JP2008146893A - Light source device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device capable of suppressing occurrence of flickering in an image projected to a projection screen by the change with the passage of time accompanying continuous use and capable of suppressing deterioration of light utilization efficiency in an illuminated region by the change with the passage of time accompanying continuous use and realizing a long life time. <P>SOLUTION: The light source device 110 is provided with a microwave generating part 10 to radiate microwave M, an arc tube 20 in which a light-emitting substance to emit light by microwave is filled, a microwave reflecting member 30 to reflect and converge the microwave M radiated from the microwave generating part 10 to the arc tube 20, an ellipsoidal reflector 40 to reflect the light from the arc tube 20 to the illuminated region side, and a secondary mirror 50 which is arranged on the illuminated region side of the arc tube 20 and reflects the light emitted from the arc tube 20 to the illuminated region side toward the arc tube 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light source device and a projector.

  2. Description of the Related Art Conventionally, as a light source device used for a projector, a light source device including a discharge lamp such as a halogen lamp, a metal halide lamp, and a high-pressure mercury lamp is known (for example, see Patent Documents 1 and 2). A conventional light source device includes an arc tube having a tube bulb portion containing a pair of electrodes and a pair of sealing portions extending on both sides of the tube bulb portion.

JP 2001-272726 A JP 2001-356212 A

  By the way, in the conventional light source device, the electrode wears or the tip of the electrode is deformed due to the secular change with continuous use, so the position of the arc spot formed between the pair of electrodes becomes unstable. As a result, there is a problem that flickering occurs in an image projected on a projection surface such as a screen. In addition, if the electrodes are worn due to secular change due to continuous use, the distance between the electrodes (arc length) becomes longer than the initial distance between the electrodes (arc length), so the light from the light source device is arranged in the latter stage of the optical path. As a result, there is a problem that the light use efficiency in the illuminated area is lowered.

Moreover, in the conventional light source device, the electrode substance which comprises an electrode may adhere to the inner wall of a bulb part, and a bulb part may become black. When the tube portion is blackened, light is absorbed at the blackened portion, so that the temperature of the tube portion rises excessively and the arc tube may be damaged. Moreover, when the temperature of a tube part rises too much by blackening, a tube part may become cloudy and devitrify. Since the tube part becomes cloudy and devitrified, light transmission is hindered, so heat is generated and the temperature of the arc tube further rises. As a result, the arc tube (tube part) bursts. End up.
That is, the conventional light source device has a problem that it is not easy to extend the life of the light source device.

  Therefore, the present invention was made to solve such a problem, it is possible to suppress the occurrence of flicker in the image projected on the projection surface due to secular change accompanying continuous use, and It is an object of the present invention to provide a light source device and a projector that can suppress a decrease in light use efficiency in an illuminated area due to secular change associated with continuous use, and can achieve a long life.

  The light source device of the present invention includes a microwave generator that emits microwaves, an arc tube in which a luminescent material that emits microwaves is enclosed, and the microwaves emitted from the microwave generator emits light. A microwave reflecting member that reflects toward the tube and focuses the light on the arc tube, a reflector that reflects light from the arc tube toward the illuminated region, and is disposed on the illuminated region side of the arc tube. And a light reflecting member that reflects light emitted from the arc tube toward the illuminated area toward the arc tube.

  In the light source device of the present invention, the microwave from the microwave generator is reflected by the microwave reflecting member and focused on the arc tube, thereby exciting and emitting the luminescent substance enclosed in the arc tube. The light source device emits an illumination light beam toward the illuminated area by reflecting light from the tube with a reflector. That is, according to the light source device of the present invention, since the arc tube can emit light without using an electrode, problems such as electrode wear and electrode tip deformation due to secular change do not occur. As a result, when the light source device of the present invention is used as a light source of a projector, it is possible to suppress the occurrence of flickering in the image projected on the projection surface due to secular change accompanying continuous use, and continuous use. It is possible to suppress a decrease in light use efficiency in the illuminated area due to the secular change accompanying the.

  Further, according to the light source device of the present invention, since the electrode is not used, the tube portion is not blackened, and the tube portion is not clouded (devitrified) due to precipitation of impurities from the electrode. It is possible to prevent the arc tube from being damaged due to blackening or white turbidity (devitrification) of the tube bulb. As a result, the life of the light source device can be extended.

  Further, according to the light source device of the present invention, the light emitted from the arc tube to the illuminated area side is reflected by the light reflecting member toward the arc tube, so that it is emitted from the arc tube to the illuminated area side and is effectively effective. It is possible to effectively use the light that has not been used for the light. As a result, the brightness of the light source device can be increased.

  In addition, according to the light source device of the present invention, since the above-described light reflecting member is provided, it is necessary to set the size of the reflector so as to reflect all of the light emitted from the arc tube. Therefore, the reflector can be reduced in size, and as a result, a compact light source device can be realized.

  Further, according to the light source device of the present invention, since no electrode is present inside the arc tube, light reflected by the light reflecting member and incident on the arc tube is not blocked by the electrode.

When a discharge lamp such as a high-pressure mercury lamp is used, since the internal pressure of the bulb reaches 150 to 200 at the time of lighting, the arc tube (tube) breaks at the end of the lamp life. May end up. For this reason, in the conventional light source device, it is necessary to devise an explosion-proof structure such as providing an explosion-proof glass so that glass fragments and inclusions such as mercury are not scattered when the arc tube is ruptured.
On the other hand, according to the light source device of the present invention, since the internal pressure of the arc tube does not require a high atmospheric pressure like a high-pressure mercury lamp, the arc tube does not burst at the end of the lamp life. As a result, it is not necessary to devise an explosion-proof structure.

  In the light source device of the present invention, the light reflecting member may be a secondary mirror disposed in close contact with the outer surface of the arc tube so as to cover the outer surface of the arc tube on the illuminated area side. preferable.

  With this configuration, it is possible to reflect the light emitted from the arc tube toward the illuminated region by the sub mirror toward the arc tube.

  The light source device of the present invention further includes a support member disposed between the arc tube and the light reflecting member, and the light reflecting member covers an outer surface of the arc tube on the illuminated area side. The secondary mirror is preferably disposed on the arc tube via the support member.

  With this configuration, it is possible to reflect the light emitted from the arc tube toward the illuminated region by the sub mirror toward the arc tube. In addition, since the space is formed between the arc tube and the sub mirror, the arc tube can be effectively cooled, and the life of the light source device can be further extended. It becomes possible.

  In the light source device of the present invention, the light reflecting member is preferably a reflective film formed on the outer surface of the arc tube so as to cover the outer surface of the arc tube on the illuminated area side.

  With this configuration, the light emitted from the arc tube to the illuminated region side can be reflected toward the arc tube by the reflective film.

  In the light source device of the present invention, it is preferable that a lens that emits light from the arc tube toward the illuminated region side is disposed at a central portion of the light reflecting member.

  When the above lens is not arranged in the central portion of the light reflecting member, the light emitted from the arc tube toward the central portion of the light reflecting member is a light beam including the optical axis of the light source device. It only goes back and forth between the secondary mirror and the reflector on the optical axis of the light source device, and cannot be used effectively. On the other hand, according to the light source device of the present invention, it is possible to emit light emitted from the arc tube toward the central portion of the light reflecting member toward the illuminated region side by the lens, Such light can be used effectively, and light use efficiency can be improved.

  In addition, the center part of a light reflection member means the area | region of a fixed range including the part through which the optical axis of a light source device passes among light reflection members.

  The light source device of the present invention further includes a light source case that houses the microwave generation unit, the arc tube, the microwave reflection member, the reflector, and the light reflection member, and the light source case shields the microwave. It preferably has a function.

  With this configuration, microwaves can be prevented from leaking outside the light source device, so that the light source device does not adversely affect the human body, peripheral electronic devices, and the like.

  The projector of the present invention includes the light source device of the present invention, a liquid crystal device that modulates an illumination light beam from the light source device according to image information, and a projection optical system that projects light modulated by the liquid crystal device. It is characterized by.

  Therefore, according to the projector of the present invention, it is possible to suppress the occurrence of flickering in the image projected on the projection surface due to secular change accompanying continuous use, and to be illuminated by secular change accompanying continuous use. It is possible to suppress a decrease in light use efficiency in the region, and it is an excellent projector including a light source device capable of extending the life.

  Hereinafter, a light source device and a projector according to the present invention will be described based on embodiments shown in the drawings.

[Embodiment 1]
<Configuration of projector>
First, the configuration of the projector 1000 according to the first embodiment will be described with reference to FIG.
FIG. 1 is a diagram illustrating an optical system of a projector 1000 according to the first embodiment. FIG. 1A is a diagram illustrating an optical system when the projector 1000 is viewed from above, and FIG. 1B is a diagram illustrating the optical system when the projector 1000 is viewed from the side.

  In the following description, three directions orthogonal to each other are defined as a z-axis direction (the optical axis OC direction of the illumination device 100 in FIG. 1A) and an x-axis direction (parallel to the paper surface in FIG. 1A). A direction perpendicular to the z-axis) and a y-axis direction (direction perpendicular to the paper surface in FIG. 1A and perpendicular to the z-axis).

