A precision fixture for TO product packaging

Abstract

The present invention discloses a precision fixture for TO product packaging, which includes a fixture body. A plurality of positioning holes for fixing TO products are formed on the fixture body. The TO products are placed in the positioning holes, and the surface of the uppermost end of the TO products is lower than the surface of the orifice of the positioning holes. Advantages: The fixture of the present invention uses vacuum adsorption, has a simple structure, low cost, and is convenient for disassembly and assembly (just turn off the vacuum air circuit switch), and can reduce the damage to the product appearance caused by mechanical pressing; this solution has a high degree of automation and can cooperate with another fixture for a higher degree of automated operation.

Description

Technical Field

[0001] The present invention relates to a precision fixture for TO product packaging. Background Art

[0002] At present, the workshops in the optical communication industry are mostly equipped with vacuum pipelines. Vacuum adsorption of products is convenient, low-cost, and not easy to damage products, which is an ideal fixing method for micro-devices. However, at present, vacuum adsorption is mostly used for products with large flat bottom and side surfaces, such as BOX products. The bottom and side surfaces of TO products have soldering, are uneven, and have pins about 7 mm long, making vacuum adsorption very difficult.

[0003] Moreover, TO products are circular shells. For high-end TO products, their direction needs to be considered during chip mounting and wire bonding processes. Since TO products are circular, how to control their direction?

[0004] The existing technical solution is to press the product with a pressing plate, which has a complex structure, high cost, difficult disassembly and assembly, and cannot cooperate with automated equipment for operation. The patented fixture has a high degree of automation and is modified to be able to cooperate with automated equipment for operation. Summary of the Invention

[0005] In view of the technical problems that the pressing plate for pressing TO products has a complex structure, high cost, difficult disassembly and assembly, and cannot cooperate with automated equipment for operation, and the patented fixture has a high degree of automation and is modified to be able to cooperate with automated equipment for operation, the present invention provides a precision fixture for TO product packaging, and the specific technical solution is as follows:

[0006] A precision fixture for TO product packaging includes a fixture body. A plurality of positioning holes for fixing TO products are opened on the fixture body. The TO product is placed in the positioning hole, and the surface of the uppermost end of the TO product is lower than the surface of the orifice of the positioning hole.

[0007] The positioning hole is a stepped hole composed of an upper guiding section, a middle limiting section, a lower TO product pin avoiding section, and a lowermost TO product pin positioning section. The inner diameter of the guiding section is equal to the inner diameter of the limiting section. The inner diameter of the TO product pin avoiding section is smaller than the inner diameter of the limiting section. A hole shoulder is formed between the limiting section and the TO product pin avoiding section. The maximum inner diameter of the TO product pin positioning section is smaller than the inner diameter of the TO product pin avoiding section. The TO product pin positioning section accommodates all the pins inside one TO product, and at least three pin limiting holes for corresponding insertion of three pins respectively are concavely arranged on the hole wall of the TO product pin positioning section. The center lines of the pin limiting holes are parallel to the center line of the positioning hole.

[0008] The limiting part on the circular shell of the TO product is located in the limiting section of the positioning hole, and a gap is left between the outer surface of the limiting part and the inner hole wall of the limiting section.

[0009] The lower end surface of the round tube shell of the TO product is partially attached to the surface of the hole shoulder. The surface of the lower end surface of the round tube shell of the TO product that is attached to the hole shoulder is defined as the limiting surface, and the rest is the vacuum adsorption surface.

[0010] In the technical solution of the present invention, the fixture controls the rotational freedom from the pins of the TO product. The pins are not arranged in a circular array, and the purpose of limiting the rotational freedom of the TO product can be achieved by limiting the pins. At the same time, a balance is achieved between the vacuum adsorption area and the bonding area between the product and the fixture, ensuring that the product is placed firmly while increasing the vacuum adsorption area of ​​the product as much as possible to ensure stable adsorption of the product.

[0011] In a further preferred embodiment of the technical solution of the present invention, the fixture body is composed of a fixture panel and a surrounding plate, the positioning hole is provided on the fixture panel, the surrounding plate is vertically arranged on the back of the fixture panel for supporting the fixture panel, and the internal space of the surrounding plate is used as a vacuum air path. The fixture is installed on the patch bonding equipment through the fixture body, and the shape design of the fixture body is designed in combination with the requirements of the patch bonding equipment and is the result of creative labor.

