JP2001210489A - Microwave discharge light source device and picture display device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable electron to emit light in a electrode-less lamp with ease. SOLUTION: The microwave discharge light source device 10 characterized by the construction which comprises a magnetron 16 generating microwave; a resonator 11 with an opening part 11a1 emitting light while making microwave resonate; an electrode-less lamp 14 constructed integrally with first lamp part 14a mounted in the resonator, sealing rare gas 15a and discharging media 15b inside, discharging by dint of the microwave, formed in lengthened shape turning its longitudinal direction toward the opening, and the second lamp part 14b sealing only the rare gas 15a discharging by din of microwave, formed so as to cover the longitudinal peripheral part of the first lamp part, and magnetic force generating means 12, 13 generating lines of magnetic force parallel to the longitudinal direction of the first lamp part of the electrode-less lamp and the direction of the light emitted from the electrode less lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microwave discharge light source device for exciting a discharge medium in an electrodeless lamp by microwaves, and an image display device using the microwave discharge light source device.

[0002]

2. Description of the Related Art Conventionally, a known microwave discharge light source device having no electrode has been used as a device for irradiating a wide range such as a lighting device, so that there is no problem even if the light emitting portion is wide to some extent. However, in recent years, it has been considered that a microwave discharge light source device is used as a light source for an image display device, and it has become necessary to control the light beam by an optical system. It was not possible to achieve high brightness by converging. As a means for solving this problem, a mask having a small opening area is provided on the side of the emitted light emitted from the lamp. However, since the lamp emits light uniformly as a whole, the amount of light emitted from the opening is one of those. Parts, which are extremely inefficient.

Further, as shown in FIG.
The microwave discharge light source device disclosed in JP 83008 is an example of a method using electron cyclotron resonance.

A microwave discharge light source device 100 as an example of a conventional example shown in FIG. 11 includes a microwave oscillator 101 for oscillating microwaves,
1. A waveguide 102 for guiding the microwave oscillated in 1; a cylindrical microwave resonance cavity 104 connected to the waveguide 102 through a feed port 103 and having an opening 104a formed on the front side; A hollow spherical lamp vessel 105 which is provided in a microwave resonance cavity 104 and contains therein a discharge luminescent substance which is excited by microwaves and emits light by discharge, and a power supply device 10
6 and an electromagnet or a permanent magnet 107 for applying a magnetic field.

The microwave oscillated from the microwave oscillator 101 travels through the waveguide 102 and is supplied to the power supply port 103.
Is supplied to the inside of the microwave resonance cavity 104, and when the discharge light-emitting substance in the lamp vessel 105 is excited by the microwave to discharge and emit light, the magnetic field line 107a of the magnetic field by the electromagnet or the permanent magnet 107 is substantially in the traveling direction of the microwave. Since the electrons are generated in parallel, the magnetic field causes electrons existing in the lamp vessel 105 to generate a helical rotational motion as shown in FIG. 12, and so-called electron cycloton resonance occurs. Thereafter, the light emitted and discharged in the lamp vessel 105 has a longer light emission path (distance) and light emission period than the case where no magnetic field is applied, as much as the light rotates in a spiral manner,
The emitted light is applied to the opening 10 of the microwave resonance cavity 104.
4a.

[0006]

By the way, according to the conventional microwave discharge light source device 100 shown in FIG. 11, as described above, the light emission path and the light emission path correspond to the rotation of the electrons in the lamp vessel 105. Although the light emission period becomes longer and the opportunity to emit light increases, the shape of the lamp vessel 105 is a hollow spherical shape, so that the rotational motion path cannot be increased unless the ball diameter of the lamp vessel 105 is increased.
If the spherical diameter of the lamp vessel 105 is increased, the light emitting portion becomes large, and the microwave discharge light source device 10
0 also becomes large.

