JPH0917382A - High pressure discharge lamp, lighting device, lighting system and liquid crystal projector - Google Patents

Abstract

PURPOSE: To reduce an ultraviolet ray radiant quantity to the outside, and reduce the number of lamp manufacturing processes by providing a cylindrical intermediate cylinder formed of a ultraviolet ray absorptive transmissive material between a discharge generating airtight vessel and an outer tube enclosing it. CONSTITUTION: In a metal halide lamp 1, preferably, a discharge medium is sealed in an airtight light emitting tube 3 enclosed in a concentric shape in a vacuum condition outer tube 2 made of hard glass, and a pair of electrodes are enclosed. An intermediate cylinder 10 surrounded in a concentric shape at prescribed intervals on the outer periphery of the light emitting tube 3 is enclosed in the outer tube 2. Preferably, the intermediate cylinder 10 is composed of a light transmissive material on which one or more kinds of Al, As, B, Ca, Cd, Cr, Cu, Fe, K, Li, Mg, Mn, Na, Ni, P, Sb, Ti, Zr and OH<-> are added to a glass base material and which absorbs ultraviolet rays of a wave length area of 253.7nm and on it periphery. Therefore, an ultraviolet ray quantity radiated from the intermediate cylinder 10 is reduced, and in an UV reflecting film to inside and outside surfaces of the intermediate cylinder 10, formation of an UV absorbing film becomes unnecessary.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure discharge lamp such as a metal halide lamp, and a lighting device, a lighting device and a liquid crystal projector using the high pressure discharge lamp as a light source.

[0002]

2. Description of the Related Art Generally, this type of metal halide lamp has the characteristics of high efficiency and high color rendering, and a small wattage small metal halide lamp is widely used for indoor lighting. Especially when using this kind of metal halide lamp as a spotlight, fading of the irradiated object due to ultraviolet rays (hereinafter referred to as UV) emitted from this lamp,
Harm to the human body becomes a problem.

Therefore, conventionally, Japanese Patent Laid-Open No. 52-2388 has been proposed.
No. 1, JP 59-105259, JP 6
As described in JP-A-2-66555, JP-A-2-148558, JP-A-2-148559 and the like, UV is applied to the inner surface or outer surface of the arc tube, the middle tube and the outer tube.
It is known that a reflective film or a UV absorbing film is formed.

[0004]

However, in such a conventional metal halide lamp, an arc tube, a middle tube,
A step of forming a UV reflection film or a UV absorption film on the inner or outer surface of the outer tube is required. Therefore, there are problems that the number of steps in manufacturing the lamp is large and the manufacturing cost is high.

Therefore, the present invention provides a high-pressure discharge lamp, a lighting device, a lighting device, and a liquid crystal projector which can reduce the amount of ultraviolet radiation to the outside and also has a small number of steps for manufacturing the lamp and is low in manufacturing cost. Especially.

[0006]

A high-pressure discharge lamp according to the first aspect of the present invention comprises an airtight container for enclosing a discharge medium; a discharge means for generating a discharge in the airtight container; and an outer tube containing the airtight container. A middle cylinder formed of a translucent material that absorbs ultraviolet rays into a cylindrical shape and surrounding the airtight container inside the outer tube;

Here, as the high pressure discharge lamp, there are a metal halide lamp, a high pressure sodium lamp, a mercury lamp and the like. As the discharge medium, argon (Ar), xenon (Xe), neon (Ne), krypton (Kr) gas,
Alternatively, it may be an inert gas of a mixed gas of two or more kinds of these rare gases, and together with this, an appropriate amount of mercury may be enclosed in the bulb.

A high pressure discharge lamp according to a second aspect of the present invention is the invention according to the first aspect, wherein the middle tube is made of a glass substrate.
Al, As, B, Ca, Cd, Cr, Cu, Fe, K,
Li, Mg, Mn, Na, Ni, P, Sb, Ti, Z
At least one of r and OH ⁻ is added, and 253.7
It is composed of a translucent material that absorbs ultraviolet rays in the wavelength range of nm and its surroundings.