[0012] In a further preferred embodiment of the technical solution of the present invention, all the positioning holes are distributed on the fixture panel in a "well" shape. The positioning holes are distributed throughout the fixture panel as much as possible, so that as many TO products as possible can be installed in one fixture clamping.

[0013] In a further preferred embodiment of the technical solution of the present invention, the hole of the upper guide section is a tapered hole with a taper of 120°. The purpose of designing the upper tapered hole is to guide the entry of TO products.

[0014] In a further preferred embodiment of the technical solution of the present invention, the holes of the middle limiting section and the TO product pin avoiding section of the lower layer are all round holes. The round hole design is more suitable for the appearance of the TO product.

[0015] In a further preferred embodiment of the technical solution of the present invention, the opening of the TO product pin positioning section is rounded. The rounded corner design protects the TO product pins.

[0016] In a further preferred embodiment of the technical solution of the present invention, the clamp body is made of aluminum alloy material. Aluminum alloy material AL6061 (material grade) is used to place products and release static electricity of the products.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The precision fixture for TO product packaging of the present invention adopts vacuum adsorption, has a simple structure, low cost, and is easy to disassemble and assemble (just turn off the vacuum air circuit switch), and can reduce the damage to the product appearance caused by mechanical compression; this solution has a high degree of automation and can be combined with another fixture to perform a higher degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the front view of the precision fixture for TO product encapsulation.

[0020] Figure 2 It is the right view of the precision fixture for TO product encapsulation.

[0021] Figure 3 It is the rear view of the precision fixture for TO product encapsulation.

[0022] Figure 4 It is Figure 1 the A-A sectional view of

[0023] Figure 5 It is Figure 4 the enlarged view at C in

[0024] Figure 6 It is Figure 1 the enlarged view at B in

[0025] Figure 7 It is for the TO product and Figure 1 the front view after the fixture in

[0026] Figure 8 It is for the TO product and Figure 1 the side view after the fixture in

[0027] Figure 9 It is for the TO product and Figure 1 the rear view after the fixture in

[0028] Figure 10 It is Figure 7 the D-D sectional view of

[0029] Figure 11 It is Figure 10 the enlarged view at E in

[0030] Figure 12 It is Figure 9 the enlarged view at F in Specific embodiments

[0031] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further describes the present invention in detail with reference to the attached Figures 1 - 12 drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] Such as Figure 1 , 2, as shown in Figures 3 and 4, a precision fixture for TO product packaging includes a fixture body 1, and a plurality of positioning holes 2 for fixing TO products are provided on the fixture body 1.

[0033] As Figure 1 , 2 , as shown in Figures 3 and 4, the fixture body 1 is composed of a fixture panel 11 and a surrounding plate 12. The positioning holes 2 are provided on the fixture panel 11. The surrounding plate 12 is vertically arranged on the back of the fixture panel 11 to support the fixture panel 11, and the internal space of the surrounding plate 12 serves as a vacuum air path.

[0034] The fixture of this embodiment is installed on the chip bonding and wire bonding equipment through the fixture body. The shape design of this fixture body is designed in combination with the requirements of the chip bonding and wire bonding equipment and is the result of creative labor.

[0035] The fixture body 1 is made of aluminum alloy material AL6061 (material grade), which is used to place products and can release the static electricity of the products. AL6061 is a known material grade of aluminum alloy and is known to those skilled in the art.

[0036] As Figure 1 and 3 shown, all the positioning holes 2 are distributed in a "well" shape on the fixture panel 11. The positioning holes 2 are arranged as densely as possible on the entire fixture panel 11 so that as many TO products 3 can be installed in one fixture clamping as possible.

[0037] As Figure 5 and 6 shown, the positioning hole 2 is a stepped hole composed of an upper guiding section 21, a middle limiting section 22, a lower TO product pin avoiding section 23, and a bottom TO product pin positioning section 26.

[0038] As Figure 5 shown, the hole of the guiding section 21 is for guiding the placement of the TO product 3. The hole of the guiding section 21 is a tapered hole with a taper of 120° to guide the TO product to enter.