Also, since the opening area of the opening 104a opened in front of the microwave resonance cavity 104 is large, it is small enough to be used as a point light source when used in an image display device and the like, and a high-luminance light emitting source is used. There are problems such as being unable to be.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a first invention is a magnetron for generating a microwave, and an aperture for resonating the microwave and emitting light. And a resonator provided in the resonator, and enclosing a rare gas and a discharge medium discharged by the microwave and forming a longitudinal direction elongated toward the opening side. An electrodeless lamp integrally formed of one lamp part, a second lamp part enclosing only the rare gas discharged by the microwave and covering the longitudinal outer peripheral part of the first lamp part; A microwave discharge light source device comprising: a magnetic force generating means for generating a magnetic line of force parallel to a longitudinal direction of a first lamp portion of an electrode lamp and an emission direction of light emitted from the electrodeless lamp.

A second invention provides a magnetron for generating a microwave, a resonator having an opening for emitting the light while resonating the microwave, and a resonator provided in the resonator, A first lamp section in which the longitudinal direction is elongated toward the opening side by enclosing a rare gas and a discharge medium discharged by the microwave, and only a rare gas discharged by the microwave; An electrodeless lamp integrally formed with a second lamp portion covering an outer circumferential portion of the first lamp portion in a longitudinal direction, and a longitudinal direction of the first lamp portion of the electrodeless lamp and an output from the electrodeless lamp. Magnetic force generating means for generating a magnetic line of force parallel to the emission direction of the emitted light, and a loop gap resonator provided on the optical axis of the light emitted from the electrodeless lamp and having both electromagnetic inductive properties and electric capacitance. A microwave discharge light source apparatus characterized by equipped.

According to a third aspect, in the microwave discharge light source device according to the second aspect, the loop gap resonator is formed in a substantially tubular shape, and the inner diameter of the loop gap resonator is the same as that of the microwave discharge light source device. It is characterized in that it is smaller than the lamp diameter of the first lamp part of the electrode lamp.

According to a fourth aspect of the present invention, in the microwave discharge light source device according to any one of the first to third aspects of the present invention, the opening formed in the resonator is formed with respect to a direction of the magnetic field lines. It is characterized by being opened substantially vertically.

According to a fifth aspect of the present invention, in the microwave discharge light source device according to any one of the first to fourth aspects, the magnetic force generating means generates the magnetic lines of force using a permanent magnet. It is characterized by the following.

According to a sixth aspect of the present invention, in the microwave discharge light source device according to any one of the first to fourth aspects, the magnetic force generating means generates the magnetic field lines by using an electromagnetic coil. It is characterized by the following.

Further, the seventh invention is characterized in that the first to sixth aspects described above.
In any one of the microwave discharge light source devices according to the invention,
An opening area of the opening formed in the resonator is smaller than a lamp diameter of the electrodeless lamp.

Further, an eighth aspect of the present invention relates to the first to seventh aspects.
An image display device using any one of the microwave discharge light source devices according to the invention as a projection light source for image display.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a microwave discharge light source device according to the present invention and an image display device using the microwave discharge light source device will be described below with reference to FIGS. >, <Second embodiment>, and <Third embodiment> in this order.

<First Embodiment> FIG. 1 is a sectional view showing a microwave discharge light source device according to a first embodiment of the present invention, and FIG. 2 is a microwave discharge light source device according to the first embodiment shown in FIG. FIG. 3 is a view for explaining the rotational movement of electrons generated in the electrodeless lamp under the influence of a magnetic field. FIG. 3 is a cross-sectional view showing a first modification in which the microwave discharge light source device of the first embodiment is partially modified. FIGS. 4A and 4B are sectional views showing a second modified example in which the microwave discharge light source device of the first embodiment is partially modified.

As shown in FIG. 1, in the microwave discharge light source device 10A according to the first embodiment of the present invention, the resonator 11 is formed into a stepped cylindrical shape with a small diameter portion 11a and a large diameter portion 11b. . In the embodiment, the resonator 11 is formed in a stepped cylindrical shape. However, the present invention is not limited to this, and may be a simple cylindrical shape or a box shape. The small-diameter portion 11a of the resonator 11 has an opening 11a having an open end.
A pair of permanent magnets 12 and 13 having a crescent cross section are fixed to each other along the inner diameter of the small-diameter portion 11a. In the embodiment, the permanent magnets 12, 1
Although a pair of 3 is provided to face each other, the present invention is not limited to this, and only one of them may be provided. Further, a donut-shaped (ring-shaped) permanent magnet may be used, or an electromagnet may be used instead of the permanent magnet.

