JP3307368B2 - Light source unit manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a light source unit used for video projection equipment and the like.

[0002]

2. Description of the Related Art Conventionally, in such a method of manufacturing a light source unit, as shown in FIG. 6, in order to extract light from a light source close to a point light source with high efficiency, a light emission center between electrodes 5 is arranged on a micron order. Position adjustment (hereinafter, referred to as alignment) of the arc tube 1 positioned at the focal point of the reflector 2 is performed in an actual use state.

That is, in the conventional method of manufacturing a light source unit, an arc tube 1 having a pair of electrodes 5 is arranged in a reflector 2 formed of, for example, a rotating parabolic mirror, and is lit by a lighting device 10. Radiated, reflector 2
The illuminance sensors 19 are provided at the center and four corners via an optical system including an integrator lens 16 for reducing uneven brightness on the screen 3, a field lens 17, and a projection lens 18 for enlarging and projecting the reflected light on the screen 3. Is irradiated on the screen 3 provided with. Next, only the arc tube 1 is moved back and forth and right and left by the precision xy stage 8 with a micrometer so that the illuminance value of the illuminance sensor 19 becomes the maximum value in a well-balanced manner. 2

[0004]

However, in the prior art, the illuminance unevenness on the screen 3 is reduced by the use of the integrator lens 16, while the light emission center between the electrodes 5 is focused in the reflector 2 in the manufacturing process. Even if it deviates from the position, there is a problem that it is difficult to adjust the position of the arc tube 1 in the reflector 2 because the change in illuminance on the screen 3 is small and difficult to understand.

[0005] Further, there is a problem that the apparatus becomes large in size because the position of the arc tube 1 is adjusted in an actual use state.

Furthermore, since the position of the arc tube 1 is adjusted by turning on the arc tube 1, it takes a long time for the luminous flux of the arc tube 1 to stabilize, and there is a problem that the working efficiency is poor.

The present invention has been made in order to solve such a problem, and it is an object of the present invention to provide a method of manufacturing a light source unit in which the position of an arc tube can be easily and accurately adjusted and the apparatus can be downsized.

Another object of the present invention is to provide a method of manufacturing a light source unit capable of adjusting the position of an arc tube efficiently in a short time.

[0009]

According to a method of manufacturing a light source unit of the present invention, light is emitted from an arc tube having a pair of electrodes.
The amount of reflected light reflected by a reflector, which is a rotating parabolic mirror, and further applied to a screen provided in front of the reflector is measured without passing through an optical system used in an actual use state, and the screen is measured. After adjusting the position of the arc tube and the reflector so that the light amount of the brightest part in the light amount distribution of the reflected light irradiated upward is the maximum, the position is corrected by a predetermined amount from the adjusted position. And fixing the arc tube in the reflector.

[0010] Thereby, since the illuminance change on the screen can be clearly understood without passing through the optical system used in the actual use state, the position of the arc tube can be adjusted easily and accurately. Further, the size of the device can be reduced.

Further, according to the method for manufacturing a light source unit of the present invention, the amount of reflected light radiated from an arc tube having a pair of electrodes and reflected by a reflector, which is a spheroidal mirror, is used in an optical system used in an actual use state. A method of fixing the arc tube inside the reflector by measuring at a second focal position of the reflector without passing through a system so that an emission center of the arc tube coincides with a first focal position of the reflector. Used.

[0012] Thereby, since the illuminance change on the screen can be clearly understood without passing through the optical system used in the actual use state, the position of the arc tube can be adjusted easily and accurately. Further, the size of the device can be reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the method for manufacturing a light source unit according to the first embodiment of the present invention includes a light emitting portion 1a and sealing portions 1b provided at both ends of the light emitting portion 1a. And made of quartz glass with a total length of 75 mm and a maximum outer diameter of 11.
An arc tube 1 of 3 mm, a reflector 2 of a rotating parabolic mirror having an opening 2a with a diameter of 75 mm on the front surface, and a distance L from the front end of the reflector 2 on the opening 2a side of the reflector 2, for example. A 1 m × 1 m screen 3 provided at a position of 5 m so as to be perpendicular to the optical axis of the reflector 2, and a light quantity measuring means 4 such as a CCD camera for measuring a luminance distribution on the screen 3. Used.

At both ends of the light emitting section 1a, a pair of electrodes 5 made of tungsten are sealed. Each electrode 5 is connected to an external lead wire 7 via an introduction foil 6 made of molybdenum or the like sealed in the sealing portion 1b. The gap between the electrodes 5 is 1.5 mm.

