JP2517653Y2 - Reinforcement structure for connecting terminals of flexible wiring board - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure for connecting terminals in a flexible wiring board, and more specifically,
The present invention provides a flexible wiring which prevents bending of the connecting terminal portion of a flexible wiring board of this type when the connecting terminal portion is inserted and connected to a connector, thereby suitably eliminating problems such as disconnection. The present invention relates to a reinforcing structure for connecting terminals of a board.

[0002]

2. Description of the Related Art In various electric and electronic devices, as a general means for electrically connecting a flexible wiring board and a rigid circuit board, mutual connection terminal portions of those boards are used. Soldering method, a method in which the mutual connection terminal portions are arranged so as to face each other, and pressure connection is performed using an appropriate pressure contact tool, and a connection terminal portion of a flexible wiring board is inserted and connected to a connector mounted on a hard circuit board. Or a method in which the connecting terminal portions of both substrates are overlapped with each other to perform through-hole connection.

Particularly, the method of electrically connecting the flexible wiring board and the hard circuit board via the connector has a detachable structure as compared with the above-mentioned soldering method or pressure contact connection method. It is widely used in various electronic devices because it can easily handle maintenance and inspection of the connection part.

By the way, as a conventional structure of the connection terminal portion of the flexible wiring board used for electrically connecting the flexible wiring board and the rigid circuit board with a connector, as shown in FIG. The part is reinforced from the back surface of the flexible insulating base member 1 with a reinforcing plate 7 having a required thickness, and further, a required inspection terminal is provided at a portion of the connection terminal portion which is not inserted into the connector, so that an electrical check by a short circuit is made. In some cases, the reinforcing plate 6 having a high heat resistance so as to withstand the above is provided with the reinforcing plate 7 and the ends 6A, 7A thereof being linearly adjacent to each other.

However, as shown in FIG. 7, bending stress and shearing force due to bending are applied to the linear adjacent boundaries between the reinforcing plates 6 and 7, so that the circuit wiring pattern 2 is ruptured or broken. There was a problem. Reference numeral 3 indicates a surface protective layer of the circuit wiring pattern 2.

[0006]

Therefore, according to the present invention, in the case of a structure in which a plurality of reinforcing plates are provided on the back surface of the connecting terminal portion of the flexible wiring board, bending or shearing may occur at the adjacent boundary portions of the reinforcing plates. (EN) A reinforcing structure for connecting terminals of a flexible wiring board which can surely prevent breakage or disconnection of a circuit wiring pattern.

Therefore, in the structure for reinforcing the connecting terminal portion of the flexible wiring board according to the present invention, a flexible wiring board in which a required circuit wiring pattern is formed on one surface of the flexible insulating base member. In this case, a plurality of reinforcing plates are provided on the back surface portion of the flexible insulating base member at a position corresponding to the terminal portion of the circuit wiring pattern, and adjacent boundary portions of these reinforcing plates are mutually separated. It is configured in a concavo-convex shape so that it is complicated.

In such a connecting terminal portion reinforcing structure for a flexible wiring board, the heights of the uneven portions are made different so that the uneven portions of the reinforcing plates are not arranged on the same line. It is also preferable to form the boundary portions adjacent to each other obliquely.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, the back surface of a flexible insulating base member 1 corresponding to a connection terminal portion of a flexible wiring board is made of, for example, polyethylene imide resin having a thickness of about 1.0 mm. And a reinforcing plate 4 made of epoxy resin-impregnated glass fiber or polyethylene having a thickness of about 0.2 mm are formed in a concavo-convex shape so that mutually adjacent boundary portions 4A, 5A are intricately formed. It is affixed by means of a press laminator or the like via. Then, this connection terminal portion is inserted into the connector from the tip portion of the thin reinforcing plate 5.

