JP2008171658A - Microwave electrodeless lamp, lighting system, and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microwave electrodeless lamp of long life, high luminous efficiency, and high brightness. <P>SOLUTION: The microwave electrodeless lamp 10 is structured of an enclosing space 21 made of a non-conductive material with a luminescent substance enclosed inside, a transparent vessel 20 equipped with a depressed part 26 entering inside the sealing space 21 going around an outer periphery, and a conductor 30 of a ring shape fitted along an outer periphery part of the depressed part 26. The microwave electrodeless lamp 10, with microwaves irradiated on it, concentrates electric field components of the microwaves on the center part of the enclosing space 21 by the conductor 30 to emit light in high efficiency. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a microwave electrodeless lamp that emits light by irradiating a luminescent material with microwaves, an illumination device including the microwave electrodeless lamp, and a projector including the illumination device.

  Projectors that project images or video information according to video signals are often used for presentations, theaters, and the like. The light sources of these projectors can be quickly turned on in order to obtain a bright projected image quickly, ensuring a high intensity and a stable amount of light, adjusting the amount of light without changing the emission spectrum, Long life is expected. Microwave electrodeless lamps and illumination devices using microwave electrodeless lamps as such light sources have been proposed.

  As a microwave electrodeless lamp and an illuminating device, a discharge vessel having a bulging portion and a thin tube portion connected to the bulging portion, and a discharge concentrator supported by the thin tube portion and having a tip portion facing the discharge space of the bulging portion (internal conductivity) And a high-frequency power source for supplying energy to excite discharge to the above-described discharge concentrator is connected to a cylindrical external conductor inserted on the outer periphery of the thin tube portion of the lamp. Is known (see, for example, Patent Document 1).

  Also, an antenna is coupled to a coaxial transmission line having one end connected to the microwave generator, and a coaxial resonator coupled to the coaxial transmission line via the antenna is provided. There is known a lighting device including a donut-shaped lamp surrounding a conductor or a lamp having a recess in which a tip portion of an inner conductor is buried (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 2001-102005 (page 3, FIG. 2) JP 2000-348684 A (3rd, 4th pages, FIGS. 1 and 3)

  In Patent Document 1 described above, a cylindrical external conductor is provided on the outer periphery of the internal conductor, a high frequency power source is connected to the external conductor, and the electric field is concentrated on the light emitting portion to increase the luminance. However, such a lamp has a problem that the luminous efficiency is not sufficient, and high luminance cannot be obtained with respect to the supplied energy.

  According to Patent Document 2, a coaxial resonator is provided in which an antenna is connected to a coaxial transmission line connected to a microwave generator and coupled to the coaxial transmission line via the antenna. The inner conductor provided in the coaxial resonator is considered as a discharge starting auxiliary body, and has a problem that the electric field cannot be efficiently concentrated in the lamp. In addition, there is a problem that the light emitting area is wide and it is difficult to become a point light source.

  An object of the present invention is to provide a microwave electrodeless lamp that has a long lifetime, high luminous efficiency, and high brightness, an illuminating device capable of instantaneous lighting and power saving, and a highly convenient projector equipped with the illuminating device. Is to provide.

  The microwave electrodeless lamp of the present invention is a microwave electrodeless lamp that emits light by irradiating a luminescent material with microwaves, and is made of a non-conductive material, and includes an enclosed space in which the luminescent material is enclosed, and an outer periphery. It is characterized by comprising a transparent container having a recess that goes around the portion and enters the inside of the enclosed space, and a conductor provided along the outer periphery of the recess.

  According to the present invention, the microwave electrodeless lamp (hereinafter sometimes simply referred to as a lamp) is provided with the conductor along the outer periphery of the recess that enters the enclosed space in which the luminescent material is enclosed. The electric conductor has a role equivalent to that of an antenna placed in an electromagnetic field, and the electric field component of the microwave can be concentrated on the central portion of the electric conductor to increase the luminous efficiency of the lamp.

  Furthermore, since the light emitting material emits strong light by concentrating the electric field in a region surrounded by the conductor by providing the conductor, the light emitting material approaches a point light source preferable in a projector described later.

  In addition, because the conductors are electrically independent, the lamp life is extended compared to conventional lamps with discharge electrodes or microwave lamps that directly apply an electric field to internal or external conductors. it can.

  Further, since the lamp of the present invention is not electrically connected to a lighting device to be described later, there are few restrictions on the support structure and the like, and there are advantages that the degree of freedom of the support structure and the arrangement position is high.

  Moreover, it is preferable that the said conductor consists of a ring-shaped electroconductive member provided along the outer peripheral part of the said hollow.

  In this way, by making the conductor a ring-shaped conductive member, microwaves from almost the entire circumference of the lamp can be concentrated at the center of the conductor, enabling a point light source and improving the luminous efficiency. Can be increased.