After the arc tube 1 is placed in the reflector 2 while the end of the sealing portion 1b is held by a jig 9 provided on a precision xy stage 8 with a micrometer (hereinafter referred to as an xy stage). The lighting is performed by the lighting device 10 connected between the external lead wires 7. Reflector 2
Are fixed by a reflector fixture (not shown). Further, the arc tube 1 can be moved back and forth, right and left by the xy stage 8.

The reflected light emitted from the arc tube 1 and reflected by the reflector 2 is applied to a screen 3, and the luminance distribution on the screen 3 irradiated with the reflected light is image-recognized by a light quantity measuring unit 4. The recognized image is processed by a conventionally known image processing device (not shown), and a signal from the image processing device (not shown) is set so that the luminance at the maximum luminance point on the screen 3 is maximized. The xy stage 8 is moved to adjust the position of the arc tube 1 (hereinafter referred to as alignment). By doing so, the emission center between the electrodes 5 is located at the focal point of the reflector 2. After this alignment, the arc tube 1 is fixed in the reflector 2 by an adhesive or the like (not shown), and the light source unit is manufactured.

According to the method of manufacturing the light source unit according to the first embodiment of the present invention, since a complicated optical system such as an integrator lens is not used, the light emission center between the electrodes 5 is located away from the focal point of the reflector 2. Even in the case of deviation, the uneven illuminance on the screen 3 can be clearly recognized, so that alignment can be performed easily and accurately, and the size of the alignment device can be reduced.

The light emission center between the electrodes 5 and the reflector 2
It is preferable that the distance L between the reflector 2 and the screen 3 is not less than a certain value, for example, not less than 5 m, in order to accurately align the position with the focal point.

If the brightness on the screen 3 is too high, the UV-
An IR cut filter and an ND filter may be provided to reduce the irradiation light irradiated on the screen 3.

Further, in the above embodiment, the reflector 2
Is described as a paraboloidal mirror, but the same effect as described above can be obtained with a spheroidal mirror or the like. However, in this case, it is preferable to set the screen 3 at the second focal point of the reflector of the spheroidal mirror.

Next, a method of manufacturing a light source unit according to a second embodiment of the present invention will be described.

As shown in FIG. 1, a distance L between the screen 3 and the tip of the opening 2a of the reflector 2 of the rotating parabolic mirror is shown.
Is reduced to about 1 m, and is performed in the same configuration as the method of manufacturing the light source unit according to the first embodiment of the present invention.

In the same manner as in the method of manufacturing the light source unit according to the first embodiment of the present invention, radiation from the arc tube 1
The light reflected by the reflector 2 is applied to the screen 3. The luminance distribution on the screen 3 irradiated with the reflected light in this way is image-recognized by the light quantity measuring means 4. The recognized image is processed by a conventionally known image processing device (not shown), and the xy stage 8 is moved by a signal from the image processing device so that the value of the maximum luminance point on the screen 3 is maximized. To perform alignment. After this alignment, the luminous tube 1 is moved toward the reflector 2 by a fixed amount, for example, 500 μm, in order to correct the positional deviation between the luminous center between the electrodes 5 and the focal point of the reflector 2, and then the luminous tube 1 is attached to an adhesive or the like. The light source unit is manufactured by fixing the light source unit in the reflector 2 (not shown).

That is, as in the present embodiment, when the distance L between the reflector 2 and the screen 3 is short (less than 5 m), the distance between the electrodes 5 when the value of the maximum luminance point on the screen 3 becomes maximum is obtained. The position of the light emission center is not the position of the focal point of the reflector 2 but a position shifted from the focal position to the side away from the reflector 2. Therefore, the reflector 2 and the screen 3 are set in advance as in the second embodiment of the present invention.
Is small (less than 5 m), how much the position of the light emission center between the electrodes 5 and the position of the focal point deviates is measured, and the position is corrected as a correction amount, that is, moved as a fixed amount to perform correction. By doing so, even if the distance between the reflector 2 and the screen 3 is short, the emission center between the electrodes 5 can be accurately positioned at the focal point.

With the above configuration, when a reflector composed of a rotating parabolic mirror is used, since a complicated optical system such as an integrator lens is not used, alignment can be performed easily and accurately. In addition to the effects of the first embodiment of the present invention, there is a special effect that the entire alignment apparatus can be made smaller.

If the luminance on the screen 3 is too high, a UV-light is applied between the reflector 2 and the screen 3.
An IR cut filter and an ND filter may be provided to reduce the irradiation light irradiated on the screen 3.

Next, a method of manufacturing a light source unit according to a third embodiment of the present invention will be described.

As shown in FIG. 2, the manufacturing method according to the present embodiment includes a light emitting tube 1 and a reflector 2 having the same configuration as the light source unit manufacturing method according to the first embodiment of the present invention. A focusing means 11 comprising a convex lens having a focal length of about 100 mm and provided at a position, for example, 300 mm away from the tip on the side of the opening 2a of the second lens 2 so as to be perpendicular to the optical axis of the reflector 2; And a light amount measuring means 12 comprising a photoelectric conversion element such as an illuminance sensor provided at the focal point of the light source.

The luminous tube 1 is disposed in the reflector 2 while the end of the sealing portion 1b is held by a jig 9 provided on the xy stage 8, and then connected to the external lead wires 7 between the lighting tubes. It is turned on by the device 10. Reflector 2
Are fixed by a reflector fixture (not shown). Further, the arc tube 1 can be moved back and forth, right and left by the xy stage 8.

The parallel reflected light emitted from the arc tube 1 and reflected by the reflector 2 is condensed by the light condensing means 11 at the focal point of the light condensing means 11. The condensed light quantity is measured by the light quantity measuring means 12, and the xy stage 8 is moved so that the illuminance value of the light quantity measuring means 12 is maximized, that is, the emission center between the electrodes 5 is located at the focal point of the reflector 2. To perform alignment. After this alignment, the arc tube 1 is fixed in the reflector 2 by an adhesive or the like (not shown), and the light source unit is manufactured.

With the above configuration, when a reflector composed of a rotating parabolic mirror is used, a complicated optical system such as an integrator lens and a screen are not used, so that alignment can be performed easily.
Since the parallel light can be collected by the light collecting means 11, the size of the alignment apparatus can be further reduced.

If the brightness on the screen 3 is too high, the UV-
An IR cut filter and an ND filter may be provided to reduce the irradiation light irradiated on the screen 3.

When the area of the light receiving portion of the light quantity measuring means 12 is large, a circular hole slit whose diameter is about the distance between the electrodes 5 may be provided between the light collecting means 11 and the light quantity measuring means 12. .

Further, in the above embodiment, the light collecting means 1
Although the case where a convex lens is used as 1 has been described, the same effect as described above can be obtained by using an autocollimator.

Next, a method of manufacturing a light source unit according to a fourth embodiment of the present invention will be described.

As shown in FIG. 3, this manufacturing method is similar to that of the first embodiment of the present invention except that the arc tube 1 has the same configuration as that of the light source unit manufacturing method and that the spheroidal mirror is used. A reflector 13 having the same configuration as that of the method of manufacturing the light source unit according to the first embodiment of the present invention, and a light amount measuring unit 12 comprising a photoelectric conversion element such as an illuminance sensor provided at a second focal point of the spheroid. And are used.

The luminous tube 1 is disposed in the reflector 13 while the end of the sealing portion 1b is held by the jig 9 provided on the xy stage 8, and is connected between the external lead wires 7. It is turned on by the device 10. The reflector 13 is fixed by a reflector fixture (not shown). Further, the arc tube 1 can be moved back and forth, right and left by the xy stage 8.

The parallel reflected light radiated from the arc tube 1 and reflected by the reflector 13 is collected at the second focal point of the spheroid. Light intensity measuring means 1
2, the xy stage 8 is moved so that the illuminance value of the light quantity measuring means 12 is maximized, that is, the luminescent center between the electrodes 5 is located at the focal point of the reflector 13, and alignment is performed. After this alignment, the arc tube 1 is fixed in the reflector 13 with an adhesive or the like (not shown), and the light source unit is manufactured.

With the above configuration, when a reflector including a spheroidal mirror is used, alignment can be performed easily and accurately, and the size of the alignment apparatus can be further reduced.

If the reflected light is applied to the light quantity measuring means 12 too strongly, the reflector 13 and the light quantity measuring means 1
2, a UV-R cut filter and an ND filter may be provided to diminish the irradiation light applied to the light amount measurement unit 12.

Next, a method of manufacturing a light source unit according to a fifth embodiment of the present invention will be described.

As shown in FIG. 4, this manufacturing method includes an arc tube 1 having the same configuration as the light source unit manufacturing method according to the first embodiment of the present invention, a rotating parabolic mirror or a spheroid. When the center of light emission between the reflector 13a composed of a mirror and the electrode 5 is set as the origin and the optical axis of the reflector 13a is set as the z axis, an X-ray fluoroscopic camera or the like provided on the x axis and the y axis with respect to the z axis Position detecting means 14 comprising X-ray fluoroscopic means is used.

The arc tube 1 is disposed in the reflector 13a while the end of the sealing portion 1b is held by the jig 9 provided on the xy stage 8. Reflector 13a
Are fixed by a reflector fixture (not shown). Further, the arc tube 1 can be moved back and forth, right and left by the xy stage 8.

With the arc tube 1 placed in the reflector 13a, the cross-sectional shape of the reflector 13a is image-recognized from two directions by the position detecting means 14 (for example, whether the reflector is a rotating parabolic mirror or a spheroid). Then, the position of the focal point of the reflector 13a and the position of the light emission center between the electrodes 5 are detected. Next, alignment is performed by moving the xy stage 8 so that the emission center between the electrodes 5 is located at the focal point. After this alignment, the arc tube 1 is fixed in the reflector 13a with an adhesive or the like (not shown), and the light source unit is manufactured.

With the above configuration, alignment can be performed without turning on the arc tube 1, so that the time required for the luminous flux of the arc tube 1 to stabilize can be omitted, and alignment can be performed in a short time. Work efficiency can be improved.

Next, a method of manufacturing a light source unit according to a sixth embodiment of the present invention will be described.

As shown in FIG. 5, this manufacturing method includes a light emitting tube 1 having the same configuration as that of the light source unit manufacturing method according to the first embodiment of the present invention, and a rotary discharger whose focal position is known in advance. Position detection comprising a reflector 2 comprising an object mirror and three laser beam irradiation means for irradiating three parallel laser beams passing through the focal point of the reflector 2 and two points spaced from the focal point by half the distance between the electrodes 5. Means 15.

However, this laser beam preferably has a wavelength in the infrared region.

The arc tube 1 is arranged in a reflector while the end of the sealing portion 1b is held by a jig 9 provided on an xy stage 8. The reflector 2 is fixed by a reflector fixture (not shown). Further, the arc tube 1 can be moved back and forth, right and left by the xy stage 8.

By moving the arc tube 1 back and forth, left and right, laser beams passing through the focal point of the reflector 2 are transmitted, and two laser beams from two directions of the x axis and the y axis are reflected by the electrode 5. The xy stage 8 is moved so that the light emission center between the electrodes 5 is located at the focal point of the reflector 2 to perform alignment. After this alignment, the arc tube 1 is fixed in the reflector 2 by an adhesive or the like (not shown), and the light source unit is manufactured.

With the above-described configuration, alignment can be performed without turning on the arc tube 1, so that the time required for the luminous flux of the arc tube to stabilize can be reduced, and alignment can be performed in a short time. Efficiency can be improved.

In this embodiment, the case where the reflector 2 is a paraboloid of revolution has been described. However, the same effect as described above can be obtained even if the reflector 2 is a spheroidal mirror or the like.

[0054]

As described above, the present invention does not use a complicated optical system, so that even if the emission center between the electrodes is shifted from the focal point of the reflector, the illuminance unevenness on the screen can be clearly recognized. Therefore, it is possible to provide a method of manufacturing a light source unit that can easily and accurately perform alignment and that can reduce the size of the alignment device.

[0055]

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a method of manufacturing a light source unit according to first and second embodiments of the present invention.

FIG. 2 is a diagram illustrating a method of manufacturing a light source unit according to a third embodiment of the present invention.

FIG. 3 is a diagram illustrating a method of manufacturing a light source unit according to a fourth embodiment of the present invention.

FIG. 4 is a diagram showing a method of manufacturing a light source unit according to a fifth embodiment of the present invention.

FIG. 5 is a view showing a method of manufacturing a light source unit according to a sixth embodiment of the present invention.

FIG. 6 is a diagram showing a conventional light source unit manufacturing method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Arc tube 2,13,13a Reflector 3 Screen 4,12 Light quantity measuring means 5 Electrode 11 Condensing means 14,15 Position detecting means

Continuation of the front page (56) References JP-A-10-332352 (JP, A) JP-A-4-114140 (JP, A) JP-A-4-110824 (JP, A) JP-A-7-128739 (JP) , A) Actual opening 1987-199718 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F21S 2/00 F21V 13/00 G03B 21/14

Claims (2)

(57) [Claims] 1. A luminous tube having a pair of electrodes, radiated from the arc tube, reflected by a reflector that is a paraboloid of revolution , and further
Illuminates the screen provided in front of the reflector
The amount of reflected light is measured without passing through the optical system used in actual use condition, is irradiated onto the screen the
In the light intensity distribution of the reflected light, the light intensity of the brightest part is
Position of the arc tube and the reflector so as to be maximum
After performing the adjustment, a predetermined amount of position compensation is performed from this adjusted position.
Manufacturing method of the light source unit, characterized in that positive and performing fixing the arc tube within the reflector. 2. A radiant tube having a pair of electrodes.
Reflected by the reflector, which is a spheroidal mirror
Without passing through the optical system used in the actual use condition,
Measured at the second focal point of the reflector,
The light emission center coincides with the first focal position of the reflector.
Then, the arc tube is fixed inside the reflector.
And a method for manufacturing a light source unit.