A flexible printed circuit board

Abstract

This utility model discloses a flexible printed circuit board, including a thin-film flexible board. The thin-film flexible board is rectangular in shape, with a first connector at its left end and a second connector at its right end. Multiple first conductive strips are evenly spaced on the upper surface of the first connector, and multiple second conductive strips are evenly spaced on the upper surface of the second connector. Multiple wires are arranged along the length of the thin-film flexible board inside the board. The left ends of the multiple wires are respectively connected to the first conductive strips. In this utility model, odd-numbered and even-numbered through holes are staggered along the length of the thin-film flexible board, ensuring the structural strength of the board along its length. Furthermore, the four inner corners of the through holes are rounded, making the thin-film flexible board less prone to tearing at the corners of the through holes. The stress is also released promptly when the thin-film flexible board is in a bent state for extended periods.

Description

Technical Field

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[0001] The utility model relates to the technical field of circuit boards, and particularly relates to a flexible printed circuit board. Background Art

[0002] A flexible printed circuit board (abbreviated as FPC) is a highly reliable and extremely flexible printed circuit board made of polyimide or polyester film. It has the characteristics of high wiring density, light weight, thin thickness, and good bending property; one of the main functions of the flexible printed circuit board is to connect two rigid circuit boards with a certain distance, so that signals or currents can be freely transmitted between the two rigid circuit boards; during use, the flexible printed circuit board is often in a specific bending posture. As the flexible printed circuit board is used for a long time, more stress will accumulate at the bending position. After a long time, the flexible printed circuit board is likely to break at the bending position, resulting in damage to the flexible printed circuit board.

[0003] In view of the above problems, the present utility model is proposed. Content of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present utility model is to provide a flexible printed circuit board to solve the problems mentioned in the background art.

[0005] To solve the above technical problems, the present utility model provides the following technical solutions.

[0006] The present utility model provides a flexible printed circuit board, including a thin film flexible board. The thin film flexible board is in the shape of a long rectangular strip. A first plug connector is provided at the left end of the thin film flexible board, and a second plug connector is provided at the right end of the thin film flexible board;

[0007] On the upper surface of the first plug connector, a plurality of first conductive strips are uniformly arranged at equal intervals. On the upper surface of the second plug connector, a plurality of second conductive strips are uniformly arranged at equal intervals. A plurality of wires are arranged inside the thin film flexible board along the length direction of the thin film flexible board;

[0008] The left ends of the plurality of wires are respectively connected to the first conductive strips, the right ends of the plurality of wires are respectively connected to the second conductive strips, and odd-ranked through holes and even-ranked through holes are arranged at intervals from left to right on the surface of the thin film flexible board;

[0009] The positions of the wires close to the odd-ranked through holes and the even-ranked through holes are both in a bent trend. The bent trend positions of the wires are in a "匚" shape, and notch openings are formed at the bent trend positions of the wires.

[0010] Preferably, the odd-numbered through holes have three individual through holes in the width direction of the flexible film, and the even-numbered through holes have two individual through holes in the width direction of the flexible film, with the odd-numbered and even-numbered through holes in adjacent positions being staggered.

[0011] Preferably, the individual through hole is rhomboid in shape, with all four interior corners of the individual through hole being rounded, one diagonal of the individual through hole being perpendicular to the length direction of the flexible film, and the other diagonal of the individual through hole being parallel to the length direction of the flexible film.

[0012] Preferably, the diagonal of the individual through-hole perpendicular to the length direction of the flexible film is longer than the diagonal of the individual through-hole parallel to the length direction of the flexible film.

[0013] Preferably, the diagonal of the individual through-hole perpendicular to the length direction of the flexible film is four to five times the diagonal of the individual through-hole parallel to the length direction of the flexible film.

[0014] Preferably, the axis of symmetry of the odd-numbered through holes parallel to the length direction of the flexible film coincides with the axis of symmetry of the even-numbered through holes parallel to the length direction of the flexible film.

