JPS6185670A - Rotary magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To minimize a kind of switches installed on a panel and to obtain multifunction by releasing a timer reproduction mode on conditions that a forward switch or a reverse one has been operated in the timer reproduction mode. CONSTITUTION:When the forward switch 5 and track number display switch 7 are all turned on, an AND gate 70 generates an output signal. When the reverse switch 6 and the track number display switch 7 are all turned on, an AND gate 72 generates the output signal. When the forward switch 5 or reverse switch 6 is turned on in the midst of reproducing a timer, an OR gate 74 produces a clear signal CLR. A counter part 76 executes addition and subtraction with outputs of the AND gates 70 and 72 and is reset by the signal CLR, whereby the timer reproduction is released.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rotating magnetic recording/reproducing apparatus, and more particularly to a rotating magnetic recording/reproducing apparatus for reproducing information recorded or edited on a rotating magnetic recording medium such as a magnetic disk. In particular, the present invention relates to a rotary magnetic recording and reproducing apparatus that reproduces information recorded on concentric tracks formed on a magnetic disk while applying tracking servo.

[Background of the invention]

Recently, imaging devices such as solid-state image sensors and image pickup tubes have been combined with recording devices that use magnetic disks, which are inexpensive and have a relatively large storage capacity, as recording media to take still photographs of subjects purely electronically and record them on rotating disks. However, electronic still camera systems have been developed in which images are reproduced using a separate television system or printer.

However, recording media used for such magnetic recording, especially magnetic disks, are prone to tracking defects due to anisotropy, eccentricity, thermal expansion, etc. There is a problem with scanning the l-rack and creating crosstalk.

In order to avoid this problem, there is a method of applying tracking servo when recording information to record a trunking signal, and applying tracking servo using this tracking signal during reproduction. However, it is not practical to provide a tracking servo mechanism that requires precise control to a small, lightweight recording device such as a camera.

Therefore, one method is to adopt the guard hand method or FM azimuth method as the recording method, and to prevent some tracking failure during playback, to prevent the playback head from scanning the adjacent trunk, or to prevent the signal of the adjacent track even if it scans. There is a way to compensate by not picking it up.

Along with this, a so-called mountain climbing method is also used. During recording, the recording head is moved at a predetermined track pitch using a stamping motor without applying a tracking servo, and during playback, the envelope of the output signal of each track is detected and the optimal track is identified from the peak position. The tracking servo is applied by

In rotating magnetic recording used in electronic still camera systems, for example, the track pitch is about 100 μm on a small diameter C disk of about 50 mm, that is, the track width is about 50 to 60 μm, and the guard band width is about 50 to 60 μm.
Fifty tracks are recorded at approximately 40 μm. In a recording or reproducing device, this magnetic disk is
It rotates at a constant speed of 0.00 rpm, and video signals are recorded or reproduced at field or frame rate.

Such thin and small-diameter compact magnetic disks are usually handled while being housed in a molded package (hereinafter referred to as a disk pack) made of plastic or the like. That is, the entire disk bank is loaded into the loading position of a recording or reproducing device, and recording or reproducing is performed by rotating the magnetic disk while it is housed in the disk bag.

Incidentally, such a rotary magnetic recording/reproducing apparatus may be provided with a timer reproduction mode in which reproduction of each track on a magnetic disk by a magnetic head is executed at set time intervals. In such a case, when switching from non-timer playback mode to timer playback mode, or when switching from timer playback mode to non-timer playback mode, if dedicated switches are provided for each, there is a problem that the number of switches increases. [Object of the Invention] This invention The invention has been made in view of the above circumstances, and an object of the invention is to provide a rotary magnetic recording/reproducing device that can be multifunctional while minimizing the number of switches provided on the panel surface.

[Summary of the invention]

According to the present invention, in order to achieve the above object, in a rotating magnetic recording/reproducing device that performs recording or reproduction by moving a magnetic head in the radial direction of a rotating magnetic disk, each A timer playback means for automatically playing tracks sequentially at set times, a forward switch for forwarding the magnetic head, a reverse switch for forwarding the magnetic head and the throat backwards, and a forward switch or The present invention is characterized by providing means for canceling the timer playback mode on the condition that the reverse switch is operated during the timer playback mode.

