JPH1023727A - Capstan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a small-sized inexpensive motor by erectly mounting a second substrate mounted with a magnetoresistive element, which outputs a rotating speed signal on a first substrate holding a drive coil. SOLUTION: A rotating speed detecting magnet 4 is attached to the outer periphery of a rotor 3 rotatably faced to a drive coil 2 fixed on a first substrate 1 and a second substrate 9 fitted with a magnetoresistive elements 5 is erectly mounted on the first substrate 1 and electrically connected to the first substrate 1 by soldering. Therefore, a small-sized inexpensive capstan motor can be realized, because a space occupied by the magnetoresistive element 5 on a stator substrate and the number of parts can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a capstan motor used for video, audio equipment and the like.

[0002]

2. Description of the Related Art Conventionally, as a capstan motor used for a VTR or the like, a motor described in Japanese Utility Model Laid-Open No. 2-122579 is known.

FIGS. 9 and 10 show the structure of a conventional capstan motor, in which multi-pole magnetization is applied to the outer periphery of a rotor 3 rotatably facing a drive coil 2 fixed on a stator substrate 1. FIG. A rotation holder detecting magnet (hereinafter referred to as an FG magnet) 4 is mounted, and a mounting holder 6 on which a magnetoresistive element 5 is mounted on the stator substrate 1 is a screw 7.
Has been fixed by. The plurality of lead frames 8 connected to and pulled out from the magnetoresistive element 5 extend to the opposite side of the FG magnet 4 and are soldered to the stator substrate 1.

[0004] The conventional capstan motor is configured as described above, and the rotor 3 is rotated by a magnetic field generated by energizing the drive coil 2. The resistance value of the magnetoresistive element 5 changes due to the magnetic field magnetized on the FG magnet 4 that periodically changes with the rotation of the rotor 3,
A signal proportional to the rotation speed of the rotor 3 is detected using the change in the resistance value.

[0005]

In the above-mentioned capstan motor, in order to reduce the size and cost of the apparatus, a smaller and less expensive structure is required.

However, in the above-described conventional configuration, a mounting holder, screws, and a lead frame are required to fix the magnetoresistive element to face the FG magnet and connect it to the stator substrate. Since it occupies a lot of space and requires many parts, it has been a problem in realizing a small and inexpensive motor.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a small and inexpensive motor.

[0008]

In order to solve this problem, the present invention comprises mounting a magnetoresistive element for detecting a signal having a frequency proportional to the rotation speed of a rotor on a second substrate. The configuration is such that the substrate is mounted upright on the first substrate.

With this configuration, the space on the stator substrate can be reduced and the number of parts can be reduced, so that a capstan motor having a small and inexpensive magnetoresistive element can be realized.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention relates to a first substrate for holding a driving coil, a rotor having a multi-pole magnetized outer periphery and a rotation detecting magnet. A second substrate having a magneto-resistive element arranged at a position facing the magnet for detecting the rotation speed and outputting a rotation speed signal, wherein the second substrate is mounted upright on the first substrate. In addition, since the connection is made electrically, the space on the first substrate can be reduced and the number of components can be reduced, so that a capstan motor having a small and inexpensive magnetoresistive element can be realized. Having.

According to a second aspect of the present invention, the second substrate comprises:
The capstan motor according to claim 1, wherein the two-sided through-hole board is connected to the first board by soldering on a surface opposite to a mounting surface of the magnetoresistive element. Not only is it possible to obtain an inexpensive magnetoresistive element with a small number of parts, but it also requires high-resolution rotation detection, especially with a large number of multi-pole magnetized poles. When the adjustment is necessary, there is an effect that soldering can be easily performed from the surface of the second substrate opposite to the mounting surface of the magnetoresistive element after the adjustment of the gap.

According to a third aspect of the present invention, the second substrate comprises:
2. The capstan motor according to claim 1, wherein the single-sided substrate is connected to the first substrate by soldering on the same surface as the mounting surface of the magnetoresistive element. When rotation detection with a small number of magnetized poles and low resolution is sufficient, the gap between the magnetoresistive element and the rotation detection magnet is relatively large and does not need to be precisely adjusted. After soldering from the mounting surface side of the magneto-resistive element, the rotor can be inserted and opposed to each other. This has the function of realizing a capstan motor having a resistance element.

[0013]

1 to 8 show an embodiment of the present invention.
This will be described with reference to FIG.

(Embodiment 1) In FIGS. 1 and 2, a magnet 4 for detecting the number of rotations is mounted on the outer periphery of a rotor 3 rotatably facing a drive coil 2 fixed on a first substrate 1. The second substrate 9 having the magnetoresistive element 5 is mounted on the first substrate 1 in an upright state. The first substrate 1 and the second substrate 9 are connected by soldering and fixed. Have been.

FIGS. 3 and 4 are views showing an embodiment of a double-sided pattern of the second substrate 9 on which the magnetoresistive element 5 of the present invention is mounted, and the both-sided patterns are connected by through holes. The magnetoresistive element 5 is made of a ferromagnetic thin film such as permalloy on an insulating substrate such as glass.
The input / output terminals are connected to the second substrate 9 by soldering. The pattern connected to the surface on the opposite side of the second substrate 9 by the through hole extends to the contact surface with the first substrate 1.
It is connected to the above predetermined pattern by soldering.

(Embodiment 2) In FIGS. 5 and 6, a magnet 4 for detecting the number of rotations is mounted on the outer periphery of a rotor 3 rotatably facing a drive coil 2 fixed on a first substrate 1. The second substrate 9 having the magnetoresistive element 5 is mounted on the first substrate 1 in an upright state. The first substrate 1 and the second substrate 9 are connected by soldering and fixed. Have been.

FIGS. 7 and 8 show an embodiment of a single-sided pattern of the second substrate 9 on which the magnetoresistive element 5 of the present invention is mounted. The magnetoresistive element 5 is formed on an insulating substrate such as glass. It is made of a ferromagnetic thin film such as permalloy and usually has four input / output terminals. These input / output terminals are connected to the second substrate 9 by soldering. Second substrate 9 pulled out from the soldered portion of the input / output terminal of magnetoresistive element 5
This pattern is extended to a contact surface with the first substrate 1 and is connected to a predetermined pattern on the first substrate 1 by soldering.

In the above description, the example in which the input / output terminals of the magnetoresistive element 5 are four has been described.

[0019]

As described above, according to the present invention, the first magnetoresistive element is mounted on the second substrate, and the second substrate is mounted on the first substrate. An advantageous effect is obtained that the space and the number of parts on the substrate can be reduced, and a capstan motor having a small and inexpensive magnetoresistive element can be realized.

[Brief description of the drawings]

FIG. 1 is a plan view of a capstan motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the capstan motor according to the first embodiment of the present invention.

FIG. 3 is a view of a second substrate on which the magnetoresistive element is mounted according to the first embodiment of the present invention as viewed from a rotor side.

FIG. 4 is a view of the second substrate on which the magnetoresistive element is mounted according to the first embodiment of the present invention, as viewed from the side opposite to the rotor.

FIG. 5 is a plan view of a capstan motor according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a capstan motor according to a second embodiment of the present invention.

FIG. 7 is a view of a second substrate on which a magnetoresistive element is mounted according to the second embodiment of the present invention, as viewed from a rotor side.

FIG. 8 is a view of a second substrate on which a magnetoresistive element is mounted according to the second embodiment of the present invention as viewed from a side opposite to a rotor.

FIG. 9 is a plan view of a conventional capstan motor.

FIG. 10 is a sectional view of a conventional capstan motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st board | substrate 2 Drive coil 3 Rotor 4 Rotation speed detection magnet 5 Magnetoresistive element 9 2nd board | substrate

Claims (3)

[Claims] 1. A first substrate for holding a drive coil, a rotor having a multi-pole magnetized outer periphery for detecting a rotational speed, and a rotor disposed at a position facing the magnet for detecting the rotational speed. A second substrate having a magnetoresistive element for outputting a rotation speed signal, wherein the second substrate is mounted upright on the first substrate and electrically connected thereto. motor. 2. The second substrate is a double-sided through-hole substrate,
The capstan motor according to claim 1, wherein the capstan motor is connected to the first substrate by soldering on a surface opposite to a mounting surface of the magnetoresistive element. 3. The capstan motor according to claim 1, wherein the second substrate is a single-sided substrate and is connected to the first substrate by soldering on the same surface as the mounting surface of the magnetoresistive element.