JPH0631168U - Flexible printed circuit board - Google Patents

Abstract

(57) [Abstract] [Purpose] When inserting the end of the flexible printed circuit board into the connector, the terminal pattern provided at this end contacts the connector body or the terminal on the connector side,
Prevents pattern peeling. According to the present invention, a base film 1 is protruded by a predetermined amount d from a terminal pattern 3 provided at an end portion of a flexible printed board, and the protruding base film 1 is inserted when the flexible printed board is inserted into a connector 7.
Only the connector 7 is configured to be brought into contact with the main body of the connector 7 or the contact piece 8 which is a terminal on the connector side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flexible printed board used for signal transmission between wiring boards of electronic devices.

[0002]

[Prior art]

 As shown in FIG. 5, a general flexible printed circuit board has a circuit pattern 2 formed on a flexible base film 1 so that the circuit pattern can be connected to another circuit board by a connector. After exposing a part of both ends as the terminal pattern 3, the circuit pattern is covered with the cover film 4, and the lower surface of the base film near the terminal pattern 3 is reinforced by the auxiliary plate 5. The terminal pattern 6 has a structure in which the terminal portion 6 for pushing in the connector is formed by the terminal pattern.

[0003]

[Problems to be solved by the device]

 In the above prior art, since the tip of the terminal pattern reaches the end of the base film, when the terminal part is pushed into the connector, the terminal on the connector side or the connector body contacts the edge of the terminal part. However, there was a fear that the pattern of the terminal pattern would peel off from the base film.

As a measure against this, a method of C-cutting the tip of the exposed portion as shown in FIG. 6 or a method of narrowing the tip width of the pattern of the exposed portion as shown in FIG. The area where the tip is flush with the tip is minimized to prevent the terminal or connector body on the connector side from coming into contact with the tip of the terminal pattern, but in any case pattern peeling is completely prevented. It is impossible to do it, and it takes time and labor to perform cutting and other processing.

[0005]

[Means for Solving the Problems]

 The present invention comprises a base film having a circuit pattern on its upper surface, and a cover film covering the base film so that a part of the circuit pattern is exposed as a terminal pattern. It is characterized in that it is configured so as to project from the front end surface of the device by a predetermined amount.

[0006]

[Action]

 Since the present invention is configured as described above, when the terminal pattern is pushed into the connector, the contact of the terminal on the connector body or the connector side with the end surface of the terminal pattern is suppressed as much as possible, and the terminal pattern is not peeled off. It can be prevented.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The same parts as those in FIG. 5 of the prior art are designated by the same reference numerals and the description thereof will be omitted.

1, 2, and 3 are a perspective view, a plan view, and a side view, respectively, of the flexible printed circuit board of this embodiment. A plurality of conductive patterns 2, 2, ... Are fixed to the flexible base film 1, and the cover film 4 covers the pattern except for the vicinity of the tip of this pattern. In other words, only the vicinity of the tip of the pattern 2 is exposed from the cover film 4 as the terminal patterns 3, 3, .... A reinforcing plate 5 is adhered to the lower surface of the base film 1 near the terminal pattern 2 for reinforcement.

Here, the respective tip surfaces 1a and 5a of the base film 1 and the reinforcing plate 5 have the same surface without steps, but the tip surface 3a of each terminal pattern 3 and the tip surface 1a of the base film 1 are , A step of a predetermined amount d is provided.

FIG. 4 shows a connector 7 fixed to a circuit board different from the flexible printed circuit board and electrically connected to a circuit pattern arranged on the circuit board. Includes a plurality of U-shaped contact pieces 8 having elasticity and conductivity, and each of these contact pieces 8 is electrically connected to each circuit pattern on the circuit board.

When the flexible printed circuit board is connected to the connector, the flexible printed circuit board is inserted in the direction of arrow A, and the integrated terminal pattern 3, base film 1 and auxiliary plate 5 are connected to the contact piece 8. It is clamped and fixed between the stoppers 8a. In this fixed state, the terminal pattern 3 and the contact piece 8 are electrically connected, and as a result, each pattern 2 of the flexible printed board and each circuit pattern on the circuit board are electrically connected.

When the flexible printed circuit board is connected to the connector 7, it is necessary to accurately align the terminal pattern 3 with the locking portion 8a of the connector 7. During this alignment, the base 7a and the contact piece of the connector 7 are aligned. It is expected that the tip end of the terminal 8 will come into contact with the tip end surface 3a of the terminal pattern 3, but in this case, as described above, the tip end surface 1a of the base film 1 is a predetermined distance d from the tip end surface 3a of the terminal pattern 3. Since it projects, only the tip portions 1a and 5a of the base film 1 and the auxiliary plate 5 actually come into contact with each other, and the tip surface 3a of the terminal pattern 3 does not come into contact with each other, so that the pattern peeling due to the contact is prevented. It

In the present invention, when a so-called NON-ZIF type is used as the connector 7, which does not use a lock mechanism and realizes the coupling of the flexible printed circuit board and the connector only by sandwiching between the locking portions 8a. It is especially effective. The reason for this is that since the locking mechanism is not used, it is necessary to increase the clamping force at the locking portions 8a, so that a structure such as narrowing the gap between the locking portions 8a is required, and the tip of the terminal pattern 3 This is because the contact with the contact piece 8 is likely to occur more frequently.

Further, in each drawing, the terminal pattern 3 is arranged at one end of the flexible printed board, but it is needless to say that it is usually arranged at both ends. Was omitted.

[0015]

[Effect of device]

 As described above, according to the present invention, when the end portion of the flexible printed circuit board is inserted into the connector, the base film protruding by a predetermined amount from the terminal pattern provided at the end portion is used as the terminal body on the connector body or the connector side. Contacts the end surface of the terminal pattern, and the contact with the terminal pattern is suppressed as much as possible, and the pattern peeling of the terminal pattern can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a plan view of an embodiment of the present invention.

FIG. 3 is a side view of an embodiment of the present invention.

FIG. 4 is a side view of a connector according to an embodiment of the present invention.

FIG. 5 is a perspective view of a conventional example.

FIG. 6 is a perspective view of a conventional example.

FIG. 7 is a perspective view of a conventional example.

[Explanation of symbols]

 1 base film 2 circuit pattern 3 terminal pattern 4 cover film

Claims (1)

[Scope of utility model registration request] 1. A base film having a circuit pattern on its upper surface, and a cover film covering the base film so that a part of the circuit pattern is exposed as a terminal pattern. A flexible printed circuit board, characterized in that it protrudes from the tip surface of the terminal pattern by a predetermined amount.