JP2004111136A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device capable of dissolving a bulb internal stress resulted from the thermal expansion of a bulb to prevent the breakage of a lamp or the like and facilitating the replacement of the lamp. <P>SOLUTION: This light source device, in which a short-arc type discharge lamp 1 and a concave reflector arranged to surround the lamp in a state where the arc direction and optical axis are mutually matched are housed in a casing, and one sealing end part of the lamp is immovably fixed to the casing. A substantially strip-like feeding plate 3 extended in the surface direction parallel to the optical axis is fixed to the other sealing end part of the lamp, and a feeding plate support member 4 is fixed to the casing. One of the feeding plate and the feeding plate support member has an engagement hole 32, and the other has an engagement projection 41, is characterized in that the feeding plate is supported by the feeding plate support member to be minutely movable by the engagement relation between the engagement hole and the engagement projection. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light source device, and more particularly, to a light source device including a high-intensity short arc lamp and a reflection mirror, which is used as a light source for digital light processing using a digital micromirror device, for example.
[0002]
[Prior art]
A new video technology called digital write processing (hereinafter abbreviated as DLP) using an optical semiconductor as a core called a digital micromirror device has recently become widely known as a full digital display technology. As a light source used in such an image technology, a high-brightness light source is considered to be suitable.In recent years, a high-pressure xenon short arc lamp has been used as a light source lamp and housed in a casing together with a concave reflecting mirror. Used as a combined light source device.
[0003]
FIG. 5 is a side sectional view showing an example of the optical device according to the above application. As shown in the figure, a reflection mirror 81 is fixed to a predetermined position of the casing 80 inside a substantially box-shaped casing 80, and one sealing end of a lamp 82 is inserted into a neck through hole 811 of the reflection mirror 81. The portion 821 is inserted. In front of the reflection mirror 81, a light-transmitting window portion 80a integrally fixed to one side surface C1 of the casing 80 is provided, and a light exit port M is formed. The lamp 82 has a holding mechanism 83 in which the end of the one sealing end 821 is fixed to the bottom surface 801 of the casing 80 so that the optical axis L1 of the reflection mirror 81 and the tube axis L2 of the lamp 81 coincide with each other. And is fixed to the casing 80. Thus, the reflection mirror 81 and the lamp 82 are positioned via the casing 80 and the holding mechanism 83. At the end of the one sealing end 821 of the lamp 81, a power supply member (not shown) is mounted.
[0004]
FIG. 6 is a diagram illustrating a holding and power supply structure on the lamp front side in the optical device.
A base 84 is attached to the other sealing end 822 of the lamp 82, that is, a front sealing end, and a power supply member 85 is connected to the base 84. The power supply member 85 includes a power supply plate 851 made of, for example, copper and a connection conductive plate 853 in which a power supply lead wire 852 is connected to a part thereof. At one end 851a of the power supply plate 851 is formed a through hole into which a screw portion 841 formed at the front end of the base 84 is loosely fitted. The through hole is fastened by a nut 86 and fixed to the base 84. 82 and is integrally fixed.
The power supply plate 851 extends downward from a portion where the power supply plate 851 is fastened to the lamp base 84 on a plane parallel to the optical axis L1, so that the radiated light from the lamp 82 is efficiently emitted forward. Become so. The power supply plate 851 is firmly fastened to the connection conductive plate 853 with screws 86, and the above-described power supply lead wire 852 is connected to the conductive plate 853 at a position where light from the lamp 82 is not blocked. In addition, below the conductive plate 853 for connection, an insulating block 87 is fixedly disposed on the bottom surface C2 of the casing 80, thereby insulating the casing 80 and the lamp 82 from each other. The power supply plate 851 is positioned with respect to the casing 80 via the connection conductive plate 853.
[0005]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2001-319502
[Problems to be solved by the invention]
However, the above light source device has the following problems.
(1) The lamp bulb becomes hot due to radiant heat from the arc during the lighting operation of the lamp, and the quartz glass constituting the bulb expands and contracts due to thermal expansion. If it is fixed, stress is applied to the bulb in a reactive manner.If such a phenomenon is repeated with lighting or non-lighting of the lamp, fatigue is accumulated in the bulb and quartz glass is accumulated. Will decrease in strength. In the above optical device, since both ends of the lamp are fixed in a stationary state by the holding member and the support member, the pressure resistance is reduced due to the stress accumulated in the bulb for the above-described reason. Then, the possibility that the valve is cracked increases.
(2) Since the support member is firmly fastened with screws or nuts or the like so that the optical axis does not shift after positioning, the danger at the time of lamp rupture can be reduced. When the lamp is replaced due to its service life or breakage, it is necessary to open all of the above-mentioned fastening points, so that the work of removing the power supply plate becomes very complicated, which takes a lot of time.
[0007]
In view of the above circumstances, if a terminal is attached to the end of the power supply line and directly fixed to the base without using the power supply plate, workability at the time of lamp replacement is good, and no stress is applied to the lamp bulb. However, when the power supply line is directly fastened to the base in front of the optical axis, the power supply line is relatively thick, which results in a shadow, thereby reducing the light use efficiency.
In addition, in such a case, if the lamp ruptures, there is a possibility that fragments of the lamp may fly forward together with the power supply line, which is very dangerous.
The problem to be solved by the present invention is to provide a light source device that can eliminate the stress in the bulb caused by the thermal expansion of the bulb, can prevent the lamp from being damaged, and can easily replace the lamp. is there. It is another object of the present invention to provide a light source device in which even if the lamp ruptures, fragments of the lamp do not scatter from the casing.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a short arc type discharge lamp and a concave reflecting mirror disposed so as to surround the lamp in a state where the arc direction of the lamp and the optical axis coincide with each other. In the light source device, one of the sealing ends of the lamp is fixed to the casing so as to be immovable with respect to the casing, the other sealing end of the lamp is provided with an engagement hole. A substantially band-shaped power supply plate extending in a plane direction parallel to the optical axis is fixed, a power supply plate support member provided with an engagement protrusion is fixed to the casing, and the power supply plate is It is characterized in that the power supply plate is supported by the power supply plate support member in a state in which it can be minutely moved by an engagement relationship between an engagement hole and the engagement protrusion.
Further, a movement restricting means for preventing the power supply plate from moving more than a predetermined amount is provided.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a light source device according to the present invention will be described in detail with reference to the drawings.
In the description of the drawings, the same elements will be denoted by the same reference symbols, without redundant description. Also, the dimensional ratios in the drawings do not always match those described.
FIG. 1 is a perspective view illustrating a power supply unit structure at a front end portion of a lamp for explaining a main part of the present invention, FIG. 2 is an explanatory diagram of a power supply unit structure viewed from a side of the lamp, and FIG. FIG. 4 is a diagram for explaining the lamp movement restricting means, and FIG. 4 is an explanatory diagram for explaining a method of attaching and detaching the lamp and the power supply plate.
This light source device is of a side emission type in which an emission port for emitting light is provided on one side surface (emission surface) of a casing, and the overall configuration is the same as that of the prior art. Omitted.
1 to 4, a lamp 1 is, for example, a xenon short arc lamp having a rated power consumption of 2 kW, and a sealing portion 11 behind the lamp 1 such that a tube axis L2 of the lamp 1 is substantially horizontal. Is held by a holding mechanism (not shown) and fixed to a casing (not shown) so as to be immovable. Note that the tube axis L2 of the lamp 1 matches the optical axis (L1) of the reflection mirror arranged in the light source device.
[0010]
A base 2 having a screw portion 21 at the tip is attached to a front sealing portion 12 on the light emitting side of the lamp 1.
[0011]
The power supply plate 3 is fastened to the base 2 with a nut 14 at the upper end, so that the power supply plate 3 is integrally fixed to the lamp 1. The power supply plate 3 is made of a 0.8 mm-thick copper band-like plate extending in a plane direction parallel to the optical axis, and is formed to extend downward from the fastening portion 31. The fastening portion 31 is formed on a plane perpendicular to the tube axis at the upper end of the power supply plate 3. However, since the fastening portion 31 is smaller than the maximum diameter portion of the base of the lamp 1, the fastening portion 31 is located in front of the lamp 1. Does not cause any problem with the emission of light.
[0012]
As shown in FIG. 2, an oval engagement hole 32 extending in a direction parallel to the tube axis L2 is formed at an end (lower end) of the power supply plate 3 opposite to the fastening portion 31.
[0013]
Here, the power supply plate support member 4 is fixed to the bottom surface C2 of the casing via an insulating block B so as not to move. The power supply plate support member 4 is provided with an engagement protrusion 41 that protrudes in a direction substantially perpendicular to the surface direction of the power supply plate 3 and engages with the engagement hole 32. Since the engagement hole 32 is formed in an oval shape extending in the direction parallel to the lamp axis L2 of the lamp rather than the engagement protrusion 41, the power supply plate 3 is provided with the power supply plate support member 4, that is, the casing bottom surface C2. Can move relatively in the direction of the tube axis L2 (arrow A).
The shape of the engagement hole 32 of the power supply plate 3 may be larger than the engagement protrusion 41 so as to form a gap of about 1 to 12 mm in the front and rear directions of the lamp in the tube axis direction.
[0014]
FIG. 3 is a sectional view taken along the line AA ′ in FIG. As shown in FIGS. 2 and 3, the power supply plate support member 4 has a horizontal surface 4a parallel to the casing bottom surface C2 and a vertical surface 4b perpendicular to the casing bottom surface C2, and a tongue piece member 5 is provided on the horizontal surface 4a. Is established.
