CN202841718U - Positioning fixture for thin type PCB - Google Patents
Positioning fixture for thin type PCB Download PDFInfo
- Publication number
- CN202841718U CN202841718U CN201220432583.1U CN201220432583U CN202841718U CN 202841718 U CN202841718 U CN 202841718U CN 201220432583 U CN201220432583 U CN 201220432583U CN 202841718 U CN202841718 U CN 202841718U
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- China
- Prior art keywords
- pcb board
- extension spring
- main body
- plate
- positioning fixture
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
Provided is a positioning fixture for a thin type PCB. The positioning fixture comprises a plate-shaped framework main body, a PCB positioning plane and at least four pulling positioning members. The PCB positioning plane, corresponding to the PCB, is arranged on the upper surface of the plate-shaped framework main body in a protruding manner, and the area of the PCB positioning plane is equal to or larger than the surface area of the PCB plate. The four pulling positioning members at least act on four endpoints of the PCB respectively, and other ends of the positioning members act on the plate-shaped framework main body. With the abovementioned structural design, the positioning fixture, compared with the prior art, not only meets requirements of the thin type PCB for flatness, but also solves a problem that the thin type PCB is easy to deform under a thermal stress in the mounting process.
Description
Technical field
The utility model relates to a kind of anchor clamps of pcb board, is specifically related to a kind of positioning fixture for slim pcb board.
Background technology
Along with design of electronic products towards densification, miniaturization and highly integrated trend development, surface mounting technology becomes the mode of main flow in the present electronic devices and components mounting technique gradually, and the structure of pcb board is also further short and small frivolous.
Surface mounting technology mainly comprises the operations such as paste solder printing, device placement, reflow soldering.Wherein, paste solder printing refers to the steel mesh of tin cream by default figure the tin cream corresponding pad locations on the pcb board of biting; Device is put on the pad that the pin refer to electronic devices and components is positioned over the pcb board of printed tin cream; Reflow soldering refers to the tin cream fusing so that realize machinery and electrical connection between the pad of electronic devices and components pin and pcb board.The paste solder printing of surface mounting technology, device placement location have very high required precision, in case the processing of these links processing is accurate not, all will directly cause the decline of surface mount yields.
Present surface mount production line all is to mount the production equipment that designs for satisfying hardboard, so slim pcb board is when using present surface-mounting equipment to produce, warpage appears in the PCB circuit board in the process in order to prevent from mounting, guarantee the accuracy of paste solder printing figure and device storing position, usually the evenness that guarantees on the framework that it is qualified is pasted or be crimped on to the frame of slim pcb board, and avoid in the process that mounts, deformation occuring, but such method can because the hot expansion and contraction of framework and thin plate is different, cause the generation deformation of pcb board under thermal stress.
Therefore, how to solve the deficiency that above-mentioned prior art exists, just become the problem of the utility model research.
Summary of the invention
The utility model provides a kind of positioning fixture of slim pcb board, and its purpose is to solve slim pcb board easy problem that deformation occurs under thermal stress in the process of mounting.
For achieving the above object, the technical solution adopted in the utility model is: a kind of positioning fixture of slim pcb board, comprise a plate-shaped frame main body, and wherein, also comprise:
One pcb board plane of orientation, corresponding described pcb board is convexly set in the upper surface of described plate-shaped frame main body, and area is more than or equal to the surface area of described pcb board;
At least four tractive keepers act at least respectively four end points of described pcb board, and the other end of tractive keeper then acts on the plate-shaped frame main body.
Related content in the technique scheme is explained as follows:
1. in the such scheme, described " the corresponding described pcb board of pcb board plane of orientation is convexly set in the upper surface of described plate-shaped frame main body ", so that described pcb board can have with the upper surface of described plate-shaped frame main body a difference in height, and by this difference in height, so that described tractive keeper can outwards produce level and two power vertically downward to the end points of pcb board, wherein, the outside power of level can make pcb board nature Uniform Tension, and power vertically downward can make pcb board and pcb board plane of orientation fit tightly.
