JPH08181404A - Flexible board and electronic device using flexible board - Google Patents

Abstract

PURPOSE: To improve operability when a circuit board is fitted on a body and is smoothly attached to or detached from a flexible board. CONSTITUTION: A speaker placed in a body 1 is electrically connected with a circuit board 4 fitted on the body 1 via a flexible board 2. The flexible board 2 has U-shaped band bodies 6 that are not overlaid on each other, and under a condition that the circuit board 4 is fitted on the body 1, the U-shaped band bodies 6 are folded without almost giving bending returning ability to the circuit board 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible substrate for connecting an electric member and a mating member, and an electronic device using the flexible substrate.

[0002]

2. Description of the Related Art Conventionally, there are the following electronic devices using such a flexible substrate. In the following description, a portable telephone is used as an electronic device, and a so-called flexible PCB, in which a conductive pattern is sandwiched between transparent thin films made of polyimide or the like on the flexible substrate (2), will be described as an example. Also, a circuit board on which a predetermined circuit component is mounted as an electric member.
(4), the speaker (3) is mentioned as a counterpart device electrically connected to the circuit board (4).

As shown in FIG. 8, a speaker (3) is mounted in a main body (1) of a telephone whose upper surface is open.
Circuit board (4) covers (3). A connector (9) is attached to the back surface of the circuit board (4). Speaker (3)
The flexible board (2) that electrically connects the circuit board (4) with the
As shown in FIG. 6, it has a first connection part (20) connected to the speaker (3) and a second connection part (21) connected to the connector (9), and both connection parts (20) ( 21) are connected by an L-shaped connecting strip (7). When connecting the speaker (3) and the first connecting part (20), the first connecting part (20) is bent as shown in FIG. When the circuit board (4) is stored in the main body (1) from the state shown in FIG. 8, the connecting strip (7)
Bend the longer piece of with your fingers and store it while flexibly deforming.

[0004]

In the conventional flexible board, when the circuit board (4) is attached to the main body (1), it is necessary to insert the flexible board (2) while bending the flexible board (2) with a finger. ,
It is troublesome and the workability is poor. In this case, if the flexible board (2) is shortened, it is difficult to attach and detach the circuit board (4) and the flexible board (2), and at the time of repair, the circuit board (4) is attached to the main body (1).
It is difficult to remove from An object of the present invention is to improve workability when attaching the circuit board (4) to the main body (1) and to smoothly attach and detach the circuit board (4) and the flexible board (2). .

[0005]

[Means for Solving the Problems] A flexible substrate has a U-shape that extends in a bellows shape at a position where the main body (1) and the mating member are separated from each other, without any overlapping portion in a planar state. It has a strip (6). Further, in the electronic device, the electric member and the counterpart member are connected by the flexible substrate (2), and the flexible substrate (2) is connected.
Has a U-shaped band (6) that bends in a U-shape in a planar state, bends in a U-shape, and extends in a bellows shape at a position where the main body (1) and the counterpart member are separated from each other.

[0006]

[Operation and effect] When the mating member is attached to the main body (1), the U-shaped strip (6) of the flexible substrate (2) is gradually folded as the mating member is attached. , The bending return force applied to the counterpart member is alleviated. Therefore, unlike the conventional case, it is not necessary to attach the flexible substrate (2) while bending and deforming the flexible substrate (2) with a finger, and the workability is improved. Further, when the mating member is removed from the main body (1), the U-shaped band (6) extends in a bellows shape, and a large gap can be provided between the mating member and the main body (1). Therefore, the mating member and the flexible substrate
(2) can be easily attached and detached.

[0007]

EXAMPLE As shown in FIG. 1, the main body (1) is composed of a bottom plate (10) and side plates (11) provided upright on the outer peripheral edge of the bottom plate (10). A speaker (3) is placed on the bottom surface. A circuit board (4) is housed in the main body (1) substantially parallel to the bottom plate (10) so as to cover the speaker (3). Circuit board
A connector (9) is provided on the back surface of (4), and
(4) Various circuit components are attached on the top, but the circuit configuration is not closely related to the technical contents of this embodiment, and detailed description thereof will be omitted. The side plate (11) has a speaker
The operation button (5) for adjusting the volume of (3) is attached, and the speaker (3), the circuit board (4), and the operation button (5) are electrically connected by the elongated flexible board (2). There is. Flexible substrate (2)
Is attached so as to be parallel to the bottom surface of the main body (1) at the attachment portion with the speaker (3).

