KR20140127731A - Solar simulator - Google Patents

Abstract

Provided is a solar simulator capable of greatly reducing the unevenness of a position in an inspected object with a simple composition and satisfying, for example, superlative standards. The solar simulator includes: a luminescent lamp (1) which is formed in a ring shape and has a work (W), which is an irradiation object, arranged in the penetration direction of the ring; and a ring shaped light shielding part (21) which is arranged between the luminescent lamp (1) and the work (W) and is formed with a wire material.

Description

Solar simulator {SOLAR SIMULATOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar simulator used for performance evaluation of a solar cell and other light resistance environment evaluation.

For example, in the performance evaluation of a solar cell, the positional unevenness of the irradiance of light irradiated to the surface of the solar cell to be irradiated is specified by JIS C8912 or IEC60904-9. More specifically, the position unevenness of the irradiance is defined based on the following expression.

[Equation 1]

Where E is the position unevenness (%) of the irradiance, E _max is the maximum value of the irradiance (W / m 2), and E _min is the minimum value of the irradiance (W / m 2). In Class A in the above-mentioned standard, it is required that the position unevenness can be suppressed within 2%.

As the luminescent lamp used in the solar simulator, for example, a long arc xenon lamp in which a single arc tube is twisted to form a ring shape can be given. When the ring-shaped emission lamp is pulsed, it is difficult to suppress the position unevenness at each point on the surface of the solar cell to be within 2%. In addition, the problem of the position unevenness is a problem not only in the evaluation of the solar cell but also in the performance evaluation of the solar cell panel in which a plurality of solar cells are combined.

Thus, in the solar simulator shown in Patent Document 1, a filter unit is provided as a position non-uniformity correction mechanism between a light output port of a lamp house in which a luminescent lamp is accommodated and a solar cell panel to be irradiated. The filter unit forms a plurality of rectangular areas on the optical path of the light emitted from the light output port and is provided with a mesh filter or a light shielding filter in a region corresponding to a part having high irradiance in the solar cell panel It is installed.

However, although it is theoretically possible to construct such a filter portion, it is considerably time-consuming to install a mesh filter in a region corresponding to a portion having a high radiation intensity in a solar cell panel. For example, when the light emitting state of the light emitting lamp changes due to aging or the like, it is difficult to correct the newly generated position unevenness by changing the position of the mesh filter corresponding thereto.

In addition, even if the filter unit is used as described above, it is difficult to reduce the level of position unevenness allowed in the A grade, which is determined by the standard.

(Patent Document 1) Japanese Laid-Open Patent Publication No. 2007-311085

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is an object of the present invention to provide a solar simulator capable of significantly reducing positional irregularities in an object to be irradiated, do.

That is, the solar simulator of the present invention described in claim 1 has a ring-shaped light emitting lamp in which a work to be irradiated is arranged in the through-hole direction of the ring, And a ring-shaped light shielding body formed of a wire material.

Here, the " ring shape " means not only a ring formed as a complete ring without being cut off from the middle, but also a shape in which a straight line is twisted to form a ring, or a shape in which a constituent member is partially separated It is a concept that includes what is being achieved.

In this case, since the light emitting lamp is formed in a ring shape, the light emitted from each point of the light emitting lamp is irradiated to the work to be irradiated while spreading at a predetermined solid angle. Therefore, when there is no light shielding material between the luminescent lamp and the work, a light-curing region in which light emitted from each point is superimposed on the intersection with the center axis of the luminescent lamp is overlapped on the work And the irradiance of the photopolymerization zone is slightly higher than that of the other portions.

In the present invention, since an annular light shielding member formed of a wire is disposed between the light emitting lamp and the work, a part of the light emitted from the light emitting lamp, which is to reach the light polymerization region, is shielded, The radiation intensity in the photopolymerization zone can be lowered slightly. Further, since the ring-shaped shielding body is formed of a wire material, it shadows only a part of the light and hardly shields the light emitted from the light emitting lamp and reaching the other area except the light-cured area.

Therefore, by the ring-shaped shielding body, it is possible to reduce the difference between the irradiance of the photopolymerizable region on the work and the irradiance of the other regions, thereby reducing the unevenness of the position on the workpiece .

Further, since the ring-shaped light shielding body has a very simple structure, it is easy to appropriately change the installation position and its size in accordance with the change of the irradiation state of the light emission lamp, and the adjustment work for reducing the position unevenness can be made very simple.

In order to reduce the radiation intensity in the photopolymerization zone by the ring-shaped light shielding member and appropriately reduce the positional irregularity on the workpiece, it is preferable that the light emission lamp and the ring- And the outer dimensions of the ring-shaped light shielding body are formed so as to be smaller than the outer dimensions of the light emitting lamp.

In order to form the ring-shaped light shielding body between the light emitting lamp and the work with a simple structure, it is preferable that the light emitting lamp is housed at one end inside and the lamp And the ring shaped light shielding body may be formed so as to intersect a plurality of wire rods provided so as to spread the light emission exit when the light emission exit is viewed in the direction in which the light emission lamp is disposed.

As a ring-shaped light shielding body, it is possible to obtain a light shielding effect for only the light-cured region, and to greatly reduce the positional unevenness on the workpiece, as in the invention according to claim 4, The body is formed into a substantially square shape by intersecting four wire rods.

In order to appropriately change the size of the ring light shielding body and to adjust the light shielding shape in accordance with the characteristics and the aging of the light emitting lamp so as to always reduce the unevenness of position on the work, May be configured so as to be capable of changing the position with respect to the light exit.

As described above, according to the solar simulator of the present invention, since the ring-shaped light shielding body formed of a wire material is disposed between the light emitting lamp and the work formed in a ring shape, It is possible to shade the light that would have reached the light-curing region, which is to be irradiated with light, to be shielded by the ring-shaped light shield, and to reduce the irradiance of only the region where the radiation illuminance tends to be high, and to significantly reduce the position unevenness on the work. In addition, since the ring-shaped shielding body is a very simple structure, the shape, position and size of the ring-shaped shielding body can be easily adjusted when positional unevenness is reduced.

1 is a schematic perspective view showing a solar cell evaluation apparatus using a solar simulator according to a first embodiment of the present invention;
2 is a schematic perspective view showing an internal structure and a radiation pattern of a solar simulator according to the first embodiment;
3 is a schematic vertical cross-sectional view of a solar simulator according to the first embodiment.
4 is a schematic diagram showing a structure of a position unevenness correction mechanism of a solar simulator according to the first embodiment;
5 is a measurement result showing a difference in positional irregularity between a conventional solar simulator and a solar simulator according to the present invention.
6 is a schematic diagram showing a position unevenness correcting mechanism of a solar simulator according to a second embodiment of the present invention.

The solar simulator 100 according to the first embodiment of the present invention and the solar cell evaluation apparatus 200 using the solar simulator 100 will be described with reference to Figs.

The solar cell evaluation apparatus 200 of the first embodiment shown in Fig. 1 evaluates the output characteristics of the solar cell W in the manufactured stage, for example, It is used to classify.

1, the solar cell evaluating apparatus 200 includes a solar cell simulator 100 having an approximately rectangular parallelepiped shape for irradiating a solar cell W to be irradiated with pulse light with a pulse light as shown in Fig. 1, A sample stage S disposed at a lower portion of the photovoltaic cell W on which the photovoltaic cell W is placed and a voltage value and a current value output from the photovoltaic cell W are measured and the IV characteristic thereof is measured and evaluated IV tester TS and a lighting power source P for controlling the light emission timing and light emission time of the solar simulator 100. The sample stage S and the IV tester TS are placed in a rack RA to be placed thereon. The top surface of the rack RA to be laid is opened, and at the second stage, (S), and the IV tester (TS) is housed in the first stage.

Next, the details of the solar simulator 100 of the present invention will be described.

2 and 3, the solar simulator 100 includes a rectangular parallelopiped lamp house 3, a light emitting lamp 1 accommodated in the lamp house 3, And a position nonuniformity correcting mechanism 2 for correcting the position unevenness on the solar cell W irradiated by the position nonuniformity correcting mechanism 2. [

The lamp house 3 has the light emitting lamp 1 housed at one opened end side and the other end opened at the light outlet 1 31, ). The position heterogeneity correcting mechanism 2 is disposed on the side of the light output port 31 in the lamp house 3 so as to be disposed between the light emission lamp 1 and the solar cell W .

The luminescent lamp 1 is a long arc xenon lamp formed in a substantially ring shape and its pulse light emission is controlled by the lighting power source P. Here, as will be described in more detail with respect to the shape of the luminescent lamp 1, as seen from the perspective view of Fig. 2, this is not a complete ring shape but is formed into a ring shape by twisting a central portion of the arc tube have. In the present specification, the ring shape is a concept including not only a complete ring shape but also a ring shape in which ends are not completely joined by crossing as shown in this embodiment.

The light emitting lamp 1 has a structure in which the solar cell W is arranged in the through direction of the ring and the surface on which the light is irradiated in the solar cell W is substantially parallel Respectively. 2, three regions are formed in the irradiation region A formed on the imaginary plane in which the solar cell W is located, because the light-emitting lamp 1 is formed in a ring shape . Specifically, a substantially circular photopolymerizable area R1 (R1) formed at the central portion of the surface of the solar cell W, centering on the intersection of the center axis C of the luminescent lamp 1 and the photovoltaic cell W, , An outer peripheral region R2 formed on the photovoltaic cell W outside the photopolymerizable region R1 and having a lower irradiance compared with the photopolymerizable region R1 and an outer peripheral region R2 , An unused region R3 formed outside the solar cell W and not used for characteristic evaluation is formed. Since light is emitted from each point of the ring-shaped light-emitting lamp 1 at a predetermined solid angle, the light emitted from substantially all the points of the light-emitting lamp 1 are overlapped with each other, And the radiation illuminance is an area where the radiation illuminance is likely to be higher than the outer circumferential area R2.

The position nonuniformity correcting mechanism 2 corrects the positional deviation of the photocurable region R1 and the outer circumferential region R2 on the surface of the solar cell W in order to evaluate the characteristics of the solar cell W, The difference in illuminance is reduced and the position unevenness is made within a predetermined allowable value. Here, the position unevenness is an amount defined based on, for example, the maximum irradiance and the minimum irradiance on the surface of the solar cell W, specifically defined by Equation 2.

&Quot; (2) "

Where E is the position unevenness (%) of the irradiance, E _max is the maximum value of the irradiance (W / m 2), and E _min is the minimum value of the irradiance (W / m 2).

On the other hand, in the first embodiment, it is aimed to satisfy the allowable value of the grade A in the standard by bringing the positional unevenness on the surface of the entire solar cell W within a deviation of 2% or less.

2 to 4, the position nonuniformity correcting mechanism 2 includes a ring shaped light shielding body 21 disposed between the light emitting lamp 1 and the solar cell W as four And is formed by the wire rods 2L.

The ring shaped light shielding body 21 is a square ring in the first embodiment and its center axis C is arranged so as to substantially coincide with the center axis C of the light emitting lamp 1 In addition, the external dimension thereof is smaller than that of the light-emitting lamp 1. In other words, the ring-shaped light shield 21 shields only a small part of the light emitted from the light emitting lamp 1 from traveling toward the photopolymerization zone R1.

4, the square shape of the ring-shaped light shield body 21 is formed so that the light output port 31 is formed in a direction in which the light output port 31 is viewed in the direction in which the light emission lamp 1 is disposed Are formed so as to intersect with the four wire rods 2L installed so as to overlap each other. In the first embodiment, two wire rods 2L are provided for two opposite sides of the square-shaped light emitting / ejecting port 31, and the two wire rods 2L cross each other at right angles so as to have a substantially square shape The ring-shaped light shielding body 21 is formed.

Each of the wire rods 2L is coated with a black paint on its surface, so that it is easy to absorb light. One end of each wire rod 2L is attached to the lamp house 3 by a spring 22 and one end thereof is held in a predetermined tension by the winding mechanism 23, And extends over the light exit port 31. Since the attachment position of the spring 22 is detachably attached to the lamp house 3 of the winding mechanism 23 and the attachment position is appropriately changed and the light output port 31 of the ring- ) Can be changed. In the first embodiment, the wire rod 2L is of wire or yarn-like thickness. However, the wire rod 2L may be appropriately changed in accordance with the irradiation pattern of the luminescent lamp 1 or the like. The upper limit of the specific thickness of the wire rod 2L is a diameter at least smaller than the tube diameter of the light emitting lamp 1.

A description will be given of the solar simulator 100 configured as described above on the basis of the measured results shown in Fig. 5, in which the position unevenness can be significantly reduced as compared with the conventional solar simulator 100. [ 5 (a) shows the distribution of the position unevenness on the solar cell W when the conventional solar simulator 100 is used, and Fig. 5 (b) shows the distribution of the position unevenness on the solar simulator 100 according to the first embodiment. Is used to indicate the distribution of the position variations on the solar cell (W). 5 (a) and 5 (b) show the results of dividing the surface of a solar cell W of the same size into 5 × 5 or 8 × 8 masses, measuring the irradiance of each mass, And the ratio of the deviation amount from the average irradiance to the illuminance. On the other hand, when the average irradiance is A, the deviation (e _max ) of the maximum irradiance based on the average irradiance and the deviation (e _min ) of the minimum irradiance based on the average irradiance, 3 can be displayed.

&Quot; (3) "

The magnitude relationship between the average irradiance A and the sum of the maximum irradiance E _max and the minimum irradiance E _{min in} Equation 3 is given by Equation 4 in the case where the absolute values of e _max and e _min are approximately equal, As shown in Fig.

&Quot; (4) "

Thus, the difference e _{max, min} e in equation (4) can be evaluated as shown in Equation 5 below.

&Quot; (5) "

That is, if the difference between e _max and e _min is evaluated, the position unevenness can be evaluated with a stricter criterion than the expression 2 of the position unevenness defined by the standard. In the following measurement examples, the position unevenness is evaluated based on the formula (5).

In the conventional example shown in Fig. 5 (a), the deviation of the maximum irradiation illuminance is 1.071% and the deviation of the minimum irradiation illuminance is -1.713% based on the average irradiation illuminance. That is, if the difference between the maximum irradiance and the minimum irradiance is subtracted, there is a deviation of more than 2%, and the position variation does not fall within the tolerance of the grade A.

As can be seen from the distribution of the position unevenness in Fig. 5 (a), this result is attributable to the fact that the irradiance is too high in the photopolymerization zone R1 at the center and the irradiance of the outer zone R2 is low .

On the other hand, in the case of the first embodiment shown in Fig. 5 (b), the deviation of the maximum irradiation illuminance is only 0.856% based on the average irradiation illuminance, and the deviation of the minimum irradiation illuminance is -0.985% There is only deviation. That is, if the difference between the maximum radial illuminance and the minimum radial illuminance is subtracted, there is no deviation of less than 2%, and the unevenness of the position can be brought within the tolerance of the class A.

It can be seen from the distribution of the irradiance distribution of FIG. 5 (b) that the radiation intensity of the photopolymerization zone R1 at the center is suppressed by the ring-shaped light shield 21. The ratio of the deviation of the radial roughness of the outer peripheral region R2 is smaller than that of the conventional one because the radiation intensity of the light-cured region R1 is reduced and the average radiation intensity is low, The radial roughness of the outer peripheral region R2 is not substantially reduced, and the deviation amount becomes relatively small. The radiation intensity of the photocurable region R1 can be suppressed only by the ring shading member 21 and the radiation intensity of the outer circumferential region R2 can be maintained substantially equal to the conventional one, It is possible to remarkably reduce the position irregularity on the entire surface.

