A laser projector light combining system optical path detection device and detection method thereof

Abstract

The present invention discloses a laser projector light combining system optical path detection device and detection method thereof, including a driving power supply, a detection screen and a laser projector light combining system to be tested, wherein the laser projector light combining system to be tested includes a laser generator, a wavelength conversion component and a preset optical path, a light combining lens is arranged in front of the light spot of the light combining system, and the light spot is emitted into the detection screen through the light combining lens; the driving power supply is used to set a DC regulated power supply with different voltages and currents for the laser projector light combining system to be tested; for different types of laser light sources, matching data for making the laser light emitter emit light stably is set, so that the detection can be carried out smoothly, and the laser projector light combining system is avoided from being damaged due to too strong light. Through this detection method, unqualified light combining systems can be quickly screened out without having to wait until the entire optical machine is assembled before detection. Through testing, guidance can be provided for the repair of defective products, thereby improving production efficiency.

Description

Technical Field

[0001] The present invention relates to the field of laser projection, and in particular to a light path detection device and a detection method for a light combining system of a laser projector. Background Art

[0002] Compared with projectors with other light source systems, laser projectors have the advantages of long life, high brightness and wide color gamut. Laser projectors usually include a laser light combining system and a lens imaging system. The laser light combining system has a wavelength conversion device and a preset optical path, which can convert the monochromatic blue laser into a three-color laser, which is converged by the light combining lens and projected into the optical fiber of the imaging system. The position and size of the light spot of the combined light are greatly affected by the errors of the components of the combined light system. If the light spot of the combined light cannot be completely received by the optical fiber, the brightness and color temperature of the projector will not reach the preset value.

[0003] Generally, only after the entire optical machine is fully assembled, will the optical brightness, color temperature and other data be tested. The position and size of the combined light spot are greatly affected by the error of the combined light system components. If the combined light spot cannot be completely received by the light guide, the brightness and color temperature of the projector will not reach the preset value. If the brightness and color temperature of the optical machine system are not up to standard, the machine needs to be disassembled for repair and debugging. This method is time-consuming and labor-intensive, with low efficiency, affecting production operations. There is a lack of an intuitive detection method to test whether the internal optical path of the combined light is consistent with the preset optical path, and to test the matching position relationship between the light spot and the light guide. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a light path detection device for a laser projector light combining system, which can not only effectively detect whether the internal light path of the light combining system is consistent with the preset light path, that is, the position of the light combining spot, and test the matching position relationship between the light emitting spot and the light guide, but also avoid disassembly for maintenance and debugging, thereby ensuring the normal progress of production operations and improving production efficiency.

[0005] Another object of the present invention is to provide a method for detecting the optical path of a laser projector optical system.

[0006] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is: a laser projector light combining system optical path detection device, including a driving power supply, a detection screen and a laser projector light combining system to be tested, characterized in that:

[0007] The light combining system of the laser projector to be tested includes a laser generator, a wavelength conversion component and a preset optical path. A light combining lens is arranged in front of the light spot emitted by the light combining system, and the light spot is emitted into the detection screen through the light combining lens.

[0008] The driving power supply is used to set a DC regulated power supply with different voltages and currents for the laser projector light combining system to be tested; for different types of laser light sources, matching data is set to make the laser light emitter emit light stably, so that the test can be carried out smoothly and avoid damage to the laser projector light combining system due to too strong light;

[0009] The detection screen replaces the original light guide arranged at the front end of the light combining and light emitting lens.

[0010] A detection frame is provided on the detection screen, the size of the detection frame is the same as the inner wall size of the light guide tube, and the setting position is the same as the light guide tube; a detection circle is provided at the center of the detection frame, and the detection circle marks the irradiation position of the preset light path light spot;

[0011] When the detection device is started, the actual light spot position is compared with the detection frame. If the light spot position does not exceed the detection frame range, it indicates that it is consistent with the preset optical path of the light combining system, and the tested light combining system is judged to be a good product. By comparing the actual light spot position with the detection circle on the screen, the direction and degree of optical path deviation of the tested light combining system can be determined, and a maintenance strategy can be formulated.

[0012] A method for detecting an optical path of a laser projector light combining system, characterized by comprising the following steps:

[0013] A detection screen is set at the light entrance position of the original light guide, and the light spot emitted by the light combining system is irradiated onto the detection screen. Specifically, a driving power supply is used to light up the laser projector light source, so that the light emitted by the light source is converted into a wavelength by the light combining system, and then irradiated onto the detection screen through the light combining light emitting lens, and a light spot pattern is formed on the detection screen;

[0014] Compare whether the boundary of the actual irradiated light spot exceeds the detection frame on the detection screen. If the light spot exceeds the detection frame, the light combining system is judged as defective. Otherwise, the light combining system is good. Compare the position and size differences between the actual irradiated light spot and the detection circle to determine the direction and degree of optical path deviation of the tested light combining system and formulate a maintenance strategy.

[0015] The technical solution provided by the present invention has the following beneficial effects: in the present invention, the spatial position of the detection screen is consistent with the position of the light guide tube in the optical machine, the size of the detection frame on the detection screen is equal to the size of the inner wall of the light guide tube, and by comparing the position of the detection frame on the screen with the actual irradiation spot boundary, it is reflected whether the internal light path of the light combining system is consistent with the preset light path, thereby screening out the light combining system whose light path meets the design value; by comparing the size of the actual irradiation spot and the detection circle on the screen, and comparing the positional relationship between the actual irradiation spot and the detection circle, the corresponding maintenance strategy adopted by the tested light combining system is determined, thereby improving the test efficiency, being able to effectively prevent the outflow of defective products, and the test method is simple, intuitive, and efficient;

[0016] This detection method can quickly screen out unqualified optical systems without having to wait until the entire optical machine is assembled. Through testing, it can provide guidance for the repair of defective products, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The structure and features of the present invention are further described below in conjunction with the accompanying drawings and embodiments.

[0018] FIG1 is a schematic diagram of the structure of the present invention.

[0019] FIG2 is a flow chart of the present invention.

[0020] FIG. 3 is a schematic structural diagram of a detection screen provided in an embodiment of the present invention.

[0021] Attached Figure 1 and Figure 3 Among them, 1. Laser projector light combining system, 2. Light combining and light output lens, 3. Detection screen, 4. Driving power supply, 5. Laser generator, 6. Detection frame, 7. Detection circle. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The embodiment of the present invention provides a light path detection device for a laser projector light combining system. Figure 1 As shown, it includes a driving power supply 4, a detection screen 3 and a laser projector light combining system 1 to be tested, and is characterized in that:

[0024] The laser projector to be tested has a laser generator 5, a wavelength conversion component and a preset optical path inside the light combining system. A light combining lens 2 is arranged in front of the light spot of the light combining system, and the light spot is emitted into the detection screen 3 through the light combining lens 2.

[0025] The driving power supply 4 is used to set a DC regulated power supply with different voltages and currents for the laser projector light combining system 1 to be tested; for different types of laser light sources, matching data is set to make the laser light emitter 5 emit light stably, so that the test can be carried out smoothly and avoid damage to the laser projector light combining system due to too strong light;

[0026] The detection screen 3 replaces the original light pipe arranged at the front end of the light combining and light emitting lens, and a detection frame 5 is arranged on the detection screen 3. The size of the detection frame is the same as the inner wall size of the light pipe, and the setting position is the same as the light pipe; a detection circle 7 is arranged at the center of the detection frame 6, and the detection circle 7 marks the irradiation position of the preset light path light spot;

[0027] When the detection device is started, the actual light spot position is compared with the detection frame. If the light spot position does not exceed the range of the detection frame 6, it indicates that it is consistent with the preset optical path of the light combining system, and the tested light combining system is judged to be a good product. By comparing the actual light spot position with the detection circle 7 on the screen, the direction and degree of optical path deviation of the tested light combining system are determined, and a maintenance strategy is formulated.

[0028] An embodiment of the present invention provides a method for detecting the optical path of a laser projector light combining system, as shown in FIG2 , which is a flow chart of a method for detecting the optical path of a laser projector light combining system provided by an embodiment of the present invention. The method is used to detect the collimation of the optical path of the projector light combining system, and the method includes the following steps:

[0029] Step 201: The light spot emitted by the light combining system is irradiated onto the detection screen through the detection device to form a light spot on the receiving screen.

[0030] Step 202, compare whether the light spot exceeds the boundary of the detection frame on the screen, and compare whether there is a difference in the position and size of the light spot and the detection circle. The detection frame represents the edge of the inner wall of the light guide tube. If the light spot exceeds the detection frame, it means that the output light of the light combining system cannot completely enter the light guide tube, so that the parameters of the entire optical system will be reduced; by comparing the positional relationship between the light spot and the detection circle, the offset direction of the light spot can be determined, so as to formulate a suitable maintenance strategy and avoid maintenance through repeated trial assembly and adjustment; by comparing the size of the light spot and the detection circle, it can also be determined that there is an assembly deviation of specific components of the light combining part, so as to provide guidance for maintenance.

[0031] Step 203: The light spot beyond the detection frame is judged as a defective product; the light spot within the detection frame is judged as a good product. According to the previous step, defective products can be quickly detected and guidance can be provided for maintenance.

[0032] This testing method can quickly screen out unqualified light-combining systems without having to wait until the entire optical machine is assembled before testing.

[0033] In the prior art, the optical parameters of an optical machine can only be tested through an optical guide after the optical machine is fully assembled. If the optical parameters are found to be unqualified, the machine needs to be returned for repair. Usually, the cause of the defect can only be determined based on experience, and the defective products can be repaired based on experience. The detection efficiency is low, and the repair and detection process needs to be repeated to meet the qualified requirements. The maintenance efficiency is low, and a lot of experience needs to be accumulated to provide a maintenance strategy.

[0034] In summary, an embodiment of the present invention provides a method for detecting the optical path of a laser projector light combining system, wherein the position of the detection screen is set at the light collecting position of the light guide tube, and a detection frame is set on the screen, and the size and position of the detection frame are the same as the size of the inner wall of the light guide tube. A detection circle is set in the center of the detection frame to mark the irradiation position of the preset light path light spot. The light spot that exceeds the detection frame is judged as a defective product; the light spot that is within the detection frame is judged as a good product. By comparing the positional relationship between the light spot and the detection circle, the offset direction of the light spot can be determined, so as to formulate a suitable maintenance strategy and avoid maintenance through repeated trial assembly and adjustment methods; by comparing the size of the light spot and the detection circle, it can also be determined that there is a deviation in the assembly of specific components of the light combining part, thereby providing guidance for maintenance. This detection method can quickly screen out unqualified light combining systems without having to wait until the entire optical machine is assembled before testing. Through testing, guidance can be provided for the repair of defective products, thereby improving production efficiency.

[0035] In summary, when testing the light-combining system, by comparing the positional relationship between the light spot and the detection circle, the offset direction of the light spot can be determined, thereby formulating a suitable maintenance strategy and avoiding maintenance through repeated trial assembly and adjustment. By comparing the size of the light spot and the detection circle, it can also be determined that there is an assembly deviation of specific components of the light-combining part, thereby providing guidance for maintenance. This detection method can quickly screen out unqualified light-combining systems without having to wait until the entire optical machine is assembled. Through testing, guidance can be provided for the repair of defective products, thereby improving production efficiency.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser projector light combining system optical path detection device, comprising a driving power supply, a detection screen and a laser projector light combining system to be tested, characterized in that: The light combining system of the laser projector to be tested includes a laser generator, a wavelength conversion component and a preset optical path. A light combining lens is arranged in front of the light spot emitted by the light combining system, and the light spot is emitted into the detection screen through the light combining lens. The driving power supply is used to set a DC regulated power supply with different voltages and currents for the laser projector light combining system to be tested; for different types of laser light sources, matching data is set to make the laser light emitter emit light stably, so that the test can be carried out smoothly and avoid damage to the laser projector light combining system due to too strong light; The detection screen replaces the original light guide arranged at the front end of the light combining and light emitting lens. A detection frame is provided on the detection screen, the size of the detection frame is the same as the inner wall size of the light guide tube, and the setting position is the same as the light guide tube; a detection circle is provided at the center of the detection frame, and the detection circle marks the irradiation position of the preset light path light spot; When the detection device is started, the actual light spot position is compared with the detection frame. If the light spot position does not exceed the detection frame range, it indicates that it is consistent with the preset optical path of the light combining system, and the tested light combining system is judged to be good. By comparing the actual light spot position with the detection circle on the screen, the direction and degree of optical path deviation of the tested light combining system can be determined, and a maintenance strategy can be formulated. The detection method of the optical path detection device of the laser projector light combining system is realized by the following method: A detection screen is set at the light entrance position of the original light guide, and the light spot emitted by the light combining system is irradiated onto the detection screen. Specifically, a driving power supply is used to light up the laser projector light source, so that the light emitted by the light source is converted into a wavelength by the light combining system, and then irradiated onto the detection screen through the light combining light emitting lens, and a light spot pattern is formed on the detection screen; Compare whether the boundary of the actual irradiated light spot exceeds the detection frame on the detection screen. If the light spot exceeds the detection frame, the light combining system is judged as defective. Otherwise, the light combining system is good. Compare the position and size differences between the actual irradiated light spot and the detection circle to determine the direction and degree of optical path deviation of the tested light combining system and formulate a maintenance strategy.

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