JPH02156466A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To diminish abrasion of a head even when a magnetic sheet is rotated at high speed and to assure the head of long life by moving the head before rotating the sheet in order to bring them under a slightly noncontact state in such a reproducing device for a video floppy driving device, etc., to be set up in an electronic still camera. CONSTITUTION:When the head 2 is positioned to start a recording, a step motor 4 is pulse-driven by a drive command (b) to move the head 2 in the direction as shown with an arrow 19 from an already recorded track 16 on the magnetic sheet 1, and after a prescribed time, the head 2 is brought back in the direction of an arrow 20 to be opposite to a recording position of a track 17 by driving the motor this time in the reverse direction by one pulse. Thus, by reciprocating the head 2, the sheet 1 and the head 2 are released from their contact state, and a drive command (c) is given from a control circuit 9 to a spindle motor driving circuit 8, so as to operate a spindle motor 3.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to magnetic recording and reproducing devices such as video 70 bead drives incorporated in electronic still cameras.

2. Description of the Related Art Conventionally, for example, in a magnetic recording and reproducing device consisting of a video flash drive device built into an electronic still camera, the power source is a battery or a storage battery. 1. Title of the invention: Magnetic recording and reproducing device 2. Claims (1) A magnetic recording and reproducing device that records or reproduces signals by bringing a head into contact with a rotating magnetic sheet, comprising: comprising a head driving means for moving the head, a magnetic sheet driving means for rotating the magnetic sheet, and a control means for giving drive commands to each of the two driving means,
3. When starting the rotation of the magnetic sheet from a stopped state where the magnetic sheet is in close contact with the head, the head is moved by the head driving means, and then the magnetic sheet is started to rotate by the magnetic sheet driving means. What is claimed is: 1. A magnetic recording/reproducing device characterized by having a configuration in which:

(2) The magnetic recording/reproducing apparatus according to claim 1, wherein the moving direction of the head is the radial direction of the magnetic sheet.

(3) The movement of the head is required to be instantaneous as a reciprocating movement. Therefore, in response to the first request, a configuration is adopted in which the rotational drive of the magnetic sheet is stopped when the recording of the signal is completed, and when the recording of the next signal is required, the magnetic sheet is rotated again. Reduces power consumption. Furthermore, the second requirement is met by rapidly starting the rotation of the magnetic sheet.

Problems to be Solved by the Invention However, in the conventional configuration described above, the magnetic sheet and the head are left in close contact with each other in the standby state waiting for recording, and from this state the magnetic sheet starts rotating rapidly and starts recording. perform an action, then stop and wait again,
This is repeated.

As shown in FIGS. 8 and 9, a pad 22 and a head 2 are usually provided to sandwich the magnetic sheet 1 in order to stabilize the helad touch when the magnetic sheet 1 is rotating steadily. However, when the magnetic sheet 1 is not rotating, the pad 22 presses the magnetic sheet 101 points against the head 2, resulting in close contact.

When the magnetic sheet 1 is started to rotate rapidly from this state,
The surface of the head is scraped little by little. Particularly in a low-temperature, high-humidity environment, this head is subject to significant wear, resulting in a shortened head life.

The conventional method for reducing this wear is as follows:
Some devices, such as those found in computer floppy disk drives, have a head suspended from a magnetic sheet in a standby state. This method has the problem that the structure for floating the head is complicated and expensive.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a magnetic recording/reproducing device that can cause less wear on the head even when the magnetic sheet is started to rotate rapidly, and can extend the life of the head.

Means for Solving the Problems The present invention comprises a head drive means for moving a head, a magnetic sheet drive means for rotating a magnetic sheet, and a control means for giving drive commands to each of the two drive means. The magnetic recording and reproducing apparatus is configured such that when the magnetic sheet is started to rotate from a stopped state where the sheet is in close contact with the head, the magnetic sheet is started to rotate after moving the head.

According to the above-described structure, the present invention first moves the head from a stopped state where the magnetic sheet is in close contact with the head to separate the magnetic sheet and the head from the close contact state, and then rapidly starts rotating the magnetic sheet. Therefore, the friction between the magnetic sheet and the head can be reduced, and the head wear caused by starting rotation of the magnetic sheet can be reduced. Further, since the acceleration when the head moves is much smaller than the acceleration when the magnetic sheet starts rotating, the amount of wear caused by moving the head is small, and a practically sufficient head life can be obtained.

Embodiment FIG. 1 is a block diagram of an electronic still camera incorporating a magnetic recording/reproducing device according to an embodiment of the present invention.

Now, when the release switch 16 is pressed and a start command is given to the control circuit 9, the control circuit 9 first outputs a drive command to the step motor drive circuit 7, and then, after a predetermined time, starts driving the spindle motor. A drive command C is output to the circuit 8. In addition, substantially parallel to this, a drive command d is also output to the diaphragm and shutter 13.

A step motor 4 driven by a step motor drive circuit 7 is provided with a screw shaft 6 . This screw shaft 6 is fitted into a carriage 6, and the carriage 6 mounts the head 2 and is held movably in the radial direction of the magnetic sheet 1 (not shown). Therefore, by driving the step motor 4, the head 2 can be moved in the radial direction of the magnetic sheet 1. Figure 2 shows the movement of head 2 at this time.
This will be explained with reference to FIG. 16 is a track that has already been recorded on the magnetic sheet 1, and 17 and 18 are tracks that have not yet been recorded. As shown in Figure 2,
Assume that in the initial state, the head 2 is at the position of the track 17 on which recording is to be performed.

