JPS63306565A - Still image reproducing device - Google Patents

Abstract

PURPOSE:To enable an operator to optionally set reproducing time by executing reproducing operation at least during the operation of a picture recording instruction means from the end of picture recording when a picture recording review mode is set and the picture recording instructing means is operated. CONSTITUTION:A switching means for switching the connection of a magnetic head with the input side of a reproducing processing means or the output side of a recording processing means is controlled so that recording is executed during a prescribed time in response to the operation of the picture recording instructing means 33 when the picture recording review mode 42 for reproducing a recorded image is set by a picture recording mode setting means immediately after the end of picture recording and the means 33 is operated, and at least during the operation of the means 33 from the end of picture recording, reproducing operation is executed. Consequently, the reproducing time can be optionally set on the basis of an operator's purpose.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention rotates a magnetic recording medium such as a magnetic disk on which a video signal representing a still image is recorded, and generates a magnetic field in the radial direction of the magnetic recording medium. The present invention relates to a still image reproducing device that reproduces video signals from arbitrary tracks by moving a head.

[Conventional technology]

Stillness 0! ! An i-image playback device plays back video signals recorded on a magnetic disk by a so-called electronic still camera or video magnetic recording system, and when this playback output is applied to a television receiver, a still image is displayed on the receiver's cathode ray tube. is projected. An electronic still camera is a combination of an imaging device such as a solid-state image sensor and a recording device using a magnetic disk, and is used to electronically photograph a subject and record the still image on a magnetic disk. A video magnetic recording system electronically captures a still image appearing on a visible recording medium such as ordinary film or photographic paper and records it on a magnetic disk.

Such still image playback devices are becoming relatively widespread both as consumer products and for business use, but on the other hand, there is a demand for new functions to be added so that they can be used for more purposes. ing. One of them is the recording function. This is the process by which video signals for one frame (one image or one screen) of a continuous video shot by a television camera or one frame of a dynamic image displayed on a television receiver are stored on a magnetic disk. This is a recording function. It is also desired to be able to immediately confirm whether or not a desired screen has been recorded when a single frame consisting of an image is recorded.

[Problem that the invention seeks to solve]

By the way, the work of playing back and checking recorded images is to check whether there are any dropouts in the recording track of the magnetic disk, or to check whether the shooting was carried out normally (for example, if the person who is the subject is shooting) It is necessary to check the situation (such as closing your eyes for a moment). In this case, if the playback time immediately after recording ends is set to a fixed time, it may feel longer or shorter depending on the content of the recorded image.

For example, if the recorded image is one frame of a video, it will feel short;
If it's a still image, it feels long.

Further, if the recording target is for business use, it is necessary to carefully check the recording, so it is better to make the playback time longer than when playing back a general recorded image.

The present invention was made in view of these circumstances, and
It is an object of the present invention to provide a still image playback device that allows an operator to arbitrarily set the playback time of a recorded image immediately after recording ends.

[Means for solving problems]

In order to achieve the above object, the present invention provides a recording mode setting means for setting various recording modes, a recording instruction means for instructing recording, and a radius of a rotating magnetic recording medium having a plurality of concentric tracks. a magnetic head transport means for holding a magnetic head movably in a direction and transporting the magnetic head in a predetermined direction; and a reproduction means for processing a video signal read from a magnetic recording medium by the magnetic head and outputting the processed video signal to the outside as a reproduced video signal. A switch for switching the connection between the processing means, the recording processing means for processing a video signal input from the outside to create a video signal for recording, and the magnetic head and the input end of the reproduction processing means or the output side of the recording processing means. and a control means for controlling the switching means and the magnetic head transporting means to perform a recording operation according to the setting mode based on the setting output of the recording mode setting means, and the recording mode setting means sets the recording review mode. is set and the recording instructing means is operated, the control means performs recording for a predetermined period of time in response to the operation of the recording instructing means, and at least during the period when the recording instructing means is operated from the point in time when recording ends. The present invention is characterized in that the switching means is controlled to perform a reproducing operation.

[Effect]

In the still image playback device according to the present invention, when the recording review mode in which recorded images are played back immediately after recording ends is set by the recording mode setting means and the recording instruction means is operated, the still image playback device responds to the operation of the recording instruction means. The control means controls the magnetic head and the input side of the playback processing means or the output side of the recording processing means so that recording is performed for a predetermined period of time, and the playback operation is performed at least during the period when the recording instruction means is operated from the time the recording ends. A switching means is controlled to switch the connection.

As a result, it becomes possible to arbitrarily set the playback time according to the operator's intention.

〔Example〕

FIG. 1 shows the appearance of a still image playback device capable of recording, particularly its front operation panel.

On the left side of the front operation panel 11 of the still image reproducing device 10, a packet 13 for storing a disk pack 20 and its cover 12 are rotatably supported at their lower ends. By pressing the ejection button (so-called eject button) 16, the closed cover 12 and packet 13 are mechanically opened as shown by the dashed line.

By pressing the cover 12, the cover 12 and packet 13 are closed and locked. Further to the left side of the cover 12, a 1-thickness 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 shack 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.

A plurality of (for example, 50) tracks (for example, track pitch 100 μm) are provided concentrically on the magnetic disk 21, and each track carries an FM signal for one image (one frame).
The fl color video signal (including luminance signal, chroma signal, etc.) can be magnetically recorded.

Figure 2 shows the relationship between the tracks provided on the magnetic disk 21 and the home position I (P) of the magnetic head. are Nα in order from the outer one
Tracks from 1 to 1lkL50 are marked with circles.

Home position HP is outside the Ki 1 track. This home position HP is not attached to the magnetic disk 21, but is an extreme position assigned on the moving path of the magnetic head. Home position HP c) Detected by home position switch 84 (see FIG. 4).

Referring again to FIG. 1, a half of the front operation panel 11 is provided with a display 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 on which the magnetic head 51 is currently positioned, various warnings (indicated by 17a), and the disk pack 20 contained in the packet 13. A message such as "pack present" (indicated by 17b) indicating that the packet 13 is closed is displayed.

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, and automatic advance time in playback mode. Key 18 for setting
etc. Indicator lights 45, 46, and 47 correspond to keys 41, 42, and 43, and when these keys are pressed, the corresponding indicator lights light up. The functions of these key switches will be described later.

The still image playback device is capable of playing back and recording 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 hept', 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 is based on manual input of standard color television video signals. This video signal is provided by, for example, a television camera or a 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, one field is recorded on the magnetic disk so that one frame (one image) is recorded. Video signals are often recorded. 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 continuous shooting. In the recording mode (more specifically, the recording standby mode to be described later), the magnetic head must be kept on standby in the unrecorded track of the magnetic disk. When 1 frame recording is selected, 1 frame (1 field)
A video signal for 10 minutes is recorded on that track, and immediately thereafter the magnetic head moves to the next (ie, inner) track and waits. In recording review mode, 1
After a frame worth of video signals is recorded on a track, the video signal recorded on that track is immediately 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 snapshot mode, the above-described one-frame recording operation is performed continuously (for example, about 6 to 8 times per second).

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

When the single-frame key 43, review key 42, or continuous shooting key 41 is pressed in stop mode, the corresponding indicator light 4
7. 46 or 45 will illuminate and the key pressed will be remembered and the device will go into recording standby mode. Next, when the record key 33 is pressed, if there is memory that the 1-frame key 43 was pressed, a 1-frame recording operation is performed, and a review/recording operation is performed.
If there is a memory that the key 42 was pressed, a recording review operation is performed. After these operations, the device returns to recording standby mode again. If the recording key 33 is pressed while there is a memory of pressing the quick copy key 41, the quick copy operation is performed while the recording key 33 is pressed, and when the recording key 33 stops being pressed, the mode returns to the recording standby mode.

In order to prevent type 2 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 corresponding indicators 45 to 47 are displayed. 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, use the forward key 32 or reverse key 3.
1 can be pressed to move the magnetic head to the inner or outer adjacent track. This is track feed mode. Each press of one of these keys 31, 32 advances the magnetic head one track 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.

To erase the signal of a recorded track, press the 1-frame key 43 and the erase key 44 from the stop mode. When the erasing process for that track is completed, it returns to recording standby mode.

When the stop key 34 is pressed from the recording standby mode, the magnetic head is moved outward (in the opposite direction) by one track and returns to the stop mode, except when erasing is performed. This is because in the three recording modes described above, the magnetic head is moved inward (in the 11th 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 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. When the automatic feed key 35 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 reproduced. Furthermore, when the track Nα display key 36 is pressed, a signal for displaying the track Nα on which the magnetic head is located is superimposed on the reproduced video signal and output. Track Nα is displayed. When the stop key 34 is pressed, the system returns to the stop mode.

In any of the above modes, the track NCL on which 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, and is then moved inward by a predetermined distance and positioned on the track Nα1.

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 should be positioned is always based on the home position HP.
determined by the distance from

In playback mode, after the position of the large hole 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 the envelope detection described later. Fine position control is performed.

FIG. 4 shows the electrical configuration of the still image reproduction device.

The overall operation of this still image reproduction device is supervised by a control device 50. This control device 50 includes a central processing unit, preferably a microprocessor (hereinafter referred to as CPU), a memory that stores its programs and necessary data, and interfaces with peripheral elements, circuits, devices, etc. It is configured.

Once the disk pack 20 is placed within the packet 13 and the packet 13 is closed, the magnetic disks 21 within 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 regulation 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 regulation 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 this groove, so as to sandwich the magnetic disk 21 between it and the magnetic head 51. . As described above, the magnetic hept 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. In addition, a magnetic material 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, and this leakage magnetic flux is detected to detect the leakage magnetic flux. Close to the core is a phase detector 52 which generates one phase detection pulse PC per rotation.

The phase detection pulse PC of the phase detector 52 is manually input to the servo control circuit 56 and the control device 50. Disc motor 5
A frequency generator 55 provided at the motor 4 outputs a signal with a frequency proportional to the rotational speed of the motor 54 and is applied to a servo control circuit 56.

Furthermore, this servo control circuit 56 has a vertical synchronization reference signal r.
ef V is powered by humans. Based on such an input signal, the servo control circuit 56 rotates the disk motor 54 at a constant speed, for example, 3.60 Or, pom, and also outputs a phase pulse PC as shown in FIG.
The rotational phase of the motor 54 is controlled so that the rotational phase of the motor 54 is 7H ahead of the rise of the reference signal refV (H is the period between two consecutive horizontal synchronization signals).

Further, the servo control circuit 56 starts and stops the motor 54 in accordance with commands from the control device 50.

The phase 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.

A standard format color video signal applied to the input terminal 60 from a television camera, television receiver, etc. is processed by the recording processing circuit 61 to convert its luminance signal component and chroma signal component into F.
The M-modulated signals are combined and sent to the amplifier circuit 63.
given to. This amplified FM modulation signal is applied to the magnetic hept 51 via a recording control switch 64 and a recording/reproduction changeover switch 65. On the other hand, horizontal and vertical synchronization signals of the input video signal are extracted by a synchronization separation circuit 61a and provided to a waveform shaping circuit 66. Waveform shaping round 116-6
is the human-powered vertical synchronization signal Vsyn as shown in FIG.
A reference signal r having a leading edge synchronized with the leading edge of c and having a duty ratio of approximately 1/2.
ef V is created and output. This reference signal ref V is applied to the servo control circuit 56 via the synchronization changeover switch 68 (this is called external synchronization). Therefore, recording of the vertical synchronization signal is started 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 phase pulse PG. The video signal will be recorded.

In the case of reproduction, a similar vertical synchronization reference signal ref V is applied from the 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 ref V and the phase pulse PC by the servo control circuit 56, the magnetic head 51 reads out a video signal whose vertical synchronization signal always starts 7H behind the PC. .

The phase pulse PC is given to the control device [50], and the video signal is synchronized with this pulse PG with a certain delay in both recording and reproduction.
This pulse PG is used for timing control in various processes.
It will be possible to do this based on the standard. 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 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 input modulated luminance signal and chroma signal, 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 to 20MHz for a certain period of time (about 1 second)
generates a signal whose frequency is continuously swept over a range of degrees.

The magnetic head 51 is supported movably in the radial direction of the magnetic disk 21 by a transfer control device 57, and is controlled to be moved in the same direction. The control device 50 gives instructions to the device 57 regarding the direction and amount of movement of the magnetic head 51. ! if[57 includes a step motor, and the magnetic head 51 is moved in proportion to the rotation angle of this step motor. For example, per one drive pulse of the step motor, the motor rotates approximately 15@, thereby moving the magnetic head 51 approximately 8.33 μm (1 pitch). Therefore, the magnetic head 51 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, for example, 256 quantization levels, 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 the reproducing and erasing motors).

If the level of the detected signal does not reach a predetermined threshold level when the magnetic head 51 is moved across a track, that track is unrecorded. When reproducing a video signal, after the magnetic head 51 is positioned using the above-mentioned absolute address method, the position where the detected 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 performed in the same way when erasing a video signal, and areas within a certain range on both sides of the peak position are subject to erasure.

Recording control switch 64, recording/playback switch 65,
The synchronization changeover switch 68 and the video output control switch 69 are shown as contact switches, but of course they are generally realized by non-contact switches made of semiconductor elements or the like. 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 66 side, and the switch 69 is turned on. That is, when the recording standby mode is entered, the changeover switches 65 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. 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,
During this time, the FM modulated video signal is sent to the magnetic head 51, and one field is recorded in one rotation of the magnetic disk 21. 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), recording is performed and then played back as described above. Therefore, when recording by the magnetic head 51 is completed,
In synchronization with the PG double signal, the switch 65 is switched to the reproduction geographical circuit 71 side, and the switch 69 is turned off. Therefore, the video signal read by the magnetic head 51 is output 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.

Also in erase mode switches 64, 65, 68 and 6
The state of 9 is the same as in the recording mode.

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

All operation mode switching and various operations are performed based on inputs from various switches and various keys.

The various switches include a load end switch 81 that detects when the packet 13 is closed to a position where the magnetic disk 21 therein will be securely attached to the spindle of the disk motor 54; packet 1
The pack switch 82 detects that the disc pack 20 is stored in the bucket 13, and the erroneous recording prevention claw 24 of the disc pack 20 stored in the bucket 13 has been removed and does not exist (that is, the disc pack 20 is not recorded). There are also an erroneous recording prevention switch 83 that detects (prohibited), the above-mentioned home position switch 84, etc. Various keys include the key groups 31 to 36 and 41 to 44 provided on the front operation panel 11 described above.
and 18. The control device 50 operates at a constant period (for example, 17
It performs a key scan routine every 60 seconds).
In this key scan routine, the control group 50 sends a key scan 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.

Further, the control device 50 also controls the display of the indicator lights 45 to 47 based on the above-mentioned key scan routine, and controls the display of the display 17 based on various operation routines.

Finally, the operation of the recording mode described above will be explained from the viewpoint of the geographical means of the CPU in the control device 50.

Before explaining, the main conditions for recording are:
The track on which the magnetic head 51 is located must be unrecorded (the envelope detection output must be below the threshold level), and the erroneous recording prevention claw 24 of the disk pack 20 must not be removed (there is no erroneous recording). (This can be determined by the output of the prevention switch 83), and the recording standby mode is set (one of the single-frame, review, or snapshot key switches 43, 42, and 41 is pressed). The former two conditions will not be particularly mentioned in the following explanation to avoid complexity.

FIG. 6 shows part of the key scan routine.

In order to make it easier to understand, this flow chart is expressed as if it were a process that would be performed when key human power was available.

Control device 50. Especially in that memory, one frame key 43
A flag that remembers that the FO% review key 42 was pressed A flag that remembers that the FI% continuous copying key 4 was pressed
Flag F to remember that 1 was pressed! , Recording key 3
A flag F4 for determining the start (rise) of the press of No. 3, and a flag Fs for storing that the recording key 33 is pressed are provided. It is assumed that the flag F is set (=1) in the initial processing.

When the 1-frame key 43 is pressed, the flag Fo is set, the other flags F1 and F are reset, and the indicator light 47 is lit (steps 101.102.10).
3.104). Corresponding processing is also performed when the review, -, key 42, or continuous shooting key 41 is pressed. (Steps 111-114.121-124).

When the recording key 33 is pressed, flag F is set.

On the condition that F is set (that is, it is the first rise), the flag Fs is set, and then the flag F is reset (=0) (steps 131 to 1).
34). Therefore, once the flag F is reset, in the next key scan routine, the record key 33
Even if it is determined that is pressed (YE in step 131)
S), "Is rF4=1?" in step 132 is determined to be No, so the flags Fs and F4 are kept as they are.

If it is determined in the key scan routine that the record key 33 is not pressed, the flag Fs is reset and the flag F is set (steps 135 and 136).
).

FIG. 7 shows the processing performed when any of the flags F0 to F2 is set. The process in Figure 7 and the process in Figure 8, which will be described later, are interrupt processes that check the states of the above-mentioned flags at regular intervals (for example, 10m5) and proceed to the corresponding process if any are set.

If any of the flags Fo, Fi, and Fa is set, a recording standby mode setting process, that is, a process of turning on the above-mentioned switch 69 and switching the changeover switches 65 and 68 to the recording side is performed.

At this time, the first two main conditions for recording described above are also checked. If these conditions are not met, a warning is displayed on the display 17.

FIG. 8 shows interrupt processing due to flag Fs being set.

First, it is checked whether either flag FOSF or SF2 is set (step 141).
). This corresponds to checking the third recording condition mentioned above. If none of these flags are set, a warning is displayed on the display 17 and the interrupt processing is terminated (step 142).

Flag F. When is set, single frame recording is performed. In this case, the system waits for the input of the phase pulse PC, and when this pulse PC is input (step 151), the recording control signal REC is set to H level and the switch 64 is turned on (step 152).

Then, when the next phase pulse PG is input, this signal R
The EC is set to L level and the switch 64 is turned off (steps 153 and 154). In this way, 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 second motor rotates to move the magnetic head 51 inward by one track, 100 μm (step 155). lastly,
The flag F is reset (step 156). Since flag F is reset, this one-frame recording process will not be performed unless the record key 33 is pressed again and flag F is set in step 133 in FIG.

Between steps 151 to 153 and step 155
During processing, interrupts for transition to other operating modes are prohibited.

When F,=1, recording review processing is performed. Since this process is the same in many respects as the one-frame recording process described above, the same steps are given the same reference numerals.

In this recording Levigny process, steps 151 to 1540
After one-frame recording is completed, playback processing is performed. As described above, this regeneration processing involves turning off the switch 69 for 1° and 5 seconds and switching only the selector switch 65 to the regeneration side. Thereafter, the magnetic head 51 is moved one track forward and the flag F1 is reset. The operating state of the control device 50 in this recording review mode is shown in Fig. IJ10.

When F2 is set, it is quick-shot recording, and this process also has many steps in common with single-frame recording. Since continuous recording is a process in which single-frame recording is performed continuously as long as the recording key 33 is pressed, there is no process for resetting the flag F in step 156 in the single-frame recording process. Instead, a routine is included that waits for a short period of time until the magnetic head 51 completely stops after moving the magnetic head 51 forward by one track (step 158). After this WAIT processing, the program returns, but if the record key 33 is still pressed and flag F is set, the interrupt routine is entered again, and one frame of recording is performed in the same way. be exposed.

In the above embodiment, playback is performed for a certain period of time (1.5 seconds) after recording ends, regardless of how long the recording key 33 is pressed in the recording review mode. may want to make the playback time longer or shorter than that. 9 and 11 show the contents of an embodiment in which the playback operation is continued while the recording key 33 is pressed. FIG. 9 shows the processing after step 153 when F=1, that is, the recording review mode is set, in addition to the interrupt processing shown in FIG.

Note that the same reference numerals are given to the same steps as those shown in the processing flow shown in FIG. 8. In FIG. 9, after one frame recording is completed (step 154), it is determined whether the recording key 33 is pressed (step 160). If the recording key 33 is not pressed, the magnetic head 51 will play one track after the recorded image has been played back for a certain period of time as in the case shown in FIG.
It is transferred in the forward direction and the flag Fs is reset (steps 157, 155, 156).

On the other hand, if the recording key 33 is pressed in step 160, the control device 50 outputs the recording/playback switching signal REC/FB to the switch 65, the switch 65 is switched to the playback processing circuit 71 side, and the playback operation is started. (step 161). While the recording key 33 is pressed from the start of the playback operation, the playback operation of the recorded image continues (step 162). Then, when the recording key 33 is turned off, the switch 65 is activated by the recording processing circuit 61 in response to the recording/playback switching signal REC/FB output from the control device 50.
When the playback operation is finished, the flag Fs is reset (steps 163 and 164).

The operating state of the control device 50 at this time is shown in FIG.

〔Effect of the invention〕

As explained above, in the present invention, when the recording review mode is set and the recording instruction means is operated, recording is performed for a predetermined period of time in response to the operation of the recording instruction means, and at least the recording instruction means is operated from the time when the recording ends. Since the playback operation is performed during the period of operation, according to the present invention, the playback time immediately after recording ends can be arbitrarily set by the operator in accordance with the content of the recorded image.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the appearance of the still image reproducing device, Fig. 2 is an explanatory diagram showing the relationship between track numbers on a magnetic disk and the home position, and Fig. 3 is an explanatory diagram showing the relationship between the track numbers on the magnetic disk and the home position. An explanatory diagram showing the state of operation mode transition in response to key input, Fig. 4 is a block diagram showing the electrical configuration of the still image reproduction device, and Fig. 5 is synchronization of the disk motor by the servo control circuit. Time charts showing control and recording timing, FIGS. 6 to 9 show an example of the procedure of recording processing by the CPU, FIG. 6 shows a 70-chart showing a key scan routine, FIG. 8th
9 and 9 are flowcharts showing interrupt processing, FIG. 10 is a timing chart showing an example of operation in recording repeat mode, and FIG. 11 is a timing chart showing another example of operation in recording review mode. . 10... Still image playback device, 21... Magnetic disk °, 33... Recording key, 41... Continuous shooting key,
42... Rehi +-143... 1 frame key, 50... Control device, 51... Magnetic head, 5
7... Head transfer drive control device, 60... Video signal input terminal, 61... Recording processing circuit, 65...
Recording/playback switching switch, 70... Playback video signal output terminal, 71... Playback processing circuit.

Claims (1)

[Claims] Recording mode setting means for setting various recording modes; recording instruction means for instructing recording; a magnetic head transporting means for holding a magnetic head and transporting the magnetic head in a predetermined direction; a reproduction processing means for processing a video signal read from a magnetic recording medium by the magnetic head and outputting it to the outside as a reproduced video signal; a recording processing means for processing a video signal input from the recording processing means to create a video signal for recording; a switching means for switching the connection between a magnetic head and the input side of the reproduction processing means or the output side of the recording processing means; and control means for controlling the switching means and the magnetic head transport means so as to perform a recording operation according to the setting mode based on the setting output of the mode setting means, and the recording review mode is set by the recording mode setting means and the recording operation is performed in accordance with the setting mode. When the instruction means is operated, the control means performs recording for a predetermined period of time in response to the operation of the recording instruction means, and performs a playback operation at least during the period in which the recording instruction means is operated from the time the recording ends. 1. A still image reproducing device characterized in that a switching means is controlled to