JP2009302104A - Light projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light projector selectively using plural light sources and reduced in size. <P>SOLUTION: This invention relates to the light projector providing: each light source (11 to 14) in which emission members are dispersed and arranged on a virtual circle; a supporting body 10 which enables each emission member to support each light source movably on the virtual circle; first and second reflection mirrors 21, 22 which are arranged in a symmetrical form; a third reflection mirror 23 which is arranged in a position nearer to the supporting body 10 than each of the first and second reflection mirrors 21, 22; and a holding means 24 for holding an object 2 in a position facing the third reflection mirror 23, wherein a first optical path is set up extending over the first and third reflection mirrors 21, 23 and the holding means 24 from a predetermined outgoing point, and a second optical path is set up extending over the second and third reflection mirrors 22, 23 and the holding means 24 from the predetermined outgoing point. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a light irradiation device used for irradiating a predetermined position of a target object with laser light when performing measurement of characteristics of the target object such as a solar cell.

  As the urgency of solving problems related to the finiteness of the global environment and fossil energy increases year by year, expectations for environmentally friendly renewable energy are increasing further based on the principle of direct use of solar energy. Among them, the spread of photovoltaic power generation systems has accelerated at the annual rate of 10% mainly in Japan and Europe over the past 10 years. Due to this rapid spread rate, the limitation of the supply amount of crystalline silicon solar cells that directly convert solar energy into electrical energy has become apparent. For this reason, development of a thin film type solar cell is urgent in many universities and companies (see, for example, Patent Document 1).

  Based on the above background, as one of the work related to the development of solar cells, an apparatus (optical system) for irradiating the solar cells with laser light is necessary to evaluate various characteristics of the produced solar cells. It becomes. In order to widely spread such a device, it is desired to make the device compact. On the other hand, there is also a desire to be able to selectively use a plurality of light sources (for example, light sources having different laser light wavelengths) in order to support various characteristic measurements. Further, such a demand is not limited to the field of solar cells, but is common to apparatuses used for optical measurement.

JP 2002-063949 A

  Therefore, an object of the present invention is to provide a light irradiation apparatus that can selectively use a plurality of light sources and can be made compact.

  A light irradiation apparatus according to the present invention is a light irradiation apparatus used for irradiating a predetermined position of an object with laser light, and (a) each light emitting unit is distributed and arranged on the circumference of a virtual circle. A plurality of light sources, (b) a support that supports each of the light sources in a state in which each of the light emitting units is movable on a circumference of the virtual circle, and (c) a center of the virtual circle First and second reflecting mirrors that intersect with each other and are arranged symmetrically with respect to a virtual line parallel to the main optical axis of each of the plurality of light sources, and each tilted with respect to the virtual line; A third reflecting mirror disposed at a position intersecting the virtual line and closer to the support than each of the first reflecting mirror and the second reflecting mirror; 3 for holding the object at a position facing the reflecting mirror 3 It includes a stage, a. The first reflection mirror, the third reflection mirror, and the holding means from the first emission point set on the circumference of the imaginary circle and facing the first reflection mirror A first optical path is set across from the second exit point set on the circumference of the virtual circle and facing the second reflecting mirror, the second reflecting mirror, A second optical path is set across the third reflecting mirror and the holding means. Here, the said target object is a solar cell (solar cell), for example.

  According to the present invention, by rotating the support body clockwise or counterclockwise along the circumference of the virtual circle, the light emission point of each light source is set to either the first emission point or the second emission point. It is possible to irradiate the target with laser light emitted from the light source via the first reflection mirror or the second reflection mirror and the third reflection mirror. The rotation amount of the flat plate is ½ rotation at the maximum, but the rotation amount of the flat plate is reduced from ¼ rotation to 1/1 by optimizing the arrangement of each light source and the position setting of the first and second emission points. It is possible to make about 3 rotations. As a result, more light sources can be accommodated in a smaller space, and the rotation amount of the flat plate can be halved at the maximum, so it is easy to secure wiring to each light source. Therefore, it is possible to provide a light irradiation apparatus that can selectively use a plurality of light sources and can be made compact.

  The above-described support can be configured to be rotatable with the center of the virtual circle as a support point, for example. Thereby, the structure which supports the light emission part of each light source in the state which can move on the circumference of a virtual circle can be implement | achieved easily.

  Preferably, a driving means for rotating the support body around the support point is further provided. Thereby, operation becomes easy compared with the case where a support body is rotated by methods, such as manual operation.

  More preferably, the drive means controls the amount of rotation of the support so that at least one of the plurality of light sources is positioned at the first emission point or the second emission point. As a result, the rotational position of the support can be positioned with higher accuracy.

  The support described above can be realized using, for example, a flat plate. Space saving can be realized by using a flat plate. This effect becomes more remarkable by using a rectangular flat plate. Note that the support may be realized by a cylindrical member or the like.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  Drawing 1 is a mimetic diagram showing the composition of the light irradiation device of one embodiment. FIG. 2 is a front view of a light source holder which is a partial configuration of the light irradiation device. As shown in FIG. 1, the light irradiation device 1 of this embodiment includes a flat plate 10, light sources 11, 12, 13, 14, a flat plate support portion 15, a base 16, a rotation control portion 18, a laser driver (drive circuit) 19, The first reflection mirror 21, the second reflection mirror 22, the third reflection mirror 23, and a cell holder (holding means) 24 are included. This light irradiation device 1 is used for irradiating a predetermined position of a solar battery cell 2 as an object held by a cell holder 24 with laser light.

  The flat plate (support) 10 supports a plurality of light sources 11, 12, 13, and 14. Specifically, as shown in FIG. 2, the flat plate 10 is attached to the flat plate support portion 15 and is configured to be rotatable about the center m of the virtual circle C as a support point. Each light source 11, 12, 13, 14 is attached to the flat plate 10 so that each light emitting portion (indicated by a black dot in the figure) is located on the circumference of the virtual circle C as shown in FIG. 3. Yes. That is, the flat plate 10 supports the light sources 11, 12, 13, and 14 in a state in which each light source 11, 12, 13, and 14 is movable on the circumference of the virtual circle C. The flat plate 10 in this embodiment is substantially rectangular as shown in FIG. And each light source 11, 12, 13, 14 is each arrange | positioned at the four corners of the flat plate 10 on a rectangle.

  Each of the plurality of light sources 11, 12, 13, and 14 includes a light emitting element such as a semiconductor laser, for example, and outputs laser light having a predetermined wavelength. As described above, the light sources 11, 12, 13, and 14 are supported by the flat plate 10, and the respective light emitting units (indicated by black dots in FIG. 2) are distributed on the circumference of the virtual circle C. . Each of the light sources 11, 12, 13, and 14 outputs different laser beams from one surface side of the flat plate 10. For example, the light source 11 is a white light source, the light source 12 is a green light source, the light source 13 is a blue light source, and the light source 14 is a red light source.

  The flat plate support 15 supports the flat plate 10 described above so as to be rotatable about the center m of the virtual circle C as a support point. Further, the flat plate support portion 15 in this embodiment incorporates a driving force generating means such as a stepping motor, and controls the position of the flat plate 10 at a precise rotation angle based on the drive signal supplied from the rotation control portion 18. Is possible.

  The pedestal 16 is attached to the flat plate support 15 via a support column 17 (see FIG. 2), and the flat plate support 15 and the flat plate 10 are arranged at a predetermined position (height, etc.). A light source holder is configured including the pedestal 16, the support column 17, and the flat plate support portion 15.

  The rotation control unit 18 supplies a driving signal to the driving force generating means built in the flat plate support unit 15. In response to this drive signal, the flat plate 10 can be rotated at a desired rotation angle as shown in FIG.

  A laser driver (drive circuit) 19 is connected to each of the light sources 11, 12, 13, and 14 and supplies a drive signal to these light sources. Thereby, the output state of the laser beam of each light source is controlled.

  The first reflecting mirror 21 is spaced apart from the flat plate 10 and is disposed with its reflecting surface inclined 45 ° with respect to one surface of the flat plate 10. As shown in FIG. 1, the first reflection mirror 21 is installed so that the laser beam output from the light source 11 or the light source 12 can be reflected in the direction of the third reflection mirror 23. Details of the arrangement state of the first reflection mirror 21 will be described later.

  The second reflecting mirror 22 is spaced apart from the flat plate 10 and is disposed with its reflecting surface inclined 45 ° with respect to one surface of the flat plate 10. As shown in FIG. 1, the second reflection mirror 22 is installed so that the laser beam output from the light source 13 or the light source 14 can be reflected in the direction of the third reflection mirror 23. Details of the arrangement state of the second reflection mirror 22 will be described later.

  The third reflecting mirror 23 is arranged with a reflecting surface parallel to one surface of the flat plate 10 and in a direction not facing the one surface of the flat plate 10. As shown in FIG. 1, the third reflection mirror 23 is installed so that the laser light incident from the first reflection mirror 21 and the laser light incident from the second reflection mirror 22 can be reflected in the direction of the cell holder 24. Has been. Details of the arrangement state of the third reflection mirror 23 will be described later.

  The cell holder 24 is for holding the solar battery cell 2 as an object at a position facing the third reflecting mirror 23. The cell holder 24 is provided with a terminal configured to be in contact with the electrode of the solar battery cell 2. The cell holder 24 is provided with temperature detecting means (for example, a thermocouple) for measuring the back surface temperature of the solar battery cell 2. Further, the cell holder 24 may be provided with a temperature control means for keeping the temperature of the solar battery cell 2 constant.

  Next, the arrangement state of each reflecting mirror will be described in detail with reference to FIG. As described above, the flat plate 10 is configured to be rotatable about the center m of the imaginary circle, and the light sources 11, 12, 13, and 14 are attached to the flat plate 10. As shown in the figure, the first reflecting mirror 21 and the second reflecting mirror 22 intersect with the center m of the virtual circle and the main optical axes of the light sources 11, 12, 13, and 14 (dotted lines in the figure). Are arranged symmetrically with respect to an imaginary line E parallel to the display. In addition, each of the first reflection mirror 21 and the second reflection mirror 22 is disposed to be inclined by 45 ° with respect to the virtual line E. Further, the third reflection mirror 23 is disposed at a position intersecting the virtual line E and closer to the flat plate 10 than each of the first reflection mirror 21 and the second reflection mirror 22. The reflecting surface of the third reflecting mirror 23 is orthogonal to the imaginary line E and is directed to the side not facing one surface of the flat plate 10.

  Next, the arrangement of the light emitting units of each light source will be described in detail with reference to FIG. In FIG. 4, the light emitting portions of the light sources 11, 12, 13, and 14 are referred to as light emitting portions 11a, 12a, 13a, and 14a, respectively. These light emitting portions 11a to 14a are arranged so as to be movable on the circumference of the virtual circle C as shown in the figure. In addition, two laser light emission points are set on the circumference of the virtual circle C. The first emission point M1 and the second emission point M2. The first emission point M1 is set on the circumference of the virtual circle C and at a position facing the first reflection mirror 21 described above. The second emission point M2 is set on the circumference of the virtual circle C and at a position facing the second reflection mirror 22 described above. By appropriately rotating the flat plate 10, the light emitting part 11a of the light source 11 or the light emitting part 12a of the light source 12 can be selectively disposed at the first emission point M1. Similarly, by appropriately rotating the flat plate 10, the light emitting part 13a of the light source 13 or the light emitting part 14a of the light source 14 can be selectively disposed at the second emission point M2.

