Three-temperature test fixture for COS (chip on silicon) packaging laser

Abstract

The utility model relates to a chip on silicon (COS) packaging laser three-temperature test fixture, which belongs to the technical field of semiconductor lasers, an upper pressing plate and a lower positioning plate are rotatably closed through a hinge pin, a movable block is mounted at one end of the upper pressing plate close to the lower positioning plate, permanent magnets are mounted on opposite surfaces of the upper pressing plate and the lower positioning plate, and the upper pressing plate and the lower positioning plate are fixed on the movable block. After the structure is adopted, the utility model has the advantages that the floating movable block is designed, the movable block is located at an initial horizontal position under the action of thrust of four internal adjusting springs, the movable block is in contact with the edge of a product when the product is fixed, and the movable block is fixed according to the designed size difference and the spring force; the device is simple in structure and convenient to operate, achieves the compression of a product, is provided with a ventilation system, reduces the time needed by the temperature rising and falling process to the maximum degree, improves the test efficiency, also has the function of stabilizing the system temperature, is high in test efficiency, is convenient to operate, is low in input cost, guarantees the product quality, and solves the problem of cost waste.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor lasers, in particular to a three-temperature test fixture for a COS packaged laser. Background Art

[0002] COS stands for Chip On Submount, which is a chip-on-board packaging process with the advantages of small size, low cost, fast heat dissipation, and high reliability. The main function of COS packaged lasers is to convert electrical signals into optical signals.

[0003] The three-temperature test refers to normal temperature (generally around 25°C) test, low temperature (generally temperature ≤0°C) test and high temperature (generally temperature ≥70°C) test. The purpose of the three-temperature test is: a. to extract the specific index parameters of the product under various temperature conditions and distinguish qualified products from unqualified products; b. to compare the changes in relevant index parameters of the product under various temperature conditions and distinguish products with large changes and unstable performance.

[0004] The traditional testing method is to test only at room temperature, and there is no special fixture to fix the product. It relies on manual hands to hold the electrode pins and power on the product under a microscope for testing. This method has the following disadvantages:

[0005] 1. Insufficient testing conditions: There will be a certain percentage of misjudgment of defective products, resulting in the outflow of defective products;

[0006] 2. No dedicated test fixture: the test environment is simple and the production efficiency is low;

[0007] 3. Manual power-up of the product: The operation is difficult, and the electrode pins can easily damage the outer surface of the product, affecting product quality and increasing costs. Utility Model Content

[0008] The utility model aims to solve the above technical problems and provides a three-temperature test fixture for a COS packaged laser.

[0009] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0010] A three-temperature test fixture for a COS packaged laser comprises an upper clamping plate and a lower positioning plate, wherein the upper clamping plate and the lower positioning plate are rotated and closed by a hinge pin, a step groove is provided on the inner side of one end of the lower positioning plate close to the upper clamping plate for use with a laser product, an adjustable movable block for clamping the laser product is installed on one end of the upper clamping plate close to the lower positioning plate, permanent magnets are installed on the opposite surfaces of the upper clamping plate and the lower positioning plate, and a handle bar is installed on one side of the upper clamping plate;

[0011] The upper clamping plate is provided with a screw for limiting the displacement distance of the movable block, an adjusting spring is provided on the side of the movable block close to the upper clamping plate, and a spring mounting hole for cooperating with the adjusting spring is provided on the upper clamping plate.

[0012] Preferably, a thermocouple for monitoring the temperature of the laser product is installed on the inner wall of the step groove.

[0013] Preferably, an escape opening is provided on the side of the step groove.

[0014] Preferably, a product avoidance slot is provided on the movable block.

[0015] Preferably, an upper cover plate is installed at the lower end of the lower positioning plate, a ventilation mechanism body is installed at the lower end of the upper cover plate, and a bottom pad is relatively arranged at the lower end of the ventilation mechanism body.

