WO2022062542A1

WO2022062542A1 - Light-emitting apparatus

Info

Publication number: WO2022062542A1
Application number: PCT/CN2021/103623
Authority: WO
Inventors: 陈国平
Original assignee: 广州光联电子科技有限公司
Priority date: 2020-09-28
Filing date: 2021-06-30
Publication date: 2022-03-31
Also published as: CN112161208A

Abstract

The present invention relates to the technical field of stage lights and provides a light-emitting apparatus, comprising an LED array comprising a plurality of LED unit modules, each LED unit module comprising at least one LED chip, and the light-emitting area of the LED unit module being substantially circular; a collimation lens array, used for performing collimation on the light rays emitted by the LED unit modules; and a condenser lens, used for focusing the light rays collimated by the collimation lens array onto a preset focal plane to form a substantially circular light spot. The present invention sets the light-emitting area of the LED unit modules to be substantially circular and forms a substantially circular and uniform light spot on the focal plane without homogenisation by opposite fly-eye lenses, greatly reducing costs and obtaining light spots with a better light emission effect; the present invention also increases the photoelectric efficiency, light emission efficiency, service life, and stability of the LED chips and the wafer utilisation rate of the LED chip manufacturing, and reduces the junction temperature and production costs of the LED chips.

Description

a light-emitting device

technical field

The present invention relates to the technical field of stage lights, and more particularly, to a lighting device.

Background technique

The light source used in traditional stage lighting is gas discharge bulb light source (commonly known as HID), which collects the light emitted by the light source through the reflector, and projects the light through the imaging lens, thereby realizing stage lighting or creating various stage effects. Under normal circumstances, lamps using this light source have high energy consumption, low luminous efficiency, and short product life, and the lamp bulb of the lamp is full of high-voltage metal halide, which has a certain risk factor.

In recent years, light-emitting diode (LED) light source has developed rapidly. It is a clean and energy-saving light source that is green and pollution-free, and has a long service life. With the continuous development of technology, the luminous flux generated by each watt of electric power is increasing year by year, and the process is becoming more and more mature, which has provided conditions for the large-scale promotion and application of LED.

However, because the LEDs used in the stage lighting industry are required to have high power, large luminous flux output, strong directionality, good uniformity, and the characteristics of their exit light spots are circular light spots, the existing technology used in the field of stage lights. The power light source system mostly adopts an array LED light source, and the LED chip of the LED light source is in the shape of a rectangle. As shown in Figure 1, the multi-beams emitted by the LED light source are collimated one by one into near-parallel light by the corresponding collimating lens array, and then uniformed by the opposing fly-eye lens, and then converged on the focal plane by the condenser lens A uniform spot with a certain irradiated area is formed.

Specifically, as shown in FIGS. 1 and 2 , the opposed fly-eye lens in the prior art includes a first fly-eye lens 301 and a second fly-eye lens 302 , and the first fly-eye lens and the second fly-eye lens are two identical fly-eye lenses The two fly-eye lens units have the same hexagonal arrangement shape, the same size and the same focal length. The light collimated by the collimating lens array is divided into several hexagonal areas in the shape of a fly-eye lens unit by the first fly-eye lens in the light-emitting direction, and then focused on the focal plane by the second fly-eye lens and the condenser lens. A hexagonal light spot in the form of a compound eye unit is formed on it, and the hexagonal light spot is shown in Figure 3; then, a circular aperture is set on the focal plane of the condenser lens, so as to obtain the circle required for the stage light shown in the figure. shape spot.

However, since this solution uses an LED chip with a rectangular effective light-emitting surface, the LED chip and its one-to-one corresponding collimating lens array form an axis-to-axis optical system, and the hexagonal compound eye unit is used to perform the optical system. On the basis of the integrated hexagonal light spot, a diaphragm is used to cut into a circular light spot, which results in low light utilization efficiency of the entire optical system, and the optical system is complex and expensive.

SUMMARY OF THE INVENTION

The present invention aims to overcome the above-mentioned defect of low light utilization efficiency in the prior art, and provides a light-emitting device for improving the light utilization efficiency and reducing the cost.

The technical solution adopted by the present invention is to provide a light-emitting device, including an LED array, including several LED unit modules, each LED unit module includes at least one LED chip, and the light-emitting area of the LED unit module is generally in the shape of a Circular; collimating lens array, including several collimating lenses, each collimating lens is aimed at an LED unit module and used for collimating the light emitted by the LED unit module; condenser lens, used for The light collimated by the collimating lens array is focused on a preset focal plane to form a substantially circular and uniform light spot.

In this solution, the light emitted by the LED array is collimated by the collimating lens array into a near-parallel beam, and multiple near-parallel beams are focused on the focal plane preset by the condenser lens through the condenser lens. The images of the LED array are formed on the plane and superimposed together to form a generally circular light spot, that is, the light spot formed at the focal plane is the superposition and accumulation of the images formed by the light-emitting surfaces of the light sources. Since the light-emitting surface of the LED chip is uniform and the entire light-emitting surface of the LED chip emits uniform light, the superposition of the mirror images of the plurality of LED chips on the focal plane of the condensing lens is a uniform light spot. The substantially circular shape means that the light-emitting area of the LED unit module is circular or approximately circular.

Compared with the prior art LED array using a rectangular chip, the opposite fly-eye lens is used to optically homogenize it to form a hexagonal light spot on the focal plane of the condensing lens; this solution combines the light-emitting area of the LED unit module It is set to be generally circular, and without using the opposite fly-eye lens to homogenize it, this solution forms a generally circular and uniform light spot on the focal plane, which is better than the prior art. Said that, in this solution, the opposite fly-eye lens is reduced to greatly reduce the cost, and a light spot with better luminous effect can be obtained.

Preferably, the light-emitting surface of the LED chip includes a non-light-emitting area and a light-emitting area, and the non-light-emitting area is distributed on the periphery of the light-emitting area of the LED chip; the LED unit module includes an LED chip, and the LED chip The light-emitting area is generally circular; or, the LED unit module includes more than two LED chips, and the light-emitting area of each LED chip is combined to form the light-emitting area of the LED unit module. In this solution, when the LED unit module has only one LED chip, the light-emitting area of the LED chip is the light-emitting area of the LED unit module, and the non-light-emitting area is distributed in the light-emitting area of the LED chip. The periphery of the area can make the light emitted by the light-emitting area of the LED chip more concentrated. Compared with the prior art in which the LED array is arranged in a nearly circular shape to obtain a nearly circular light spot, this solution is directly improved on the LED chip, and the light-emitting area of the LED chip is set to be substantially circular. The light spot formed on the focal plane of the condenser lens is closer to a circle or a circle.

In the case that the LED unit module has at least two LED chips, the light-emitting area of the LED unit module is formed by combining the light-emitting areas of each chip in the LED unit module. . Furthermore, the light-emitting areas of each LED chip are concentrated together, which is conducive to forming a uniform light spot, avoiding a large gap between the LED chip and the LED chip, and making the light emitted by the LED unit module in the focusing lens. The light spot formed on the focal plane of the focal plane appears as a black line. Not only that, the light-emitting area and the non-light-emitting area in the LED unit module can be distinguished, so that the non-light-emitting area has an adverse effect on the light-emitting effect of the light-emitting area.

Preferably, the LED unit module includes two LED chips, and the shape of the light-emitting area of each LED chip is generally semicircular; or, the LED unit module includes four LED chips, each LED chip has a The shape of the light emitting area is generally a fan shape with a central angle of 90 degrees.

Preferably, the area of the light-emitting region of the LED chip accounts for at least 70% of the area of the light-emitting surface of the LED chip. In this scheme, the higher the ratio of the area of the light-emitting area of the LED chip to the area of the light-emitting surface of the LED chip, the higher the utilization rate of the wafer of the LED chip. The parameter setting of this scheme can obtain a higher utilization of the wafer of the LED chip. rate, thereby improving the luminous efficiency of the LED chip.

Preferably, the light-emitting area of the LED unit module is located in the central area of the LED unit module, and the non-light-emitting area of the LED chip is evenly distributed on the periphery of the light-emitting area of the LED unit module. In this solution, the light-emitting areas of the LED chips can be concentrated. When there are multiple LED chips in the LED unit module, the LED chips in the LED unit module are grouped together, so that the light in the light-emitting area of the LED unit module can be more concentrated.

Preferably, the LED array is provided on the ceramic substrate, and the ceramic substrate is provided with a first electrode; the LED unit module is provided with a second electrode, and the second electrode is distributed on the LED chip. In the non-emitting area, the first electrode is electrically connected to the second electrode. The arrangement of this solution can avoid the influence of the second electrode on the light extraction effect of the light emitting area.

Preferably, the first electrodes are provided with two and symmetrically distributed on both sides of the LED unit module, and have a certain distance from the LED unit module; the LED unit module is generally square, so The second electrodes are distributed in the area where the four corners of the LED unit module are located; the second electrodes located on the same side of the LED unit module are connected to the same first electrode. This solution is arranged in this way, so that the driving current passing through the LED chip can be evenly distributed in the entire LED chip, so as to reduce the voltage drop of the current passing through the LED chip, thereby improving the photoelectric efficiency of the LED chip and reducing the junction temperature of the LED chip. At the same time, the luminous efficiency, lifespan and stability of the LED chip are improved, and even the wafer utilization rate of the entire LED chip manufacturing is improved, thereby reducing the production cost. The junction temperature refers to the temperature of the PN junction.

Preferably, the first electrode is provided with one, and is arranged on one side of the LED unit module, and has a certain distance from the LED unit module; the LED unit module is generally square, corresponding to the LED unit module. The first electrode and the second electrode are distributed in the non-light-emitting area on the same side of the LED unit module, and are all connected to the first electrode.

Preferably, the LED unit modules provided with one LED chip are arranged in the center of the LED array and/or evenly distributed in the edge area of the LED array, and the three adjacent LED unit modules provided with at least two LED chips are Equilateral triangle arrangement. In this solution, the three adjacent LED unit modules provided with at least two LED chips form an equilateral triangle, which can make the arrangement between the collimating lenses and the collimating lenses in the corresponding collimating lens array more compact. Reduce optical invariants to improve optical illuminance and luminous density of LED arrays.

Preferably, the collimating lens includes a first collimating lens and a second collimating lens sequentially arranged in the light-emitting direction of the LED array, and the first collimating lens and the second collimating lens are respectively connected with the The LED unit modules are in one-to-one correspondence, and the light emitted by the LED unit modules is collimated and emitted through the first collimating lens and the second collimating lens in sequence.

Compared with the prior art, the beneficial effects of the present invention are: the present invention is provided with an LED array, a collimating lens array, and a condensing lens, wherein the present invention sets the light-emitting area of the LED unit module to be substantially circular, And without using the opposite fly-eye lens to homogenize the light, a generally circular and uniform light spot is formed on the focal plane, which greatly reduces the cost and obtains a light spot with better luminous effect; The invention optimizes the LED chip and the LED unit module, improves the photoelectric efficiency, luminous efficiency, lifespan, stability, and wafer utilization rate of the LED chip manufacturing, and reduces the junction temperature and production cost of the LED chip.

Description of drawings

FIG. 1 is a structural diagram of a prior art light-emitting device.

FIG. 2 is a structural diagram of an opposed fly-eye lens in the prior art.

FIG. 3 is an effect diagram of a simulated light spot in the prior art.

FIG. 4 is a structural diagram of the light-emitting device of the present invention.

FIG. 5 is a structural diagram of the LED light source module 100 provided with one LED chip.

FIG. 6 is a structural diagram of the LED light source module 100 with two LED chips.

FIG. 7 is a structural diagram of the LED light source module 100 provided with four LED chips.

FIG. 8 is a schematic diagram of the arrangement of the LED light source module 100 and the first electrode 121 .

FIG. 9 is a schematic diagram of a second arrangement of the LED light source module 100 and the first electrode 121 .

FIG. 10 is a schematic diagram of a third arrangement of the LED light source module 100 and the first electrode 121 .

FIG. 11 is an arrangement diagram of the LED array of the present invention.

FIG. 12 is an effect diagram of a simulated light spot of the present invention.

Reference numerals: LED unit module 100 , non-light-emitting area 111 , light-emitting area 112 , ceramic substrate 120 , gold wire 122 , first electrode 121 , first collimating lens 201 , second collimating lens 202 , condenser lens 400 , focal plane 500.

detailed description

The accompanying drawings of the present invention are only used for exemplary illustration, and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, which do not represent the size of the actual product; for those skilled in the art, some well-known structures and their descriptions in the drawings may be omitted. understandable.

Example 1

As shown in FIG. 4 , this embodiment provides a light-emitting device including an LED array, a collimating lens array, and a condensing lens 400 .

In order to facilitate understanding of the light-emitting device provided in Embodiment 1, the application process of the light-emitting device is first described below. The LED array is disposed on the ceramic substrate 120, and the ceramic substrate 120 is provided with a first electrode 121, and the LED array is provided with a second electrode, and the first electrode 121 and the second electrode are electrically connected , to power on the LED array. After the LED array is powered on, the LED array emits light, and the emitted light is collimated by the collimating lens array and then incident on the condensing lens 400 , and then focused and preliminarily focused by the condensing lens 400 . On the set focal plane 500, a substantially circular and uniform light spot is formed.

Wherein, as shown in FIG. 5 , FIG. 6 , and FIG. 7 , the LED array includes several LED unit modules 100 , each LED unit module 100 includes at least one LED chip, and the LED unit module 100 emits light. The area is generally circular. The substantially circular shape means that the light-emitting area of the LED unit module 100 is circular or approximately circular.

Specifically, the LED chip is generally rectangular, but not limited to a rectangular shape. The LED chip has a light-emitting surface, and the light-emitting surface includes a non-light-emitting area 111 and a light-emitting area 112 , and the non-light-emitting area 111 is distributed on the periphery of the light-emitting area 112 . In order to make the light of the LED unit module 100 more concentrated, the light-emitting area of the LED unit module 100 is located in the central area of the LED unit module 100, and the non-light-emitting area of the LED chip is evenly distributed on the LEDs The periphery of the chip light-emitting area 112 . Specifically, the area of the light-emitting region 112 of the LED chip accounts for at least 70% of the area of the light-emitting surface of the LED chip.

Specifically, the light-emitting area 112 of the LED chip is provided with a PN junction, and the PN junction is the basic principle for the LED chip to emit light. In detail, LED chips use light-emitting diodes, and the core part of light-emitting diodes is a wafer composed of P-type semiconductors and N-type semiconductors. There is a transition layer between the P-type semiconductors and the N-type semiconductors, called P-N junction. In the PN junction of some semiconductor materials, when the injected minority carriers and the majority carriers recombine, the excess energy will be released in the form of light, thereby directly converting electrical energy into light energy.

As shown in FIG. 5 , when the LED unit module 100 has only one LED chip, the light-emitting area of the LED chip is generally circular. That is to say, the light-emitting area 112 of the LED chip is the light-emitting area of the LED unit module 100 , and the light-emitting area 112 of the LED chip is arranged in the central area of the light-emitting surface of the LED chip. , the non-light-emitting area 111 of the LED chip is distributed on the periphery of the LED unit module 100 .

As shown in FIG. 6 and FIG. 7 , when the LED unit module 100 includes two or more LED chips, the light-emitting area 112 of each LED chip is combined to form the light-emitting area of the LED unit module 100 , and the The light-emitting area of the LED unit module 100 formed by the combination of the light-emitting areas 112 of the LED chips is generally circular and located in the central area of the LED unit module 100 , while the non-light-emitting areas 111 of the LED chips are evenly distributed in the LED unit The periphery of the light-emitting area of the module 100 . In this case, it can be understood that the light-emitting area of the LED unit module 100 is substantially circular: the light-emitting area of the LED unit module 100 is formed by splicing and combining the light-emitting areas 112 of two or more LED chips. A luminous area with a circular or nearly circular outline. In detail, the LED chips in the LED unit module 100 are closely arranged and tightly packaged with each other.

In a specific embodiment, as shown in FIG. 6 , the LED unit module 100 is provided with two LED chips, and the light-emitting area 112 of each LED chip is substantially semicircular. In detail, a part of the edge of the light-emitting area 112 of each LED chip can be flush with a part of the edge of the light-emitting surface of the LED chip, so that the light-emitting area 112 of the LED chip can occupy the light-emitting surface of the LED chip to the maximum extent area.