[0015] Preferably, the notch is positioned at the upper and lower corners of the odd-numbered and even-numbered through holes.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The first connector can be connected to a rigid circuit board, and the second connector can be connected to another rigid circuit board. Signals can be transmitted between the two rigid circuit boards through the first conductive strip, the wire, and the second conductive strip.

[0018] When the flexible film is bent upward or downward along its length, the odd-numbered and even-numbered through holes can widen or narrow with the bending angle. The stress generated inside the flexible film at the bending point can be released in the odd-numbered and even-numbered through holes, eliminating creases at the bending position.

[0019] Odd-numbered and even-numbered through holes are staggered along the length of the flexible film, which can ensure the internal structural strength of the flexible film in the length direction. In addition, the four inner corners of the through holes are rounded, making the flexible film less prone to tearing at the corners of the through holes.

[0020] When the flexible film is in a bent state for a long time, the stress is released in time, and it is not easy to crease at the bent position. It is also not easy to break over time, resulting in a longer service life and less damage. Attached Figure Description

[0021] Figure 1 This is a perspective view of the flexible thin-film sheet of this utility model;

[0022] Figure 2 This is a three-dimensional view of the conductor of this utility model;

[0023] Figure 3 This is a three-dimensional view of the odd-numbered through holes of this utility model.

[0024] In the figure: 1. Thin film flexible board; 11. Odd-numbered through holes; 12. Even-numbered through holes; 2. First connector; 21. First conductive strip; 3. Second connector; 31. Second conductive strip; 4. Wire; 41. Notch. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0027] like Figure 1-3 As shown, a flexible printed circuit board includes a thin film flexible board 1, which is a long rectangular strip. A first connector 2 is provided at the left end of the thin film flexible board 1, and a second connector 3 is provided at the right end of the thin film flexible board 1. The first connector 2 can connect to a rigid circuit board, and the second connector 3 can connect to another rigid circuit board.

[0028] The upper surface of the first connector 2 is provided with a plurality of first conductive strips 21 at equal intervals, the upper surface of the second connector 3 is provided with a plurality of second conductive strips 31 at equal intervals, and the interior of the thin film flexible board 1 is provided with a plurality of wires 4 along the length direction of the thin film flexible board 1.

[0029] The left ends of multiple wires 4 are respectively connected to the first conductive strip 21, and the right ends of multiple wires 4 are respectively connected to the second conductive strip 21. Signals inside the first conductive strip 21, wires 4 and second conductive strip 31 can be transmitted freely. The surface of the thin film flexible board 1 is provided with odd-numbered through holes 11 and even-numbered through holes 12 from left to right.

[0030] The wire 4 is bent near the through-holes 11 in odd positions and the through-holes 12 in even positions. The bent positions of the wire 4 are in a "C" shape, and a notch 41 is formed at the bent positions of the wire 4, so that the wire 4 can be completely located in the flexible film 1 and will not be exposed at the through-holes 11 in odd positions and the through-holes 12 in even positions.

[0031] There are three separate through-holes for the through-holes 11 in odd positions in the width direction of the flexible film 1, and there are two separate through-holes for the through-holes 11 in even positions in the width direction of the flexible film 1. The through-holes 11 in odd positions and the through-holes 12 in even positions at adjacent positions are staggered.

[0032] The separate through-holes are diamond-shaped, and the four inner corners of the separate through-holes are all arc-shaped, so that the flexible film 1 will not be torn. One diagonal of the separate through-hole is perpendicular to the length direction of the flexible film 1, and the other diagonal of the separate through-hole is parallel to the length direction of the flexible film

[0033] The diagonal of the separate through-hole perpendicular to the length direction of the flexible film 1 is longer than the diagonal of the separate through-hole parallel to the length direction of the flexible film 1.

[0034] The diagonal of the separate through-hole perpendicular to the length direction of the flexible film is four to five times the diagonal of the separate through-hole parallel to the length direction of the flexible film 1; that is, the shape of the separate through-hole is narrow and long.

[0035] The symmetry axis of the through-holes 11 in odd positions parallel to the length direction of the flexible film 1 coincides with the symmetry axis of the through-holes 12 in even positions parallel to the length direction of the flexible film 1.