[0039] As Figure 5 shown, the hole of the middle limiting section 22 is a round hole, and the design of the round hole fits the outer shape of the TO product better. The hole of the limiting section 22 is to limit the TO product 3. The minimum inner diameter of the hole of the guiding section 21 is equal to the inner diameter of the hole of the limiting section 22. The limiting part 31 on the circular shell of the TO product 3 is located in the limiting section 22 of the positioning hole 2, and there is a gap between the outer surface of the limiting part 31 and the inner hole wall of the limiting section 22; the design of this gap should neither be too large nor too small. In this embodiment, the preferred gap is about 0.1 mm. The consideration of 0.1 mm is, first, to ensure the free entry of the TO product 3 and not to affect the outer shape of the TO product 3 when it enters and exits freely. Second, it also ensures that the TO product 3 has sufficient contact area with the fixture.

[0040] like Figure 5 As shown, the hole of the TO product pin avoidance section 23 of the lower layer is a round hole, and the hole of the TO product pin avoidance section 23 avoids the pin 34 of the TO product 3. The inner diameter of the TO product pin avoidance section 23 is smaller than the inner diameter of the limiting section 22, and a hole shoulder 25 is formed between the limiting section 22 and the TO product pin avoidance section 23.

[0041] The lower end surface of the round tube shell of the TO product 3 is partially attached to the surface of the hole shoulder 25. The surface of the lower end surface of the round tube shell of the TO product 3 that is attached to the hole shoulder 25 is defined as the limiting surface 32, and the remaining part is the vacuum adsorption surface 33. Figure 11 shown.

[0042] In this embodiment, the clamp achieves a balance between the vacuum adsorption area and the area of ​​the product and the clamp by controlling the size, thereby ensuring that the product is firmly placed while increasing the vacuum adsorption area of ​​the product as much as possible to ensure stable adsorption of the product.

[0043] like Figure 5 As shown, the hole of the bottommost TO product pin positioning section 26 is used to accommodate the pin 34 on the TO product 3 and also to limit the pin 34. The hole of the TO product pin positioning section 26 is rounded to protect the pin 34.

[0044] like Figure 6 As shown, the maximum inner diameter of the TO product pin positioning section 26 is smaller than the inner diameter of the TO product pin avoidance section 23. The TO product pin positioning section 26 accommodates all the pins 34 in a TO product 3, and at least three pin limiting holes 24 are concavely arranged on the hole wall of the TO product pin positioning section 26 for corresponding insertion of three pins 34. The pin limiting hole 24 is a semicircular round hole, and the center line of the pin limiting hole 24 is parallel to the center line of the positioning hole 2.

[0045] like Figure 6 As shown, in this embodiment, the radius of the pin limiting hole 24 is slightly larger than the radius of the pin 31 to be inserted. Because the TO product 3 is originally circular, this fixture starts with the pins of the TO product to control the rotational freedom. The pins are not arranged in a circular array. In this embodiment, at least three pin limiting holes 24 and limiting pins 34 are used to limit the rotational freedom of the TO product 3.

[0046] The fixture uses the pin limiting hole 24 on the hole wall of the TO product pin positioning section 26 to assist in positioning the TO product 3. In the positioning hole 2, a sealing structure composed of three steps in the depth direction ensures vacuum adsorption without air leakage.

[0047] Example 1

[0048] like Figure 7 , 8As shown in , 9, 10, 11 and 12, this embodiment selects a TO product 3 as an example to further describe the scheme of this embodiment.

[0049] like Figure 11 and 12 As shown, the TO product 3 is placed in the positioning hole 2 , and the uppermost surface of the TO product is lower than the surface at the opening of the positioning hole 2 .

[0050] In this embodiment, the diameter of the limiting portion 31 on the circular tube shell of the TO product 3 is 5.31 mm.

[0051] like Figure 11 and 12 As shown, the inner diameter of the limiting section 22 of the middle layer of the positioning hole 2 is 5.51 mm, so that a gap L of 0.1 mm is left between the outer surface of the limiting portion 31 on the circular tube shell of the TO product 3 and the inner hole wall of the limiting section 22 .

