JPH07114539B2 - motor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing unnecessary vibration of a motor of electronic drive means.

[0002]

2. Description of the Related Art Conventionally, a drive circuit for a brushless motor or the like has been formed on an iron substrate, and the iron substrate has been used as a stator yoke of the motor to miniaturize the device. FIG. 2 is a structural view of a conventional brushless motor, in which a motor drive coil 2'is provided on an iron plate 1'as a stator yoke, and an electronic circuit component 3'such as an IC is mounted on it. A rotor magnet 4'is rotatably supported by a bearing 5'fixed to an iron plate 1 ', and supported by a rotating shaft 6'.

[0003]

However, when such a motor is used in a precision device of an optical disc device such as a compact disc reproducing device, the iron plate 1'of the stator yoke vibrates due to the vibration of the rotor magnet 4'and the magnetic field of the motor. When the disc is reproduced, the vibration is seriously affected by the tracking error signal of the optical pickup, which adversely affects the reproduction.

Further, in order to miniaturize the device, circuits other than the motor drive circuit such as a disc reproducing circuit are mounted on the iron substrate.
When a servo circuit or the like is to be arranged, it is difficult to arrange parts on the upper and lower surfaces of the board because they are iron boards and connect them with through holes etc. like a normal epoxy board. Since it is arranged, the substrate becomes large and it is difficult to miniaturize the device.

The object of the present invention is to integrate a mechanical substrate (iron substrate) such as a motor drive unit used in an optical disk device or the like and to improve the vibration resistance of the substrate.

[0006]

The present invention is a motor in which a resin material is provided between a plurality of iron substrates, the iron substrates are used as a part of a magnetic circuit of a driving means, and a support shaft is integrally molded. Further, the present invention is a motor having means for providing a vibration loss by providing a cavity between a plurality of iron substrates. Further, the present invention is a motor in which through holes are provided between a plurality of iron substrates, and electronic circuits provided on the iron substrates are connected to each other by wiring through the through holes and connected by wires. Further, according to the present invention, the first iron substrate constitutes a part of the magnetic circuit, the second iron substrate prevents magnetic flux leakage, and the electronic circuit provided on the second iron substrate prevents noise generation due to magnetic flux change. It is a motor configured in this way.

[0007]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention. To describe a motor as an example of the electronic drive unit, the iron plate 1
A coil 2 for driving a motor and other electronic circuit components 3 provided on the upper surface of the above so as to face the rotor magnet 4 are connected by a printed wiring pattern 3a provided on the insulating layer 10 to form an iron substrate.

On the other hand, like the iron plate 1, the electronic circuit component 3 is also provided on the lower surface of the other iron plate 9 via the insulating layer 11 and the wiring pattern 3b.
On the surface, the wiring of each other is made. The iron plate 1 and the iron plate 9 have a resin layer 7 with a space d and are provided with a resin bearing 5 made of a resin such as polyacetal resin, through holes 8 for wiring the upper and lower portions, and cavities 7a to 7n for filling a vibration-proof resin. Are integrally molded.

A wiring 12 is formed between the integrally formed wiring patterns 3a and 3b through a through hole to form a resin bearing 5
When the rotating shaft 6 of the rotor magnet 4 is inserted into the rotor magnet 4, the motor driving coil 2 and the rotor magnet 4 face each other and are rotatably held. A chuck for mounting a compact disk (not shown) is integrally formed on the rotor magnet 4 in a thin shape.

When the electronic circuit is energized, a magnetic field is generated from the motor driving coil 2 to form a magnetic path for driving the rotor magnet 4 using the iron plate 1 as a stator yoke. The magnetic field causes the rotor magnet 4 to rotate about the rotation shaft 6.

When the rotor magnet 4 rotates, the bearing 5 and the iron plate 1 vibrate due to a shake or magnetic field fluctuation, and the vibration is transmitted to a support portion of a compact disc or an optical pickup (not shown) to cause an error in signal detection. Iron plate 9 provided
Since the vibration is absorbed by the internal loss of the resin, the iron vibration due to the magnetic field fluctuation is dispersed in the iron plate 1 and the iron plate 9 and reinforced with each other, so that the vibration damping effect is great.

Further, the iron plate 9 is provided in the electronic circuit section below the iron plate 9.
Since it blocks the fluctuating magnetic field from the motor, noise can be reduced. Further, the vibration absorption amount can be increased by press-fitting rubber or the like having a large internal loss into the hollow portions 7a to 7n provided between the iron plate 1 and the iron plate 9 provided at the time of integral molding.

Although the amount of vibration can be reduced by making the iron plate thick, the vibration damping effect can be increased relative to the weight of the iron plate in order to make it small and lightweight. Moreover, the connection between the upper and lower surfaces can be made through the through hole 8.
It is configured to hold the iron plate 1 and the iron plate 9 via.
Therefore, the iron plate and the resin have a sandwich structure, and also function to damp vibrations of electronic circuit parts and wiring patterns. By adopting such a configuration, it is possible to improve the mounting density of the substrate and damp vibrations.

[0014]

EFFECTS OF THE INVENTION Since the iron plate of the magnetic field path having the electromagnetic drive portion is spaced apart from the other iron plate and is integrally molded with resin, the vibration damping effect is enhanced and the vibration damping effect is also obtained by the wiring circuit parts. You can

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a diagram showing a conventional example.

[Explanation of symbols]

 1,9 Iron plate 2 Coil 3 Electronic circuit component 4 Rotor magnet 5 Bearing 6 Rotating shaft 7 Resin layer 7a to n Cavity 8 Through hole 10, 11 Insulating layer 12 Wiring

Claims (4)

[Claims] 1. A driving said holds the distance by disposing the resin material between a plurality of iron substrates that make up the magnetic circuit of the drive means
Motor, characterized in that the integrally formed a bearing portion of the member driven by the motion means in the resin material. 2. A vibration loss is provided by providing a cavity between a plurality of iron substrates.
Motor according to claim 1, characterized in that it comprises means you attenuating loading oscillates large member. 3. A resin wall is integrally molded into the holes of a plurality of iron substrates.
Provide an insulated through hole and place it on the iron substrate.
Motor according to claim 1, wherein the location electronic circuit is characterized in that connected to each other through the through hole. 4. The first iron board constitutes a part of the magnetic circuit of the motor , the second iron board prevents magnetic flux leakage, and the electronic circuit provided on the second iron board generates noise due to a change in magnetic flux. The motor according to claim 1, wherein the motor is prevented.