In a specific embodiment, as shown in FIG. 7 , the LED unit module 100 is provided with four LED chips, and the shape of the light-emitting area 112 of each LED chip is generally a fan shape with a central angle of 90 degrees. In detail, the same as the above, a part of the edge of the light-emitting area 112 of each LED chip can be flush with a part of the edge of the light-emitting surface of the LED chip, so that the light-emitting area 112 of the LED chip can be occupied to the maximum extent The area of the light-emitting surface of the LED chip.

As shown in FIG. 8 , FIG. 9 , and FIG. 10 , specifically, in order to realize the power-on of the LED array, a second electrode is provided in the non-light-emitting area 112 of the LED chip. The second electrode may be connected to the first electrode 121 disposed on the ceramic substrate 120 through gold wires 122 . The first electrodes 121 are provided corresponding to one LED unit module 100 , and the number of first electrodes 121 corresponding to one LED unit module 100 may be one or two, but not limited to one or two first electrodes 121 .

In a specific embodiment, as shown in FIG. 8 , the LED chips are square. One of the first electrodes 121 is disposed on one side of the LED unit module 100 and has a certain distance from the LED unit module 100 . Corresponding to the positions of the first electrodes 121 , a plurality of first electrodes 121 are distributed in the non-light-emitting area 111 on the same side of the LED unit module 100 , and three first electrodes 121 may be provided. In detail, the first electrodes 121 are respectively connected to the same first electrode 121 through gold wires 122 .

In a specific embodiment, as shown in FIG. 9 , the LED unit module 100 is provided with one LED chip, and the LED chip is square. There are two first electrodes 121 , which are symmetrically distributed on both sides of the LED unit module 100 and have a certain distance from the LED unit module 100 . In order to enable the driving current of the LED chip to be evenly distributed over the entire chip, which is beneficial to improve efficiency or improve the life and stability of the chip, the four corners of the LED unit module 100 are located in the non-light-emitting area 111 . The second electrodes are distributed in the areas where the four corners of the LED unit module 100 are located. In detail, the second electrodes located on the same side of the LED unit module 100 are connected to the same first electrode 121 .

In a specific embodiment, as shown in FIG. 10 , except that the LED unit module 100 is provided with at least two LED chips, other settings are substantially the same as those shown in FIG. 9 .

In a specific embodiment, the application of the LED array is that the LED array includes several LED unit modules 100 , each LED unit module 100 has an LED chip, and the light-emitting area of the LED chip is 112 mm in size. round.

In a specific embodiment, the application of the LED array is that the LED array includes several LED unit modules 100, each LED unit module 100 has at least two LED chips, and the light-emitting areas 112 of each LED chip are combined A light-emitting area of the LED unit module 100 is formed, and the light-emitting area of the LED unit module 100 is generally circular.

In a specific embodiment, the application of the LED array is that the LED array is approximately arranged in a hexagonal shape. The LED array includes several LED unit modules 100, some of the LED unit modules 100 have one LED chip, and some of the LED unit modules 100 include at least two LED chips. The LED unit module 100 with one LED chip can be mixed with the LED unit module with at least two LED chips. Specifically, as shown in FIG. 11 , the LED unit module 100 provided with one LED chip is provided with multiple LED units. There are multiple LED unit modules 100 provided with at least two LED chips, and the specific arrangement is as follows: the LED unit modules 100 provided with one LED chip are located in the center of the LED array and/or symmetrically and evenly distributed on the edge of the LED array Since the center of the LED array is the geometric center of the LED array, there may be one or more unit modules 100 with one LED chip located at the center of the LED array. In the LED array, the LED unit modules 100 provided with at least two LED chips adjacent to each other are arranged in an equilateral triangle to improve the luminous density of the LED array. The LED unit modules 100 of the LED chips are arranged in an equilateral triangle.

The collimating lens array includes several collimating lenses, and each collimating lens is aligned with one LED unit module 100 and used to collimate the light emitted by the LED unit module 100 . Specifically, the collimating lens includes a first collimating lens 201 and a second collimating lens 202 sequentially arranged in the light-emitting direction of the LED array. The first collimating lens 201 and the second collimating lens 202 respectively correspond to the LED unit modules 100 one-to-one, and the light emitted by the LED unit modules 100 is collimated and emitted sequentially through the first collimating lens 201 and the second collimating lens 202 . It can also be said that the first collimating lenses 201 are arranged in an array and correspond to the LED unit modules 100 in the LED array one-to-one, and the second collimating lenses 202 are also arranged in an array. and one-to-one correspondence with the LED unit modules 100 in the LED array. In detail, the second collimating lenses 202 are seamlessly spliced.

