JPH01300481A - Carriage locking mechanism for magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent magnetic powder from being diffused in a disk enclosure by arranging the plunger of a solenoid arranged outside a base plate in the base plate after passing through a hole provided at the base plate, and providing a rubber seal between the hole and the plunger. CONSTITUTION:The solenoid 7 is provided outside the base plate 5, and the plunger 8 of the solenoid is extended in the base plate 5 via the hole 5a provided at the base plate 5, and a carriage 3 is locked by engaging a projection 8a with a locking hole 4a formed on a coil bobbin 4. Also, the rubber seal 9 of bellows shape is provided between the hole 5a and the plunger 8, and the plunger 8 is raised by the elasticity of the seal. In such a way, it is possible to prevent the magnetic powder from being diffused in the disk enclosure at the time of operating the solenoid 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application J] The present invention relates to a magnetic disk drive, and particularly to a carriage lock mechanism thereof.

[Prior Art] In general, a magnetic disk drive has a plurality of magnetic disks stacked and mounted on one spindle, which is rotated steadily by a spindle motor, and is mounted facing the storage surface of the magnetic disk. The structure is such that information is written and read by positioning the magnetic head on a designated track of a magnetic disk using a carriage equipped with a magnetic head.

In order to improve the storage density of recent magnetic disk devices, when the magnetic disk is not rotating, the magnetic head is brought into contact with the corresponding storage surface of the magnetic disk and stopped.
A method of writing and reading information by keeping a fixed distance between the disk and the storage surface of the magnetic disk by floating the disk using the airflow generated by the rotation of the disk.
The so-called contact start-stop method (CSS)
method) is adopted.

In such a C8S type magnetic disk device,
A specific area on the magnetic disk for contacting and stopping the magnetic head (hereinafter referred to as the CSS zone) is located outside the area for writing and reading information (hereinafter referred to as the R/W zone) (inner circumference side or on the outer circumferential side), and performs information writing and reading operations (hereinafter referred to as R/W operation).
When the magnetic head is finished, return the magnetic head to the C8S zone, stop the rotation of the magnetic disk, and return the magnetic head to the R
Damage to the magnetic disk storage surface due to contact with the magnetic disk and stopping in the /W zone (so-called head
Measures have been taken to prevent crashes.

However, if there is no means to restrain the magnetic head while it is stationary in the C8S zone, if the magnetic disk drive is transported or moved, an impact force will be applied to the magnetic disk drive and the magnetic head will be damaged. may move while in contact with the magnetic disk, resulting in scratches and damage to the storage surface.

As a means to solve this problem, a locking mechanism is provided to prevent the magnetic disk and the magnetic head from moving relative to each other.

Conventional locking mechanisms include a manual operation method and an electric operation method using a solenoid mechanism or the like. The manually operated locking structure locks the carriage section and the spindle section via a link mechanism. In addition, with electrically operated lock structures, there are those in which the solenoid is mounted inside the DE (disk enclosure), and those in which the solenoid is mounted inside the DE (disk enclosure).
Some have the solenoid mounted outside, but some have the solenoid mounted inside the DE, and the magnetic powder when the solenoid operates is D.
The solenoid is surrounded by permalloy or the like to prevent it from diffusing into E. Further, those in which the solenoid is mounted outside the DE have a structure having a link mechanism.

[Problems to be Solved by the Invention] The above-described conventional carriage lock mechanism has problems such as forgetting to lock it when operated manually.

In addition, the electric operation method has the disadvantage that the structure is complicated and the cost is high because it has a permalloy and a link mechanism surrounding the knob and the nod.

[Means for Solving the Problems] A carriage lock mechanism of a magnetic disk device of the present invention that solves the above-mentioned conventional problems includes at least one magnetic disk attached to a main shaft rotated by a motor, and at least one magnetic disk. In a magnetic disk drive having a head, a carriage for positioning the magnetic head on a predetermined track of the magnetic disk, and a solenoid for locking the carriage, the solenoid is disposed outside the base plate of the magnetic disk drive, and the solenoid is arranged outside the base plate of the magnetic disk drive. The plunger is disposed in the base plate through a hole provided in the base plate, and a rubber seal is provided between the hole and the plunger.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of one embodiment of the present invention.

The magnetic disk 1 is attached to a base plate 5 via a spindle (not shown), and the magnetic head 2 is mounted on the tip of a carriage 3 attached to the base plate 5. The magnetic head 2 moves over the magnetic disk 1 in the AB force direction together with a carriage 3 by a voice coil motor comprising a coil bobbin 4 and a magnetic circuit 6.

In the carriage lock mechanism of this embodiment, as shown in FIG. It extends within 5.

A protrusion 8a is provided at the tip of the plunger 8, and the carriage 3 is locked by fitting this protrusion 8a into a lock hole 4a formed in a coil bobbin 4 that is integrally attached to the carriage 3. It is like that.

Further, a bellows-shaped rubber seal 9 is provided between the hole 5a and the plunger 8 as shown in the figure, and the plunger 8 is pushed up by the elasticity of the rubber seal 9.

Figure 2 shows solenoid 7 and plunger 8 when the power is turned on.
, shows the positional relationship of the rubber seal 9. When the solenoid is powered on, the plunger 8 moves toward the solenoid 7 body, and the carriage 3 is unlocked by the plunger 8.

Figure 3 shows solenoid 7 and plunger 8 when power is cut off.
, shows the positional relationship of the rubber seal 9. When the power is cut off, the solenoid 7 loses its ability to hold the plunger 8. Therefore, the plunger 8 is pushed up by the elastic deformation of the rubber seal 9, and the coil bobbin 4 is locked.

[Effects of the Invention] As explained above, the carriage lock mechanism of the magnetic disk device of the present invention includes at least one magnetic disk attached to the main shaft rotated by a motor, at least one magnetic head, and the magnetic disk drive. In a magnetic disk drive having a carriage for positioning a head on a predetermined track of the magnetic disk, and a solenoid for locking the carriage, the solenoid is disposed outside the base plate of the magnetic disk drive, and the plunger of the solenoid is attached to the base plate. By disposing the solenoid in the base plate through a hole provided in the DE and by providing a rubber seal between the hole and the plunger, magnetic powder from the solenoid does not diffuse into the DE, improving reliability.

Furthermore, since the structure is simple, there is also an effect of reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a partial sectional view when the carriage is unlocked, and FIG. 3 is a partial sectional view when the carriage is locked. 1: Magnetic disk 2: Magnetic head 3: Carriage 4: Coil bobbin 5: Base plate 6: Magnetic circuit 7: Solenoid
8 Ni lunger 9: Rubber seal

Claims (1)

[Claims] At least one magnetic disk attached to a main shaft rotated by a motor, at least one magnetic head, a carriage for positioning the magnetic head on a predetermined track of the magnetic disk, and a solenoid for locking the carriage. In the magnetic disk device, the solenoid is disposed outside the base plate of the magnetic disk device, the plunger of the solenoid is disposed inside the base plate through a hole provided in the base plate, and a rubber seal is provided between the hole and the plunger. A carriage lock mechanism for a magnetic disk device characterized by: