JPS62270063A - Still picture recorder - Google Patents

Abstract

PURPOSE:To prevent a double recording and to protect recorded information by generating an output inhibiting the recording of a picture to the input of a picture recording command by a track where a magnetic head is positioned, when a video signal is already recorded. CONSTITUTION:When one frame key 43, a review key 42 or a quick photographing key 41 is pushed, the recorded flag is checked and processed, and when the flag is reset, the picture recordable flag of a memory is set and a picture recording standby mode setting (changing-over of changing-over switches 65 and 68 and ON of switch 69, etc.,) is executed. On the other hand, when the recorded flag is set, the picture recordable flag is set and a pilot lamp corresponding to pushed keys 41-43 of pilot lamps 45-47 flickers. Thus, when the track is already recorded in which a magnetic head 51 is positioned, the picture recording to the track can be prohibited.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention Summary of the Invention In order to prevent double recording on a track on a magnetic disk where a video signal has already been recorded, a magnetic head is positioned on a track where a video signal is already recorded. It is determined whether a video signal has already been recorded, and if so, recording on that track is prohibited.

Table of contents (1) Background of the invention (2) Overview of the invention (2, 1) Purpose of the invention (2, 2) Structure and effects of the invention (3) Description of embodiments (3, 1>Still image recording/playback device Appearance (3, 2) Operation modes and their transitions (3, 3) Electrical configuration and operation of still image recording/playback device (3, 4) Recording processing (1) Background of the invention Further, the present invention relates to a static image recording device that records a video signal on an arbitrary track by moving a magnetic head in the radial direction of a rotating magnetic recording medium (hereinafter referred to as a magnetic disk) having a plurality of recording tracks for recording, and further Specifically, it is possible to record one image of a video signal output from a television camera, television receiver, etc. onto the above-mentioned magnetic disk, and to use a still image recording/playback device that has a playback function, or a solid-state electronic imaging cable. The present invention relates to a still image recording device including an electronic still camera or the like that records still images of a photographed subject on a magnetic disk.

This type of still image recording device records a video signal for one field on one track of a magnetic disk, or a video signal for one frame over two tracks.
If a new video signal is written to a track where a previously recorded video signal is recorded due to an operational error, the previous video signal will be erased or the video signal will be recorded twice. Therefore, there is a possibility that the current video signal also has no value as still image information.

(2) Summary of the invention (2,1) Purpose of the invention This invention aims to prevent double recording as described above in order to protect still image information that has already been recorded. purpose.

(2,2) Structure and Effects of the Invention The present invention provides an apparatus for recording video signals of still images using a magnetic head on a rotating magnetic disk in which a plurality of recording tracks are set. A means for determining whether or not a video signal is being recorded, and a means for outputting a signal indicating that recording is not possible when it is determined that a video signal is being recorded and there is human power to instruct recording. It is characterized by the presence of

According to this invention, when a video signal is already recorded on the track where the magnetic head is located.

When a recording command is input, an output indicating that recording is not possible is generated, so this output can be used to prohibit recording or display that recording is not possible, preventing double recording, and changing the recorded information. Protection will be provided.

Hereinafter, an embodiment in which the present invention is applied to a playable recording device, that is, a still image recording and playing device will be described in detail.

(3) Description of Embodiments (3.1) 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 11 of the still image recording and reproducing apparatus 10, a packet 13 for storing a disk pack 20 and its cover 12 are rotatably supported at their lower ends. Eject button (so-called eject button)
The cover 12 that was closed by pressing the button) 16
and the packet 13 is mechanically opened as shown in dashed lines. If you press the cover 12, the cover 12 and the packet
13 is closed and locked. Further to the left side of the cover 12, a power button 14 and its indicator light 15 are provided.

The disk pack 20 includes a thin, small-diameter magnetic disk 21.
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 inverse number (for example, 50) of tracks (for example, a track pitch of 100 μm) concentrically, and each track contains an FM-modulated color video signal (luminance) for one image (one frame). signals, chroma signals, etc.) can be magnetically recorded.

In FIG. 2, a magnetic disk 21 is provided! - Shows the relationship between the rack and the home position HP of the magnetic head. The 50 tracks concentrically arranged on the magnetic recording medium of the magnetic disk have NIL recorded in order from the outermost one.
Up to 50 tracks Nα are attached to I~. The home position HP is outside Sou 1's truck. This home position HP is not attached to the magnetic disk 21, but is an extreme position assigned to the moving path of the magnetic head. The home position HP is detected by the home position switch 84 (see FIG. 4).

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

The key switches include keys 31, 32, 33, 34, 35 and 36 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 light 45.46.47 is key 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 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 video signal from the recorded track. Reproducing 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 the static IL of the above-mentioned electronic still camera, etc., in image recording devices, one field is used to save the recording surface of the magnetic disk for recording video signals, and for other purposes.
Video signals are often recorded onto a magnetic disk so as to form a frame (one image). This is called a field record. Furthermore, the manner in which one frame of image is obtained using the two fields described above is called frame recording. In this embodiment, field recording is performed, but 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 quick-shot mode, the above-mentioned one-frame recording operation is performed continuously (for example, at 6 frames per second).
(about 8 times).

Each recording operation and other operations described in "U" will be explained with reference to FIG. 3 in relation to the various keys shown in FIG.

In the stop tL mode, 1-frame key 43. View
When the key 42 or the continuous shooting key 41 is pressed, the corresponding indicator light 47, 46 or 45 lights up, the pressed key is memorized, and the apparatus enters the recording standby mode. Next, when the record key 33 is pressed, the 1-frame key 4
If there is a memory of pressing the review key 42, a one-frame recording operation is performed, and if there is a memory of pressing the review key 42, a recording review operation is performed. 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. .

As will be detailed later, 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. The corresponding ones of the indicator lights 45 to 47 flicker. Whether a signal is recorded on a track is determined by the envelope detection output.

In such a case, the forward rekey 32 or the reverse key 31 can be pressed to move the magnetic head to the adjacent inner or outer track.

This is track feed mode. These keys 31.
Each time 32 is pressed, the magnetic head advances one track and then returns to recording standby mode.

However, in each recording operation, the next unrecorded track may be searched after recording the video signal.

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. The erase mode may be set when a video signal has already been recorded on the track desired to be recorded.

When the stop key 34 is pressed from recording standby mode, the magnetic head will move to the outside (unless erasing has been performed).
(in the opposite direction) for one track and then returns to the 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 using the key group 18, the magnetic head is sequentially fed in the forward direction at each set time, and each track is played back. Furthermore, when the track Nα display key 36 is pressed, a signal for displaying the track on which the magnetic head is located is superimposed on the reproduced video No. 15 and output.
For example, the track number is displayed at the top right of the screen on a cathode ray tube.
, is displayed. When the stop key 34 is pressed, the system returns to the stop 1 mode.

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

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

In the recording mode, the magnetic head is moved in a so-called absolute track number system. That is, although the magnetic head is moved in the radial direction of the magnetic disk, the position of each track where the magnetic head is to be positioned is always determined by the distance from the home position HP, with the position of the home position HP as a reference.

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

(3, 3) Electrical structure and operation of still image recording/playback device FIG. 4 shows the electrical/electrical structure of the still image recording/playback device.

The overall operation of this still image recording and playback device is controlled by the control device 5.
Controlled by 0. This control device 50 is composed of a central processing unit, preferably a microprocessor (hereinafter referred to as CPU), a memory for storing its programs and necessary data, and an interface with each peripheral element circuit, device, etc. There is.

Once the disk pack 20 is placed in the packet 13 and the packet 13 is closed, the magnetic disks 21 in the disk pack 20 are mounted on the spindle of the disk motor 54. Since recording or reproduction is performed by the magnetic head 51 while the magnetic disk 21 is being rotated, a regulating plate 53 is provided within the cover 12 to maintain good contact between the magnetic head 51 and the magnetic disk 21 at all times. It is provided. This regulating plate 53 is.

It has a groove along the moving path of the magnetic head 51, and is in contact with or close to the magnetic disk 21 at a portion other than the groove, so that the magnetic disk 21 is sandwiched between the magnetic head 51 and the magnetic disk 21. The magnetic head 51 is connected to the magnetic disk 2 as described above.
A magnetic disk 2 is arranged so as to be movable in the radial direction of 1.
It is in contact with the magnetic recording surface of No. 1. In addition, the magnetic disk 21
A magnetic material is provided in one place of the core to leak a part of the magnetic flux of the permanent magnet for chucking provided in the core, and this leakage magnetic flux is detected and a magnetic material is inserted every rotation of the magnetic disk 21. A phase detector 52 that generates a phase detection pulse PC is adjacent 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. Further, the servo control circuit 56 is manually supplied with a vertical synchronization reference signal rcrV. Based on such an input signal, the servo control circuit 56 rotates the disk motor 54 at a constant speed, for example, 3° Boor, p, m, and rotates the disk motor 54 at a constant speed of 3° Boor, p, m, as shown in FIG. Pulse PC is reference signal ra
The rotational phase of the motor 54 is controlled so that it precedes the rise of rV by 7H (H is the period between two consecutive horizontal same-bright signals). Further, the servo control circuit 56 starts and stops the motor 54 in response to commands from the control device 50.

The control of the motor 54 by the servo control circuit 56 has the following meaning. Consider a case where an FM-modulated video signal is recorded on a predetermined track of the magnetic disk 21 by the magnetic head 51. Television/Camera 1 A standard format color video signal supplied from a television receiver or the like to the input terminal 60 is subjected to FM modulation of its luminance signal component and chroma signal component in the recording processing circuit 61, and these modulated signals are combined and sent to the amplifier circuit. 63.

This amplified FM modulation signal is applied to the magnetic head 51 via a recording control switch 64 and an amplifier selection switch 65. On the other hand, the horizontal and vertical synchronization signals of the input video signal are extracted by the synchronization separation circuit 61a, and the waveform shaping circuit 66 extracts the horizontal and vertical synchronization signals of the input video signal.
given to. As shown in FIG. 5, the waveform shaping circuit 66 creates a reference signal ref'V 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 reference signal rat'V is applied to the servo control circuit 5G via the synchronization changeover switch 68 (this is called external synchronization). Therefore, a 1-phase pulse PC is generated on the disk 21. Recording of the vertical synchronization signal starts from this reference position, which is offset from the position of the two magnetic bodies by a rotation angle corresponding to a period of 7H. The video signal is recorded in this way.

In the case of reproduction, a similar vertical synchronization reference signal re['V 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 reference signal rerV and the phase pulse PG by the servo control circuit 56, the magnetic head 51 reads out a video signal whose vertical synchronization signal always starts 7H behind PG.

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 phase control of the motor 54.

The modulated video signal read from the magnetic head 51 is input to the amplifier circuit 73 via the 1 selection switch 65, and further sent to the reproduction processing circuit 71 and envelope detection circuit 72. The reproduction processing circuit 71 is.

The manually modulated luminance signal and chroma signal are each demodulated and combined and outputted to the output terminal 70 as a standard color video signal. When this video signal is applied to a television receiver, one frame of still image is displayed on the cathode ray tube.

In the erase mode, the erase signal generating circuit 62 generates an erase signal of 4.5 to 20 M for a certain period of time (about 1 second).
It generates a signal whose frequency is continuously swept over a frequency range on the order of Hz.

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 transfer and the direction of transfer. 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 51 is moved very accurately.

The envelope detection circuit 72 detects the envelope of the signal read by the magnetic head 51, that is, the FM modulated image signal recorded on the track of the magnetic disk 21, and outputs a voltage signal corresponding to the envelope. It is a circuit. The voltage signal representing the envelope is converted by an analog/digital converter (A/D converter) built into the circuit 72 into 87 signals representing, for example, 256 quantization levels.
The signal is converted into a bit digital signal and input to the control device 50.

The envelope detection signal is used to search for unrecorded tracks on the magnetic disk 21, determine whether the track where the magnetic head 51 is located has been recorded, and detect the center position of the recorded track (in playback and erase modes). used. If the level of the detection signal does not reach a predetermined threshold level when the magnetic head 51 is moved across the track or when the magnetic head 51 is positioned on the track, that track is unrecorded. If there is, it is determined that it has been recorded. When reproducing a video signal, after the magnetic head 51 is positioned using the above-mentioned absolute address method, the position where the envelope detection signal shows a peak is searched by moving the magnetic head 51 inward or outward one pitch at a time. The position showing this peak is determined to be the center of the track where the video signal is recorded, and the video signal is reproduced with the magnetic head 51 positioned at this center. This peak search is similarly performed for erasing the video signal, and areas within a certain range on both sides of the peak position are targeted for erasure.

Recording control switch 64. The amplifier selection switch 65, the synchronization changeover switch 68, and the video output control switch 69 are
Although shown as a contact switch, it is of course generally realized by a non-contact switch made of a semiconductor element or the like. These switches are controlled to be turned on and off by the control device 50 as follows.

Before explaining the control of these switches, the selection of the recording processing circuit 61 and the reproduction processing circuit 71 based on the recording/reproduction switching signal REC/PB output from the control device 50 will be described. In the recording mode and the stop mode, both circuits 61 and 71 are powered on, and these circuits 61 and 71 are in a warm-up state. In the playback mode, only the playback processing circuit 71 is powered on;
The power of the recording processing circuit 61 is turned off.