[0036] The notch 41 faces the upper corner positions and the lower corner positions of the through-holes 11 in odd positions and the through-holes

[0037] To sum up: The first plug connector 2 can be connected to a rigid circuit board, the second plug connector 3 can be connected to another rigid circuit board, and signals can be transmitted between the two rigid circuit boards through the first conductive strip 21, the wire 4 and the second conductive strip 31;

[0038] When the flexible film 1 is bent upward or downward in its length direction, the through-holes 11 in odd positions and the through-holes 12 in even positions can become wider or narrower as the bending angle changes, so that the stress generated inside the flexible film 1 at the bending position can be released at the through-holes 11 in odd positions and the through-holes 12 in even positions, thus eliminating the creases at the bending positions;

[0039] The through-holes 11 in odd positions and the through-holes 12 in even positions are staggered in the length direction of the flexible film 1, which can ensure the internal structural strength of the flexible film 1 in the length direction, and the four inner corners of the through-holes are all arc-shaped, so that the flexible film 1 is not easily torn at the corner positions of the through-holes;

[0040] When the flexible film 1 is in a bent state for a long time, the stress is released in time, and it is not easy to crease at the bent position. It is also not easy to break over time, resulting in a longer service life and less damage.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A flexible printed circuit board, characterized by: It includes a flexible printed circuit board (1), the flexible printed circuit board (1) is in the shape of a long rectangle, a first plug connector (2) is provided at the left end of the flexible printed circuit board (1), and a second plug connector (3) is provided at the right end of the flexible printed circuit board (1); On the upper surface of the first plug connector (2), a plurality of first conductive strips (21) are evenly arranged at equal intervals, on the upper surface of the second plug connector (3), a plurality of second conductive strips (31) are evenly arranged at equal intervals, and a plurality of wires (4) are arranged inside the flexible printed circuit board (1) along the length direction of the flexible printed circuit board (1); The left ends of the plurality of wires (4) are respectively connected to the first conductive strips (21), the right ends of the plurality of wires (4) are respectively connected to the second conductive strips (31), and odd-rank through holes (11) and even-rank through holes (12) are arranged at intervals from left to right on the surface of the flexible printed circuit board (1); The positions of the wires (4) close to the odd-rank through holes (11) and the even-rank through holes (12) are both bent, the bent positions of the wires (4) are in the shape of "匚", and notch (41) is formed at the bent positions of the wires (4).

2. A flexible printed circuit board as claimed in claim 1, characterized in that: There are three separate through holes in the width direction of the flexible printed circuit board (1) for the odd-rank through holes (11), there are two separate through holes in the width direction of the flexible printed circuit board (1) for the even-rank through holes (12), and the adjacent odd-rank through holes (11) and even-rank through holes (12) are staggered.

3. A flexible printed circuit board as claimed in claim 2, characterised in that: The separate through holes are in the shape of a rhombus, the four inner angles of the separate through holes are all arc-shaped, one diagonal of the separate through hole is perpendicular to the length direction of the flexible printed circuit board (1), and the other diagonal of the separate through hole is parallel to the length direction of the flexible printed circuit board (1).

4. A flexible printed circuit board as claimed in claim 3, wherein: The diagonal of the separate through hole perpendicular to the length direction of the flexible printed circuit board (1) is longer than the diagonal of the separate through hole parallel to the length direction of the flexible printed circuit board (1).

5. A flexible printed circuit board as claimed in claim 3, wherein: The diagonal of the separate through hole perpendicular to the length direction of the flexible printed circuit board is four to five times the diagonal of the separate through hole parallel to the length direction of the flexible printed circuit board (1).

6. A flexible printed circuit board according to claim 1, characterized in that: The symmetry axis of the odd-rank through holes (11) parallel to the length direction of the flexible printed circuit board (1) coincides with the symmetry axis of the even-rank through holes (12) parallel to the length direction of the flexible printed circuit board (1).

7. A flexible printed circuit board as claimed in claim 1, wherein: The notch (41) faces the upper corner positions and the lower corner positions of the odd-rank through holes (s11) and the even-rank through holes (12).

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