JPH0721759A - Magnetic disk memory device - Google Patents

Abstract

PURPOSE:To reduce the thickness of the magnetic disk memory device to be used for various kinds of office automation equipment and apparatus. CONSTITUTION:A magnetic disk 12 is fixed to a spindle pulley 13 and transmits the driving power of a motor 8 via a belt 11 to a spindle pulley 13. A circuit board 14 controls driving of the motor 8. The region where the belt 11 of the circuit board 14 is arranged is provided with a notch 15. The circuit board 14 and the belt 8 are disposed on the same plane. The motor part is formed thin even if the height size of the coil and core of the motor 8 is not reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk storage device used in various office automation equipment.

[0002]

2. Description of the Related Art In recent years, along with thinning of various OA equipment, there has been a demand for thinning of magnetic disk storage devices.

Conventionally, this type of magnetic disk storage device has a structure as shown in FIGS. 4 and 5.
As shown in the drawing, the cup-shaped rotor 1 is locked to the shaft 2 at the center, and the cylindrical magnet 3 is locked to the inner wall of the rotor 1. The drive pulley 4 is attached to the other end of the shaft 2 that locks the rotor 1, and the rotor 1, the magnet 3, and the drive pulley 4 rotate about the shaft 2. A bearing 6 is locked to the core 5, and the shaft 6 supports the bearing 6.
Reference numeral 7 is a coil that gives a magnetomotive force when energized. The motor 8 is formed by the above configuration, and 9 is a circuit board for driving and controlling the motor 8, which is electrically connected to the coil 7 through the pin 10. The driving force of the motor 8 is transmitted to a spindle pulley (not shown) via the driving pulley 4 and the belt 11.

[0004]

However, in the above-mentioned conventional configuration, the height of the core 5 and the coil 7 must be shortened when the thickness is reduced, which reduces the area through which the magnetic flux passes and reduces the motor. There was a problem that the characteristics of No. 8 deteriorated.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a magnetic disk storage device which can be made thinner without deteriorating the characteristics of the motor.

[0006]

In order to solve the above problems, the present invention solves the above problems by a spindle pulley for rotating a magnetic disk, a motor for driving the spindle pulley via a belt, and a circuit board attached to the motor. The circuit board is provided with a notch in a region where the belt is arranged, and the rotating substrate and the belt are arranged on the same plane.

[0007]

As described above, since the rotary substrate and the belt are arranged on the same plane, it is possible to realize a thin structure without reducing the height of the core and the coil.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic disk storage device of the present invention will be described below with reference to one embodiment of FIGS. 1, 2 and 3. In addition,
In the present embodiment, the same components as those shown in the above-mentioned conventional example are designated by the same reference numerals, and the description thereof will be omitted. The characteristic configuration of the present embodiment is that a cutout is provided at a portion of the circuit board portion where the belt 11 is arranged as described in the conventional example.

That is, the magnetic disk 12 is fixed to the spindle pulley 13, the spindle pulley 13 is driven by the motor 8 via the belt 11, and the circuit board 14 is driven.
Is for controlling the motor 8 and is fixed to the motor 8.

A cutout 15 is provided in a region of the circuit board 14 where the belt 11 is arranged, and the circuit board 14 and the belt 11 are arranged on the same plane.

As described above, according to the magnetic disk storage device of the above embodiment, the notch 15 is provided in the area of the circuit board 14 where the belt 11 is arranged, and the circuit board 14 and the belt 11 are provided.
Are arranged on the same plane, the overall thickness can be reduced without thinning the core 5 and the coil 7 of the motor 8.

[0012]

As is apparent from the above embodiments, in the magnetic disk storage device of the present invention, a notch is provided in the area of the circuit board where the belt is arranged, and the circuit board and the belt are arranged on the same plane. With this configuration, the product can be made thinner without reducing the height dimensions of the core and the coil.

[Brief description of drawings]

FIG. 1A is a plan view of an embodiment of a magnetic disk storage device of the present invention. FIG. 1B is a side view of the same.

FIG. 2 is a cross-sectional view of a motor unit of the magnetic disk storage device.

FIG. 3 is a plan view of a motor portion, which is the main part of the same.

FIG. 4 is a cross-sectional view of a motor unit of a conventional magnetic disk storage device.

FIG. 5 is a plan view of a motor section, which is the main part of the same.

[Explanation of symbols]

 8 Motor 11 Belt 12 Magnetic Disk 13 Spindle Pulley 14 Circuit Board 15 Notch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiharu Motobo 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A region of the circuit board in which the belt is arranged, comprising a spindle pulley for rotating a magnetic disk, a motor for driving the spindle pulley via a belt, and a circuit board attached to the motor. A magnetic disk storage device in which a circuit board and a belt are arranged on the same plane while a cutout is provided in the.