2. in the such scheme, described " at least four tractive keepers; act at least respectively four end points of described pcb board " are so that each one of described pcb board is stressed evenly, specifically comprise following two kinds of situations: one, when the quantity of tractive keeper equals four, then each tractive keeper acts on respectively four end points of pcb board; Two, when the quantity of tractive keeper greater than four the time, then except four tractive keepers wherein act on respectively four end points of pcb board, other tractive keeper is equidistant to be acted on the outer rim of pcb board.
3. in the such scheme, described tractive keeper is selected certainly: extension spring, elastic threads, metal wire.
4. in the such scheme, described tractive keeper is specially an extension spring, and an end of this extension spring is positioned an end points of described pcb board, and the other end of extension spring is positioned on the described plate-shaped frame main body.Select the reason of extension spring to be: extension spring is an elastic component, so can produce a constant active force to pcb board.
5. in the such scheme, four end points of described pcb board all offer through hole, and an end of described extension spring is by this through hole and pcb board location.
6. in the such scheme, corresponding described through hole also is provided with a fixed body, this fixed body is comprised of thin slice and the retainer ring of an area greater than the through hole orifice area, and the height of this retainer ring is greater than the thickness of described pcb board, and an end of described extension spring is by acting on this retainer ring to locate described pcb board; The corresponding described extension spring of described pcb board plane of orientation extremely offers the conduit identical with extension spring quantity with the junction of described plate-shaped frame main body from the below of described pcb board through hole, so that described extension spring can be wherein accommodating.
The utility model operation principle and advantage are as follows:
The positioning fixture of a kind of slim pcb board of the utility model comprises a plate-shaped frame main body, a pcb board plane of orientation and at least four tractive keepers; Wherein, the corresponding described pcb board of described pcb board plane of orientation is convexly set in the upper surface of described plate-shaped frame main body, and area is more than or equal to the surface area of described pcb board; Described at least four tractive keepers act at least respectively four end points of described pcb board, and the other end of tractive keeper then acts on the plate-shaped frame main body; Form design by said structure, so that the structure of the utility model contrast prior art can not only satisfy the evenness requirement of slim pcb board, more can solve slim pcb board easy problem that deformation occurs under thermal stress in the process of mounting.
Description of drawings
Accompanying drawing 1 is the stereogram of the utility model most preferred embodiment;
Accompanying drawing 3 is the cutaway view of the utility model most preferred embodiment;
Accompanying drawing 4 is the local enlarged diagram of Fig. 3.
In the above accompanying drawing: 1. plate-shaped frame main body; 2.PCB plate plane of orientation; 3.PCB plate; 4. extension spring; 5. through hole; 6. fixed body; 7. thin slice; 8. retainer ring; 9. conduit; F. traction force; F1. the outside power of level; F2. vertically downward power.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described:
Embodiment: shown in accompanying drawing 1～3, be the most preferred embodiment of the positioning fixture of a kind of slim pcb board of the utility model, this positioning fixture comprises:
One plate-shaped frame main body 1, a pcb board plane of orientation 2, four tractive keepers; Wherein:
Described pcb board plane of orientation 2 corresponding described pcb boards 3 are convexly set in the upper surface of described plate-shaped frame main body 1, so that described pcb board 3 can have with the upper surface of described plate-shaped frame main body 1 difference in height (specifically seeing Fig. 3,4), and by this difference in height, so that described tractive keeper can resolve into the outside power F1 of level and power F2 vertically downward to the traction force F of the end points of pcb board 3, wherein, the outside power F1 of level can make pcb board 3 natural Uniform Tensions, and power F2 vertically downward can make pcb board 3 and pcb board plane of orientation 2 fit tightly.In addition, the area of this pcb board plane of orientation 2 is more than or equal to the surface area of described pcb board 3;
Described tractive keeper is specially an extension spring 4, and these four extension springs 4 act on respectively four end points of pcb board 3, so that described pcb board 3 each one are stressed evenly, the other end of extension spring 4 then acts on the plate-shaped frame main body 1.Wherein, the quantity of extension spring 4 can be greater than four, and then except four extension springs 4 wherein act on respectively four end points of pcb board 3, other extension spring 4 is equidistant to be acted on the outer rim of pcb board 3 (for accompanying drawing shows).Because extension spring 4 is an elastic component, so can produce a constant active force to pcb board 3;
Wherein, four end points of described pcb board 3 all offer through hole 5, and corresponding described through hole 5 also is provided with a fixed body 6, this fixed body 6 is comprised of thin slice 7 and the retainer ring 8 of an area greater than through hole 5 orifice area, the height of this retainer ring 8 is greater than the thickness of described pcb board 3, and an end of described extension spring 4 is by acting on this retainer ring 8 to locate described pcb board 3; Described pcb board plane of orientation 2 corresponding described extension springs 4 extremely offer the conduit 9 identical with extension spring 4 quantity with the junction of described plate-shaped frame main body 1 from the below at described pcb board 3 through holes 5 places, so that described extension spring 4 can be wherein accommodating.
The positioning fixture of a kind of slim pcb board of the utility model comprises a plate-shaped frame main body, a pcb board plane of orientation and at least four tractive keepers; Wherein, the corresponding described pcb board of described pcb board plane of orientation is convexly set in the upper surface of described plate-shaped frame main body, and area is more than or equal to the surface area of described pcb board; Described at least four tractive keepers act at least respectively four end points of described pcb board, and the other end of tractive keeper then acts on the plate-shaped frame main body; Form design by said structure, so that the structure of the utility model contrast prior art can not only satisfy the evenness requirement of slim pcb board, more can solve slim pcb board easy problem that deformation occurs under thermal stress in the process of mounting.
Above-described embodiment only is explanation technical conceive of the present utility model and characteristics, and its purpose is to allow the personage who is familiar with technique can understand content of the present utility model and according to this enforcement, can not limit protection range of the present utility model with this.All equivalences of doing according to the utility model Spirit Essence change or modify, and all should be encompassed within the protection range of the present utility model.
Claims (5)
1. the positioning fixture of a slim pcb board comprises a plate-shaped frame main body, it is characterized in that: also comprise:
One pcb board plane of orientation, corresponding described pcb board is convexly set in the upper surface of described plate-shaped frame main body, and area is more than or equal to the surface area of described pcb board;
At least four tractive keepers act at least respectively four end points of described pcb board, and the other end of tractive keeper then acts on the plate-shaped frame main body.
2. positioning fixture according to claim 1 is characterized in that: described tractive keeper is selected from extension spring, elastic threads, metal wire.
3. positioning fixture according to claim 1 and 2, it is characterized in that: described tractive keeper is specially an extension spring, and an end of this extension spring is positioned an end points of described pcb board, and the other end of extension spring is positioned on the described plate-shaped frame main body.
4. positioning fixture according to claim 3, it is characterized in that: four end points of described pcb board all offer through hole, and an end of described extension spring is located by this through hole and pcb board.
5. positioning fixture according to claim 4, it is characterized in that: corresponding described through hole also is provided with a fixed body, this fixed body is comprised of thin slice and the retainer ring of an area greater than the through hole orifice area, the height of this retainer ring is greater than the thickness of described pcb board, and an end of described extension spring is by acting on this retainer ring to locate described pcb board; The corresponding described extension spring of described pcb board plane of orientation extremely offers the conduit identical with extension spring quantity with the junction of described plate-shaped frame main body from the below of described pcb board through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220432583.1U CN202841718U (en) | 2012-08-29 | 2012-08-29 | Positioning fixture for thin type PCB |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220432583.1U CN202841718U (en) | 2012-08-29 | 2012-08-29 | Positioning fixture for thin type PCB |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202841718U true CN202841718U (en) | 2013-03-27 |
Family
ID=47953303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220432583.1U Expired - Lifetime CN202841718U (en) | 2012-08-29 | 2012-08-29 | Positioning fixture for thin type PCB |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202841718U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103144445A (en) * | 2013-04-03 | 2013-06-12 | 珠海天威飞马打印耗材有限公司 | Printing template |
-
2012
- 2012-08-29 CN CN201220432583.1U patent/CN202841718U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103144445A (en) * | 2013-04-03 | 2013-06-12 | 珠海天威飞马打印耗材有限公司 | Printing template |
| CN103144445B (en) * | 2013-04-03 | 2015-11-18 | 珠海天威飞马打印耗材有限公司 | Printing template |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130327 |