CN215764753U - Pulse solar simulator - Google Patents

Abstract

The utility model discloses a pulse solar simulator, which comprises an electric control module, a darkroom and a pulse light source; the darkroom is a closed cavity coated with a light absorption coating inside and is used for providing a light path and absorbing light rays outside the effective irradiation surface; the pulse light source is arranged at one end of the darkroom and is used as a light source for simulating sunlight, and the other end of the darkroom is used as a test surface of the solar cell module to be tested; the pulse light source comprises four pulse xenon lamp components which are identical in structure and symmetrically distributed, and each pulse xenon lamp component comprises a xenon lamp tube; a plurality of light blocking diaphragms are arranged in the darkroom; the electric control module comprises a pulse control module and a test control module, the pulse control module is used for controlling and monitoring the work of the pulse light source, and the test control module is used for collecting relevant data of the solar cell module to be tested so as to complete testing.

Description

Pulse solar simulator

Technical Field

The utility model relates to the field of optical instruments, in particular to a pulse solar simulator.

Background

The solar simulator is important equipment for testing the electrical performance of a solar cell module, and the existing solar simulator mainly adopts a xenon lamp as a light source of the simulator. The light-emitting spectrum of the xenon lamp is closer to the solar spectrum, and the spectral matching degree of the solar simulator of the high-precision xenon lamp light source and the solar spectrum can be within 2% through the solar simulator optical filter.

The existing sunlight simulator usually adopts two xenon lamps which are used as the light source of the sunlight simulator together; however, such a two-lamp solar simulator, whose test format is only 1.2 × 2.2 m at the maximum, has difficulty meeting the requirement of a larger irradiation area. In addition, the existing solar simulator usually adopts a current feedback scheme to collect the working current of the xenon lamp as feedback information, but the situation of simulated sunlight output of the xenon lamp can not be really reflected only by collecting the working current of the xenon lamp, so that the stability of the simulated sunlight output is poor. In addition, the existing pulse xenon lamp assembly may have the defects of unstable fixation of the xenon lamp tube, poor heat dissipation performance and the like, and the defects may even cause the shattered explosion of the xenon lamp tube.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a pulse solar simulator, which comprises an electric control module, a darkroom and a pulse light source;

the darkroom is a closed cavity coated with a light absorption coating inside and is used for providing a light path and absorbing light rays outside the effective irradiation surface;

the pulse light source is arranged at one end of the darkroom and is used as a light source for simulating sunlight, and the other end of the darkroom is used as a test surface of the solar cell module to be tested;

the pulse light source comprises four pulse xenon lamp components which are identical in structure and symmetrically distributed, and each pulse xenon lamp component comprises a xenon lamp tube;

a plurality of light blocking diaphragms are arranged in the darkroom;

the electric control module comprises a pulse control module and a test control module, the pulse control module is used for controlling and monitoring the work of the pulse light source, and the test control module is used for collecting relevant data of the solar cell module to be tested so as to complete testing.

In some embodiments, each pulsed xenon lamp assembly further comprises a standard solar cell disposed adjacent to the xenon lamp tube; the standard solar cell is used for collecting light intensity signals of the corresponding xenon lamp tubes and feeding the light intensity signals back to the pulse control module.

In some embodiments, the pulse control module comprises a main control module, a xenon lamp driving module, an energy storage module and a trigger module;

the main control module is respectively connected with the xenon lamp driving module, the energy storage module and the triggering module, and is used for receiving external interface signals, sending control instructions to other modules and collecting various signals generated by other modules;

the xenon lamp driving module comprises four xenon lamp driving sub-modules and four corresponding constant current control circuits, and each constant current control circuit is used for controlling the corresponding xenon lamp driving sub-module to output current to the corresponding xenon lamp tube according to a light intensity signal fed back by the standard solar cell piece and a reference signal provided by the main control module;

the energy storage module comprises four groups of super capacitor sets, the trigger module comprises four trigger units, and each trigger unit obtains electricity from the corresponding super capacitor set and is used for generating high-voltage pulse so as to light the corresponding xenon lamp tube.

