JPS60170017A - Cleaning disk pack and magnetic disk device using said disk pack - Google Patents

Abstract

PURPOSE:To avoid the injuries of a magnetic head due to a cleaning action by cleaning the head just for a proper period of time after detecting that a cleaning pack is loaded. CONSTITUTION:A cleaning disk can be loaded on the same magnetic disk device as a magnetic disk pack and also has such a similar shape as the magnetic disk pack that can revolve said disk. However the cleaning disk has no PG pin which serves as a phase generating part which produces a magnetic detection signal showing the rotary phase of the disk. When a cleaning pack is loaded, a switch 51 is turned on to deliver an indication for disk revolution. However a detection circuit output PGS, i.e., a PG pin detection signal is kept at a low level since the PG pin is never detected. Thus a cleaning detection signal 59S is also kept at a low level. A cleaning time setting circuit output 53S is set at a low level when the cleaning time of a magnetic head 61 is over with the cleaning disk. Then an OR circuit output 57S is set at a low level. As a result, an AND circuit 55 is closed to stop the output for indication of disk revolution. Then the revolution of the cleaning disk is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a cleaning disk pack and a magnetic disk device using the same, and particularly to cleaning a magnetic head when excessive cleaning is performed and the magnetic head is damaged. The present invention relates to a cleaning disk pack that prevents storage and a magnetic disk device using the same.

Prior Art and Problems Recently, imaging devices such as solid-state imaging devices and image pickup tubes have been combined with recording devices that use inexpensive and relatively large-capacity magnetic disks as recording media, and it is now possible to capture objects purely electronically. An electronic still camera system has been devised in which images are taken and recorded on a rotating disk, and the images are reproduced using a separate television system or printer.

In magnetic disk devices incorporated in such electronic still cameras and playback devices, if the magnetic head that records information on or plays back information from the &1-chip disk becomes clogged with dust, the information will be lost. There is a risk that recording and playback may not be performed properly. Therefore, a disk pack (hereinafter referred to as a cleaning bag) containing a cleaning disk whose surface was coated with a polishing material instead of a magnetic material was installed, and the magnetic spatula I was placed in sliding contact with the disk pack (hereinafter referred to as a cleaning bag). Is it necessary to rotate the cleaning disk to remove the deposits on the magnetic head?

However, if such cleaning is carried out for more than the required time, not only the magnetic head will be cleaned, but the magnetic head itself will be worn out by the cleaning disk. As a result, the life of the magnetic head is shortened.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned points, and its object is to detect the g-b of the cleaning pack and clean the magnetic head. F ■ The old IJI took a long time, and the throat became magnetic due to cleaning? It is an object of the present invention to provide a cleaning bag that does not receive cleaning back and a magnetic disk device using the same.

Structure of the Invention The dual purpose is to avoid providing a cleaning disk with a PG (Phase Generator) pin, which is a rotating (Q-phase signal generator) provided on a magnetic disk to detect the rotational phase of the magnetic disk. This is achieved by the magnetic disk device 17 such that when no rotational phase signal is detected, the disk is rotated only for a predetermined period.

Embodiment of the Invention FIG. 1 shows a cleaning bar 21 in an embodiment of the invention. Here, 1 is a cleaning bag body (pathogyshi) that has the same shape as the I-disk, and is made up of two plates on the front and back in a thin hollow shape, and inside it is a magnetic disk and a cleaning disk 3 made of Japanese cedar. It is accommodated. Numerals 5 and 7 are holes for positioning the disk pack, and are used for positioning a cleaning bag installed in the magnetic disk unit water body (not shown).

Further, 8 is a screen shutter, a breather shutter, 11 is a counter, and 13 is a center hole. What faces from this center ball 13 is the center core 15 of the cleaning disk 3. A centering portion 17 is formed in this core 15 . When the cleaning pack is attached to the main body of the magnetic disk device, the cleaning disk 3 is rotated around this core. Here, a PG pin is provided on a normal magnetic disk on which information is recorded or reproduced by a magnetic head. This P
The C bin has a center core 15 as shown by sm in the figure.
A phase generator (Phase) is installed near the outer periphery of the disc and generates a magnetic detection signal indicating the rotational phase of the disc.
Generator) and tenopine. In the following description, a disk pack containing a magnetic disk having this PG bin will be referred to as a normal pack.

In the cleaning disk, the protective shutter 9, counter 11, etc. are not necessarily required.

Therefore, herein. "Same shape" means that they have the same shape to the extent that a magnetic disk puncture and a cleaning pack can be loaded into the same magnetic disk device and the disks can be rotated in the same manner.

FIG. 2(A) shows a cross section of a portion of the cleaning pack including the center core. As shown in the figure, the cleaning disk 3 has a center core 15 at its rotation center. An annular magnetic plate 21 is fixed to one end surface of the center core 15 in the axial direction.

First, FIG. 2(B) shows a cross section of a portion including the center core in a normal pack. As shown in the figure, an annular magnetic plate 21 is fixed to one end surface of the center core 15 of the magnetic disk 3A, and a PG pin 23 is also implanted. This PG pin 23 is made of a magnetic material, and is implanted in the center core 15 so that its axial direction coincides with the axial direction of the center core 15.

FIG. 3 shows the PG bin detection mechanism in this embodiment.

Here, 31 is a motor for rotating the disk, and its drive shaft 33 is formed with a fitting portion 35 that engages with the centering portion 17 of the disk. Further, a magnet 37 is disposed in the fitting portion 35.

When the disk pack is attached to the magnetic disk device main body, the annular magnetic plate 21 is attracted by the magnet I.37, and the fitting portion 35 of the drive shaft is attached to the centering portion 17 of the disk.
is securely inserted, and the installation of the disk pack is completed. 39 is a PG pin detection section, which is composed of a PG pickup yoke 40 and a PG pickup coil 41. This detecting section 38 is arranged near the opposite side of the mounted disk pack to the motor 31, and is set so that the PG pickup yoke 40 is located on the rotation locus of the PC pin 23.

In the PG pin detection mechanism having such a configuration, when the magnetic disk 3A approaches the PC pin detection section, an electromotive force is generated in the pickup coil 43 due to the action of the magnetic field. This electromotive force is extracted as a PC bin detection pulse. In addition, P
When the C pin 23 moves away from the PC pin detection section, no magnetic field is generated, and therefore no detection or lasing occurs. That is, this detection pulse is generated periodically every rotation of the magnetic disk 3A. However, this detection pulse is not generated by the rotation of the cleaning disk 3 that does not have the PC pin 23.

FIG. 4 is a block diagram showing the overall configuration of this embodiment.

Here, 43 is a servo circuit that controls the drive of the motor 31. 45 is a frequency generator in the motor 31. 47 is a disk rotation phase detection circuit including the PG bin detection section 38 described above, and outputs a PCC pin output signal PGS. Reference numeral 48 denotes a reference signal generation circuit, which outputs a clock signal vP that serves as a reference for drive control. 51 is a switch for driving the motor, and its output signal 51S is supplied to a cleaning time setting circuit 53 and an AND circuit 55. The output 53S of the cleaning time setting circuit 53 is supplied to one input terminal of the OR circuit 57. On the other hand, 58 is a cleaning pack detection section. This detection section takes in the PG bin detection signal PGS output from the disk rotation phase detection circuit 47, and determines whether or not the attached disk pack is a cleaning pack based on the presence or absence of this signal. As a result of the determination, a detection signal 59S is output which becomes a low level when it is a cleaning pack and a high level when it is a normal pack.

This detection signal 5119 is supplied to the other input terminal of OR circuit 57. The output signal 57S of the OR circuit 57 is supplied to one input terminal of the AND circuit 55. AND circuit 5
The other input terminal of 5 receives a signal 51S from switch 51.
is supplied, and its output signal 55S is supplied to the servo circuit 43. In the servo circuit 43, the output signal 4 from each part
The drive of the motor 31 is controlled based on 5S, PGS, VP and 55S. 61 is a magnetic head for recording information on a disk or reproducing information therefrom.