  In the present embodiment, a first emission point M1 and a second emission point M2 are set at each intersection of a straight line D passing through the center m of the virtual circle C and the virtual circle C as shown in the figure. The light emitting unit 11a and the light emitting unit 12a are arranged with an angle of 60 ° (= 30 ° + 30 °) across the first emission point M1. For example, as shown in the figure, the light emitting unit 11a is arranged 30 ° clockwise from the first emission point M1, and the light emitting unit 12a is arranged 30 ° counterclockwise from the first emission point M1, as shown in the initial state. . Thereby, the light emitting part 11a or the light emitting part 12a can be arranged at the first emission point M1 only by rotating the flat plate 10 counterclockwise or clockwise by 30 °. Similarly, the light emitting unit 13a and the light emitting unit 14a are arranged with an angle of 60 ° (= 30 ° + 30 °) across the second emission point M2. For example, as shown in the initial state, the light emitting portion 13a is arranged 30 ° counterclockwise from the second emission point M2, and the light emitting portion 14a is arranged 30 ° clockwise from the second emission point M2, as shown in the figure. . Thereby, the light emitting part 13a or the light emitting part 14a can be arranged at the first emission point M2 only by rotating the flat plate 10 by 30 ° clockwise or counterclockwise.

  As described above, the first emission point M <b> 1 is set at a position facing the first reflection mirror 21. For this reason, when the light emitting part 11a of the light source 11 is arranged at the first emission point M1 and laser light is output from the light source 11, the laser light is incident on the first reflection mirror 21 (FIG. 1 (see optical path L1 in FIG. 1), reflected in the direction of the third reflecting mirror 23 (see optical path L2 in FIG. 1), and further reflected in the direction of the cell holder 24 by the third reflecting mirror 23 (see optical path L3 in FIG. 1). ). Similarly, when the light emitting portion 12a of the light source 12 is arranged at the first emission point M1 and laser light is output from the light source 12, the laser light is incident on the first reflecting mirror 21 (see FIG. 1 (see optical path L1 in FIG. 1), reflected in the direction of the third reflecting mirror 23 (see optical path L2 in FIG. 1), and further reflected in the direction of the cell holder 24 by the third reflecting mirror 23 (see optical path L3 in FIG. 1). ). That is, in the light irradiation device 1 of the present embodiment, the first optical path is set from the first emission point M1 to the first reflection mirror 21, the third reflection mirror 23, and the cell holder 24.

  Further, as described above, the second emission point M2 is set at a position facing the second reflection mirror 22. Therefore, when the light emitting portion 13a of the light source 13 is arranged at the second emission point M2 and laser light is output from the light source 13, the laser light is incident on the second reflection mirror 22 (see FIG. 1 (see the optical path L4 in FIG. 1), reflected in the direction of the third reflecting mirror 23 (see the optical path L5 in FIG. 1), and further reflected in the direction of the cell holder 24 by the third reflecting mirror 23 (see the optical path L3 in FIG. 1). ). Similarly, when the light emitting portion 14a of the light source 14 is disposed at the second emission point M2 and laser light is output from the light source 14, the laser light is incident on the second reflecting mirror 22 (see FIG. 1 (see the optical path L4 in FIG. 1), reflected in the direction of the third reflecting mirror 23 (see the optical path L5 in FIG. 1), and further reflected in the direction of the cell holder 24 by the third reflecting mirror 23 (see the optical path L3 in FIG. 1). ). That is, in the light irradiation apparatus 1 of the present embodiment, the second optical path is set from the second emission point M2 to the second reflection mirror 22, the third reflection mirror 23, and the cell holder 24.

  According to the light irradiation device 1 of the present embodiment as described above, the light emitting point of each light source is set by rotating the flat plate (support) clockwise or counterclockwise along the circumference of the virtual circle. A solar cell that is arranged at either the first emission point or the second emission point, and the laser beam emitted from the light source is passed through the first reflection mirror or the second reflection mirror and the third reflection mirror. (Object) can be irradiated. Although the rotation amount of the flat plate is ½ rotation at the maximum, as exemplified in the above-described embodiment, by optimizing the arrangement of each light source and the position setting of the first emission point and the second emission point, It is possible to reduce the amount of rotation of the flat plate. Accordingly, it is possible to deal with more light sources in a small space, and the amount of rotation of the flat plate can be reduced, so that it is easy to secure wiring to each light source. Therefore, it is possible to provide a light irradiation apparatus that can selectively use a plurality of light sources and can be made compact.

  In addition, this invention is not limited to the content of embodiment mentioned above, In the range of the summary of this invention, it can change and implement variously.