When the step motor 4 is driven by one pulse in accordance with the drive command, the head 2 moves in the direction of the arrow 19 to the position shown in FIG. After a predetermined period of time, the head 2 is returned to the direction of the arrow 20 by one pulse drive in the opposite direction. Then, the head 2 returns to the position of the track 17 on which recording is to be performed, as shown in FIG. By this reciprocating movement of the head 2, the magnetic sheet 1 and the head 2 can be separated from the close contact state, and a minute air layer can be formed. Here, the time for the one-pulse drive and the predetermined time depend on the driving ability of the step motor 4, but several milliseconds are sufficient for each, and the time required for reciprocating movement is at most several milliseconds. A drive command C from the control circuit 9 to the spindle motor drive circuit 8 is given after this reciprocating operation is completed. That is, after a minute air layer is formed, the spindle motor 3
Start booting. Note that since the air layer is formed immediately after the head 2 moves, the spindle motor 3 may be started during the reciprocating movement of the step motor 4.

By doing so, even if the spindle motor 3 is started to rotate rapidly, the friction between the magnetic sheet 1 and the head 2 can be reduced, and the wear of the head 2 can be reduced. The time required to start up the spindle motor 3, that is, the magnetic sheet 1 to a predetermined rotational speed, is about 100 milliseconds including the servo pull-in time of the spindle motor drive circuit 8, so even if the time required for the above-mentioned reciprocating movement is Even if this is added, the recording start time will not become extremely long and will not be a problem at all.

On the other hand, almost parallel to the drive command C to the spindle motor drive circuit 8, a drive command d is output from the control circuit 9 to the aperture and shutter 13, and the lens 14 is output from the subject.
The light that has passed through is controlled by an aperture and a shutter 13 to expose the image sensor 12. Then, a signal obtained from the image sensor 12 by exposure is processed by the signal processing circuit 11, and then amplified by the recording amplifier 1o, and the head 2 is energized to record the signal. Needless to say, the image sensor 12
The signals obtained are recorded after the magnetic sheet 1 reaches a predetermined rotational speed. In addition, the aperture and shutter 1
Since the drive command d to the step motor drive circuit 7 is for starting exposure of the image sensor 12, the drive command el to the step motor drive circuit 7 is output in parallel with the drive command el, and even if the command is given early, I do not care.

When recording is completed, the control circuit 9 outputs a drive command to the step motor drive circuit 7 again, and the step motor 4 is driven to move the head 2 to the position of the track 18 to be recorded next.

After this movement is completed, the control circuit 9 sends a stop drive command C to the spindle motor drive circuit 8 to stop the rotation of the magnetic sheet 1. Then, the camera waits until the release switch 16 is pressed again.

Note that the movement of the head 2 performed immediately before the start of rotation of the magnetic sheet 1 (several milliseconds before 1Q) was defined as a reciprocating operation, but the position of the head 2 in the standby state before the release switch 15 is pressed is As shown in the figure, the head 2 is placed at a position slightly shifted from the predetermined track 17 to be recorded, and immediately before the magnetic sheet 1 starts rotating, the head 2 is moved in the direction of the arrow 21 in FIG. Move it to a predetermined trough 21 position as shown in Figure 6. Immediately after that, the magnetic sheet 1 is started to rotate, and after performing the above-mentioned recording operation, the head 2 is moved to a position slightly shifted from the track 18 to be recorded next, as shown in FIG. sheet 1
It may be configured to stop rotating and wait.

Furthermore, although the direction of movement of the head 2 immediately before starting rotation of the magnetic sheet 1 is the radial direction of the magnetic sheet 1, which is the same as the direction of track movement, it may be a different direction. That is, instead of fixing the carriage 6 and the head 2, for example, the head 2 may be attached to a piezo element and mounted on the carriage 6, and the head 2 may be moved in the tangential direction of the magnetic sheet 1. .

As described in detail, according to the present invention, the head is moved before the magnetic sheet is rotated to separate the magnetic sheet and the head from the close contact state. There is little wear on the head even when the rotation is started,
It is possible to extend the life of the head, and the configuration can be realized simply by setting the timing of the drive command output from the control circuit, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electronic still camera incorporating a magnetic recording/reproducing device showing one embodiment of the present invention, and FIGS.
The figure is an explanatory diagram showing an example of head movement in the same embodiment,
6 to 7 are explanatory diagrams showing other examples of head movement in the same embodiment, and FIGS. 8 and 9 are explanatory diagrams showing head touch states in a magnetic recording and reproducing device incorporated in an electronic still camera. It is. 1...Magnetic sheet, 2...Head, 3
...Spindle motor, 4...Step motor, 7...Step motor drive circuit, 8
...Spindle motor drive circuit, 9...
・Control circuit. Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (4)

[Claims] (1) A magnetic recording and reproducing device that records or reproduces signals by bringing a head into contact with a rotating magnetic sheet, comprising a head driving means for moving the head, a magnetic sheet driving means for rotating the magnetic sheet, and control means for respectively giving drive commands to the two drive means,
When starting the rotation of the magnetic sheet from a stopped state where the magnetic sheet is in close contact with the head, the head driving means moves the head and then the magnetic sheet driving means starts the rotation of the magnetic sheet. A magnetic recording/reproducing device characterized by: (2) The magnetic recording and reproducing apparatus according to claim 1, wherein the moving direction of the head is the radial direction of the magnetic sheet. (3) A magnetic recording and reproducing apparatus according to claim 1 or 2, characterized in that the moving operation of the head is a reciprocating movement. (4) The position of the head with the magnetic sheet stopped rotating is set to a position slightly shifted from the track position to be recorded or reproduced next, and immediately before starting rotation of the magnetic sheet, the head 3. The magnetic recording and reproducing apparatus according to claim 1, wherein the magnetic recording and reproducing apparatus moves the magnetic recording device to the track position.