The wavelength range around 253.7 nm is, for example, 250 to 260 nm. In this wavelength range, necessary ultraviolet rays are not output to the outside of the outer tube.

The high pressure discharge lamp of the invention of claim 3 is the invention of claim 1 or 2, wherein the outer tube is made of hard glass.

A high-pressure discharge lamp according to a fourth aspect of the present invention is the high-voltage discharge lamp according to the first to third aspects, further comprising a heat retaining member formed around the discharge means of the airtight container.

The high-pressure discharge lamp according to a fifth aspect of the present invention is the high-voltage discharge lamp according to the fourth aspect of the present invention, further comprising a pair of heat retaining members disposed at both ends of the axial opening of the middle cylinder.

A high-pressure discharge lamp according to a sixth aspect of the present invention is the invention according to any one of the first to fifth aspects, further including a discharge medium containing a metal halide enclosed in an airtight container.

A lighting device according to a seventh aspect of the present invention comprises the high pressure discharge lamp according to the sixth aspect of the present invention; and a lighting circuit for supplying electric power to the high pressure discharge lamp to stably turn on the lamp.

An illumination device according to an eighth aspect of the present invention includes the lighting device according to the seventh aspect of the present invention; and a lighting device main body that houses the lighting device.

A liquid crystal projector according to a ninth aspect of the invention is
A high-pressure discharge lamp according to any one of claims 1 to 6, a lighting means for supplying electric power to the high-pressure discharge lamp to form a stable discharge, and a reflector for reflecting light from the high-pressure discharge lamp. A liquid crystal panel for transmitting light from a reflector; a signal control means for forming an image on the liquid crystal panel; a high pressure discharge lamp, a lighting means, a reflector, a liquid crystal panel and a signal control means, and from the liquid crystal panel And a case having an opening for projecting the transmitted light.

[0017]

According to each of the first to sixth aspects of the invention, since the ultraviolet ray emitted from the airtight container, for example, the wavelength of 253.7 nm and its surrounding ultraviolet rays are absorbed by the middle cylinder, the ultraviolet rays emitted from the outer tube to the outside are reduced. be able to. Therefore, it is possible to reduce the discoloration of the irradiated object and the adverse effect on the human body due to the irradiation of ultraviolet rays.

According to the invention of claim 2, a predetermined additive such as Ti is added to the glass base material to form the middle cylinder, and
Since it has an ultraviolet absorption function in the wavelength range of 3.7 nm and its surroundings, it reduces the amount of ultraviolet radiation without forming a UV reflection film or a UV absorption film on the inner or outer surface of this middle cylinder. be able to. Therefore, the number of lamp manufacturing steps can be reduced to improve the manufacturing workability and reduce the manufacturing cost.

According to the third aspect of the present invention, since the outer tube containing the inner tube is made of hard glass having high mechanical strength, even if the inner tube is broken due to the rupture of the arc tube, the fragments and the like are removed from the outer tube. Can be received by Therefore, it is possible to prevent the debris and the like from scattering to the outside of the outer tube.

According to a fourth aspect of the present invention, a heat insulating member is formed on each of the inner surface and the outer surface of the airtight container around the electrodes of the discharge means, and the outer periphery of the airtight container is surrounded by the middle cylinder. The heat retained in the container can be double-heated by the heat-retaining member and the middle cylinder. Therefore, it is possible to prevent the airtight container from cooling and lowering the luminous efficiency.

According to the invention of claim 5, since the heat insulating member of the airtight container is arranged at both ends of the opening of the middle cylinder, the heat held in the airtight container is diffused from both ends of the opening of the middle cylinder by natural convection in the outer tube. It is possible to prevent the heat insulating member from trying to reduce the heat insulating effect.

