JP2607815B2 - Flexible flat cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to flexible wiring used for internal wiring of electronic equipment such as communication equipment and computers.
It relates to a flat cable (hereinafter abbreviated as FFC).

[0002]

2. Description of the Related Art In a connection portion of a conventional detachable connector used to connect an FFC to a wiring of a circuit board, it serves as a guide when a plug is inserted into an inner wall of the connector. Protrusions are provided.

[0003] As shown in FIG. 4, a plurality of conductors of a cable are provided in parallel as exposed conductors on a flat plate at an end portion 2 of the FFC which is inserted into and connected to the connector 4. When the conductor is inserted into the connector 4
Are in contact with contact terminals (not shown) of the connector 4 to ensure electrical conduction.

[0004] Various guide elements are provided inside the FFC end portion 2 and the connector 4 so that the FFC end portion 2 can be smoothly inserted into the connector 4, but in the example shown in FIG.
An insertion guide groove 5 is provided on the flat plate of the FFC end portion 2, an insertion guide protrusion 7 is provided on the inner wall inside the connector 4, and the insertion guide groove 5 of the FFC end portion 2 is provided on both side surfaces of the insertion guide protrusion 7.
To allow the FFC end 2 to be smoothly inserted into the connector 4.

Here, the case where the insertion guide projection 7 and the insertion guide groove 5 are the only insertion guides has been shown. However, as shown in FIG. 5, a plurality of insertion guides may be provided to form a connection structure having a plurality of insertion guides. .

Usually, an erroneous insertion prevention guide is provided so that the contact terminal inside the connector 4 and the exposed conductor 3 on the flat plate 2 of the FFC end face each other accurately and surely contact each other to secure electrical conduction. The plurality of FFC insertion guides serve as insertion guides having different widths, and in FIG.

In the pair of the FFC end portion 2 and the connector shown in FIGS. 4 and 5, since the FFC is not locked in the connector, the FFC may come off when an external force is applied carelessly.

[0008] It is not to say that a device for preventing such a possible FFC loss has not been proposed. For example, as shown in FIG. 6, a rectangular projection 13 is provided on the inner wall of the housing at the entrance of the connector 8, and this projection fits into a recess provided on the conductor support plate (backing plate 11) at the end of the FFC. A lock mechanism has been proposed in which the FFC is prevented from coming off by being secured by the pressing force of the spring-like contact terminal 12.
(See Japanese Unexamined Patent Publication (Kokai) No. 56-79871.) However, in order to improve the fitting, high processing accuracy is required, and the spring-like contact terminal 12 which originally plays a role of electrical conduction is required to secure the fitting.
Therefore, an extra load is applied to the spring-like contact terminal 12 because the spring force depends on the spring force.

Further, as shown in FIG.
Notches 18 (or projections) are provided at both ends in the longitudinal direction, and engaging projections 19 (or notches) are provided on the inner wall of the housing of the connector 16 to engage with the notches 18 (or projections).
A lock mechanism has been proposed in which the engagement between the notch 18 and the projection 19 prevents the end of the FFC from coming off. (See Japanese Utility Model Laid-Open No. 62-26882.) However, in this lock mechanism, the size of the connector 16 is increased, and additional concavities and convexities are required, which complicates the operation.

An object of the present invention is to provide an excellent flexible flat cable which solves the above-mentioned drawbacks of the conventional technology and which can prevent the FFC from coming off while using a small and simple connector conventionally used conventionally. Is to do.

[0011]

The above object is achieved by providing a flexible flat cable according to the present invention.

That is, a terminal portion of a flexible flat cable having a pair of insertion guide protrusions and having the same width and having a long insertion guide groove in the insertion direction is connected to the connector having the insertion guide protrusion along the insertion guide protrusion. In the inserted connection structure portion, a flexible flat cable characterized in that a projection for narrowing the entrance is provided in the insertion guide groove of the flexible flat cable terminal portion, the connection structure portion of the connector and the terminal portion of the flexible flat cable. A flexible flat cable characterized in that an insertion guide provided with a projection for narrowing the entrance in the insertion guide groove of the flexible flat cable terminal portion is provided in conformity with the erroneous insertion prevention guide.