Moreover, it is preferable that the said conductor is divided | segmented in the middle of circulation.
Here, the form divided in the middle of circulation means, for example, a so-called C-ring having a gap part in the middle of circulation or a form in which the divided surfaces are in close contact with each other.

In this way, it is possible to easily manufacture the conductor, and it is easy to incorporate the conductor into the hollow of the transparent container, which contributes to cost reduction.
It should be noted that, when the conductor is in close contact with the dividing surface, the electric field concentration effect is the same as that of the conductor that is not divided, and in the form having a gap, the same level can be obtained by appropriately adjusting the distance of the gap. The electric field concentration effect can be obtained.

  Moreover, it is desirable that the conductor is composed of a plurality of conductive members provided along the outer periphery of the recess.

  Specifically, the conductor of the present invention is configured by disposing a plurality of conductive members divided into two or three along the outer periphery of the recess. That is, since a plurality of conductive members are arranged along the outer periphery of the recess and configured in a ring shape, the conductive member can be easily manufactured, and the shape of the recess is not limited.

  Moreover, it is preferable that the said conductor is a conductive film provided along the outer peripheral part of the said hollow.

  Even if the conductor is a conductive film, it has the same electric field concentration effect as the structure using the ring-shaped conductive member described above, and can form a conductor having a degree of freedom in the film formation pattern corresponding to the shape of the recess. There is an effect.

  Moreover, it is preferable that the said conductor consists of a coil which has the electroconductivity wound by the said hollow.

  If the conductor is a coil, the coil cross-sectional shape, thickness (cross-sectional area), number of turns, etc. can be freely set according to the desired electric field concentration effect. be able to.

  Further, the lighting device of the present invention is made of a non-conductive material, an enclosed space in which a luminescent substance is enclosed, a transparent container having a recess that goes around the outer periphery and enters the inside of the enclosed space, and the recess A microwave electrodeless lamp made of a conductor provided along the outer periphery of the electrode, and a microwave generator for irradiating the microwave electrodeless lamp with microwaves.

  According to the present invention, a high-luminance lighting device can be realized by using the above-described lamp having high luminous efficiency and inputting the same high-frequency incident power. That is, power saving can be achieved.

It is preferable that the microwave generation unit includes a solid high-frequency oscillation unit including a surface acoustic wave resonator and a waveguide unit.
Here, as the surface acoustic wave resonator, for example, a diamond SAW resonator is represented.

  The diamond SAW resonator has excellent frequency-temperature characteristics and can suppress frequency fluctuations with respect to temperature fluctuations, so that the microwave output can be stabilized during lighting. Therefore, stable luminance can be maintained. In addition, it is possible to efficiently irradiate the lamp with microwaves by the waveguide portion.

  The projector of the present invention is made of a non-conductive material, and includes a sealed space in which a luminescent material is sealed, a transparent container having a recess that goes around the outer periphery and enters the sealed space, A lighting device comprising: a conductor provided along an outer periphery; a microwave electrodeless lamp; and a microwave generation unit that irradiates the microwave electrodeless lamp with microwaves; and an emission from the lighting device A light modulation unit that modulates the light flux according to input image information to form an optical image, and a projection unit that projects the optical image formed by the light modulation unit. And

  According to the present invention, since the lighting device described above is employed, the lamp lighting timing is fast and the lamp starts up with high brightness, so that it is possible to wait until the image can be projected with the predetermined brightness after switch input as in the prior art. Time can be significantly reduced.

  Moreover, it becomes possible to repeat lighting and extinction within a short time, and there is an effect that the convenience for the user can be improved.

  Furthermore, compared with the projector provided with the illuminating device using the conventional discharge-type lamp, the lifetime of the illuminating device can be extended, the troublesomeness of replacing the illuminating device can be reduced, and the economic effect can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an illumination apparatus according to the present invention, FIGS. 5 to 9 show an embodiment of a lamp, and FIG. 10 shows a schematic configuration of a projector according to the present invention.
Note that the drawings referred to in the following description are schematic views in which the vertical and horizontal scales of members or portions are different from actual ones for convenience of illustration.
(Lighting device)

  FIG. 1 is a schematic diagram showing a schematic structure of a lighting device according to the present invention. In FIG. 1, the illumination device 60 includes a microwave generation unit 100, a light emitting unit 500, and an illumination case 80 as a shielding unit that houses the microwave generation unit 100 and the light emitting unit 500. The light emitting unit 500 includes the lamp 10, the reflector 71, the reflector 70, and the support unit 90.

The microwave generation unit 100 is arranged and connected to the back side of the reflector 70.
In general, a conventional frequency as a microwave band is 3 GHz to 30 GHz. In the present invention, a 300 MHz to 30 GHz band corresponding to a UHF band to an SHF band is defined as a microwave band.

