JPH04149876A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To prevent operation from being forgotten by providing this magnetic disk device with a solenoid for operating a plunger for braking a carriage and a carriage unlocking circuit for driving the solenoid by a carriage unlocking signal outputted from a master device. CONSTITUTION:At the time of confirming that a carriage unlocking signal S3 outputted from the master device is activated when an identification(ID) number coincidence signal S2 is active, the carriage unlocking circuit 3 activates a signal S4 to be applied to the solenoid 4. When the solenoid 4 is driven, the plunger 5 is separated from the carriage 6. When the signal S3 from the device is inactivated, the circuit 3 inactivates the signal S4 to be applied to the solenoid 4. When the signal S4 is inactivated, the solenoid 4 aborts the pulling of the plunger 5 and presses and suppresses the carriage 6. Consequently, manual operation can be made unnecessary.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a magnetic disk device.

[Conventional technology]

In conventional magnetic disk drives, contact-start
A stop type <CSS type) magnetic head is used. In this type of magnetic head, when the magnetic disk device is stopped, that is, when the rotation of the magnetic disk medium is stopped, the magnetic head and the magnetic disk medium are in contact with each other. When the magnetic disk drive is started and the magnetic disk medium begins to rotate, and when the magnetic disk drive is stopped, the magnetic head is sliding on the magnetic disk medium. Furthermore, when the rotation speed of the magnetic disk medium increases and the relative speed between the magnetic head and the magnetic disk medium exceeds a certain value, the magnetic head begins to fly above the magnetic disk JII body, but the flying height is 0.2-0.4μm
And very small.

If the magnetic head and magnetic disk medium come into contact for some reason while the magnetic disk medium is rotating at high speed,
Damage may occur to the magnetic head or magnetic disk medium. If such damage occurs to the magnetic disk medium, even if only slightly, the magnetic head will not be able to fly over the damaged area and will continue to slide over the damaged area of the magnetic disk medium, resulting in the occurrence of damage caused by the damage. scattering dust. Furthermore, the damage to the magnetic disk medium is extended to the periphery, and the magnetic head is also damaged.

Eventually, it becomes impossible to write information to or read information from the magnetic disk medium, which can have a serious impact on the system. It may be harmful.

As mentioned above, the magnetic head slides against the magnetic disk medium when the magnetic disk medium rotates and stops, but during the normal sliding operation of the magnetic head, unless there is any abnormality in the magnetic head or magnetic disk medium, the magnetic head will slide against the magnetic disk medium. No damage occurs to the media. However, due to the carriage working when the magnetic disk medium is stopped, damage may occur to the magnetic head attached to the tip of the carriage and the magnetic disk medium. Although the carriage does not move on its own during normal operation of a magnetic disk drive, the carriage may sometimes move due to vibrations or the like during transportation of the magnetic disk drive. For this reason, the magnetic disk drive is provided with a carriage stopping mechanism to prevent the carriage from moving during transportation.

As shown in FIG. 3, a conventional magnetic disk device has a magnetic head 7 that holds stored information on a recording surface of a magnetic disk medium 13 that stores information by a carriage 6 and positions it at a predetermined position. A head disk assembly (hereinafter referred to as HDA) 30 is housed in a sealed container 9 and performs reading and writing. The carriage lock mechanism 20b penetrates the sealed container 9 and has one end connected to the HD.
The carriage 6 is held down by pushing down a carriage lock bar 10 whose other end reaches the carriage 6 under the carriage lock bin 14 provided on the outer wall of the sealed container 9 of A30. In this manner, when moving or transporting the HDA 30 or the magnetic disk device equipped with the HDA 30, the carriage 6 is locked to prevent damage to the magnetic disk medium 13 and the magnetic head 7. When using the magnetic disk device, the carriage 6 is unlocked by pushing up the carriage lock bar 10 above the carriage lock bin 14 in advance.

[Problem to be solved by the invention]

In the conventional magnetic disk drive described above, the movement of the carriage 6 inside the HDA 30 is restricted or freed by manually operating the carriage lock bar 10, so there is a problem that the order of operations may be incorrect or the operation may be forgotten. There is.