The invention of claim 6 is a metal halide lamp in which a metal halide is enclosed as a light emitting substance, and therefore has the features of high efficiency and high color rendering.

The lighting device according to the seventh aspect of the invention, the lighting device according to the eighth aspect of the invention, and the liquid crystal projector of the ninth aspect of the invention are respectively provided with the high-pressure discharge lamps of the first to sixth aspects. Has an effect.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4, the same or corresponding parts are designated by the same reference numerals.

FIG. 1 is a front view showing a metal halide lamp as an embodiment of the present invention. In this figure, a metal halide lamp 1 is provided in an outer tube 2 of a so-called T40 bulb, which is made of hard glass and has a substantially covered cylindrical shape. For example, a so-called double-sealed arc tube 3 is concentrically built in, and a screw-type base 4 is sealed at the open end of the outer tube 2 to keep the outer tube 2 in a vacuum state.

The arc tube 3 has a pair of sealing ends 3b and 3c integrally connected to both axial ends of the elliptic spherical portion 3a. In the elliptic spherical portion 3a, a rare gas such as Ar is used. And a pair of electrodes (not shown) serving as discharging means are concentrically arranged facing each other at a predetermined interval and incorporated.
The pair of sealing ends 3b and 3c hermetically seal the inner ends of the pair of upper and lower power supply members 5a and 5b electrically connected to the pair of electrodes in FIG. On the other hand, these feeders 5a and 5b
The outer end portion of the outer side of each sealing end portion 3b, 3c (inside the outer tube 2)
Airtightly extends to.

The outer end of the power feeder 5a is electrically and mechanically connected to the upper end of the support wire 6 in the shape of a rectangular frame in FIG. The lower end of the support wire 6 in the figure penetrates the stem 7 in an airtight manner, is electrically connected to the inner wall surface of the base 4, and is supplied with power.

The outer end of the lower power supply member 5b penetrates the stem 7 in an airtight manner and is electrically connected to the eyelet on the inner bottom surface of the base 4 for power supply. A Ba getter 8 for storing impure gas is connected around the stem 7 in the outer tube 2.

The arc tube 3 has a pair of upper and lower heat insulating plates 9a and 9b in the shape of an annular band formed around the pair of electrodes on the inner or outer surface of the elliptic spherical portion 3a. These heat insulating plates 9a and 9b are made of, for example, molybdenum (Mo) plates, and mainly reflect infrared rays to each electrode side to keep the arc tube 3 warm so as to suppress a decrease in luminous efficiency due to a decrease in temperature of the arc tube 3. It has become.

A cylindrical inner tube 10 made of UV-cut glass is concentrically contained in the outer tube 2 so as to concentrically surround the outer circumference of the arc tube 3 at a predetermined interval. This middle cylinder 1
The UV cut glass of No. 0 is obtained by adding at least one of the following additives to a glass substrate in an appropriate amount shown below. For example, Al is 14 ppm (all units are the same below), As is 0.01 or less, B is 0.2 or less, Ca is 0.4, Cd is 0.01 or less, Cr is 0.05, and Cu is 0.05. Less than,
Fe 0.2, K 0.6, Li 0.6, Mg 0.
1, Mn 0.05 or less, Na 0.7, Ni 0.1
Hereinafter, P is 0.2 or less, Sb is 0.003 or less, Ti is 500, Zr is 0.8, and OH ⁻ is 5 or less. The middle cylinder 10 is formed of this UV cut glass into a cylindrical body having both axial ends opened, and has a light transmittance shown by a curve A in FIG.

That is, the middle cylinder 10 itself is, for example, 253.7.
nm and its surrounding wavelength range (for example, 250 to 260 nm)
Since it absorbs the ultraviolet rays, the amount of ultraviolet rays emitted from the middle cylinder 10 can be reduced.

The middle cylinder 10 has a peripheral groove 10 formed in the lower portion of FIG. 1, and is supported by fixing a stopper 11 fitted in the peripheral groove 10 to a part of the support wire 6. .

Further, by supporting both ends of the pair of holders 12a, 12b holding the upper and lower sealing ends of the middle cylinder 10 in FIG. 1 by the support wires 6, the middle cylinder 10 is supported in the outer tube 2. doing. Further, a wire net 13 is wound around the outer peripheral surface of the middle cylinder 10 to prevent the middle cylinder 10 from cracking.

The target specifications of the metal halide lamp 1 thus constructed are shown in Table 1 below.

[0035]

[Table 1]

Therefore, according to this embodiment, the arc tube 3
Since, for example, the ultraviolet ray having a wavelength of 253.7 nm and its periphery is absorbed by the middle cylinder 10, it is possible to reduce the ultraviolet ray of 253.7 nm and its periphery emitted from the outer tube 2 to the outside. Therefore, it is possible to reduce the discoloration of the irradiated object and the adverse effect on the human body due to the irradiation of ultraviolet rays.

Further, the middle cylinder 10 is formed by adding a predetermined additive such as Ti to the glass base material, and 253.7 is formed on the middle cylinder 10 itself.
Since it has a function of absorbing ultraviolet rays in the wavelength range of nm and its periphery, it is necessary to reduce the amount of ultraviolet rays radiated without forming a UV reflection film or a UV absorption film on the inner surface or outer surface of the middle cylinder 10. You can Therefore, the number of lamp manufacturing steps can be reduced to improve the manufacturing workability and reduce the manufacturing cost.

Further, since the outer tube 2 containing the inner cylinder 10 is made of hard glass having high mechanical strength and the wire net 13 is wound around the outer peripheral surface of the inner cylinder 10, the middle cylinder 10 should be for some reason. Even if is broken, the broken pieces and the like can be received by the outer tube 2. Therefore, it is possible to prevent the debris and the like from scattering to the outside of the outer tube.

Since the heat insulating plates 9a and 9b are formed on the inner surface or the outer surface of the arc tube 3 around the pair of electrodes, respectively, and the outer circumference of the arc tube 3 is surrounded by the middle cylinder 10, this light emission is achieved. The heat retained by the tube 3 is transferred to these heat insulation plates 9a, 9
It is possible to keep the temperature double by b and the middle cylinder 10. Therefore, it is possible to prevent the luminous tube 3 from cooling and the luminous efficiency from decreasing.

Moreover, since the heat insulating plates 9a and 9b are arranged on both ends of the opening of the middle tube 10, the heat held by the arc tube 3 is diffused from both ends of the opening of the middle tube 10 by natural convection in the outer tube 2. This can be suppressed by the heat insulating plates 9a and 9b, and the heat insulating effect can be suppressed from being reduced.

In the above embodiment, the ultraviolet rays absorbed by the middle cylinder 10 are ultraviolet rays in the wavelength range of 253.7 nm and its surroundings, but the present invention is not limited to this. For example, the wavelength is 214 nm and its surroundings, or It may be configured to absorb ultraviolet rays in the wavelength range of 219 nm and its surroundings.

A glass material that absorbs ultraviolet rays in such a wavelength range can be obtained by adding the additives shown in Table 2 below to a glass substrate. The unit of the added amount is ppm.

[0043]

[Table 2]

FIG. 3 shows an embodiment of a lighting device 21 in which the metal halide lamp 1 thus constructed is assembled as a light source. The lighting device main body 22 has a reflection surface 22a on the inner surface and a lower surface 22b. Alternatively, it has a housing structure in which one side surface is opened. A socket 23 is attached to the side wall of the luminaire main body 22, and the base 4 of the metal halide lamp 1 is screwed into the socket 23 and attached to the luminaire main body 22.

The socket 23 is adapted to be connected to a commercial power supply 25 via a lighting circuit 24 attached to the lighting fixture main body 22 or including a ballast installed outside the fixture main body 22. The power supply voltage is 200V and the lamp voltage is 100V ± 20V.

Also in this embodiment, the ultraviolet light UV radiated from the arc tube 3 of the metal halide lamp 1 is supplied to the middle cylinder 10.
Is absorbed by the lower surface opening 22 of the lighting device main body 22.
It is possible to reduce the ultraviolet rays UV emitted from b to the outside. Therefore, it is possible to reduce the discoloration of the irradiated object and the adverse effect on the human body due to the ultraviolet rays.

FIG. 4 shows an embodiment of a liquid crystal projector device 31 which uses the metal halide lamp 1 as a light source. This liquid crystal projector device 31 includes a metal halide lamp 1, a lighting circuit 32 for stably lighting the metal halide lamp 1 at high frequency, a reflector 33 for reflecting light emitted from the lamp 1, and a light projecting from the reflector 33. Optical system 3 for controlling the generated light
4 are provided. The optical system 34 includes a mirror 3 that bends and projects the light projected from the reflector 33 by, for example, about 90 °.
5, a condenser lens 36, a projection lens 37 and the like. A screen 38 is provided in front of the optical system 34, and a liquid crystal panel 39 is installed between, for example, a condenser lens 36 and a projection lens 37 so that the respective color lights are incident on the liquid crystal panel 39 without crossing each other. Has become. LCD panel 39
Is provided with a signal control circuit 40 which is a signal control means for forming an image thereon. The signal control circuit 40, the optical system 34, the reflector 33, the lighting circuit 32, and the metal halide lamp 1 are housed in the main body case 41, and light is projected onto the screen 38 from the light projecting opening 41a of the main body case 41. .

Therefore, the light emitted from the lamp 1 is reflected by the reflecting surface of the reflector 33, bent at a substantially right angle by the mirror 35 of the optical system 34, and condensed by the condenser lens 3.
It is condensed by 6. The respective color lights of the condensed light are incident on and transmitted through the liquid crystal panel 39 from the rear surface thereof without crossing, and the transmitted light is projected onto the screen 38 via the projection lens 37 of the optical system 34.

Further, since the liquid crystal projector device 31 can reduce the ultraviolet rays as described above, it is possible to reduce the discoloration of the screen due to the irradiation of the ultraviolet rays.

[0050]

As described above, according to each of the first to sixth aspects of the invention, for example, the wavelength of light emitted from the airtight container is 253.
Since it absorbs 7 nm and ultraviolet rays around it by the middle cylinder,
Ultraviolet rays emitted from the outer tube to the outside can be reduced. Therefore, it is possible to reduce the discoloration of the irradiated object and the adverse effect on the human body due to the irradiation of ultraviolet rays.

According to a second aspect of the present invention, a predetermined additive such as Ti is added to the glass base material to form the middle cylinder, and
Since it has an ultraviolet absorption function in the wavelength range of 3.7 nm and its surroundings, it reduces the amount of ultraviolet radiation without forming a UV reflection film or a UV absorption film on the inner or outer surface of this middle cylinder. be able to. Therefore, the number of lamp manufacturing steps can be reduced to improve the manufacturing workability and reduce the manufacturing cost.

According to the third aspect of the present invention, since the outer tube containing the inner tube is made of hard glass having high mechanical strength, even if the inner tube breaks for some reason, the outer tube receives fragments and the like. You can Therefore, it is possible to prevent the debris and the like from scattering to the outside of the outer tube.

According to the fourth aspect of the present invention, the heat insulating member is formed on the inner surface or the outer surface of the airtight container around the electrodes of the discharge means, and the outer periphery of the airtight container is surrounded by the middle cylinder. The heat retained in the container can be double-heated by the heat insulating film and the middle cylinder. Therefore,
It is possible to prevent the airtight container from cooling and lowering the luminous efficiency.