An electrodeless lamp 14 is provided between the pair of permanent magnets 1 on the side of the opening 11a1 in the small diameter portion 11a of the resonator 11.
It is fixed inside 2 and 13. This electrodeless lamp 1
Reference numeral 4 denotes a main part of the first embodiment, in which both ends are formed in a hemispherical shape using transparent quartz glass and the longitudinal direction is formed in a long cylindrical shape toward the opening 11a1 side. A first lamp 14a in which a rare gas 15a and a discharge medium 15b discharged by microwaves are sealed, and an elliptical shape formed of transparent quartz glass and covering an outer circumferential portion of the first lamp portion 14a in the longitudinal direction. Lamp 14b in which only rare gas 15a discharged by microwave is sealed
And are formed integrally.

At this time, the first lamp 1 of the electrodeless lamp 14
4a, a rare gas 15 discharged by microwaves is provided.
a is filled with argon, neon, xenon, krypton, etc., and is filled with a metal halide such as gallium, indium, thallium, mercury, zinc, sulfur, selenium, tellurium, etc. as a discharge medium 15b discharged by microwaves. ing. On the other hand, the second lamp 14b of the electrodeless lamp 14 is filled with argon, neon, xenon, krypton, or the like as a rare gas 15a discharged by microwaves. The electrodeless lamp 14 is configured so that the outer second lamp 14b can start discharging before the inner first lamp 14a as described later.
The gas pressure and gas volume of the rare gas 15a in 4b are set. Of course, the first and second lamp portions 1 of the electrodeless lamp 14
Since there are no electrodes in 4a and 14b, the life can be extended. In the embodiment, the first electrodeless lamp 14
Although both ends of the lamp portion 14a are formed in a hemispherical shape, the present invention is not limited to this, and both ends may be formed flat, and the end on the side other than the light emission side may be formed as a protrusion.

At this time, by filling or sintering a dielectric ceramic (not shown) between the pair of permanent magnets 12 and 13 and the electrodeless lamp 14, the electrodeless lamp 14 is interposed between the pair of permanent magnets 12 and 13. It is fixed in the small diameter portion 11a of the resonator 11.

When the pair of permanent magnets 12 and 13 are mounted in the small-diameter portion 11a of the resonator 11, the lines of magnetic force 12a and 13 generated from the pair of permanent magnets 12 and 13 respectively.
The magnets 12 and 13 are arranged such that the direction of “a” is parallel to the longitudinal direction of the first lamp portion 14 a of the electrodeless lamp 14 and the emission direction (arrow direction) of the light L emitted from the electrodeless lamp 14.
S pole and N pole are set respectively.

A magnetron 16 for generating microwaves is attached to the outside of the bottom surface 11b1 of the large diameter portion 11b of the resonator 11. In addition, magnetron 16
An antenna 17 for transmitting the microwave generated in the above-described manner projects into the large-diameter portion 11 b of the resonator 11. As a result, the microwave transmitted from the antenna 17 resonates in the large-diameter portion 11b of the resonator 11, and feeds the resonated microwave into the electrodeless lamp 14.

In the electrodeless lamp 14, first, the noble gas 15a in the second lamp portion 14b starts discharging due to the resonated microwaves to be in a plasma state, thereby lowering the impedance in the second lamp portion 14b. . Along with this, the microwave tends to concentrate on the first lamp portion 14a, so that the rare gas 15a in the first lamp portion 14a is discharged to be in a plasma state, and the power entering the entire electrodeless lamp 14 increases, First lamp part 1 of electrodeless lamp 14
The temperature of the glass wall of the first lamp unit 14a rises.
The metal in the discharge medium 15b encapsulated therein evaporates, dissociates and condenses in a high temperature part to become particles, and the particles emit a spectrum specific to the metal by heating of the discharge. These particles move to the low-temperature part in the first lamp part 14a of the electrodeless lamp 14,
After metallization by reaction with hydrogen and oxygen, evaporation, dissociation,
Repeats condensation and light emission.

