JPS5914941Y2 - Head position setting device for magnetic recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a head position setting device for a magnetic recording device that detects and sets the position of a magnetic head with respect to a plurality of tracks set on a rotating magnetic recording medium such as a magnetic disk.

Generally, in a magnetic recording device using a magnetic disk, for example, a magnetic head is moved along a radius line of the magnetic disk.
I am trying to select the track set on the magnetic disk.

For example, information is recorded on the designated track, and in the information recording operation stage, it is necessary to set the position of the magnetic head for selecting the track.

For this purpose, it is necessary to detect the position of the magnetic head with respect to the magnetic disk, and conventionally this has been done, for example, as follows.

That is, FIG. 1 shows a position detection section of a magnetic recording apparatus, and a magnetic disk 1 is driven to rotate at high speed in the direction of the arrow by a drive motor (not shown).

A magnetic head 2 is set for recording and reproducing information on this disk 1. This magnetic head 2 is supported by an arm 3, and is moved linearly toward the center of the rotation axis of the disk 1 by a linear motor 4. The movement of the track is controlled and can be set correspondingly to a large number of tracks set on the disc 1.

Then, a slit plate 5 is integrally attached to the arm 3, and the light from the light source 6 is detected by the photodetector 7 through the slit plate 5.
detects the position of the magnetic head 2 with respect to the disk 1, controls the linear motor 4, and moves the magnetic head 2 to a predetermined track.
I'm trying to control the settings.

However, in such conventional magnetic recording devices, the position of the head 2 with respect to the disk 1 is detected by detecting the position of the arm portion 3 of the magnetic head 2, which is configured separately from the magnetic disk 1. Therefore, not only is it difficult to set an absolute mutual positional relationship, but also the arm portion 3, magnetic disk 1, etc. expand and contract due to changes in temperature, humidity, etc., making accurate position detection impossible.

This idea was made in view of the above circumstances, and its purpose is to accurately detect the position of the magnetic head with respect to the magnetic recording medium, and not only to smoothly control the recording and reproduction of information, but also to It is an object of the present invention to provide a head position setting device for a magnetic recording device that is advantageous in terms of compatibility of recording media.

An embodiment of this invention will be described below with reference to the drawings.

In FIGS. 2 and 3, reference numeral 11 indicates a magnetic recording device used, for example, as a terminal of an electronic computer.
Rotationally driven.

On the outer periphery of the magnetic disk 11, a plurality of sector marks 13 made of, for example, through holes are recorded in advance at equal intervals.

This sector mark 13 is optically detected by a detector 14 such as a photosensor, converted into an electrical signal, and supplied to a position detection circuit 15 as a sampling signal.

Magnetic head 1 set for the magnetic disk 11
6 is supported by an arm 17 as in the case of FIG. 1, and is moved linearly by a drive mechanism 18 such as a linear motor to select a track on the magnetic disk 11.

In this case, on each track of the magnetic disk 11, track information such as a track number is recorded as, for example, a 4-bit signal in correspondence with each selector mark 13, and the magnetic head 16 reads this track information. The signal is supplied to the position detection circuit 15.

That is, the position detection circuit 15 detects track information in response to the sampling signal from the detector 14, and when it detects track information that matches the set track number, it gives a command to the drive circuit 19 and sends a command to the drive mechanism 18. , and perform predetermined track position detection settings.

FIG. 4 shows the position detection circuit 15 in detail.
Sampling signal from detector 14 and magnetic head 1
The information signals from 6 are supplied to an AND circuit 22 via amplifiers 20 and 21, respectively.

The AND circuit 22 extracts the information signal from the magnetic head 16 in response to the sampling signal from the detector 14 and supplies it to the counter 23 as preset information.

This counter 23 takes out a 4-bit count value signal corresponding to the information signal supplied from the AND circuit 22, and sends this signal to exclusive OR circuits (hereinafter simply referred to as EOR circuits) 24a to 24d, respectively. supply

On the other hand, a setting command section (not shown) sends a 4-bit signal of the track number to be specified to lines 25a to 25.
d, and the EOR circuits 24a to 24d.

That is, the EOR circuits 24a to 24d each generate an output signal of logic "1" when the signal from the counter 23 and the signal from the lines 25a to 25d match. This EOR circuit 24 a
The output signal from ~24d is supplied to a NAND circuit 26.

That is, the NAND circuit 26 outputs a drive signal "1" when the counted value from the counter 23 and the designated track number set do not match, and controls the drive mechanism 18 to move the magnetic head 16. When the count value and the track number match, the output becomes "0" and the drive mechanism 18 is controlled to stop.

That is, in the above-described apparatus, if the track to be recorded by the magnetic head 16, that is, the track number for which a setting command is given, is the second track.
This track number is a 4-bit binary signal such as rool.
oj is supplied to the EOR circuits 24a to 24d.

When the magnetic disk 11 is driven, the magnetic head 16 sequentially moves from the first track on the outer periphery and reads track information recorded on each track.

Then, corresponding to the sampling signal from the detector 14, the track information from the AND circuit 22 is taken out and preset stored in the counter 23, and the count value information is
OR circuits 24 a to 24 d G: Supplied.

In the EOR circuits 24 a to 24 d, this counter 23
The count value output and the set track number information r0010"
For example, when the magnetic head 16 is in the first track, the contents of the counter 23 are roo.
Become oIJ.

At this time, the outputs of the EOR circuits 24a to 24d are rllo
oJ, the output from the NAND circuit 26 becomes "1", and the magnetic head 16 is further moved.

When the magnetic head 16 is in the second track, the output of the counter 23 is roloJ, and therefore the output of the EOR circuits 24a to 24d is "1111".
Therefore, the output of the Attenand circuit 26 becomes "0".

Therefore, the drive mechanism 18 is stopped and the magnetic head 16
detects a predetermined second track and is set at that position.

In the above embodiment, the case where the track number information recorded on the magnetic disk is a 4-bit binary signal has been explained, but the present invention is not limited to this, and the same implementation can be performed with, for example, a pulse signal of a number corresponding to the track number. can.

In addition, it was explained that sector marks using through-holes and light are used as signals for sampling the track information read by the magnetic head, but this sector mark is not limited to this. It may be something.

Furthermore, although the case where the magnetic recording medium is a disk-type magnetic disk has been described, the present invention can be similarly implemented for a magnetic drum that is a similar rotating magnetic recording medium.

In addition, this invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without changing the gist of the invention.

As detailed above, according to this invention, the position of the magnetic head can be detected using information recorded on the magnetic recording medium itself, so the position of the magnetic head can be reliably detected.
Unaffected by external conditions such as temperature and humidity,
Therefore, it is possible to provide an extremely convenient head position setting device for a magnetic recording device, which facilitates information recording and reproduction control, improves compatibility of magnetic recording media, and reduces costs without requiring any special external configuration. It is something.

[Brief explanation of drawings]

FIG. 1 is a block diagram schematically showing the position detection section of a conventional magnetic recording device, FIG. 2 is a block diagram of a magnetic recording device according to an embodiment of the present invention seen from the side, and FIG. 3 is the same configuration. The explanatory diagram, FIG. 4, is a diagram showing the configuration of the position detection circuit of the above embodiment. 11...Rotating magnetic recording medium, 13...
Sector mark, 14...Detector, 15...
...Position detection circuit, 16...Magnetic head, 25
a-25 d...Specified track number.

Claims (1)

[Scope of utility model registration request] A rotating magnetic recording medium that records track number information corresponding to each set track, a magnetic head whose movement is controlled in a direction to sequentially switch each track of this magnetic recording medium, and a specific rotational angular position of the magnetic recording medium. means for obtaining a sampling signal corresponding to the sampling signal; means for detecting a read track number from the magnetic head in response to the sampling signal obtained by the means; and a means for detecting a read track number from the magnetic head in accordance with the sampling signal obtained by the means; 1. A head position setting device for a magnetic recording device, comprising means for comparing the read track number and the designated track number, and moving the magnetic head until the read track number matches the designated track number.