JP4218329B2 - Light source device - Google Patents

Description

[0001]
BACKGROUND 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 used as a light source for digital light processing using a digital micromirror device.
[0002]
[Prior art]
A new video technology called digital light processing (hereinafter abbreviated as DLP) that uses an optical semiconductor called a digital micromirror device as a core has recently become widely known as a full digital display technology. As a light source used in such image technology, a high-luminance light source is suitable. Recently, a high-pressure xenon short arc lamp is used as a lamp for the light source, together with this and a concave reflecting mirror, in the casing. Used as a combined light source device.
[0003]
For example, when a DC lighting type xenon short arc lamp is used as a light source lamp, the anode is disposed on the light projection window side of the light source device and the cathode is disposed on the back side of the light source device, and the tube axis of the lamp is connected to the light source device. The cathode is fixed to the casing so as to be substantially coincident with the optical axis and the tip of the cathode is coincident with the focal point of the reflecting mirror.
[0004]
Although the DLP device is permanently installed because the device itself is large, when the lamp for the light source is replaced, the lamp is replaced in the state of the light source device incorporated in the casing together with the reflection mirror. According to this, there is an advantage that the position of the lamp can be adjusted with high accuracy in advance with respect to the reflection mirror when the lamp is replaced, and the lamp replacement operation can be easily performed.
[0005]
By the way, in the light source for use such as the DLP device as described above, the light emitted from the light source device determines the illuminance of the image projected on the screen. It is desired to collect light with high efficiency. For this reason, it is important to accurately align the focal position of the reflecting mirror and the apex portion of the cathode tip of the lamp, and it is necessary to adjust carefully when installing the light source lamp.
[0006]
As a light source device capable of adjusting the position of the electrode tip, for example, one described in Japanese Utility Model Publication No. 1-38814 is known. In the technique described in this publication, a lamp holder that holds a light source lamp is urged by a spring, for example, in the left-right direction, and the amount of tightening of an adjustment knob that is screwed against the urging force is increased or decreased. The position adjustment is performed, the entire adjustment knob is moved up and down to adjust the position in the vertical direction, and the position of the electrode tip in all directions is adjusted. According to such a technique, the electrode tip position can be finely adjusted in the front-rear direction in the optical axis direction of the lamp and in all directions on a plane perpendicular to the optical axis.
[0007]
[Patent Literature]
Japanese Utility Model Publication 1-38814
[Problems to be solved by the invention]
Thus, according to the technique described in the above publication, for example, when a xenon lamp with a rated power consumption of 1000 W or more is used, the light source lamp is large, so that the coil spring bends due to vibration and impact, and the adjustment knob is loosened. May deviate from the initial position. If the lamp deviates from a predetermined position, that is, if the spot with the highest luminance in the discharge arc part deviates from the focal point of the reflecting mirror, the light collection efficiency decreases, so the illuminance of light emitted from the light source device decreases and the screen illuminance decreases Resulting in. For this reason, in the light source device which concerns on a prior art, when the position of an electrode tip has shifted | deviated, it has to align again, and there exists a problem that a maintenance operation | work is very complicated.
[0009]
As described above, in the light source device according to the related art, the positional relationship between the light source lamp and the reflecting mirror is easily broken, and it is necessary to perform position adjustment of the light source lamp and the reflecting mirror again and again.
Therefore, the problem to be solved by the present invention is that the position of the lamp and the reflecting mirror can be finely adjusted according to each lamp, and the positional relationship between the lamp and the reflecting mirror after the lamp is aligned. It is an object of the present invention to provide a light source device that can hold a lamp firmly without breaking down.
