JPS61199269A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To make a device small-sized and inexpensive by activating or inactivating a brake member, which is brought into contact with the spindle of a motor to stop quickly the motor, and a lock member, which detains the movement of a carriage, simultaneously with the sane solenoid. CONSTITUTION:A direct drive motor spindle 2 is provided on a substrate 1, and two discoid mediums 3 where information is recorded and reproduced are fixed to the shaft of this spindle 2. A carriage 4 which is moved linearly in the radial direction of said mediums 3 is provided on the substrate 1. A brake plate is brought into contact with the peripheral surface of an outer cylinder projected under the substrate 1 of the spindle 2. When a solenoid 10 is deenergized, the brake plate 8 presses the outside peripheral surface of the spindle 2 by the energizing force of the spindle 13 to brake the spindle 2. In this case, the spindle 2 is braked and the carriage 4 is locked simultaneously by the same solenoid 10; and therefore, this device is advantageous with respect to space and is made small-sized and inexpensive.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device that can brake the rotation of a motor and lock the movement of a carriage with a small and simple structure.

[Technical Background of the Invention] Currently, magnetic disk devices that record or reproduce information through a magnetic head by rotating a disk at high speed are widely used because of their small size, lightness, and ease of operation. This magnetic disk drive is usually equipped with a spindle brake that suddenly stops the rotation of the spindle of a direct drive motor that rotates the disc at high speed, and the magnetic head, which moves linearly in the radial direction of the disc. A carriage lock is provided for locking movement of the carriage. Previously, separate solenoids were used to deenergize and energize the spindle brake and carriage lock.

[Problems with the Background Art] In the conventional magnetic disk drive configured as described above, separate solenoids are used to operate the spindle brake and carriage lock, which is wasteful in terms of space and cost. Therefore, there was a problem in that it was disadvantageous in making the magnetic disk device inexpensive and compact.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a small, lightweight, and inexpensive magnetic disk device.

[Summary of the Invention] The present invention includes a brake member that suddenly stops a motor that rapidly rotates a disk mounted on a magnetic disk device and that records and reproduces information, and a magnetic head that records and reproduces information on the disk. The locking member that locks the movement of the mounted carriage that moves in the radial direction of the disk is configured to be simultaneously deenergized or energized by the same solenoid.

According to the above-mentioned configuration, the brake member and the lock member, which were conventionally deenergized or energized by separate solenoids, now need only one solenoid, which simplifies the structure and provides a compact and inexpensive magnetic disk device. can do.

[Embodiment of the Invention] Hereinafter, an embodiment of a magnetic disk device according to the present invention will be described with reference to the drawings.

FIGS. 1, 2, and 3 are a top plan view, a sectional view, and a bottom plan view, respectively, showing an embodiment of the present invention. A direct drive motor spindle 2 is provided on the substrate 1, and two disc-shaped media 3 for recording and reproducing information are fixedly attached to the shaft of the spindle 2. A carriage 4 is provided on the substrate 1 and moves linearly in the radial direction of the medium 3 via an access mechanism and guide means (not shown). A head 6 is attached to face the media 3. A toothed portion 4a is formed on one side surface of the carriage 4 parallel to the moving direction. A brake plate 8 is in contact with the circumferential surface of the outer cylinder of the spindle 2 that protrudes from the bottom of the base plate 1 through a wear-preventing tip 7, and this brake plate 8 is attached to a shaft 1ffU attached to the base plate 1. It is rotatably supported by 9. Further, a solenoid mounting plate 11 for fixing the solenoid 10 is fixedly installed on the lower surface of this substrate 1, and the axis of the plunger 108 of the solenoid 10 is aligned with the radial direction of the media 3 on this solenoid mounting plate 11. Solenoids 10 are installed to match. A shaft 12 is provided near the protruding end of the plunger 10a, and the plunger 10a and near one end of the brake plate 8 where the tip 7 is provided are rotatably connected via this shaft 12. . Between a part of the solenoid mounting plate 11 and one end of the brake plate 8 on the side opposite to the shaft 12 with respect to the shaft 9, the brake plate 8 is pressed against the circumferential surface of the spindle outer cylinder via the tip 7. Spring 1 for biasing
3 is suspended. A bearing 14 is formed on the upper surface of the substrate 1 near the carriage 4, and this bearing 14
A lock plate 16 is rotatably supported via a shaft 15. One end of this lock plate 16 is connected to the shaft 12.
The end opposite to the shaft 15 is connected to a spring 17 whose one end is fixed to the base plate 1 and biased counterclockwise in the figure. A locking plate 18 having a hook 18a formed at the tip is fixed to one end of the shaft 15 protruding from the upper surface of the substrate 1 via a bearing 14, and these shafts 15 and the locking plate 18 are connected to the locking plate 18. It is designed to rotate integrally with the plate 16 by a bearing 14. A hook 18a formed on the locking plate 18 is formed so as to be able to engage with and disengage from a toothed portion 4a formed on the side surface of the carriage 4.

The operation of this embodiment configured as described above will be described below. 1, 2, and 3 show the state of the solenoid 10 when it is deenergized, viewed from the top, side, and bottom, respectively, and FIGS. 4 and 5 show the state when the solenoid 10 is energized. The state shown is shown from above and below, respectively.

When the solenoid 10 is deenergized, the brake plate 8 is urged to rotate clockwise about the shaft 9 by the urging force of the spring 13, and the tip 7 provided on the brake plate 8 touches the outer peripheral surface of the spindle 2. The brakes are applied by pressing . At the same time, the lock plate 16 is also urged to rotate counterclockwise about the shaft 15 by the urging force of the spring 17, and the hook 18a is moved to the toothed portion 4a of the carriage 4.
The movement of the carriage 4 is locked. At this time, rotation of the motor spindle 2 is stopped.

When the solenoid 10 is energized, the brake plate 8 rotates counterclockwise about the shaft 9 against the biasing force of the spring 13, and the tip 7 separates from the outer circumferential surface of the outer cylinder of the spindle 2, and the brake is activated. It will be canceled. At the same time, the lock plate 16 rotates clockwise about the shaft 15 against the urging force of the spring 17, and the hook 18a separates from the toothed portion 4a formed on the carriage 4, and the lock is released.

As described above, according to this embodiment, the brake of the spindle 2 and the lock of the carriage 4 can be simultaneously performed by the same solenoid 10 via the brake plate 8 and the lock plate 16, respectively, so that they cannot be braked separately as in the conventional case. There is no need to provide a solenoid, which is advantageous in terms of space and can be downsized, and the magnetic disk device can also be made inexpensive.

In the above-described embodiment, a case has been described in which there are two media 3, but the number of media is not limited to two.

E. Effects of the Invention] As described above, according to the present invention, the brake member of the motor spindle of the magnetic disk drive and the locking member of the carriage are simultaneously actuated by the same solenoid. It has become possible to make it small and inexpensive.

[Brief explanation of drawings]

1 is a top plan view of a magnetic disk drive according to an embodiment of the present invention in a state in which the solenoid is deenergized, as seen from above; FIG. 2 is a sectional view taken along line AA in FIG. 1; and FIG. FIGS. 4 and 5 are plan views of the embodiment of the present invention when the solenoid is energized, as seen from the top and bottom, respectively. 1... Board 2... Motor spindle 3
...Media 4...Carriage 4a...
Tooth section 6...Magnetic head 8...Brake plate 10...Solenoid 16...Lock plate
18...Latching plate 18a...Hook agent Patent attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1) A magnetic disk rotated at high speed by a motor, and a carriage mounted with a magnetic head for recording and reproducing information on the magnetic disk and moving linearly in the radial direction of the magnetic disk. A brake member that comes into contact with the spindle of the motor to suddenly stop the motor;
A magnetic disk drive characterized by comprising: a locking member that locks movement of the carriage; and a solenoid that simultaneously deenergizes or energizes the brake member and the locking member. 2) The magnetic disk drive according to claim 1, wherein the locking member is provided with a hook that engages with a toothed portion formed on a portion of the carriage.