TWI414220B - Flexible printed circuit - Google Patents

Abstract

The invention discloses a flexible printed circuit board, comprising a body, a plurality of golden fingers and at least one protection layer. The plurality of golden fingers are located on insertion and pull parts and insertion and pull protection parts on the body respectively and the protection layer covers the insertion and pull protection parts. With the protection layer covering the insertion and pull protection parts, the flexible printed circuit board prevents stripping of material and solves the problem of poor current conduction after many times of insert and pull.

Description

Flexible circuit board

The invention relates to a flexible circuit board, in particular to a flexible circuit board which covers the plug protection part with a protective layer and is less prone to material peeling.

Printed circuit boards are circuit products made by printing technology. In the early days, the metal was melted on the surface of the insulating plate to make the desired wiring. In the late 1930s, the fabrication method tended to remove unwanted areas by etching. After the 1960s, epoxy resin substrates were used in large quantities, becoming the main resin substrate for circuit board fabrication. Circuit boards are used in a wide range of applications. Circuit boards are an indispensable component in consumer products such as computers, mobile phones, electric toys, and printers that people see in their daily lives.

The flexible circuit board has the characteristics of softness and flexibility, so it has considerable technical advantages. In particular, the performance of the circuit design in the three-dimensional space, the flexible circuit board provides a wider range of variability and flexibility at the design level. Please refer to FIG. 1 , which is a schematic diagram showing an existing flexible circuit board. The surface of the existing flexible circuit board 1 is provided with gold fingers 11 arranged side by side. The function of the gold finger 11 is to make the thimble fixedly contact, thereby conducting current.

Please refer to FIG. 2 again, which is a schematic diagram showing the material peeling of the gold finger of the existing flexible circuit board. However, in the existing gold finger 11 of the flexible circuit board 1, after the plug-in end of the flexible circuit board 1 is repeatedly inserted and removed, the material peeling often occurs (as indicated by the arrow in the figure), causing poor current conduction, etc. Many of these are missing, and the above is a technical issue that remains to be solved.

In view of the problems of the prior art, the inventors have proposed a flexible circuit board based on years of research and development and many practical experiences, as an implementation and basis for improving the above disadvantages.

According to the above object of the present invention, a flexible circuit board includes a main body, a plurality of gold fingers, and a protective layer. The main body defines an insertion portion and a plug protection portion, and each of the gold fingers is spaced apart. In the main body, each of the gold fingers is located at the insertion portion and the insertion protection portion of the main body, and the protection layer covers the insertion protection portions. The material of each of the gold fingers is copper foil or gold. The material of the protective layer is polyamidamide resin or polystyrene. Each of the plugging portions has a first width, and each of the gold finger portions has a second width, and the second width is equal to or greater than the first width. The protective layer has a lateral edge that is parallel or non-parallel to the leading edge of the body.

According to the above object of the present invention, a flexible circuit board includes a main body, a plurality of gold fingers, and a plurality of protective layers. The main body defines an insertion portion and a plug protection portion, and each of the gold fingers is spaced apart. The gold finger is disposed on the main body, and the insertion and removal protection portion covers the insertion protection protection portion. The material of each of the gold fingers is copper foil or gold. The material of the protective layer is polyamidene resin or polystyrene. Each of the plugging portions has a first width, and each of the gold finger portions has a second width, and the second width is equal to or greater than the first width. The protective layer has a lateral edge that is parallel or non-parallel to the leading edge of the body.

In view of the above, a flexible circuit board according to the present invention may have one or more of the following advantages:

(1) The flexible circuit board can improve the peeling of the material by covering the insertion and removal protection portion with a protective layer.

(2) The flexible circuit board can solve the problem of poor current conduction by covering the plug protection portion with a protective layer.

For a better understanding and understanding of the technical features and the efficacies of the present invention, the preferred embodiments and the detailed description are as follows.

1‧‧‧Soft circuit board

11‧‧‧Gold Fingers

2‧‧‧ Subject

21‧‧‧Gold Fingers

211‧‧‧plugging department

212‧‧‧Plug and Protection Department

22‧‧‧Protective layer

221‧‧‧ transverse side

23‧‧‧ Leading edge

A‧‧‧first width

B‧‧‧second width

X-X‧‧‧ hatching

1 is a schematic diagram of a conventional flexible circuit board; and FIG. 2 is a schematic diagram of material peeling of a gold finger of a conventional flexible circuit board; 3 is a top plan view of a first preferred embodiment of a flexible circuit board of the present invention; and FIG. 4 is a side cross-sectional view of a first preferred embodiment of the flexible circuit board of the present invention; A top view of a second preferred embodiment of the flexible circuit board of the present invention; FIG. 6 is a top plan view of a third preferred embodiment of the flexible circuit board of the present invention; and FIG. 7 is a flexible circuit of the present invention. A top view of a fourth preferred embodiment of the board; and FIG. 8 is a top plan view of a fifth preferred embodiment of the flexible circuit board of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, the preferred embodiments of the present invention will be described with reference to the accompanying drawings.

First, please refer to FIG. 3 and FIG. 4 together, which are respectively a top view and a side cross-sectional view of a first preferred embodiment of the flexible circuit board of the present invention. Fig. 4 is a cross-sectional view taken along line X-X of Fig. 3. A first preferred embodiment of the flexible circuit board of the present invention includes a body 2, a plurality of gold fingers 21, and a protective layer 22. The gold fingers 21 are spaced apart from each other on at least one surface of the body 2. The surface of the main body 2 defines an insertion portion 211 and a plug protection portion 212. The main body 2 further includes at least one substrate (not shown), and the material of the substrate is, for example, a polyester resin or a polyamidamide. Resin. The material of each of the gold fingers 21 is made of metal, such as copper foil or gold. Each of the gold finger 21 is located at the insertion portion 211 of the main body 2 and the insertion and removal protection portion 212. The insertion protection portion 212 is located near a front edge 23 of the main body 2, and each of the insertion protection portions 212 has a first Width A. Each of the gold fingers 21 has a second width B, and the second width B is equal to the first width A. The protective layer 22 covers the plug protection portions 212. The protective layer 22 has a lateral edge 221 that is parallel to the leading edge 23 of the body 2. The material of the protective layer 22 is, for example, a polyimide resin or polystyrene.

Please refer to FIG. 5 again, which is a top plan view showing a second preferred embodiment of the flexible circuit board of the present invention. A second preferred embodiment of the flexible circuit board of the present invention includes a body 2, a plurality of gold fingers 21, and a protective layer 22. Each of the gold fingers 21 is disposed at least on a surface of the main body 2 at intervals An insertion portion 211 and a plug protection portion 212 are defined on the surface. Each of the gold fingers 21 is located at the insertion and extraction portion 211 of the main body 2 and the insertion and removal protection portion 212 . The insertion and removal protection portion 212 is located near the front edge 23 of the main body 2 . The protective layer 22 covers the plug protection portions 212. The difference from the foregoing first preferred embodiment is that the second width B is greater than the first width A.

Please refer to FIG. 6 again, which is a schematic top view of a third preferred embodiment of the flexible circuit board of the present invention. A third preferred embodiment of the flexible circuit board of the present invention includes a body 2, a plurality of gold fingers 21, and a protective layer 22. The gold fingers 21 are spaced apart from each other on at least one surface of the main body 2, and at least one surface of the main body 2 defines an insertion portion 211 and a plug protection portion 212. Each of the gold fingers 21 is located at the insertion portion 211 of the main body 2 and the insertion protection portion 212 . The insertion protection portion 212 is located near a front edge 23 of the main body 2 . The protective layer 22 covers the plug protection portions 212 , and the protective layer 22 has a lateral edge 221 . The difference from the foregoing first preferred embodiment is that the lateral edge 221 and the leading edge 23 of the body 2 are not parallel.

Referring to FIG. 7, a schematic top view of a fourth preferred embodiment of the flexible circuit board of the present invention is shown. A fourth preferred embodiment of the flexible circuit board of the present invention includes a body 2, a plurality of gold fingers 21, and a plurality of protective layers 22. The gold fingers 21 are spaced apart from each other on at least one surface of the main body 2, and at least one surface of the main body 2 defines an insertion portion 211 and a plug protection portion 212. Each of the gold fingers 21 is located at the insertion portion 211 of the main body 2 and the insertion protection portion 212 . The insertion protection portion 212 is located near a front edge 23 of the main body 2 . The difference from the first preferred embodiment is that each of the protective layers 23 covers the plug protection portions 212 and the gold fingers 21 are different from the plug protection portions 212. Each of the protective layers 22 has a lateral side 221. Each of the lateral sides 221 is parallel to the leading edge 23 of the body.