[0010]
[Means for Solving the Problems]
A light source provided with a reflection mirror fixed in the casing, a light source lamp held so that the optical axis of the reflection mirror substantially matches the optical axis, and a lamp holding mechanism fixed to the bottom of the casing and holding the light source lamp an apparatus, said lamp holding mechanism includes a mounting member that is fixed to the casing bottom made of metal, is projected to the mounting member, disposed a predetermined distance apart provided with a plane extending parallel to each other One and the other clamping part, a fitting member made of metal and fitted and arranged in a separated portion of the one and the other clamping part, and fixed to the fitting member via an insulating member having electrical insulation A power supply member that holds the light source lamp to which a power supply lead wire is connected, and the fitting member is provided with a through-hole in each of the one and the other holding portion and the fitting member. Fits in the holding part In this state, the screw is fastened through the one holding portion, the fitting member, and the other holding portion so that the fitting member is compressed by the holding portion and fixed to the mounting member. In addition, the other members constituting the lamp holding mechanism are also fixed in position by a screw mechanism, and the screws loosely pass through the through holes through which the screws penetrate the respective members constituting the lamp holding mechanism in the screw mechanism. The light source lamp is configured to be movable in a direction parallel to the casing bottom surface and a direction perpendicular to the casing bottom surface based on the fact that the screw is movable in a loose state.
Here, the mounting member is movable in a direction parallel to the casing bottom surface, and the fitting member is a plane in which the holding portion extends parallel to the optical axis of the mirror and perpendicular to the casing bottom surface. It is good to be movable in a direction parallel to the optical axis of the reflecting mirror and a direction perpendicular to the bottom surface of the casing.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory side view showing the entire light source device according to the present invention. As shown in the figure, reflection mirrors R and R ′ are fixed inside a substantially rectangular box-shaped casing C. The optical axis M of the reflection mirror R is positioned substantially parallel to the bottom surface C1 of the casing C, and a light exit window W is formed on the front surface of the casing C. A lamp holding mechanism 10 is fixed in a fixed position by a screw mechanism inside a rear portion of the casing C, and the lamp holding mechanism 10 causes the light source lamp L to have the tube axis of the arc tube substantially coincident with the optical axis M of the reflecting mirror R. So that it is supported horizontally.
[0012]
2 to 3 are explanatory views showing the structure of the lamp holding mechanism 10 in FIG. 1, FIG. 2 is a perspective view showing a state in which the lamp holding mechanism 10 holds the lamp L, and FIG. FIG. 4 is a side view for explaining the holding mechanism 10.
Here, the direction of the optical axis M of the reflection mirror R is X, the direction parallel to the casing C bottom surface C1 and perpendicular to X is Y, the direction perpendicular to the casing C bottom surface C1 (up and down direction) is Z, and so on. To do. Further, θ is a rotation direction around an axis orthogonal to the XY plane.
[0013]
In the present embodiment, the light source lamp L is a DC lighting type short arc xenon lamp in which a cathode E and an anode E ′ are opposed to each other in an arc tube made of quartz glass. In the light source lamp L, the portion exhibiting the highest luminance is in the vicinity of the cathode tip E1 that is separated from the cathode tip E1 to the anode side by a minute distance, and by matching the vicinity of the cathode tip E1 and the focal position of the reflection mirror. High light collection efficiency can be achieved.
[0014]
The lamp holding mechanism 10 is removably attached to the mounting member 11 between the mounting member 11 screwed to the bottom surface C1 of the casing C and the clamping portions 11a and 11b projecting from the mounting member 11. The fitting member 12 is generally constituted by a feeding member 14 fixed to the fitting member 12 with an insulating member 13 interposed between the fitting member 12 and the fitting member 12. The power supply member 14 holds and supplies power to the lamp via a base K attached to the light source lamp L.
[0015]
Through holes 120, 121, 122, 123 through which the shaft portions of the screw members 20, 21, 22, 23 (some of which are not shown) pass freely are provided at the bottom of the mounting member 11, 21, 22, and 23 pass through and are screwed into a pilot hole provided in the casing C. 2 to 3, the screw members that are not visible are not shown.
[0016]
The mounting member 11 is provided with protruding portions 11a and 11b extending in parallel with the ZX plane so as to be separated from each other by a predetermined distance.
As shown in FIG. 3, a fitting member 12 having a width in the Y direction substantially equal to the separation distance of the holding portions 11a and 11b is fitted and attached to the separated portions of the holding portions 11a and 11b. The mounting member 11 is fixed by screw members 30, 31, and 32 inserted into the mounting member 11.
That is, each shaft portion of the screw members 30, 31, and 32 passes through the through-holes 130, 131, and 132 formed in the Y direction in the one holding portion 11a and the fitting member 12, and the other holding portion 11b. It is screwed and fastened to the prepared prepared hole.
When these screw members 30, 31, 32 are firmly screwed to the other holding plate 11 b, the fitting member 12 is pressed and held by the holding portions 11 a, 11 b, so that the position does not move relative to the mounting member 11. It becomes fixed.
[0017]
Since both the mounting member 11 and the fitting member 12 are made of a metal having high rigidity and can fasten the screw member, each member can be stably fixed.
Therefore, the mounting member 11 can be fixed to the casing C, and the fitting member 12 can be fixed to the mounting member 11.
[0018]
The insulating member 13 is made of, for example, a block body made of a ceramic material, a resin material, or a composite material of a ceramic and a resin. (Not shown). The fixing screws N1, N2, N3,... Are screwed into a prepared hole formed in the insulating member 13 through the flange portions 12a, 12b provided in the front-rear direction of the fitting member 12.
A power feeding member 14 is placed on the upper and bottom surfaces of the insulating member 13 and fixed by fixing screws N4, N5,.
With the above configuration, the fitting member 12 and the power feeding member 14 are fixed in position through the insulating member 13.
[0019]
The power supply member 14 is made of a metal that is a good electrical conductor, such as copper. The power supply member 14 is provided with a substantially plate-shaped base holding part 140 extending in the plane direction parallel to the YZ plane, and the end of the base K attached to the light source lamp L is inserted into the insertion hole 141. Mechanically and electrically connected. As a result, the light source lamp L is supported in a horizontal posture.
The power supply member 14 is electrically connected to a power supply lead 40 connected to an external power source (not shown), and power supply to the light source lamp L is achieved.
[0020]
Here, the mounting member 11, the fitting member 12, and the power feeding member 14 are all made of a metal member and have conductivity, but the insulating member 13 is interposed between the power feeding member 14 and the fitting member 12. The fitting member 12 is not affected electrically, and an accident such as a ground fault through the casing C can be prevented.
[0021]
FIG. 5 is a plan view of the mounting member 11 in the lamp holding mechanism 10 as viewed from the top of the light source lamp L in the Z direction. As shown in the figure, the through holes 120, 121, 122, 123 of the mounting member 11 are formed larger than the outer diameters of the shaft portions 20 ′, 21 ′, 22 ′, 23 ′ of the screw member. The light source lamp L can be moved by a minute distance on the XY plane in the range of the gap through which the shaft portions 20 ′, 21 ′, 22 ′, 23 ′ pass.
Therefore, if the screw members 20, 21, 22, 23 are loosened, the mounting member 11 can be moved on the XY plane according to the size of the loose portion of the through hole. The position in the vicinity of the cathode tip E1 of the lamp L can be finely adjusted so as to coincide with the focal point of the reflection mirror R. If the screw members 20, 21, 22, and 23 are fastened after the cathode tip E1 is positioned, the light source lamp L can be fixed to the casing, and as described above, the mounting member 11 Since is made of metal, the screw members 20, 21, 22, 23 can be firmly fastened, and the positional relationship between the light source lamp L and the reflection mirror R can be stably maintained.
