JP3149622U - Electrical connection mechanism - Google Patents

Abstract

Provided is a simple mechanism for absorbing a surplus length that occurs when a distance between a fixed part and a movable part is shortened when a fixed part and a movable part that slides are connected by a flat cable. . A fixing point 6 for fixing an end portion of the flat cable 5 or an intermediate portion in the vicinity of the end portion is provided in the fixed portion or the movable portion 2, and a portion of the flat cable 5 nearest to the fixing point 6 is provided around the fixing point 6.捲. Alternatively, in the same configuration, a thin plate spring material is stacked on the flat cable 5 and wound. With this configuration, the extra length generated when the distance between the fixed portion and the movable portion 2 is shortened is absorbed by increasing the diameter of the loop formed by the wound flat cable 5. [Selection] Figure 1

Description

  The present invention relates to an electrical connection mechanism that connects a movable part and a fixed part in various electric devices having a movable part that slides with a flat cable.

  Among various electric devices, there is one in which a part of the device (movable part) is configured to be slidable with respect to the fixed part. In this type of apparatus, the electrical connection between the movable part and the fixed part needs to absorb the slack of the electric wires accompanying the movement of the movable part, and various devices have been conventionally made. One example can be seen in a power feeding structure to a power window motor or the like in a sliding door in an automobile with a sliding door. For example, Patent Document 1 and Patent Document 2 propose a structure in which a box that accommodates a connection cable between a vehicle body and a sliding door in a loop shape is provided on the vehicle body side to absorb the extra length of the cable.

  As in the above example, a relatively large device such as an automobile is used as a cable between the movable portion and the fixed portion, and a highly flexible cable in which a stranded wire is bundled is used, but in the case of a small desktop device such as a measuring instrument. A flat flexible cable (FFC) in which many electric wires are arranged in parallel and a flexible printed wiring board (FPC) in which electric wires are printed on a flexible substrate are often used for this purpose (hereinafter, FFC and FPC are collectively referred to as flat). (Cable)

FIG. 4 shows a configuration example of a conventional apparatus in which a fixed portion and a movable portion that slides are connected by a flat cable.
In the figure, the movable part 2 above the fixed part 1 is slidably movable in the left-right direction in the figure, and the electric devices are provided on the printed circuit boards 3 and 4, respectively, and both are connected via connectors 31 and 41. Are connected to each other by a flat cable 5. Normally, it is used in the state shown in FIG. 5A, but when performing internal inspection or adjustment, the movable part 2 is slid as shown in FIG. (B) shows an intermediate process of the slide movement.

JP 2006-314176 A JP 2002-2288 A

  In the above configuration, in the intermediate process in which the movable part 2 is moved from the state of FIG. 4C in the direction of the arrow and returned to the state of FIG. ) Occurs, the extra length hangs down and is pinched and damaged by a slide mechanism or the like, and an accident such as disconnection or insulation deterioration may occur. In order to prevent this, for example, a mechanism for pulling the flat cable 5 with a hooking tool comprising a spring 7 and a pulley 8 indicated by phantom lines in FIG. Complicated and increased costs.

  The present invention has been made in view of the above circumstances, and occurs when the distance between the fixed portion and the movable portion is shortened when the fixed portion and the movable portion that slides are connected by a flat cable. It aims at providing the simple mechanism which absorbs surplus length.

In order to solve the above-mentioned problems, the present invention provides a fixing point for fixing the end portion of the flat cable or an intermediate portion in the vicinity of the end portion in the fixed portion or the movable portion, and the fixing point of the flat cable is around the fixing point. Wind the part. Alternatively, in the same configuration, a thin plate-like spring material, one end of which is fixed together with the flat cable at a fixed point, is wound on the winding portion of the flat cable.
With this configuration, the extra length generated when the distance between the fixed portion and the movable portion is shortened is absorbed by increasing the diameter of the loop formed by the wound flat cable.

  Since the present invention is configured as described above, it is possible to effectively absorb the excess length of the flat cable while preventing the damage of the flat cable while being a simple configuration, and further simplify the device configuration. There is also an effect of cost reduction.

It is a figure which shows one Example of this invention. It is a figure explaining operation | movement of one Example of this invention. It is a figure which shows the modification of this invention. It is a figure which shows the example of a conventional structure.