  As shown in FIG. 1, the projector 1000 according to the first embodiment separates the illumination device 100 and the illumination light flux from the illumination device 100 into three color lights of red light, green light, and blue light and guides them to the illumination area. The three color liquid crystal devices 400R, 400G, and 400B as electro-optic modulation devices that modulate the light-separated color separation light guide optical system 200 and the three color lights separated by the color separation light guide optical system 200 according to image information. And a cross dichroic prism 500 that combines the color lights modulated by the three liquid crystal devices 400R, 400G, and 400B, and a projection optical system 600 that projects the light combined by the cross dichroic prism 500 onto a projection surface such as a screen SCR. It is a projector provided.

The illuminating device 100 includes a light source device 110 that emits an illumination light beam toward the illuminated area side, and a first plurality of first small lenses 162 that divide the illumination light beam emitted from the light source device 110 into a plurality of partial light beams. The lens array 160, the second lens array 170 having a plurality of second small lenses 172 corresponding to the plurality of first small lenses 162 of the first lens array 160, and the polarization directions of the partial light beams from the second lens array 170 A polarization conversion element 180 that converts the light into substantially one type of linearly polarized light and emits it, and a superimposing lens 190 that superimposes each partial light beam emitted from the polarization conversion element 180 in the illuminated area.
The configuration of the light source device 110 will be described later.

  The first lens array 160 has a function as a light beam splitting optical element that splits light from the light source device 110 into a plurality of partial light beams, and a plurality of first small lenses 162 are arranged in a plane orthogonal to the optical axis OC. It has a configuration arranged in a matrix of rows and columns. Although not illustrated, the outer shape of the first small lens 162 is similar to the outer shape of the image forming area of the liquid crystal devices 400R, 400G, and 400B.

  The second lens array 170 has a function of forming the images of the first small lenses 162 of the first lens array 160 in the vicinity of the image forming regions of the liquid crystal devices 400R, 400G, and 400B together with the superimposing lens 190. The second lens array 170 has substantially the same configuration as the first lens array 160, and a plurality of second small lenses 172 are arranged in a matrix of a plurality of rows and a plurality of columns in a plane orthogonal to the optical axis OC. It has a configuration.

The polarization conversion element 180 is a polarization conversion element that emits the polarization direction of each of the partial light beams divided by the first lens array 160 as approximately one type of linearly polarized light having a uniform polarization direction.
The polarization conversion element 180 transmits light having one polarization component (for example, P polarization component) out of the illumination light beam from the light source device 110, and transmits light having the other polarization component (for example, S polarization component) perpendicular to the optical axis OC. A polarization separation layer that reflects in one direction, a reflection layer that reflects light having the other polarization component (S polarization component) reflected by the polarization separation layer in a direction parallel to the optical axis OC, and the polarization separation layer that is transmitted A retardation plate that converts light having one polarization component (P polarization component) into light having the other polarization component (S polarization component).

  The superimposing lens 190 condenses a plurality of partial light beams that have passed through the first lens array 160, the second lens array 170, and the polarization conversion element 180, and superimposes them on the vicinity of the image forming regions of the liquid crystal devices 400R, 400G, and 400B. It is an element. The superimposing lens 190 is arranged so that the optical axis of the superimposing lens 190 and the optical axis OC of the illumination device 100 substantially coincide. The superimposing lens 190 may be composed of a compound lens in which a plurality of lenses are combined.

  The color separation light guide optical system 200 includes dichroic mirrors 210 and 220, reflection mirrors 230, 240 and 250, an incident side lens 260, and a relay lens 270. The color separation light guide optical system 200 separates the illumination light beam emitted from the superimposing lens 190 into three color lights of red light, green light, and blue light, and the three liquid crystal devices 400R that are the objects of illumination. , 400G, 400B.

  The dichroic mirrors 210 and 220 are optical elements on which a wavelength selection film that reflects a light beam in a predetermined wavelength region and transmits a light beam in another wavelength region is formed on a substrate. The dichroic mirror 210 disposed in the front stage of the optical path is a mirror that reflects a red light component and transmits other color light components. The dichroic mirror 220 disposed in the latter stage of the optical path is a mirror that transmits the blue light component and reflects the green light component.

  The red light component reflected by the dichroic mirror 210 is bent by the reflection mirror 230 and enters the image forming area of the liquid crystal device 400R for red light through the condenser lens 300R. The condenser lens 300R is provided to convert each partial light beam from the superimposing lens 150 into a light beam substantially parallel to each principal ray. The other condenser lenses 300G and 300B are configured in the same manner as the condenser lens 300R.

  Of the green light component and the blue light component that have passed through the dichroic mirror 210, the green light component is reflected by the dichroic mirror 220, passes through the condenser lens 300G, and enters the image forming region of the green light liquid crystal device 400G. On the other hand, the blue light component is transmitted through the dichroic mirror 220, passes through the incident side lens 260, the incident side reflection mirror 240, the relay lens 270, the emission side reflection mirror 250, and the condensing lens 300B, and is a liquid crystal for blue light. The light enters the image forming area of the apparatus 400B. The incident side lens 260, the relay lens 270, and the reflection mirrors 240 and 250 have a function of guiding the blue light component transmitted through the dichroic mirror 220 to the liquid crystal device 400B.

  The reason that the incident side lens 260, the relay lens 270, and the reflection mirrors 240 and 250 are provided in the optical path of blue light is that the length of the optical path of blue light is longer than the length of the optical paths of other color lights. For this reason, a decrease in light use efficiency due to light divergence or the like is prevented. The projector 1000 according to Embodiment 1 has such a configuration because the length of the optical path of blue light is long. However, the length of the optical path of red light is increased, and the incident side lens 260 and the relay lens 270 are configured. And the structure which uses the reflective mirrors 240 and 250 for the optical path of red light is also considered.

The liquid crystal devices 400 </ b> R, 400 </ b> G, and 400 </ b> B modulate the illumination light beam according to the image information and are the illumination target of the illumination device 100.
The liquid crystal devices 400R, 400G, and 400B are a pair of transparent glass substrates in which a liquid crystal that is an electro-optical material is hermetically sealed. For example, an incident light that will be described later is used according to given image information using a polysilicon TFT as a switching element. Modulates the polarization direction of one type of linearly polarized light emitted from the side polarizing plate.

  Condensing lenses 300R, 300G, and 300B are disposed in the front stage of the optical path of the liquid crystal devices 400R, 400G, and 400B.

  Although not shown here, incident-side polarizing plates are interposed between the condenser lenses 300R, 300G, and 300B and the liquid crystal devices 400R, 400G, and 400B, and the liquid crystal devices 400R, 400G, and 400B are disposed. Between the 400B and the cross dichroic prism 500, an exit side polarizing plate is interposed. The incident-side polarizing plate, the liquid crystal devices 400R, 400G, and 400B and the exit-side polarizing plate modulate light of each color light incident thereon.

  The cross dichroic prism 500 is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from the exit side polarizing plate. The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and a dielectric multilayer film is formed on the substantially X-shaped interface in which the right-angle prisms are bonded together. The dielectric multilayer film formed at one of the substantially X-shaped interfaces reflects red light, and the dielectric multilayer film formed at the other interface reflects blue light. By these dielectric multilayer films, the red light and the blue light are bent and aligned with the traveling direction of the green light, so that the three color lights are synthesized.

  The color image emitted from the cross dichroic prism 500 is enlarged and projected by the projection optical system 600 to form a large screen image on the screen SCR.

<Configuration of light source device>
Next, the configuration of the light source device 110 according to the first embodiment will be described with reference to FIG.
FIG. 2 is a diagram for explaining the light source device 110 according to the first embodiment. FIG. 2A is a schematic diagram illustrating a configuration of the light source device 110, and FIG. 2A is a schematic diagram illustrating a state in which light L is emitted from the light source device 110.

  As illustrated in FIG. 2, the light source device 110 according to the first embodiment includes a microwave generation unit 10 that radiates a microwave M, an arc tube 20 in which a luminescent material that emits microwaves is enclosed, and a microwave. A microwave reflecting member 30 that reflects and focuses the microwave radiated from the generator 10 toward the arc tube 20, and an elliptical reflector as a reflector that reflects the light from the arc tube 20 toward the illuminated region. 40, a secondary mirror 50 as a light reflecting member disposed on the illuminated region side of the arc tube 20, a reflector side support member 60 disposed between the arc tube 20 and the ellipsoidal reflector 40, and the arc tube 20 The secondary mirror side support member 62 disposed between the secondary mirror 50 and the secondary mirror 50, a concave lens 70 that emits the focused light from the ellipsoidal reflector 40 as substantially parallel light, and a light source case 80. . The light source device 110 emits a light beam having the optical axis OC of the illumination device 100 as a central axis.

  The microwave generator 10 is disposed on the lower side (y-axis (−) side) of the ellipsoidal reflector 40. The microwave M radiated from the microwave generator 10 is, for example, a substantially plane wave. The configuration of the microwave generation unit 10 will be described later.

  The arc tube 20 has a hollow, substantially spherical shape, and is an electrodeless arc tube. The arc tube 20 is preferably made of a material having transparency and heat resistance such as quartz glass, sapphire, and translucent ceramic. The arc tube 20 is filled with a luminescent material that is excited by microwaves and emits plasma. As the luminescent material to be filled, for example, a rare gas such as neon, argon, krypton, xenon, halogen or the like is preferable. Moreover, you may enclose metals or metal compounds, such as mercury and sodium, with these noble gases. Furthermore, the luminescent material may be a solid.

  The microwave reflecting member 30 is made of, for example, a metal member that is a conductive material, and is disposed on the upper side (y-axis (+) side) of the ellipsoidal reflector 40. The microwave reflecting member 30 includes a microwave reflecting surface 32 that reflects and focuses the microwave M emitted from the microwave generating unit 10 toward the arc tube 20. The microwave reflecting surface 32 has a paraboloid shape, for example, and is configured such that the central portion of the arc tube 20 is substantially in the focal position.

  The ellipsoidal reflector 40 has a light reflecting surface 42 that reflects the light from the arc tube 20 toward the second focal position, and the back surface side (z axis (−)) of the arc tube 20 via the reflector side support member 60. Side). The light reflecting surface 42 has a function of transmitting the microwave M from the microwave generator 10 and reflecting the light L from the arc tube 20.

For example, crystallized glass, alumina (Al ₂ O ₃ ), or the like can be suitably used as the material of the base material that constitutes the ellipsoidal reflector 40. The light reflecting surface 42 is, for example, a light reflecting surface formed of a dielectric multilayer film of titanium oxide (TiO ₂ ) and silicon oxide (SiO ₂ ).

  The secondary mirror 50 is a light reflecting member that covers approximately half of the arc tube 20 and is disposed to face the light reflecting surface 42 of the elliptical reflector 40. The secondary mirror 50 has a light reflecting surface 52 that reflects the light emitted from the arc tube 20 toward the illuminated region toward the arc tube 20, and the secondary mirror 50 supports the arc tube 20 via the secondary mirror side support member 62. It is arranged on the front side (z axis (+) side). The light reflected by the light reflecting surface 52 of the secondary mirror 50 passes through the arc tube 20 and enters the elliptical reflector 40.

As a material constituting the secondary mirror 50, for example, translucent alumina or the like can be suitably used. Thereby, the heat dissipation in the secondary mirror 50 can be improved. In addition to alumina, materials such as quartz glass, sapphire, and ruby may be used. The light reflecting surface 52 is a light reflecting surface made of a dielectric multilayer film of tantalum oxide (Ta ₂ O ₅ ) and silicon oxide (SiO ₂ ), for example.

  The reflector-side support member 60 is a support member whose one end supports and fixes the arc tube 20 and whose other end supports and fixes the elliptical reflector 40. The secondary mirror side support member 62 is a support member whose one end supports and fixes the arc tube 20 and whose other end supports and fixes the secondary mirror 50. The reflector side support member 60 and the secondary mirror side support member 62 are made of a material that transmits microwaves and light (visible light).

  The concave lens 70 is disposed on the illuminated area side of the ellipsoidal reflector 40. Then, the light from the ellipsoidal reflector 40 is emitted toward the first lens array 160.

  The light source case 80 is made of, for example, a metal member that is a conductive material, and has a function of shielding microwaves. The light source case 80 houses the microwave generation unit 10, the arc tube 20, the microwave reflection member 30, the ellipsoidal reflector 40, and the secondary mirror 50.

  In addition, although description by illustration is abbreviate | omitted here, in the area | region through which the light from the ellipsoidal reflector 40 passes among the light source cases 80, the member which has a high light transmittance and has a function which shields a microwave is arrange | positioned. Has been. For example, a metal mesh member having a plurality of holes is arranged in a region where light from the ellipsoidal reflector 40 in the light source case 80 passes. The diameter of the hole is set to ¼ or less of the wavelength of the microwave radiated from the microwave generator 10.

<Configuration of microwave generator>
Next, the configuration of the microwave generation unit 10 will be described with reference to FIG.
FIG. 3 is a block diagram illustrating a configuration of the microwave generation unit 10.

  As shown in FIG. 3, the microwave generation unit 10 includes a solid-state high-frequency oscillation unit 700 that outputs a high-frequency signal, and a waveguide unit 760 that radiates the high-frequency signal output from the solid-state high-frequency oscillation unit 700 as a microwave. .

The solid-state high-frequency oscillator 700 includes a diamond SAW oscillator 710 as a surface acoustic wave (SAW) oscillator, a first amplifier 720 as an amplifier, and a power source that supplies power to the diamond SAW oscillator 710 and the first amplifier 720. 730. The subsequent stage of the diamond SAW oscillator 710 is connected to the previous stage of the first amplifier 720.
The configuration of the diamond SAW oscillator 710 will be described later.

  The high frequency signal output from the diamond SAW oscillator 710 is amplified by the first amplifier 720 and then output to the waveguide unit 760. The high-frequency signal output from the first amplifier 720 becomes the high-frequency signal output from the solid-state high-frequency oscillator 700. In the projector 1000 according to the first embodiment, a high-frequency signal in the 2.45 GHz band, for example, is output from the solid-state high-frequency oscillation unit 700. The high-frequency signal in the 2.45 GHz band is a high-frequency output level at which the luminescent material in the arc tube 20 can be excited to emit light.

  The waveguide unit 760 guides a high-frequency signal output from the solid-state high-frequency oscillation unit 700 and radiates it as a microwave, and includes an antenna 762 that radiates the microwave and an isolator 764 as a safety device.

The antenna 762 is, for example, a patch antenna, and is a planar antenna that radiates microwaves having unidirectionality. The antenna 762 can radiate a microwave M composed of a substantially plane wave.
In the projector 1000 according to the first embodiment, the number of antennas is one, but a plurality of antennas may be used according to the microwave output level, the radiation range, and the like.

  The isolator 764 prevents the reflected wave of the microwave from the microwave reflection member 30 and the light source case 80 (see FIG. 2) from returning to the solid-state high-frequency oscillation unit 700, and prevents a failure of the first amplifier 720 and the like. It is a safety device for.

<Configuration of diamond SAW oscillator>
Next, the configuration of the diamond SAW oscillator 710 will be described with reference to FIGS.
FIG. 4 is a block diagram showing the configuration of the diamond SAW oscillator 710. FIG. 5 is a cross-sectional view showing the structure of the diamond SAW resonator 740. FIG. 6 is a diagram showing the relationship between the frequency and intensity of the signal output from the diamond SAW oscillator 710. In FIG. 6, the horizontal axis represents frequency and the vertical axis represents intensity.

  The diamond SAW oscillator 710 includes a phase shift circuit 712, a diamond SAW resonator 740 as a surface acoustic wave resonator, a second amplifier 714, a power distributor 716, a loop circuit 718, and an output side of the power distributor 716. And a buffer circuit 719 connected to each other. The loop circuit 718 includes a phase shift circuit 712, a diamond SAW resonator 740, a second amplifier 714, and a power distributor 716. The phase shift circuit 712 has a function of changing the phase of the loop circuit 718 by inputting a control voltage from the power supply 730. These blocks constituting the diamond SAW oscillator 710 are all matched and connected to a constant characteristic impedance, for example, 50 ohms. The diamond SAW resonator 740 can be connected to the input side of the second amplifier 714 so that an input voltage at which the second amplifier 714 is saturated is supplied.

  As a result, a high frequency signal in the GHz band can be directly oscillated using the diamond SAW resonator 740. In addition, the output power of the second amplifier 714 can be output from the power distributor 716 to the outside via the buffer circuit 719 while maintaining matching. In addition, with the circuit configuration described above, it is possible to continue the continuous oscillation state while minimizing the power applied to the diamond SAW resonator 740. In addition, the phase shift circuit 712 can apply frequency modulation to the high-frequency signal, and can radiate the microwave intermittently or continuously to the microwave reflecting member 30. In the projector 1000 according to the first embodiment, the diamond SAW resonator 740 outputs a high-frequency signal in the 2.45 GHz band.

  As shown in FIG. 5, the diamond SAW resonator 740 has a structure in which a diamond single crystal layer 744, a thin film piezoelectric layer 746, and a silicon oxide film 748 are stacked in this order on a top surface based on a silicon substrate 742. . Between the thin film piezoelectric layer 746 and the silicon oxide film 748, an IDT (Inter Digital Transducer) electrode 750 for exciting a surface acoustic wave is provided and a reflector electrode (not shown) for reflecting the surface acoustic wave. Is provided. The IDT electrode 750 is composed of a pair of comb electrodes arranged so as to mesh with each other.

  The diamond single crystal layer 744 is formed by, for example, a vapor phase synthesis method. Note that a hard carbon film having an elastic constant close to that of polycrystalline diamond may be used.