The rear side edge of the tongue piece member 5 is fixed with a screw with a small gap S formed between the power supply plate 3 and the front side edge. By forming the minute gap S in this way, even when the valve expands due to heat, it is possible to prevent stress from being applied to the valve. And, even if the lamp 1 ruptures in a state where the lamp is attached, the tongue piece member 5 restricts the movement of the power supply plate 3, so that the base 2 of the lamp 1 may fly out. Is prevented. Therefore, even if the lamp ruptures, fragments of the lamp do not damage the window member attached to the front surface of the casing.
[0015]
When the screw 51 is loosened, the tongue member 5 is rotatable on the horizontal surface 4 a around the screw 51, so that when replacing the lamp 1, the tongue member 5 is connected to the power supply plate 3. If it is shifted from the front, the power supply plate 3 can be easily removed from the base 2, and therefore, the lamp 1 can be easily replaced.
[0016]
FIG. 4 is a diagram for explaining how to remove the power supply plate 3 when replacing the lamp. When the nut 14 screwed to the screw portion of the lamp is removed and the screw on the other end of the tongue piece member 5 is loosened, the power supply plate 3 becomes rotatable around the engaging portion 32 as a fulcrum. Since the front of the lamp 1 is completely open, the lamp can be easily replaced. When the lamp is removed, the lamp can be replaced without breaking the engagement relationship between the engagement protrusion 41 of the power supply plate support member 4 and the engagement hole 32 of the power supply plate 3, so that the nut is removed and the screw is loosened. Work can be done immediately.
[0017]
Further, during the lighting operation of the lamp, even if the lamp bulb expands and contracts due to thermal expansion, the power supply plate can move along the lamp axis along with the lamp. Is repeated, no tensile or compressive force due to expansion and contraction of thermal expansion is applied to the quartz glass of the lamp bulb, so that cracking of the lamp and the like can be prevented. Furthermore, even if the lamp ruptures, the movement of the power supply plate is restricted by the tongue member, so that the power supply plate does not jump forward from the light emission port of the device, and thus the window provided in the light emission port. There is no damage to members.
[0018]
It is needless to say that the present invention is not limited to the above embodiment, but can be appropriately changed. For example, in the engagement relationship between the power supply plate and the power supply plate support member, it suffices to provide an engagement hole in one of the two members and an engagement protrusion on the other member. It is also possible to provide an engagement hole in the power supply plate support member by providing a projection.
[0019]
【The invention's effect】
According to the light source device of the present invention described above, even if the bulb expands and contracts due to the repetition of turning on / off the lamp, the power supply plate can be slightly moved in a direction parallel to the optical axis. , The stress applied to the bulb is eliminated and the lamp can be prevented from being damaged. Further, since the power supply plate and the power supply plate support member have an engagement relationship, the lamp replacement operation can be performed very easily. Will be able to do it. In addition, there is no problem that the light emitted from the lamp is shielded by the power supply plate.
According to the light source device of the invention described in claim 2 of the present application, even when the lamp ruptures, it is possible to prevent the problem that the lamp fragments are scattered from the casing.
[Brief description of the drawings]
FIG. 1 is a perspective view illustrating a structure of a power supply unit at a front end portion of a lamp for explaining a main part of the present invention; FIG. 2 is an explanatory diagram of a structure of a power supply unit viewed from a side of the lamp; FIG. FIG. 4 is a view for explaining a lamp movement restricting means. FIG. 4 is an explanatory view for explaining a method of attaching / detaching a lamp and a power supply plate. FIG. 5 is a side sectional view showing an example of an optical device. Diagram for explaining the holding and power supply structure on the lamp front side in the device
REFERENCE SIGNS LIST 1 lamp 11 rear sealing portion 12 front sealing portion 14 nut 2 base 21 screw portion 3 power supply plate 31 fastening portion 32 engagement hole 4 power supply plate support member 41 engagement protrusion 4a horizontal surface, 4b vertical surface 5 tongue piece member 51 screw 80 casing 81 reflecting mirror 811 neck through hole 82 lamp 821 one sealing end 822 the other sealing end 83 holding mechanism 84 base 841 screw part 85 power supply member 851 power supply plate 852 power supply lead wire 853 connection conductive Plate 84 Cap 86 Nut B Insulating block C2 Casing bottom surface L2 Tube shaft

Claims (2)

A short arc type discharge lamp and a concave reflecting mirror arranged so as to surround the lamp in a state where the direction of the arc of the lamp coincides with the optical axis are housed inside a casing, and one sealed end of the lamp is provided. In the light source device in which the portion is fixed to the position with respect to the casing,
A substantially band-shaped power supply plate extending in a plane direction parallel to the optical axis is fixed to the other sealing end of the lamp,
A power supply plate support member is fixed to the casing,
The power supply plate and the power supply plate support member are provided with an engagement hole on one side and an engagement protrusion on the other side,
The light source device, wherein the power supply plate is supported by the power supply plate support member in a state in which the power supply plate can be slightly moved by an engagement relationship between the engagement hole and the engagement protrusion. The light source device according to claim 1, further comprising a movement restricting unit that prevents the power supply plate from moving more than a predetermined amount.

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