JP2000060048A - Disconnection preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To positively avoid the disconnection of a lead wire wound on the electrical continuity terminal of an actuator. SOLUTION: A disconnection preventing device consists of a preventing mechanism 36 with a protruding shape. The preventing mechanisms 36 are respectively provided at the bases of a plurality of electrical continuity terminals 33 themselves, which are made to protrude on a stepping motor 32. The preventing mechanisms 36 are provided at positions on the outside and same side of a straight line connecting the electrical continuity terminals 33. Even if a flexible printed circuit board 31 is inserted to the electrical continuity terminals 33, the flexible printed circuit board 31 is held by the preventive mechanisms 36 at the bases of the terminals 33 and is made to stay in the middle parts of the terminals 33. Therefore, since the flexible printed circuit board 31 is not warped at the bases and is not pressed against lead wires 35 drawn out of the bases of the preventive mechanism 36, the stress produced by the flexible printed circuit board 31 will not apply on the lead wire 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing disconnection of a conductor wound around a conductive terminal of an actuator.

[0002]

2. Description of the Related Art A driving actuator such as a step motor is used to drive a lens unit such as a zoom lens and a focus lens of a video camera. For example, in order to supply voltage to this step motor,
The step motor and the video camera body are connected by a flexible substrate (hereinafter, may be abbreviated as "flexible").

FIG. 4 is a side view showing a state in which the flexible substrate 1 is inserted into a conduction terminal 3 provided on a step motor 2. A conducting wire such as copper (Cu) is wound in advance on the conduction terminal 3. By inserting the flexible substrate 1 into the conduction terminal 3, the video camera body 4 and the step motor 2 are connected via the flexible substrate (flexible) 1. FIG. 5 shows a schematic side view of a video camera to which these are connected.

[0004] Previously, the conducting wire 5 wound around the conduction terminal 3 of the stepping motor 2 was thick, and when the flexible 1 was inserted, the conducting wire 5 was rarely broken. However, in recent years, as the size of a video camera has been reduced, the size of a lens and the size of a mounted step motor have also been reduced.
For this reason, it is necessary to make the conductive wire wound around the conduction terminal of the step motor thin. When the conductive wire becomes thin, breakage of the conductive wire occurs frequently due to stress (friction, pressure) generated when the flexible substrate is inserted into the conductive terminal.

FIG. 6 shows a process in which the conductive wire 15 is broken by receiving stress from the flexible substrate 1. Fig. 6 (1)
(2) is a side view of the step motor 2, and FIG.
(3) and (4) are front views of the step motor 2. A thin conducting wire (winding) 15 is wound around each conduction terminal 3 of the stepping motor by a winding machine (not shown). Then, as shown in FIG. 6A, the flexible substrate (flexible) 1 is inserted into the conduction terminal 3. Fig. 6 (2)
As shown in (4), when the flexible 1 is inserted to the base of the terminal 3 for conduction, the flexible 1 contacts and presses the conductive wire 15 drawn out from the base of the terminal 3. As a result, stress is generated between the flexible cable 1 and the conductor 15, and the drawn conductor 15 is disconnected.

In order to cope with this, by preventing the flexible 1 from being inserted up to the base of the terminal 3, the conductor 15
In order to prevent disconnection, a disconnection prevention device has been proposed. FIG. 7A is a front view of a step motor 2 provided with a conventional disconnection prevention device, FIG. 7B is a side view thereof, and FIG. 7C is a perspective view thereof. The disconnection prevention device has a prevention mechanism 6 formed in a convex shape. The prevention mechanism 6 is provided at a position away from the root of the conduction terminal 3, that is, at an end surface on the step motor 2. When the flexible 1 is inserted into the conductive terminal 3 on which the conductive wire 15 is wound, both ends of the lower surface of the flexible 1 abut on the upper surface of the prevention mechanism 6. Therefore, the flexible 1 is not inserted to the base of the terminal 3 but stays in the middle of the terminal 3. This prevents the conductive wire 15 drawn out from the base of the terminal 3 from contacting and pressing the flexible 1 and being disconnected.

[0007]

Since the above-described conventional disconnection prevention device is provided at a position away from the base of the conduction terminal, a space is provided between the base of the conduction terminal and the inserted flexible cable. Occurs. Therefore, when inserting the flexible cable into the conductive terminal, as shown in FIG.
Are easily bent toward the base of the terminal 3.

