Simple COS sintering test fixture
By designing a simple COS sintering test fixture, using stainless steel T-block and limit frame slot structure, the problems of complexity and low efficiency of existing fixtures are solved, and multi-chip fixation and efficient sintering are achieved.
Patent Information
- Application Number
- CN202422074815.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-27
AI Technical Summary
The existing COS sintering fixtures are complex in design, many parts, cumbersome installation, and high cost. They can only press one chip at a time, which is inefficient.
A simple COS sintering test fixture including a base plate, a limit frame, and a block is designed. The block is made of stainless steel. The chip is fixed by its own gravity. There are multiple slots on the limit frame. The block can be slidably pressed on the chip. It combines the baffle and the pad to achieve multi-chip fixation to ensure consistency of stress.
The simultaneous fixation of multiple chips is achieved, ensuring the consistency of sintering quality, simple structure, low cost, convenient operation, and improved production efficiency.
Smart Images
Figure CN223130477U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chip sintering, in particular to a simple COS sintering test fixture. Background Art
[0002] COS (chip on submount) is one of the mainstream semiconductor laser packaging forms. Its sintering fixture is mainly used to position and press the solder sheet and the laser chip at the specified position of the packaging shell to prevent the relative position movement of the chip, solder and shell before entering the sintering furnace, and give a certain pressure to the chip during the sintering welding process to make the fit between the chip and the shell better, meeting the high requirements of the sintering quality of the laser component.
[0003] Although the current sintering fixtures basically meet the usage requirements, there are some disadvantages: they use more parts, have a complex design, and a cumbersome installation process, resulting in a higher cost, and each time only one chip can be pressed, with low efficiency. Content of the Utility Model
[0004] The utility model aims to provide a simple COS sintering test fixture to overcome the deficiencies in the prior art.
[0005] To solve the above technical problems, the technical solution of the utility model is: a simple COS sintering test fixture, including a bottom plate, a limit frame, and a pressing block. The bottom plate is provided with a positioning structure for fixing the packaging shell. The limit frame is fixed above the bottom plate through a support, and the limit frame is provided with a plurality of slots arranged side by side above the packaging shell. There are also a plurality of pressing blocks, which are correspondingly arranged with the slots. The pressing blocks are made of stainless steel and are T-shaped blocks. The lower ends of the pressing blocks are inserted into the slots, and the pressing blocks slide in the slots under their own gravity so that the bottom of the pressing blocks presses above the chip, fixing the positions of the chip, solder and packaging shell.
[0006] Further, the above simple COS sintering test fixture further includes a baffle. The slot is an open slot, and its open end faces forward. The baffle is arranged on the front side of the limit frame and closes the open end of the slot.
[0007] Further, in the above simple COS sintering test fixture, the pressing block includes a large end of the pressing block arranged horizontally and a small end of the pressing block arranged vertically. The two ends of the large end of the pressing block protrude out of the slot, and an operation hole is provided in the middle. The small end of the pressing block is inserted into the slot and is in clearance fit with the slot.
[0008] Further, in the above simple COS sintering test fixture, each outer side surface of the small end of the pressing block is provided with a long strip-shaped shallow groove.
[0009] Further, in the above-mentioned simple COS sintering test fixture, a positioning portion adapted to the chip is provided at the bottom of the pressing block. The positioning portion includes a groove provided in the middle of the bottom surface of the pressing block, and the shape of the groove is adapted to the outer shape of the chip.
[0010] Further, in the above-mentioned simple COS sintering test fixture, the positioning portion further includes a convex block protruding from the side surface of the small end of the pressing block. The convex block is provided on one side of the bottom of the pressing block, cooperates with the outer side of the chip, and the protruding height of the convex block is less than the height of the chip.
[0011] Further, in the above-mentioned simple COS sintering test fixture, a cushion block is further included. The cushion block is movably connected to the limiting frame and is provided between the top surface of the limiting frame and the bottom surface of the large ends of all the pressing blocks to limit the downward sliding position of the pressing blocks in the slots.
[0012] Further, in the above-mentioned simple COS sintering test fixture, the cushion block is a U-shaped block, and a limiting groove with an opening is provided in the middle thereof. The limiting groove is arranged along the arrangement direction of the plurality of pressing blocks, is inserted outside the small ends of the pressing blocks and supports the large ends of the pressing blocks.