According to the fifth aspect of the present invention, since the heat insulating member of the airtight container is arranged at both ends of the opening of the middle cylinder, the heat retained in the airtight container is diffused from both ends of the opening of the middle cylinder by natural convection in the outer tube. It is possible to prevent the heat insulating member from trying to reduce the heat insulating effect.

Since the invention of claim 6 is configured as a metal halide lamp in which a metal halide is enclosed as a light emitting substance, it has a feature of high efficiency and high color rendering.

Since the lighting device of the invention of claim 7 and the illumination device of the invention of claim 8 and the liquid crystal projector of the invention of claim 9 are respectively equipped with the high pressure discharge lamps of claims 1 to 6, they are similar to these. It produces a working effect.

[Brief description of the drawings]

FIG. 1 is a front view showing a metal halide lamp as one embodiment of the present invention.

FIG. 2 is a graph showing ultraviolet ray reduction characteristics of the metal halide lamp shown in FIG.

FIG. 3 is a configuration diagram of an embodiment of a lighting device in which the metal halide lamp shown in FIG. 1 is assembled as a light source.

FIG. 4 is an overall configuration diagram of an embodiment of a liquid crystal projector according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal halide lamp (high pressure discharge lamp) 2 Outer tube 3 Arc tube 3a Elliptic spherical part of arc tube 3b, 3c Sealing end of arc tube 4 Bases 5a, 5b A pair of power feeders 6 Support wires 9a, 9b Heat insulating plate 10 Medium Tube 13 Wire mesh 21 Lighting device 22 Lighting fixture body 23 Socket 24 Lighting circuit 31 Liquid crystal projector device 34 Optical system 35 Mirror 36 Condenser lens 38 Screen 39 Liquid crystal panel

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location H04N 5/74 H04N 5/74 A (72) Inventor Daisuke Takayama 4-3, Higashishinagawa, Shinagawa-ku, Tokyo No. 1 within Toshiba Lighting & Technology Corporation

Claims (9)

[Claims] 1. An airtight container for enclosing a discharge medium; a discharge means for generating an electric discharge in the airtight container; an outer tube containing the airtight container; a tubular member made of a translucent material that absorbs ultraviolet rays. A high-pressure discharge lamp comprising: a middle cylinder that surrounds an airtight container in an outer tube. 2. The high pressure discharge lamp according to claim 1, wherein the middle tube is made of a glass substrate and made of Al, As, B, Ca, C.
d, Cr, Cu, Fe, K, Li, Mg, Mn, Na,
At least one of Ni, P, Sb, Ti, Zr, and OH ⁻ is added, and it is composed of a light-transmitting material that absorbs ultraviolet rays in the wavelength range of 253.7 nm and its surroundings. Discharge lamp. 3. The high pressure discharge lamp according to claim 1, wherein the outer tube is made of hard glass. 4. The high pressure discharge lamp according to claim 1, wherein a heat insulating member is formed around the discharge means of the airtight container. 5. The high pressure discharge lamp according to claim 4, wherein a pair of heat insulating members are provided at both ends of the axial opening of the middle cylinder. 6. The high pressure discharge lamp according to claim 1, wherein a discharge medium containing a metal halide is enclosed in an airtight container. 7. A lighting device comprising: the high-pressure discharge lamp according to claim 6; and a lighting circuit for supplying electric power to the high-pressure discharge lamp to stably light the lamp. 8. A lighting device, comprising: the lighting device according to claim 7; and a lighting device main body that houses the lighting device. 9. The high-pressure discharge lamp according to claim 1, a lighting means for supplying electric power to the high-pressure discharge lamp to stably form a discharge, and reflects light from the high-pressure discharge lamp. And a liquid crystal panel for transmitting light from the reflector; a signal control means for forming an image on the liquid crystal panel; a high pressure discharge lamp, a lighting means, a reflector, a liquid crystal panel and a signal control means, and A liquid crystal projector comprising: a housing having an opening for projecting transmitted light from a liquid crystal panel.