JPH03283145A - Disk driver - Google Patents

Abstract

PURPOSE:To make the pitch between an optional track and its adjacent track constant by fitting a head to a head carriage member through a movable member which can freely occupy two positions at a distance corresponding to the pitch between tracks of a recording medium. CONSTITUTION:For frame recording, the head 10 is moved first to one of two tracks to be recorded as usual and one field of a frame image is recorded. Then an electromagnet 16 is fed with electricity and then the head 10 moves to the outer peripheral side of the floppy disk 23 against an energizing force 14 by a distance corresponding to the one-track pitch. At this position, fields of the frame image are recorded and then the electromagnet 16 is powered off. Then the head 10 and its head support member 12 are returned to their positions by the energizing spring 14. Consequently, the pitch between an optional track and its adjacent track becomes invariably constant.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk drive device, and more specifically to a disk drive device for a still video camera that performs frame recording using a field head.

[Prior art] When recording frames using a field head,
In the conventional example, the field and
Recording was performed by sending the head to an adjacent track.

Furthermore, as for the configuration of head movement, there is an example in which an independent head movement mechanism is provided in addition to the normal head movement mechanism for fine adjustment of tracking and high-speed head movement. However, this is not intended to improve the pitch accuracy of adjacent tracks.

[Problem to be solved by the invention] In still video floppies, which are recording media for still video cameras, the standard limit for each track radius is 1.
Since it is 4 .mu.m, when frame recording is performed using a field head, the pitch error between adjacent tracks must be considered to be 20 .mu.m at worst. If an attempt is made to reproduce this frame using a frame head, there is a pitch difference of 20 μm or more between adjacent tracks, so it is not possible to obtain a sufficient reproduction output with the same head position for the two tracks of frame recording. As a result, the quality of the reproduced image deteriorates.

To prevent this, it is sufficient to increase the accuracy of the pitch between adjacent tracks during recording, but in order to increase the accuracy of any pitch between adjacent tracks, it is necessary to increase the accuracy of all pitches between adjacent tracks.

That is, in addition to the absolute track accuracy, the accuracy of 49 inter-track pitches must also be managed and guaranteed.

In addition, if a feeding mechanism is provided exclusively for one track and all track feeding is performed by this dedicated feeding mechanism, errors will accumulate each time the head moves, so submicron accuracy is required to meet the absolute tracking accuracy standard. The pitch must be guaranteed.

In this way, achieving both absolute track accuracy and pitch accuracy between adjacent tracks requires strict accuracy control.
This causes difficulties in manufacturing and use.

Therefore, it is an object of the present invention to provide a disk drive device that eliminates such problems.

[Means for Solving the Problems] A disk drive device according to the present invention includes one of the recording media.
It is characterized in that the head is attached to the head carriage via a movable member that can occupy two positions separated by a distance corresponding to the pitch between tracks.

[Function] When it is desired to move the head from any track to an adjacent track, the movable member allows the head to move over a constant distance at all times. Therefore, the pitch between any track and the adjacent track can always be kept constant.

[Example code] Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention.

10 is a field head, 12 is a head support member that supports the field head 10, 14 is a biasing spring, 16
18 is an electromagnet, 18 is a drive motor, 20 is a lead screw rotated by the drive motor 18, 22 is a rotating shaft of a spindle motor that rotates the still video floppy disk 23, and 24 is a field that is rotated by the rotation of the lead screw 20. - A carriage that integrally transports the head 10, head support member 12, biasing spring 14, and electromagnet 16 in the radial direction of the still video floppy 23; 26 is a guide that is parallel to the lead screw 20 and guides the carriage 24;・It's a bar.

When the field head 10 and the head support member 12 are placed on the carriage 24 and the electromagnet 16 is not energized, the head 10 and the head support member 12 are drawn toward the inner circumference of the floppy disk 23 by the biasing spring 14. However, when the electromagnet 16 is energized, the head 10 and the head support member 12 resist the biasing spring 14 and move the floppy disk 2.
3, so that it can move toward the outer circumferential side by a predetermined distance, that is, a distance corresponding to one track pitch (for example, 100 μm).

For normal track feeding, the drive motor 18 rotates the lead screw 20, which moves the carriage 24, or field head 10, in the radial direction of the floppy 23.

On the other hand, when performing frame recording, first, the head 10 is sent to one of the two recording tracks as usual, and one field of the frame image is recorded. Thereafter, the electromagnet 16 is energized. By energizing the electromagnet 16, the head 10 moves toward the outer periphery of the floppy disk 23 against the urging spring 14 by a distance corresponding to one track pitch.

At this position, record the remaining fields of the frame image. After recording, the electricity to the electromagnet 16 is stopped.

Then, the head 10 and the head support member 12 are returned to their original positions by the biasing spring 14.

In this embodiment, the track pitch for frame recording is set by the head 10 and the head support member 1 on the carriage 24.
This corresponds to the moving distance of 2, and is always constant.

FIG. 2 shows a schematic structural diagram of another embodiment of the invention. 1st
Components that are the same as those in the figure are given the same reference numerals. 30 is a field head, and 32 is a head support member that supports the field head 30. 34 is a carriage that conveys the head 30 and the head support member 32 in the radial direction of the floppy disk; 36 is a biasing spring that urges the head 30 and the head support member 32 toward the inner peripheral side of the floppy disk 23 on the carriage 34; 38; A cam is a cam that rotates to move the head 30 and the head support member 32 toward the outer circumference of the floppy disk 23 by a distance equivalent to one track pitch against the biasing spring 36.

That is, in the embodiment shown in FIG.
After recording two fields, the cam 38 is rotated to move the head and head support member 32 against the biasing spring 36.
Move the track pitch to the outer periphery and record the remaining field at that position. After recording is completed, the cam 38 is further rotated, and the biasing spring 36 returns the head 30 and head support member 32 to their original positions.

In the embodiment of FIG. 2 as well, the pitch between adjacent tracks is always kept constant.

[Effects of the Invention] As can be easily understood from the above description, according to the present invention, the pitch between any track and the adjacent track can be kept constant at all times with a simple configuration. Therefore, with a simple configuration, both absolute track accuracy and pitch accuracy between any two adjacent tracks can be achieved. Furthermore, without using a frame head, it is possible to record on a recording medium a signal that provides a stable and sufficiently strong reproduction output when reproduced by the frame head.

[Brief explanation of drawings]

FIG. 1 is a schematic structural diagram of one embodiment of the present invention, and FIG. 2 is a schematic structural diagram of another embodiment.

Claims (1)

[Claims] 2 tracks separated by a distance equivalent to the pitch between one track on the recording medium
A disk drive device characterized in that a head is attached to a head carriage via a movable member that can occupy two positions.