  The reflector 71 is formed of a metal material that is a conductive material, and has a microwave reflecting surface 72 having a spherical curved surface. The reflector 71 is formed with a plurality of holes 73 having a diameter equal to or less than a quarter wavelength of the microwave (the illustration is simplified). Further, the spherical shape of the microwave reflecting surface 72 is configured so that the substantially central portion of the light emitting region 21 at the central portion of the lamp 10 is a focal point. The microwave reflecting surface 72 reflects microwaves. The plurality of holes 73 allow the light beam 500b reflected by the light beam reflecting surface 70a of the reflector 70 to pass therethrough.

  In addition, the shape of the microwave reflecting surface 72 may have a parabolic curved surface. In addition, the microwave reflecting surface 72 preferably has a parabolic curved surface in terms of light beam convergence, but it is advantageous to have a spherical curved surface in terms of manufacturing simplicity.

  The reflector 70 is made of quartz glass, and on the inner surface side, a light beam reflecting surface 70 a having a parabolic curved surface is formed opposite to the outer surface of the lamp 10. The light beam reflecting surface 70a is formed of a dielectric multilayer film that transmits microwaves and reflects light beams. The parabolic shape of the light beam reflecting surface 70 a is formed so that the substantially central portion of the light emitting region 21 of the lamp 10 installed on the inner surface side of the reflector 70 is focused. The shape of the light beam reflecting surface 70a may have a spherical curved surface.

  Here, the reflector 71 is fixed to the reflector 70 by engaging the open end of the reflector 71 with the open end of the reflector 70.

  The lamp 10 includes a transparent container 20 in which a luminescent material is accommodated, and a recess 26 formed so as to go around the outer periphery of the transparent container 20 and enter an enclosed space 21 (sometimes referred to as a light emitting region 21). And a conductor 30 made of a ring-shaped conductive member provided along the outer periphery. The lamp 10 is fixed to the inner bottom portion of the reflector 70 by the support portion 90. The detailed structure of the lamp 10 will be described in an embodiment described later.

  The support 90 is made of rod-shaped quartz glass, one end is joined to the convex region of the transparent container 20 of the lamp 10 substantially perpendicularly to the circumferential surface of the conductor 30, and the other end is supported and fixed to the reflector 70. ing. Thereby, the lamp | ramp 10 is supported in the predetermined position on the inner surface side of the reflector 70, and is fixed to the reflector 70 in the form protruded to the inner surface side.

  The lighting case 80 is installed in order to prevent the microwave from leaking outside the lighting device 60 and thereby adversely affecting the human body and surrounding electronic devices. For this reason, the illumination case 80 is formed using a conductive material (metal material) that shields microwaves.

  In the lighting case 80, a substantially circular hole 81 is formed on the surface facing the reflector 71 constituting the light emitting unit 500, and the edge of the hole 81 is an open end of the reflector 71. It is formed to be an inner surface having a curved surface similar to the outer surface. As a result, the illumination case 80 fixes the reflector 71 by fitting the open end of the reflector 71 into the hole 81. Therefore, the illumination device 60 has a configuration in which the reflector 71 of the light emitting unit 500 protrudes from the illumination case 80. The lighting case 80 houses the microwave generation unit 100 and the light emitting unit 500. In the present embodiment, the illumination case 80 and the reflector 71 prevent the microwave from leaking from the illumination device 60.

  Note that the illumination case 80 may be formed so as to have a mesh shape having a diameter equal to or less than ¼ wavelength of the wavelength of the microwave or a plurality of holes. Moreover, as long as the illumination case 80 can take the structure which shields a microwave, you may use another member.

  The microwave generation unit 100 generates a high-frequency signal and radiates it as a microwave toward the reflector 71 (the configuration of the microwave generation unit 100 will be described later). The emitted microwave is a substantially plane wave, passes through the light flux reflecting surface 70a of the reflector 70, and travels in the direction of the reflector 71. The microwave that reaches the reflector 71 is reflected by the microwave reflecting surface 72, and the reflected microwave converges on the light emitting region 21 at the center of the lamp 10. By the microwave focused on the light emitting region 21, the light emitting material to be enclosed is excited (and ionized) in the light emitting region 21 to emit plasma, whereby the light emitting region 21 emits light.

  When the light emitting area 21 of the lamp 10 emits light, a light flux is emitted. Part of the emitted light beam reaches the light beam reflecting surface 70a of the reflector 70 and is reflected. In the present embodiment, the light beam 500b reflected by the light beam reflecting surface 70a is a parallel light beam that is substantially parallel to the illumination optical axis L (illustrated by a one-dot chain line). Then, the light beam is emitted through a plurality of holes 73 formed in the reflector 71.