This is because the recording processing circuit 61 includes a high frequency oscillation circuit, and the oscillation output of this circuit adversely affects the circuit 71 during the reproduction process.

Now, let's move on to the explanation of the "-" switch. 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, except for the exceptions described later.
The switch 68 is connected to the waveform shaping circuit 66 side, and the switch 69 is turned on. That is, when the recording standby mode is entered, switches 65 and 6
8 is switched as described above by the amplifier selection signal AMPSLT and the synchronous switching signal 5YCH from the control device 50, respectively. Further, the switch 69 is turned on by the video output control signal VIDCH. 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 disk 51 during this time, and one field is recorded in one rotation of the magnetic disk 21. At this time, the switch 69 is on, so
The video signal input to the input terminal 60 is output as is to the output terminal 70.

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 65, 69 return to the above-mentioned state again.

Even during the above-described playback in the recording review mode, the changeover switch 68 remains connected to the waveform shaping circuit 66, 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 shown later, in playback mode, selector switch 6
8 is connected to the oscillation circuit 67 side for internal synchronization, but during playback in the recording review mode, switching from external synchronization to internal synchronization is not performed, and external synchronization continues throughout. This is because when switching from external synchronization to internal synchronization, the rotational phase of the disk motor 54 is temporarily shifted, which causes distortion in the video signal output from the output terminal 70, causing distortion in the image displayed on the cathode ray tube. This is because disorder occurs.

Even in erase mode, switches 65, 6111 and 6
The state of 9 is basically the same as in the recording mode, but the switch 64 remains on during the erasing operation.

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, the switch 65 is connected to the regeneration processing circuit 7.
Connected to side 1. This is because, as will be described later, in this stop mode, the envelope detection circuit 72 determines whether or not the track that the magnetic head 51 is in contact with has been recorded.
This is because it is performed based on the output of magnetic head 5
1 is also given to the reproduction processing circuit 71, but a switch (not shown) in this circuit 71 prevents the reproduction output from being output to the output terminal 70.

Switching of operation modes and various operations are all performed based on human power from various switches and various keys. The various switches have packets 13 and magnetic disks 21 in them.
is closed to a position where it will be securely attached to the spindle of the disk motor 54.
End switch 81. A back switch 82 that detects that the disk back 20 is contained within the closed packet 13. An erroneous recording prevention switch 83 detects that the erroneous recording prevention claw 24 of the disc back 20 housed in the packet 13 has been removed and does not exist (that is, recording is prohibited). Home position switch 8 mentioned above
There are 4 etc. The various keys include key groups 31 to 36, 41 to 44, and 18 provided on the front operation panel 11 described above. The control device 50 operates at a fixed period (for example, i7e
.

In this key scan routine, the control device 50 sends a key scan pulse to the above-mentioned switch group and key group, and depending on whether or not this pulse is returned, the control device 50 performs a key scan routine.
Detects and stores key on/off status.

Furthermore, the control device 50 controls the display of the indicator lights 45 to 47 based on the above-mentioned key scan routine.

It also controls the display of the display 17 based on routines for various operations. - (3, 4) Recording process Finally, the operation of the above-mentioned recording mode, especially the recording prohibition process for recorded tracks.

The following will explain from the viewpoint of the processing procedure of the CPU in the control device 50.

Before explaining, let's summarize the main conditions for recording.

This is because the track on which the magnetic head 51 is located is unrecorded (the envelope detection output is below the threshold level), and the erroneous recording prevention claw 24 on the disk back 20 is not removed. (This can be determined by the output of the erroneous recording prevention switch 83), and the recording standby mode is in effect (one of the single-frame, review, or snapshot key switches 43, 42, or 41 is pressed). . In order to avoid complexity, the judgment based on the output of the erroneous recording prevention switch will not be particularly mentioned in the following explanation.

FIGS. 6 to 10 show the processing performed when each key is determined to be on by the key scan routine. These processes.

This is an interrupt process in which the results of the key scan φ routine are checked at regular intervals (for example, 10 m5), and if any key is turned on, the process proceeds to the process corresponding to that key.

In FIG. 6, when the stop key 34 is pressed, the two lit or blinking indicator lights 45 to 47 are turned off (step 101), and the stop mode is set (i.e., the stop mode is memorized). , switching of the switch 65, etc.) is performed (S], Te°y2102)・s
:'< O-2 detection processing The reproduced output from the magnetic head 51 from the track where the magnetic head 51 of the magnetic disk 21 is moved by 1 degree, that is, rotated once, is sent to the envelope detection circuit 72 via the amplifier circuit 73. The A/D converted value is input to the control device 50. Control device 5
If this A/D conversion value exceeds a predetermined threshold level, CPU 0 sets the recorded flag F in the memory to 1, and if it is below the threshold level, sets this flag F to 1. The above-mentioned checking process of the recorded flag F is performed to reset the flag F (step 103).

