Bar screening device based on light spots
By using a spot-based bar screening device, efficient and automated detection of laser bars has been achieved, solving the problems of damage detection and wasted manpower, and improving product yield and detection accuracy.
Patent Information
- Application Number
- CN202422879729.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Existing laser bar testing methods are prone to damaging chips, the testing conditions do not match actual applications, and human resources are wasted, resulting in low product yield.
A bar screening device based on light spot is adopted, including a camera, sleeve, attenuator, cooling water block and solder sheet. The device achieves automated detection by observing the light spot, avoiding high current testing and manual observation under a microscope.
It effectively reduces product failure and rework rates, minimizes testing deviations, saves human resources, and improves testing efficiency and product yield.
Smart Images
Figure CN223587769U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of semiconductor laser testing, and particularly relates to a bar selection device based on light spot. BACKGROUND
[0002] With the expansion of the application field of the laser and the increase of the demand, the laser array development has stepped into the stage of high power, low cost and high reliability. The market gradually improves the requirement for the laser, and the current is also increased with the increase of the power. Under the condition of the large current operation, the reliability requirement for the bar is higher, how to quickly, conveniently and accurately test the performance of the bar, reduce the later bad rework and improve the product yield has very important practical significance.
[0003] The current detection mainly includes the following steps: (1) the laser chip and the tungsten copper heat sink are welded by using gold tin solder, and the welding structure is called "sandwich"; (2) the sandwich is placed on the test table (without water) and is tested by using large current and small pulse width; (3) after the test is completed, the COD of each light emitting point of the bar is observed under the microscope.
[0004] The defects of the test mode are as follows:
[0005] If the chip fails after gold tin sintering test, the tungsten copper heat sink and the gold tin solder piece will be lost;
[0006] The test by using large current and small pulse width is not consistent with the actual application condition, and there is test deviation;
[0007] After the test is completed, each light emitting point needs to be observed under the microscope, and the manpower is wasted. Utility model content
[0008] In order to overcome the damage and deviation of the screened bar, the utility model provides a bar selection device based on light spot.
[0009] The utility model adopts the technical scheme that:
[0010] A bar selection device based on light spot, including camera, sleeve, attenuation piece, first cold water block, second cold water block, spring, platform.
[0011] The bar to be screened is arranged between the first cold water block and the second cold water block on the central axis of the sleeve.
[0012] The first cold water block is arranged on the platform, the second cold water block is arranged above the first cold water block, the spring is arranged between the first cold water block and the second cold water block, the spring supports the second cold water block, and the screw rod penetrates through the spring and the second cold water block.
[0013] The recess is arranged on the first cold water block and is used for placing and fixing the bar.
[0014] The second cold water block is provided with a protrusion corresponding to the groove of the first cold water block, and the protrusion is used for fixing the bar.
[0015] The first cold water block is a positive electrode, and the second cold water block is a negative electrode. The P face of the bar is connected with the first cold water block, and the N face of the bar is connected with the second cold water block.
[0016] The attenuation piece and the camera are located at two ends of the sleeve, and the attenuation piece is located at the end close to the bar. The camera is used for observing the light spot of the bar, and the attenuation piece is used for attenuating the laser of the bar.
[0017] The bar screening device further comprises a soldering sheet, and the soldering sheet is used for flexibly fixing the bar.
[0018] The two soldering sheets are respectively located between the first cold water block groove, the second cold water block protrusion and the bar.
[0019] The P face of the bar is connected with the first cold water block through the soldering sheet, and the N face of the bar is connected with the second cold water block through the soldering sheet.
[0020] The soldering sheet is an indium soldering sheet.
[0021] The bar screening device further comprises a processor connected with the camera and used for observing the light spot condition of the bar.
[0022] The processor is a computer.
[0023] The first cold water block and the second cold water block are used for heat dissipation of the bar.
[0024] The temperature of the room temperature water introduced into the first cold water block and the second cold water block is 25 DEG C.
[0025] The bar screening device has the following advantages:
[0026] The bar screening device based on a light spot has the following advantages: first, the product failure caused by a poor light spot can be effectively reduced. Second, the deviation caused by different test methods is reduced because the test condition is the same as the use condition. Third, the bar does not need to be packaged into a sandwich for testing, and waste is reduced. Fourth, the camera is directly connected with the computer, and manpower is not needed for observing under a microscope, and manpower resources are saved. BRIEF DESCRIPTION OF DRAWINGS
[0027] Figure 1 is a structure schematic diagram of the screening device of the embodiment of the utility model.
[0028] Reference signs: 1. camera, 2. sleeve, 3. attenuation sheet, 4. first cold water block, 5. second cold water block, 6. spring, 7. screw rod, 8. nut, 9. water inlet hole. DETAILED DESCRIPTION
[0029] The utility model will be described in further detail below in combination with the drawings and specific embodiments.
[0030] The utility model discloses a novel testing method according to the defect characteristics of laser chip testing, and the utility model points as follows:
[0031] 1. the first cold water block 4 fixed water, the surface is placed with soft metal indium and bar P surface, like this, it is helpful to chip heat dissipation when working, and the first cold water block 4 is positive pole;
[0032] 2. the second cold water block 5 movable water, the surface is placed with soft metal indium and bar N surface, like this, it is helpful to chip heat dissipation when working, and the second cold water block 5 is negative pole
[0033] Laser attenuation sheet 3 and camera 1 are installed at the light emitting place of chip, and the main function of attenuation sheet 3 is to prevent laser from causing burning loss to camera 1.
[0034] Embodiment one
[0035] A bar screening device based on light spot, as shown in Figure 1 .
[0036] 1. the first cold water block 4 is fixed on the platform, and the first cold water block 4 has water inlet hole 9 and water outlet hole, and 25 DEG C water is passed, and the recess of the first cold water block 4 is placed with indium soldering sheet, and the chip is placed on the soldering sheet.
[0037] 2. the second cold water block 5 is supported by spring, and the second cold water block 5 has water inlet hole 9 and water outlet hole, and 25 DEG C water is passed, and the convex block of the second cold water block 5 is placed with indium soldering sheet.
[0038] 3. sleeve 2 one side places attenuation sheet 3, and the other side places camera 1.
[0039] 4. camera 1 is connected with computer and is used for observing light spot condition.
Claims
1. A spot-based bar screening device, characterized by, It comprises a camera (1), a sleeve (2), an attenuation sheet (3), a first cold water block (4), a second cold water block (5), a spring (6), a platform; The first cold water block (4) is located on the platform, and the second cold water block (5) is located above the first cold water block (4). The spring (6) is arranged between the first cold water block (4) and the second cold water block (5), and supports the second cold water block (5). The screw rod (7) penetrates the spring (6) and the second cold water block (5); The bar to be screened is located between the first cold water block (4) and the second cold water block (5) and on the central axis of the sleeve (2); The first cold water block (4) is provided with a groove for placing and fixing the bar; The second cold water block (5) is provided with a protrusion corresponding to the groove of the first cold water block (4) for fixing the bar; The first cold water block (4) is a positive electrode, and the second cold water block (5) is a negative electrode. The P surface of the bar is connected with the first cold water block (4), and the N surface of the bar is connected with the second cold water block (5); The attenuation sheet (3) and the camera (1) are respectively located at two ends of the sleeve (2), and the attenuation sheet (3) is located at the end close to the bar. The camera (1) is used for observing the light spot of the bar, and the attenuation sheet (3) is used for attenuating the laser of the bar.
2. The ribbon screen device of claim 1, wherein, It also comprises a soldering sheet for flexible fixing of the bar; The soldering sheet is provided with two pieces, which are respectively located between the first cold water block groove, the second cold water block protrusion and the bar; The P surface of the bar is connected with the first cold water block (4) through the soldering sheet, and the N surface of the bar is connected with the second cold water block (5) through the soldering sheet.
3. The ribbon screen device of claim 2, wherein, The soldering sheet is an indium soldering sheet.
4. The ribbon screen device of claim 1, wherein, It also comprises a processor connected with the camera for observing the light spot condition of the bar.
5. The ribbon screen device of claim 4, wherein, The processor is a computer.
6. The ribbon screen device according to any one of claims 1 to 5, wherein The first cold water block (4) and the second cold water block (5) are used for heat dissipation of the bar. The first cold water block (4) and the second cold water block (5) are provided with water inlet holes (9) and water outlet holes, and room temperature water is introduced.
7. The ribbon screen device of claim 6, wherein, The temperature of the room temperature water introduced into the first cold water block (4) and the second cold water block (5) is 25℃.