Here, the direction of the lines of magnetic force 12a, 13a generated from the pair of permanent magnets 12, 13, respectively, is the longitudinal direction of the first lamp portion 14a of the electrodeless lamp 14, and the emission of the emitted light L from the electrodeless lamp 14. Since it is parallel to the direction (the direction of the arrow), electron cyclotron resonance occurs depending on the direction of the lines of magnetic force 12a and 13a, and the electrodeless lamp 1
4 generated in the first lamp portion 14 a
As shown in FIG. 2, the light L is helically rotated between the lines of magnetic force 12 a and 13 a toward the emission direction on the side of the opening 11 a formed in the small diameter portion 11 a of the resonator 11. The light is emitted from the formed opening 11a. At this time, the turning radius (Larmor radius) of the electrons generated in the first lamp portion 14a of the electrodeless lamp 14 is the same as that of the electrodeless lamp 1.
4 is sufficiently smaller than the lamp diameter φD of the first lamp portion 14a, and the light emitting path (distance) and the light emitting period of light can be made extremely long by the helical rotational movement of the electrons. The distance until the energy is lost by colliding with the lamp wall of the portion 14a can be lengthened, and the energy of the microwaves consumed by colliding with the lamp wall when electrons are freely moving can be efficiently used. You can do it.

Since electron cyclotron resonance is more likely to occur as the magnetic flux density is higher, a pair of permanent magnets 12 and 13 are formed so that lines of magnetic force parallel to the longitudinal direction of the first lamp portion 14a of the electrodeless lamp 14 are formed. Electrodeless lamp 1
By arranging the electrode lamps 4 therebetween, the magnetic flux density becomes high near the center of the first lamp portion 14a of the electrodeless lamp 14 in the longitudinal direction, and the columnar lamp 14 emits light strongly. The emitted light is extracted from the hemispherical end of the first lamp portion 14a of the electrodeless lamp 14 as emitted light L. Here, the resonator 11
The opening 11a formed in the small diameter portion 11a is
By opening substantially perpendicularly to the directions of a and 13a, the opening 11a takes a cross section substantially perpendicular to the luminous flux of the emitted light L, and a point light source having a bright central portion of the emitted light L and a small area is obtained. Can be

Next, a first modified example in which the microwave discharge light source device 10A of the first embodiment shown in FIG. 1 is partially modified will be briefly described with reference to FIG. In FIG. 3, the same reference numerals are given to the same components as those of the microwave discharge light source device 10A of the first embodiment described above,
In the following description, only differences from the microwave discharge light source device 10A of the first embodiment described above will be described.

As shown in FIG. 3, in the microwave discharge light source device 10B of the first modified example, the small diameter portion 11a of the resonator 11
The electrodeless lamp 14 is provided in the opening 11a1
By attaching a lid 18 having a central hole 18a having a diameter sufficiently smaller than the lamp diameter φD of the first lamp portion 14a and having a diameter of about 1 mm or less, the emitted light L emitted from the central hole 18a becomes a clearer point light source. Thus, even if the opening area of the center hole 18a is small, the emitted light L can be efficiently extracted. Further, by using a metal material for the lid 18 having the center hole 18a formed therein, or by using a combination of a wire mesh and a light shielding member, an effect of preventing leakage of microwaves to the outside can be obtained.

Next, a second modified example in which the microwave discharge light source device 10A of the first embodiment shown in FIG. 1 or the microwave discharge light source device 10B of the first modified example is partially modified is shown in FIG.
This will be briefly described with reference to FIG. In FIG. 4, the same reference numerals are given to the same components as those of the microwave discharge light source devices 10A, 10B described above, and in the following description, the microwave discharge light source devices 10A, 10A, 10
Only the differences from B will be described. Further, in FIG. 4, the lid 18 having the center hole 18a of about 1 mm or less is attached to the tip of the small diameter portion 11a of the resonator 11, but in the second modified example, the lid 18 may be attached as needed. Shall be.

Here, in the microwave discharge light source device 10A of the first embodiment or the microwave discharge light source device 10B of the first modified example, the temperature of the electrodeless lamp 14 is approximately 500 ° C. to 1000 ° C. by the microwave. Since the temperature is increased to C, the pair of permanent magnets 12 and 13 provided in the small-diameter portion 11a of the resonator 11 have extremely reduced magnetization intensity due to high heat from the electrodeless lamp 14. Of course, the permanent magnet 12,
Even when an electromagnet is used without using 13, the demagnetization is performed in the same manner as described above.

Therefore, as shown in FIG. 4, in the microwave discharge light source device 10C of the second modification, the crescent-shaped permanent magnets 12, 13 are not shown facing each other outside the small diameter portion 11a of the resonator 11. A pair is held using a holding member. In the second modified example, the pair of permanent magnets 12 and 13 are provided so as to face each other. However, the present invention is not limited to this, and only one of them may be used. Further, a donut-shaped (ring-shaped) permanent magnet may be used, or an electromagnet may be used instead of the permanent magnet.

Here, when the pair of permanent magnets 12 and 13 are provided outside the small-diameter portion 11a of the resonator 11, at least the small-diameter portion 11a of the resonator 11 is formed using a material having a small relative magnetic permeability. Alternatively, by using a conductive mesh material, the influence of high heat from the electrodeless lamp 14 can be reduced and the magnetic lines of force 12a and 13a can be concentrated.

The microwave discharge light source device 1 having the above configuration
For 0A (or 10B or 10C), the life can be prolonged by the electrodeless lamp 14, and the rare gas 15a and the discharge medium 15b are sealed in the first lamp portion 14a inside the electrodeless lamp 14. By enclosing only the noble gas 15a in the outer second lamp portion 14b constituting the electrode lamp 14, first, the noble gas 15a in the second lamp portion 14b starts discharging due to the resonated microwaves and becomes a plasma state. As a result, the impedance in the second lamp section 14b is reduced, and accordingly, the microwaves are easily concentrated on the first lamp section 14a, and the first lamp section 1
Electrons are easily emitted within 4a, and a spectrum specific to a metal can be emitted. The longitudinal direction of the first lamp portion 14a of the electrodeless lamp 14 and the electrodeless lamp 14
Lines of magnetic force 12a, 13 parallel to the direction of emission of light L emitted from
is given to the electrodeless lamp 14 to extend the light emission path (distance) and the light emission period of the light, thereby increasing the discharge efficiency in the emission direction of the emitted light L, increasing the brightness, and increasing the emitted light L from a small area.
Is emitted, the emitted light L from the electrodeless lamp 14 is emitted.
Can be used as a point light source.

<Second Embodiment> FIG. 5 is a sectional view showing a microwave discharge light source device of a second embodiment according to the present invention, and FIG. 6 is a partially modified microwave discharge light source device of the second embodiment. FIG. 7 is a sectional view showing a first modification, FIG. 7 is a sectional view showing a second modification in which the microwave discharge light source device of the second embodiment is partially modified, and FIG. FIG. 3 is an enlarged perspective view showing a loop gap resonator in the wave discharge light source device.

A microwave discharge light source device 20A according to the second embodiment of the present invention shown in FIG. 5 and a microwave discharge light source device 20B according to a first modification obtained by partially modifying the second embodiment shown in FIG. A microwave discharge light source device 20C according to a second modified example in which the second embodiment illustrated in FIG. 7 is partially modified is the same as the microwave discharge light source device 10 according to the first embodiment described above.
A, 10B, and 10C respectively correspond to each other. Here, the microwave discharge light source devices 10A, 10A,
Only different points from 10B and 10C will be described with new reference numerals.