Next, the operation of each part will be explained with reference to FIG.

FIG. 5(A) shows a case where a normal pack is attached. As shown in the figure, when the switch 51 is turned on and its output signal 51S rises, the output signal 53S of the cleaning time setting circuit 53 becomes high level at the same time. As a result, the AND circuit 55 opens and its output signal 55S becomes high level. This output signal 55S is supplied to the servo circuit 43 as a disk rotation instruction signal, and when the six disks start rotating, the detection circuit 47 detects the PG bin 23 every rotation. The pulse signal PGS is supplied to the cleaning pack detection section 59. The detection unit 59 detects the attachment of the normal pack based on the signal PGS, and outputs a high level output signal 59.
S is supplied to the OR circuit 57. When this state continues for a predetermined time Tc, the output 53S of the cleaning time setting circuit 53 falls to a low level. However, the input signal 59S to the OR circuit 57 remains at high level, and therefore the OR circuit output 57S remains at high level.

That is, the disk rotation instruction continues to be output from the antenna circuit 55, and the magnetic disk 3A continues to rotate, and recording or reproduction continues.

Next, Fig. 5(B) shows that cleaning pack 3 is installed! - Indicates the case where As shown in the figure, when the switch 51 is turned on, each of Nos. 14 53S, 57S and 55S is turned on.
- Then, a disk rotation instruction is output. However, since the PG bin is not detected, the detection circuit output PGS, which is the PG bin detection signal, remains at a low level. As a result, the cleaning pack detection signal 59S remains at a low level. Therefore, when the predetermined time Tc, that is, the cleaning time of the head 61 by the cleaning disk has elapsed, the cleaning time setting circuit output 53S
becomes low level, so the OR circuit output 57S becomes low level. As a result, the ant circuit 55 is closed, the output of the disk rotation instruction is stopped, and the rotation of the cleaning disk is stopped. In this way, the magnetic head 61 will not be damaged by unnecessary cleaning. The time set by the cleaning time setting circuit 53 may be 10 seconds or less at 4V degrees.

FIG. 6 shows an overall configuration diagram of an embodiment in which the present invention is applied to an electronic still camera. Here, incident light from a subject (not shown) is transmitted through a lens 71. The light passes through an aperture 73 and a shutter 75 and enters an image sensor 77 . shutter 75
The opening and closing of the shutter is controlled by a shutter control circuit 78. The still image signal for one frame converted into an electric signal by the image sensor 77 is supplied to the signal recording circuit 78 as a time-series image signal that displays brightness and hue corresponding to pixels.

The operation of this signal recording circuit 78 is controlled by a recording control circuit 81. Further, the operation of the image sensor 77 is also controlled by the drive circuit 8.
It is controlled by the recording control circuit 81 via 3. The image signal for one frame supplied to the signal recording circuit 78 is amplified via an amplifier 85 and then sent to a write head 8B disposed on a magnetic disk 87.

The head 88 transfers the supplied image signal to the magnetic disk 87.
Fortune-telling. Here, at the time of this writing,
The magnetic disk 87 driven by the motor 89 must reach a steady writing speed. The drive of the motor 88 is controlled by a servo circuit 91. The servo circuit 91 includes a frequency generator 932 for the motor 89 and a rotational phase detection circuit 85 . Signals from the reference signal generation circuit 97 and the AND circuit 99 are taken in, and the drive of the motor 8θ is controlled based on these signals.

The servo determination circuit 101 detects the magnetic disk 87 based on the PG bin detection signal PGS output from the phase detection circuit 95.
It is determined whether or not the rotational phase of is in a specified phase lock state. Specifically, in this determination circuit, 103 and 104 are monostable multivibrators, and the reference clock pulse vP output from the reference signal generation circuit 97
is supplied to the A terminal of the multivibrator 103, and the resulting Q output 103s is supplied to the multivibrator 1.
04 as the A input, and as a result, a pulse with a predetermined time width is obtained as the Q output +048. This output 104S is
The signals are respectively supplied to one input terminal of a 4-bit shift register consisting of flip-flops 105 to 10B and an AND circuit 1011. The other input terminal of the AND circuit 109 is supplied with the PCC pin output signal PGS, and when the signal 104S and PGS are both at high level, the output signal 108s of the AND circuit 109 becomes high level.

This output signal 109S is supplied to the A terminal of the monostable multi-pipe lake 110, which is the beam/trigger bow. Φtriggerable monostable multi/hebrator +10 Q outputs 11
05 outputs a pulse with a time width determined by CR when the A input, that is, the signal 108S becomes low level. This output signal 110S is used as a reset signal for each flip-flop 105 to 108 of the 4-bit shift register.
Supplied to the terminal. Further, a PG detection signal PGS is supplied to each CP terminal. Q output 104 of monostable multi-bi break 104 as D input of flip-flop +05
S is supplied, and when four or more PC pin detection pulses are input in a phase stable state, the flip-flop 108
Q output 108s rises to high level. In this way, the servo determination circuit 101 determines that the disk rotation is in a phase-locked state when four PC bin detection pulses are detected in succession at a constant period, and outputs a high-level output signal 108S. Output.

This determination circuit output 108s is supplied to an OR circuit 113 and an AND circuit 115. The output signal +17S of the cleaning time setting circuit 117 is supplied to the other input terminal of the OR circuit 113. Cleaning time setting circuit 1
Reference numeral 17 is composed of a monostable multi-by-break, and when the signal St generated by the first stroke of the release button 118 is supplied as six inputs, it outputs a pulse with a time width determined by C-R. The OR circuit output 113S is at a high level only during the period when the pulse output 1173 or the determination circuit output 1083 is at a high level. This output signal 113
s is supplied to one input terminal of the AND circuit 99. The signal Sl is supplied to the other input terminal, and therefore, the AND circuit output 99S is at a high level only when both signals are at a high level, and this signal is supplied to the servo circuit 81 as a disk rotation command signal. On the other hand, AND circuit 115
As mentioned above, the judgment circuit output 10 is connected to one input terminal of the
8S is supplied. The other input terminal receives a signal S generated by the second stroke of the release button 113.
2 is supplied. As a result, the AND circuit 115 operates as a release lock circuit that permits the shutter release operation only in the phase locked state. This AND circuit output 115S is supplied to the shutter control circuit 7 as a shutter release operation permission signal.

FIG. 7 shows the cleaning performance in a camera with such a configuration.
This shows the detection operation. In the same figure, release button 1
When 1111 is pressed, the signal Sl rises. As a result, the output 11? of the cleaning time setting circuit 117? S becomes high level. As a result, the output signal 88S of the AND circuit 88 becomes high level, and serves as a disk rotation instruction signal to the servo circuit 9! supplied to The servo circuit 91 starts the motor 88 by receiving this signal 913S. Here, as described in ii1, since the cleaning disk is not provided with a PG bin, the PG bin is not detected even if the cleaning disk rotates as shown in the figure.

Therefore, no PC pin detection pulse is output from the rotational phase detection circuit 95. As a result, the flip-flop 105~
The output signal 10 of the shift I register consisting of 108
8S will never rise to a high level. Therefore, the AND circuit 115 is kept closed and cannot receive the command signal S2 for shutter release operation even if the command signal S2 is generated.

Next, after the rotation of the cleaning disk continues for a predetermined period of time and the magnetic head 87 is cleaned by this disk, the output signal 11? of the cleaning time setting circuit 117? S becomes low level. As a result, the OR circuit output 113s becomes low level, so the rotation command signal 89S, which is the output of the AND circuit 88, becomes low level. When the servo circuit 81 detects this, the motor 88
Stops driving.