The condenser lens 400 is a lens with a positive focal length, and is used to focus the light collimated by the collimating lens array on a preset focal plane 500, as shown in FIG. Circular and uniform light spot. Specifically, a plurality of near-parallel light beams are focused on the focal plane 500 of the condenser lens 400 through the condenser lens 400 , and the images of the LED unit modules 100 are formed on the focal plane 500 and superimposed together to form a substantially circular shape. and uniform light spot.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principle of the claims of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

A light-emitting device, characterized in that it includes:

The LED array includes several LED unit modules (100), each LED unit module (100) includes at least one LED chip, and the light-emitting area of the LED unit module (100) is generally circular;

A collimating lens array, comprising a plurality of collimating lenses, each collimating lens is aligned with an LED unit module (100) and used for collimating the light emitted by the LED unit module (100);

A condenser lens (400) is used for focusing the light collimated by the collimating lens array on a preset focal plane (500) to form a substantially circular and uniform light spot.
The light-emitting device according to claim 1, wherein the light-emitting surface of the LED chip comprises a non-light-emitting area (111) and a light-emitting area (112), and the non-light-emitting area (111) is distributed on the LED the periphery of the chip light-emitting area (112); the LED unit module (100) includes an LED chip, and the LED chip light-emitting area (112) is substantially circular;

Or, the LED unit module (100) includes more than two LED chips, and the light-emitting area (112) of each LED chip is combined to form the light-emitting area of the LED unit module (100).
The light-emitting device according to claim 2, wherein the LED unit module (100) comprises two LED chips, and the shape of the light-emitting area of each LED chip is substantially semicircular;

Or, the LED unit module (100) includes four LED chips, and the shape of the light-emitting area of each LED chip is generally a fan shape with a central angle of 90 degrees.
The light-emitting device according to any one of claims 2 or 3, wherein the area of the LED chip light-emitting region (112) accounts for at least 70% of the area of the LED chip light-emitting surface.
The light-emitting device according to claim 1, wherein the light-emitting area of the LED unit module (100) is located in the central area of the LED unit module (100), and the non-light-emitting area of the LED chip is located in a central area of the LED unit module (100). (111) Evenly distributed on the periphery of the light-emitting area of the LED unit module (100).
The light-emitting device according to claim 5, wherein the LED array is arranged on the ceramic substrate (120), and the ceramic substrate (120) is provided with a first electrode (121); the LEDs The unit module is provided with a second electrode, and the second electrode is distributed in the non-light-emitting area of the LED chip, and the first electrode (121) is electrically connected to the second electrode.
The light-emitting device according to claim 6, wherein two first electrodes (121) are provided and symmetrically distributed on both sides of the LED unit module (100), and are connected with the LED unit There is a certain distance between the modules; the LED unit module (100) is generally square, and the second electrodes are distributed in the area where the four corners of the LED unit module (100) are located; 100) The second electrodes on the same side are connected to the same first electrode (121).
The light-emitting device according to claim 6, characterized in that one of the first electrodes (121) is provided, and is disposed on one side of the LED unit module (100), and is connected with the LED unit module. There is a certain distance between the groups (100); the LED unit modules (100) are generally square, corresponding to the first electrodes (121), and the second electrodes are distributed in the same LED unit module (100). The non-light-emitting area (111) on the side is connected to the first electrode (121).
The light-emitting device according to claim 1, characterized in that the LED unit module (100) provided with one LED chip is arranged in the center of the LED array and/or symmetrically and evenly distributed in the edge area of the LED array, adjacent to each other. The LED unit modules (100) provided with at least two LED chips are arranged in an equilateral triangle.
The light-emitting device according to claim 1, wherein the collimating lens comprises a first collimating lens (201) and a second collimating lens (202) sequentially arranged in the light-emitting direction of the LED array , the first collimating lens (201) and the second collimating lens (202) are in one-to-one correspondence with the LED unit modules (100), and the light rays emitted by the LED unit modules (100) are sequentially The output is collimated by the first collimating lens (201) and the second collimating lens (202).