[0008] Usually, after the flexible 1 is inserted into the conduction terminal 3, soldering is performed. At the time of this soldering, the flexible 1 is pressed by the soldering iron 7 and bends toward the root of the terminal 3 as shown in FIG.

Due to these flexures, the flexible contacts and presses the conductor 15 drawn out from the base of the terminal 3, and stress is generated between the flexible 1 and the conductor 15 to cause the conductor 15 to be stressed.
Disconnection will occur.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a disconnection prevention device capable of reliably preventing a conductor wound around a conduction terminal of an actuator from being disconnected. To provide.

[0011]

According to the present invention, there is provided a device for preventing disconnection of a wire wound around a conductive terminal of an actuator. A prevention mechanism is provided at the base of the common terminal itself.

Further, the disconnection prevention device according to the present invention is a disconnection prevention device for preventing disconnection of a conductive wire wound around a conduction terminal of an actuator into which a flexible board is inserted; And a convex preventing mechanism is provided outside a straight line connecting the conducting terminals.

Since the prevention mechanism is provided at the base of the conduction terminal itself, the conductive wire can be wound integrally (together) with the conduction terminal and the prevention mechanism. Therefore, even if a flexible substrate is inserted into the conductive terminal on which the conductive wire is wound, the flexible substrate supported by the prevention mechanism and the conductive wire drawn out from the base of the prevention mechanism may contact and press. Absent. Therefore, stress (friction, pressure) due to the flexible substrate is not applied to the conductor. As a result, it may be left in this state for a long time,
Even if vibration is generated from the outside, the conductive wire can be prevented from being disconnected, so that the reliability of the product can be ensured.

Further, since the prevention mechanism is provided at the base of the conduction terminal itself, even if the flexible substrate is inserted into the conduction terminal on which the conductive wire is wound, the prevention mechanism is provided at the base of the terminal itself. Supports flexible substrates. Therefore, the flexible substrate does not bend at the base of the terminal itself. Therefore, the flexible board bends at the base of the terminal, so that stress (friction, pressure) is applied to the conductor.
This prevents the conductor from breaking. Even if a thin conductive wire is wound, the disconnection of the conductive wire is surely prevented, so that it is possible to cope with the miniaturization of the conduction terminal and the actuator having the conduction terminal.

Further, a prevention mechanism is provided at the root of the conduction terminal itself and outside of a straight line connecting the conduction terminals. Therefore, since there is no prevention mechanism between the conduction terminals, the needle of the winding machine does not hit the prevention mechanism when the conductor is wound around the conduction terminal by the winding machine. Therefore, the prevention mechanism is not obstructed when the conductor is wound, so that the prevention mechanism can be made thick.
That is, the degree of freedom regarding the thickness of the prevention mechanism is increased. Therefore, the flexible substrate can be reliably supported by the prevention mechanism, and the flexible substrate can be prevented from bending, and the effect of preventing disconnection can be increased.

Further, the bending of the flexible substrate is reliably prevented, and the disconnection of the conductor is prevented. This eliminates the necessity of the attention required during the work of inserting the flexible board into the conduction terminal and the work of soldering, and also eliminates the need for a jig and a tool for preventing disconnection, thereby improving the production yield.

When the conductor is wound around the conduction terminal by the winding machine, the conduction terminal and the prevention mechanism of the disconnection prevention device may be integrally and integrally wound together. Therefore, the conductive wire can be efficiently wound, and the working time can be reduced.

Further, when the prevention mechanism of the disconnection preventing device is provided, it is not necessary to newly add a special part, and the disconnection preventing device can be provided at low cost.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a disconnection prevention device provided on a step motor 32 according to the first embodiment of the present invention. The disconnection prevention device includes a prevention mechanism 36 having a convex shape. The prevention mechanism 36 is provided at the root of each of the plurality of conduction terminals 33 protruding from the step motor 32. In the case of the present embodiment, the prevention mechanism 3
Reference numeral 6 is provided at one position (one side) outside the straight line 34 connecting the conduction terminals 33. The material of the prevention mechanism 36 is, for example, a liquid crystal polymer.

FIG. 1A shows a conductive wire 33 made of copper (Cu) or the like for a conduction terminal 33 and a prevention mechanism 36 of a step motor 32.
It is a perspective view of the state which 5 was wound. Conduction terminal 3
At the root of 3, the terminal 33 and the prevention mechanism 36 are integrally and integrally wound together by a conducting wire 35. The leading end of the wound conductive wire 35 is drawn downward from the root of the prevention mechanism 36.

Hereinafter, the operation of the disconnection prevention device including the prevention mechanism 36 will be described step by step. Fig. 1 (2)
(3) and (4) are side views of a step motor in which the prevention mechanism 36 is provided at the base of the conduction terminal 33, and FIG. 1 (5) is a front view thereof.

As shown in FIG. 1 (3), the conducting wire 33 and the prevention mechanism 36 shown in FIG.
5 is wound up to the base. This winding is performed by a winding machine (not shown). At the base of the conduction terminal 33, the prevention mechanism 36 and the terminal 33 are integrally wound (joined together) by the conductor 35, and the tip of the conductor 35 is pulled out from the base of the prevention mechanism 36. In this state, the flexible board (flexible) 31 is inserted into the conduction terminal 33 as shown in FIG. The lower surface of the flexible 31 contacts the upper surface of the prevention mechanism 36 and is supported by the prevention mechanism 36. Thus, the flexible 1 stays in the middle of the conduction terminal 33. On the other hand, since the conductor 35 is drawn out from the base of the prevention mechanism 36, the flexible 31 does not contact and press (stress) the drawn conductor 35.

Next, a method of forming the prevention mechanism 36 will be briefly described. To form the prevention mechanism 36, a mold previously formed into a predetermined shape is used. This predetermined shape is such that the prevention mechanism 36 is formed at the base of the conduction terminal 33. The prevention mechanism 36 is formed using this mold when forming a resin (usually called a bobbin) into which a metal terminal is inserted.

According to the first embodiment, since the prevention mechanism 36 is provided at the base of the conduction terminal 33 itself, the conduction terminal 33 and the prevention mechanism 36 are integrated (together together). ) The conductor 35 can be wound. Therefore, even if the flexible substrate 31 is inserted into the conduction terminal 33 around which the conductive wire 35 is wound, the flexible substrate 31
Stays in the middle of the terminal 33 supported by the prevention mechanism 36. Therefore, the flexible substrate 31 and the conducting wire 35 pulled out from the base of the prevention mechanism 36 do not contact and press. Therefore, stress (friction, pressure) due to the flexible substrate 31 is not applied to the conductor 35. As a result, even if the conductor 35 is left in this state for a long period of time, or if vibration is generated from the outside, it is possible to prevent the conductive wire 35 from being disconnected, thereby ensuring the reliability of the product.

Further, since the prevention mechanism 36 is provided at the base of the conduction terminal 33 itself, even if the flexible substrate 31 is inserted into the conduction terminal 33 around which the conductive wire 35 is wound, the terminal 3 is not connected.
The prevention mechanism 36 supports the flexible substrate 31 at the base of 3 itself. Therefore, at the root of the terminal 33 itself,
The flexible substrate 31 does not bend. Accordingly, it is possible to prevent the flexible substrate 31 from bending at the base of the terminal 33 and to apply stress to the conductive wire 35, thereby preventing the conductive wire 35 from bending.
Is reliably prevented from breaking. Even if the thin conductive wire 35 is wound, the disconnection of the conductive wire 35 is reliably prevented.
The size of an actuator such as a step motor having the conduction terminal 33 can be reduced.

Further, it is the base of the conduction terminal 33 itself,
Further, the prevention mechanism 36 is provided outside a straight line connecting the conduction terminals 33. Therefore, between the conduction terminals 33 (the conduction terminal 33 at the end and the step motor 32).
(See FIG. 3), there is no prevention mechanism 36. Therefore, when the conductor 35 is wound around the conduction terminal 33 by a winding machine (not shown), the needle of the winding machine does not hit the prevention mechanism 36. In other words, in the related art, if the prevention mechanism is thickened when winding the conductive wire, the needle hits the prevention mechanism and hinders the winding. Therefore, the thickness of the prevention mechanism is limited to avoid this. However, since the prevention mechanism 36 of the present invention does not interfere with the winding of the conductor, the prevention mechanism 36 can be made thicker, and the degree of freedom of the thickness of the prevention mechanism 36 increases. Therefore, the flexible substrate 31 is prevented by the prevention mechanism 36.
Can be reliably supported, and the flexible substrate 3
1 can be prevented, and the effect of preventing disconnection can be increased.

