JPS62267966A - Protecting device for magnetic disk in still picture recording device - Google Patents

Abstract

PURPOSE:To evade the contact of a magnetic head with a magnetic disk, and to protect the magnetic disk, by timing the continual time of a state where no picture recording is performed, transferring the magnetic head to a prescribed waiting position at an area other than a picture recording area, and stopping the rotation of a disk motor. CONSTITUTION:A stop mode setting flag is provided in the memory of a control device 50. When a stop key 34 is depressed, a stop mode setting flag is set, if it is not set, and a 10min timer is started. If the setting flag has been set, the depression of the stop key 34 is decided as the second depression, and the control device 50 makes a head transfer device 57 move a magnetic head 51 to the outside, and when the magnetic head 51 arrives at a home position HP, the rotation of a disk motor 54 is stopped. After the time up of the 10min timer, the same process is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Summary of the Invention When a predetermined state in which recording is not performed continues for a certain period of time or more, the magnetic head is moved to the home position and the rotation of the magnetic disk is stopped. Also, the input from the neutral mode setting switch is repeated twice (
(meaning there is no other key input in between), the same operation as above is performed. In this way, a situation in which the magnetic head contacts the recording area and the magnetic disk continues to rotate even though no recording is being performed is eliminated, and the magnetic disk is protected.

, g Next (1) Background of the invention (2) Outline of the invention (2, j>Object of the invention (2,2) Structure and effects of the invention (3) Description of embodiments (3,1>Still image recording and reproducing device Appearance (3, 2) Operation modes and their transitions (3, 3) Electrical configuration and operation of the still image recording/playback device (3, 4) Protection processing for magnetic disks (1) Background of the invention A still image or image that records a single frame (one image or one screen) of a continuous video shot by a camera, or a video signal of a single frame of a dynamic image displayed on a television receiver on a magnetic disk. The present invention relates to a recording device, and particularly to a device for protecting a magnetic disk used for recording video signals in a still image recording device.

When this still image recording device is used to record one frame on the screen of a television receiver.

A video signal output terminal of the television receiver is connected to a video signal input terminal of the recording device. Further, the video signal output terminal of the recording device may be connected to the video signal input terminal of the television receiver. This is mainly.

This is to display on the television receiver a one-frame still image recorded when the recording device has a playback function.

Therefore, normally, the video signal of the television receiver bypasses the recording device, and the television receiver displays the received video except during playback.

Since the television receiver is projecting the received image, the operator of the recording device may become absorbed in the image on the television receiver with the recording device turned on and forget to stop the operation of the recording device. There is. If the still image recording and reproducing device is powered on, the magnetic disk loaded therein continues to rotate, and the magnetic head is naturally in contact with the rotating magnetic disk. If such a state is left untreated, there is a risk that the video signal recording on the magnetic disk will be destroyed.

(2) Summary of the Invention <2.1) Purpose of the Invention An object of the present invention is to make it possible to protect a magnetic disk with a simple operation.

(2, 2) Structure and Effects of the Invention The present invention provides a disk motor for rotationally driving a magnetic disk on which tracks of titles are set concentrically, and a magnetic disk for recording an input video signal on a predetermined track. In a still image recording device that holds a head movably in the radial direction of a magnetic disk and has a biased magnetic head transfer device that moves the magnetic head a predetermined distance in a predetermined direction, the duration of a predetermined state in which recording is not performed. a means for timing the time, and a means for controlling the magnetic head transfer device to transfer the magnetic head to a predetermined standby position outside the recording area on the magnetic disk when the duration elapses over a predetermined constant time, The present invention is characterized in that it includes a control means for later stopping the rotation of the disk motor.

The magnetic disk protection device according to the present invention also includes means for storing that a neutral mode setting switch has been input, and a means for storing that a neutral mode setting switch has been input when a neutral mode setting switch has been input. Preferably, activation means are provided for activating the control means in response to this.

According to this invention, a predetermined state B in which recording is not performed
(For example, recording standby mode in the embodiment, neutral to stop mode) continues for a certain period of time, or if the neutral mode setting switch is turned on twice in a row, the magnetic head immediately returns to a predetermined position outside the recording area. Since the rotation of the magnetic disk is stopped while the magnetic disk is being transferred, the situation where the magnetic head comes into contact with the magnetic disk that is rotating once with very simple operation or no operation can be avoided, and the magnetic disk can be protected.

