JPS61280014A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a magnetic head from being broken by selecting a magnetic cleaning operation mode and loading a cleaning sheet, and rotating the cleaning sheet at a specific rotating speed for a specific time and then stopping the rotation of the cleaning sheet automatically. CONSTITUTION:The head cleaning mode is selected with a mode change-over SW 19 and the cleaning sheet 10 is loaded instead of a magnetic disk. Then, a motor control circuit 16 drives a motor 14 through a motor driving circuit 15 to rotate the cleaning sheet 10, which slides on the sheet abutting surface of a head 11 to start cleaning operation. Simultaneously, a timer 17 begins to measure the time and the head 11 is moved by a head driving circuit 12 from the 1st track to the final track. When the time required to clean the magnetic head 1 is elapsed, the timer 17 outputs a motor stop signal to the motor control circuit 16 to stop supplying electric power to the motor 14 through a motor driving circuit 15, thereby stopping the rotation of the cleaning sheet 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording/reproducing apparatus for recording and reproducing signals on a disc-shaped magnetic recording medium.

Conventional technology In a magnetic recording and reproducing device that records and reproduces data on a magnetic recording medium such as a magnetic sheet, when recording and reproducing operations are performed many times, magnetic particles and air that come off from the magnetic sheet are deposited on the sheet contact surface of the magnetic head. Dust and other substances may adhere to the inside, increasing space loss, making it impossible to obtain good contact between the magnetic sheet and the magnetic head, making it impossible to perform optimal recording, and reducing the S/N of the reproduced signal. or deteriorate. In addition, the attached magnetic powder and dust can cause burning of the sheet contact surface of the magnetic head and peeling of the magnetic sheet. Therefore, is it necessary to clean the head from time to time? Hereinafter, an example of head cleaning in a conventional magnetic recording/reproducing apparatus will be explained with reference to the drawings. FIG. 4 is an explanatory diagram of a conventional cleaning member. Conventionally, for head cleaning,
A cleaning member having foamed neoprene rubber 2 attached to the tip of a piece of paper 1 was used to clean the magnetic head 3 by wiping the sheet contact surface 4 of the magnetic head 3 with the foamed neoprene rubber 2.

Also, instead of using a leaning member like this, a third
As shown in the figure, the jacket 6 has the same shape as the one that stores the magnetic sheet for recording and reproducing, and a cleaning cassette containing the cleaning sheet 6 instead of the magnetic sheet is attached to the magnetic recording and reproducing device. It is conceivable that the cleaning sheet 6 is brought into contact with the magnetic head and rotated to clean the sheet contacting surface of the head.

7 is a center core, and 8 and 9 are reference holes for attaching the jacket 5 to the device.

Problems to be Solved by the Invention However, when cleaning a magnetic head using the above method, there are problems as described below. When the cleaning member shown in FIG. 4 is used, there is a risk that the foamed neoprene rubber 2 may be strongly slid against the sheet contact surface 4 of the magnetic head 3, thereby damaging the magnetic head 3. Furthermore, if the magnetic head is located deep inside the device, it may be difficult to directly clean the head with a cleaning member like this. In addition, when cleaning the magnetic head using the cleaning cassette shown in FIG. 3, if the cleaning sheet 6 is rotated by being attached to the device for a longer time than necessary,
The sheet abutting surface of the magnetic head has been scraped and its shape has changed, making it impossible to obtain good contact between the magnetic sheet and the magnetic head the next time the magnetic sheet is attached. There is a problem in that the cleaning sheet 6 slides on the sheet abutting surface of the magnetic head for a long period of time, and the cleaning sheet 6 damages the sheet abutting surface of the magnetic head.

In view of the above-mentioned problems, the present invention automatically controls the rotation of the cleaning sheet after the cleaning sheet is attached and rotated for a predetermined time or a predetermined number of rotations when the magnetic head cleaning operation mode is selected. By stopping the cleaning sheet, the cleaning sheet will not be left on and rotated for an unnecessarily long time.
It is an object of the present invention to provide a magnetic recording and reproducing device that does not damage the sheet contacting surface of a magnetic head or change the shape of the sheet contacting surface with a cleaning sheet.

Means for Solving the Problems In order to solve the above problems, the magnetic recording and reproducing device of the present invention includes a recording/reproducing means for recording or reproducing information on a disk-shaped magnetic recording medium, and a disk-shaped cleaning sheet. head cleaning means for cleaning the magnetic head;
The head cleaning means includes means for selecting the recording/reproducing means and the head cleaning means, and the head cleaning means includes: 1. The apparatus is provided with means for automatically stopping the rotation of the cleaning sheet after the cleaning sheet has been rotated for a predetermined period of time or a predetermined number of rotations.

According to the above-described configuration, when the cleaning sheet is attached to the device and the head is cleaned, the cleaning sheet rotates for a predetermined time or a predetermined number of rotations and then automatically stops, thereby preventing the cleaning sheet from being used more than necessary. This prevents the magnetic head from sliding on the sheet contact surface of the magnetic head, thereby preventing damage to the magnetic head.