In this way, when it is detected from the PG pin detection signal PGS that the cleaning disk is attached, the rotation of the disk is performed only for a predetermined period Tc (cleaning time). Thereby, it is possible to reliably avoid a situation where the magnetic head 87 is damaged due to rotation of the cleaning disk for a longer time than necessary.

As described in detail, the magnetic disk device of the present invention is designed so that the cleaning disk is not provided with a PC bin serving as a phase generator provided in the magnetic disk body to detect the rotational phase of the magnetic disk. No, it is determined whether the attached disk back is a cleaning back or not based on the presence or absence of this PG pin, and if it is a cleaning back, the disk is rotated only for a predetermined period, so cleaning of the magnetic head is performed. There is an advantage in that it is possible to avoid the problem of the magnetic head being worn out due to a longer time than necessary.

[Brief explanation of the drawing]

FIG. 1A is a plan view showing a cleaning back according to an embodiment of the present invention, FIG.
B) is a partial sectional view showing a portion including the center core of the magnetic disk, FIG. 3 is a line diagram showing a detection mechanism for detecting a PC pin, and FIG. 4 is a block diagram showing the overall configuration of an embodiment of the present invention. 5(A) and 5(B) are timing charts showing the operation of each part in FIG. 4, FIG. 6 is a block diagram showing an example of a still electronic camera to which the present invention is applied, and FIG.
This figure is a timing chart showing the operation of the camera of FIG. 6 when detecting a cleaning pack. DESCRIPTION OF SYMBOLS 1... Cleaning pack main body, 3... Cleaning disk, 3A... Magnetic disk, 15... Center core, 17... Centering part of magnetic disk, 23...
PG pin, 31... Motor, 38... PG pin detection section, 40... PG pickup yoke, 41... PC pickup coil, 43... Servo circuit, 47... Rotation phase detection circuit, 51... Switch, 53... Cleaning time setting circuit, 55... AND circuit, 57... OR circuit, 59... Cleaning pack detection section, 61... Magnetic head, 51S, 53S, 55S , 57S, PGS, VP-...
signal. Figure 1 Procedural Amendment April 5, 1980 Mr. Kazuo Wakasugi, Commissioner of the Patent Office ■, Small Case Indication Patent Application No. 59-25757 2, Name of Invention Cleaning Disk Pack and Magnetic Disk Device Using the Same 3; Relationship with the case of the person making the amendment Patent applicant (520) Fuji Photo Film Co., Ltd. 4, Agent address 6, Akiyama Building 9F, 2-3-22 Toranomon, Minato-ku, Tokyo 105, Japan Subject of amendment Drawings

Claims (1)

[Claims] 1) A magnetic disk pack in which a magnetic disk is rotatably housed in a package is installed in a magnetic disk device, and a rotational phase signal generator provided on the magnetic disk is detected to detect the rotation of the magnetic disk. A cleaning disk pack for cleaning the magnetic head by being attached to a magnetic disk device that controls the phase and records or reproduces information on the magnetic disk using a magnetic henode, the pack having the same shape as the magnetic disk. 1. A disk pack comprising a cleaning disk for cleaning a magnetic head, which does not have a rotational phase signal generating section, and a package rotatably housing the cleaning disk. 2) A magnetic disk pack containing a magnetic disk or a magnetic disk rotatably housed in a package is installed in a magnetic disk device, and a rotational phase signal generator provided on the magnetic disk is detected to control the rotational phase of the magnetic disk. While rotating,
In a magnetic disk device that records or reproduces information on a magnetic disk using a magnetic head, a cleaning disk for cleaning a magnetic head that has the same shape as the magnetic disk and does not have a rotational phase signal generating section, and the cleaning disk When a cleaning pack having a package for rotatably accommodating a magnetic disk is loaded and the rotation phase signal is not detected after rotation of the magnetic disk, the cleaning disk is rotated for a predetermined time and then stopped. A magnetic disk device characterized by being provided with a mechanism.