[0016] Preferably, an exhaust fan and an electrode core assembly are installed in the ventilation mechanism body, a side vent is provided on one side of the ventilation mechanism body, and a semiconductor cooler is installed on the exhaust fan.

[0017] Preferably, a wiring groove is provided on the upper cover plate.

[0018] Preferably, the electrode ferrule assembly comprises an electrode ferrule body and spring pins on the electrode ferrule body.

[0019] After adopting the above structure, the utility model has the following advantages:

[0020] The utility model adopts a floating movable block design. The movable block in the component will be in an initial horizontal position under the action of the thrust of four internal adjustment springs. When performing the operation of fixing the product, the movable block in the component will contact the edge of the product. According to the designed size difference and spring force, the product is pressed. A ventilation system is set up to minimize the time required for the temperature rise and fall process, improve the test efficiency, and stabilize the system temperature. The test efficiency is high, the operation is convenient, the investment cost is low, the product quality is guaranteed, and the waste of cost is solved.

[0021] The above summary is for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the utility model will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of the structure of the COS packaged laser of the utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the upper pressing plate and the lower positioning plate of the utility model;

[0025] Figure 3 It is an exploded view of the movable block of the utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the electrode core assembly of the utility model;

[0027] Figure 5 It is a structural schematic diagram of the main body of the ventilation mechanism of the utility model;

[0028] Figure 6 It is a schematic diagram of the overall structure of the utility model;

[0029] Figure 7 It is an exploded view of the overall structure of the utility model.

[0030] As shown in the figure: 1. Laser chip; 2. Laser chip light-emitting area; 3. Gold wire welding area; 4. Gold wire; 5. Substrate; 6. Substrate front electrode; 7. Substrate back electrode; 11. Permanent magnet; 12. Screw; 13. Avoidance; 14. Thermocouple; 15. Step groove; 16. Hinge pin; 17. Product avoidance groove; 18. Movable block; 19. Handle rod; 21. Spring mounting hole; 22. Laser product; 23. Adjustment spring; 25. Electrode plug body; 26. Spring needle; 31. Semiconductor refrigerator; 32. Wiring groove; 33. Exhaust fan; 34. Side vent; 35. Bottom pad; 41. Conical groove; 42. Upper clamping plate; 43. Upper cover plate; 44. Ventilation mechanism body; 45. Electrode plug assembly; 46. Lower positioning plate. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] The utility model is further described in detail below in conjunction with the full text.

[0034] Combined with Figure 1-Figure 7 A three-temperature test fixture for a COS packaged laser includes an upper clamping plate 42 and a lower positioning plate 46. The upper clamping plate 42 and the lower positioning plate 46 are rotated and closed by a hinge pin 16. The mechanism in the fixture adopts a hinge block fast clamping design, which is convenient for personnel operation and greatly improves the test efficiency. The inner side of one end of the lower positioning plate 46 close to the upper clamping plate 42 is provided with a step groove 15 used for matching the laser product 22. The step groove 15 is used to place the laser product 22. The upper clamping plate 42 is installed with an adjustable position and The movable block 18 of the laser product 22 is pressed, and the opposite surfaces of the upper pressing plate 42 and the lower positioning plate 46 are both installed with permanent magnets 11. A handle bar 19 is installed on one side of the upper pressing plate 42. The upper pressing plate 42 is driven by the handle bar 19 to rotate close to the lower positioning plate 46. The upper pressing plate 42 and the lower positioning plate 46 are closed by the action of the two permanent magnets 11. The power supply mechanism in the fixture adopts a soft contact structure design, which effectively solves the problem of product surface damage caused by hard contact in the traditional test method, ensures product quality, and solves the waste of cost;

[0035] When the utility model is implemented, Figure 2 and Figure 3 As shown, a screw 12 for limiting the displacement distance of the movable block 18 is installed on the upper clamping plate 42, and the screw 12 is used to limit the displacement distance of the movable block 18. An adjusting spring 23 is installed on the side of the movable block 18 close to the upper clamping plate 42. A spring mounting hole 21 for cooperating with the adjusting spring 23 is provided on the upper clamping plate 42. Specifically, one end of the adjusting spring 23 is connected to the movable block 18, and the other end is connected to the upper clamping plate 42. A screw hole for cooperating with the screw 12 is provided on the upper clamping plate 42. The screw 12 can be a large flat head screw. The screws 12 are arranged in 4 groups and rotate in the screw hole to limit the displacement distance of the movable block 18. The adjusting spring 23 is adjusted in the spring mounting hole 21.

[0036] When the utility model is implemented, Figure 1 and Figure 2As shown, the laser product 22 includes a laser chip 1 in the middle; a laser chip light-emitting area 2; a laser chip electrode, i.e., a gold wire welding area 3; a gold wire 4, used for circuit connection between the chip electrode and the substrate electrode; a substrate 5 used for COS packaging; a substrate front electrode 6, i.e., a gold wire 4 welding area; and a substrate back electrode 7 connected to an external component circuit. Figure 1 These are the front and back sides of the laser product 22 .

[0037] When the utility model is implemented, Figure 2 and Figure 3 As shown, a thermocouple 14 for monitoring the temperature of the laser product 22 is installed on the inner wall of the step groove 15. The thermocouple 14 is a prior art. The thermocouple 14 is used to monitor the temperature of the product. A clearance opening 13 is provided on the side of the step groove 15. The clearance opening 13 on the side of the step groove 15 is convenient for loading and unloading the product. The product installation step groove 15 is designed according to the product's external dimensions. Considering the convenience of taking out and putting in the product, the process clearance openings 13 are designed on both sides of the groove.

[0038] The movable block 18 is provided with a product avoidance notch 17 for cooperating with and pressing the laser product 22 .

[0039] When the utility model is implemented, Figure 5 , Figure 6 and Figure 7 As shown, the lower end of the lower positioning plate 46 is installed with an upper cover plate 43, the lower end of the upper cover plate 43 is installed with a ventilation mechanism body 44, and the lower end of the ventilation mechanism body 44 is relatively provided with a bottom pad block 35. An exhaust fan 33 and an electrode plug assembly 45 are installed in the ventilation mechanism body 44, and a side vent 34 is provided on one side of the ventilation mechanism body 44. A semiconductor refrigerator 31 is installed on the exhaust fan 33. The semiconductor refrigerator 31 (TEC) heats and cools the entire system. The exhaust fan 33 accelerates the temperature cycle of the entire test environment. The bottom pad block 35 is provided so that the bottom vent also has a circulation effect. The TEC (semiconductor refrigerator 31) technical principle is cited. While considering the design cost investment, the size of the fixture is also limited to the greatest extent, which is convenient for personnel to operate. A ventilation system is designed inside the fixture to minimize the time required for the heating and cooling process, improve the test efficiency, and also have the effect of stabilizing the system temperature.

[0040] The TEC realizes heating and cooling of the product, the thermocouple 14 realizes detection of the test temperature, and the exhaust fan 33 realizes stabilization and acceleration of the test system temperature.

[0041] A wiring groove 32 is formed on the upper cover plate 43 .

[0042] When the utility model is implemented, Figure 4As shown, the electrode core assembly 45 includes an electrode core body 25 and a spring pin 26 on the electrode core body 25. The electrode core body 25 is made of high-temperature resistant non-metallic material. The spring pin 26 extends into the step groove 15. The laser product 22 is placed on the step groove 15. At this time, the positive and negative electrodes at the bottom of the laser product 22 are in contact with the spring pin 26 in the electrode core assembly.

[0043] The electrode plug assembly 45 has two rows of embedded spring pins 26 to respectively connect and power the two electrodes on the back of the product. Three spring pins 26 are used in each row to reduce the impedance problem of the connection circuit. At the same time, the soft structure design of the spring pins 26 can effectively avoid damage to the product appearance.

[0044] The conical groove 41 is provided on the upper pressing plate 42. The upper plane of the movable block adopts a conical groove design, and the conical groove 41 is connected to the product avoidance notch 17, which is convenient for observing the product.

[0045] The working principle of this utility model:

[0046] The operation process is as follows:

[0047] 1. Move the handle rod 19 to open the upper pressing plate 42;

[0048] 2. Place the laser product 22 into the step groove 15 in the lower positioning plate 46 to complete the product loading operation. At this time, the positive and negative electrodes at the bottom of the laser product 22 are in contact with the spring pins 26 in the electrode insert assembly;

[0049] 3. Move the handle bar 19 again to close the upper clamping plate 42. At this time, the permanent magnets 11 of the upper clamping plate 42 and the lower positioning plate 46 will automatically attract each other, so that the two components fit tightly together, thereby achieving the clamping operation of the product;

[0050] 4. Start the test system to test the product and extract data;

[0051] 5. Finally, the handle bar 19 is moved to open the upper pressing plate 42, and the tested laser product 22 is taken out to complete the entire test operation of the product. The test operation of all products can be completed in this way.

[0052] The above describes the utility model and its implementation methods, which is not restrictive. What is shown in the full text is only one of the implementation methods of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it, without departing from the purpose of the invention of the utility model, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the utility model.

Claims

1. A three-temperature test fixture for COS packaged lasers, characterized in that: It comprises an upper clamping plate (42) and a lower positioning plate (46), wherein the upper clamping plate (42) and the lower positioning plate (46) are rotated and closed by a hinge pin (16), a step groove (15) for cooperating with a laser product (22) is provided on the inner side of one end of the lower positioning plate (46) close to the upper clamping plate (42), a movable block (18) with adjustable position and for clamping the laser product (22) is installed on one end of the upper clamping plate (42) close to the lower positioning plate (46), permanent magnets (11) are installed on the opposite surfaces of the upper clamping plate (42) and the lower positioning plate (46), and a handle rod (19) is installed on one side of the upper clamping plate (42); A screw (12) for limiting the displacement distance of the movable block (18) is installed on the upper clamping plate (42), an adjustment spring (23) is installed on a side of the movable block (18) close to the upper clamping plate (42), and a spring installation hole (21) for cooperating with the adjustment spring (23) is provided on the upper clamping plate (42).

2. According to claim 1, a three-temperature test fixture for COS packaged lasers, characterized in that: A thermocouple (14) for monitoring the temperature of the laser product (22) is installed on the inner wall of the step groove (15).

3. According to claim 1, a three-temperature test fixture for COS packaged lasers, characterized in that: A side edge of the step groove (15) is provided with an escape opening (13).

4. According to claim 1, a three-temperature test fixture for COS packaged lasers, characterized in that: The movable block (18) is provided with an avoidance notch (17) for cooperating with and pressing the laser product (22).

5. According to claim 1, a three-temperature test fixture for COS packaged lasers, characterized in that: An upper cover plate (43) is mounted on the lower end of the lower positioning plate (46), a ventilation mechanism body (44) is mounted on the lower end of the upper cover plate (43), and a bottom padding block (35) is disposed opposite to the lower end of the ventilation mechanism body (44).

6. A three-temperature test fixture for COS packaged lasers according to claim 5, characterized in that: An exhaust fan (33) and an electrode core assembly (45) are installed in the ventilation mechanism main body (44); a side vent (34) is provided on one side of the ventilation mechanism main body (44); and a semiconductor cooler (31) is installed on the exhaust fan (33).

7. The three-temperature test fixture for COS packaged laser according to claim 5, characterized in that: The upper cover plate (43) is provided with a wiring groove (32).

8. The three-temperature test fixture for COS packaged laser according to claim 6, characterized in that: The electrode core plug assembly (45) comprises an electrode core plug body (25) and a spring pin (26) on the electrode core plug body (25).

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