Since the ring shaped light shielding body 21 of the first embodiment is formed so as to cross each of the four wire rods 2L, by properly changing the attachment position of the wire rod 2L, the ring shaped light shielding body 21 Can be simply changed. Therefore, even if the light emitting state of the light emitting lamp 1 changes due to aging or the like, it is possible to change the amount of light shielding and to reduce the position unevenness in accordance with the change.

Next, a second embodiment of the present invention will be described with reference to Fig. The members corresponding to the first embodiment are denoted by the same reference numerals.

In the first embodiment, the ring-shaped light shield 21 is formed as a substantially square ring intersecting the four wire rods 2L. However, the ring-shaped light shield 21 of the second embodiment is a ring- Shaped ring and the quadrant turning points of the circle are supported from the lamp house 3 by the wire members 2L, respectively.

In this case, since the light emitting lamp 1 and the ring-shaped light shielding body 21 have a more resemblance shape, light which would have reached the light-polymerizing region R1 in a more ideal form is shielded, Can be reduced.

Other embodiments will be described.

Although the luminescent lamp 1 uses the long arc xenon lamp in each of the embodiments, it may be a lamp based on other luminescence principle. That is, if the lamp is formed in a ring shape, the effects of the present invention can be obtained. The luminescent lamp 1 may be a ring-shaped luminescent lamp 1, which is formed in a ring shape without intersections and seams, as well as a ring-shaped luminescent lamp 1 by twisting and intersecting the luminous tubes as in the respective embodiments.

The shape of the ring-shaped light shield 21 is not limited to a square or a circle as shown in the embodiments, but may be a rectangle, a rhombus, a parallelogram, an ellipse, or a triangle. In other words, if the wire 2L is formed into a ring shape, its shape is not particularly limited. The center axis C of the light emitting lamp 1 and the center light axis 21 of the ring light shield 21 are not necessarily aligned with each other and may be offset from the center. Or may be disposed slightly inclined with respect to the base 1. The size, shape, and arrangement of the ring-shaped light shielding body 21 may be appropriately adjusted in accordance with the irradiation characteristics of the light emitting lamp 1. In the case of forming the ring-shaped light shielding body 21 by the plurality of wire rods 2L, it is sufficient that a ring is formed when viewed from the light output port 31, for example, and each wire rod 2L is contacted But may be disposed at a position of twist or the like. In this case, it is better to bring each wire 2L as close as possible.

Although the solar simulator 100 is used for evaluating the characteristics of the solar cell W in each of the above embodiments, the solar simulator 100 may be used for optical environment testing, for example. In addition to the solar cell W, A solar cell panel or the like may be used as an object of investigation.

In addition, various modifications and combinations of embodiments may be made without departing from the spirit of the present invention.

200 ... Solar cell evaluation device
100 ... Solar simulator
One … Luminescent lamp
21 ... The ring-
3 ... Lamp house
31 ... Photon outlet
W ... Solar cell (work)
C ... Center axis

Claims (5)

A luminescent lamp which is formed in a ring shape and in which a work to be irradiated is arranged in the through direction of the ring,
And a ring-shaped light shielding body disposed between the light emitting lamp and the work and formed of a wire material. The method according to claim 1,
The light-emitting lamp and the ring-shaped light shielding body are arranged so that their central axes are substantially aligned with each other,
Wherein the outer dimension of the ring-shaped shielding body is smaller than the outer dimension of the luminescent lamp. The method according to claim 1,
Further comprising a lamp house accommodating the light emitting lamp at one end thereof and having a light output port at the other end thereof,
Wherein the ring shaped light shielding body is formed so as to intersect a plurality of wire rods provided so as to extend the light emission exit when the light emission exit is viewed in a direction in which the light emission lamp is disposed. The method according to claim 1,
Wherein the ring shaped light shielding body has a substantially square shape crossing four wire rods. The method of claim 3,
And each wire member is configured to be capable of changing a position with respect to the light emission exit.

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