[0022]
In general, a light source lamp may have a positional relationship between the cathode tip E1 and the base K which is different in a minute range from the manufacturing process of each lamp, and even a slight deviation of 0.5 mm leads to a decrease in illuminance. Therefore, it is necessary to make it possible to finely adjust the position of the light source lamp L in order to achieve alignment with the focal position of the reflecting mirror R. Here, since the deviation between the focal position of the reflecting mirror R and the cathode tip E1 is at most ± 0.2 mm, the through holes 120, 121, 122, 123 and the shaft portions 20 ′, 21 ′, 22 ′, 23 It is possible to make sufficient corrections by providing play with '. Specifically, by forming a play of about 1.5 to 3.0 mm, the cathode tip E1 and the focal position of the reflecting mirror R can be accurately matched.
[0023]
Furthermore, the positional relationship between the cathode tip E1 of the lamp and the lamp holding mechanism 10 is likely to shift in the lamp tube axis direction, so that it is preferable that the play is large in the lamp tube axis direction. According to the embodiment described above, the tube axis of the light source lamp coincides with the direction of the optical axis M (that is, the X direction), so that the through holes 120, 121, 122, 123 of the mounting member 11 are provided as shown in FIG. Is preferably provided in a substantially oval shape so as to be larger in the X direction. Specifically, it is preferable to form a play of ± 3 mm in the X direction and ± 1.5 mm in the Y direction.
Note that, as in the present embodiment, a pilot hole for fixing the screw members 20, 21, 22, and 23 is formed on the casing bottom surface C <b> 1, and the screw members 20, 21, 22, and 23 pass through one mounting member 11. When the through holes 120, 121, 122, 123 are formed so as to provide play, the screw members 20, 21, 22, 23 are positioned and placed on the casing bottom surface C1 when the position of the cathode tip E1 is adjusted. Since the movement of the member 11 is regulated, the workability can be improved.
[0024]
FIG. 6 is a cross-sectional view illustrating the lamp holding mechanism cut along the ZX plane within the range of the fitting member in the width direction.
As shown in the figure, the through holes 130, 131, 132 formed in the fitting member 12 are formed larger than the outer diameters of the shaft portions 30 ′, 31 ′, 32 ′ of the screw member. Thus, by providing play in the through holes 130, 131, 132 so that the shaft portions 30 ′, 31 ′, 32 ′ penetrate freely, the fitting member 12 can move in the ZX plane direction. .
Therefore, if the fastening state of the screw member is loosened, the fitting member 12 can be moved in any direction on the ZX plane and can move in the X direction, Z direction, X direction and θ direction of the light source lamp L. It is possible to finely adjust the position of the cathode tip E1. Here, a play of about ± 1.5 mm in the Z direction and about ± 1.5 mm in the X direction is provided between the screw through holes 130, 131, 132 of the fitting member 12 and the shaft portions 30 ′, 31 ′, 32 ′. Is preferred.
[0025]
Thus, since the fitting member 12 can move only in the ZX plane direction in a state where movement in the Y direction is restricted, when the screw member of the mounting member 11 is tightened after determining the position in the Y direction, The positioning operation of the cathode tip E1 can be easily performed. After the position adjustment in the ZX plane direction is finished, the screw member may be firmly fastened to fix the lamp.
[0026]
Since the mounting member 11 and the fitting member 12 are made of a highly rigid metal member as described above, the screw member can be firmly fastened and the positional relationship between the two can be stably maintained.
[0027]
According to the light source device according to the above-described embodiment, the mounting member 11 of the lamp holding member 10 can move by a minute distance in the XY plane direction with respect to the casing bottom surface C1, and the fitting member 12 further includes the mounting member. 11 is movable in the Z direction and the θ direction, the cathode tip E1 can be accurately positioned with respect to the reflecting mirror M fixed to the casing. The members (11, 12, 13, 14) for constituting the lamp holding mechanism 10 are firmly fastened using a screw member and a fixing screw without using a coil spring or the like. The positional relationship between the mirror R and the light source lamp L can be stably maintained from the initial state, and it is difficult to cause a problem that the position of the light source lamp L is shifted.
[0028]
As described above, according to the light source device of the present invention, since the light source lamp can be firmly held, the problem of the positional relationship between the cathode tip and the focal point of the reflecting mirror is unlikely to occur, and the lamp is aligned. Is no longer necessary.