Next, the configuration of the microwave generator will be described with reference to the drawings.
FIG. 2 is a block diagram illustrating a schematic configuration of the microwave generation unit. In FIG. 2, the microwave generation unit 100 includes a solid-state high-frequency oscillation unit 110 that outputs a high-frequency signal, and a waveguide unit 150 that radiates the high-frequency signal output from the solid-state high-frequency oscillation unit 110 as a microwave. .

  The solid-state high-frequency oscillator 110 includes a power source 111, a surface acoustic wave (SAW) oscillator as a solid-state high-frequency oscillator, and a first amplifier 112. In this embodiment, a diamond SAW oscillator 202 is employed as the surface acoustic wave oscillator. The waveguide 150 includes an antenna 151 and an isolator 152 as a safety device.

  The solid high-frequency oscillator 110 will be described in detail. The power supply 111 supplies power to the diamond SAW oscillator 202 and the first amplifier 112. The subsequent stage of the diamond SAW oscillator 202 is connected to the previous stage of the first amplifier 112. The high-frequency signal output from the diamond SAW oscillator 202 is output after being amplified by the first amplifier 112. The high-frequency signal output from the first amplifier 112 becomes a high-frequency signal output from the solid-state high-frequency oscillator 110. In the present embodiment, the solid-state high-frequency oscillator 110 outputs a high-frequency signal (2.45 GHz band in the present embodiment) that is amplified to a high-frequency output level that excites the luminescent material enclosed in the lamp 10 to emit light.

  Next, the waveguide unit 150 will be described in detail. The waveguide unit 150 guides a high-frequency signal output from the solid-state high-frequency oscillation unit 110 and radiates it as a microwave 100a. The waveguide unit 150 includes an antenna 151 that radiates the microwave 100a and an isolator 152 as a countermeasure against reflected waves. ing.

  In this embodiment, the antenna 151 is configured as a patch antenna, and is a planar antenna that radiates microwaves having unidirectionality. The antenna 151 can radiate a substantially planar microwave 100a.

  The isolator 152 is installed between the antenna 151 and the subsequent stage of the first amplifier 112. Therefore, as a result of radiating the microwave 100a from the antenna 151, the reflected waves from the reflector 71, the lamp 10, the illumination case 80, and the like, which are objects, are prevented from returning to the solid high-frequency oscillator 110, and the reflected waves A failure of the one amplifier 112 or the like is prevented.

Next, the diamond SAW oscillator will be described with reference to the drawings.
FIG. 3 is a block diagram showing a schematic configuration of a diamond SAW oscillator as a solid-state high-frequency oscillator. In FIG. 3, the diamond SAW oscillator 202 forms a loop circuit 240 with the phase shift circuit 210, the diamond SAW resonator 310, the second amplifier 220, and the power distributor 230, and a buffer circuit is provided on one output side of the power distributor 230. 250 is connected.

  The phase shift circuit 210 receives a control voltage from the power supply 111 and varies the phase of the loop circuit 240. These blocks are all matched and connected to a constant characteristic impedance, specifically 50Ω. The diamond SAW resonator 310 is connected to the input side of the second amplifier 220 so that an input voltage at which the second amplifier 220 is saturated is supplied.

  Thereby, it is possible to directly oscillate a high frequency signal in the GHz band using the diamond SAW resonator 310. Further, the output power of the second amplifier 220 can be output from the power distributor 230 to the outside via the buffer circuit 250 while maintaining matching.

  With this circuit configuration, it is possible to continue the continuous oscillation state while minimizing the power applied to the diamond SAW resonator 310. In addition, the phase shift circuit 210 can apply frequency modulation to the high-frequency signal, and the microwave frequency can be variably adjusted for the lamp 10. The phase shift circuit 210 may not be used, and in that case, the solid-state high-frequency oscillator is a fixed oscillator that oscillates at a frequency uniquely determined by the characteristics of the diamond SAW resonator 310.

Next, characteristics of signals output from the diamond SAW oscillator will be described with reference to the drawings.
FIG. 4 is a graph showing the relationship between the frequency and intensity of the signal output from the diamond SAW oscillator. In FIG. 4, the horizontal axis indicates the frequency, and the vertical axis indicates the intensity of the output signal.

As a signal output from the diamond SAW oscillator 202, only a high-frequency signal (GHz band) having a specific frequency f ₁ is output. Further, as shown in FIG. 4, steep direct oscillation can be performed. In the present embodiment, the specific frequency f ₁ outputs a 2.45 GHz band high-frequency signal.