In some embodiments, each pulse xenon lamp assembly further comprises a lamp shade, a reflector, an insulating plate and two lamp holders; the xenon lamp tube comprises a lamp shade, an insulation board, xenon lamp tubes, a pulse control module, a xenon lamp tube, a groove, a xenon lamp tube and a power supply, wherein the lamp shade is of a cuboid structure, a light outlet is formed in the top surface of the lamp shade, the insulation board is fixed on the bottom surface inside the lamp shade, two lamp holders are respectively fixed on two sides of the upper portion of the insulation board, two ends of the xenon lamp tube are respectively electrically connected with the two lamp holders, the two lamp holders are electrically connected with the pulse control module, the reflector is fixed in the middle of the upper portion of the insulation board, the groove is formed in the upper portion of the reflector, and the xenon lamp tube is installed in the groove of the reflector.

In some embodiments, each pulse xenon lamp assembly further comprises a reticle box, the reticle box is fixedly installed on one side surface inside the lampshade, a standard solar cell and a temperature sensor are installed in the reticle box, and the standard solar cell and the temperature sensor are electrically connected with external control equipment; the surface of the installation side of the title box is provided with a plurality of heat dissipation holes, the surface of the lampshade is provided with a heat dissipation port, and the position of the heat dissipation port corresponds to the position of the heat dissipation holes of the title box; the surface of one side of the slide box, which faces the inside of the lampshade, is provided with a light weakening sheet.

In some embodiments, each of the pulse xenon lamp assemblies further includes two heat dissipation fans, the two heat dissipation fans are respectively installed on two side surfaces inside the lamp shade, and a plurality of heat dissipation holes are respectively formed in the two side surfaces of the lamp shade, on which the heat dissipation fans are installed.

In some embodiments, each pulsed xenon lamp assembly further comprises a plurality of optical filters installed at the light exit of the lamp housing.

In some embodiments, the pulsed light source further comprises a housing, and a bottom plate, a light-transmitting glass and a diaphragm which are mounted on the housing, and all four pulsed xenon lamp assemblies are mounted inside the housing;

the bottom surfaces of the four pulse xenon lamp components are all arranged on the bottom plate, the four pulse xenon lamp components are symmetrically distributed, and the length direction of each pulse xenon lamp component is parallel to one side edge of the bottom plate;

printing opacity glass and diaphragm all install with one side that the bottom plate is relative, just the diaphragm is installed printing opacity glass's the outside, the diaphragm is used for promoting the homogeneity of light-emitting.

The utility model has the beneficial effects that: the pulse solar simulator provided by the utility model adopts a structure of four xenon lamp tubes, so that the irradiation area is greatly increased; the xenon lamp tube is stable to install and good in heat dissipation performance; and for each pulse xenon lamp component, a light feedback scheme is adopted through a standard solar cell, and a light intensity signal is acquired and fed back to the control equipment; therefore, the solar simulator can greatly improve the performances of the stability of irradiance, the irradiation intensity, the irradiation area and the like of the solar simulator, and can test the solar module cell with large width.

Drawings

FIG. 1 is a schematic external view of a pulsed solar simulator according to the present invention;

FIG. 2 is a schematic diagram of the operation of the pulsed solar simulator of FIG. 1;

FIGS. 3a and 3b are schematic views of a light blocking diaphragm;

FIG. 4 is a schematic external view of a pulsed xenon lamp assembly;

FIG. 5 is an exploded view of a pulsed xenon lamp assembly;

FIG. 6 is a schematic external view of a pulsed light source;

FIG. 7 is an exploded view of a pulsed light source;

fig. 8 is a schematic diagram of module connections of the pulse control module.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the utility model easy to understand, the following description further explains how the utility model is implemented by combining the attached drawings and the detailed implementation modes.

Referring to fig. 1 and 2, the present invention provides a pulsed solar simulator, which includes an electronic control module, a darkroom 20 and a pulsed light source 10; the darkroom 20 is a closed cavity coated with a light absorbing coating inside and is used for providing a light path and absorbing light rays outside the effective irradiation surface; the pulse light source 10 is arranged at one end of the darkroom 20 and is used as a light source for simulating sunlight, and the other end of the darkroom 20 is used as a test surface of the solar cell module to be tested; the pulse light source 10 comprises four pulse xenon lamp components which have the same structure and are symmetrically distributed, and each pulse xenon lamp component comprises a xenon lamp tube 2; a plurality of light blocking diaphragms 21 are also arranged in the darkroom 20; the electric control module comprises a pulse control module and a test control module, the pulse control module is used for controlling and monitoring the work of the pulse light source 10, and the test control module is used for collecting relevant data of the solar cell module to be tested so as to complete the test.