In FIG. 7, one frame key 43. review key 4
2 or the continuous shooting key 41 is pressed, it goes up. If this flag F is reset, memory recording is possible (RE
Cenable) flag is set, and the recording standby mode setting (switching the selector switches 65, 68, turning on the switch 69, etc.) is performed (steps 111 to 11).
3).

When the recorded flag F is set, the recordable flag is reset (RE CDisable).

Of the indicator lights 45 to 47, those corresponding to the pressed keys 41 to 43 flash (steps 111, 114, 1).
15), RECenable is the recording control signal RE described above.
RECdisable functions to enable the output of C and prohibit it.

When the recording key 33 is pressed in this state, the state of the above-mentioned recordable flag is checked with reference to FIG. 8, and if it indicates that recording is possible, recording is performed (steps 121 and 122). That is, when the 1-frame key 43 is pressed.

At the timing of the phase pulse PC, a recording control signal REC is output as shown in FIG. 5, and one frame of the input video signal is recorded on the magnetic disk 21. Thereafter, 12 forward shift pulses are applied to the step motor of the head transfer drive control device 57, and the rotation of this motor moves the magnetic head 51 inward by one track, 100 μm.

When the review key 42 is pressed, the above-mentioned 1
After frame recording processing, playback processing is performed. As described above, this reproduction processing involves turning off the switch 69 for two seconds and switching only the changeover switch 65 to the reproduction side. Thereafter, the magnetic head 51 is moved one track in the forward direction. When the quick copy key 41 is pressed, the above-described one-frame recording and one-track transfer of the magnetic head 51 are continued while the recording key 33 is pressed.

After this, in the same way as step 103 in FIG. 6, an envelope check is performed and the recorded flag F is set or reset based on the check result (step 12.3), and further the recording shown in FIG. Processing is performed on the recordable flag based on the check of the completed flag F. The forward movement of the magnetic head 51 by one track after recording is performed using the absolute track number system.

Envelope detection is also performed at positions determined in absolute track number format.

If the recordable flag indicates RE CDisable, the indicator lights 45 to 47 corresponding to the keys 41 to 43
The blinking process continues (steps 121 and 124).

In this way, if the track on which the magnetic head 51 is located has already been recorded, recording on that track is prohibited.

When recording is prohibited, it is possible to perform recording after erasing the track.

When the erase key 44 is pressed, referring to FIG.
Only when the one-frame key 43 has already been pressed, the corresponding blinking indicator light 47 is turned off and the process proceeds to the erasing process (steps 131, 132, 133). Erasing a track is performed by searching the center of the track using the envelope detection output as described above, activating the erasing signal generation circuit 62 to generate an erasing signal, and applying this to the magnetic head 51 for a certain period of time. . After erasing the center of the track, move the magnetic head 51 slightly from the center of the track (for example, by one shift pulse -8,33μ).
m) Move the magnetic head 51 to the inside and similarly apply an erase signal for a certain period of time, and then carry out the same process by moving the magnetic head 51 from the center of the track to the outside.

Thereafter, the process moves to step 123 in FIG. 8, and processing for envelope detection, recorded flag F, and recordable flag is performed.

If the 1-frame key 43 has not been pressed (step 1)
31), a warning display 17a is displayed.

[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. FIGS. 6 to 9 show an example of the procedure of recording processing by the CPU, and are flow charts showing interrupt processing for keys that are on based on the key scan routine results. 10...Still image recording/playback device. 21...Magnetic disk. 33... Recording key. 41...Snapshot key. 42...Review-key 1 43...1 frame key. 44...Erase key. 50...control device. 51...Magnetic head. 57...Head transfer drive control device. 60...Video signal input terminal. 61... Recording processing circuit. 72...Envelope detection circuit. Patent applicant: Fuji Photo Film Co., Ltd. Agent
Patent attorney Asamichi Kato (
Figure 8 Figure 9

Claims (1)

[Claims] In an apparatus for recording video signals of still images using a magnetic head on a rotating magnetic recording medium in which a plurality of recording tracks are set, whether or not a video signal is recorded on the track where the magnetic head is located. and means for outputting a signal indicating that recording is not possible when a recording command is input when it is determined that a video signal is being recorded.