JP2011003380A - Light source device and projector - Google Patents

Abstract

An object of the present invention is to provide a light source device that enables appropriate temperature adjustment of an arc tube, simplifies the structure, and suppresses generation of noise.
A light source device according to the present invention includes a light emitting tube including a light emitting unit, a second sealing unit, and a first sealing unit, and a surrounding of the light emitting unit. A sub-reflecting surface 13a that covers a part of the first reflecting portion 13 and a extending portion 23 that covers the first sealing portion 17, a main reflecting mirror 12 that reflects the light reflected by the sub-reflecting mirror 13, The insulating sheet 14 provided between the extending portion 23 and the first sealing portion 17, the first electrode 18 disposed between the insulating sheet 14 and the extending portion 23, and the insulating sheet 14 are first. A second electrode 19 disposed on the side opposite to the side on which the electrode 18 is disposed, and the second electrode 19 is disposed to be shifted to the light emitting unit 15 side with respect to the first electrode 18 to apply a voltage. By doing so, an ionic wind is generated, and the air between the sub-reflecting surface 13a and the light emitting unit 15 can flow.
[Selection] Figure 2

Description

  The present invention relates to a light source device and a projector, and more particularly to a technology of a light source device having a reflector.

  In a lamp used as a light source of a projector, for example, a discharge lamp such as an extra-high pressure mercury lamp, a reflector (reflecting mirror) that reflects light emitted from an arc tube is used. In order to obtain a bright image efficiently with a projector, a configuration of a light source device for improving the utilization efficiency of light emitted from an arc tube has been proposed. For example, a technique has been proposed in which a sub-reflecting mirror that covers a part of the arc tube is provided separately from the reflector as the main reflecting mirror (see, for example, Patent Document 1). The light reflected by the sub-reflecting mirror passes through the arc tube, enters the main reflecting mirror, and is reflected toward the front side. This makes it possible to reduce the thickness of the light source device while efficiently making the light emitted from the arc tube proceed to the optical system that uses the light from the light source device.

Japanese Patent No. 3350003

  Lamps used in projectors need to be cooled by cooling air or the like because much of the supplied electric energy becomes heat and becomes high temperature. In the case of a configuration including a sub-reflecting mirror, it is difficult to cool a portion covered by the sub-reflecting mirror on the surface of the light emitting unit. In this case, since the heat radiation property is different between the portion covered by the sub-reflecting mirror and the other portion of the surface of the light emitting portion, there arises a problem that it is difficult to appropriately adjust the temperature of the arc tube. A portion of the arc tube that is not sufficiently cooled may cause the transparent member constituting the arc tube to be crystallized by heat and become cloudy. In order to cool the arc tube, it may be possible to provide a blower fan or a duct. However, problems such as a complicated structure and generation of noise by the blower fan occur.

  The present invention has been made in view of the above-described problems, and provides a light source device capable of appropriately adjusting the temperature of the arc tube, simplifying the structure and suppressing noise generation, and a projector having the light source device. The purpose is to do.

  In order to solve the above-described problems and achieve the object, the present invention provides an arc tube comprising: a light emitting unit that emits light; and a first sealing unit that is integrally provided on one side of the light emitting unit; A sub-reflecting surface that includes a sub-reflecting surface that covers a part of the periphery of the light-emitting unit and reflects light emitted from the light-emitting unit; and a extending part that covers the first sealing unit; and light emitted from the light-emitting unit. The main reflecting mirror that reflects the light reflected by the sub-reflecting mirror, the insulating sheet provided between the extending portion and the first sealing portion, and the first disposed between the insulating sheet and the extending portion An electrode and a second electrode arranged on the opposite side of the insulating sheet to the side on which the first electrode is arranged, and the second electrode is arranged so as to be shifted to the light emitting part side from the first electrode The ion wind is generated by applying a voltage between the first electrode and the second electrode, and the air between the sub-reflection surface and the light emitting part can flow. To.

  Since the air between the sub-reflecting surface and the light-emitting portion can be flowed by the ion wind, the light-emitting portion that is the portion covered by the sub-reflecting mirror in the arc tube can be effectively cooled. Thereby, appropriate temperature control of the arc tube becomes possible. Moreover, since a voltage should just be applied between a 1st electrode and a 2nd electrode, a light emission part can be cooled, without using a ventilation fan or a duct. Thereby, simplification of a structure and generation | occurrence | production of noise can be suppressed. The ion wind is a wind generated by creeping discharge generated when a predetermined voltage is applied between the first electrode and the second electrode arranged so as to sandwich the insulating sheet. When a predetermined voltage is applied between the first electrode and the second electrode, air molecules are ionized around the first electrode and move toward the second electrode. The wind generated by the movement of the ionized air is called ion wind.

  Further, creeping discharge is likely to occur even with an electrode having a sharp tip as compared with corona discharge, and air may be ionized in a wide range. For example, even with a flat electrode at the tip, air may be ionized around substantially the entire area of the flat portion, and a stronger ion wind can be generated. Therefore, the air between the light emitting part and the sub-reflecting surface can be largely flowed to cool the light emitting part more effectively.

  Further, creeping discharge can be generated even when an AC voltage is applied, so that even when an AC voltage is supplied from a power source, an ion wind can be generated without using a voltage converting component. . Therefore, it is possible to reduce costs by reducing the number of components that convert voltage. In addition, since there is an insulating sheet between the first electrode and the second electrode, it is difficult for sparks to occur between the two electrodes. Thereby, the destruction of the electrode due to sparks and the influence on other electronic devices can be suppressed.

  Moreover, as a preferable aspect of the present invention, it is desirable that the extending portion, the first electrode, and the second electrode are formed in a cylindrical shape surrounding substantially the entire circumference of the first sealing portion. Since the ionic wind can be generated from substantially the entire circumference of the first sealing portion, the air around the entire light emitting portion can be flowed to cool the light emitting portion more effectively.

  The projector according to the aspect of the invention includes the light source device, a voltage application unit that applies an AC voltage between the first electrode and the second electrode, and spatial light that modulates light emitted from the light source device according to an image signal. And a modulation device. By using the light source device, it is possible to obtain a projector that can effectively cool the light emitting unit while suppressing the complexity of the structure and the generation of noise. In addition, since it is difficult for a spark to occur between the first electrode and the second electrode, it is possible to suppress the destruction of the electrode due to the spark and the influence on other electronic devices, and the projector can be stably operated. be able to.

1 is an external perspective view showing a schematic configuration of a light source device according to Embodiment 1 of the present invention. The disassembled perspective view of a light source device. The cross-sectional view of a light source device. The perspective view of the sub-reflecting mirror with which the light source device which concerns on the modification 1 of Example 1 is equipped, an insulating sheet, the 1st electrode for cooling, and the 2nd electrode for cooling. FIG. 6 is a diagram illustrating a schematic configuration of a projector according to a second embodiment of the invention.

  Embodiments of the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is an external perspective view showing a schematic configuration of a light source device 202 according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of the light source device 202 shown in FIG. FIG. 3 is a cross-sectional view of the light source device 202 shown in FIG. The light source device 202 includes an arc tube 11, a main reflecting mirror 12, a sub-reflecting mirror 13, an insulating sheet 14, a first cooling electrode (first electrode) 18, and a second cooling electrode (second electrode) 19. Composed. The light source device 202 emits light including red (R) light, green (G) light, and blue (B) light. In the description of the embodiments of the present application, the X axis is an axis orthogonal to the central axis AX of the arc tube 11. The Y axis is an axis orthogonal to the central axis AX and the X axis. The Z axis is an axis parallel to the central axis AX. The direction of the arrow on the Z axis represents the direction from the light source device 202 toward the irradiated surface (not shown). The arrow direction of each axis is a positive direction, and the opposite direction is a negative direction. A positive direction side (side with the irradiated surface) along the Z axis with respect to the light source device 202 is referred to as a front side, and a negative direction side is referred to as a rear side. A positive direction side along the Y axis with respect to the light source device 202 is referred to as an upper side, and a negative direction side is referred to as a lower side.

  The arc tube 11 is, for example, an ultra high pressure mercury lamp. The arc tube 11 includes a light emitting portion 15 having a substantially spherical shape. Light is emitted from the light emitting unit 15 by forming an arc between the arc electrodes 3 and 4 inside the light emitting unit 15. The light emitting unit 15 is integrally provided with a second sealing unit 16 and a first sealing unit 17. The first sealing portion 17 has a cylindrical shape and is provided on one side (rear side) of the light emitting portion 15. The second sealing portion 16 has a cylindrical shape and is provided on the other side (front side) of the light emitting portion 15. With the above configuration, the arc tube 11 has a shape in which the light emitting part 15 is sandwiched between the second sealing part 16 and the first sealing part 17.