Further, the bending of the flexible substrate 31 is reliably prevented, and the disconnection of the conductor 35 is prevented. This eliminates the necessity for the work of inserting the flexible board 31 into the conduction terminal 33 and the work of soldering, and also eliminates the need for a jig and a tool for preventing disconnection, thereby improving the production yield.

Further, when the conductor 35 is wound around the conduction terminal 33 by a winding machine (not shown), the conduction terminal 33 and the prevention mechanism 36 can be integrally wound (together). . Therefore, it is not necessary to wind the conductor 36 avoiding the prevention mechanism as performed in the conventional disconnection prevention device. Therefore, it is not necessary to program the winding machine so as to avoid the prevention mechanism 36, and the number of program steps by the winding machine can be reduced.
That is, the conductive wire 35 can be efficiently wound, and the working time can be reduced.

Further, when the prevention mechanism 36 of the disconnection prevention device is provided, it is not necessary to newly add a special part. Specifically, the prevention mechanism 36 can be formed at the time of bobbin formation using a mold prepared in advance. Therefore, since it is only necessary to change the shape of the conventional mold, the disconnection prevention device can be provided at low cost.

Next, a second embodiment of the present invention will be described. The same members as those in the first embodiment will be described with the same reference numerals. FIG. 2 is a diagram showing a disconnection prevention device according to a second embodiment of the present invention. This disconnection prevention device comprises a prevention mechanism 46 provided at both a position (both sides) outside of a straight line connecting the terminals 33 at the root of each conduction terminal 33. The conducting wire 35 wound around the conduction terminal 33 has a prevention mechanism 46 at the root of the terminal 33.
It is wound integrally (together). The distal end of the conducting wire 35 is drawn downward from the root of the prevention mechanism 46.

According to the second embodiment, the same effects as in the first embodiment can be obtained.

Further, since the prevention mechanism 46 is provided on both sides of the base of the conduction terminal 33, the effect of preventing disconnection is further exhibited as compared with the case where the prevention mechanism 46 is provided on one side of the base.

Next, a third embodiment of the present invention will be described. In the third embodiment, as shown in FIG. 3, every other prevention mechanism 56 is provided at the base of the plurality of terminals 33. In this case, the prevention mechanism 56 may be provided on one side of the base of the terminal 33 as in the first embodiment, or may be provided on both sides of the base of the terminal 33 as in the second embodiment. May be provided.

According to the third embodiment, substantially the same effects as those of the first and second embodiments can be obtained.

In each of the above embodiments, the prevention mechanism 3
Although 6, 46 and 56 are provided at the terminal 33 of the step motor 32, they are not limited to the step motor 32. That is, the present invention can be applied to all actuator terminals that receive power supply through connection with the flexible cable 31.

[0036]

As described above, according to the present invention, it is possible to reliably prevent breakage of a conductive wire wound around a conductive terminal of an actuator.

[Brief description of the drawings]

FIG. 1 is a diagram showing a disconnection prevention device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a disconnection prevention device according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a disconnection prevention device according to a third embodiment of the present invention.

FIG. 4 is a side view showing a state in which the flexible substrate 1 is inserted into the conduction terminal 3.

FIG. 5 is a schematic side view of a video camera.

FIG. 6 is a conventional view showing a process in which a conductive wire 15 is disconnected by receiving stress from a flexible substrate 1;

FIG. 7 is a diagram of a step motor 2 provided with a conventional disconnection prevention device.

FIG. 8 is a diagram illustrating a state in which the flexible substrate 1 bends toward the base of the terminal 3;

[Explanation of symbols]

1, 31: Flexible board (flexible), 2, 32: Step motor, 3, 33: Terminal for conduction, 4: Video camera body, 15, 35: Conductor (winding), 34: Straight line,
6, 36, 46, 56: prevention mechanism, 7: soldering iron.

Claims (2)

[Claims] 1. A disconnection prevention device for preventing a disconnection of a conductor wound around a conduction terminal of an actuator, wherein a prevention mechanism is provided at a root of the conduction terminal itself. 2. A disconnection prevention device for preventing a disconnection of a conductive wire wound around a conduction terminal of an actuator into which a flexible substrate is inserted; An apparatus for preventing disconnection, wherein a prevention mechanism having a convex shape is provided outside a connecting straight line.