In the microwave discharge light source device 20A (or 20B or 20B) shown in FIG. 5 (or FIG. 6 or FIG. 7), the light of the electrodeless lamp 14 provided in the small diameter portion 11a of the resonator 11 is On the emission side, on the optical axis K of the lamp 14, a tubular loop gap resonator 21 which is a main part of the second embodiment is provided. At this time, the center axis of the loop gap resonator 21 is set to the optical axis K of the electrodeless lamp 14.
, The central axis direction of the loop gap resonator 21 becomes parallel to the emission direction (the direction of the arrow) of the emitted light L from the electrodeless lamp 14, and the loop gap resonator 21
Is provided substantially orthogonal to the optical axis K of the electrodeless lamp 14. In the embodiment, the loop gap resonator 21
Is provided on the light emission side of the electrodeless lamp 14, but may be provided at both ends of the electrodeless lamp 14.

The circular loop gap resonator 21
Is filled with dielectric ceramics (not shown) between the outer peripheral portion of the electrodeless lamp 14 and the outer peripheral portion of the electrodeless lamp 14 and / or the inner peripheral portions of the pair of permanent magnets 12 and 13. And a structure having the same resonance frequency as the resonator 11. Further, the loop gap resonator 21 employs a structural form having both electromagnetic induction and electric capacitance as described later.

That is, as shown in an enlarged manner in FIG. 8, the loop gap resonator 21 includes a substantially tubular resonance ring portion 21a made of a conductive material such as copper, aluminum, and silver, and the resonance ring portion 21a. A gap 21b, which is partially cut away with a small width, has an inner diameter φd of the resonance ring 21a.
4 is smaller than the lamp diameter φD of the first lamp portion 14. In the embodiment, one gap portion 21b is formed in the tubular resonance ring portion 21a. However, the present invention is not limited to this.
It is also possible to form a loop b and fill each gap portion 21b with a dielectric ceramic and hold it, thereby forming an electromagnetic loop.

Here, when the center axis direction of the loop gap resonator 21 is arranged so as to be parallel to the direction of the magnetic flux of the fluctuating electromagnetic field, since the resonance ring 21a has electromagnetic inductive properties, a spiral induced potential in the circumferential direction is obtained. Is generated, which causes a gap 2
An electric field is generated in 1b to have electric capacitance.

Accordingly, the microwave discharge light source device 20A
In (or 20B or 20C), the microwave energy is efficiently guided into the electrodeless lamp 14 by the loop gap resonator 21 to increase the discharge efficiency in the emission direction of the light L emitted from the electrodeless lamp 14 and increase the discharge efficiency. By emitting the emitted light L from a small area with reduced brightness, the electrodeless lamp 1
4 can be used as a point light source.

<Third Embodiment> FIG. 9 is a structural view showing a transmission type image display device using a microwave discharge light source device according to the present invention, and FIG. 10 is a microwave discharge light source device according to the present invention. FIG. 2 is a configuration diagram showing a case of a reflection type as an image display device using the image display device.

First, as shown in FIG. 9, the transmission type image display device 30 is the same as the microwave discharge light source devices 10A to 10C in the first embodiment (or the second embodiment) described above.
(Or 20A to 20C), the emitted light L emitted from the electrodeless lamp 14 constituting the
2 is irradiated. The transmissive liquid crystal plate 32 displays a desired image according to an image signal from the liquid crystal drive circuit 33. The image light G transmitted through the transmissive liquid crystal plate 32 is enlarged by a projection lens 34 and is enlarged and projected on a screen 35.

Therefore, by using the microwave discharge light source devices 10A to 10C (or 20A to 20C) described above, the discharge efficiency is increased in the emission direction of the emission light L of the electrodeless lamp 14, the brightness is increased, and the area is reduced. By emitting the emitted light L, the emitted light L from the electrodeless lamp 14 can be used as a point light source, so that the light source for projection of the transmissive image display device 30 has low power consumption and high brightness of the image. / High-quality / High-definition enlarged projection.

