JPS6364602A - Floppy disk drive - Google Patents

Abstract

PURPOSE:To reduce signals left unerased without raising saturated magnetic flux density Bs of a head core by providing a record signal delay circuit for interval of gaps, providing two head gaps in a read write head, and making the two gaps record the same signal at the same point of medium. CONSTITUTION:Two read/write gaps 101, 102 are provided in a head. A delay circuit 108 is provided together with an erase gap 103, a ferrite 104, a slider 105, a coil 106 and a gimbals 107, and signals are sent from a read/write circuit 109 to two heads 113 simultaneously. The delay time of the delay circuit 108 is set according to the interval of the two head gaps 101, 102. The recording is made by two heads, and the reproducing is made by a head positioned in the rear.

Description

[Detailed Description of the Invention] [Industrial Application Field] A read/write head that overwrites a recorded magnetization pattern, an erase head that erases the surrounding magnetization pattern, and a stepper drive circuit/stepper that positions the head. The present invention relates to a floppy disk drive whose main components include a spindle drive circuit and a spindle motor for rotating a magnetic recording medium.

[Conventional technology]

The magnetic head used in a conventional floppy disk drive is shown in Fig. 2 (α), and the block diagram of the drive is shown in Fig. 2 (h).
As shown in Figure 2 (α) 2o1, there is only one read/write gap, and the circuit components do not include a memory for temporarily storing recording signals. [Problems to be solved] Recently, the recording density of 70p discs has improved significantly. (
Nikkei Electronics May 5, 1986 issue F.
123, etc.) Accordingly, the Ha of recording media has increased. For example, 3,5 //In a floppy disk, increase the recording capacity to 500 bytes/side to 1MB/
Ha was raised from 6250e to 7200e to bring it up to the surface. In addition, Piteofloppy uses metal powder as magnetic particles to raise Hc to 10,000e or more.

When Ha increases in this way, when overwriting is performed, the previously written signal may not be erased sufficiently and may remain. This is particularly noticeable when a head with a small saturation magnetic flux density (Bs) is used. Bs small Mz due to ease of head core processing and cost issues.
It is difficult to use Herad cores other than Zn7 Elite, so there is a problem with erasure C: poor override characteristics)
has become a big problem.

An object of the present invention is to solve the above problem without increasing the Bs of the head core.

[Means for Solving the Problems] In the floppy disk drive of the present invention, the read/write head has two head gaps, the two heads are arranged on the same track, and the two gaps at the same point on the medium transmit the same signal. For this purpose, the circuit section includes a recording signal delay circuit corresponding to the two gap intervals.

[Effect]

The residual signal components are mainly the signals written last time, and the components of the previous signals are insignificant. If you make the signal you wrote last time the same as the signal you wrote this time, there will be virtually no effect of the signal you wrote last time. This makes it possible to obtain a reproduced signal without residual noise.

〔Example〕

An embodiment of the floppy disk drive of the present invention will be described with reference to the drawings.

FIG. 1(α) is an external view of a magnetic head used in the floppy disk drive of the present invention. 1°1 and 102 are
This is the read/write gap. There are two read/write gaps in one head. When recording, two heads are used, but when reproducing, naturally, one head is sufficient.

In the present invention, a head located at the rear when viewed from the medium is used as a playback head. This is because this is more advantageous in terms of settings such as erase timing. In this case, the head gap of the other head is set wider. That is better for reducing overrides. Other points remain the same, except that 1o3 is an erase gap, 104 is a ferrite 23, 105 is a slider, and 106 is a coil.

The coils themselves are also wound separately so that the two gaps 23 create separate closed loops of magnetic paths.

, 107 is a gimbal.

FIG. 1(b) is a block diagram of the floppy disk of the present invention. Compared to the conventional example (Fig. 2(b)), several write data delay circuits (1°B)' are added, and signals can be written from the read/write circuit (109) to two heads (113) at the same time. The difference is that it is now possible to

The delay time of this delay circuit is set by the gap interval between the two helad gaps. The delay time varies depending on the track position of the head.

Since the spindle motor rotation speed of the floppy disk drive of the present invention is 300 rpm, when the head is on a track at a radius r from the center of the spindle motor,
If the gap interval is L, the delay time is set to (1/α'7cr, 5) seconds. The delay time is automatically set by a delay circuit based on track position information.Many references 1) Nikkei Electronics May 5, 1986 issue? , 123 [Effects of the Invention] The floppy disk drive of the present invention can significantly reduce signal erasure, thereby reducing the error rate.

[Brief explanation of drawings]

FIG. 1(α) is an external view of a magnetic head used in the floppy disk drive of the present invention. FIG. 1Cb) is a block diagram of the floppy disk drive of the present invention. FIG. 2 (α) is an external view of a magnetic head used in a conventional 70-tip disk drive. FIG. 2Cb) is a block diagram of a conventional floppy disk drive. Applicant: Shichiiko Epunun Co., Ltd. Figure 1 (a), Figure 11 (b)

Claims (1)

[Claims] A read/write head that overwrites the recorded magnetization pattern, an erase head (103) that erases the magnetization pattern around it, a stepper drive circuit/stepper (112) that positions the head, and rotates the magnetic recording medium. In a floppy disk drive whose main component is a spindle drive circuit/spindle motor (111), the read/write head has two head gaps (102), (103), and
The two heads are lined up on the same track, and two gaps record the same signal at the same point on the medium, so a recording signal delay circuit (108) corresponding to the distance between the two gaps is used.
A floppy disk drive characterized by having a circuit section.