  The main reflecting mirror 12 includes a main reflecting surface 12 a that reflects light emitted from the light emitting unit 15. The main reflecting mirror 12 reflects the light emitted from the light emitting unit 15 by the main reflecting surface 12a and advances it to the front side. The main reflecting surface 12a has substantially the same shape as a curved surface obtained by cutting a spheroidal surface obtained by rotating an ellipse about the central axis AX along a predetermined plane. In the present embodiment, the predetermined plane is a plane including the central axis AX of the arc tube 11. The predetermined plane may be a plane other than the plane including the central axis AX in order to increase the light use efficiency. The predetermined plane may be, for example, a plane parallel to the center axis AX or a plane having an angle with respect to the center axis AX.

  The main reflecting mirror 12 is configured by vapor-depositing a highly reflective member such as a dielectric multilayer film or a metal member on the surface of a base material formed into a desired shape. As the highly reflective member, a member having a high reflectance with respect to light having a wavelength in the visible region is used. By using the main reflecting mirror 12 including the main reflecting surface 12a having a shape obtained by cutting the spheroid, the light source device 202 can be made thinner than a light source device using a reflecting mirror whose spheroid is not cut. it can. The main reflecting surface 12a is not limited to the substantially same shape as the curved surface obtained by cutting the spheroid. For example, the shape may be substantially the same as a curved surface obtained by cutting a rotating curved surface obtained by rotating a predetermined curve such as a parabola, or a free curved surface shape.

  The sub-reflecting mirror 13 includes a sub-reflecting surface 13 a that reflects the light emitted from the light emitting unit 15. The sub-reflecting mirror 13 reflects the light emitted from the light emitting unit 15 toward the light emitting unit 15 at the sub reflecting surface 13a. The light reflected by the sub-reflecting surface 13a enters the main reflecting surface 12a, is reflected by the main reflecting surface 12a, and travels forward. The sub-reflection surface 13a covers a part of the periphery of the light emitting unit 15 from below. A gap is provided between the sub-reflecting mirror 13 and the light emitting unit 15. The sub-reflecting mirror 13 is configured by vapor-depositing a highly reflective member such as a dielectric multilayer film or a metal member on the surface of a base material formed into a desired shape. As the highly reflective member, a member having a high reflectance with respect to light having a wavelength in the visible region is used. By providing the main reflecting mirror 12 and the sub reflecting mirror 13, the light emitted from the light emitting unit 15 can be efficiently advanced to the front side.

  The sub-reflecting mirror 13 includes an extending portion 23 that covers a part of the first sealing portion 17 on the rear side portion. The extension part 23 is bonded to the fixing part 27, whereby the sub-reflecting mirror 13 in the light source device 202 is positioned and fixed. The fixing portion 27 is for fixing the arc tube 11, the main reflecting mirror 12, and the sub-reflecting mirror 13 together.

  The insulating sheet 14 is formed by forming an insulating material into a sheet shape, and is disposed between the first sealing portion 17 and the extending portion 23. The insulating sheet 14 is disposed along the surface of the extending portion 23 on the first sealing portion 17 side. The first cooling electrode 18 and the second cooling electrode 19 are arranged so that the insulating sheet is sandwiched between the electrodes 18 and 19. The first cooling electrode 18 and the second cooling electrode 19 are for causing an ion wind by creeping discharge by applying a voltage between the electrodes 18 and 19.

  The first cooling electrode 18 is formed by bending a plate-like metal member having a rectangular shape in plan view in accordance with the shape of the extending portion 23. The first cooling electrode 18 is disposed on one surface side of the insulating sheet 14. The first cooling electrode 18 is disposed between the insulating sheet 14 and the extending portion 23 and in the vicinity of the sub-reflecting surface 13a.

  The second cooling electrode 19 is formed of a metal member and includes a discharge portion 19c having a rectangular shape in plan view at the tip. The second cooling electrode 19 is disposed such that the discharge portion 19c portion is located on the opposite side of the one surface where the first cooling electrode 18 is disposed with respect to the insulating sheet 14. Further, the second cooling electrode 19 is disposed such that the discharge portion 19 c is shifted to the rear side of the first cooling electrode 18. With this arrangement, the first cooling electrode 18 is arranged at a position shifted from the discharge part 19 c of the second cooling electrode 19 toward the light emitting part 15.