Embodiments Hereinafter, magnetic recording and reproducing apparatuses according to embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a magnetic recording/reproducing apparatus according to a first embodiment of the present invention. In FIG. 1, 10 is a magnetic sheet or cleaning sheet, 11 is a magnetic head, 12 is a head drive circuit,
13 is a recording/reproducing circuit, 14 is a motor, 16 is a motor drive circuit, 16 is a motor control circuit, 17 is a timer, 18
19 is a system control circuit, and 19 is a mode switching SW for selecting between recording/playback mode and head cleaning mode.
It is. The operation of the magnetic recording/reproducing apparatus constructed as described above will be explained below with reference to FIG. First, a case where the recording/reproducing mode is selected by the mode switching 5W19 will be described. When the recording/reproducing mode is selected by mode switching 5W19 and the magnetic sheet 1o is attached, the motor control circuit 16 drives the motor 14 via the motor drive circuit 16 to rotate the magnetic sheet 10. At this time, the operation of the timer 17 is stopped by the system control circuit 18. The head 11 is a head drive circuit 1.
2, move to the selected track position and start recording/recording.
Recording or reproduction is performed by the reproduction circuit 13.

Next, the operation when the head cleaning mode is selected by the mode switching SW 19 will be explained.

The head cleaning mode is selected by the mode switching SW19, and a cleaning sheet 1 is used instead of the magnetic sheet.
0 is attached, the motor control circuit 16 drives the motor 14 via the motor drive circuit 16 to rotate the cleaning sheet 10 and slide the sheet contact surface of the head 11 to start cleaning the head 11. At the same time, the timer 17 starts measuring time. During the cleaning operation, the head 11 is moved by the head drive circuit 12 from the first track to the final track. When the time required to clean the magnetic head 11 has elapsed,
The timer 17 outputs a motor stop signal to the motor control circuit 16, and the motor control circuit 16 stops supplying power to the motor 14 via the motor drive circuit 16, thereby stopping the rotation of the cleaning seat 10.

As described above, according to this embodiment, when the head cleaning mode is selected and the cleaning sheet is attached, the cleaning sheet rotates for a predetermined time required to clean the magnetic head, cleans the magnetic head, and then automatically Since the rotation of the cleaning sheet is stopped, the shape of the sheet abutting surface of the magnetic head changes when cleaning the magnetic head by rotating the cleaning sheet for a longer time than necessary as in the conventional system. This can prevent the magnetic head from being damaged. Additionally, by moving the magnetic head back and forth during the cleaning operation, the head does not always come into contact with the same spot on the cleaning sheet, so by cleaning the magnetic head, the dust attached to the cleaning sheet can be returned to the head. The magnetic head will not be damaged by dust or dust that has adhered to the cleaning sheet.

Furthermore, the life of the cleaning sheet can be extended.

A second embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing the configuration of a magnetic recording/reproducing apparatus according to a second embodiment of the present invention. In the same figure, the difference from the configuration in FIG. 1 is that instead of the timer 17,
Motor rotation count circuit 2 that counts the number of sheet rotations
This is the point where o is provided. Hereinafter, in FIG. 2, the same components as those in FIG. 1 are given the same numbers and their explanations will be omitted. The magnetic head cleaning mode is selected by mode switching 5W19, and the cleaning sheet 10 is installed.7.The motor 14 is driven and the cleaning sheet 1
0 rotates, the motor rotation number counting circuit 2o starts operating. This motor rotation speed counting circuit 20 detects that the motor 14 has rotated a predetermined number of times necessary for the cleaning sheet 10 to remove dust and magnetic powder attached to the sheet contact surface of the magnetic head 11. Then, a motor stop signal is sent to the motor control circuit 16 to stop driving the motor 14. Here, the count of the number of rotations of this sheet is
By counting pulses obtained from a well-known FG (not shown) for detecting the rotational speed of the motor 14, or by counting pulses obtained from a PG (not shown) for detecting the rotational phase of the motor 14. easily achieved.

As described above, in this embodiment, it is detected that the cleaning sheet has rotated a predetermined number of rotations necessary to clean the magnetic head, and the rotation is automatically stopped. Since the contact surface does not slide more than necessary, it is possible to prevent damage to the magnetic head even if the shape of the sheet contact surface of the magnetic head is changed, as in the first embodiment.

Effects of the Invention As described above, according to the present invention, when cleaning the magnetic head, the cleaning sheet is not slid over the sheet contact surface of the entire magnetic head more than necessary, so cleaning/cleaning is not required as in the conventional case.
An excellent effect can be obtained in that the magnetic head will not be damaged by deforming the sheet abutting surface of the magnetic head or damaging the sheet abutting surface by using the magnetic head for a long time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a magnetic recording/reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a magnetic recording/reproducing apparatus according to a second embodiment of the present invention, and FIG. This figure is a plan view of the cleaning jacket, and FIG. 4 is an explanatory diagram of a conventional magnetic head cleaning member. 11...Magnetic head, 12...Head drive circuit, 14...Motor, 1ε/fist...
Motor drive circuit, 16...Motor control circuit, 1
7...Timer, 19...Mode switching SW, 20...Motor rotation speed counting circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure fO Figure 2

Claims (2)

[Claims] (1) A recording/reproducing means for recording or reproducing information on or from a disk-shaped magnetic recording medium, a head cleaning means for attaching a disk-shaped cleaning sheet to clean the magnetic head, and the recording/reproducing means and the head cleaning means. A magnetic recording and reproducing apparatus, characterized in that the head cleaning means includes means for stopping rotation of the cleaning sheet after rotating the cleaning sheet for a predetermined time or a predetermined number of rotations. . (2) The magnetic recording and reproducing apparatus according to claim 1, wherein the head cleaning means includes means for rotating a cleaning sheet and moving the magnetic head during head cleaning.