  Therefore, the lighting device 60 of the present invention described above includes the conductor 30 made of a ring-shaped conductive member along the outer periphery of the recess 26 that enters the enclosed space 21 in which the luminescent material is enclosed in the lamp 10. Therefore, the conductor 30 has a role equivalent to that of an antenna placed in an electromagnetic field, and the electric field component of the microwave can be concentrated at the center of the ring of the conductor 30 to increase the luminous efficiency of the lamp.

  Furthermore, since the light emitting material emits strong light by concentrating electric field components in a region surrounded by the conductor 30 by providing the conductor 30, the light emitting material approaches a point light source preferable for a projector described later.

  In addition, since the conductor 30 is electrically independent, the lamp has a longer life than a lamp having a conventional discharge electrode or a microwave lamp that directly applies a voltage to the internal conductor or the external conductor. Can be realized.

  Further, since the lamp 10 of the present invention is not electrically connected to a lighting device to be described later, there are advantages in that there are few restrictions on the support structure and the like, and the degree of freedom of the support structure and the arrangement position is high.

In addition, by using the diamond SAW oscillator 202 in the microwave generation unit 100, the output signal outputs only a high-frequency signal (GHz band) having a specific frequency f ₁ , and a steep direct oscillation can be performed. 10 can be turned on and turned off in a short time.

  Further, the diamond SAW oscillator 202 can adjust the excitation intensity without changing the frequency by the high frequency incident power, and therefore has an advantage that the light can be adjusted without changing the emission spectrum.

  Furthermore, the diamond SAW resonator 310 has excellent frequency-temperature characteristics and can suppress frequency fluctuations with respect to temperature fluctuations, so that the microwave output can be stabilized. Accordingly, it is possible to maintain a stable luminance when the lamp is lit.

In addition, the illumination device 60 of the present invention can realize a high-luminance illumination device with the same high frequency incident power by using a lamp with high luminous efficiency. That is, power saving can be achieved.
(Lamp structure)

Next, an example of a specific structure of the lamp 10 used in the lighting device 60 described above will be described with reference to the drawings.
(Example 1)

  5A and 5B show the structure of the lamp according to Example 1. FIG. 5A is a front view, and FIG. 5B is a plan view of a conductor (viewed from above in FIG. 5A). 5A and 5B, the lamp 10 includes a transparent container 20 formed of a non-conductive material, and an outer peripheral part of a recess 26 that goes around the outer peripheral part of the transparent container 20 and enters the enclosed space 21. And a ring-shaped conductor 30 provided along the line.

  The transparent container 20 is formed of quartz glass or transparent ceramics that is a non-conductive material. The transparent container 20 is formed with an enclosed space 21 (sometimes referred to as a light emitting region 21) filled with a light emitting material that emits light by microwaves. And the hollow 26 which goes around the outer periphery of the transparent container 20 is formed. As a result, the transparent container 20 has a substantially bowl-like shape constricted by the depression 26, and the inside of the depression 26 has a depth that goes into the inner side of most of the spherical region 20 a of the enclosed space 21. Yes.

The conductor 30 is made of a material having a small thermal expansion coefficient and high heat resistance. Specifically, a tungsten alloy or a stainless alloy is suitable. In FIG. 5, the cross section 30b of the conductor 30 has a circular shape, but the cross sectional shape may be a circle, an ellipse, or a quadrangle, and is not limited. Further, the inner side surface 30a of the conductor 30 may be in close contact with the outer peripheral portion of the recess 26 or may be separated. In the case of separation, the inner side surface 30 a is set to enter the inner side of the most spherical region 20 a of the enclosed space 21.
Since the lamp 10 configured as described above is in a state where the conductors 30 are electrically independent (non-powered state), the lamp 10 of the present invention has an electrodeless structure having no electrode.

  The transparent container 20 can be formed by heating a hollow sphere to a deformable temperature and fastening the band with a band having a cross-sectional shape of the recess 26. Further, when the difference between the outer diameter of the transparent container 20 and the inner diameter of the conductor 30 is small, the conductor 30 may be press-fitted into the transparent container 20. In this case, the conductor 30 may be heated for shrink fitting.

  Encapsulation of the luminescent material can be performed by providing a small through hole (not shown) in the transparent container 20 and encapsulating the luminescent material in the enclosed space 21 and then sealing with a sealing member.

  Moreover, as a luminescent substance enclosed with the enclosure space 21, mercury, a metal halide compound, etc. may be sufficient other than these gases, such as noble gases, such as neon, argon, krypton, and xenon.

  The lamp 10 is integrated with the conductor 30 fitted in the recess 26 of the transparent container 20, and is fixed to the reflector 70 by the support portion 90 (see FIG. 1).

The conductor 30 is provided for concentrating the electric field component of the microwave when irradiated with the microwave, has a role equivalent to an antenna placed in the electromagnetic field, and converts the electric field component of the microwave into the conductor. 30 in order to increase the luminous efficiency of the lamp by concentrating at the center of 30 (represented by a two-dot chain line E in the figure). Therefore, the electric field component is more concentrated in the central region of the conductor 30, so that the intensity of light emission is increased and the light emission is close to a point light source.
(Example 2)

Next, the structure of the lamp according to Example 2 will be described. The second embodiment is characterized in that the shape of the conductor is different from that of the first embodiment. The same parts as those in the first embodiment will be described with the same reference numerals.
FIG. 6 is a front view illustrating the structure of the lamp according to the second embodiment. In FIG. 6, the transparent container 20 is provided with a recess 26 similar to that of the first embodiment, and a conductor 30 is provided along the outer periphery of the recess 26.

  In FIG. 6, the conductor 30 is illustrated so as to be in close contact with the outer peripheral portion of the recess 26, but as a loose fitting relationship, a structure in which the conductor 30 rotates with respect to the transparent container 20 may be used.

  FIG. 7 illustrates the shape of the conductor 30 according to the second embodiment. 6A shows the conductor shown in FIG. 6, FIG. 6B shows the first modification, and FIG. 6C shows the second modification. First, the shape shown in FIG. In FIG. 7A, the conductor 30 has a C-ring shape that is divided midway around and has a gap 30c. The distance D between the divided surfaces of the gap 30c is set to an arbitrary size within a range that does not reduce the concentration of the electric field component of the microwave.

  The cross-section 30b of the conductor 30 is circular, but the cross-sectional shape may be circular, oval or square, and is not limited. Further, the inner side surface 30a of the conductor 30 may be in close contact with the outer peripheral portion of the recess 26 or may be separated. In the case of separation, the inner side surface 30 a is set to enter the inner side of the most spherical region 20 a of the enclosed space 21.

Then, the 1st modification of the conductor which concerns on Example 2 is demonstrated with reference to drawings.
In FIG. 7B, the conductor 30 sets the distance D of the gap 30c shown in FIG. 7A to “0”. That is, the dividing surface 30e is in close contact.

  In addition, the conductor 30 shown to Fig.7 (a), (b) can be integrated by winding a wire in the hollow 26 of the transparent container 20. FIG. Alternatively, the conductor 30 may be molded in advance as illustrated and fitted using the elasticity of the conductor 30. Alternatively, a method may be selected in which the conductor 30 is made into a shape that can be easily incorporated into the transparent container 20 with a shape memory alloy, and heated to a desired shape after incorporation.

  Next, a second modification of the conductor according to the second embodiment will be described. In FIG.7 (c), the conductor 30 is comprised by the electroconductive members 31 and 32 divided into two. Here, the conductive members 31 and 32 may be formed independently, or the ring-shaped conductor 30 may be cut and divided into two.

  Then, the conductive members 31 and 32 are mounted on the outer peripheral portion of the recess 26 of the transparent container 20. At this time, the gap portions 30 c and 30 d are provided between the conductive members 31 and 32. The size of the distance between the divided surfaces of each of the gap portions 30c and 30d may be the same or may be biased. For example, when the gap 30c is set to “0” and only the gap 30d is provided, the configuration is the same as that in FIG. Further, if both the gaps 30c and 30d are set to “0”, the same configuration as that in FIG. 7B is obtained.

  In the second modified example, the conductor 30 is illustrated as a two-body configuration of the conductive members 31 and 32. However, the conductive member may be configured as a three-body configuration or a more detailed configuration.

  As a method of fixing the conductive members 31 and 32 to the transparent container 20, it can be easily performed by bonding using a heat-resistant adhesive. Further, in the case of a two-body configuration, the conductive members 31 and 32 are formed in a horseshoe shape whose both end portions are slightly smaller than the outer shape of the recess 26, so that the conductive members 31 and 32 can be made conductive by utilizing the elasticity of the conductive members 31 and 32. It is possible to employ a structure in which the transparent container 20 is held in pressure contact with both ends of the elastic members 31 and 32.

Therefore, according to the second embodiment described above, the conductor 30 can be easily incorporated into the recess 26 of the transparent container 20, which contributes to cost reduction.
Further, in the second embodiment (including the first and second modified examples), the gap 30c and the distance between the divided surfaces of the gap 30c and the gap 30d are “0” in the same manner as the first embodiment. In an embodiment having a large electric field concentration effect and having a gap, the electric field component concentration effect at the same level can be obtained by appropriately adjusting the distance of the gap.

In the second modification, the conductive members 31 and 32 are disposed along the outer peripheral portion of the recess 26 and configured in a ring shape along the outer peripheral portion of the recess 26, so that the conductive members 31 and 32 are manufactured. In addition to this, there is an effect that the shape of the recess 26 is not limited.
(Example 3)

Next, the structure of the lamp according to Example 3 will be described. The third embodiment is characterized in that a conductive film is provided as a conductor, whereas the first and second embodiments are provided with a ring-shaped conductor. The transparent container 20 is common to the first and second embodiments.
FIG. 8 is a front view illustrating the structure of the lamp according to the third embodiment. In FIG. 8, the transparent container 20 is provided with a recess 26 similar to that of the first embodiment, and a conductive film 37 is provided along the outer periphery of the recess 26.

  The conductive film 37 is composed of a metal film having heat resistance. Specifically, tungsten, chromium, or an alloy thereof is used. Then, the conductive film 37 is formed on the outer peripheral surface of the recess 26 by film forming means such as vapor deposition or sputtering. The film formation range and thickness of the conductive film 37 are set by monitoring the effect of concentrating the electric field component of the microwave (monitoring as the light intensity).

Therefore, according to Example 3 described above, even if the conductor is the conductive film 37, the electric field component concentration effect is the same as the structure using the ring-shaped conductor according to Example 1 and Example 2 described above, There is an effect that a conductor can be formed corresponding to the shape of the recess 26.
Example 4

Next, a lamp according to Embodiment 4 of the present invention will be described with reference to the drawings. Example 4 is characterized in that a coil made of a conductive material is used as a conductor.
FIGS. 9A and 9B are cross-sectional views of the structure of the lamp according to the fourth embodiment when viewed from the front. In FIG. 9A, the lamp 10 is wound along the outer peripheral portion of the transparent container 20 formed of a non-conductive material and the recess 26 that goes around the outer peripheral portion of the transparent container 20 and enters the inside of the enclosed space 21. It is comprised from the coil 41 rotated.

  The transparent container 20 is provided with a recess 26 in a range where the coil 41 is mounted, and the outer peripheral shape of the recess 26 has a gentle arc. The coil 41 is wound along the outer periphery of the recess 26.

  The coil 41 is provided for concentrating the electric field component of the microwave when irradiated with the microwave, and concentrating the electric field component of the microwave on the central portion of the coil (represented by a two-dot chain line E in the figure). Increase the luminous efficiency of the lamp.

  In addition, the coil 41 may be in close contact with the transparent container 20 or slightly separated as long as it is within the formation range of the recess 26, and is biased toward one outer end portion of the coil separated from the transparent container 20. You may arrange in a position. The coil wire cross-sectional shape of the coil 41 may be a circle, a square, a flat rectangle, a triangle, a hexagon, a trapezoid, or an ellipse.

Next, a modification of the fourth embodiment will be described with reference to the drawings.
FIG. 9B is a cross-sectional view showing a modification of the fourth embodiment. In the transparent container 20, the bottom of the recess 26 is linearly formed. A coil 41 is wound around the recess 26. Since the bottom of the recess 26 is linear, the coil 41 may be a simple coil having a constant winding outer diameter.

  In addition, the coil 41 can be shape | molded previously as shown in FIG. 9, and can be engage | inserted in the transparent container 20 using the elasticity of a coil. Or you may wind the coil 41 along the outer peripheral part of the hollow 26 of the transparent container 20. FIG.

  In FIG. 9, the coil 41 has four turns, but the number of turns is not limited to four and may be more or less. Further, in this embodiment, Cu is adopted as the material of the coil 41, but it is not limited to Cu as long as it is a conductive material and a material having high heat resistance.

Therefore, according to the fourth embodiment described above, by using the coil 41 as the conductor, the coil cross-sectional shape, thickness (cross-sectional area), number of turns, etc. can be set freely in accordance with the desired electric field component concentration effect. It is possible, and it is easy to manufacture, and a material can also be selected suitably.
(projector)

Next, a projector to which the above-described illumination device is applied will be described with reference to the drawings.
FIG. 10 is a block diagram showing a schematic configuration of the projector of the present invention. In FIG. 10, the projector 400 includes the illumination device 60 and the optical system 410 described above.
The optical system 410 includes an illumination optical system 460, a light modulation unit 470, a color synthesis optical system 480, and a projection unit 490. The illumination device 60 includes a microwave generation unit 100 and a light emitting unit 500.

  Next, the operation of the projector 400 will be described. Microwaves are emitted from the microwave generation unit 100, and the light emitting unit 500 emits light by the microwaves emitted from the microwave generation unit 100. Further, the illumination optical system 460 makes the illuminance of the light beam emitted from the illumination device 60 uniform and separates it into each color light. The light modulation unit 470 modulates the light beams of the respective color lights separated by the illumination optical system 460 according to image information to form an optical image. The color synthesis optical system 480 combines the optical images of the respective color lights separated by the illumination optical system 460 and modulated by the light modulation unit 470, and projects the optical image by the projection unit 490. In addition, the illuminating device 60 unitizes the microwave generation unit 100 and the light emitting unit 500 while shielding the microwaves by the illumination case 80 (see FIG. 1).

  Since the projector 400 of the present invention is equipped with the lighting device 60 described above, the lamp lighting timing is early and the projector 400 rises with high brightness. Therefore, the projector 400 has a switch input more than a projector equipped with a conventional lighting device using a discharge lamp. Then, the waiting time until an image can be projected with a predetermined brightness can be significantly reduced.

  In addition, the time required for turning off the light can be shortened, and it becomes possible to repeat the turning on and off in a short time, thereby improving the convenience.

  Further, the lamp 10 to be mounted is a microwave electrodeless lamp, which realizes a longer life of the lighting device 60 and troublesome replacement of the lighting device as compared with a projector having a lighting device using a conventional discharge lamp. The economic effect can be improved.

It should be noted that the present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved.
For example, in the embodiment described above, the lamp 10 is fixed to the lighting device 60 via the support portion 90. However, the columnar protrusion is protruded from the transparent container 20 and fixed directly to the reflector 70. It is good also as a structure to do.

  Moreover, although the microwave electrodeless lamp 10 and the illumination device 60 described in the above-described embodiment are applied as light sources of the projector 400, the projector is not limited to the front projector but is also applied to the rear projector. it can. In addition, the small and lightweight lighting device may be applied to other optical devices, and can be suitably applied to lighting devices such as aviation, ships, vehicles, and indoor lighting devices.

The schematic diagram which shows schematic structure of the illuminating device which concerns on embodiment of this invention. The block diagram which shows schematic structure of the microwave generation part which concerns on embodiment of this invention. 1 is a block diagram showing a schematic configuration of a diamond SAW oscillator according to an embodiment of the present invention. The graph which shows the relationship between the frequency and intensity | strength of the signal output from a diamond SAW oscillator. The structure of the lamp | ramp which concerns on Example 1 of this invention is shown, (a) is a front view, (b) is a top view. The front view which shows the structure of the lamp | ramp which concerns on Example 2 of this invention. The top view which shows the shape of the conductor which concerns on Example 2 of this invention. The front view which shows the structure of the lamp | ramp which concerns on Example 3 of this invention. Sectional drawing which looked at the structure of the lamp | ramp which concerns on Example 4 of this invention from the front. 1 is a block diagram showing a schematic configuration of a projector according to the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Microwave electrodeless lamp (lamp), 20 ... Transparent container, 21 ... Enclosing space (light emission area | region), 26 ... Depression of a transparent container, 30 ... Conductor.

Claims (9)

A microwave electrodeless lamp that emits light by irradiating a luminescent material with microwaves,
A non-conductive material, a sealed space in which a luminescent substance is enclosed, and a transparent container having a recess that goes around the outer periphery and enters the inside of the enclosed space;
A conductor provided along the outer periphery of the depression;
A microwave electrodeless lamp characterized by comprising: The microwave electrodeless lamp according to claim 1,
The microwave electrodeless lamp, wherein the conductor is made of a ring-shaped conductive member provided along an outer peripheral portion of the recess. The microwave electrodeless lamp according to claim 2,
The microwave electrodeless lamp, wherein the conductor is divided in the course of circulation. The microwave electrodeless lamp according to claim 1,
The microwave electrodeless lamp, wherein the conductor is composed of a plurality of conductive members provided along an outer peripheral portion of the recess. The microwave electrodeless lamp according to claim 1,
The microwave electrodeless lamp, wherein the conductor is a conductive film provided along an outer peripheral portion of the depression. The microwave electrodeless lamp according to claim 1,
The microwave electrodeless lamp, wherein the conductor is made of a conductive coil wound around the depression. An encapsulated space made of a non-conductive material, in which a luminescent substance is encapsulated, a transparent container having a recess that goes around the outer periphery and enters the interior of the encapsulated space, and a conductive provided along the outer periphery of the recess A microwave electrodeless lamp comprising a body,
A microwave generator for irradiating the microwave electrodeless lamp with microwaves;
An illumination device comprising: The lighting device according to claim 7.
The illumination device, wherein the microwave generation unit includes a solid-state high-frequency oscillation unit including a surface acoustic wave resonator and a waveguide unit. An encapsulated space made of a non-conductive material, in which a luminescent substance is encapsulated, a transparent container having a recess that goes around the outer periphery and enters the interior of the encapsulated space, and a conductive provided along the outer periphery of the recess A microwave electrodeless lamp composed of a body, and a microwave generator for irradiating the microwave electrodeless lamp with microwaves, and an illumination device comprising:
A light modulation unit that modulates a light beam emitted from the illumination device according to input image information to form an optical image, a projection unit that projects an optical image formed by the light modulation unit, and
A projector comprising:

Images