Please refer to FIG. 8 again, which is a schematic top view of a fifth preferred embodiment of the flexible circuit board of the present invention. A fifth preferred embodiment of the flexible circuit board of the present invention includes a body 2, a plurality of gold fingers 21, and a plurality of protective layers 22. The gold fingers 21 are spaced apart from each other on at least one surface of the main body 2, and at least one surface of the main body 2 defines an insertion portion 211 and a plug protection portion 212. Each of the gold fingers 21 is located at the insertion and removal portion 211 of the main body 2 and the insertion and removal protection portion 212 . The insertion and removal protection portion 212 is located adjacent to the main body 2 . A leading edge 23 points. Each of the protective layers 22 covers the plug protection portions 212 and the gold fingers 21 different from the plug protection portions 212. Each of the protective layers 22 has a lateral side 221. The difference from the foregoing fourth preferred embodiment is that each of the lateral sides 221 and the leading edge 23 of the main body 2 are not parallel.

In the third preferred embodiment, the fourth preferred embodiment, and the fifth preferred embodiment of the foregoing flexible circuit board of the present invention, the second width B is equal to or greater than the first width A.

It should be noted that in the second to fifth preferred embodiments of the flexible circuit board of the present invention, the material of each of the gold fingers 21 is metal, such as copper foil or gold. And the material of the protective layer is, for example, polyamidamide resin or polystyrene.

It should be further noted that in the first to fifth preferred embodiments of the flexible circuit board of the present invention, the main body 2 includes at least a substrate and an adhesive layer. Since the structure of the main body 2 is not the main point of the present invention, Those skilled in the art who are familiar with the present invention can easily understand it, and thus will not be described again.

It should be particularly noted that the first to fifth preferred embodiments of the flexible circuit board of the present invention are exemplified by a flexible circuit board having a gold finger 21 on one side, but the flexible circuit board of the present invention may also have gold on both sides. The flexible circuit board of the finger 21 is merely an example but not limited.

It should be further noted that the thickness of the aforementioned gold finger 21 is determined by the design requirements, and since it is not the gist of the present invention, it will not be repeated here.

It should be noted that the flexible circuit board of the present invention can be further equipped with components such as a reinforcing plate or a light shielding plate. Since it is not the gist of the present invention, it will not be described herein.

In summary, the flexible circuit board of the present invention has at least the following advantages: the present invention covers the plug protection portions 212 with the protective layer 22, so that the flexible circuit board of the present invention is difficult to generate materials after being inserted and removed multiple times. The situation of peeling off has improved many defects such as poor current conduction.

The above is intended to be illustrative only and not limiting. Any departure from the spirit and scope of the present invention Equivalent modifications or changes made by them shall be included in the scope of the appended patent application.

2‧‧‧ Subject

21‧‧‧Gold Fingers

211‧‧‧plugging department

212‧‧‧Plug and Protection Department

22‧‧‧Protective layer

221‧‧‧ transverse side

23‧‧‧ Leading edge

A‧‧‧first width

B‧‧‧second width

X-X‧‧‧ hatching

Claims (12)

A flexible circuit board includes: a main body defining an insertion portion and a plug protection portion; a plurality of gold fingers, wherein the gold fingers are made of metal, and each of the gold fingers is spaced apart from the At least one surface of the main body, and each of the gold fingers is located at the insertion portion of the main body and the insertion protection portion, the insertion protection portion is located near a front edge of the main body; and a protective layer is located close to The leading edge of the body covers and covers the plug protection portions. The flexible circuit board of claim 1, wherein the material of the gold finger is copper foil or gold. The flexible circuit board of claim 1, wherein the protective layer is made of polyamido resin or polystyrene. The flexible circuit board of claim 1, wherein each of the plugging portions has a first width, and each of the gold finger systems has a second width, and the second width is equal to or greater than the first a width. The flexible circuit board of claim 1, wherein the protective layer has a lateral edge that is parallel to the leading edge of the body. The flexible circuit board of claim 1, wherein the protective layer has a lateral edge that is non-parallel to the leading edge of the body. A flexible circuit board includes: a main body defining an insertion portion and a plug protection portion; a plurality of gold fingers, wherein the gold fingers are made of metal, and each of the gold fingers is spaced apart from the At least one surface of the main body, and each of the gold finger is located at the insertion portion of the main body and the insertion protection portion, the insertion protection portion is located near a front edge of the main body; and a plurality of protective layers, each The protective layer covers the plug protection portions and the surface of the portion covering the gold fingers and exposes the surface of the other portion of the gold fingers. The flexible circuit board of claim 7, wherein the material of the gold finger is copper foil or gold. The flexible circuit board of claim 7, wherein the protective layer is made of polyamido resin or polystyrene. The flexible circuit board of claim 7, wherein each of the insertion portions has a first width, and each of the gold fingers has a second width, and the second width is equal to or greater than the first width. . The flexible circuit board of claim 7, wherein the protective layer has a lateral edge that is parallel to the leading edge of the body. The flexible circuit board of claim 7, wherein the protective layer has a lateral edge that is non-parallel to the leading edge of the body.