JP2004362864A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp capable of efficiently shielding undesired radiation at a low cost. <P>SOLUTION: This light source device 10 has a shielding layer 22 for shielding undesired radiation generated in an arc tube 28. When this high-pressure discharge lamp 16 of the light source device 10 incorporated in an optical apparatus is lit, discharge is generated in an electrode 40 in the arc tube 28, and the undesired radiation is generated with the discharge. Since the undesired radiation is, however, shielded by the shielding layer 22 formed on the device 10, the undesired radiation is never leaked to the outside of the light source device. Thereby, the need of mounting a shielding member to a housing part of an optical engine with the optical device 10 mounted can be reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light source device using a high-pressure discharge lamp applied to an optical device such as a projection television or the like, and relates to a light source device having a function of shielding an electromagnetic wave generated in an arc tube.
[0002]
[Prior art]
A high-pressure discharge lamp is generally used in a light source device of an optical device such as a projection television. In a high-pressure discharge lamp, an electromagnetic wave (hereinafter, referred to as “unnecessary radiation”) is generated between electrodes in an arc tube. Therefore, it is necessary to prevent unnecessary radiation from leaking to the outside of the optical device. That is, if unnecessary radiation leaks to the outside of the optical device, it causes adverse effects such as giving noise to a television image or a radio sound. Therefore, it is necessary to shield the unnecessary radiation in the optical device. For example, in the United States of America, the amount of unwanted radiation leakage must meet the standards set by the Federal Communications Commission (FCC).
[0003]
Therefore, conventionally, as shown in FIG. 6, a shielding member 4 for shielding unnecessary radiation has been attached to the housing 3 of the optical engine 2 on which the light source device 1 is mounted.
[0004]
[Problems to be solved by the invention]
Since the light source device 1 (FIG. 6) is incorporated in the optical engine 2, the housing 3 of the optical engine 2 is much larger than the light source device 1. On the other hand, since unnecessary radiation is generated in the arc tube of the high-pressure discharge lamp constituting the light source device 1, providing the shielding member 4 so as to surround the arc tube is a measure against unnecessary radiation.
[0005]
Therefore, in the related art in which the shielding member 4 is attached to the housing 3 of the optical engine 2, it is necessary to increase the area of the shielding member 4, and there is a problem that the cost is high. Also, since unnecessary radiation is shielded when it diffuses to some extent, there is a disadvantage that the shielding efficiency is poor.
[0006]
Therefore, a main object of the present invention is to provide a light source device capable of efficiently shielding unnecessary radiation at a low cost.
[0007]
[Means for Solving the Problems]
The invention described in claim 1 is “a light source device including a high-pressure discharge lamp having an arc tube, a reflector that reflects light generated in the arc tube, and a shielding unit that shields an electromagnetic wave generated in the arc tube”. is there.
[0008]
In the present invention, since the light source device has the shielding means, the necessity of separately attaching a shielding member to the housing of the optical engine can be reduced.
[0009]
The invention described in claim 2 is the light source device according to claim 1, “a light source device including a lamp house for accommodating a high-pressure discharge lamp and a reflector, and a shielding means provided in the lamp house”.
[0010]
The present invention relates to a mode in which the shielding means is provided in the lamp house in the invention described in claim 1.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a sectional view showing a light source device 10 to which the present invention is applied. As shown in FIG. 2, the light source device 10 (FIG. 1) is used by being mounted on an optical engine 14 constituting an optical apparatus 12, and includes a high-pressure discharge lamp 16, a reflector 18, a front cover 20, and an electromagnetic device. And a shielding layer 22 as a “shielding means”.
[0012]
The optical device 12 shown in FIG. 2 is a projection television in which an image projected from the optical engine 14 is reflected by the reflecting mirror 24 and projected from the back of the screen 26, but the light source device 10 is applied. Examples of the optical device 12 include a projector and the like in addition to the projection television.
[0013]
The high-pressure discharge lamp 16 constituting the light source device 10 (FIG. 1) includes a sealed container 32 having a spherical arc tube 28 and a cylindrical sealing portion 30 extending straight from both ends thereof. Inside each of the sealing portions 30 in the envelope container 32, an electrode rod 34 having one end protruding into the internal space of the arc tube 28, a lead rod 36 having one end protruding outside, and the other end of the electrode rod 34 are provided. And a molybdenum foil 38 for electrically connecting the other end of the lead bar 36 to one end of each of the electrode bars 34. A pair of tungsten electrodes (hereinafter, simply referred to as “electrodes”) 40 is provided at one end of each of the electrode bars 34. The anode 40a and the cathode 40b are connected. Then, inside the arc tube 28, a rare gas such as mercury or argon, and at least one halogen (metal halide or metal halide) of I (iodine), Br (bromine), Cl (chlorine), F (fluorine) and the like. Halogen gas, etc.).
[0014]
The high-pressure discharge lamp 16 shown in FIG. 1 is a double-ended type DC lighting type ultra-high pressure mercury discharge lamp. A high-pressure mercury discharge lamp or a metal halide lamp may be used.
[0015]
The reflector 18 reflects light generated in the arc tube 28 of the high-pressure discharge lamp 16 in a predetermined direction. The reflector 18 has a hemispherical main body 42 having a reflecting surface, and a holder attached to the center of the main body 42. 44. The shielding layer 22 is provided on the outer surfaces of the main body 42 and the holder 44 of the reflector 18.
[0016]
The shielding layer 22 is for shielding unnecessary radiation generated in the arc tube 28, and is formed, for example, by forming a nickel layer on a base made of a copper plate. However, the shielding layer 22 only needs to be formed of a conductive material (copper, iron, etc.) capable of shielding unnecessary radiation or a magnetic loss material such as ferrite, and the specific mode is not limited to this embodiment. Not something. For example, the shielding layer 22 may be formed by applying a conductive paint to the outer surface of the reflector 18.
[0017]
When the high-pressure discharge lamp 16 is attached to the holder 44 of the reflector 18, one end of the lead rod 36 on the anode 40 a penetrates the holder 44 and protrudes to the outside, and one end of the lead rod 36 on the cathode 40 b is connected to the conductive wire 46. The conductive wire 46 is connected to one end, and the other end of the conductive wire 46 penetrates the side wall of the reflector 18 and protrudes to the outside.
[0018]
The front cover 20 covers the opening of the reflector 18 to protect the reflection surface of the reflector 18 and the high-pressure discharge lamp 16, and is made of a heat-resistant transparent material such as glass. Then, the outer peripheral portion of the front cover 20 is bonded to the opening end of the reflector 18.
[0019]
When the light source device 10 is mounted on the optical engine 14 of the optical device 12, the light source device 10 is mounted inside a lamp house 48 incorporated in the optical engine 14. Then, when the optical device 12 is turned on to emit light from the arc tube 28 of the light source device 10, an image is projected from the optical engine 14, and the image is reflected by the reflecting mirror 24 and projected on the screen 26. At this time, in the arc tube 28, unnecessary radiation is generated due to the discharge at the electrode 40. Since the unnecessary radiation is shielded by the shielding layer 22 of the light source device 10, the amount of leakage to the outside is greatly reduced. Is done.
[0020]
According to this embodiment, since the light source device 10 includes the shielding layer 22, the necessity of separately attaching a shielding member to the housing of the optical engine 14 can be reduced. Therefore, the area of the shielding means can be reduced, and the cost required for providing the shielding means can be reduced. Further, since the unnecessary radiation is shielded near the source of the unnecessary radiation, the shielding efficiency can be improved.
[0021]
In the above-described embodiment, the shielding layer 22 as “shielding means” is provided on the outer surface of the reflector 18 of the light source device 10. For example, as shown in FIG. 3 or FIG. A shielding member 50 as “shielding means” may be provided on the inner surface or the outer surface. In these cases (FIGS. 3 and 4), the configuration including the high-pressure discharge lamp 16, the reflector 18, the front cover 20, the lamp house 48, and the shielding member 50 may be referred to as a “light source device 52”.
[0022]
Further, as shown in FIG. 5, the lamp house 48 may be formed of a conductive material and used as "shielding means". In this case (FIG. 5), the high-pressure discharge lamp 16, The configuration including the reflector 18, the front cover 20, and the lamp house 48 may be referred to as a "light source device 54".
[0023]
In the light source devices 52 (FIGS. 3, 4) and 54 (FIG. 5), the shielding layer 22 may or may not be provided on the outer surface of the reflector 18.
[0024]
【The invention's effect】
According to the first aspect of the present invention, since unnecessary radiation can be shielded by the shielding means of the light source device, the necessity of separately attaching a shielding member to the housing of the optical engine can be reduced. Therefore, the total area of the shielding means can be reduced, and the cost required for providing the shielding means can be reduced. In addition, since unnecessary radiation can be shielded before diffusing near the arc tube, the shielding efficiency can be increased.
[0025]
According to the second aspect of the invention, since the shielding means is provided in the lamp house, the necessity of separately attaching a shielding member to the housing of the optical engine can be reduced. Therefore, similarly to the first aspect, the cost can be reduced and the shielding efficiency can be increased.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a light source device.
FIG. 2 is a cross-sectional view illustrating an optical device in which a light source device is incorporated.
FIG. 3 is a cross-sectional view showing another light source device (provided with a shielding member on the inner surface of a lamp house).
FIG. 4 is a cross-sectional view showing another light source device (having a shielding member provided on an outer surface of a lamp house).
FIG. 5 is a sectional view showing another light source device (the lamp house itself is a shielding means).
FIG. 6 is a cross-sectional view showing a conventional technique.
[Explanation of symbols]
Reference Signs List 10 light source device 12 optical device 14 optical engine 16 high-pressure discharge lamp 18 reflector 20 front cover 22 shielding layer 24 reflecting mirror 26 screen 28 arc tube 48 lamp housing 50 shielding member

Claims (2)

A light source device comprising: a high-pressure discharge lamp having an arc tube; a reflector that reflects light generated in the arc tube; and a shielding unit that shields electromagnetic waves generated in the arc tube. The light source device according to claim 1, further comprising a lamp house that houses the high-pressure discharge lamp and the reflector, wherein the shielding unit is provided in the lamp house.

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