  For example, in the above-described embodiment, the number of light sources attached to a flat plate as a support is four, but the present invention is applicable if the number of light sources is two or more, and the number of light sources is It is not limited to four. In the case of using many light sources, the effect of applying the present invention becomes more remarkable.

  In the embodiment described above, the light sources are arranged symmetrically at the four corners of the rectangular flat plate as the support. However, if the light emitting portions of the respective light sources are arranged on the circumference of the virtual circle, The arrangement may be asymmetric. Furthermore, in the above-described embodiment, the number of light sources associated with each of the first emission point and the second emission point is equal to two, but this is only an example and is associated with each emission point. The number of light sources may not be uniform.

  In the embodiment described above, a rectangular (rectangular) flat plate is shown as an example of the support, but the shape of the flat plate is not limited to this. A circular flat plate may be used, and a square flat plate may be used. Furthermore, the support body does not necessarily have to be realized by a flat plate as long as each light source can be supported so that each light emitting unit is located on the circumference of the virtual circle.

  In the embodiment described above, the rotation angle of the flat plate as the support is controlled by the rotation control unit. However, the rotation control unit may be omitted and the flat plate may be manually rotated.

  Moreover, in embodiment mentioned above, although the photovoltaic cell was mentioned as an example of the target object which irradiates light, a target object is not limited to this. The present invention can be generally applied to an apparatus for irradiating a laser beam and measuring a physical change caused by the laser beam.

It is a schematic diagram which shows the structure of the light irradiation apparatus of one Embodiment. It is a front view of the light source holder which is a partial structure of a light irradiation apparatus. It is a figure for demonstrating in detail the arrangement | positioning state of each reflection mirror. It is a figure for demonstrating in detail about arrangement | positioning of the light emission part of each light source.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Light irradiation apparatus 2 ... Solar cell (target object)
DESCRIPTION OF SYMBOLS 10 ... Flat plate 11, 12, 13, 14 ... Light source 11a, 12a, 13a, 14a ... Light emission part 15 ... Flat plate support part 16 ... Base 17 ... Support | pillar 18 ... Rotation control part 19 ... Laser driver (drive circuit)
DESCRIPTION OF SYMBOLS 21 ... 1st reflection mirror 22 ... 2nd reflection mirror 23 ... 3rd reflection mirror 24 ... Cell holder (holding means)
C ... virtual circle m ... center of virtual circle E ... virtual line M1 ... first emission point M2 ... second emission point

Claims (7)

A light irradiation device used for irradiating a predetermined position of an object with laser light,
A plurality of light sources in which each light emitting unit is distributed and arranged on the circumference of a virtual circle;
A support that supports the plurality of light sources in a state in which each of the light emitting units is movable on a circumference of the virtual circle;
First and second crossing the center of the virtual circle and symmetrically arranged across a virtual line parallel to the main optical axis of each of the plurality of light sources, and each tilted with respect to the virtual line A reflective mirror,
A third reflecting mirror disposed at a position intersecting the imaginary line and closer to the support than each of the first reflecting mirror and the second reflecting mirror;
Holding means for holding the object at a position facing the third reflecting mirror;
With
From the first emission point set on the circumference of the virtual circle and facing the first reflection mirror, the first reflection mirror, the third reflection mirror, and the holding means are crossed. To set the first optical path,
From the second emission point set on the circumference of the imaginary circle and facing the second reflection mirror to the second reflection mirror, the third reflection mirror, and the holding means. The second optical path is set,
Light irradiation device. The support is configured to be rotatable about the center of the virtual circle as a support point.
The light irradiation apparatus according to claim 1. Drive means for rotating the support around the support point;
The light irradiation apparatus according to claim 2. The drive means controls the amount of rotation of the support so that at least one of the plurality of light sources is positioned at the first emission point or the second emission point.
The light irradiation apparatus according to claim 3. The support is a flat plate;
The light irradiation apparatus of any one of Claims 1 thru | or 4. The flat plate is rectangular,
The light irradiation apparatus according to claim 5.   The light irradiation apparatus according to claim 1, wherein the object is a solar battery.

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