  The first cooling electrode 18 and the second cooling electrode 19 are connected to a voltage application unit (not shown), and a voltage is applied between the electrodes 18 and 19 by the voltage application unit, whereby creeping discharge occurs between the electrodes 18 and 19. Can be caused. By creeping discharge, air molecules ionized in the vicinity of the discharge portion 19c of the second cooling electrode 19 are attracted to the first cooling electrode 18 side and move on the insulating sheet 14. The ionized air molecules collide with other air molecules when moving, thereby generating a so-called ion wind from the second cooling electrode 19 toward the first cooling electrode 18. The voltage applied between the electrodes 18 and 19 is preferably an alternating voltage.

  By generating an ion wind on the insulating sheet 14, an air flow along the arrow Z can be caused to flow between the light emitting unit 15 and the sub-reflecting surface 13 a. As a result, it is possible to effectively cool the portion of the arc tube 11 covered by the sub-reflecting mirror 13 and to adjust the temperature of the arc tube 11 appropriately. Further, creeping discharge is likely to occur even with an electrode having a sharp tip as compared with corona discharge, and air may be ionized in a wide range. For example, in one side of the discharge portion 19c of the second cooling electrode 19 on the first cooling electrode 18 side, air may be ionized around a substantially entire area of the one side, and a stronger ionic wind can be generated. It becomes. Therefore, the air between the light emitting unit 15 and the sub-reflecting surface 13a can be largely flowed to cool the light emitting unit 15 more effectively.

  Further, since air between the light emitting unit 15 and the sub-reflecting surface 13a can be flowed without providing a blower fan or a duct, it is possible to make the structure complicated and noise problems less likely to occur. Further, since the ion wind can be generated near the portion where the air is desired to flow, that is, between the light emitting portion 15 and the sub-reflecting surface 13a, effective cooling can be performed with a small amount of air.

  In addition, since the insulating sheet 14 is provided between the first cooling electrode 18 and the second cooling electrode 19, it is difficult for sparks to occur between the electrodes 18 and 19. Thereby, the destruction of the electrode due to sparks and the influence on other electronic devices can be suppressed.

  FIG. 4 is a perspective view of the sub-reflecting mirror 13, the insulating sheet 14, the first cooling electrode 18, and the second cooling electrode 19 included in the light source device according to the first modification of the first embodiment. In the first modification, the extending portion 23 of the sub-reflecting mirror 13 is formed in a cylindrical shape and surrounds the substantially entire circumference of the first sealing portion 17 of the arc tube 11. The insulating sheet 14 is also formed in a cylindrical shape so as to be disposed along the inner wall of the cylindrical extending portion 23, and surrounds substantially the entire circumference of the first sealing portion 17. The first cooling electrode 18 is also formed in a cylindrical shape, and the discharge portion 19 c of the second cooling electrode 19 is also formed in a cylindrical shape, and surrounds the substantially entire circumference of the first sealing portion 17.

  When these are combined, the extending portion 23, the first cooling electrode 18, the insulating sheet 14, and the second cooling electrode 19 overlap in this order from the outer peripheral direction. Further, the first cooling electrode 18 is disposed at a position shifted to the light emitting part side with respect to the discharge part 19 c of the second cooling electrode 19.

  When an alternating voltage is applied between the first cooling electrode 18 and the second cooling electrode 19 in such a combined state, as shown by an arrow P, the entire circumference of the first sealing portion 17 is applied. An ion wind toward the light emitting unit 15 can be generated. Therefore, not only the air between the light emitting unit 15 and the sub-reflecting surface 13a but also the air around the entire light emitting unit 15 can be flowed to cool the light emitting unit 15 more effectively.

  FIG. 5 is a diagram illustrating a schematic configuration of the projector 1 according to the second embodiment of the invention. The projector 1 is a front projection type projector that projects light onto a screen (not shown) and observes an image by observing light reflected on the screen. The projector 1 includes the light source device 202 according to the first embodiment (see also FIGS. 1 and 2). The light source device 202 emits light including red (R) light, green (G) light, and blue (B) light. A voltage application unit 30 is connected to the light source device 202. The voltage application unit 30 applies an AC voltage supplied from a power source (not shown) between the first cooling electrode 18 and the second cooling electrode 19. The voltage application unit 30 applies a voltage at which corona discharge occurs between the first cooling electrode 18 and the second cooling electrode 19 and does not cause a spark. The first cooling electrode 18 is grounded.

  The concave lens 31 collimates the light emitted from the light source device 202. The first integrator lens 32 and the second integrator lens 33 have a plurality of lens elements arranged in an array. The first integrator lens 32 divides the light flux from the concave lens 31 into a plurality of parts. Each lens element of the first integrator lens 32 condenses the light beam from the concave lens 31 in the vicinity of the lens element of the second integrator lens 33. The lens element of the second integrator lens 33 forms an image of the lens element of the first integrator lens 32 on the spatial light modulator.

  The light that has passed through the two integrator lenses 32 and 33 is converted into linearly polarized light in a specific vibration direction by the polarization conversion element 34. The superimposing lens 35 superimposes the image of each lens element of the first integrator lens 32 on the spatial light modulator. The first integrator lens 32, the second integrator lens 33, and the superimposing lens 35 make the light intensity distribution from the light source device 202 uniform on the spatial light modulator. Light from the superimposing lens 35 enters the first dichroic mirror 36. The first dichroic mirror 36 reflects R light and transmits G light and B light. The R light incident on the first dichroic mirror 36 has its optical path bent by reflection at the first dichroic mirror 36 and the reflection mirror 37, and is incident on the R light field lens 38R. The R light field lens 38R collimates the R light from the reflection mirror 37 and makes it incident on the R light spatial light modulator 39R.

  The spatial light modulator 39R for R light is a spatial light modulator that modulates R light according to an image signal, and is a transmissive liquid crystal display device. A liquid crystal panel (not shown) provided in the R light spatial light modulator 39R encloses a liquid crystal layer for modulating light according to an image signal between two transparent substrates. The R light modulated by the R light spatial light modulator 39R is incident on the cross dichroic prism 40 which is a color synthesis optical system.

  The G light and B light transmitted through the first dichroic mirror 36 enter the second dichroic mirror 41. The second dichroic mirror 41 reflects G light and transmits B light. The G light incident on the second dichroic mirror 41 has its optical path bent due to reflection by the second dichroic mirror 41, and enters the G light field lens 38G. The G light field lens 38G collimates the G light from the second dichroic mirror 41 and makes it incident on the G light spatial light modulator 39G. The G light spatial light modulation device 39G is a spatial light modulation device that modulates G light according to an image signal, and is a transmissive liquid crystal display device. The G light modulated by the G light spatial light modulator 39G is incident on a different surface of the cross dichroic prism 40 from the surface on which the R light is incident.

  The B light transmitted through the second dichroic mirror 41 is transmitted through the relay lens 42, and then the optical path is bent by reflection at the reflection mirror 43. The B light from the reflection mirror 43 further passes through the relay lens 44, and then the optical path is bent by reflection by the reflection mirror 45, and enters the B light field lens 38B. Since the optical path of the B light is longer than the optical path of the R light and the optical path of the G light, relay lenses 42 and 44 are provided in the optical path of the B light in order to make the illumination magnification in the spatial light modulator equal to that of other color lights. The relay optical system to be used is adopted.

  The B light field lens 38B collimates the B light from the reflection mirror 45 and makes it incident on the B light spatial light modulator 39B. The B light spatial light modulation device 39B is a spatial light modulation device that modulates B light according to an image signal, and is a transmissive liquid crystal display device. The B light modulated by the B light spatial light modulator 39B is incident on a surface of the cross dichroic prism 40 different from the surface on which the R light is incident and the surface on which the G light is incident.

  The cross dichroic prism 40 has two dichroic films 46 and 47 that are substantially orthogonal to each other. The first dichroic film 46 reflects R light and transmits G light and B light. The second dichroic film 47 reflects B light and transmits R light and G light. The cross dichroic prism 40 combines R light, G light, and B light incident from different directions and emits the light toward the projection lens 48. The projection lens 48 projects the light combined by the cross dichroic prism 40 toward the screen.

