensing lens 209, and an electro-optical element 210.

This embodiment is different from the first embodiment in that a KTN crystal element 207 is provided as a changing means for changing the traveling direction of laser light.
The KTN crystal element 207 is mainly composed of a KTN crystal 207a, a first electrode 207b, and a second electrode 207c.

The KTN crystal 207a is a dielectric crystal (electro-optic crystal) having an electro-optic effect. In this embodiment, the KTN crystal 207a is made of a crystal material having a composition of KTN (potassium niobate tantalate, KTa _1-X Nb _X O ₃ ), and has a substantially cubic shape. The KTN crystal 207a is deformed by applying an electric field, and the deformation allows the traveling direction of laser light traveling in the crystal 207a to be bent to any electrode side. .

  The first electrode 207b is provided on one surface (upper surface in the drawing) of two parallel surfaces (upper and lower surfaces in the drawing) of the KTN crystal 207a. The second electrode 207c is provided on the opposite surface (the lower surface in the drawing) of the first electrode 207b. The first electrode 207b and the second electrode 207c have substantially the same dimension in the traveling direction of the laser light L as the KTN crystal 207a.

  A power supply 208a for applying a voltage is connected to the first electrode 207b and the second electrode 207c. The power source 208a is connected to a control unit 208b that controls voltage, and a desired electric field can be applied between the first electrode 207b and the second electrode 207c.

Next, the operation of the projector 201 configured as described above will be described focusing on the operation of the KTN crystal element 207.
First, an electric field is applied to the KTN crystal element 207. When the laser light emitted from the laser light source 206 enters the KTN crystal element 207, the KTN crystal 207a is deformed by the influence of the electric field. By this deformation, the laser light is bent and emitted to either the first electrode 207b or the second electrode 207c. By being emitted in this way, the traveling direction of the laser light changes.

  In the present embodiment, the direction of refraction changes by changing the electric field applied between the first electrode 207b and the second electrode 207c. This refraction direction is preferably set according to the squeezing angle of the projection lens 203, as in the first embodiment. As a result, the traveling direction of the laser light varies so that the locus of the incident position of the laser light incident on the incident surface of the condenser lens 209 oscillates in the linear direction.

  Thus, according to the present embodiment, the KTN crystal element 207, the power source 208a that applies a voltage to the KTN crystal element 207, and the control unit 208b that controls the voltage applied to the power source 208a are provided. By applying a desired voltage to the KTN crystal element 207, the traveling direction of the laser beam can be varied at a desired angle.

  In the present embodiment, the first electrode 207b and the second electrode 207c are provided on the upper and lower surfaces of the KTN crystal 207a, respectively. However, the present invention is not limited to this, and the front-rear side of the drawing is not limited thereto. The first electrode 207b and the second electrode 207c may be provided on the surface.

  Further, a configuration may be adopted in which a pair of electrodes is provided on each of the upper and lower surfaces and the front and back surfaces in the drawing, and a power source is connected to each of the upper and lower and front and back electrodes. Thereby, the advancing direction of a laser beam can be changed to a desired direction.

[Fourth Embodiment]
Next, a fourth embodiment will be described. In this embodiment, an example of an illumination device to which the light source device described in each of the above embodiments is applied will be described.
FIG. 5 is a schematic configuration diagram illustrating the illumination device 300 according to the present embodiment. As shown in FIG. 5, the illuminating device 300 includes the light source device 304 (laser light source 306, fluctuation mechanism 307 that fluctuates the traveling direction of laser light, a condensing lens 309, and an optical element 310) described in the above embodiments. I have.

  According to the illumination device 300 configured as described above, since the light source device 304 capable of reducing the occurrence of scintillation is provided, the illumination device 300 itself also reduces the occurrence of scintillation.

[Fifth Embodiment]
Next, a fifth embodiment will be described. In the present embodiment, an example of a monitor device on which the light source device described in each of the above embodiments is mounted will be described.
FIG. 6 is a schematic configuration diagram illustrating the monitor device 400 according to the present embodiment.
As shown in the figure, the monitor device 400 is mainly composed of a device main body 410 and an optical transmission unit 420.