The device according to the present invention is provided with a fixing point for fixing the end portion of the flat cable or an intermediate portion in the vicinity of the end portion in the fixed portion or the movable portion, and an electric portion formed by winding the portion near the fixing point of the flat cable around the fixing point. Connection mechanism.
The best embodiment will be described in Example 1.

FIG. 1 is a perspective view showing a main part of one embodiment of the present invention.
This figure shows the inside of the fixing portion 1 (not shown in FIG. 1), and one end of the flat cable 5 is connected to a printed circuit board 3 on which an electric device is mounted via a connector 31. The flat cable 5 is bent in the vicinity of the end portion, changed in direction substantially at right angles, and fixed on the fixing base 62 by a fixing plate 61 (this point is referred to as a fixing point 6). A portion of the flat cable 5 immediately around the fixing point 6 is wound around the fixing point 6 2 to 3 times to form a loop, and the other end of the flat cable 5 is connected to the movable unit 2 (not shown).

FIG. 2 is a diagram for explaining the operation of this embodiment. In this figure, the same components as those in FIG. 1 or FIG. In FIG. 2, the printed circuit board 3 and the connector 31 in the fixed portion 1 are omitted.
FIG. 2A shows a normal use state, in which the movable part 2 is housed in the upper part of the fixed part 1, and the distance between the two is the shortest. At this time, the flat cable 5 expands by its own elasticity and forms a large-diameter loop.

Next, the movable part 2 is slid and moved to the state (c) through (b) which is an intermediate process. At this time, as the distance between the fixed portion 1 and the movable portion 2 increases, the flat cable 5 is stretched and the loop is tightened, and the loop diameter is reduced. In this case, since the center of the loop is fixed, the loop is not broken and the number of wrinkles does not decrease. As described above, the elasticity of the flat cable 5 itself acts in the direction of expanding the loop, so that tension is applied to the flat cable 5 and drooping can be prevented.
Similarly, when returning from the state of (c) to the state of (a) via (b), the distance between the fixed part 1 and the movable part 2 is shortened and the loop is expanded to absorb the surplus length, The drooping of the flat cable 5 is prevented.

  As an example of numerical values by experiment, when a flat core cable with a 21.25 mm width 16 core polyester film FFC is used, the maximum loop diameter is about 10 cm and the minimum loop diameter is about 5 cm. Was possible.

  FIG. 3 shows a modification of the present invention. In the figure, the same components as those in FIG. In this example, a convex printed circuit board 3a is used, a connector 31 is provided on the convex part, and this position is set as a fixed point 6, thereby reducing the number of parts and further cost reduction than the example shown in FIG. I have to.

  The present invention has various modifications in addition to the above-described modification examples. For example, since the relationship between the fixed portion 1 and the movable portion 2 is relative, the mechanism shown in FIG. 1 or 3 can be provided in the movable portion 2 if the space in the movable portion 2 allows. The action and effect of the camera will not change.

Further, for example, when a very flexible cable is used as the flat cable 5, it is assumed that the elasticity is insufficient and the extra length cannot be properly absorbed. In that case, lack of elasticity can be compensated by using a thin plate material having an appropriate elasticity such as phosphor bronze on the flat cable 5. In this case, the width of the thin plate material is about the same as or less than the width of the flat cable 5 and the length does not exceed the length of the wound portion of the flat cable 5, and the end is overlapped with the flat cable 5 and fixed. Fix with 6.
Furthermore, it is obvious that the electric device connected by the flat cable 5 is not limited to that mounted on the printed circuit board 3 or 4.

  The present invention can be used for various electric devices having a movable part that slides.

DESCRIPTION OF SYMBOLS 1 Fixed part 2 Movable part 3 Printed circuit board 3a Printed circuit board 4 Printed circuit board 5 Flat cable 6 Fixed point 7 Spring 8 Pulley 31 Connector 41 Connector 61 Fixed plate 62 Fixed stand

Claims (2)

  In the electrical connection mechanism for electrically connecting the fixed portion and the movable portion that slides with respect to the fixed portion within a predetermined movement range by a flat cable in which a plurality of conductive wires are arranged in parallel, the fixed portion or An electrical connection mechanism in which a fixing point for fixing an end portion of the flat cable or an intermediate portion in the vicinity of the end portion is provided on the movable portion, and the portion near the fixing point of the flat cable is wound around the fixing point.   The electrical connection mechanism according to claim 1, wherein an elastic thin plate material having one end fixed to the fixing point together with the flat cable is wound on the winding portion of the flat cable.

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