Referring to fig. 3a and 3b, two light blocking diaphragms 21 may be disposed inside the darkroom 20 for blocking light with a large angle, so that the light path inside the darkroom 20 is as shown in fig. 2, and finally, 2m × 3m light spots are formed on the test surface; the light absorption coating in the darkroom 20 is a black coating for absorbing 300 nm-1800 nm light, so that divergent light is prevented from being reflected to an irradiation surface through multiple paths, and interference is prevented.

As further shown in fig. 4 and 5, each pulse xenon lamp assembly comprises a lamp shade 1, a xenon lamp tube 2, a reflector 3, an insulating plate 4 and two lamp holders 5; the xenon lamp tube type LED lamp comprises a lamp shade 1, an insulating plate 4, a xenon lamp tube 3, a pulse control module, a reflector 3, a xenon lamp tube 2, a pulse control module, a power supply module, a pulse control module, a lamp base, a lamp tube and a lamp base, wherein the lamp shade 1 is of a cuboid structure, a light outlet is formed in the top surface of the lamp shade 1, the insulating plate 4 is fixed on the bottom surface inside the lamp shade 1, the two lamp bases 5 are respectively fixed on two sides above the insulating plate 4, two ends of the xenon lamp tube 2 are respectively electrically connected with the two lamp bases 5, the two lamp bases 5 are electrically connected with the pulse control module, the reflector 3 is fixed in the middle above the insulating plate 4, a groove is formed above the reflector 3, and the xenon lamp tube 2 is installed in the groove of the reflector 3; the insulating plate 4 can be made of a high-insulation, voltage-resistant and heat-resistant bakelite plate material to ensure safe operation.

The xenon lamp tube 2 can adopt a long-arc xenon lamp shown in the figure, and in a specific embodiment, the output light pulse of the xenon lamp tube 2 is normally 10ms and can reach 20ms at most; the average output optical power over a 10ms pulse time was 150000W. The xenon lamp tube 2 can emit light at 15S time intervals, and the normal service life can reach about 60000 times. The instantaneous injection current of the xenon lamp tube 2 reaches: 500-600A, voltage: 500V-800V.

Preferably, each pulse xenon lamp component further comprises a reticle box 6, the reticle box 6 is fixedly installed on one side surface inside the lampshade 1, a standard solar cell 16 and a temperature sensor are installed inside the reticle box 6, and the standard solar cell 16 and the temperature sensor are electrically connected with external control equipment; a plurality of heat dissipation holes are formed in the surface of the mounting side of the reticle box 6, a heat dissipation port is formed in the surface of the lampshade 1, and the position of the heat dissipation port corresponds to the position of the heat dissipation holes of the reticle box 6; the surface of the reticle pod 6 on the side facing the inside of the lamp housing 1 is provided with a light-weakening sheet 7.

The standard solar cell plate 16 in the reticle box 6 is used as an important feedback sensor for the constant light of the xenon lamp 2, and the purpose of the feedback sensor is to reduce the interference between different xenon lamps 2 and ensure the stability of the irradiance of the xenon lamp 2. However, since the standard solar cell 16 is close to the xenon lamp tube 2 and receives irradiance of several kilowatts per square meter, if it is directly exposed, the life span of the standard solar cell 16 is greatly reduced; therefore, the utility model arranges the weak light sheet 7 in front of the standard solar cell 16 for light reduction treatment, the weak light sheet 7 can select a neutral full-wave band attenuation filter adopting a metal evaporation process, and the passing rate is controlled to be about 10%; still set up temperature sensor in addition in the slide box 6 to realize temperature feedback, and dispel the heat through the louvre.

Preferably, each pulse xenon lamp component further comprises two heat dissipation fans 8, the two heat dissipation fans 8 are respectively installed on two side surfaces inside the lamp shade 1, and a plurality of heat dissipation holes are formed in the two side surfaces of the lamp shade 1, which are used for installing the heat dissipation fans 8. Through setting up two radiator fan 8 with carry out the forced air cooling heat dissipation, avoid xenon lamp 2 overheated.

