JPH10332352A - Light source alignment detecting optical device, light alignment regulating device using it, and illuminating optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source alignment detecting optical device by which displacement from an optimum position for a lamp can be detected with high precision, a light source alignment regulating device using it, and an illuminating optical device. SOLUTION: This device is provided with a light source 103 including a lamp 101 and a first reflector 102, a second reflector 104 with the same shape as the first reflector 102, and a light detection part 105 arranged in the highest light intensity position of the lamp 101 on the reflection face side of the second reflector 104. On an optical axis 107 of the lamp 101, the optical detection part 105 and the second reflector 104 are arranged, while the reflection face of the first reflector 102 is opposed to the reflection face of the second reflector 104. Therefore, light flux incident on the light detection part 105 is reduced when the position of the lamp 101 to the first reflector 102 is deflected from the optimum position, so that a positional error of the lamp 101 can be checked easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source alignment detecting optical device for confirming and adjusting the coaxiality of a lamp and a reflector when assembling a light source including a lamp and a reflector, for example.

[0002]

2. Description of the Related Art As an example of alignment adjustment between a lamp and a reflector of an illumination optical device including a lamp and a reflector, adjustment of a lamp and a reflector used in a liquid crystal projector is proposed in Japanese Patent Laid-Open No. Hei 5-313117. .

According to this adjustment, the direction of light emission from the reflector is defined as a Z-axis direction, and orthogonal directions in a plane perpendicular to the Z-axis are defined as an X-axis direction and a Y-axis direction, respectively. The lamp is positioned in the Z-axis direction such that the illuminance of the irradiation light on the screen by the emitted light is maximized and the light amount ratio between the center and the periphery on the screen is minimized. Next, the lamp is moved in the X-axis direction or the Y-axis direction, and the position of the lamp in the X-axis direction or the Y-axis direction is adjusted so that the maximum illuminance position of the irradiation light on the screen by the emitted light becomes the center. To perform positioning.

[0004]

However, the above-described alignment adjustment has the following problems. (1) Determine the ratio of the light intensity between the center and the periphery on the screen,
The liquid crystal projector main body is required for adjustment such as adjusting the position of the lamp so as to obtain the maximum illuminance position at the center on the screen. (2) A space for disposing the liquid crystal projector and the screen is required. (3) When a lens array is provided in the optical system of the liquid crystal projector to reduce uneven light distribution of the lamp, the illuminance distribution on the screen even if the position of the lamp is considerably deviated from the optimum position. The deterioration of the characteristics is small and it is difficult to grasp the optimum position of the lamp.

The present invention has been made to solve the above problems, and does not require a large device such as a liquid crystal projector or a screen, and can detect a deviation of a lamp from an optimum position with high accuracy. It is an object of the present invention to provide a light source alignment adjusting device and an illumination optical device.

[0006]

In order to achieve the above object, a first light source alignment detecting optical device of the present invention comprises a light source including a lamp and a first reflector, and a light source including a lamp and a first reflector. A second reflector having a shape, and a light detector disposed on a reflection surface side of the second reflector, wherein the light detector and the second reflector are disposed on an optical axis of the lamp; The reflection surface of the first reflector and the reflection surface of the second reflector face each other.

According to the first light source alignment detecting optical device of the present invention, when the position of the lamp with respect to the first reflector deviates from the optimum position, the amount of light incident on the light detecting section is reduced. Position errors can be easily confirmed.

Next, a second light source alignment detecting optical device according to the present invention comprises a light source including a lamp and a reflector, a refractive optical system having substantially the same optical characteristics as the reflector,
A light detecting section, wherein the light detecting section and the refractive optical system are arranged on an optical axis of the lamp, and a reflecting surface of the reflector faces the refractive optical system. According to the second light source alignment detecting optical device of the present invention, when the position of the lamp with respect to the first reflector deviates from the optimum position, the amount of light incident on the light detecting unit is reduced. Can be easily confirmed. Further, since the light detection unit can be arranged at a position distant from the refractive optical system, a degree of freedom is obtained in the configuration and operability is improved.

In the first or second light source alignment detecting optical device, it is preferable that the light detecting section includes a plurality of light detectors on the same optical axis.
With the above-described configuration, the change in the displacement of the maximum light intensity position can be confirmed by observing and comparing the outputs of the plurality of photodetectors, so that the error in the position of the lamp can be accurately and easily confirmed.

[0010] Further, the photodetecting section includes a plurality of photodetectors having a plurality of photodetectors arranged in a plane perpendicular to the optical axis, and each of the photodetectors is arranged on the optical axis. Is preferred. With the above configuration, when the position of the lamp deviates from the optimum position, a change in the deviation of the maximum light intensity position can be confirmed by observing and comparing the outputs of a plurality of photodetectors. Even if the dimension is shifted, the situation can be easily confirmed.

In the first light source alignment detecting optical device, the reflecting surfaces of the first reflector and the second reflector are formed by elliptical mirrors, and the lamp is a first focal point of the first reflector. And a second focus position of the first reflector and a second focus position of the second reflector are arranged at a position where the second focus position of the first reflector overlaps with the second focus position of the second reflector. Preferably, they are arranged.

In a first light source alignment detecting optical device in which the reflecting surface of the reflector is formed by an ellipsoidal mirror, the light detecting section includes a plurality of light detectors on the same optical axis, It is preferable that the arrangement position of the photodetector at a substantially central portion in the optical axis direction of the portion is a position overlapping the first focal position of the second reflector.

Further, in the first light source alignment detecting optical device, the first reflector and the second
The reflector is formed by a parabolic mirror, the lamp is arranged at the focal position of the first reflector, and the arrangement position of the light detection unit is the focal position of the second reflector. Is preferred.

In a first light source alignment detecting optical device in which the reflecting surface of the reflector is formed by a parabolic mirror, the light detecting section includes a plurality of light detectors on the same optical axis, It is preferable that an arrangement position of the photodetector at a substantially central portion of the detection unit in the optical axis direction is a focal position of the second reflector.

In the second light source alignment detecting optical device, the reflecting surface of the reflector is formed by an ellipsoidal mirror, the lamp is disposed at a first focal point of the reflector, and the arrangement of the refractive optical system is provided. The position is a position where the second focal position of the reflector and a position twice as long as the focal length of the refractive optical system from the front principal point position of the refractive optical system overlap, and the arrangement position of the light detection unit is It is preferable that the apparatus be located at the same magnification position as the refractive optical system in order to reduce the size of the apparatus.

In a second light source alignment detecting optical device in which the reflecting surface of the reflector is formed by an ellipsoidal mirror, the light detecting section includes a plurality of light detectors on the same optical axis, It is preferable that the arrangement position of the photodetector at a substantially central portion in the optical axis direction of the portion is the same magnification position of the refractive optical system.

Further, in the second light source alignment detecting optical device, the reflecting surface of the reflector is formed by a parabolic mirror, the lamp is arranged at a focal position of the reflector, and the arrangement of the light detecting unit is performed. Preferably, the position is a focal position of the refractive optical system.

In a second light source alignment detecting optical device in which the reflecting surface of the reflector is formed by a parabolic mirror, the light detecting section includes a plurality of light detectors on the same optical axis, It is preferable that an arrangement position of the photodetector at a substantially central portion in the optical axis direction of the detection unit is a focal position of the refractive optical system.

In the first or second light source alignment detecting optical device, it is preferable that the light detecting section is movable on an optical axis. According to the above configuration, when the lamp deviates from the optimum position, a change in the deviation of the maximum light intensity position can be confirmed by observing and comparing the output while moving the light detection unit. Can be easily confirmed.

Next, a light source alignment adjusting device according to the present invention is a light source alignment adjusting device including the first or second light source alignment detecting optical device,
It is preferable to provide a three-dimensional driving device capable of three-dimensionally adjusting the position of the lamp with respect to the optical axis. According to the light source alignment adjusting device as described above, the position of the lamp can be adjusted three-dimensionally in accordance with the signal from the light detection unit, so that a light source with good illuminance distribution can be obtained.

In the light source alignment adjusting device, it is preferable that the three-dimensional driving device is driven so that the signal output from the light detecting unit is maximized to adjust the position of the lamp.

Next, it is preferable that the illumination optical device of the present invention includes a light source whose alignment has been adjusted using the light source alignment adjusting device. According to the illumination optical device as described above, since the alignment between the lamp and the reflector is optimized by the light source alignment adjusting device,
Illumination with good symmetry is possible in the illuminated area.

Also, the liquid crystal projector device of the present invention
It is preferable that a light source whose alignment is adjusted by using the light source alignment adjusting device is provided. According to the liquid crystal projector described above, since the alignment between the lamp and the reflector is optimized by the light source alignment adjusting device, the liquid crystal panel is illuminated well, and the brightness of the image projected on the screen is also improved. Can be distributed.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a layout diagram showing a schematic configuration of a light source alignment detecting optical device according to Embodiment 1 of the present invention. A light source 103 having a lamp 101 and a first reflector 102 is arranged on an optical axis 107. As the lamp 101, a halogen lamp, a mercury lamp, a metal halide lamp, or the like is used.

A light source alignment detecting section 106 is arranged at a position facing the light source 103. The light source alignment detection unit 106 includes a second reflector 104 and a light detection unit 105 having the same shape as the first reflector 102.

The light detecting section 105 includes the first reflector 10
2 is located at the maximum light intensity position corresponding to the designed position of the lamp 101 with respect to 2. For example, when the reflection surfaces of the first and second reflectors 102 and 104 are formed by elliptical mirrors and the lamp 101 is disposed at the first focal point of the first reflector 102, the light beam emitted from the lamp 101 The light is focused on the second focal point of the first reflector 102.

Therefore, if the second reflector 104 is disposed so that the second focal point of the second reflector 104 overlaps the second focal point of the first reflector 102, the second reflector 104 is positioned at the first focal point of the second reflector 104. The light beam from the lamp is collected again. If the light detection unit 105 is arranged at this position, the light detection unit 105 is arranged at the maximum light intensity position.

The first and second reflectors 102, 1
If the lamp 04 is formed of a parabolic mirror and the lamp is located at the focal point of the first reflector 102, the lamp 101
Are emitted from the first reflector 102 as parallel light beams.

Therefore, if the second reflector 104 is arranged on the same optical axis 107, the second reflector 104
The collimated light beam incident on the second reflector 104 is condensed by the light beam from the lamp 101 at the focal position of the second reflector 104. If the light detection unit 105 is arranged at this position, the light detection unit 105 is arranged at the maximum light intensity position.

As described above, according to the first embodiment, the first
When the position of the lamp 101 with respect to the reflector 102 deviates from the optimum position, the amount of light incident on the light detection unit 105 decreases, so that an error in the position of the lamp 101 can be easily confirmed.

(Embodiment 2) FIG. 2 is a layout diagram schematically showing the configuration of a light source alignment detecting optical device according to Embodiment 2 of the present invention. Lamp 101 and reflector 201
Is provided on the optical axis 107. A light source alignment detector 20 including a refractive optical system 203 and a light detector 105 at a position facing the light source 202.
4 are arranged.

The refractive optical system 203 has substantially the same optical characteristics as the reflector 201. Substantially the same optical characteristic means that elements such as a focal length, an aberration characteristic, and an aperture diameter are substantially equal. The light detection unit 105 is arranged at a maximum light intensity position corresponding to a designed position of the lamp 101 with respect to the reflector 201.

For example, when the reflector 201 is formed by an ellipsoidal mirror and the lamp 101 is arranged at the first focal point of the reflector 201, the light beam emitted from the lamp 101 is focused at the second focal point of the reflector. Therefore, if the refractive optical system 203 is arranged such that a position twice as long as the focal length of the refractive optical system 203 from the front principal point of the refractive optical system 203 overlaps the second focal point of the reflector 202, the refractive optical system 203 The light beam from the lamp 101 is condensed again at the same magnification position of. If the light detection unit 105 is arranged at this position,
The light detection unit 105 is arranged at the maximum light intensity position.

When the reflector 201 is formed of a parabolic mirror and the lamp 101 is located at the focal point of the reflector 202, the light beam emitted from the lamp 101 is emitted from the reflector 201 as a parallel light beam. Therefore, if the refractive optical system 204 is disposed on the same optical axis 107, the parallel light beam incident on the refractive optical
The light beam from the lamp 101 is condensed at the focal position 04.
If the light detection unit 105 is arranged at this position, the light detection unit 105 is arranged at the maximum light intensity position.

As described above, according to the second embodiment, when the position of the lamp 101 with respect to the reflector 201 deviates from the optimum position, the amount of light incident on the light detection unit 105 decreases. It can be easily confirmed. Furthermore, when a reflector is used for the light source alignment detection unit, the light detection unit is disposed inside the reflector, but when a refraction optical system is used, the light detection unit can be disposed at a position away from the refraction optical system. Therefore, a degree of freedom is obtained in the configuration, and the operability is improved.

(Embodiment 3) FIG. 3 is a layout view schematically showing a configuration of a light source alignment detecting optical device according to Embodiment 3. The light source 103 has the same configuration as that of the first embodiment, and is arranged on the optical axis 107. Light source 103
A second reflector 104 having the same shape as the first reflector 102 and a plurality of photodetectors 301, 3
A light source alignment detection unit 305 including a light detection unit 304 including the light sources 02 and 303 is disposed.

The light detecting section 304 is provided for the first reflector 10
At the maximum light intensity position corresponding to the designed position of the lamp 101 with respect to 2, a photodetector 302, that is, a photodetector 302 substantially at the center of the photodetector 304 in the direction of the optical axis 107 is arranged. For example, if the first and second reflectors 102, 104 are formed by elliptical mirrors and the lamp 101 is located at the first focal point of the first reflector 102, the lamp 10
The light beam emitted from 1 is focused on the second focal point of the first reflector 102.

Therefore, if the second reflector 104 is arranged so that the second focal point of the second reflector 104 overlaps the second focal point of the first reflector 102, the second reflector 104 can be positioned at the first focal point of the second reflector 104. The light beam from the lamp 101 is collected again. If the photodetector 302 is arranged at this position, the photodetector 302 will be arranged at the maximum light intensity position.

The first and second reflectors 102, 1
If the lamp 04 is formed of a parabolic mirror and the lamp 101 is located at the focal point of the first reflector 102, the lamp 10
The light beam emitted from 1 is emitted from the first reflector 102 as a parallel light beam.

Therefore, if the second reflector 104 is arranged on the same optical axis 107, the parallel light beam incident on the second reflector 104 is condensed by the light beam from the lamp 101 at the focal position of the second reflector 104. . If the photodetector 302 is arranged at this position, the photodetector 302 will be arranged at the maximum light intensity position.

As described above, according to the third embodiment, the first
When the position of the lamp 101 with respect to the reflector 102 deviates from the optimum position, the change in the deviation of the maximum light intensity position formed by the second reflector 104 can be confirmed by observing and comparing the outputs of a plurality of photodetectors. In addition, the error of the position of the lamp can be accurately and easily confirmed.

FIG. 4 is an arrangement diagram schematically showing a configuration in the case where a refractive optical system is used for the light source alignment detecting section. The light source 202 has the same configuration as that of the second embodiment, and is arranged on the optical axis 107. Opposed to the light source 202, a light source alignment detection unit 405 including a refractive optical system 203 and a light detection unit 404 including a plurality of light detectors 401, 402, and 403 is arranged.

The refractive optical system 203 has substantially the same optical characteristics as the reflector 201. Substantially the same optical characteristics mean that elements such as a focal length, an aberration characteristic, and an aperture diameter are approximately equal. The light detector 404 is provided with a light detector, that is, a light detector 402 substantially at the center of the light detector 404 in the direction of the optical axis 107 at the maximum light intensity position corresponding to the designed position of the lamp 101 with respect to the reflector 201. ing. For example, the reflector 201 is formed of an ellipsoidal mirror, and the lamp 1
When 01 is arranged at the first focal point of the reflector 201, the light beam emitted from the lamp 101 is focused on the second focal point of the first reflector 201.

Therefore, if the refractive optical system 203 is arranged so that a position twice as long as the focal length of the refractive optical system 203 from the front principal point of the refractive optical system 203 overlaps the second focal point of the reflector 201, The light flux from the lamp is focused again at the same magnification position of the optical system 203. If the photodetector 402 is arranged at this position, the photodetector 40 is located at the maximum light intensity position.
2 will be arranged.

When the reflector 201 is formed of a parabolic mirror and the lamp 101 is disposed at the focal point of the reflector 201, the light beam emitted from the lamp 101 is emitted from the reflector 201 as a parallel light beam. Therefore, if the refractive optical system 203 is arranged on the same optical axis 107, the parallel light beam incident on the refractive optical system
The light flux from the lamp 101 is focused on the focal position 03.
If the photodetector 402 is arranged at this position, the photodetector 402 will be arranged at the maximum light intensity position.

With the above arrangement, when the position of the lamp 101 with respect to the reflector 201 deviates from the optimal position, the change in the deviation of the maximum light intensity position formed by the refracting optical system 203 is detected by a plurality of photodetectors. Can be confirmed by observing and comparing the outputs of the lamps, so that errors in the position of the lamp can be confirmed accurately and easily. Furthermore, when a reflector is used for the light source alignment detection unit, the light detection unit is arranged inside the reflector, but when a refraction optical system is used, the light detection unit may be arranged at a position away from the refraction optical system. Since it is possible, the degree of freedom in the configuration is obtained, and the operability is improved.

(Embodiment 4) FIG. 5 is a layout diagram schematically showing the configuration of a light source alignment detecting optical device according to Embodiment 4. The light source 103 has the same configuration as that of the first embodiment, and is arranged on the optical axis 107. A light source alignment detection unit 503 including a second reflector 104 having the same shape as the first reflector 102 and a light detection unit 501 is arranged at a position facing the light source 103. The light detection unit 501 is movable on the optical axis 107 in a direction indicated by an arrow 502.

Lamp 1 for first reflector 102
At the maximum light intensity position corresponding to the design position of No. 01, the approximate center of the movement range of the light detection unit 501 in the direction of the arrow 502 is located. For example, the first and second reflectors 102, 10
When the lamp 4 is formed by an ellipsoidal mirror and the lamp 101 is arranged at the first focal point of the first reflector 102, the light beam emitted from the lamp 101 is focused on the second focal point of the first reflector 102.

Therefore, if the second reflector 104 is arranged such that the second focal point of the second reflector 104 overlaps the second focal point of the first reflector 102, the second reflector 104 is positioned at the first focal point of the second reflector 104. The light beam from the lamp 101 is collected again. If a substantially central portion of the moving range of the light detecting unit 501 in the direction of the arrow 502 is disposed at this position, a substantially central portion of the moving range of the light detecting unit 501 in the direction of the arrow 502 will be disposed at the maximum light intensity position. .

The first and second reflectors 102, 1
If the lamp 04 is formed of a parabolic mirror and the lamp 101 is located at the focal point of the first reflector 102, the lamp 10
The light beam emitted from 1 is emitted from the first reflector 102 as a parallel light beam.

Therefore, if the second reflector 104 is arranged on the same optical axis 107, the parallel light beam incident on the second reflector 104 is converged by the light beam from the lamp 101 at the focal position of the second reflector 104. . If the approximate center of the movement range of the light detection unit 501 in the direction of the arrow 502 is located at this position, the arrow 5 of the light detection unit 501 is located at the maximum light intensity position.
A substantially central portion of the movement range in the 02 direction is arranged.

As described above, according to the fourth embodiment, when the position of the lamp 101 with respect to the first reflector 102 deviates from the optimum position, the change in the deviation of the maximum light intensity position formed by the second reflector 104 is determined. Since the output can be confirmed by observing and comparing the output while moving the light detection unit 501 in the direction of the arrow 502, an error in the position of the lamp can be easily confirmed.

FIG. 6 is an arrangement diagram schematically showing a configuration in the case where the refractive optical system 203 is used for the light source alignment detecting section. The light source 202 has the same configuration as that of the second embodiment, and is arranged on the optical axis 107. A light source alignment detection unit 603 including a refractive optical system 203 and a light detection unit 601 that can move in the direction of an arrow 602 on the optical axis 107 is disposed at a position facing the light source 202.

The refractive optical system 203 has substantially the same optical characteristics as the reflector 201. That is, the refractive optical system 203
The reflector 201 has substantially the same elements as the reflector 201, such as the focal length, aberration characteristics, and aperture diameter. Further, the light detection unit 601 is disposed at the maximum light intensity position corresponding to the designed position of the lamp 101 with respect to the reflector 201.

For example, when the reflector 201 is formed by an ellipsoidal mirror and the lamp 101 is arranged at the first focal point of the reflector 201, the light beam emitted from the lamp 101 is focused at the second focal point of the reflector 201.

Therefore, if the refractive optical system 203 is arranged so that a position twice as long as the focal length of the refractive optical system 203 from the front principal point of the refractive optical system 203 overlaps the second focal point of the reflector 201, The light beam from the lamp 101 is focused again at the same magnification position of the optical system 203. If the approximate center of the moving range of the light detecting unit 601 in the direction of the arrow 602 is arranged at this position, the approximate center of the moving range of the light detecting unit 601 in the direction of the arrow 602 is arranged at the maximum light intensity position. .

When the reflecting surface of the reflector 201 is formed by a parabolic mirror and the lamp 101 is located at the focal point of the reflector 201, the light beam emitted from the lamp 101 is emitted from the reflector 201 as a parallel light beam.

Therefore, if the refracting optical system 203 is arranged on the same optical axis 107, the collimated light beam incident on the refracting optical system 203 is condensed at the focal position of the refracting optical system 203 from the lamp 101. If the approximate center of the moving range of the light detecting unit 601 in the direction of the arrow 602 is arranged at this position, the approximate center of the moving range of the light detecting unit 601 in the direction of the arrow 602 is arranged at the maximum light intensity position. .

With such a configuration, when the position of the lamp 101 with respect to the reflector 201 deviates from the optimum position, the change in the deviation of the maximum light intensity position formed by the refracting optical system 203 is detected by the light detection unit 601. Since the output can be confirmed by observing and comparing the output while moving in the direction of the arrow 602, an error in the position of the lamp 101 can be easily confirmed.

(Embodiment 5) FIG. 7 is a layout view schematically showing the configuration of a light source alignment detecting optical device according to Embodiment 5 of the present invention. The light source 103 has the same configuration as that of the first embodiment, and is arranged on the optical axis 107. Light source 10
3 and a second reflector 102 having the same shape as the first reflector 102.
And a light source alignment detection unit including a light detection unit 704 disposed on the reflection surface side of the second reflector 104.

The light detector 704 includes a plurality of light detectors 701, 702 and 703 arranged on the optical axis 107. Each photodetector includes a plurality of photodetectors arranged in a plane perpendicular to the optical axis 107.

The lamp 1 for the first reflector 102
At the maximum light intensity position corresponding to the design position of No. 01, a substantially central portion of the light detection unit 704 in the direction of the optical axis 107, that is, the light detector 702 is arranged. For example, the reflecting surfaces of the first and second reflectors 102 and 104 are formed by elliptical mirrors,
When the lamp 101 is located at the first focal point of the first reflector 102, the light beam emitted from the lamp 101 is focused at the second focal point of the first reflector 102.

Therefore, if the second reflector 104 is arranged so that the second focal point of the second reflector 104 overlaps the second focal point of the first reflector 102, the second reflector 104 is positioned at the first focal point of the second reflector 104. The light beam from the lamp 101 is collected again. If the photodetector 702 is arranged at this position, the photodetector 702 will be arranged at the maximum light intensity position.

The first and second reflectors 102, 1
In the case where the reflecting surface of 04 is formed by a parabolic mirror and the lamp 101 is arranged at the focal point of the first reflector 102,
The luminous flux emitted from the lamp 101 is the first reflector 10
Emitted from 2 as a parallel light beam. Therefore, if the second reflector 104 is disposed on the same optical axis 107, the parallel light beam incident on the second reflector 104 is condensed by the light beam from the lamp 101 at the focal position of the second reflector 104. If the photodetector 702 is arranged at this position, the photodetector 702 will be arranged at the maximum light intensity position.

With such a configuration, when the position of the lamp 101 with respect to the first reflector 102 deviates from the optimum position, a change in the maximum light intensity position formed by the second reflector 104 is changed. Can be confirmed by observing and comparing the outputs of the photodetectors, so that the error in the position of the lamp 101 can be confirmed accurately and easily. Further, since the light detection unit 704 includes a plurality of light detectors, and the light detectors have a plurality of light detection elements arranged in a plane perpendicular to the optical axis, the positions of the lamps are three-dimensionally shifted. Even in such a case, the situation can be easily confirmed.

FIG. 8 is a plan view showing an example of a state in which a plurality of light detecting elements 801 are arranged on a plane when the light detector 701 is viewed from the optical axis 107 direction. FIG.
FIG. 5 is a layout diagram schematically illustrating a configuration in the case where a refractive optical system is used for a light source alignment detection unit. The light source 202 has the same configuration as that of the second embodiment, and is arranged on the optical axis 107. A light source alignment detection unit including a refraction optical system 203 having substantially the same optical characteristics as the reflector 201 and a light detection unit 904 is disposed to face the light source 202. About the same optical characteristics, it is the same as that of the second embodiment. The light detection unit 904 includes a plurality of light detectors 901, 902, and 903 arranged on the optical axis 107. Each photodetector includes a plurality of photodetectors arranged in a plane perpendicular to the optical axis 107.

The light detector 9 is located at the maximum light intensity position corresponding to the designed position of the lamp 101 with respect to the reflector 201.
04 in the direction of the optical axis 107, that is, the photodetector 90.
2 are arranged. For example, the reflecting surface of the reflector 201 is formed by an elliptical mirror, and the lamp 101 is
01, the lamp 101
The light beam emitted from the reflector 201 is focused on the second focal point of the reflector 201. Therefore, the position of a distance twice the focal length of the refractive optical system 203 from the front principal point position of the refractive optical system 203 is overlapped with the second focal point of the reflector 201.
By disposing 03, the light beam from the lamp 101 is focused again at the same magnification position of the refractive optical system 203. If the photodetector 902 is arranged at this position, the photodetector 90 is positioned at the maximum light intensity position.
2 will be arranged.

When the reflecting surface of the reflector 201 is formed by a parabolic mirror and the lamp 101 is arranged at the focal point of the reflector 201, the light beam emitted from the lamp 101 is emitted from the reflector 201 as a parallel light beam. Therefore, if the refracting optical system 203 is arranged on the same optical axis 107, the collimated light beam incident on the refracting optical system 203 is condensed from the lamp 101 at the focal position of the refracting optical system 203. If the photodetector 902 is arranged at this position, the photodetector 902 will be arranged at the maximum light intensity position.

With such a configuration, when the position of the lamp 101 with respect to the reflector 201 deviates from the optimum position, a change in the deviation of the maximum light intensity position formed by the refractive optical system 203 is detected by a plurality of photodetectors. Since the output can be confirmed by observing and comparing, the error in the position of the lamp can be confirmed accurately and easily.

Further, since the light detecting section 904 is composed of a plurality of light detectors and each light detector has a plurality of light detecting elements arranged in a plane perpendicular to the optical axis 107, the lamp 10
Even when the position of 1 is three-dimensionally shifted, the situation can be easily confirmed. FIG. 10 illustrates a case where the optical detector
An example of a state in which a plurality of photodetectors 1001 are arranged on a plane when viewed from the 07 direction is shown.

Further, when a reflector is used for the light source alignment detecting section, the light detecting section is disposed inside the reflector. When a refracting optical system is used, the light detecting section is disposed at a position distant from the refracting optical system. Therefore, a degree of freedom is obtained in the configuration, and the operability can be improved. (Embodiment 6) FIG. 11 is a layout view schematically showing a light source alignment adjusting device having a configuration in which a three-dimensional driving device 1101 is added to the light source alignment detecting optical device of the first embodiment. The light source 103 and the light source alignment detection unit 106
The description is omitted because it is the same as that of the first embodiment.

The lamp 1 is driven by the three-dimensional driving device 1101.
01 can be moved three-dimensionally with respect to the optical axis 107. By adjusting the position of the lamp 101 by the three-dimensional driving device 1101 so that the signal output from the detection unit 105 is maximized, the optimum position of the lamp 101 and the first reflector 102 can be determined.

In the present embodiment, the case where the three-dimensional driving device is used for driving the lamp according to the first embodiment has been described. However, the three-dimensional driving device may be used for the lamp according to the second to fifth embodiments. (Embodiment 7) FIG. 12 is a schematic configuration diagram of an illumination optical device using a light source 1201 in which alignment of a lamp and a reflector is optimized by a light source alignment adjusting device of the present invention. The light source is disposed inside a housing 1202 of the illumination optical device, and a light beam from the lamp is emitted from an opening of the housing. An infrared reflection filter, a color temperature conversion filter, or the like can be provided in the opening. Since the alignment between the lamp and the reflector is optimized by the light source alignment adjustment device, illumination with good symmetry can be performed in the illumination target area. (Eighth Embodiment) FIG. 13 is a schematic configuration diagram of a liquid crystal projector 1303 using a light source 1201 in which alignment of a lamp and a reflector is optimized by a light source alignment adjusting device of the present invention. The light flux from the light source 1201 undergoes light intensity modulation by a liquid crystal panel 1301 that forms video information by changing the transmittance according to an image signal, and is enlarged and projected on a screen 1304 by a projection lens 1302.

Since the alignment of the lamp and the reflector is optimized by the light source alignment adjusting device, the light source illuminates the liquid crystal panel 1301 well and distributes the luminance of the image projected on the screen 1304 well. Is possible.

[0075]

As described above, according to the first light source alignment detecting optical device of the present invention, the reflecting surface of the reflector for the lamp and the reflecting surface of the reflector for the light detecting portion are opposed to each other. When the position of the lamp deviates from the optimum position, the amount of light incident on the photodetector decreases, so that an error in the position of the lamp can be easily confirmed.

Next, according to the second light source alignment detecting optical device of the present invention, since the reflecting surface of the lamp reflector and the refractive optical system face each other, the position of the lamp deviates from the optimum position. In this case, since the light beam incident on the light detecting unit is reduced, an error in the position of the lamp can be easily confirmed. Further, since the light detection unit can be arranged at a position distant from the refractive optical system, a degree of freedom is obtained in the configuration and operability is improved.

Next, the light source alignment adjusting device of the present invention is provided with a three-dimensional driving device capable of adjusting the position of the lamp three-dimensionally with respect to the optical axis. The position of the lamp can be adjusted, and a light source with good illuminance distribution can be obtained.

Next, the illumination optical device of the present invention is provided with the light source whose alignment has been adjusted using the light source alignment adjusting device of the present invention, so that illumination with good symmetry can be performed in the illuminated area. .

[Brief description of the drawings]

FIG. 1 is a layout view schematically showing a configuration of a light source alignment detecting optical device according to a first embodiment of the present invention.

FIG. 2 is a layout view schematically showing a configuration of a light source alignment detecting optical device according to a second embodiment of the present invention.

FIG. 3 is a layout view schematically showing a configuration of a light source alignment detecting optical device according to a third embodiment of the present invention.

FIG. 4 is a layout diagram schematically showing a configuration using a refractive optical system in a light source alignment detection unit according to a third embodiment of the present invention.

FIG. 5 is a layout view schematically showing a configuration of a light source alignment detecting optical device according to a fourth embodiment of the present invention.

FIG. 6 is a layout diagram schematically showing a configuration using a refractive optical system in a light source alignment detection unit according to a fourth embodiment of the present invention.

FIG. 7 is a layout view schematically showing a configuration of a light source alignment detecting optical device according to a fifth embodiment of the present invention.

FIG. 8 is a plan view of a photodetector according to a fifth embodiment of the present invention.

FIG. 9 is a layout view schematically showing a configuration using a refractive optical system in a light source alignment detection unit according to a fifth embodiment of the present invention.

FIG. 10 is a plan view of a photodetector when a refractive optical system is used in a light source alignment detection unit according to a fifth embodiment of the present invention.

FIG. 11 is a layout view schematically showing a configuration of a light source alignment adjusting device according to a sixth embodiment of the present invention.

FIG. 12 is a schematic configuration diagram of an illumination optical device according to a seventh embodiment of the present invention.

FIG. 13 is a schematic configuration diagram of a liquid crystal projector device according to Embodiment 8 of the present invention.

[Explanation of symbols]

Reference Signs List 101 lamp 102 first reflector 103, 202, 1201 light source 104 second reflector 105, 502, 602, 704, 904 light detection unit 106, 204, 305, 405, 503, 603 light source alignment detection unit 107 optical axis 201 reflector 203 refractive optical system 301, 302, 303, 401, 402, 403, 7
01, 702, 703901, 902, 903 Photodetector 801, 1001 Photodetector 1101 Three-dimensional driving device 1202 Housing 1301 Liquid crystal panel 1302 Projection lens 1304 Screen

Claims (17)

[Claims] 1. A light source including a lamp and a first reflector, a second reflector having the same shape as the first reflector, and a light detector disposed on a reflection surface side of the second reflector. Wherein the light detection unit and the second reflector are arranged on an optical axis of the lamp, and a reflection surface of the first reflector and a reflection surface of the second reflector face each other. Light source alignment detecting optical device. 2. A light source including a lamp and a reflector, a refraction optical system having substantially the same optical characteristics as the reflector, and a light detection unit, wherein the light detection unit and the refraction optical system are arranged on an optical axis of the lamp. Wherein the reflection surface of the reflector and the refractive optical system face each other. 3. The light source alignment detecting optical device according to claim 1, wherein the light detecting section includes a plurality of light detectors on the same optical axis. 4. The photodetector includes a plurality of photodetectors in which a plurality of photodetectors are disposed in a plane perpendicular to an optical axis, and each of the photodetectors is disposed on the optical axis. Item 3. The light source alignment detecting optical device according to item 1 or 2. 5. The reflection surfaces of the first reflector and the second reflector are formed by elliptical mirrors, and the lamp is disposed at a first focal position of the first reflector, and The light source according to claim 1, wherein a second focal position and a second focal position of the second reflector are arranged at a position where the second focal position overlaps, and the light detection unit is arranged at a first focal position of the second reflector. Alignment detection optical device. 6. The photodetector includes a plurality of photodetectors on the same optical axis, and the position of the photodetector substantially at the center of the photodetector in the optical axis direction is the second reflector. The light source alignment detecting optical device according to claim 5, wherein the light source alignment detecting optical device is located at a position overlapping the first focal position. 7. The reflecting surfaces of the first reflector and the second reflector are formed by parabolic mirrors, the lamp is arranged at a focal position of the first reflector, and an arrangement position of the light detection unit The light source alignment detecting optical device according to claim 1, wherein? Is a focal position of the second reflector. 8. The photodetector includes a plurality of photodetectors on the same optical axis, and the position of the photodetector substantially at the center in the optical axis direction of the photodetector is the second reflector. The light source alignment detecting optical device according to claim 7, wherein the focal position is: 9. A reflecting surface of the reflector is formed by an ellipsoidal mirror, the lamp is disposed at a first focal point of the reflector, and a position of the refractive optical system is a position of a second focal point of the reflector; The position where the distance of twice the focal length of the refractive optical system from the front principal point position of the optical system overlaps, and the arrangement position of the light detection unit is the same magnification position of the refractive optical system. 3. The light source alignment detecting optical device according to 2. 10. The photodetector includes a plurality of photodetectors on the same optical axis, and the position of the photodetector substantially at the center in the optical axis direction of the photodetector is determined by the position of the refractive optical system. The light source alignment detecting optical device according to claim 9, wherein the light source alignment detecting optical device is at an equal magnification position. 11. A reflection surface of the reflector is formed by a parabolic mirror, the lamp is arranged at a focal position of the reflector, and an arrangement position of the light detection unit is a focal position of the refractive optical system. Item 3. A light source alignment detecting optical device according to item 2. 12. The photodetector includes a plurality of photodetectors on the same optical axis, and the position of the photodetector substantially at the center of the photodetector in the optical axis direction is determined by the position of the refractive optical system. The light source alignment detecting optical device according to claim 11, wherein the light source alignment detecting device is a focal position. 13. The light source alignment detecting optical device according to claim 1, wherein the light detecting section is movable on an optical axis. 14. A light source alignment adjusting device including the light source alignment detecting optical device according to claim 1, wherein the position of the lamp can be adjusted three-dimensionally with respect to an optical axis. A light source alignment adjusting device including a driving device. 15. The light source alignment adjusting device according to claim 14, wherein the three-dimensional driving device is driven so that the signal output from the light detecting unit is maximized to adjust the position of the lamp. 16. An illumination optical apparatus comprising a light source whose alignment has been adjusted using the light source alignment adjusting apparatus according to claim 14. 17. A liquid crystal projector device having a light source whose alignment has been adjusted using the light source alignment adjusting device according to claim 14. Description: