Flexible circuit board film sheet anti-deviation structure

Abstract

The utility model discloses a kind of flexible circuit board diaphragm anti-deviation structures, including substrate diaphragm, first positioning hole and second positioning waist-shaped hole are equipped with on it interval;The positioning hole and second positioning waist-shaped hole are used to cooperate with the positioning column on machine table to prevent substrate diaphragm deviation.The utility model discloses flexible circuit board diaphragm anti-deviation structure, by the structure of substrate diaphragm and first positioning hole and second positioning waist-shaped hole combination cooperates with the positioning column on machine table to prevent substrate diaphragm deviation.This ensures the interlayer alignment accuracy when circuit layer prints, effectively solve the problem that substrate diaphragm is slightly expanded due to hygroscopic after being pre-shrunk and stored, its positioning hole and machine table positioning column cannot match.

Description

Technical Field

[0001] This utility model relates to the field of flexible circuit board technology, and in particular to a flexible circuit board diaphragm anti-displacement structure. Background Technology

[0002] In the manufacturing of double-layer or multi-layer flexible printed circuit boards (FPCs), preventing misalignment of circuit layers is crucial for achieving high yield and reliability. Printing misalignment can lead to a series of serious problems such as short circuits, open circuits, and unstable impedance. Therefore, the existing solution is to set two spaced positioning posts on the machine tool; then, positioning through holes corresponding to the positions of the positioning posts are made on the flexible diaphragm. The positioning through holes and positioning posts work together to prevent the flexible diaphragm from shifting position.

[0003] Before printing circuit layers, flexible films (i.e., flexible substrates) need to undergo pre-shrinking to release residual stress and remove absorbed moisture. This pre-shrinking process makes the dimensions of the flexible film more predictable in subsequent processing, which is crucial for double-layer and multi-layer FPCs requiring extremely high interlayer alignment accuracy. In actual production, to improve efficiency, large batches of flexible films are typically pre-drilled for positioning. After unused flexible films are stored for a period, slight expansion due to storage environment and other factors can cause changes in the spacing between the two positioning holes. Directly discarding them would be wasteful; however, if used directly, the changed spacing between the two positioning holes leads to a mismatch with the positioning posts on the printing machine. Even if pressed down, this can cause localized arching of the film, affecting the printing quality of the circuit layers. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a flexible circuit board diaphragm anti-misalignment structure, comprising: A substrate film, on which a first positioning hole and a second positioning waist-shaped hole are provided at intervals; The positioning hole and the second positioning waist-shaped hole are used to cooperate with the positioning post on the machine to prevent the substrate film from shifting.

[0005] Preferably, the first positioning hole is one of a round hole, a square hole, or a diamond-shaped hole.

[0006] Preferably, the second positioning waist-shaped hole is an elliptical hole or a rectangular hole.

[0007] Preferably, the first positioning hole and the second positioning waist-shaped hole are located at the edge of the substrate film.

[0008] The flexible circuit board film anti-misalignment structure provided by this utility model uses a structure combining the substrate film with the first positioning hole and the second positioning waist-shaped hole to cooperate with the positioning post on the machine to prevent the substrate film from shifting. This ensures the interlayer alignment accuracy during circuit layer printing and effectively solves the problem that the positioning hole of the substrate film, which has slightly expanded due to moisture absorption after pre-shrinking and storage, cannot match the positioning post of the machine. Attached Figure Description

[0009] Figure 1 A schematic diagram of the anti-displacement structure of the circuit board diaphragm provided in an embodiment of this utility model; Wherein: 10, substrate film; 11, first positioning hole; 12, second positioning waist-shaped hole. Detailed Implementation

[0010] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model is further described below in conjunction with specific embodiments. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of this utility model. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods. Unless otherwise specified, the materials and reagents used in the following embodiments can be obtained commercially.

[0011] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0012] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" 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 a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0013] This utility model provides a flexible circuit board diaphragm anti-displacement structure, including: The substrate film 10 has a first positioning hole 11 and a second positioning waist-shaped hole 12 spaced apart thereon; The positioning hole 11 and the second positioning waist-shaped hole 12 are used to cooperate with the positioning post on the machine to prevent the substrate film 10 from shifting.

[0014] In specific implementation, such as Figure 1 As shown, the flexible circuit board diaphragm anti-displacement structure includes a substrate diaphragm 10, on which a first positioning hole 11 and a second positioning oblong hole 12 are provided at intervals; wherein, the first positioning hole 11 is, but is not limited to, a round hole, a square hole, or a diamond-shaped hole; the second positioning oblong hole 12 is an elliptical hole or a rectangular hole, etc. During printing, the substrate film 10 is placed on the machine platform, and the first positioning hole 11 and the second positioning waist-shaped hole 12 are aligned with the positions of the two positioning posts on the machine platform. The positioning hole 11 and the second positioning waist-shaped hole 12 are used to cooperate with the positioning posts on the machine platform to prevent the substrate film 10 from shifting. The positioning posts include, but are not limited to, cylindrical structures. The groove structure of the second positioning waist-shaped hole 12 provides a larger tolerance space in its length direction. When the substrate film 10 expands slightly, causing the hole spacing to increase, the positioning post can still be smoothly inserted into the groove and move within a limited range. This allows the direct use of films that have slightly changed in size due to storage without the need for time-consuming and laborious secondary pre-shrinking treatment, avoiding material waste caused by direct discarding, significantly reducing production costs and improving the efficiency and flexibility of the production process.

[0015] The flexible circuit board film anti-misalignment structure provided in this embodiment of the utility model uses a circular hole (first positioning hole 11) for main positioning, and another slot (second positioning waist-shaped hole 12) to provide effective anti-misalignment function even when the distance between the two positioning holes changes. This ensures the interlayer alignment accuracy during circuit layer printing and effectively solves the problem that the positioning holes of the substrate film, which has slightly expanded due to moisture absorption after pre-shrinking and storage, cannot match the positioning posts of the machine.

[0016] In actual production, due to the large distance between the two positioning holes, long-term storage after pre-shrinking has a significant impact on the distance between the positioning holes. The diameter of the positioning holes is small, and the deformation of the positioning holes themselves is very small and negligible.

[0017] Preferably, the first positioning hole 11 has the same shape as the positioning post on the machine base; the area of ​​the second positioning waist-shaped hole 12 in the projection direction is larger than the area of ​​the positioning post on the machine base, so as to provide reserved space for the diaphragm to pass through after deformation.

[0018] Preferred, such as Figure 1As shown, the first positioning hole 11 and the second positioning waist-shaped hole 12 are located on one side of the edge of the substrate film 10. In this embodiment, the alignment of the positioning hole with the positioning post on the machine can be easily observed at the edge, making the positioning and installation operations smoother and more convenient.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flexible circuit board diaphragm anti-misalignment structure, characterized in that, include: The substrate film (10) has a first positioning hole (11) and a second positioning waist-shaped hole (12) spaced apart thereon. The positioning hole (11) and the second positioning waist-shaped hole (12) are used to cooperate with the positioning post on the machine to prevent the substrate film (10) from shifting.

2. The flex circuit board film decentering prevention structure of claim 1, wherein: The first positioning hole (11) is one of a round hole, a square hole, or a diamond hole.

3. The flexible circuit board diaphragm anti-misalignment structure according to claim 1 or 2, characterized in that: The second positioning waist-shaped hole (12) is an elliptical hole or a rectangular hole.

4. The flexible circuit board diaphragm anti-misalignment structure according to claim 1, characterized in that: The first positioning hole (11) and the second positioning waist-shaped hole (12) are located at the edge of the substrate film (10).

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