Preferably, each pulse xenon lamp component further comprises a plurality of optical filters 9 arranged at the light outlet of the lampshade 1. The number of the optical filters 9 can be three as shown in the figure, and the three optical filters 9 are integrally installed at the light outlet of the lampshade 1 through one installation structure. And the filter 9 can be replaced by a screw structure.

As further shown in fig. 6 and 7, the pulse light source 10 further includes a housing 11, and a bottom plate 12, a transparent glass 13, and a diaphragm 14 mounted on the housing 11, wherein the four pulse xenon lamp assemblies are all mounted inside the housing 11; the bottom surfaces of the four pulse xenon lamp components are all arranged on the bottom plate 12, the four pulse xenon lamp components are symmetrically distributed, and the length direction of each pulse xenon lamp component is parallel to one side edge of the bottom plate 12; the transparent glass 13 and the diaphragm 14 are both arranged on one side opposite to the bottom plate 12, the diaphragm 14 is arranged on the outer side of the transparent glass 13, and the diaphragm 14 is used for improving the uniformity of light emission; the light-transmitting glasses 13 may be three in number as shown and are mounted in a frame structure at the end of the housing 11.

According to the sunlight simulator provided by the utility model, the pulse light source 10 adopts a four-xenon lamp design, so that the irradiation area can be increased to 2 x 3m, and the test requirement of an aerospace grade solar cell module can be met; irradiance is 1367W/m2, voltage is up to 200V, and current is up to 20A. Each pulse xenon lamp component can be independently controlled and adjusted, the control loops of each pulse xenon lamp component are the same, the complexity of the equipment is reduced, the working reliability of the equipment is guaranteed, and the working coordination among different pulse xenon lamp components is completed by the pulse control module.

It is understood that one central control machine and two capacitor cabinets are shown in fig. 1; the pulse control module and the test control module can share one main control platform, the main control platform can be composed of a central control machine and a collection card, is a core control part of the whole machine and mainly completes tasks of instruction sending, data processing, test display, data recording, interface control and the like so as to realize the control, data processing and result display functions of the whole equipment. The main hardware part of the pulse control module can be installed in a capacitor cabinet and is specifically used for finishing the functions of power supply boost conversion, energy storage control of an energy storage component, high-voltage triggering of a xenon lamp, pulse output control and the like. The main hardware part of the test control module can be installed in another capacitor cabinet and is specifically used for completing the light intensity irradiance and temperature detection and the volt-ampere characteristic test of the solar cell module to be tested.

Referring further to fig. 8, the pulse control module includes a main control module 100, a xenon lamp driving module 400, an energy storage module 200, and a trigger module 300.

Specifically, for the pulse control module, the voltage of the energy storage module, the drive current of the xenon lamp, the preparation and standby states and the like can be set in a 485 communication mode; meanwhile, an IO control interface is provided, and the pulse flash duration and the flash time sequence can be controlled through IO.

The main control module 100 is respectively connected to the xenon lamp driving module 400, the energy storage module 200 and the triggering module 300, and the main control module 100 is configured to receive an external interface signal, send a control instruction to each other module, and collect various signals generated by each other module. The main control module 100 is a main control platform shown in fig. 1, and is used as a control center, and is shared by the pulse control module and the test control module; a7-inch touch screen can be designed for parameter setting and state monitoring, and parameters such as real-time running state, current and voltage of the pulse solar simulator can be conveniently checked.

The xenon lamp driving module 400 comprises four xenon lamp driving submodules 401 and four corresponding constant current control circuits 402, wherein each constant current control circuit 402 is used for controlling the corresponding xenon lamp driving submodule 401 to output current to the corresponding xenon lamp tube 2 according to a light intensity signal fed back by the standard solar cell 16 and a reference signal provided by the main control module 100. The constant light intensity control of different pulse xenon lamp components is realized by light negative feedback control, namely, the stability of the output light intensity of the xenon lamp tube 2 is realized by sampling the light intensity output by the xenon lamp tube 2 as a feedback signal and controlling the working current of the xenon lamp tube 2. By sampling the light intensity signal output by the xenon lamp tube 2 and directly feeding back the light intensity signal to the constant current control circuit 402 at the source end in a negative feedback mode, the interference in the whole control loop is shielded, and thus the stability of the output light intensity of the xenon lamp tube 2 is accurately controlled.

The energy storage module 200 comprises four groups of super capacitor sets 201, the trigger module 300 comprises four trigger units 301, and each trigger unit 301 gets electricity from the corresponding super capacitor set 201 and is used for generating high-voltage pulse to light the corresponding xenon lamp tube 2.

The energy storage module 200 further includes a charging circuit and a discharging circuit, the charging circuit may include a boost circuit, the boost multiplying power may be set to be 2.5 times in consideration of the requirements of the working voltage and the trigger voltage of the xenon lamp 2, and the output peak voltage is 777V, so as to charge the super capacitor bank 201. Because the xenon lamp working voltage is high and the energy consumption is large, a plurality of super capacitors are connected in series and in parallel to form the super capacitor bank 201 to realize energy storage, the current of a charging loop is controlled by the capacitor charging in a PWM (pulse width modulation) mode, and meanwhile, a current transformer is arranged in the charging loop to monitor the charging current in real time so as to ensure the reliability of the capacitor charging and working. The super capacitor group 401 is divided into four groups, supplies power to the four xenon lamps 2, can be independently controlled to be turned on and turned off, and does not affect other xenon lamps when a single xenon lamp fails. The discharging loop is used for releasing the electricity of the super capacitor bank when the equipment is shut down and stops running so as to ensure safety, and the discharging modes of the discharging loop are 3 types: a. the control panel controls the IGBT to discharge; b. after the main power supply of the equipment is powered off, the NC contact is closed, and the capacitor is discharged; c. the positive and negative electrodes of the capacitor are connected with a fixed load of 100K/10W, so that the capacitor can be slowly discharged. Through the cooperation of the three discharging modes, when the static state of the device is ensured, the super capacitor bank 401 is in an uncharged state.

The trigger module 300 generates a high voltage pulse of about 25KV through the isolation coil, and is used for generating arc discharge for gas activation of the xenon lamp 2, thereby lighting the xenon lamp. The trigger module 300 takes power from the supercapacitor pack 401, the voltage of the power is about DC700V, and high voltage of about 25KV is generated through a high-voltage trigger. Therefore, the boosting multiple of the trigger coil needs to be controlled to be about 350 times, and other special triggers are not needed.

In addition, the test control module can comprise a microcontroller module, an electronic load module and a sensor module, after a test command of the main control platform is received, the microcontroller module controls the electronic load module to carry out volt-ampere characteristic curve scanning, a volt-ampere characteristic parameter of the solar cell module to be tested is obtained, irradiance data and temperature data are synchronously detected, and a test result is sent to the main control platform.

In conclusion, the pulse solar simulator provided by the utility model adopts a structure of four xenon lamp tubes, so that the irradiation area is greatly increased; the xenon lamp tube is stable to install and good in heat dissipation performance; and for each pulse xenon lamp component, a light feedback scheme is adopted through a standard solar cell, and a light intensity signal is acquired and fed back to the control equipment; therefore, the solar simulator can greatly improve the performances of the stability of irradiance, the irradiation intensity, the irradiation area and the like of the solar simulator, and can test the solar module cell with large width.

Finally, the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, which should be covered by the claims of the present invention.

Claims (8)

1. A pulse solar simulator is characterized by comprising an electric control module, a darkroom (20) and a pulse light source (10);

the darkroom (20) is a closed cavity coated with a light absorption coating inside and is used for providing a light path and absorbing light rays outside the effective irradiation surface;

the pulse light source (10) is arranged at one end of the darkroom (20) and is used as a light source for simulating sunlight, and the other end of the darkroom (20) is used as a test surface of the solar cell module to be tested;

the pulse light source (10) comprises four pulse xenon lamp components which are identical in structure and symmetrically distributed, and each pulse xenon lamp component comprises a xenon lamp tube (2);

a plurality of light blocking diaphragms (21) are arranged in the darkroom (20);

the electric control module comprises a pulse control module and a test control module, the pulse control module is used for controlling and monitoring the work of the pulse light source (10), and the test control module is used for collecting relevant data of the solar cell module to be tested so as to complete the test.