The thin film piezoelectric layer 746 is made of, for example, a thin film of zinc oxide (ZnO). In addition to zinc oxide (ZnO), aluminum nitride (AlN), lead oxide (PbO ₂ ), zirconium oxide (ZrO ₂ ), titanium oxide (TiO ₂ ), or the like may be used. The thin film piezoelectric layer 746 is formed by, for example, a sputtering method or a vapor phase synthesis method.

  Since the silicon oxide film 748 has a temperature dependency of the operating frequency opposite to that of the diamond single crystal layer 744, the thin film piezoelectric layer 746, and the IDT electrode 750, the diamond SAW resonance in which the silicon oxide film 748 is laminated is used. The child 740 can improve the temperature characteristics of the operating frequency.

  As described above, the diamond SAW resonator 740 serving as the surface acoustic wave resonator has a laminated structure, and is manufactured by using a microfabrication technique in semiconductor manufacturing to form a chip. In other words, the solid-state high-frequency oscillator 700 having the diamond SAW oscillator 710 is mounted with the diamond SAW resonator 740 formed in a chip and other elements. Therefore, the solid high-frequency oscillator 700 is small in size.

The diamond SAW resonator 740 configured as described above outputs only a high-frequency signal having a specific frequency f ₁ (2.45 GHz band) from the diamond SAW oscillator 710 as shown in FIG.

<Circuit configuration of projector>
Next, the circuit configuration of the projector 1000 according to the first embodiment will be described with reference to FIG.
FIG. 7 is a circuit block diagram of the projector 1000 according to the first embodiment. In FIG. 7, in order to explain the circuit configuration of the projector 1000, some optical systems are not shown.

  As shown in FIG. 7, the projector 1000 according to the first embodiment is connected to an image input terminal 812, a signal conversion unit 810 that performs AD conversion on an analog image signal input from the image input terminal 812, and a signal conversion unit 810. An image processing unit 820 that performs predetermined image processing on the output digital image signal, a liquid crystal device driving unit 830 that drives the liquid crystal devices 400R, 400G, and 400B based on the image signal output from the image processing unit 820, and a user An operation receiving unit 840 that receives an operation input by the computer, a storage unit 850, a fan drive unit 860 that drives the fan 862, a power supply unit 870, and a control unit 800 that controls these blocks. These blocks are connected to each other by a bus line B.

  An image input terminal 812 and an operation unit 842 are installed on the outer surface of the projector 1000. The image input terminal 812 has an analog image signal (for example, an RGB signal representing a computer image output from a personal computer, a composite image signal representing a moving image output from a video recorder or a television receiver) or a digital image signal. Is connected to an image signal supply device 814.

  The signal conversion unit 810 performs predetermined signal conversion processing on the image signal input from the image input terminal 812 and outputs the signal to the image processing unit 820. For example, when an analog image signal is input to the signal conversion unit 810, the signal conversion unit 810 performs AD conversion on the analog image signal and outputs the analog image signal to the image processing unit 820 as a digital image signal.

  The image processing unit 820 writes the image data into an image memory (none of which is shown) in order to make the input image signal suitable for display on the liquid crystal devices 400R, 400G, and 400B. The image processing such as reading out is performed and output to the liquid crystal device driver 830.

  Note that image processing refers to scaling processing that matches the resolution of the liquid crystal devices 400R, 400G, and 400B by enlarging and reducing the image represented by the image signal, and the gradation values that the image signal has as the liquid crystal devices 400R, 400G. , 400B, a γ correction process for converting to a gradation value suitable for display, a trapezoidal distortion correction process, a color tone correction process, and the like. Such image processing is performed by executing firmware that defines the image processing procedure stored in the storage unit 850.

  The liquid crystal device driving unit 830 supplies the image signal output from the image processing unit 820 and a driving voltage based on the image signal to the liquid crystal devices 400R, 400G, and 400B, and drives the liquid crystal devices 400R, 400G, and 400B.

  The operation receiving unit 840 receives an operation input from the operation unit 842 or the remote controller 844 by the user, and outputs an operation signal serving as a trigger for various operations to the control unit 800.

  The storage unit 850 is configured by a non-volatile memory such as a mask ROM, flash memory, or FeRAM (Ferroelectric Random Access Memory). The storage unit 850 stores various control programs for instructing and controlling the operation of the projector 1000, such as an activation program for instructing the processing procedure and contents when the projector 1000 is activated, firmware, and data. ing.

  The fan drive unit 860 drives the fan 862 by a drive circuit (not shown) in accordance with a fan drive command from the control unit 800. In the projector 1000, at least one fan 862 and a plurality of cooling air flow paths (not shown) for cooling each optical system and the like are provided. As the fan 862 rotates, air is taken in from the outside of the projector 1000, and the air is circulated in the projector 1000 as a cooling air through a plurality of cooling air flow paths and discharged to the outside. Thereby, the heat generated in each optical system such as the light source device 110 and the liquid crystal devices 400R, 400G, and 400B and the power supply unit 870 can be dissipated and exhausted.

  The power supply unit 870 derives AC power from the external power supply 880 from the plug, and performs a process such as transformation, rectification, and smoothing by a built-in AC / DC conversion unit (none of which is shown) to stabilize the direct current. A voltage is supplied to each part of the projector 1000.

  The control unit 800 is a CPU (Central Processing Unit), and transmits and receives signals to and from each block via the bus line B, and performs overall control of the operation of the projector 1000. The controller 800 controls the solid-state high-frequency oscillator 700 with a control command to turn on or off the arc tube 20.

  As described above, in the light source device 110 according to the first embodiment, the microwave M from the microwave generation unit 10 is reflected by the microwave reflection surface 32 of the microwave reflecting member 30 and is focused on the arc tube 20. This is a light source device that emits an illuminating light beam to the illuminated region side by exciting the luminescent material enclosed in the light source and reflecting the light from the arc tube 20 by the light reflecting surface 42 of the ellipsoidal reflector 40. . That is, according to the light source device 110 according to the first embodiment, since the arc tube can emit light without using an electrode, problems such as electrode wear and electrode tip deformation due to secular change do not occur. As a result, when the light source device 110 according to the first embodiment is used as the light source of the projector 1000, it is possible to suppress occurrence of flickering in the image projected on the screen SCR due to secular change accompanying continuous use. And it becomes possible to suppress that the light utilization efficiency in a to-be-illuminated area falls by the secular change accompanying continuous use.

  Further, according to the light source device 110 according to the first embodiment, since the electrode is not used, the tube portion is not blackened and the cloud portion (devitrification) of the tube portion due to precipitation of the electrode impurities is eliminated. It is possible to prevent the arc tube from being damaged due to the blackening of the bulb part or the cloudiness (devitrification) of the bulb part. As a result, the life of the light source device 110 can be extended.

  Further, according to the light source device 110 according to the first embodiment, the light emitted from the arc tube 20 toward the illuminated area is reflected toward the arc tube 20 by the secondary mirror 50, and thus the arc tube 20 emits the illuminated area. It is possible to effectively use light that has been emitted to the side and has not been effectively used. As a result, the luminance of the light source device 110 can be increased.

  Further, according to the light source device 110 according to the first embodiment, since the secondary mirror 50 is provided, the size of the ellipsoidal reflector 40 is large enough to reflect all the light emitted from the arc tube 20. Therefore, the ellipsoidal reflector 40 can be reduced in size, and as a result, a compact light source device 110 can be realized.

  Further, according to the light source device 110 according to the first embodiment, since no electrode is present inside the arc tube 20, the light reflected by the secondary mirror 50 and incident on the arc tube 20 is not blocked by the electrode. .

  Further, according to the light source device 110 according to the first embodiment, the internal pressure of the arc tube 20 does not require a high atmospheric pressure like a high-pressure mercury lamp, so that the arc tube does not rupture at the end of the lamp life. . As a result, it is not necessary to devise an explosion-proof structure.

  The light source device 110 according to the first embodiment further includes a secondary mirror side support member 62 (corresponding to the support member of the present invention) disposed between the arc tube 20 and the secondary mirror 50. The light reflecting member is the secondary mirror 50 disposed on the arc tube 20 via the secondary mirror side support member 62 so as to cover the outer surface of the arc tube 20 on the illuminated area side. As a result, the light emitted from the arc tube 20 toward the illuminated area by the sub mirror 50 can be reflected toward the arc tube 20. In addition, since a space is formed between the arc tube 20 and the sub mirror 50, the arc tube 20 can be effectively cooled, and the life of the light source device 110 can be further extended.

  The light source device 110 according to the first embodiment further includes the light source case 80 described above, and the light source case 80 has a function of shielding microwaves. Thereby, since it is possible to prevent microwaves from leaking outside the light source device 110, the light source device does not adversely affect the human body, peripheral electronic devices, and the like.

  Since the projector 1000 according to the first embodiment includes the light source device 110 described above, it is possible to suppress occurrence of flickering in an image projected on the screen SCR due to secular change accompanying continuous use, and continuous use. It is possible to suppress a decrease in light use efficiency in the illuminated area due to the secular change accompanying the above, and it becomes an excellent projector including a light source device capable of extending the life.

  In the light source device 110 according to the first embodiment, the secondary mirror 50 disposed on the arc tube 20 via the secondary mirror side support member 62 is used as the light reflecting member. However, the present invention is not limited to this. For example, the following modifications are possible.

  FIG. 8 is a view showing a modification of the light reflecting member. FIGS. 8A to 8C are views showing light reflecting members (secondary mirrors 50a and 50b or reflecting film 50c) of Modifications 1 to 3. FIG.

  As shown in FIG. 8 (a), the first modification is a light reflecting member that is disposed in close contact with the outer surface of the arc tube 20 so as to cover the outer surface of the arc tube 20 on the illuminated area side. This is an example using a mirror 50a. The secondary mirror 50 a has a light reflecting surface 52 a that reflects the light emitted from the arc tube 20 toward the illuminated area toward the arc tube 20.

  In the second modification, as shown in FIG. 8B, the light reflecting member is disposed on the arc tube 20 via the secondary mirror side support member 62 so as to cover the outer surface of the arc tube 20 on the illuminated region side. In addition, this is an example using the secondary mirror 50b in which a lens 56b for emitting light from the arc tube 20 toward the illuminated area is disposed. The sub mirror 50 b has a light reflecting surface 52 b that reflects light emitted from the arc tube 20 toward the illuminated region toward the arc tube 20. An opening 54b is formed in the central portion of the secondary mirror 50b, and a lens 56b is disposed in the opening 54b.

  As shown in FIG. 8C, the third modification uses a reflective film 50c formed on the outer surface of the arc tube 20 so as to cover the outer surface of the arc tube 20 on the illuminated area side as a light reflecting member. This is an example. The sub mirror 50 c has a light reflecting surface 52 c that reflects light emitted from the arc tube 20 toward the illuminated region toward the arc tube 20.

  Even when the secondary mirrors 50a, 50b or the reflective film 50c of Modifications 1 to 3 are used as the light reflecting member, as in the case of using the secondary mirror 50 described above, the light emitting tube 20 is to be illuminated. Since the light emitted from the arc tube 20 is reflected toward the arc tube 20 by the secondary mirrors 50a, 50b or the reflective film 50c, the light that is emitted from the arc tube 20 to the illuminated area side and was not effectively used originally is also effective. It becomes possible to use it. As a result, the brightness of the light source device can be increased. Further, it is not necessary to set the size of the ellipsoidal reflector to a size that reflects all of the light emitted from the arc tube 20, and the ellipsoidal reflector can be reduced in size, resulting in a compact size. It is possible to realize a simple light source device.

  When the secondary mirror 50b of Modification 2 is used as the light reflecting member, the light emitted from the arc tube 20 toward the central portion of the secondary mirror 50b is emitted toward the illuminated area by the lens 56b. Therefore, it is possible to effectively use such light, and it is possible to improve light use efficiency.

[Embodiment 2]
FIG. 9 is a diagram for explaining the light source device 112 according to the second embodiment. FIG. 9A is a schematic diagram illustrating a configuration of the light source device 112, and FIG. 9B is a schematic diagram illustrating a state in which light L is emitted from the light source device 112. 9, the same members as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The light source device 112 according to the second embodiment basically has a configuration that is very similar to the light source device 110 according to the first embodiment, but the configuration of the reflector and the microwave reflecting member is the same as that of the light source device 110 according to the first embodiment. Is different.

  That is, the light source device 112 according to the second embodiment includes an ellipsoidal reflector 40B integrated with the microwave reflecting member 30B as shown in FIG.

  The ellipsoidal reflector 40B has a light reflecting surface 42B that reflects the light from the arc tube 20 toward the second focal position, and the back surface side (z axis (−)) of the arc tube 20 via the reflector side support member 60. Side). The light reflecting surface 42 </ b> B has a function of transmitting the microwave M from the microwave generator 10 and reflecting the light L from the arc tube 20. As the ellipsoidal reflector 40B, a thicker one than the ellipsoidal reflector 40 described in the first embodiment is used.

  The microwave reflecting member 30B disposed inside the ellipsoidal reflector 40B has a microwave reflecting surface 32B that reflects and focuses the microwave M emitted from the microwave generator 10 toward the arc tube 20. The microwave reflecting surface 32B has, for example, a parabolic shape, and is configured such that the central portion of the arc tube 20 is substantially in the focal position.

  As materials constituting the ellipsoidal reflector 40B and the microwave reflecting member 30B, the same materials as those of the ellipsoidal reflector 40 and the microwave reflecting member 30 described in the first embodiment can be used.

  As described above, the light source device 112 according to the second embodiment differs from the light source device 110 according to the first embodiment in the configuration of the reflector and the microwave reflecting member, but is similar to the light source device 110 according to the first embodiment. The microwave generator 10, the arc tube 20, the microwave reflection member 30 B that reflects and focuses the microwave M emitted from the microwave generator 10 toward the arc tube 20, and the light from the arc tube 20 Since the ellipsoidal reflector 40B that reflects the light toward the illuminated area and the secondary mirror 50 as the light reflecting member are provided, it is possible to suppress the occurrence of flickering in the image projected on the screen due to secular change due to continuous use. In addition, it is possible to suppress a decrease in light utilization efficiency in the illuminated area due to secular change associated with continuous use, and to extend the service life. It becomes possible light source device.

  In the light source device 112 according to the second embodiment, the light emitted from the arc tube 20 toward the illuminated region is reflected toward the arc tube 20 by the secondary mirror 50, and thus emitted from the arc tube 20 toward the illuminated region. In addition, it is possible to effectively use light that was not originally used effectively. As a result, the brightness of the light source device 112 can be increased.

  Since the light source device 112 according to the second embodiment includes the secondary mirror 50 described above, the size of the ellipsoidal reflector 40B is set to a size that reflects all of the light emitted from the arc tube 20. Therefore, the ellipsoidal reflector 40B can be downsized, and as a result, the compact light source device 112 can be realized.

  Since the light source device 112 according to the second embodiment includes the ellipsoidal reflector 40B integrated with the microwave reflecting member 30B as described above, the light source device 112 is a relatively compact light source device.

  The light source device 112 according to the second embodiment has the same configuration as that of the light source device 110 according to the first embodiment except that the configurations of the reflector and the microwave reflecting member are different, and thus the light source device 110 according to the first embodiment. Among the effects possessed, the corresponding effect is maintained as it is.

[Embodiment 3]
FIG. 10 is a diagram for explaining the light source device 114 according to the third embodiment. FIG. 10A is a schematic diagram illustrating a configuration of the light source device 114, and FIG. 10B is a schematic diagram illustrating a state in which light L is emitted from the light source device 114. 10, the same members as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The light source device 114 according to the third embodiment basically has a configuration that is very similar to that of the light source device 110 according to the first embodiment, but the arrangement position of the microwave generation unit and the configurations of the light reflecting member and the microwave reflecting member are the same. This is different from the light source device 110 according to the first embodiment.

  That is, in the light source device 114 according to the third embodiment, as illustrated in FIG. 10, the microwave generation unit 10 </ b> B is disposed on the back side (z-axis (−) side) of the ellipsoidal reflector 40. A secondary mirror 50B integrated with the member 30C is provided. The microwave generation unit 10B has the same configuration as the microwave generation unit 10 described in the first embodiment, and thus detailed description thereof is omitted.

  The sub mirror 50 </ b> B is a light reflecting member that covers approximately half of the arc tube 20 and is disposed to face the light reflecting surface 42 of the elliptical reflector 40. The secondary mirror 50 </ b> B has a light reflecting surface 52 </ b> B that reflects the light emitted from the arc tube 20 toward the illuminated area toward the arc tube 20, and the secondary mirror 50 </ b> B of the arc tube 20 through the secondary mirror side support member 62. It is arranged on the front side (z axis (+) side). The light L reflected by the light reflecting surface 52B of the secondary mirror 50B passes through the arc tube 20 and enters the ellipsoidal reflector 40.

  The microwave reflecting member 30C disposed on the outer surface of the secondary mirror 50B (the surface on the illuminated area side) reflects the microwave M emitted from the microwave generator 10B toward the arc tube 20 and focuses it. It has a reflecting surface 32C. The microwave reflecting surface 32C has, for example, a parabolic shape, and is configured such that the central portion of the arc tube 20 is substantially in the focal position.

  As materials constituting the secondary mirror 50B and the microwave reflecting member 30C, the same materials as those of the secondary mirror 50 and the microwave reflecting member 30 described in the first embodiment can be used.

  As described above, the light source device 114 according to the third embodiment is different from the light source device 110 according to the first embodiment in the arrangement position of the microwave generation unit and the configuration of the light reflecting member and the microwave reflecting member. As in the case of the light source device 110 according to the above, the microwave generation unit 10B, the arc tube 20, and the microwave reflection that reflects and focuses the microwave M emitted from the microwave generation unit 10B toward the arc tube 20 Since the member 30C, the ellipsoidal reflector 40, and the secondary mirror 50B as a light reflecting member are provided, it is possible to suppress the occurrence of flickering in the image projected on the screen due to secular change accompanying continuous use. In addition, it is possible to suppress a decrease in light utilization efficiency in the illuminated area due to secular change associated with continuous use, and it is possible to extend the service life. A light source device.