[0052] At the same time, the inner diameter size d of the hole of the TO product pin avoidance section 23 located at the lower layer of the positioning hole 2 is 4.4mm. When the TO product 3 is installed in the positioning hole 2, the pin 34 of the TO product 3 is accurately clamped by the pin limit hole 24 on the fixture. The movable clearance of the pin 34 is only (0.25-0.45 / 2=0.025), which controls the rotational freedom of the TO product within the range of 2°, and the camera can easily identify it. Among them, 0.25 is the radius R of the pin limit hole 24, and 0.45 is the diameter of the pin 34 on the TO product 3 inserted into the pin limit hole 24.

[0053] The TO product and the fixture are fitted in a circular manner, avoiding the pin area, and the single-side overlap size 0.46>0.1+0.1 ensures that the product will not fall off from the hole of the limiting section 22 located in the middle layer. The product adsorption surface with a diameter of 4.4mm can ensure stable adsorption of the product and no displacement during the patch and wire bonding process. Among them, 4.4mm is the inner diameter of the hole of the TO product pin avoidance section 23 in the lower layer, that is, the diameter of the vacuum adsorption surface (circular surface).

[0054] In this embodiment, in this fixture, the fitting surface between the TO product 3 and the fixture is an annular surface, and the single-side overlap size of about 0.46 is the difference between the outer diameter and the inner diameter of half of the annular fitting surface. The single-side overlap limit size of about 0.46, minus the placement gap of 0.2, leaves an allowable processing tolerance of 0.2.

[0055] In this embodiment 1, the clamp achieves a balance between the vacuum adsorption area and the area of ​​​​fitting between the product and the clamp through size control, ensuring that the product is firmly placed while increasing the vacuum adsorption area of ​​the product as much as possible to ensure stable product adsorption.

[0056] Those skilled in the art can easily understand that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A precision fixture for TO product packaging, characterized in that, it includes a fixture body (1), and a plurality of positioning holes (2) for fixing TO products are opened on the fixture body (1). The TO product (3) is placed in the positioning hole (2), and the surface of the uppermost end of the TO product is lower than the surface of the orifice of the positioning hole (2); The positioning hole (2) is a stepped hole composed of an upper guiding section (21), a middle limiting section (22), a lower TO product pin avoidance section (23), and a lowermost TO product pin positioning section (26). The inner diameter of the guiding section (21) is equal to the inner diameter of the limiting section (22). The inner diameter of the TO product pin avoidance section (23) is smaller than the inner diameter of the limiting section (22). A hole shoulder (25) is formed between the limiting section (22) and the TO product pin avoidance section (23). The maximum inner diameter of the TO product pin positioning section (26) is smaller than the inner diameter of the TO product pin avoidance section (23). The TO product pin positioning section (26) accommodates all the pins (34) in a TO product (3), and at least three pin limiting holes (24) for three pins (34) to be correspondingly inserted are concavely arranged on the hole wall of the TO product pin positioning section (26). The center lines of the pin limiting holes (24) are parallel to the center line of the positioning hole (2); The limiting part (31) on the circular shell of the TO product (3) is located in the limiting section (22) of the positioning hole (2), and there is a gap between the outer surface of the limiting part (31) and the inner hole wall of the limiting section (22); The lower end surface part of the circular shell of the TO product (3) is attached to the surface of the hole shoulder (25). The surface of the lower end surface of the circular shell of the TO product (3) that is attached to the hole shoulder (25) is defined as the limiting surface (32), and the rest is the vacuum adsorption surface (33); The fixture body (1) is composed of a fixture panel (11) and a surrounding plate (12). The positioning hole (2) is opened on the fixture panel (11). The surrounding plate (12) is vertically arranged on the back of the fixture panel (11) to support the fixture panel (11). The internal space of the surrounding plate (12) serves as a vacuum air path; The hole of the upper guiding section (21) is a tapered hole, and the holes of the middle limiting section (22) and the lower TO product pin avoidance section (23) are both round holes.

2. The precision fixture for TO product packaging according to claim 1, characterized in that, all the positioning holes (2) are distributed in a "well" shape on the fixture panel (11).

3. The precision fixture for TO product packaging according to claim 1, characterized in that, the taper of the hole of the upper guiding section (21) is 120°.

4. The precision fixture for TO product packaging according to claim 1, characterized in that, the orifice of the TO product pin positioning section (26) is rounded.

5. The precision fixture for TO product packaging according to claim 1, characterized in that, the fixture body (1) is made of aluminum alloy material.

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