[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model can simultaneously fix a plurality of chips, ensure that each chip is subjected to the same force, has good force consistency, ensures the consistency of sintering quality, and the pressing block can be reused. It is a sintering fixture with good consistency of pressing force and sintering quality; and it has a simple structure, is small and light, has a low procurement cost, is convenient for mass production, and is also convenient for installation and operation, improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0015] Figure 1 It is a three-dimensional structure schematic diagram of the simple COS sintering test fixture of the present utility model;
[0016] Figure 2 It is a front view of the simple COS sintering test fixture of the present utility model;
[0017] Figure 3 It is a partial schematic diagram of the simple COS sintering test fixture of the present utility model;
[0018] Figure 4 It is a schematic diagram of the pressing block of the simple COS sintering test fixture of the present utility model;
[0019] In the figure: 1, bottom plate; 2, limit frame; 21, slot; 3, pressing block; 31, large end of the pressing block; 32, small end of the pressing block; 33, operation hole; 34, shallow groove; 35, groove; 36, convex block; 4, support; 5, baffle; 6, cushion block; 61, limit groove. Specific embodiments
[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative work fall within the protection scope of the present invention.
[0021] Embodiment 1
[0022] As Figures 1-4 shown, a simple COS sintering test fixture includes a bottom plate 1, a limit frame 2, and a pressing block 3. A positioning structure for fixing the encapsulation shell is provided on the bottom plate 1. In this embodiment, the positioning structure is a threaded hole provided on the bottom plate 1 and a fastener passing through the threaded hole. The limit frame 2 is fixed above the bottom plate 1 through a support 4, and a plurality of slots 21 arranged side by side and located above the encapsulation shell are provided on the limit frame 2. A plurality of pressing blocks 3 are also provided, corresponding to the slots 21. The pressing blocks 3 are made of stainless steel with a high material density, and can utilize their own gravity to provide a certain pressure for pressing the chip. The pressing blocks 3 are T-shaped blocks, and their lower ends are inserted into the slots 21, which can limit the sliding height and avoid damaging the chip. The pressing blocks 3 slide in the slots 21 under their own gravity, so that the bottom of the pressing blocks 3 presses on the chip, fixing the positions of the chip, solder, and encapsulation shell.
[0023] As Figures 1-2 shown, the above-mentioned simple COS sintering test fixture further includes a baffle 5. The slot 21 is an open slot, and its open end faces forward. The baffle 5 is arranged on the front side of the limit frame 2 and closes the open end of the slot 21, and is detachably connected to the limit frame 2 through a fastener.
[0024] Among them, the bottom plate 1 is made of copper with good heat conduction performance, which is conducive to the bottom plate 1 conducting the heat of the heating furnace upward to the encapsulation shell to ensure the sintering effect. The limit frame 2 and the baffle 5 are both made of brass with moderate material hardness, which is convenient for machining and not easy to deform. In summary, the present invention can simultaneously fix multiple chips, ensure that each chip is subjected to the same force, has good force consistency, ensures the consistency of sintering quality, and the pressing blocks can be reused. It is a sintering fixture with good pressing force and sintering quality consistency; and it has a simple structure, is small and light, has a low procurement cost, is convenient for mass production, and is also convenient for installation and operation, improving production efficiency.
[0025] In the above structure, as Figures 1-2 , as shown in 4, the pressing block 3 includes a large pressing block end 31 arranged horizontally and a small pressing block end 32 arranged vertically. Both ends of the large pressing block end 31 protrude from the slot 21, and an operation hole 33 is provided in the middle thereof, which is convenient for taking the pressing block. The small pressing block end 32 is inserted into the slot 21 and is in clearance fit with the slot 21.
[0026] As Figure 1 , 4 shown, each outer side surface of the small pressing block end 32 is provided with a long strip-shaped shallow groove 34, and the shallow groove 34 can reduce the contact surface between the pressing block 3 and the limit frame 2 when the pressing block 3 slides down, reducing friction and wear.
[0027] As Figure 2 , 4 shown, the bottom of the pressing block 3 is provided with a positioning portion for cooperating with the chip. The positioning portion includes a groove 35 provided in the middle of the bottom surface of the pressing block 3, and the shape of the groove 35 is adapted to the outer shape of the chip, which can avoid damaging the chip when the pressing block 3 is pressed down. The positioning portion further includes a convex block 36 protruding from the side surface of the small pressing block end 32. The convex block 36 is provided on one side of the bottom of the pressing block 3 and cooperates with the outside of the chip, and the protruding height of the convex block 36 is less than the height of the chip, improving the positioning height when the pressing block 3 is pressed down.
[0028] Embodiment 2
[0029] Based on the structure of Embodiment 1, as Figure 1 , 2 shown, the above simple COS sintering test fixture further includes a spacer block 6. The spacer block 6 is movably connected to the limit frame 2 and is arranged between the top surface of the limit frame 2 and the bottom surface of the large pressing block end 31 of all the pressing blocks 3 to limit the sliding position of the pressing block 3 in the slot 21. The spacer block 6 is made of aluminum alloy material, which has a low unit price, high strength, is convenient for manufacturing, and the height of the spacer block 6 can be set according to requirements. The spacer block 6 can be reused, thereby controlling the sliding height of the pressing block 3 and reducing the damage to the chip while ensuring the pressing force.
[0030] Among them, as Figure 1 shown, the spacer block 6 is a U-shaped block, and a limiting groove 61 with an opening is provided in the middle thereof. The limiting groove 61 is arranged along the arrangement direction of a plurality of pressing blocks 3, is inserted outside the small pressing block end 32 and supports the large pressing block end 31. By pulling out the spacer block 6 in the reverse direction of the opening of the limiting groove 61, the pressing block 3 can be made to freely fall and press on the chip in sequence, fixing the positions of the chip, the solder and the encapsulation housing.
[0031] The usage method of the simple COS sintering test fixture of the present utility model is as follows: First, assemble a plurality of pressing blocks 3 with the limiting frame 2 and the baffle 5, then insert the cushion block 6 between the pressing block 3 and the limiting frame 2 to lift the pressing block 3 to form a pressing block module; use fasteners to fix the encapsulation housing and the support 4 on the bottom plate 1, and place solder and chips in the encapsulation housing; then fix the pressing block module on the support 4, pull out the cushion block 6, and the pressing block 3 sequentially falls onto the chips to fix the positions of the chips, solder and the encapsulation housing; it can simultaneously fix a plurality of chips, ensure that each chip is subjected to the same force, and ensure the consistency of the sintering quality.
[0032] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.
[0033] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A simple COS sintering test fixture, characterized in that: It includes a bottom plate, a limit frame, and a pressing block. A positioning structure for fixing the encapsulation housing is provided on the bottom plate. The limit frame is fixed above the bottom plate through a support, and a plurality of slots arranged side by side and located above the encapsulation housing are provided on the limit frame. A plurality of pressing blocks are also provided, which are arranged corresponding to the slots. The pressing blocks are made of stainless steel and are T-shaped blocks. The lower ends of the pressing blocks are inserted into the slots. Under the action of its own gravity, the pressing blocks slide in the slots so that the bottom of the pressing blocks presses on the chip, fixing the positions of the chip, solder, and encapsulation housing.
2. The simple COS sintering test fixture according to claim 1, wherein: It further includes a baffle. The slot is an open slot, and its open end faces forward. The baffle is provided on the front side of the limit frame and closes the open end of the slot.
3. The simple COS sintering test fixture according to claim 2, characterized in that: The pressing block includes a horizontally arranged large end of the pressing block and a vertically arranged small end of the pressing block. Both ends of the large end of the pressing block protrude from the slot, and an operation hole is provided in the middle of the large end of the pressing block. The small end of the pressing block is inserted into the slot and is in clearance fit with the slot.
4. The simple COS sintering test fixture according to claim 3, wherein: Each outer side surface of the small end of the pressing block is provided with a long and narrow shallow groove.
5. The simple COS sintering test fixture according to claim 3, characterized in that: A positioning portion for cooperating with the chip is provided at the bottom of the pressing block. The positioning portion includes a groove provided in the middle of the bottom surface of the pressing block, and the shape of the groove is adapted to the outer shape of the chip.
6. The simple COS sintering test fixture according to claim 5, wherein: The positioning portion further includes a convex block protruding from the side surface of the small end of the pressing block. The convex block is provided on one side of the bottom of the pressing block and cooperates with the outer side of the chip, and the protruding height of the convex block is less than the height of the chip.
7. The simple COS sintering test fixture according to claim 1, wherein: It further includes a cushion block. The cushion block is movably connected to the limit frame and is provided between the top surface of the limit frame and the bottom surface of the large end of all pressing blocks, restricting the downward sliding position of the pressing blocks in the slots.
8. The simple COS sintering test fixture according to claim 7, wherein: The cushion block is a U-shaped block, and a limited slot with an opening is provided in the middle of the cushion block. The limited slot is arranged along the arrangement direction of the plurality of pressing blocks, is inserted outside the small end of the pressing block, and supports the large end of the pressing block.