JP3367097B2 - Circuit board connection structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit board connection structure for electrically connecting two circuit boards arranged on the front and back surfaces of a chassis with an FFC (flexible flat cable).

[0002]

2. Description of the Related Art Conventionally, an FFC has been used as a cable for electrically connecting two circuit boards (printed boards). For example, as described in Japanese Patent Application Laid-Open No. 9-148010, FFC connectors are attached to two substrates, and both ends of the FFC have two Fs.
The two circuit boards were electrically connected by being inserted into the FC connector.

By the way, since the FFC is thin and bends freely, a reinforcing plate of an appropriate size is attached to the portion to be inserted into the FFC connector (the end portion of the FFC cable). By providing this reinforcing plate, the FFC does not bend when it is inserted into the FFC connector, and can be easily inserted (connected) into the FFC connector.

[0004]

However, as shown in FIG. 4, when the two circuit boards 24 respectively arranged on the front and back surfaces of the chassis 23 (rigid body) are electrically connected by the FFC 21, as shown in FIG. The reinforcing plate 22 attached to the end of the FFC 21 is in a state of protruding outside the chassis. For this reason, there is a problem that the reinforcing plate 22 protruding to the outside of the chassis 23 becomes an obstacle when carrying it or placing it in a manufacturing process or the like, and the workability is reduced. Reference numeral 25 shown in the figure is an FFC connector provided on the circuit board 24.

Here, the FFC connector 25 is connected to the FFC 2
When the 1 is connected, the reinforcing plate 22 is attached to the outside of the chassis 21.
Although the above problem can be solved by shortening the reinforcing plate 22 so that the FFC 21 does not pop out, when the FFC 21 is inserted into the FFC connector 25, the worker holds the end of the reinforcing plate 22 and holds the FFC connector 25. Since the FFC 21 is inserted in the, the shortening of the reinforcing plate 22 shortens the portion that the operator can hold. Therefore, the FFC 21 and the FFC connector 25
Work when connecting and becomes difficult (cannot be done smoothly)
There was a problem.

Further, instead of shortening the reinforcing plate 22,
By disposing the position of the FFC connector 25 inside the circuit board 24, the reinforcing plate 22 provided on the FFC 21 inserted in the FFC connector 25 as shown in FIG. You can, but
In this way, the FFC that connects the two circuit boards 24
21 becomes longer, so when installed in the device body, FF
C21 has a problem that noise is likely to be spread (especially,
Devices that use high frequencies are greatly affected by noise. ). Moreover, when the FFC 21 is connected to the FFC connector 25, since the reinforcing plate 22 is located above the chassis 21, there is no space below the reinforcing plate 22 for the operator's fingers or the like to enter, and as a result, FFC to FFC connector 25
Connection work of 21 becomes difficult (cannot be done smoothly).

Furthermore, the above-mentioned Japanese Patent Laid-Open No. 9-148010.
The publication discloses a structure in which the reinforcing plate 22 is provided not only on the end portion of the FFC 24 but also on the entire FFC 24. However, by providing the reinforcing plate 22 on the entire FFC 21, the FFC 21 becomes expensive and the cost is increased. There is. Moreover, F
There is also a portion where the FC 21 is bent at a substantially right angle by the reinforcing plate 22, and there is a problem that the wire is easily broken at this portion.

It is an object of the present invention to have a structure in which, when two circuit boards arranged on the front and back surfaces of a chassis are connected by an FFC, the reinforcing plate does not protrude outside the chassis and does not interfere with the FFC. An object of the present invention is to provide a circuit board connection structure that can be easily connected to an FFC connector provided on the circuit board.

[0009]

The circuit board connection structure of the present invention has the following structure in order to solve the above problems.

In the circuit board connection structure for electrically connecting the circuit boards respectively arranged on the front and back surfaces of the chassis by the FFC, a reinforcing plate is provided at least at an end portion of the circuit board arranged on one surface of the chassis. FF attached
The FFC connector with the end of C inserted is a shear
Installed at a position inside the end of the
When inserting the end of FFC into the connector,
A recess is formed on the chassis to allow the fingers to enter.
The FFC passes through, and the reinforcing plate is above the recess.
Positioned so that the end of the stiffener is inside the end of the chassis
Is located in.

[0011] In this configuration, the circuit board having a FFC connector connector FFC is arranged on the chassis so as to be located on the inner <br/> side than the end of the chassis. And
When you insert the end of FFC into the connector on the chassis
A recess is formed to receive the operator's finger . Therefore,
When the FFC is inserted into the FFC connector with the reinforcing plate, since the operator's finger or the like is located in the recess, the FFC can be easily inserted into the FFC connector without disturbing the circuit board or the like. Further, since the FFC, which connects two circuit boards arranged on the front and back surfaces of the chassis, passes through the recess, the cable length does not become long. Furthermore, connector FFC is located on the inner side than the end of the chassis, moreover,
The reinforcing plate is located above the recess and the end of the reinforcing plate is
Since it is located inside the chassis edge , the reinforcing plate is used for carrying and placing during the manufacturing process.
It is possible to prevent the workability from deteriorating without the reinforcing plate protruding outside and becoming an obstacle.

In the present invention, the recess is passed through the recess.
The arc surface that prevents the FFC from bending is
It may be configured to be formed.

[0013] In this configuration, without F FC bends substantially at a right angle, it can be improved reliability for disconnection of the FFC.

According to the present invention, the FFC is provided at the end of the circuit board.
Mount the connector inside the chassis edge
It has been burned. In addition, the reinforcing plate is located above the recess.
The edge of the reinforcement plate is located inside the edge of the chassis.
is doing. Therefore, from the end of the chassis,
The length to the position of the connector is almost the same as the reinforcing plate .