As shown in FIG. 3, the flexible board (2) is fitted to the connector (9) of the circuit board (4) and the first connecting portion (20) which is connected to the speaker (3) by soldering. In addition, it has a second connecting portion (21) having a conductive pattern exposed at its tip and a third connecting portion (22) attached to the operation button (5). The first connecting portion (20) has an arc shape so as to fit the outer peripheral edge of the speaker (3). The first connecting part (20) and the third connecting part (22) are connected strips.
It is connected by (7). Connecting strip (7) is the first connection
A first strip (71) extending from the (20), a second strip (72) extending from the third connecting part (22) in parallel with the first strip (71), and a first strip (71)
An intermediate belt portion (73) and an intermediate belt portion (73) which are integrally connected to the respective end portions of the belt portion (71) and the second belt portion (72) and form an obtuse angle with respect to both belt portions (71) (72). It consists of a U-shaped strip (6) extending integrally from 73).
A double-sided adhesive tape (70) is attached to the back side of the intermediate band (73). The U-shaped strip (6) is an intermediate strip of the connecting strip (7).
The first strip (61) extending from the second strip portion (72) side of (73) to the third connection portion (22) side and before reaching the third connection portion (22) have an arc shape of 180 °. Inverted arc strip (63) and arc strip (63)
The second strip (62) extends from the first strip (71) to the first strip (71), and the second connecting portion (21) is provided at the tip of the second strip (62). The first strip (61) and the second strip (62) do not overlap.

A so-called metal dome (8) is formed on the third connecting portion (22) to which the operation button (5) is connected. FIG. 4 is a view of the metal dome (8) taken along the line BB of FIG. 3, but the metal dome (8) has an insulating film (8) on the conductive pattern (80).
It has a three-layer structure in which 3) is covered and the insulating film (83) is covered with a conductive coating film (82). Insulating film (83) from the conductive pattern (80)
The protrusion (81) protrudes upward through the hole, the coating film (82) bulges upward, and is separated from the tip of the protrusion (81). With the third connecting portion (22) attached to the operation button (5), the tip of the coating film (82) faces the operation button (5). Operation button (5)
When is pressed, the coating film (82) contacts the protrusion (81) and the coating film (8
2) and the conductive pattern (80) can be energized.

As shown in FIG. 1, when the first connecting portion (20) is soldered to the speaker (3) and the circuit board (4) is to be attached from above the main body (1), the double-sided adhesive tape is used. (70)
Is attached to the bottom plate (10), and the second connecting portion (21) is connected to the connector (9).
Be inserted into. In this state, since the U-shaped strip (6) extends in a bellows shape, a sufficient space can be provided between the main body (1) and the circuit board (4), and the second space for the connector (9) can be provided. Connection
It is easy to insert (21).

2A and 2B are perspective views of FIG. 1 viewed from the direction of arrow A. From the state shown in FIG. 1, the circuit board (4) is lowered to remove the board (4). The state where it is attached to the main body (1) is shown. For convenience of explanation, the third connection part (22) is not shown. The U-shaped strip (6) of the flexible substrate (2) gradually closes its opening as the circuit substrate (4) descends, and gradually folds from the bellows shape. Since the U-shaped strip (6) is U-shaped,
They do not overlap each other, and the bending return force due to folding does not occur. Therefore, the restoring force is not applied to the circuit board (4), and the circuit board (4) can be smoothly moved to the main body.
It is attached to (1) (see Fig. 5).

The circuit board (4) may be removed from the main body (1) for the purpose of repair or replacement. Even in this case, since the U-shaped strip (6) of the flexible substrate (2) extends in a bellows shape, it is easy to pull the circuit board (4) upward from the main body (1), 4) Repair and replacement can be done easily. In other words, in order to suppress the flexure return force of the flexible substrate (2), the flexible substrate (2) may be shortened, but by shortening it, the circuit substrate (4) and the flexible substrate (2) may be shortened. ), The workability deteriorates when attaching and detaching. Therefore, the flexible substrate (2) according to this embodiment
Improves the workability both for attaching the circuit board (4) to the main body (1) and for attaching and detaching the circuit board (4) and the flexible substrate (2). Also, the flexible substrate (2) in this embodiment
Since there are no overlapping parts, they can be punched by pressing at once.

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a flexible board is attached to a circuit board and a speaker.

FIG. 2 is a diagram showing a state in which the circuit board is lowered toward the main body from the state shown in FIG.

FIG. 3 is a front view of a flexible substrate.

FIG. 4 is a cross-sectional view of the metal dome taken along the line BB in FIG.

FIG. 5 is a cross-sectional view showing a state in which a circuit board is attached to the main body.

FIG. 6 is a front view of a conventional flexible substrate.

FIG. 7 is a view in which the first connecting portion of the above flexible substrate is turned upside down.

FIG. 8 is a perspective view showing a state in which a conventional flexible board is attached to a circuit board.

[Explanation of symbols]

 (1) Main body (2) Flexible substrate (6) U-shaped strip

Claims (2)

[Claims] 1. A flexible substrate for electrically connecting an electric member housed in a main body (1) and a mating member, wherein there is no overlapping portion in a planar state, and there is a U-shaped bend,
A flexible substrate having a U-shaped strip (6) extending in a bellows shape at a position where the main body (1) and the counterpart member are separated from each other. 2. An electronic device in which an electric member mounted in a main body (1) and a mating member are connected by a flexible substrate (2), the flexible substrate (2) being in a planar state. An electronic device having a U-shaped band (6) that bends in a U shape without overlapping portions and that extends in a bellows shape at a position where the main body (1) and the counterpart member are separated from each other.