  In the light source device 114 according to the third embodiment, the light emitted from the arc tube 20 toward the illuminated region is reflected toward the arc tube 20 by the secondary mirror 50B, and thus emitted from the arc tube 20 toward the illuminated region. In addition, it is possible to effectively use light that was not originally used effectively. As a result, the luminance of the light source device 114 can be increased.

  Since the light source device 114 according to the third embodiment includes the secondary mirror 50B described above, the size of the ellipsoidal reflector 40 is set to a size that reflects all of the light emitted from the arc tube 20. Therefore, the ellipsoidal reflector 40 can be downsized, and as a result, the compact light source device 114 can be realized.

  Since the light source device 114 according to the third embodiment includes the secondary mirror 50B integrated with the microwave reflecting member 30C as described above, compared to the light source device 110 according to the first embodiment, the microwave reflecting member. It is possible to reduce the arrangement space of the apparatus, and it is possible to reduce the size of the apparatus.

  The light source device 114 according to the third embodiment has the same configuration as the light source device 110 according to the first embodiment, except that the arrangement position of the microwave generation unit and the configurations of the light reflecting member and the microwave reflecting member are different. Therefore, it has the corresponding effect as it is among the effects of the light source device 110 according to the first embodiment.

[Embodiment 4]
FIG. 11 is a diagram for explaining the light source device 116 according to the fourth embodiment. FIG. 11A is a schematic diagram showing a configuration of the light source device 116, and FIG. 11B is a cross-sectional view taken along line AA of FIG. 11A. In FIG. 11, the same members as those in FIG. 10 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The light source device 116 according to the fourth embodiment basically has a configuration similar to that of the light source device 114 according to the third embodiment, but is different from the light source device 114 according to the third embodiment in that it further includes a magnetic field generation unit. Different.

  The magnetic field generation unit 90 is formed of a permanent magnet configured with an N pole on the microwave generation unit 10B side (z axis (−) side) and an S pole on the illuminated region side (z axis (+) side). As the permanent magnet, for example, a samarium rare earth magnet, a neodi rare earth magnet, a ferrite magnet, an alnico magnet or the like can be suitably used. The direction of the magnetic poles may be reversed, and the microwave generator 10B side (z-axis (−) side) may be configured with the S pole, and the illuminated region side (z-axis (+) side) may be configured with the N pole. Good.

  The magnetic field generator 90 has a ring shape, and an elliptical reflector so that the central axis of the magnetic field generator 90 (the central axis when the magnetic field generator 90 is viewed along the z-axis direction) coincides with the optical axis OC. 40 is arranged outside. Further, FIG. 11A shows an xy plane passing through a midpoint (not shown) between the end surface 92 on the microwave generation unit 10B side in the magnetic field generation unit 90 and the end surface 94 on the illuminated region side in the magnetic field generation unit 90. The magnetic field generator 90 is disposed with respect to the arc tube 20 so that the A-A plane shown in FIG. The magnetic field generated by the magnetic field generator 90 can concentrate the magnetic field on the central portion of the arc tube 20.

  As described above, the light source device 116 according to the fourth embodiment is different from the light source device 114 according to the third embodiment in that it further includes a magnetic field generation unit, but as in the case of the light source device 114 according to the third embodiment, Since the microwave generation unit 10B, the arc tube 20, the microwave reflection member 30C, the ellipsoidal reflector 40, and the secondary mirror 50B as a light reflection member are provided, the projection is projected on the screen due to secular change accompanying continuous use. It is possible to suppress the occurrence of flickering in the image, and it is possible to prevent the light use efficiency in the illuminated area from being deteriorated due to secular change due to continuous use, and to extend the life. Thus, the light source device can be used.

  In the light source device 116 according to the fourth embodiment, the light emitted from the arc tube 20 toward the illuminated region is reflected toward the arc tube 20 by the secondary mirror 50B, and thus emitted from the arc tube 20 toward the illuminated region. In addition, it is possible to effectively use light that was not originally used effectively. As a result, the luminance of the light source device 116 can be increased.

  Since the light source device 116 according to the fourth embodiment includes the secondary mirror 50B described above, the size of the ellipsoidal reflector 40 is set to a size that reflects all of the light emitted from the arc tube 20. Therefore, the ellipsoidal reflector 40 can be downsized, and as a result, the compact light source device 116 can be realized.

  Since the light source device 116 according to the fourth embodiment further includes the magnetic field generation unit 90 described above, by concentrating the magnetic field on the central portion of the arc tube 20, plasma generated in the arc tube 20 is further generated in the arc tube 20. It becomes possible to concentrate on the center. As a result, it is possible to prevent light emission from becoming unstable or uneven light emission, and to improve the light emission stability.

  In the light source device 116 according to the fourth embodiment, the plasma generated in the arc tube 20 can be further concentrated on the central portion of the arc tube 20 as described above. It will approach. As a result, the light source device 116 according to Embodiment 4 becomes a light source device having high light emission efficiency and excellent light distribution, and the light use efficiency in the optical system at the latter stage of the optical path is improved.

  The light source device 116 according to the fourth embodiment has the same configuration as that of the light source device 114 according to the third embodiment except that the light source device 116 further includes a magnetic field generation unit. Of which, it has the relevant effect.

[Embodiment 5]
FIG. 12 is a view for explaining the light source device 118 according to the fifth embodiment. 12A is a schematic diagram showing a configuration of the light source device 118, and FIG. 12B is a schematic diagram showing a state in which light L is emitted from the light source device 118. As shown in FIG. In FIG. 12, the same members as those in FIGS. 2 and 10 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The light source device 118 according to the fifth embodiment basically has a configuration similar to that of the light source devices 110 and 114 according to the first or third embodiment, but the configuration of the microwave reflecting member is according to the first or third embodiment. Different from the light source devices 110 and 114.

  That is, in the light source device 118 according to the fifth embodiment, as illustrated in FIG. 12, the microwave reflecting member 30 </ b> D is disposed on the front side (z-axis (+) side) of the ellipsoidal reflector 40 </ b> C (described later). ing. The microwave reflecting member 30D is made of, for example, a metal member that is a conductive material, and has a microwave reflecting surface 32D that reflects and focuses the microwave M emitted from the microwave generating unit 10B toward the arc tube 20. . The microwave reflecting surface 32D has, for example, a parabolic shape, and is configured such that the central portion of the arc tube 20 is substantially in the focal position.

  The microwave reflecting member 30D has a high light transmittance and is configured to shield the microwave. For example, the microwave reflecting member 30D includes a metal mesh member having a plurality of holes 34D. The diameter of the hole 34D is set to ¼ or less of the wavelength of the microwave radiated from the microwave generator 10B. Thereby, the light L from the ellipsoidal reflector 40C can be passed without passing the microwave M from the microwave generator 10B.

  In the light source device 118 according to the fifth embodiment, the configuration of the microwave reflecting member is different, and instead of the elliptical reflector 40 described in the first embodiment, an elliptical reflector 40C having an engaging portion 44C on the open end surface. It has. By engaging the end of the microwave reflecting member 30D with the engaging portion 44C, the ellipsoidal reflector 40C is fixed to the microwave reflecting member 30D. The configuration of the ellipsoidal reflector 40C is the same as that of the ellipsoidal reflector 40 described in the first embodiment, and a detailed description thereof will be omitted.

  In the light source device 118 according to the fifth embodiment, a portion corresponding to a position where the microwave reflecting member 30 </ b> D is arranged instead of the light source case 80 described in the first embodiment because the configuration of the microwave reflecting member is different. Is provided with a light source case 80B having an opening 82B. The microwave reflecting member 30D and the elliptical reflector 40C are fixed to the light source case 80B by bringing the end of the microwave reflecting member 30D and the open end surface of the elliptical reflector 40C into contact with the opening 82B of the light source case 80B. The material and function of the light source case 80B are the same as those of the light source case 80 described in the first embodiment, and thus detailed description thereof is omitted.

  As described above, the light source device 118 according to the fifth embodiment is different from the light source devices 110 and 114 according to the first or third embodiment in the configuration of the microwave reflecting member and the configurations of the ellipsoidal reflector and the light source case. As in the case of the light source devices 110 and 114 according to 1 or 3, the microwave generator 10B, the arc tube 20, and the microwave M emitted from the microwave generator 10B are reflected toward the arc tube 20. Since the microwave reflecting member 30D to be focused, the ellipsoidal reflector 40C, and the secondary mirror 50 as a light reflecting member are provided, it is possible to suppress the occurrence of flickering in the image projected on the screen due to secular change accompanying continuous use. It is possible, and it is possible to suppress a decrease in light use efficiency in the illuminated area due to secular change associated with continuous use. A light source device capable of achieving life.

  In the light source device 118 according to the fifth embodiment, the light emitted from the arc tube 20 toward the illuminated region is reflected by the secondary mirror 50 toward the arc tube 20, and thus emitted from the arc tube 20 toward the illuminated region. In addition, it is possible to effectively use light that was not originally used effectively. As a result, the luminance of the light source device 118 can be increased.

  Since the light source device 118 according to the fifth embodiment includes the secondary mirror 50 described above, the size of the ellipsoidal reflector 40C is set to a size that reflects all of the light emitted from the arc tube 20. Therefore, the ellipsoidal reflector 40C can be downsized, and as a result, the compact light source device 118 can be realized.

  In the light source device 118 according to the fifth embodiment, the microwave generation unit 10B is disposed on the back side of the elliptical reflector 40C, and the microwave reflection member 30D is an elliptical surface via the engagement portion 44C of the elliptical reflector 40C. Since it has the structure supported and fixed to the reflector 40C, it becomes a relatively compact light source device.

  The light source device 118 according to the fifth embodiment has the same configuration as that of the light source devices 110 and 114 according to the first or third embodiment except that the configuration of the microwave reflecting member and the configurations of the ellipsoidal reflector and the light source case are different. Therefore, it has the corresponding effect as it is among the effects of the light source devices 110 and 114 according to the first or third embodiment.

[Embodiment 6]
FIG. 13 is a diagram for explaining the light source device 120 according to the sixth embodiment. FIG. 13A is a schematic diagram illustrating a configuration of the light source device 120, and FIG. 13B is a schematic diagram illustrating a state in which light L is emitted from the light source device 120. In FIG. 13, the same members as those in FIGS. 2 and 10 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The light source device 120 according to the sixth embodiment basically has a configuration that is very similar to the light source devices 110 and 114 according to the first or third embodiment, but the configuration of the microwave reflecting member is according to the first or third embodiment. Different from the light source devices 110 and 114.

  That is, in the light source device 120 according to the sixth embodiment, the microwave reflecting member 30E is integrally formed with the concave lens 72, as shown in FIG. The microwave reflection member 30E is made of, for example, a metal member that is a conductive material, and includes a microwave reflection surface 32E that reflects and focuses the microwave M emitted from the microwave generation unit 10B toward the arc tube 20. . The microwave reflecting surface 32E has, for example, a parabolic shape, and is configured such that the central portion of the arc tube 20 is substantially in the focal position.

  The microwave reflecting member 30E has a high light transmittance and is configured to shield microwaves, and is formed of, for example, a metal mesh member having a plurality of holes 34E. The diameter of the hole 34E is set to ¼ or less of the wavelength of the microwave radiated from the microwave generator 10B. Thereby, the light L from the ellipsoidal reflector 40 can be passed without passing the microwave M from the microwave generation part 10B.

  In the light source device 120 according to the sixth embodiment, each member constituting the light source device 120 including the concave lens 72 is used instead of the light source case 80 described in the first embodiment because the configuration of the microwave reflecting member is different. A light source case 80C for housing is provided.

  In addition, although description by illustration is abbreviate | omitted here, in the area | region where the light inject | emitted from the concave lens 72 passes among the light source cases 80C, the member which has a light transmittance and the function which shields a microwave is arrange | positioned Has been. For example, a metal mesh member having a plurality of holes is arranged in a region through which light emitted from the concave lens 72 in the light source case 80C passes. The diameter of the hole is set to ¼ or less of the wavelength of the microwave radiated from the microwave generator 10B.

  As described above, the light source device 120 according to the sixth embodiment differs from the light source devices 110 and 114 according to the first or third embodiment in the configuration of the microwave reflecting member, but the light source device 110 or the first embodiment according to the first or third embodiment. Similarly to the case of 114, the microwave generator 10B, the arc tube 20, and the microwave reflecting member 30E that reflects and focuses the microwave M emitted from the microwave generator 10B toward the arc tube 20, Since the ellipsoidal reflector 40 and the secondary mirror 50 as a light reflecting member are provided, it is possible to suppress the occurrence of flickering in the image projected on the screen due to secular change accompanying continuous use, and continuous use. Therefore, it is possible to suppress the light use efficiency in the illuminated area from being lowered due to the secular change that accompanies the light source, and it becomes a light source device capable of extending the life.

  In the light source device 120 according to the sixth embodiment, the light emitted from the arc tube 20 toward the illuminated region is reflected by the secondary mirror 50 toward the arc tube 20, and thus emitted from the arc tube 20 toward the illuminated region. In addition, it is possible to effectively use light that was not originally used effectively. As a result, the luminance of the light source device 120 can be increased.

  Since the light source device 120 according to the sixth embodiment includes the secondary mirror 50 described above, the size of the ellipsoidal reflector 40 is set to a size that reflects all of the light emitted from the arc tube 20. Therefore, the ellipsoidal reflector 40 can be downsized, and as a result, the compact light source device 120 can be realized.

  In the light source device 120 according to the sixth embodiment, the microwave generation unit 10B is disposed on the back side of the elliptical reflector 40C, and the microwave reflection member 30E is integrally formed with the concave lens 72, so that it is relatively compact. It becomes a light source device.

  The light source device 120 according to the sixth embodiment has the same configuration as the light source devices 110 and 114 according to the first or third embodiment except that the configuration of the microwave reflecting member is different. The corresponding light source device 110, 114 has the corresponding effect as it is.

  Although the light source device and the projector of the present invention have been described based on the above embodiments, the present invention is not limited to the above embodiments, and can be implemented in various modes without departing from the scope of the invention. For example, the following modifications are possible.

(1) As a modification of the light reflecting member in the first embodiment, the light reflecting member (secondary mirror 50a, 50b or reflecting film 50c) of Modifications 1 to 3 has been described, but the present invention is limited to this. is not. For example, the lens 56b that is a part of the configuration of the light reflecting member (sub mirror 50b) of the modification 2 may be added to the configuration of the light reflecting member (sub mirror 50a) of the first modification. That is, the light reflecting member is disposed in close contact with the outer surface of the arc tube so as to cover the outer surface of the arc tube on the illuminated region side, and emits light from the arc tube toward the illuminated region side. You may use the secondary mirror by which the lens to perform is arrange | positioned in the center part. Similarly, the lens 56b may be added to the configuration of the light reflecting member (reflective film 50c) of Modification 3. That is, as a light reflecting member, a lens that is formed on the outer surface of the arc tube so as to cover the outer surface of the arc tube on the illuminated region side and that emits light from the arc tube toward the illuminated region side is the center. You may use the reflecting film arrange | positioned at the part.

(2) In the light source devices 110 to 120 according to each of the embodiments described above, the case where the microwave reflection surface of the microwave reflection member has a parabolic shape has been described as an example, but the present invention is limited to this. It is not a thing. As long as it is possible to reflect and focus the microwave radiated from the microwave generator toward the arc tube, the microwave reflecting surface may have another shape such as an elliptical surface or a spherical surface. Moreover, in the light source devices 110 to 120 according to the above embodiments, the microwave radiated from the microwave generation unit is a substantially plane wave, but the present invention is not limited to this. By using a non-directional dipole antenna or the like, the microwave radiated from the microwave generation unit may be a substantially spherical wave. In addition, when the microwave radiated | emitted from a microwave generation part is a substantially spherical wave, it is preferable that a microwave reflective surface becomes an ellipsoid shape. Thereby, the microwave can be reflected by the microwave reflecting surface without being diverged, and the microwave can be efficiently focused on the arc tube.

(3) In the light source devices 110 to 118 according to the first to fifth embodiments, the ellipsoidal reflector is used as the reflector. However, the present invention is not limited to this, and a parabolic reflector or a spherical reflector is used. It is also preferable to use it. When a parabolic reflector is used, the light from the parabolic reflector becomes substantially parallel light, so that the concave lens can be omitted.

(4) In the light source devices 110 to 116 according to Embodiments 1 to 4, the microwave reflecting member in which a plurality of holes are not formed is used, but the present invention is not limited to this, and the embodiment A microwave reflection member made of a metal mesh member having a plurality of holes as described in 5 and 6 may be used.

(5) In the light source devices 110 and 112 according to the first or second embodiment, the case where the microwave generation unit is disposed on the lower side (y-axis (−) side) of the ellipsoidal reflector will be described as an example. However, the present invention is not limited to this, and may be arranged on the upper side (y-axis (+) side) of the ellipsoidal reflector, or on the right side (x-axis ( (+) Side) or the left side (x-axis (−) side) when viewed from the front. In addition, it is preferable to arrange | position a microwave reflection member so that a microwave generation part may be opposed.

(6) In the light source device 116 according to the fourth embodiment, the case where one magnetic field generation unit having a ring shape is arranged outside the ellipsoidal reflector has been described as an example, but the present invention is limited to this. It is not a thing. For example, a plurality of magnetic field generators having an arcuate cross section may be arranged concentrically and at equal intervals outside the ellipsoidal reflector.