  The apparatus main body 410 includes a light source device 404 having the same configuration as that of the light source device described in each of the above-described embodiments, including a laser light source, a fluctuation device such as a light reflecting element, and a condenser lens, and a camera 411 (sensor unit). ) And are provided. The light transmission unit 420 is provided with light guides 421 and 422 in which a large number of optical fibers are bundled, an optical element 423, and a condenser lens 424. This optical element 423 corresponds to the optical element of the above embodiment. Therefore, in the present embodiment, the configuration including the light source device 404 and the optical element 423 corresponds to the light source device of the above embodiment.

The light guide 421 is provided between the light source device 404 and the optical element 423, and can transmit light from the light source device 404 to the optical element 423.
The light guide 422 is provided between the camera 411 and the condenser lens 424, and can transmit light from the condenser lens 424 to the camera 411.

The optical element 423 is provided on the light guide 421 side in the tip portion of the light transmission unit 420, and diffuses the laser light from the light source device 404 and emits it to the outside.
The condensing lens 424 is provided on the light guide 422 side in the distal end portion of the light transmission unit 420 and condenses light from the outside into the light guide 422.

Next, the operation of the monitor device 400 will be described by taking an example of imaging an external subject.
The light source device 404 is activated with the tip of the light transmission unit 420 facing the subject. Laser light emitted from the light source device 404 is transmitted to the optical element 423 via the light guide 421, diffused by the diffusion plate 423, and irradiated to the outside. The laser light emitted to the outside is reflected by the subject, and the reflected light enters the condenser lens 424. This laser light is condensed by the condenser lens 424 and transmitted to the camera 411 through the light guide 422. This laser light is imaged by the camera 411.

  Thus, according to this embodiment, since the light source device 404 and the optical element 423 are provided, the monitor device 400 that can reduce the occurrence of scintillation can be obtained.

1 is a diagram showing an overall configuration of a projector according to a first embodiment of the invention. The figure which shows a mode that scattered light interferes. The figure which shows the whole structure of the projector which concerns on 2nd Embodiment of this invention. The figure which shows the whole structure of the projector which concerns on 3rd Embodiment of this invention. The figure which shows the structure of the illuminating device which concerns on 4th Embodiment of this invention. The figure which shows the structure of the monitor apparatus which concerns on 5th Embodiment of this invention. The figure which shows the example of the position of interference.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 101, 201 ... Projector 2, 102, 202 ... Image display device 3, 103, 203 ... Projection lens 4, 104, 204, 304, 404 ... Light source device 6, 106, 206 ... Laser light source 7 ... Light reflection element ( 8) Control unit 107 ... Photorefractive element (variation means) 107a ... Incident surface 107b ... Light exit surface 108 ... Control unit 207 ... KTN crystal element 207a ... KTN crystal 207b ... Electrode 207c ... Electrode 208 ... Control unit 208a ... Power source 208b ... Control unit 300 ... Lighting device 400 ... Monitor device

Claims (9)

A light source that emits laser light;
Fluctuation means for changing the traveling direction of the laser beam within a predetermined angle range with respect to the emission direction of the laser beam;
Illuminating means for illuminating the predetermined area with the laser beam whose traveling direction varies by the varying means. The light source device according to claim 1, wherein the illumination unit includes a computer-generated hologram provided on an optical path of the laser light. The varying means is
A light reflecting element provided on the optical path of the laser light and capable of reflecting the laser light;
The light source device according to claim 1, further comprising: a reflection angle control unit that controls a light reflection angle of the light reflection element. The varying means is
A photorefractive element provided on the optical path of the laser light and capable of refracting the laser light;
The light source device according to claim 1, further comprising: a refraction angle control unit that controls a light refraction angle of the photorefractive element. The varying means is
An electro-optic crystal provided on the optical path of the laser beam;
Voltage applying means for applying a voltage to the electro-optic crystal;
The light source device according to claim 1, further comprising: a voltage control unit that controls a voltage applied to the electro-optic crystal.   An illumination device comprising the light source device according to any one of claims 1 to 5. The light source device according to any one of claims 1 to 5,
An optical transmission unit for transmitting light emitted from the light source device;
And a sensor unit that senses an object with the light transmitted by the light transmission unit. The light source device according to any one of claims 1 to 5,
An image display device comprising: a light modulation unit that modulates light emitted from the light source device. The light source device according to any one of claims 1 to 5,
A light modulating means for modulating light emitted from the light source device;
A projector comprising: a projection lens that projects light modulated by the light modulation means.

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