Next, as shown in FIG. 10, in the reflection type image display device 40, one surface 41a of the light address type spatial modulation element 41 is irradiated with the writing light W corresponding to the image signal, and the optical information is written. Written and this optical information is amplified internally.

On the other hand, the first embodiment (or the second
Example 10) Microwave discharge light source devices 10A to 10A to 10
Electrodeless lamp 14 constituting C (or 20A to 20C)
Outgoing light L emitted from the infrared cut filter 42,
The light enters the polarization beam splitter 45 through the lens 43 and the wavelength filter 44, is reflected by the semi-transmissive reflection film 45 a of the polarization beam splitter 45, and is reflected by the other side of the optically addressed spatial modulation element 41. The light is emitted to the surface 41b, and is reflected as read light R including image information on the other surface 41b. Thereafter, the readout light R including the image information is transmitted through the transflective film 45a of the polarization beam splitter 45, is enlarged by the projection lens 46, and is enlarged and projected on the screen 47.

Accordingly, by using the microwave discharge light source devices 10A to 10C (or 20A to 20C) described above, the discharge efficiency is increased in the emission direction of the emission light L of the electrodeless lamp 14, the brightness is increased, and the area is reduced. By emitting the emitted light L, the emitted light L from the electrodeless lamp 14 can be used as a point light source, so that it consumes low power as a light source for projection of the reflection type image display device 40 and has high brightness of an image. / High-quality / High-definition enlarged projection.

[0047]

In the microwave discharge light source device according to the present invention described in detail above, according to the first aspect, the life of the electrodeless lamp can be extended, and the inner side constituting the electrodeless lamp can be achieved. The first lamp portion is filled with a rare gas and a discharge medium, and the outer second lamp portion constituting the electrodeless lamp is filled with only a rare gas. The gas starts discharging and becomes a plasma state, thereby lowering the impedance in the second lamp section. As a result, microwaves are easily concentrated on the first lamp section, and electrons are emitted in the first lamp section. This makes it easier to emit a spectrum specific to a metal. In addition, the first lamp portion of the electrodeless lamp and the lines of magnetic force parallel to the emission direction of the light emitted from the electrodeless lamp are given to the electrodeless lamp to lengthen the light emission path (distance) and the light emission period, so that the light is emitted. By increasing the discharge efficiency with respect to the emission direction of the emitted light, increasing the brightness, and emitting the emitted light from a small area, the emitted light from the electrodeless lamp can be used as a point light source.

According to the second aspect of the present invention, the same effect as that of the first aspect is obtained, and the energy of the microwave is efficiently guided into the electrodeless lamp by the loop gap resonator. By increasing the discharge efficiency with respect to the emission direction of the emitted light, increasing the brightness, and emitting the emitted light from a small area, the emitted light from the electrodeless lamp can be used as a point light source.

Further, according to the image display device using the microwave discharge light source device according to the present invention, the point light source based on the performance of the electrodeless lamp is used as the projection light source for image display. It can contribute to the low power consumption of the device, and can enlarge and project an image with high brightness / high image quality / high definition by the microwave discharge light source device.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a microwave discharge light source device according to a first embodiment of the present invention.

FIG. 2 is a view for explaining a rotational movement of electrons generated in an electrodeless lamp under the influence of a magnetic field in the microwave discharge light source device of the first embodiment shown in FIG.

FIG. 3 is a cross-sectional view showing a first modification in which the microwave discharge light source device of the first embodiment is partially modified.

FIG. 4 is a sectional view showing a second modification in which the microwave discharge light source device of the first embodiment is partially modified.

FIG. 5 is a cross-sectional view illustrating a microwave discharge light source device according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a first modification in which the microwave discharge light source device of the second embodiment is partially modified.

FIG. 7 is a cross-sectional view showing a second modification in which the microwave discharge light source device of the second embodiment is partially modified.

FIG. 8 is an enlarged perspective view of a loop gap resonator in the microwave discharge light source device shown in FIGS.