Hereinafter, an embodiment in which the present invention is applied to a still image recording/playback device will be described in detail.

(3) Description of Embodiments (a, t) Appearance of Still Image Recording and Reproducing Apparatus FIG. 1 shows the external appearance of the still image recording and reproducing apparatus, particularly its front operation panel.

On the left side of the front operation panel U of the still image recording and reproducing apparatus 10, a packet 13 for storing a disk pack 2o and its cover 12 are rotatably supported at their lower ends. By pressing the eject button (so-called eject button) 1B.

The closed cover 12 and packet 13 are mechanically opened as shown in chain lines. Pressing the cover 12 closes and locks the cover 12 and packet 13. Further to the left side of the cover 12, a power button 14 and its indicator light 15 are provided.

The disk pack 20 is a thin, small-diameter magnetic disk 2I.
It consists of a case that rotatably accommodates the . A circular opening 22 is formed approximately in the center of the case, and the hub or core at the center of the magnetic disk 21 can be exposed through this opening. The disk pack 20 is further provided with a shutter 23 movable in a direction parallel to one side thereof. This shutter 23 is opened when the disk pack 20 is inserted into the packet 13, and a regulating plate 53 and a magnetic head 51 (see FIG. 4), which will be described later, can come into contact with the magnetic disk 21 inside. A claw 24 for preventing erroneous recording is provided on one side of the case of the disk pack 20.

The magnetic disk 21 is provided with an imaginary number (for example, 50) tracks (for example, a track pitch of 10 μm) concentrically, and each track contains an FM-modulated color video signal (luminance signal) for one image (one frame). , chroma signals, etc.) can be magnetically recorded.

FIG. 2 shows the relationship between the tracks provided on the magnetic disk 21 and the home position HP of the magnetic head. The 50 tracks arranged concentrically on the magnetic recording surface of the magnetic disk are numbered in order from the outside.
Tracks Nα from 1 to Nα50 are attached.

The area where these tracks are provided is the recording/reproducing area. The home position HP is outside the track of Nα1. This home position HP is magnetic disk 2
1, but is an extreme position assigned on the movement path of the magnetic head. Home position H
P is sensed by home position switch 84 (see FIG. 4).

Referring again to FIG. 1, a half of the front operation panel 11 is provided with two indicators 17 and various key switches and indicator lights. The display 17 is, for example, a liquid crystal display, and shows the track Nα of the magnetic disk 21 where the magnetic head 51 is currently located, various warnings (indicated by 17a), and the information that the disk pack 20 is contained in the packet 13 and the packet. With back indicating that 13 is closed (1
7b) is displayed.

The key switches include keys 31, 32, 33, 34, 35 and 3B for instructing various operations, keys 41, 42, 43 and 44 for setting various modes,
There are keys 18 and the like for setting automatic forwarding time in playback mode. Indicator lights 45, 48, 47 are keys 41, 4
2 and 43, and when these keys are pressed, the corresponding indicator lights are lit. The functions of these key switches will become clear in the next section, ``Operating modes and their transitions.''

(3, 2) Operation modes and their transitions As the name suggests, the still image recording and reproducing device is capable of recording and reproducing still images. When a video signal is recorded on the above-mentioned magnetic disk 21, it is possible to reproduce the entire recorded track. Reproduction means reading an FM modulated signal from a predetermined track of a magnetic disk using a magnetic head, demodulating it, and outputting a standard color television video signal in NTSC format or the like. If the output terminal of this video signal is connected to a television receiver, the reproduced still image will be displayed on the cathode ray tube. Recording assumes input of standard color television video signals. This video signal may be provided by, for example, a television camera or television receiver. Recording involves FM modulating one frame of a given video signal and writing it onto a predetermined track on a magnetic disk using a magnetic head.

When displaying a screen on a television, interlaced scanning is generally performed, so a video signal is created so that one frame consists of two fields.

However, in still image recording devices such as the above-mentioned electronic still cameras, in order to save the recording surface of the magnetic disk for recording video signals, and for other purposes, the magnetic disk is In many cases, video signals are recorded in the field.This is called field recording.The above-mentioned method of obtaining one frame of image with two fields is called frame recording.In this embodiment, field recording is performed. However, it goes without saying that the present invention can also be applied to frame recording.

There are three recording modes: single-frame recording, recording review, and snapshot. In the recording mode (more specifically, the recording standby mode to be described later), the magnetic head must be kept on standby in an unrecorded track of the magnetic disk. When 1 frame recording is selected, 1 frame (1 field)
A video signal for 20 minutes is recorded on that track, and immediately thereafter the magnetic head moves to the next (inner) track and waits. In recording review mode, after recording one frame worth of video signal on the track,
Immediately, the video signal recorded on that track is reproduced and output for a certain period of time (for example, 2 seconds), and then the magnetic head moves to the next track and waits. In the continuous shooting mode, the above-described one-frame recording operation is performed continuously (for example, about 6 to 8 times per second).

The above-mentioned recording operations and other operations will be explained with reference to FIG. 3 in relation to the various keys shown in FIG. 1.

(corresponds to stop mode and neutral mode), 1
Frame key 43. Review key 42 or continuous shooting key 4
When 1 is pressed, the corresponding indicator light 47, 48 or 45 lights up, the pressed key is memorized, and the device enters the recording standby mode. Then record key 33
When is pressed, a one-frame recording operation is performed if there is a memory that the one-frame key 43 was pressed, and a recording review operation is performed if there is a memory that the review key 42 was pressed. After these operations, the device returns to recording standby mode again. If the record key 33 is pressed while there is a memory of pressing the quick copy key 41, the quick copy operation is performed while the record key 33 is pressed, and when the record key 33 stops being pressed, the mode returns to recording standby mode. .

In order to prevent double recording on one track, if any signal has already been recorded on the track where the magnetic head is located, the various recording operations described above are prohibited and the actions of the 1 indicator lights 45 to 47 are disabled. Things flicker. Whether a signal is recorded on a track is determined by the envelope detection output, which will be described later.

In such a case, the forward key 32 or reverse key 31 can be pressed to move the magnetic head to the adjacent inner or outer track. This is track feed mode. Each press of one of these keys 31 and 32 advances the magnetic head one track at a time, and then returns to the recording standby mode.

However, it is also possible to search for the next unrecorded track after recording the video signal in each recording operation.

When erasing the signal of a recorded track.

From the stop mode, press the 1-frame key 43 and press the erase key 44.
Just press . When the erasing process for that track is completed, it returns to recording standby mode.

When the stop key 34 is pressed from recording standby mode, the @air head will move outward (unless erasing has been performed).
(in the opposite direction) by one track and returns to stop mode.

This is because in the three recording modes described above, the magnetic head is moved inward (forward direction) by one track after recording.

When the forward key 32 or reverse key 31 is pressed from the stop mode, the mode shifts to the playback mode, and the video signal recorded on the track where the magnetic head is located is played back. If the forward key 32 or the reverse key 31 is pressed again, the magnetic head is sent to one track inside or outside, and the signal of that track is reproduced. Automatic feed key 3
5 is pressed and the automatic feed time is set by key group 18.

The magnetic head is sequentially moved in the forward direction at set time intervals, and each track is reproduced. Also, when the track number display key 36 is pressed.

Since a signal for displaying the track number on which the magnetic head is located is superimposed on the reproduced video signal and output, the track N (L) is displayed in the upper right corner of the screen of a cathode ray tube, for example. When key 34 is pressed, the system returns to stop mode.

In any of the above modes, the track number where the magnetic head is currently located is displayed on the display 17.

When the stop key 34 is pressed from the playback mode or recording standby mode, the mode returns to the stop mode as described above, but the magnetic disk 21 remains rotationally driven and the magnetic head is in contact with a predetermined track. When this state is left for a certain period of time (for example, 10 minutes), the magnetic head returns to the home position HP and then the rotation of the magnetic disk 21 is stopped (magnetic disk protection processing). Also, +4
If the Stop 1-key 34 is pressed twice in a row while in live mode or recording standby mode (meaning no other keys are pressed in between, they do not have to be close in time), the above Magnetic disk protection processing is performed. That is, the magnetic head is returned to the home position HP.
After that, the rotation of the magnetic disk 2I is stopped. When the magnetic head is at the home position HP, the display 17
0 is displayed as the track Nα.

Preferably, even if the apparatus is in the recording standby mode and the record key 33 or erase key 44 is not pressed twice within the above-mentioned predetermined period of time, the double magnetic disk protection process is performed.

In the initial state when the power is turned on by the power switch 14, the magnetic head is once returned to the home position HP, and then moved inward by a predetermined distance and positioned on track No. 1.

In the recording mode, the magnetic head is moved in a so-called absolute track number system. In other words, the Ia head is moved in the radial direction of the magnetic disk, or always based on the home position HP, 6! The position of each track on which the i-head is to be positioned is defined by its distance from the home position HP.

In the iJG raw mode, after the approximate position of the magnetic head is determined by the above-mentioned absolute track number formula,
Fine position control is performed so that the center of the magnetic head is located at the center of the recorded signal based on envelope detection, which will be described later.

(3, 3) Electrical structure and operation of still image recording and reproducing apparatus FIG. 4 shows the electrical structure of the still image recording and reproducing apparatus.

The overall operation of this still image reproduction device is supervised by a control device 50. This control device 50 is a central processing unit, preferably a microprocessor (hereinafter referred to as CPU).
, a memory for storing its programs and necessary data, and an interface between each peripheral element circuit, device, etc.

When disk back 20 is placed in packet I3 and packet 13 is closed, magnetic disk 21 within disk back 20 is loaded onto the spindle of disk motor 54. Since recording or reproduction is performed by the magnetic head 51 while the magnetic disk 21 is being rotated, there are regulations in the cover 12 to maintain good contact between the magnetic head 51 and the magnetic disk 21 at all times. A plate 53 is provided. This regulating plate 53 has a groove along the moving path of the magnetic head 51, and touches or approaches the magnetic disk 21 at a portion other than the groove, so that the magnetic disk 21 is sandwiched between the regulating plate 53 and the magnetic head 51. As described above, the magnetic head 51 is disposed so as to be movable in the radial direction of the magnetic disk 21 and is in contact with the magnetic recording surface of the magnetic disk 21. Further, a magnetic body is provided at one location of the core of the magnetic disk 21 to leak a part of the magnetic flux of the chucking permanent magnet provided in the core,
A phase detector 52 detects this leakage magnetic flux and generates one phase detection pulse PG for each rotation of the magnetic disk 21.
is close to the core.

The phase detection pulse PC of the phase detector 52 is input to the servo control circuit 56 and the control device 50. A frequency generator 55 provided in the disk motor 54 outputs a signal with a frequency proportional to the number of rotations of the motor 54, and is applied to a servo control circuit 56. Furthermore, this servo control circuit 56
A vertical synchronization reference signal rerV is input to the . Based on such an input signal, the servo control circuit 56 controls the disk motor 54 at a constant rotation speed, for example, 3.00
, p and m, and control the rotational phase of the motor 54 so that the U pulse PG advances 7H from the rise of the reference signal rcfV as shown in FIG.
H is the period between two consecutive horizontal synchronization signals). Further, the servo control circuit 56 starts and stops the motor 54 in response to commands from the control device 50.

The phase control of the motor 54 by the servo control circuit 5B has the following meaning. Consider a case where an FM* and M video signal is recorded on a predetermined track of the magnetic disk 21 by the magnetic head 51. A standard format color video signal applied to the input terminal 60 from a television camera, television receiver, etc. is subjected to FM modulation of its luminance signal component and chroma signal component in the recording processing circuit θl, and these modulated signals are combined and sent to the amplifier circuit. 83. This amplified FM modulation signal passes through the recording control switch 64 and the recording/reproduction changeover switch 05 to the magnetic head 5L.
,:Given. On the other hand, horizontal and vertical synchronization signals of one input video signal are extracted by a synchronization separation circuit 61a and provided to a waveform shaping circuit 66. As shown in FIG. 5, the waveform shaping circuit 66 creates a base signal ratV having a leading edge synchronized with the leading edge of the input vertical synchronizing signal V5ync and having a duty ratio of approximately 1/2. This is what is output. This basic signal rerV is given to the servo control circuit 56 via the synchronization changeover switch 68 (this is called external synchronization). Therefore, recording of the vertical synchronization signal starts on the magnetic disk 21 from a reference position that is shifted by a rotation angle corresponding to a period of 7H from the position of the above-mentioned magnetic body that generates the 9-phase pulse F'G. In this way, video signals are recorded.

In the case of reproduction, a similar vertical synchronization reference signal rcfV is applied from the single oscillation circuit 67 to the servo control circuit 56 via the switch 68 (this is called internal synchronization). By controlling the phase of the motor 54 using the base thread signal rcf'V and the phase pulse PG by the servo control circuit 5G, the magnetic head 5L reads out a video signal in which the vertical synchronization signal always starts 7H behind the PG. become.

The phase pulse PG is given to the control device 50, and since the video signal is synchronized with this pulse PG with a certain delay in both recording and reproduction, the control device 50 uses this pulse to control timing in various processes. This can now be done using PG as a reference. This is the significance of the trI control of the motor 54.

The modulated video signal read from the magnetic head 51 is as follows.

The signal is inputted to the amplifier circuit 73 via the changeover switch 65, and further sent to the reproduction processing circuit 71 and envelope detection circuit 72. The reproduction processing circuit 71 demodulates and synthesizes the modulated luminance signal and chroma signal inputted thereto, and outputs the resultant signal to the output terminal 70 as a standard color video signal. When this video signal is applied to a television receiver, a still image for one frame is displayed on a cathode ray tube.

The erase signal generation circuit 62 generates an erase signal,
For example, 4.5~20MH for a certain period of time (about 1 second)
A signal whose frequency is continuously swept over about z is generated.

The magnetic head 51 is supported movably in the radial direction of the magnetic disk 21 and is controlled to be moved in the same direction by a transfer drive control device 57. The control device 50 controls the magnetic head 5
1 to the device 57 regarding the direction of transport and the transport. The device 57 includes a step motor, and the magnetic head 51 is moved in proportion to the rotation angle of the step motor. For example, each step motor drive pulse rotates about 15 inches, thereby moving the magnetic head 51 about 8.33 μm (1 pitch).

Therefore, the magnetic head 5L is moved very accurately.

The envelope detection circuit 72 is a detection circuit that detects the envelope of the read signal of the magnetic head 51, that is, the FM modulated video signal recorded on the track of the magnetic disk 21, and outputs a voltage signal corresponding to the envelope. be.

The voltage signal representing the envelope is converted by an analog/digital converter (A/D converter) built into the circuit 72 into an 8-bit digital signal representing a quantization level of, for example, 25B, and is input to the control device 50. do.

The envelope detection signal is used to search for unrecorded tracks on the magnetic disk 21 and to detect the center position of recorded tracks (in playback and erase modes). If the level of the detected signal does not reach a predetermined threshold level when the magnetic head 5L is moved across the track, that track is unrecorded. When reproducing a video signal, after the magnetic head 51 is positioned by the above-mentioned absolute positioning method, the magnetic head 51
is moved inward or outward one pitch at a time, the position where the detected signal shows a peak is searched, and the position where this peak is shown is determined to be the center of the track where the video signal is recorded, and the magnetic head 51 is moved. The video signal is reproduced in this centered position. This peak search is performed in the same way to erase the video signal,
Areas within a certain range on both sides of the peak position are subject to deletion.

Recording control switch 84. Record/playback switch 65,
Synchronization changeover switch 68 and video output control switch 69
Although shown as a contact switch, it is of course generally realized by a non-contact switch made of a semiconductor element cap. These switches are controlled to be turned on and off by the control device 50 as follows.

In the recording mode, the switch 64 is turned on at a certain timing, and the switch 65 is turned on at a certain timing, with exceptions described later.
is connected to the recording processing circuit 61 side.

The switch 68 is connected to the waveform shaping circuit 6B side, and the switch 69 is turned on. That is, when the recording standby mode is entered, the changeover switches B5 and 68 are respectively switched as described above by the recording/playback switching signal REC/PB and the synchronization switching signal 5YCH from the control device. In addition, switch B9 is connected to the video output control signal VIDCH.
is turned on by When the recording key 33 is pressed, the switch 64 is turned on by the recording control signal REC only between two consecutive pulses PG, as shown in FIG. Therefore, the FM modulated video signal is sent to the magnetic head 51 during this time.

One rotation of the magnetic disk 21 records one field. At this time, since the switch 69 is on, the video signal input to the input terminal 60 is output to the output terminal 70 as is.

When the recording review 42 is stored (recording review mode), playback is performed after recording as described above. Therefore, when the recording by the magnetic head 51 is completed, the switch 65 is activated by the reproduction processing circuit 7 in synchronization with the PG double signal.
1 side and the switch 69 is turned off. Therefore, the video signal read by the magnetic helad 51 is outputted from the output terminal 70 as a reproduction output. Then, after a certain period of time, these switches 85, 89 return to the above-mentioned state again.

Even during the above-described reproduction in the recording review mode, the changeover switch 68 remains connected to the waveform shaping circuit GG side, and external synchronization is performed. That is, since a video signal is input to the input terminal 60, servo control is performed based on the synchronization signal.

As will be shown later, in the playback mode, the switching switch 68 is connected to the oscillation circuit 67 side to provide internal synchronization, but during playback in the recording review mode, switching from external synchronization to internal synchronization is not performed.

External synchronization continues consistently. This means that when switching from external synchronization to internal synchronization, the disk motor 54
This is because the rotational phase of is temporarily shifted, causing distortion in the video signal output from the output terminal 70 and causing disturbance in the image displayed on the cathode ray tube.

In the erase mode, the states of switches 134, 85, 68 and 69 are the same as in the record mode.

In the reproduction mode, switches 64 and 69 are kept off, switch 65 is switched to the reproduction processing circuit 71 side, and switch 68 is switched to the oscillation circuit 67 side.

In the stop mode, switch 69 is on and switches 85 and 68 are connected to the playback side. However, the reproduced output is not output to the output terminal 70, and the video signal input to the terminal 60 is output as is.

All operation mode switching and various operations are performed based on inputs from various switches and various keys. The various switches have packets 13 and magnetic disks 21 in them.
The load end switch 81 detects that the disk pack 20 is closed to the point i2 where it will be securely attached to the spindle of the disk motor 54, and the disk pack 20 is housed in the closed packet 13. A pack switch 82 that detects the An erroneous recording prevention switch 83 detects that the erroneous recording prevention claw 24 of the disk pack 20 housed in the packet 13 has been removed and does not exist (that is, recording is prohibited). These include the home position switch 84 mentioned above. The various keys include key groups 31 to 36, 41, . . . 44, and 18 provided on the front operation panel 11 described above. The control device 50 operates at a constant cycle (1
A key scan routine is performed every 60 seconds), and in this key scan routine, the control device F15
0 sends a keyskiton pulse to the above-mentioned switch group and key group, and detects and stores the on/off states of the switches and keys depending on whether this pulse is returned.

Furthermore, the control device 50 also performs display control of the indicator lights 45 to 47 based on the above-mentioned key scan routine, display control of the display "2H17" based on various operation routines, and the like.

(3, 4) Magnetic Disk Protection Process FIG. 6 shows part of the process performed when it is detected that the stop key 34 is on in the "double key scan routine". A stop/I-mode setting flag is provided in the memory of the control device 50. When the stop key 34 is pressed, it is determined whether this flag is set (step 101), and if the stop mode setting flag is not set, this flag is set (step 102), and a 10-minute timer is started. (Step l03). The 10 minute timer may be provided externally to the control device 50 or
It is also possible to use a predetermined area of the internal memory as a timer. This 10 minute timer is activated by pressing the stop key 3.
It is reset when any other key is pressed, including 4.

Further, the stop mode setting flag is reset when a key for transitioning to another mode is pressed.

If the stop mode setting flag has already been set, it is determined that the stop key 34 has been pressed for the second time, and the control device 50 gives a command to the head transfer device 57 to move the magnetic head 51 outward (step 104). ).

Specifically, the steps from the control device 50 to the transfer device 57 are
A shift pulse is applied to the motor. magnetic head 51
When the key scan routine detects that the home position switch 84 has reached the home position HP and the home position switch 84 has been turned on, the output of the shift pulse from the control device 50 is stopped and the servo control circuit 56 is turned on. Since a command to stop the disk motor 54 is given from the control device 50, the rotation of the disk motor 54 is stopped (step 105). The stop mode flag may be reset when moving from step 101 to step 104.

When the 10 minute timer times up, its interrupt signal is generated and the processing of steps 104 and 105 described above is performed in the same manner. The process of step 104 is as follows.

It is preferable to perform this after confirming that the magnetic head 51 is not at the home position HP.

As described above, when 10 minutes have elapsed since the stop key 34 was pressed, and when the stop key 34 was pressed twice in succession, the magnetic head 51 is returned to the home position HP, and r! By stopping the 11 dia large disk 21, the magnetic disk 21 is protected.

After this, if any key other than the stop key 34 is pressed.

The process moves on to the process corresponding to the pressed key as described above. However, when the magnetic head 51 is at the home position HP, only the forward rekey 32 or reverse key 31 is allowed to be pressed, and if any other key is pressed, a warning message 1 is displayed.
7a is performed. When the forward key 32 is pressed, the mode shifts to playback mode. That is, the magnetic head 51 is No.
The video signal is transferred to track 1 and the video signal of that track is reproduced. If the reverse key 31 is pressed, No,
Video signals of 50 tracks are played back.

After being set to recording standby φ mode, a certain period of time (
If the record key 33 or erase key 44 is not pressed for a period of 10 minutes, the above magnetic disk protection process can be performed as follows. That is, the 10-minute timer is started when any one of the single frame, review, or continuous shooting keys 43, 42, or 41 is pressed. After this, the 10 minute timer is reset and restarted when the jj stroke 33 or the erase key 44 is pressed. When this 10 minute timer is up during the time, the 6th
The processing of steps 104 and 105 in the figure is performed.

In both the stop mode and the recording standby mode, the switch 69 is on and the input video signal at the input terminal 80 is output as is to the output terminal 70.
When this output terminal 70 is connected to a television receiver, an image based on this input video signal will appear on the television receiver, and the operator will be engrossed in the images on the television receiver, as shown in series -1. Therefore, the user may forget to stop the operation of the still image recording/playback device. However, in such a case, the magnetic disk is protected by the above-described magnetic disk protection process.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance of a still image recording and reproducing device. FIG. 2 shows the track numbers and home positions on the magnetic disk. FIG. 3 shows various operating modes and how the operating modes change in response to inputs from various keys. FIG. 4 is a block diagram showing the electrical configuration of the still image recording and reproducing device. FIG. 5 is a time chart showing the synchronous control of the disk motor by the servo control circuit and the recording timing. FIG. 6 is a flow chart showing the procedure of magnetic disk protection processing by the CPU. lO: Still image recording/playback device. 21...Magnetic disk, 34...Stop key. 50...Control device, 51...Magnetic head. 57...Head transfer drive control device. that's all

Claims (2)

[Claims] (1) A disk motor for rotationally driving a magnetic disk on which multiple concentric tracks are set, and a magnetic head for recording an input video signal on a predetermined track, which is movable in the radial direction of the magnetic disk. Further, in a still image recording apparatus equipped with a magnetic head transfer device for moving the magnetic head by a predetermined amount in a predetermined direction, there is provided a means for measuring a duration of a predetermined state in which recording is not performed, and a means for measuring the duration of a predetermined state in which recording is not performed, Controlling the magnetic head transfer device to transfer the magnetic head to a predetermined standby position outside the recording area on the magnetic disk when a certain period of time has elapsed, and stopping the rotation of the disk motor after this transfer. 1. A magnetic disk protection device in a still image recording device, comprising: means. (2) A switch for neutral mode setting input, a means for remembering that there was a neutral mode setting switch input, and a neutral mode setting switch input if there is a memory that there was a neutral mode setting switch input. Claim No. (1) characterized in that it is provided with: activating means for activating the control means in response to the above.
A protection device for a magnetic disk in a still image recording device according to paragraph 1.