(7) In the light source device 116 according to the fourth embodiment, the case where the magnetic field generation unit made of a permanent magnet is provided has been described as an example. However, the present invention is not limited to this, and the magnetic field generation made of an electromagnet is performed. May be provided. Examples of the electromagnet in this case include a solenoid coil in which a copper wire is wound around a metal material. When a magnetic field generator comprising an electromagnet is provided, the current supply unit that outputs a predetermined current to the electromagnet and the current value applied to the electromagnet (solenoid coil) are determined in the circuit configuration of the projector. It is preferable to add an electromagnet controller that controls the magnitude of the magnetic field generated by the electromagnet by driving the supply unit.

(8) In the light source device 118 according to the fifth embodiment, the ellipsoidal reflector 40C having the engaging portion 44C is used, and the end portion of the microwave reflecting member 30D is engaged with the engaging portion 44C, thereby microwaves. Although the ellipsoidal reflector 40C is fixed to the reflecting member 30D, the present invention is not limited to this, and the ellipsoidal reflector may be fixed to the microwave reflecting member using other fixing means.

(9) In the light source device 118 according to the fifth embodiment, the light source case 80B having the opening 82B is used. However, the present invention is not limited to this, and the light source case 80 described in the first embodiment is not limited thereto. As described above, a light source case in which no opening is formed may be used.

(10) In the projector 1000 according to the first embodiment, the solid-state high-frequency oscillator 700 includes the diamond SAW oscillator 710, the first amplifier 720, and the power source 730, but the present invention is not limited to this. Instead, the solid-state high-frequency oscillation unit may further include a voltage adjustment unit, and the amplification degree of the first amplifier 720 may be variable. As a result, the microwave output level can be changed, so that the luminance of the arc tube 20 can be adjusted. As a result, the brightness of the image projected on the screen can be adjusted by adjusting the amplification degree of the first amplifier 720 in accordance with the brightness and darkness of the video scene.

(11) In the projector 1000 according to the first embodiment, the waveguide unit 760 includes the isolator 764, but the present invention is not limited to this. When there is no influence of the reflected wave, the waveguide portion may not have an isolator. Further, when the solid high-frequency oscillation unit 700 is affected by other noise or the like, the configuration of the isolator 764 may be changed or another isolator may be added.

(12) In the projector 1000 according to the first embodiment, the case where a high-frequency signal in the 2.45 GHz band is output from the solid-state high-frequency oscillator 700 has been described as an example, but the present invention is not limited to this. Absent. By appropriately changing the configuration of the diamond SAW resonator 740, high-frequency signals having various frequencies can be output.

(13) In the projector 1000 according to the first embodiment, the lens integrator optical system including a lens array is used as the light uniformizing optical system. However, the present invention is not limited to this, and includes a rod member. A rod integrator optical system can also be preferably used.

(14) The projector 1000 according to the first embodiment is a transmissive projector, but the present invention is not limited to this. The present invention can also be applied to a reflection type projector. Here, “transmission type” means that an electro-optic modulation device as a light modulation means, such as a transmission type liquid crystal device, transmits light, and “reflection type” This means that an electro-optic modulation device as a light modulation means, such as a reflective liquid crystal device, is a type that reflects light. Even when the present invention is applied to a reflective projector, the same effect as that of a transmissive projector can be obtained.

(15) In the projector 1000 according to the first embodiment, the projector using the three liquid crystal devices 400R, 400G, and 400B has been described as an example. However, the present invention is not limited to this, and one projector, The present invention can also be applied to a projector using two or four or more liquid crystal devices.

(16) In the projector 1000 according to the first embodiment, a liquid crystal device is used as the electro-optic modulation device, but the present invention is not limited to this. In general, the electro-optic modulation device may be any device that modulates incident light in accordance with image information, and a micromirror light modulation device or the like may be used. For example, a DMD (digital micromirror device) (trademark of TI) can be used as the micromirror light modulator.

(17) The present invention is applied to a rear projection type projector that projects from a side opposite to the side that observes the projected image, even when applied to a front projection type projector that projects from the side that observes the projected image. Is also possible.

(18) The present invention can be applied to a light source device used for lighting equipment such as an aircraft, a ship, and a vehicle in addition to an optical equipment such as a projector.

FIG. 3 shows an optical system of the projector 1000 according to the first embodiment. The figure shown in order to demonstrate the light source device 110 which concerns on Embodiment 1. FIG. FIG. 2 is a block diagram showing a configuration of a microwave generation unit 10. The block diagram which shows the structure of the diamond SAW oscillator 710. FIG. FIG. 4 is a cross-sectional view showing the structure of a diamond SAW resonator 740. The figure which shows the relationship between the frequency and intensity | strength of the signal output from the diamond SAW oscillator 710. FIG. FIG. 3 is a circuit block diagram of the projector 1000 according to the first embodiment. The figure which shows the modification of a light reflection member. The figure shown in order to demonstrate the light source device 112 which concerns on Embodiment 2. FIG. The figure shown in order to demonstrate the light source device 114 which concerns on Embodiment 3. FIG. The figure shown in order to demonstrate the light source device 116 which concerns on Embodiment 4. FIG. The figure shown in order to demonstrate the light source device 118 which concerns on Embodiment 5. FIG. The figure shown in order to demonstrate the light source device 120 which concerns on Embodiment 6. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,10B ... Microwave generation part, 20 ... Light-emitting tube, 30, 30B, 30C, 30D, 30E ... Microwave reflecting member, 32, 32B, 32C, 32D, 32E ... Microwave reflecting surface, 40, 40B, 40C ... Ellipsoidal reflector, 42, 42B, 42C ... light reflecting surface, 44C ... engaging portion, 50, 50B, 50a, 50b ... secondary mirror, 50c ... reflecting film, 52, 52B, 52a, 52b, 52c ... light reflecting surface, 54b ... opening, 56b ... lens, 60 ... reflector side support member, 62 ... secondary mirror side support member, 70, 72 ... concave lens, 80, 80B, 80C ... light source case, 82B ... opening, 100 ... illumination device, 110 , 112, 114, 116, 118, 120 ... light source device, 160 ... first lens array, 162 ... first small lens, 170 ... second lens array, 172 ... second small 180 ... polarization conversion element, 190 ... superimposed lens, 200 ... color separation light guide optical system, 210,220 ... dichroic mirror, 230,240,250 ... reflection mirror, 260 ... incident side lens, 270 ... relay lens, 300R , 300G, 300B ... condensing lens, 400R, 400G, 400B ... liquid crystal device, 500 ... cross dichroic prism, 600 ... projection optical system, 700 ... solid high-frequency oscillator, 710 ... diamond SAW oscillator, 712 ... phase shift circuit, 714 2nd amplifier, 716 ... power divider, 718 ... loop circuit, 719 ... buffer circuit, 720 ... 1st amplifier, 730 ... power supply, 740 ... diamond SAW resonator, 742 ... silicon substrate, 744 ... diamond single crystal layer, 746 ... Thin film piezoelectric layer, 748 ... Silicon oxide film, 750 ... IDT Pole, 760 ... Waveguide section, 762 ... Antenna, 764 ... Isolator, 800 ... Control section, 810 ... Signal conversion section, 812 ... Image input terminal, 814 ... Image signal supply device, 820 ... Image processing section, 830 ... Liquid crystal device Drive unit, 840 ... operation receiving unit, 842 ... operation unit, 844 ... remote control, 850 ... storage unit, 860 ... fan drive unit, 862 ... fan, 870 ... power supply unit, 880 ... external power supply, 1000 ... projector, B ... bus Line, L ... light, M ... microwave, OC ... optical axis of lighting device, SCR ... screen

Claims (7)

A microwave generator that emits microwaves;
An arc tube in which a luminescent material that emits light by microwaves is enclosed;
A microwave reflecting member that reflects and focuses the microwave radiated from the microwave generation unit toward the arc tube;
A reflector that reflects the light from the arc tube toward the illuminated area;
A light source comprising: a light reflecting member that is disposed on the illuminated region side of the arc tube and reflects light emitted from the arc tube toward the illuminated region side toward the arc tube. apparatus. The light source device according to claim 1,
The light source device according to claim 1, wherein the light reflecting member is a secondary mirror disposed in close contact with the outer surface of the arc tube so as to cover the outer surface of the arc tube on the illuminated area side. The light source device according to claim 1,
A support member disposed between the arc tube and the light reflecting member;
The light source device according to claim 1, wherein the light reflecting member is a secondary mirror disposed on the arc tube via the support member so as to cover an outer surface of the arc tube on the illuminated area side. The light source device according to claim 1,
The light source device, wherein the light reflecting member is a reflecting film formed on an outer surface of the arc tube so as to cover an outer surface of the arc tube on the illuminated area side. In the light source device in any one of Claims 1-4,
A light source device, wherein a lens that emits light from the arc tube toward the illuminated area is disposed at a central portion of the light reflecting member. In the light source device according to any one of claims 1 to 5,
A light source case that houses the microwave generation unit, the arc tube, the microwave reflection member, the reflector, and the light reflection member;
The light source case has a function of shielding microwaves. A light source device according to any one of claims 1 to 6,
A liquid crystal device that modulates illumination light flux from the light source device according to image information;
A projector comprising: a projection optical system that projects light modulated by the liquid crystal device.

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