Here, the FFC insertion guide means an insertion guide composed of a pair of insertion guide projections and an insertion guide groove, which is formed in a connection structure portion composed of a connector and an FFC terminal portion. As described above, a plurality of insertion guides may exist in one connection structure.

The structure and operation of the flexible flat cable according to the present invention will be described below with reference to FIGS.

In FIG. 1, the terminal portion 2 of the FFC 1 has a plurality of exposed conductors 3. When the FFC terminal portion 2 is inserted into the connector 4 between the exposed conductors 3, a groove 5 serving as an insertion guide is provided.
Is provided. In FIG. 3, one insertion guide groove 5 is provided.
Two conventional type insertion guide grooves 8 are provided. The insertion guide groove 5 in FIG. 1 and FIG. 3 is a removal prevention insertion guide groove which is a feature of the present invention.

An insertion guide projection 7 is provided on the inner wall of the connector housing (as a pair with the insertion guide groove 5 and the conventional insertion guide groove 8).

A groove projection 6 is provided at the entrance of the insertion guide groove 5 of the FFC terminal portion 2 shown in FIGS. The other two insertion guide grooves 8 of FIG. 3 do not have the groove protrusions 6.

At the time of insertion, the insertion guide projection 7 passes over the groove projection 6 at the entrance of the insertion guide groove 5. At this time, if the insertion guide groove 8 exists adjacent to the insertion guide groove 5, FIG.
As shown in (1), it is also possible to reduce the distortion when the insertion guide projection 7 passes through the groove projection 6.

In FIG. 2, the terminal 4 of the FFC 1 is connected to the connector 4.
Indicates a state in which is inserted. As shown in FIG. 2, the insertion guide projection 7 in the connector 4 is held by the wide portion of the insertion guide groove 5, and the insertion projection 7 is prevented from coming off by the groove projection 6. This is the function of preventing the FFC terminal portion 2 from coming off by the groove projection 6 of the present invention.

As described above, a guide for preventing incorrect insertion is usually provided so that the contact terminal inside the connector 4 and the exposed conductor 3 on the flat plate of the FFC end 2 accurately face each other and securely contact to ensure electrical conduction. However, if the role of the erroneous insertion prevention guide is matched with the plug insertion guide of the present invention having the groove protrusion 6, even the connection structure having a plurality of insertion guides can be distinguished from other plug insertion guides by the tactile sensation at the time of insertion. Incorrect insertion is avoided.

[0021]

【The invention's effect】

1. By providing a plug insertion guide having a groove projection on the insertion guide, accidental plug removal during use can be prevented.

2. By providing a plug insertion guide having a groove projection in the insertion guide, erroneous insertion can be avoided from the feeling of insertion into the connector.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an example before an FFC connection structure according to the present invention is inserted.

FIG. 2 is an explanatory diagram of an example after insertion of an FFC connection structure according to the present invention.

FIG. 3 is an explanatory view of another example before insertion of the FFC connection structure of the present invention.

FIG. 4 is an explanatory diagram of an example before insertion of a conventional FFC connection structure.

FIG. 5 is an explanatory view of another example before insertion of a conventional FFC connection structure.

FIG. 6 is an explanatory diagram of an example of a conventional detachment prevention FFC connection structure.

FIG. 7 is an explanatory view of another example of the conventional detachment prevention FFC connection structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 FFC 2 Terminal part 3 Exposed conductor 4 Connector 5 Insertion guide groove 6 Groove protrusion 7 Insertion guide protrusion 8 Conventional type insertion guide groove 9 FFC 10 Exposed conductor 11 Backing plate 12 Spring contact 13 Rectangular protrusion 14 FFC 15 Terminal part 16 Connector 17 Exposed conductor 18 Notch 19 Engagement protrusion

Claims (2)

(57) [Claims] An end of a flexible flat cable having a pair of insertion guide projections and having the same width and having a long insertion guide groove in the insertion direction is provided along a connector having the insertion guide projection along the insertion guide projection. In the inserted connection structure, a protrusion for narrowing an entrance is provided in an insertion guide groove of a terminal portion of the flexible flat cable. 2. A connection structure between a connector and a terminal of a flexible flat cable,
A flexible flat cable characterized in that an insertion guide provided with a projection for narrowing an entrance in an insertion guide groove of a flat cable terminal portion is provided in conformity with an erroneous insertion prevention guide.