As described above, the adjacent boundary portions 4A and 5A of the reinforcing plates 4 and 5 are made up of the uneven portions which maintain an appropriate distance from each other.
Since the reinforcing plates are formed so as not to be arranged on the same line in the width direction of the reinforcing plate, the reinforcing plates 4 and 5 are alternately located as shown in FIG. Therefore, bending stress or shearing stress is not concentrated on the adjacent boundary portions 4A and 5A, so that the circuit wiring pattern 2 is formed.
It is possible to preferably prevent breakage or disconnection of the.
In FIG. 2, reference numeral 3 denotes a surface protective layer covering the wiring pattern 2 other than the terminal portion.

As shown in FIG. 3, the flexible wiring board is provided with inspection terminals 2A for electrical check at appropriate places on the opposite surface where the thick reinforcing plate 4 is located, and the tip portion of the wiring pattern 2 is As shown in the figure, the surface protection layer 3 is not provided and the exposed connection terminal portion is formed.

In addition to the concave and convex shape of the adjacent boundary portions of the two reinforcing plates 4 and 5 shown in FIG. 1, the concave and convex portions are formed to have different heights as shown in FIG. The structure of the adjacent boundary portions 4B and 5B which are not aligned with each other may be adopted. Further, as shown in FIG. 5, the shapes of the adjacent boundary portions 4C and 5C in which the heights of the irregularities are different and the boundary portions are formed obliquely are adopted. As a result, the bending stress or the shear stress related to the boundary portion can be dispersed appropriately, and the strength against breakage or disconnection at that portion can be further increased.

[0013]

EFFECTS OF THE INVENTION According to the connecting terminal portion reinforcing structure in the flexible wiring board according to the present invention, when a plurality of reinforcing plates are provided on the back surface of the connecting terminal portion, the adjacent boundary portions of these reinforcing plates are Since it is configured in a concavo-convex shape so as to be intertwined with each other, it is possible to preferably eliminate the problem of breaking or breaking at the adjacent boundary part of each reinforcing plate due to bending stress or shear stress accompanying bending, It is possible to realize a highly reliable reinforcing structure of the connection terminal portion without requiring the parts and processes.

Further, by forming the uneven portions of each reinforcing plate so that they are not arranged on the same line, the bending stress or shear stress at the adjacent boundary portion of the reinforcing plates is preferably dispersed to prevent breakage or breakage of that portion. The strength against disconnection can be further increased.

[Brief description of drawings]

FIG. 1 is a plan view of a connecting terminal portion reinforcing structure for a flexible wiring board according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a plan view of a connection terminal portion side according to the present invention.

FIG. 4 is a plan view showing another reinforcing structure of a connecting terminal portion of the present invention.

FIG. 5 is a plan view of a reinforcing structure of a connecting terminal portion of the present invention.

FIG. 6 is a plan configuration diagram of a connection terminal portion reinforcing structure according to a conventional example.

FIG. 7 is a diagram for explaining a problem of a conventional connecting terminal portion reinforcing structure.

[Explanation of symbols]

 1 Flexible Insulation Base Member 2 Circuit Wiring Pattern 2A Inspection Terminal 3 Surface Protection Layer 4 Reinforcement Plate 4A Adjacent Boundary 5 Reinforcement Plate 5A Adjacent Boundary

Claims (2)

(57) [Scope of utility model registration request] 1. A flexible wiring board in which a required circuit wiring pattern is formed on one surface of a flexible insulating base member.
A plurality of reinforcing plates are provided on the back surface of the flexible base member at positions corresponding to the terminals of the circuit wiring pattern, and the adjacent boundary portions of these reinforcing plates are formed in a concavo-convex shape. A reinforcing structure for connecting terminals of a flexible wiring board configured as described above. 2. The concave and convex portions of the reinforcing plate are appropriately spaced from each other.
The connection terminal portion reinforcing structure for a flexible wiring board according to claim 1, wherein the reinforcing terminal is held and is not arranged on the same line in the width direction of the reinforcing plate .