[0015]

DETAILED DESCRIPTION OF THE INVENTION FIG.
It is a figure which shows the cross section of a flat cable. As is well known, the FFC 1 is provided with the reinforcing plate 2 having an appropriate length at the ends (both ends in the figure) to be connected to the FFC connector.
Connection to the C connector can be done easily. The reinforcing plate 2
Is attached to FFC1 with double-sided tape 3. Figure 2
FIG. 2A is a diagram showing a circuit board connection structure of this embodiment, and FIG. 2B is a cross-sectional view of a portion AA in FIG. 2A. In the figure, reference numeral 5 is a chassis in which the circuit boards 6 are arranged on the front and back surfaces. Reference numeral 7 is an FFC connector attached to the circuit board 6, and 8 is a recess formed in the chassis 5. The FFC connector 7 is arranged at the end portion of the circuit board 6, and the circuit board 6 is arranged so that the FFC connector 7 is located inside the end portion of the chassis 5 by a predetermined amount (X in FIG. 2B). Is attached to. Also,
The reinforcing plate 2 provided on the FFC 1 is slightly shorter than the above X. The recess 8 formed in the chassis 5 is located in front of the FFC connector 7, and its width is slightly wider than that of the FFC 1.

When electrically connecting the circuit boards 6 arranged on the front and back surfaces of the chassis 5 with the FFC 1, the worker holds the reinforcing plate 2 and is mounted on the circuit board 6.
The front end of the FFC 1 is inserted into the connector 7 for use. At this time, since the reinforcing plate 2 is located above the concave portion 8, the reinforcing plate 2
Since the finger of the operator holding the finger enters the recessed portion 8, the upper surface of the chassis 5 does not get in the way and the FFC can be easily operated.
1 can be connected.

The ends of the reinforcing plate 2 provided at both ends of the FFC 1 to which the circuit boards 6 on the front and back surfaces of the chassis 5 are connected are located inside the chassis 5 as shown in FIG. Does not jump out of the chassis 5.). Therefore, the reinforcing plate 2 does not get in the way when it is carried or placed in the manufacturing process,
It is possible to prevent a decrease in workability.

Further, since the FFC 1 electrically connected to the circuit boards 6 arranged on the front and back surfaces of the chassis 5 can be passed through the recess 8, there is no problem that the cable length becomes long. Therefore, even when applied to a device using high frequency, sufficient reliability against noise can be secured.

Next, another embodiment of the present invention will be described. FIG. 3 (A) is a diagram showing a connection structure of the circuit board of this embodiment, and FIG. 3 (B) is A- in FIG. 3 (A).
It is sectional drawing of A part. The difference from the above-described embodiment is that an arc surface 11 shown in the drawing is formed in the recess 8 formed in the chassis 5 in the above-described embodiment.

By forming the arcuate surface 11, the FFC 1 electrically connected to the circuit boards 6 arranged on the front and back surfaces of the chassis 5 can be passed along the arcuate surface 11. Therefore, the FFC 1 can be prevented from being bent, and the reliability of the FFC 1 against disconnection can be improved.

In the above embodiment, the FFC connector 7 is provided on each of the two circuit boards 6 arranged on the front and back surfaces of the chassis 5, but one circuit board 6 is provided.
With respect to, even when the FFC 1 is connected by soldering or the like, the connection structure of the circuit board according to the present invention can be applied.

[0022]

As described above, according to the present invention, the FF
The circuit board having the C connector is arranged in the chassis such that the FFC connector is located inside the chassis end portion by a predetermined amount, and a recess is formed in the front of the FFC connector, so that the FFC connector is provided with the reinforcing plate. FF
When inserting C, the circuit board etc. can be easily
FC can be inserted into FFC connector. In addition, an FFC that connects two circuit boards arranged on the front and back of the chassis.
With regard to, the cable length does not become long by passing through the recess. Furthermore, if the length of the reinforcing plate is set to the above predetermined amount or less, the reinforcing plate does not protrude outside the chassis,
It is possible to prevent the workability from deteriorating without the reinforcing plate interfering with the carrying or placing in the manufacturing process or the like.

Further, by forming an arcuate surface in the recess, it is possible to prevent bending of the FFC, and it is possible to improve the reliability of FFC disconnection.

[Brief description of drawings]

FIG. 1 is a diagram showing a cross section of an FFC.

FIG. 2 is a diagram showing a circuit board connection structure according to an embodiment of the present invention.

FIG. 3 is a diagram showing a circuit board connection structure according to another embodiment of the present invention.

FIG. 4 is a diagram showing a conventional circuit board connection structure.

FIG. 5 is a diagram showing a conventional circuit board connection structure.

[Explanation of symbols]

1-FFC 2- Reinforcing plate 5-chassis 6-circuit board Connector for 7-FFC 8-recess 11-Arc surface

Claims (2)

(57) [Claims] 1. A circuit board connection structure for electrically connecting, by FFC, circuit boards respectively disposed on the front and back surfaces of a chassis, wherein at least an end portion of the circuit board disposed on one surface of the chassis is reinforced. Edge of FFC with plate attached
The FFC connector in which the
It is attached at a position more inside than
The operator's finger enters when inserting the end into the connector
A recess is formed in the chassis, and the FFC is formed in the recess.
And the reinforcing plate is located above the recess.
The end of the reinforcing plate is located inside the end of the chassis.
Connection structure of the circuit board are. 2. The above recess passing through the recess.
An arc surface is formed to prevent the FFC from bending
The circuit board connection structure according to claim 1 .