JPH0724945Y2 - Mounting structure of FG magnetic resistance element - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mounting structure of a magnetoresistive element for FG.

[Outline of device]

In a motor equipped with an FG mechanism, a holder to which the magnetoresistive element is fixed is used to press and hold the tip of the output flexible board of the magnetoresistive element near the soldering land of the stator side circuit board for electrical connection. Also, the holder has a structure for mounting the FG magnetic resistance element on the stator so that the distance between the magnetic resistance element and the FG magnet can be finely adjusted.This simplifies the wiring and makes it easier to assemble the magnetic resistance element and the FG magnet. The distance between the magnetic resistance element and the magnetic resistance element can be easily finely adjusted, and the magnetic resistance element is prevented from being moved by an external force.

[Prior Art] Conventionally, in a motor having an FG mechanism such as a capstan motor, the output of the magnetoresistive element was directly connected to an external circuit by a lead wire. It is necessary to provide a connector at the end of the lead wire, and when something touches the lead wire, an external force is applied to the magnetoresistive element and the distance between the magnet and the FG magnet changes. However, there is a possibility that they may come into contact with each other, or the output level of the magnetoresistive element may be remarkably lowered to cause uncontrollability.

[Problems to be solved by the invention]

The purpose of this invention is to improve the drawbacks of the above-mentioned conventional device, and the wiring for output can be easily performed without using a connector or the like, and the magnetic field for FG that does not have an external force applied to the magnetoresistive element. It is to provide a mounting structure for a resistance element.

[Means for solving problems]

In order to achieve the above object, the mounting structure of the FG magnetic resistance element of the present invention is a motor for performing speed control by detecting the magnetic flux of the FG magnet provided on the outer peripheral surface of the rotor by the magnetic resistance element provided on the stator. In this case, a holder to which the magnetoresistive element is fixed is pressed and held near the tip of the output flexible board of the magnetoresistive element near the soldering land of the stator side circuit board to electrically connect the holder and the holder. It is attached to the stator so that the distance between it and the FG magnet can be finely adjusted.

[Action]

By doing so, the output of the magnetoresistive element is relayed to the stator side circuit board and connected to the drive control circuit together with the wiring for driving the motor, so that there is no risk of external force being applied to the output flexible board of the magnetoresistive element. Therefore, the distance between the magnetoresistive element and the FG magnet does not change.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. 1 is a plan view thereof, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is a left side view thereof.

The FG magnet 2a is formed on the outer peripheral surface of the rotor 2 of the capstan motor 1, and the magnetic resistance element 5 is fixed to the holder 4 supported by the stator side circuit board 3. The FG magnet 2a and the magnetic resistance element 5 are separated from each other. They are arranged facing each other with a minute interval.

One end of the holder 4 is attached to the stator side circuit board 3 by the pin 4a.
And the other end is supported by the long hole 4b and the screw 6 so that the position of the magnetoresistive element 5 can be adjusted.
The distance from the FG magnet 2a can be finely adjusted to maximize the output of the magnetoresistive element 5.

As shown in FIG. 2, the flexible substrate 7 having the output lead wire 7a of the magnetoresistive element 5 is bent in the through hole 3a of the stator side circuit substrate 3 and then the portion near the tip thereof is held by the holder. 4 is pressed and held in the vicinity of the soldering land 3b of the stator-side circuit board 3 by the pressing portion 4c of the lead wire 7a.
Are aligned and soldered with the corresponding soldering lands 3b. As shown in FIG. 3, the holding portion 4c of the holder 4 is provided with a recess for positioning the flexible substrate 7.

The output of the magnetoresistive element 5 is connected to the drive control circuit together with the wiring (flexible substrate, not shown) for driving the capstan motor after being relayed to the stator side circuit board 3.

Next, the assembling procedure will be described.

After tightening the screw 6 with the flexible board 7 positioned by the recess of the holder 4c of the holder 4 and soldering the lead wire 7a to the soldering land 3b, loosen the screw 6 a little to maximize the output of the magnetoresistive element 5. Adjust the position of the holder 4 so that, and finally tighten the screw 6 firmly.

The output flexible board 7 is the stator side circuit board 3
Since the holder 4 is bent and has slack in the through hole 3a, the holder 4 can be moved without difficulty.

[Effect of device]

As described above, in the mounting structure of the magnetic resistance element for FG of the present invention, the output of the magnetic resistance element is relayed to the stator side circuit board and connected to the control circuit together with the wiring for driving the motor. The wiring of the output flexible board can be easily performed without using a connector, etc., and the distance between the magnetoresistive element and the FG magnet can be easily fine-tuned during assembly. It is possible to eliminate the drawback of the conventional device that the distance between the magnetoresistive element and the FG magnet changes due to external force applied to the device.

[Brief description of drawings]

 1 ... Plan view of an embodiment of the present invention FIG. 2 ... Cross-sectional view taken along line II-II of FIG. 1 FIG. 3 Left side view 1 ... Capstan motor 2 ... Rotor, 2a ... FG magnet 3 ... Stator side circuit board 3a ... Through hole, 3b ... Soldering land 4 ... Holder, 4a ... Pin 4b ... Long hole, 4c ... Holding part 5 ... Magnetoresistive element, 6 ... Screw 7 ... Flexible board, 7a ... Lead line

Claims (2)

[Scope of utility model registration request] 1. In a motor for performing speed control by detecting a magnetic flux of an FG magnet provided on an outer peripheral surface of a rotor by a magnetic resistance element provided on a stator, an output of the magnetic resistance element by a holder to which the magnetic resistance element is fixed. For mounting the holder on the stator so that the tip of the flexible board can be pressed and held near the soldering land on the stator side circuit board for electrical connection and the distance between the magnetoresistive element and the FG magnet can be finely adjusted. The mounting structure for the FG magnetoresistive element. 2. The mounting structure for a magnetoresistive element for an FG according to claim 1, wherein the output flexible substrate of the magnetoresistive element is bent to have slack.