JPH0477362B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a write circuit used in a magnetic storage device capable of storing and reproducing information signals.

[Conventional technology]

FIG. 3 is a diagram showing an example of the configuration of a conventionally used write circuit of this type. In the same figure, 1
is a read/write head with a center tap, 2 is a degaussing head, 3 is a center tap voltage source that determines the center tap potential, and 4 is a read/write head.
A write current drive circuit drives the write head 1, 5 is a write current source, 6 is a degaussing current source, and 7 is a write signal input terminal.

Next, the operation of the conventional magnetic storage device write circuit shown in FIG. 3 will be described. First, an input signal input from the write signal input terminal 7 enters the write current drive circuit 4, switches the constant write current from the write current source 5, and supplies the current to either the left or right coil of the read/write head 1. to write signals onto a magnetic storage medium. The center tap voltage of the read/write head 1 at this time is provided by the center tap voltage source 3. Further, in order to prevent interference between tracks of the magnetic storage medium at the same time as writing, a constant current is supplied from the demagnetizing current source 6 to the demagnetizing head 2 for demagnetization.

[Problem that the invention seeks to solve]

Since the conventional write circuit for a magnetic storage device is configured as described above, it requires a write current source and a degaussing current source, respectively, resulting in problems such as increased current consumption.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a write circuit for a magnetic storage device with low power consumption.

[Means for solving problems]

A write circuit for a magnetic storage device according to the present invention includes a write/demagnetize current source that is shared for write and demagnetize.

[Effect]

In the write circuit for a magnetic storage device according to the present invention, writing and demagnetization are simultaneously performed using one constant current source.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention. The same parts as in FIG.
It is characterized in that a write/demagnetize current source 8 is provided instead of.

Next, the operation of the magnetic storage device write circuit of this embodiment will be explained. First, an input signal input from the write signal input terminal 7 enters the write current drive circuit, switches the write constant current from the write/consumption current source 8, and supplies current to either the left or right coil of the read/write head 1. Although not shown in the figure, signals are written to the magnetic storage medium. Read/write head 1 at this time
The center tap voltage is provided through the degaussing head 2 from the center tap voltage source 3. Also,
In order to prevent interference between tracks of the magnetic storage medium at the same time as writing, writing and writing are performed via the write current drive circuit 4 and the read/write head 1.
Demagnetization is performed by flowing a constant current from a demagnetization power supply 8 to the demagnetization head 2.

In the above embodiment, the degaussing head 2 is directly connected to the center tap of the read/write head 1, but as shown in FIG. A center tap voltage source 3 may be connected between the two and the same effect as in the above embodiment can be obtained.
In addition, in FIG. 2, 9 is a voltage source.

〔Effect of the invention〕

As described above, according to the present invention, since the same current source is shared for writing and demagnetization, the number of current sources can be reduced and power consumption can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of this invention, FIG. 2 is a block diagram showing another embodiment of this invention, and FIG. 3 is a block diagram showing another embodiment of this invention.
The figure is a configuration diagram showing a conventional example. DESCRIPTION OF SYMBOLS 1... Read/write head, 2... Demagnetize head, 3... Center tap voltage source, 4... Write current drive circuit, 7... Write signal input terminal, 8... Write/demagnetize current source.

Claims (1)

[Claims] 1. In a magnetic storage device having a function of storing and reproducing information signals, a read/write head having a center tap, a degaussing head, a center tap voltage source that determines the potential of the center tap of the read/write head; A write current drive circuit that drives a read/write head, and a write/demagnetize current source that supplies a write current to the read/write head and a degauss current to a demagnetize head via the write current drive circuit. A write circuit for a magnetic storage device characterized by: