JP2002006396A - Light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device with can effectively use light shielded conventionally by a lamp shielding part, without weakening thermal and mechanical strength of the lamp shielding part. SOLUTION: In the light source device which has a lamp 1 having a light- emitting tube part 11 and lamp shielding parts 12 and 18, and a reflecting mirror 2 to reflect light emitted from the light-emitting tube part 11, the lamp shielding part 12 of a side emitting the light is reduced so that the light which is reflected by the reflecting mirror 2 to radiate on a prescribed incidence area 4 may radiate fully, without being shielded by the light-emitting tube part 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a light source device, and more particularly to a light source device for a projector.

[0002]

2. Description of the Related Art Generally, a projector is required to illuminate an image with uniform and sufficient color rendering on a screen, and a metal halide lamp in which mercury or a metal halide is sealed is used as a light source for this purpose. I have. Further, in recent years, metal halide lamps have been further reduced in size and point light sources, and lamps having an extremely short distance between electrodes have been put to practical use.

In recent years, the mercury vapor pressure has been increased.
This reduces the spread of the arc and further enhances
Light output and color rendering.
Extremely high operating pressure when lit, replacing Talhalide lamps
High, for example, about 1 × 10 ⁶ Mercury vapor pressure above Pa
Has been proposed.

[0004] Projectors, as non-self-emitting type spatial modulation element, liquid crystal or ^DMD TM (Digital M
Although a device using a micromirror device (registered trademark of Texas Instruments Co., Ltd.) is used, a light source device for a liquid crystal is configured by disposing a lamp in a parabolic reflector and forming a relatively large liquid crystal plate. It is often designed to allow approximately parallel light to enter. Meanwhile, DM
In the light source device for D, as shown in FIG. 4, the lamp is often arranged in the substantially elliptical reflecting mirror, and the light is focused near the second focal point of the reflecting mirror and emitted from the lamp. and a light receiving area is reflected by the reflective spatial modulator device, such as a very small DMD ^TM as compared to the liquid crystal, thereby displaying an image on a screen through a projection lens.

In recent years, miniaturization of projectors has been promoted, and accordingly, there has been an increasing demand for miniaturization and short focal length of the reflector itself in order to reduce the size of the entire light source device. With the miniaturization of the reflecting mirror, a non-self-luminous spatial modulation element located near the distance of the reflected light to the liquid crystal plate and near the second focal point of the reflecting mirror and an optical system for condensing light on the modulation element, for example, The distance between a lens for condensing the radiated light on the DMD and a condensing part on a fiber or the like has become extremely short.

FIG. 5 is a diagram showing a part of the configuration of a light source device used as a light source for a DMD.

In FIG. 1, reference numeral 1 denotes a high-pressure discharge lamp, 2 denotes a reflecting mirror formed in a substantially elliptical shape, and 3 denotes a base. The high-pressure discharge lamp 1 has an arc tube portion 11, a lamp sealing portion 12,
18, an external lead 13 for supplying electric power from the outside, a foil 14 provided between the external lead 13 and the electrode 15, and electrodes 15 and 16. Reference numeral 4 denotes a non-self-luminous spatial modulation element provided near the second focal point of the reflecting mirror 2 and a light condensing portion indicating a predetermined incident range for inputting light to an optical system for condensing light on the modulation element. The center.

Here, K1 is an area of the light radiated from the arc tube section 11 toward the condensing section 4 by the reflecting mirror 2 and an area which is shielded by the arc tube section 11 and an area which is not shielded. It is an imaginary line indicating the boundary with. K2 indicates a boundary between a region shielded by the lamp sealing portion 12 and a region not shielded by the light emitted from the arc tube portion 11 toward the light collecting portion 4 by the reflecting mirror 2. Line.

[0009]

However, in the light source device according to the prior art, as shown in FIG. 5, with the miniaturization of the reflecting mirror, the light source device up to the light condensing portion 4 located near the second focal point of the reflecting mirror 2 is increased. Is very short, and after the light enters the range indicated by the area A of the reflecting mirror 2 formed between the virtual line K1 and the virtual line K2, the reflected light reaches the second focal point of the reflecting mirror 2. If the distance is too long, the light cannot be used effectively because it is blocked by the lamp sealing portion 12 even though the light can be used effectively.

On the other hand, in order to maintain the strength of the lamp sealing portion 12, the high-pressure discharge lamp 1 has at least a sealing portion diameter of φ4.
mm or more, and the lamp sealing portion 12 needs a predetermined length in order to provide a welding portion between the external lead 13 and the foil 14 and a sealing portion with the foil 14 with a predetermined heat resistance. Also, it is desired that the length of the reflecting mirror 2 be at least 60 mm or less in the lamp axis direction connecting the opposing electrodes of the lamp 1.

Therefore, in such a situation, if the length of the lamp sealing portion 12 is simply shortened in order to make effective use of the reflected light blocked by the lamp sealing portion 12, the temperature of the welding portion and the foil will be reduced. It rises to cause such problems as leaks and ruptures due to oxidation of these portions. Further, when the entire diameter of the lamp sealing portion 12 itself is reduced, the boundary between the arc tube portion 11 and the lamp sealing portion 12 is weakened, the sealing strength is reduced, and lamp rupture or the like easily occurs during lighting. Become.

SUMMARY OF THE INVENTION In view of the above-mentioned various problems, an object of the present invention is to prevent a lamp sealing portion from being heated by receiving light reflected from a reflecting mirror and to have a decrease in mechanical strength. Instead, it is an object of the present invention to provide a light source device capable of effectively using reflected light that has been blocked by a lamp sealing portion.

[0013]

The present invention employs the following means in order to solve the above-mentioned problems.

According to a first aspect, in a light source device having a discharge lamp having an arc tube portion and a lamp sealing portion, and a reflecting mirror for reflecting light emitted from the arc tube portion, light is emitted. The end of the lamp sealing portion on the side is reduced so that the light reflected by the reflecting mirror and emitted to a predetermined incident range is almost radiated without being blocked by the lamp sealing portion. .

The second means emits light in a light source device having a discharge lamp having an arc tube portion and a lamp sealing portion, and a reflecting mirror for reflecting light emitted from the arc tube portion. The lamp sealing portion on the side is reduced so that the light reflected by the reflecting mirror and emitted to a predetermined incident range is located within a range blocked by the arc tube portion.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a partial sectional view showing the configuration of a light source device when the high-pressure discharge lamp according to the first embodiment of the present invention is used as a light source for a DMD.

In FIG. 1, reference numeral 121 denotes a lamp sealing portion 12.
Becomes thinner toward the end opposite to the arc tube part 11,
A tapered portion as a so-called tapered portion as a reduced diameter portion, 122 is a cylindrical portion of the lamp sealing portion 12 having the same sealing portion diameter as a conventional high pressure discharge lamp, and K3 is
Out of the light emitted from the arc tube part 11 toward the condenser part 4 by the reflecting mirror 2, the lamp sealing part 12
Are the imaginary lines indicating the boundary between the region shielded by the tapered portion 121 and the region not shielded, and K1 and K2 are imaginary lines imagined in the conventional high-pressure discharge lamp shown in FIG. Other configurations correspond to the configurations of the same reference numerals shown in FIG.

Here, the tapered portion 12 of the lamp sealing portion 12
The virtual line K3 indicating the boundary between the area shielded by the light emitting element 1 and the area not shielded matches the virtual line K1 indicating the boundary between the area shielded by the arc tube part 11 and the area not shielded. As a result, the light reflected by the area A of the reflecting mirror 2, which was blocked by the lamp sealing portion 12 and could not be used effectively in the conventional lamp, has been effectively used.

FIG. 2 is an enlarged perspective view of the lamp sealing portion 12. FIG.
FIG. 2B shows a case in which 21 is formed in a conical shape.
The case where the taper part 121 of the lamp sealing part 12 is formed in a pyramid shape is shown.

Although FIG. 2 shows an example of the shape of the tapered portion, polygonal pyramids and shapes obtained by combining them may also be used.

As described above, according to the first embodiment of the present invention, as shown by the imaginary line K3, the arc tube portion 1
The lamp sealing portion 12 has a tapered portion 121 so that the virtual line K1 and the virtual line K3, which represent the boundary where the reflected light starts to be shielded by the arc tube portion 11, of the light radiated from 1 to the reflecting mirror 2 coincide. Is formed, that is, the lamp sealing portion 12
Is reduced or reduced in diameter so that the light emitted to the condenser 4 by the reflecting mirror 2 is located within a range where the light is shielded by the arc tube 11, so that the light is conventionally cut by the lamp sealing portion 12. Reflected light from the area A of the reflecting mirror 2
The light can be made incident on the light condensing part 4, and the effective light can be increased.

In the first embodiment of the present invention, the case where the virtual line K1 and the virtual line K3 coincide has been described. However, the present invention is not limited to the case where the virtual line K3 always coincides with the virtual line K1. Absent. For example, ideally, the virtual line K
By forming the tapered portion 121 of the lamp sealing portion 12 so that 1 and the virtual line K3 coincide with each other, the region A of the reflecting mirror 2 is formed.
However, if the tapered portion 121 of the lamp sealing portion 12 is formed so that the imaginary line K1 and the imaginary line K3 coincide with each other, the lamp sealing portion 12 becomes thermally or In the case where the mechanical strength is weakened, that is, the end of the lamp sealing portion 12 is reflected from the reflecting mirror 2 and collected within a range in which the lamp sealing portion 12 maintains thermal or mechanical strength. By reducing or reducing the diameter of the light radiated to the light unit 4 so as to reduce the range blocked by the lamp sealing unit 12, the effective light can be increased as compared with the conventional one.

The reduced diameter portion defined by the imaginary line K3 may be provided in a region where the light reflected by the reflecting mirror 2 is blocked by the arc tube portion 11 if necessary. The effect more than the case where the virtual lines K3 match can not be obtained.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a light source device using a high-pressure discharge lamp according to the present invention will be described below.

Example Lamp Specifications Length (total length) of discharge vessel 54 mm Outer diameter of spherical portion of arc tube φ11.3 Inner diameter of spherical portion of arc tube φ4.9 Length of lamp sealing portion 22 mm (taper portion; 14 mm) , Cylindrical part; 8mm) Diameter of lamp sealing part φ6 Shape of lamp sealing part Cylinder Distance between poles 1.6 Rated power DC150W Reflecting mirror specification Reflecting mirror opening diameter φ46 Reflecting mirror length 52.5mm Reflecting surface shape Ellipse, F1 = 8, F2 = 64 Condensing part for DMD Distance between condensing part for φ8 DMD and reflecting mirror 64mm By using the light source device of the above specification, the light utilization rate is improved, and the DMD is used. The illuminance on the screen of the projector was improved by 2.6%.

FIG. 3 is a partial sectional view showing the structure of a light source device when a high-pressure discharge lamp according to a second embodiment of the present invention is used as a light source for a DMD.

In the figure, reference numeral 122 denotes a lamp sealing portion 12.
A cylindrical portion 123 having the same sealing portion diameter as the conventional high-pressure discharge lamp;
This is a small diameter portion as a reduced diameter portion formed with a smaller diameter.
Other configurations correspond to the configurations of the same reference numerals shown in FIG.

Also in the second embodiment of the present invention, as indicated by a virtual line K3, of the light emitted from the arc tube section 11 to the reflecting mirror 2, the reflected light is blocked by the arc tube section 11. The lamp sealing portion 12 is provided with a small-diameter portion 123 so that the virtual line K1 and the virtual line K3 representing the starting boundary coincide with each other, and is cut by the lamp sealing portion 12 as compared with a conventional high-pressure discharge lamp. It is possible to use the light reflected from the area A of the reflecting mirror 2 as effective light.

[0030]

According to the first aspect of the present invention, the end of the lamp sealing portion on which light is radiated is reduced so that the light blocked by the lamp sealing portion is reduced. Therefore, of the light reflected by the reflecting mirror and emitted to the predetermined incident range, the light shielded by the end of the lamp sealing portion can be reduced, and the light amount to the predetermined incident range can be increased. be able to.

According to the second aspect of the present invention, the lamp sealing portion on the side from which light is radiated is reduced so as to be positioned within a range shielded by the arc tube portion, so that the light is reflected by the reflecting mirror. Since the light shielded by the lamp sealing portion out of the light emitted to the predetermined incident range can be eliminated, the light amount to the predetermined incident range can be further increased.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view illustrating a configuration of a light source device when a high-pressure discharge lamp according to a first embodiment of the present invention is used as a light source for a DMD.

FIG. 2 is an enlarged perspective view of a lamp sealing portion 12 shown in FIG.

FIG. 3 is a partial cross-sectional view showing a configuration of a light source device when a high-pressure discharge lamp according to a second embodiment of the present invention is used as a light source for a DMD.

FIG. 4 is a diagram illustrating an example of a configuration of a projector using a DMD.

FIG. 5 is a partial cross-sectional view showing a configuration of a light source device when a high-pressure discharge lamp according to the related art is used as a light source for DMD.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 High-pressure discharge lamp 11 Arc tube part 12 and 18 Lamp sealing part 121 Tapered part 122 Cylindrical part 123 Small diameter part 13 External lead 14 Foil 15 and 16 Electrode 17 Center between electrodes 2 Reflecting mirror 3 Base 4 Condensing part K1 Arc tube Of the light emitted from the section 11 toward the condenser section 4 by the reflecting mirror 2,
A virtual line K2 indicating a boundary between a region shielded by 1 and a region not shielded by the lamp K2 out of the light emitted from the light emitting tube unit 11 toward the condenser unit 4 by the reflecting mirror 2. A virtual line K3 indicating the boundary between the region shielded by the region 12 and the region not shielded by the lamp K3 out of the light emitted from the arc tube portion 11 toward the light collecting portion 4 by the reflecting mirror 2. A virtual line indicating a boundary between a region shielded by the 12 tapered portions 121 and a region not shielded

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // F21Y 101: 00 F21M 1/00 A

Claims (2)

[Claims] 1. A light source device comprising: a discharge lamp having an arc tube portion and a lamp sealing portion; and a reflecting mirror for reflecting light emitted from the arc tube portion, wherein a lamp enclosing the light is emitted. A light source device, wherein an end of a stop portion is reduced so that light reflected by the reflecting mirror and emitted to a predetermined incident range is almost radiated without being blocked by the lamp sealing portion. 2. A light source device comprising: a discharge lamp having an arc tube portion and a lamp sealing portion; and a reflecting mirror for reflecting light emitted from the arc tube portion, wherein a lamp enclosing the light is emitted. A light source device, wherein a stop portion is reduced so that light reflected by the reflecting mirror and emitted to a predetermined incident range is located within a range blocked by the arc tube portion.