2. The pulsed solar simulator according to claim 1, characterized in that each pulsed xenon lamp assembly further comprises a standard solar cell (16) disposed beside the xenon lamp tube (2); the standard solar cell (16) is used for collecting light intensity signals of the corresponding xenon lamp tube (2) and feeding the light intensity signals back to the pulse control module.

3. The pulsed solar simulator according to claim 2, wherein the pulse control module comprises a main control module (100), a xenon lamp driving module (400), an energy storage module (200) and a trigger module (300);

the main control module (100) is respectively connected with the xenon lamp driving module (400), the energy storage module (200) and the trigger module (300), and the main control module (100) is used for receiving external interface signals, sending control instructions to other modules and collecting various signals generated by other modules;

the xenon lamp driving module (400) comprises four xenon lamp driving sub-modules (401) and four corresponding constant current control circuits (402), and each constant current control circuit (402) is used for controlling the corresponding xenon lamp driving sub-module (401) to output current to the corresponding xenon lamp tube (2) according to a light intensity signal fed back by the standard solar cell (16) and a reference signal provided by the main control module (100);

the energy storage module (200) comprises four groups of super capacitor sets (201), the trigger module (300) comprises four trigger units (301), and each trigger unit (301) gets electricity from the corresponding super capacitor set (201) and is used for generating high-voltage pulse to light the corresponding xenon lamp tube (2).

4. The pulsed solar simulator according to claim 2, wherein each pulsed xenon lamp assembly further comprises a lamp shade (1), a reflector (3), an insulating plate (4) and two lamp holders (5); the utility model discloses a xenon lamp, including lamp shade (1), lamp stand (5), insulation board (4), pulse control module, reflection body (3), lamp shade (1) is the cuboid structure, the light-emitting window has been seted up to the top surface of lamp shade (1), insulation board (4) are fixed on the bottom surface of lamp shade (1) inside, two lamp stand (5) are fixed respectively the top both sides of insulation board (4), xenon fluorescent tube (2) both ends are connected with two lamp stand (5) electricity respectively, and two lamp stand (5) are connected with pulse control module electricity, reflection body (3) are fixed the top middle part of insulation board (4), just the top of reflection body (3) is formed with the recess, xenon fluorescent tube (2) are installed in the recess of reflection body (3).

5. The pulsed solar simulator according to claim 4, wherein each pulsed xenon lamp assembly further comprises a reticle box (6), the reticle box (6) is fixedly installed on one side surface inside the lampshade (1), a standard solar cell (16) and a temperature sensor are installed in the reticle box (6), and the standard solar cell (16) and the temperature sensor are electrically connected with an external control device; the surface of the installation side of the reticle box (6) is provided with a plurality of heat dissipation holes, the surface of the lampshade (1) is provided with heat dissipation ports, and the positions of the heat dissipation ports correspond to the positions of the heat dissipation holes of the reticle box (6); the surface of one side of the label box (6) facing the inside of the lampshade (1) is provided with a weak light sheet (7).

6. The pulse solar simulator according to claim 4, wherein each pulse xenon lamp assembly further comprises two heat dissipation fans (8), the two heat dissipation fans (8) are respectively installed on two side surfaces inside the lampshade (1), and a plurality of heat dissipation holes are formed in the two side surfaces of the lampshade (1) for installing the heat dissipation fans (8).

7. A pulsed solar simulator according to claim 4, characterized in that each pulsed xenon lamp assembly further comprises a number of filters (9) mounted at the light exit of the lamp housing (1).

8. The pulsed solar simulator according to any one of claims 1 to 7, characterized in that the pulsed light source (10) further comprises a housing (11) and a bottom plate (12), a light-transmitting glass (13) and a diaphragm (14) mounted on the housing (11), wherein four pulsed xenon lamp assemblies are mounted inside the housing (11);

the bottom surfaces of the four pulse xenon lamp components are all arranged on the bottom plate (12), the four pulse xenon lamp components are symmetrically distributed, and the length direction of each pulse xenon lamp component is parallel to one side edge of the bottom plate (12);

printing opacity glass (13) and diaphragm (14) all install with bottom plate (12) relative one side, just diaphragm (14) are installed the outside of printing opacity glass (13), diaphragm (14) are used for promoting the homogeneity of light-emitting.

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