FIG. 9 is a configuration diagram showing a transmission type image display device using the microwave discharge light source device according to the present invention.

FIG. 10 is a configuration diagram showing a reflective type image display device using the microwave discharge light source device according to the present invention.

FIG. 11 is a configuration diagram showing a microwave discharge light source device as an example of a conventional example.

FIG. 12 is a diagram for explaining a rotational motion of electrons existing in a lamp vessel under the influence of a magnetic field in the microwave discharge light source device shown in FIG.

[Explanation of symbols]

10A: a microwave discharge light source device according to the first embodiment of the present invention; 10B: a microwave discharge light source device according to a first modification in which the first embodiment is partially modified; 10C: a partially modified first embodiment. Microwave discharge light source device of second modified example, 11: resonator 11, 11a: small diameter portion, 11a1: opening, 11b
... Large diameter portion, 12,13 ... Permanent magnet, 12a, 13a ... Line of magnetic force, 14 ... Electrodeless lamp, 14a ... First lamp portion, 1
4b 2nd lamp part, 15a rare gas, 15b discharge medium, 16 magnetron, 18 lid, 18a central hole,
20A: a microwave discharge light source device according to the second embodiment of the present invention; 20B: a microwave discharge light source device according to a first modification in which the second embodiment is partially modified; 20C: a partially modified second embodiment. Microwave discharge light source device of second modification, 21: loop gap resonator, 30: transmission type image display device using microwave discharge light source device according to the present invention, 40: microwave discharge light source device according to the present invention , A reflection type image display device using L, L ... outgoing light.

Claims (8)

[Claims] A magnetron for generating a microwave; a resonator having an opening for emitting the light while resonating the microwave; and a resonator provided in the resonator and discharged by the microwave. And a first lamp section enclosing a rare gas and a discharge medium and having a longitudinal direction elongated toward the opening side, and enclosing only a rare gas discharged by the microwave. An electrodeless lamp integrally formed with a second lamp portion covering an outer peripheral portion in the longitudinal direction of the electrodeless lamp; and a longitudinal direction of a first lamp portion of the electrodeless lamp and a direction parallel to an emission direction of light emitted from the electrodeless lamp. And a magnetic force generating means for generating a line of magnetic force. 2. A magnetron for generating a microwave, a resonator having an opening for emitting the light while resonating the microwave, and provided in the resonator and discharged by the microwave. And a first lamp section enclosing a rare gas and a discharge medium and having a longitudinal direction elongated toward the opening side, and enclosing only a rare gas discharged by the microwave. An electrodeless lamp integrally formed with a second lamp portion covering an outer peripheral portion in the longitudinal direction of the electrodeless lamp; and a longitudinal direction of a first lamp portion of the electrodeless lamp and a direction parallel to an emission direction of light emitted from the electrodeless lamp. And a loop gap resonator provided on the optical axis of the light emitted from the electrodeless lamp and having both electromagnetic inductive properties and electric capacitive properties. Microwave discharge light source device. 3. The loop gap resonator according to claim 1, wherein said loop gap resonator is formed in a substantially tubular shape, and an inner diameter of said loop gap resonator is smaller than a lamp diameter of a first lamp portion of said electrodeless lamp. 3. The microwave discharge light source device according to 2. 4. The microwave discharge according to claim 1, wherein said opening formed in said resonator is opened substantially perpendicularly to the direction of said line of magnetic force. Light source device. 5. The microwave discharge light source device according to claim 1, wherein said magnetic force generating means generates said lines of magnetic force by a permanent magnet. 6. The microwave discharge light source device according to claim 1, wherein said magnetic force generating means generates said lines of magnetic force by an electromagnetic coil. 7. An electrodeless lamp according to claim 1, wherein an opening area of said opening formed in said resonator is smaller than a lamp diameter of a first lamp portion of said electrodeless lamp. The microwave discharge light source device as described in the above. 8. An image display device using the microwave discharge light source device according to claim 1 as a projection light source for image display.