An object of the present invention is to provide a magnetic disk device that does not require manual operation and can prevent erroneous operations or forgetting operations.

[Means to solve the problem]

A magnetic disk device of the present invention includes a magnetic disk medium for storing information, a magnetic head for reading and writing information on the magnetic disk medium, and a magnetic head for holding the magnetic head at a predetermined position on the magnetic disk medium. A magnetic disk drive having a carriage for positioning the carriage, comprising a solenoid for operating a plunger for stopping the carriage, and a carriage lock release circuit for driving the solenoid in response to a carriage lock release signal from a host device. .

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention. This embodiment shows the carriage lock mechanism 2 of the conventional HDA30.
0b is replaced with a carriage lock mechanism 20a. The carriage locking mechanism 20a includes a solenoid 4 that operates the 1-lunger 5, an identification number matching detection circuit 2 that compares the identification number S1 from the host device 1 with a pre-stored identification number, and an identification number matching detection circuit 2. The carriage lock release circuit 3 is configured to drive a solenoid 4 with a carriage lock release instruction signal S4 based on an identification number matching signal S2 from the host device 1 and a carriage lock release signal S3 from the host device 1.

FIG. 2 is a sectional view of an HDA using the same embodiment. In the figure, solenoid 4 of carriage lock mechanism 20a
Only the plunger 5 and the plunger 5 are shown, and the others are omitted. The plunger 5 penetrates the sealed container 9 and always stops the carriage 6. The solenoid 4 is connected to the end of the plunger 5 on the opposite side of the carriage 6, and when driven, pulls the plunger 5 away from the carriage 6.

Next, the operation of this embodiment will be explained using FIG. 1 and FIG. 2. Identification number - Several sheet output circuit 2 is upper bag w1
When the identification number S1 is received from the carriage lock release circuit 3, it is compared with a pre-stored identification number and if they match, it activates an identification number matching signal S2 to the carriage lock release circuit 3. Next, the carriage lock release circuit 3
When it is confirmed that the carriage lock release signal s3 from the host device 1 has become active while the identification number matching signal S2 is active, the carriage lock release instruction signal S4 is activated to the solenoid 4. The solenoid 4 is activated when the carriage lock release instruction signal S4 becomes active. When the solenoid 4 is driven, the plunger 5 is pulled by the solenoid 4 and separated from the carriage 6. In this way, the carriage lock release signal S3 from the host device 1 releases the carriage 6 from the plunger 5, and the magnetic disk device becomes ready to start.

In addition, a carriage lock release signal S3 from the upper bag f1
When becomes inactive, the carriage lock release circuit 3 makes the carriage lock release instruction signal S4 inactive to the solenoid 4. The solenoid 4 stops pulling the plunger 5 when the carriage lock release instruction signal S4 becomes inactive. When the plunger 5 is no longer pulled by the solenoid 4, it presses and stops the carriage 6.

〔Effect of the invention〕

As explained above, the present invention has the advantage that by unlocking the carriage using the identification number from the host device and the carriage lock release signal, there is no need for manual wj operations and it is possible to prevent erroneous operations or forgetting operations. There is.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a sectional view of an HDA using the same embodiment, and FIG. 3 is a sectional view of a conventional example. 1... Host device, 2...-Identification number match detection circuit, 3... Carriage lock release circuit,
4... Solenoid, 5...- Plunger, 6-... Carriage, 9... Sealed container, 20a... Carriage lock mechanism, 30・
...-HDA, Sl...Identification number, S2.
. . . Identification number match signal, S3 . . . Carriage lock release signal, S4 . . . Carriage lock release instruction signal. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Claims] A magnetic disk medium that stores information, a magnetic head that reads and writes information to the magnetic disk medium, and a carriage that holds the magnetic head and positions it at a predetermined position on the magnetic disk medium. What is claimed is: 1. A magnetic disk device comprising: a solenoid for operating a plunger for stopping the carriage; and a carriage lock release circuit for driving the solenoid in response to a carriage lock release signal from a host device.