[0029]
In the present invention explained above, it can change suitably, without being limited to the composition of the above-mentioned embodiment. For example, in the lamp holding mechanism, the screw member may be screwed using a nut and fastened, or a seat spring or the like may be fitted as appropriate. The light source lamp is not limited to the DC lighting type, and may be an AC lighting type lamp. When adjusting the positions of the light source lamp and the reflection mirror, an XYZ stage device or the like may be used as appropriate.
[0030]
【The invention's effect】
According to the light source device of the present invention, the position of the cathode tip can be adjusted in a minute range by aligning the light source lamp and the reflection mirror with each lamp, so that the alignment of the light source lamp and the reflection mirror can be accurately performed. Can be performed. In addition, since the lamp can be firmly held after the position of the light source lamp is adjusted, the light source device can be provided in which the position of the lamp can be stably maintained and the screen illuminance can always be kept high.
[Brief description of the drawings]
FIG. 1 is an explanatory side view showing an entire light source device according to the present invention.
FIG. 2 is a perspective view showing a structure of a lamp holding mechanism of the light source device according to the present invention.
FIG. 3 is a perspective view for explaining the main part of the constituent members of the lamp holding mechanism of the light source device according to the present invention.
FIG. 4 is a side view for explaining a lamp holding mechanism of the light source device according to the present invention.
FIG. 5 is a plan view of the mounting member of the lamp holding mechanism according to the present invention as viewed from above the light source lamp.
6 is a cross-sectional view for explaining a main part of the lamp holding mechanism cut along a broken line AA ′ shown in FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Lamp holding mechanism 11 Mounting member 11a, 11b Clamping part 12 Fitting member 12a, 12b Flange part 20, 21, 22, 23, 30, 31, 32 Screw member 13 Insulating member 14 Power supply member 140 Base holding part 141 Insertion hole N1, N2, N3, N4, N5 Fixing screw 40 Feed lead E Cathode E1 Cathode tip E 'Anode L Light source lamp K Base R, R' Reflection mirror M Reflection mirror optical axis C Casing C1 Casing bottom W Light exit window

Claims (2)

A light source provided with a reflection mirror fixed in the casing, a light source lamp held so that the optical axis of the reflection mirror substantially matches the optical axis, and a lamp holding mechanism fixed to the bottom of the casing and holding the light source lamp A device,
The lamp holding mechanism is
A mounting member that is fixed to the casing bottom made of metal,
One and the other sandwiching portion provided on the mounting member and provided with planes extending parallel to each other and spaced apart by a predetermined distance;
A fitting member made of metal and fitted and arranged in a separated portion of the one and the other holding part;
A power supply member that is fixed to the fitting member via an insulating member having electrical insulation, and that holds the light source lamp to which a lead wire for power supply is connected;
A through hole is provided in each of the one and the other holding part and the fitting member,
When the fitting member is fitted to the holding portion, the screw is passed through one of the holding portions, the fitting member, and the other holding portion and fastened, so that the fitting member becomes the holding portion. While being narrowed and fixed to the mounting member,
Other members constituting the lamp holding mechanism are also fixed in a fixed position by a screw mechanism,
Based on the fact that the screw mechanism is formed so that the screw penetrates through each member constituting the lamp holding mechanism in the screw mechanism so that the screw penetrates freely, and the screw is movable in a loose state.
The light source device is characterized in that the light source lamp is movable in a direction parallel to the bottom surface of the casing and in a direction perpendicular to the bottom surface of the casing. The mounting member is movable in a direction parallel to the casing bottom surface,
The fitting member includes a plane in which the sandwiching portion extends parallel to the optical axis of the mirror and perpendicular to the bottom surface of the casing, so that the fitting member is perpendicular to the optical axis of the reflection mirror and perpendicular to the bottom surface of the casing. The light source device according to claim 1, wherein the light source device is movable in any direction.

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