  By using the light source device 202 that can effectively cool the light emitting unit while suppressing the complexity of the structure and the problem of noise, the projector 1 displays a bright image stably and efficiently with a simple configuration. It becomes possible to do. Further, when the state shown in FIG. 3 is set to the upright state, if the inverted state is defined as the inverted state, when the light source device 202 is used in the inverted state, the upper side of the arc tube 11 is Covered with a sub-reflector 13. In this inverted state, heat is likely to be trapped between the light emitting unit 15 and the sub-reflecting surface 13a. However, the air between the light emitting unit and the sub-reflecting mirror is caused to flow by the ion wind, so that the light emitting unit 15 is effectively Since the projector 1 can be cooled, it is possible to stably operate the projector 1 while suppressing the occurrence of problems due to poor cooling. Further, the creeping discharge can be used by arranging the insulating sheet 14 between the first cooling electrode 18 and the second cooling electrode 19, so that the AC voltage supplied from the power source is not converted into the DC voltage. Can be applied. Therefore, it is possible to reduce costs by reducing the number of components that convert voltage.

  The projector 1 is not limited to the case where a transmissive liquid crystal display device is used as the spatial light modulation device. As the spatial light modulator, a reflective liquid crystal display (Liquid Crystal On Silicon; LCOS), DMD (Digital Micromirror Device), GLV (Grating Light Valve), or the like may be used. The projector 1 is not limited to a configuration including a spatial light modulator for each color light. The projector 1 may be configured to modulate two or three or more color lights with one spatial light modulator. The projector 1 is not limited to using a spatial light modulation device. The projector 1 may be a slide projector that uses a slide having image information.

  Further, the shapes of the first cooling electrode and the second cooling electrode are not limited to the shapes described in the above-described embodiments. The shape of the first cooling electrode and the second cooling electrode may be any shape that can generate an ion wind by creeping discharge, and various shapes can be adopted.

  As described above, the light source device according to the present invention is suitable for use in a projector.

AX Central axis, P, Z arrow, 1 projector, 202 light source device, 3, 4 arc electrode, 11 arc tube, 12 main reflecting mirror, 12a main reflecting surface, 13 sub reflecting mirror, 13a sub reflecting surface, 14 insulating sheet , 15 Light emitting part, 16 Second sealing part, 17 First sealing part, 18 First cooling electrode (first electrode), 19 Second cooling electrode (second electrode), 19c Discharge part, 23 Extending part , 27 fixing portion, 30 voltage application portion, 31 concave lens, 32 first integrator lens, 33 second integrator lens, 34 polarization conversion element, 35 superimposing lens, 36 first dichroic mirror, 37 reflection mirror, 38R R light field lens , 38G G light field lens, 38B B light field lens, 39R R light spatial light modulator, 39G G light spatial light modulation Adjusting device, 39B spatial light modulator for B light, 40 cross dichroic prism, 41 first dichroic mirror, 42 relay lens, 43 reflecting mirror, 44 relay lens, 45 reflecting mirror, 46 first dichroic film, 47 second dichroic film 48 projection lens

Claims (3)

A light emitting tube comprising: a light emitting unit that emits light; and a first sealing unit that is integrally provided on one side of the light emitting unit;
A sub-reflecting mirror comprising: a sub-reflecting surface that covers a part of the periphery of the light emitting unit and reflects light emitted from the light emitting unit; and an extending unit that covers the first sealing unit;
A main reflecting mirror that reflects the light emitted from the light emitting unit and the light reflected by the sub-reflecting mirror;
An insulating sheet provided between the extending portion and the first sealing portion;
A first electrode disposed between the insulating sheet and the extending portion;
A second electrode disposed on the side opposite to the side on which the first electrode is disposed with respect to the insulating sheet,
The second electrode is arranged so as to be shifted to the light emitting unit side with respect to the first electrode,
A light source device characterized in that an ion wind is generated by applying a voltage between the first electrode and the second electrode, and the air between the sub-reflecting surface and the light emitting unit can flow. The arc tube is
2. The light source device according to claim 1, wherein the extending portion, the first electrode, and the second electrode are formed in a cylindrical shape that surrounds substantially the entire circumference of the first sealing portion. The light source device according to claim 1 or 2,
A voltage application unit for applying an alternating voltage between the first electrode and the second electrode;
And a spatial light modulator that modulates light emitted from the light source device in accordance with an image signal.

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