[Embodiments of the invention]

Next, a preferred embodiment of the rotary magnetic recording/reproducing apparatus according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows an external configuration diagram of a rotating magnetic recording/reproducing apparatus 100 according to the present invention. In Fig. 1, l is a housing, 2 is a power switch, 4 is an eject switch, 5 is a forward switch for forwarding the magnetic head, 6 is a reverse switch for reversing the magnetic head, 7 is a magnetic head, This is a track number display switch to show which trunk the node is located on the magnetic disk. Further, 8 is a warning light consisting of an LED or the like, 9 is an external remote control connector, and 102 is a bag throat that is opened by the eject switch 4.

FIG. 2 shows the circuit configuration of the apparatus of this embodiment shown in FIG. 1, in which a rotating recording medium 10 such as a magnetic disk is removably mounted on a spindle 1 driven by a DC motor 12. In FIG. In this embodiment, the magnetic disk 10 has a magnetic recording material sort with a diameter of about 50 mm, and a plurality of recording tracks, for example 50, are recorded on the recording surface 16 concentrically at a pitch of about 100 μm, for example. In this embodiment, the signal recorded on the recording track is a video signal, which may be, for example, a color video signal in which a luminance signal and a chroma signal are FM-modulated. In this video signal, for example, field video No. 2 forming one field of an image is recorded onto one track by rask scanning.

The DC motor 12 has a frequency generator 18 that generates an AC frequency signal, is supplied with power by a servo circuit 2o, and rotates the disk 10 at a predetermined rotational speed, e.g.
Rotation/rotation chamber is servo controlled to rotate at speed. The servo circuit 2o is connected to a control device 60 that controls the entire device, and controls rotational driving and stopping of the disk 10 in response to a signal DISK.

A phase generator 22 is disposed at a predetermined position near the recording surface 16 of the disk 10, and is connected to the servo circuit 20 and the control device 6o via an amplifier 24. As a result, a timing mark formed corresponding to a predetermined position on the recording surface 16 is detected, and a timing pulse PG is detected.
is formed.

A magnetic transducer or head 26 is disposed above the recording surface 16 and is carried by a support mechanism 28 . This support mechanism is driven by a step motor (PM) 30 as conceptually indicated by a dotted line 28, and moves the head 2G in both radial directions along the recording surface 16 as indicated by an arrow R. It is configured such that any track on 16 can be selected.

The magnetic head 26 may have a magnetic recording function, but in this embodiment, it has a reproduction function of detecting a video signal from a track already recorded on the recording surface 16 and converting it into a corresponding electric signal. Things are exemplified. As mentioned above, in this embodiment, the disk 10 rotates at 3600 revolutions/rotating chamber speed, so one track's worth of video signal, that is, one field of FM modulated video signal, is transmitted from the magnetic node 26 every 1/60 second of one revolution. It will be played. By demodulating this, it becomes compatible with standard color television systems such as the NTSC system.

(The reproduction output 32 of the head 26 is connected to a video signal processing circuit 36 and an envelope detection circuit 38 through a preamplifier 34. The video signal processing circuit 36 processes the video signal detected by the head 26. , for example NT
This is a circuit that outputs the SC Fortmant composite color video signal to the device output 40. This is demodulated and NTS
The vertical synchronization signal VSYNC is extracted from the C format composite color video signal and the ailJ? It has a function of supplying this to the In device 60. Further, upon receiving the signal MUTE from the control 1 device 60, the effective horizontal scanning period of the video signal is set as a blank signal, and a muting operation is performed. Note that the function of converting to such a standard format is not essential to the vehicle. It may also have the form of output to the terminal 40.

The envelope detection circuit 38 is a detection circuit that detects the envelope of the FM modulated video signal recorded on the track of the recording surface 16 and outputs a voltage corresponding to the envelope to the output 42. This is connected via an envelope amplifier 44 to an analog-to-digital converter (Δl')C) 45. The ADC 46 has 256 quantization levels in this embodiment, and outputs this as 8-bit data to the control device 60 in response to a request from the control device 60.

The control device 60 is a control device that centralizes control of the entire device according to operations by an operator, as will be described in detail later, and is advantageously configured by, for example, a microprocessor system.

In this embodiment, as described above, the power switch 2 and the forward key FWD5 are used to move the head 26 in the forward direction of the track number (for example, from the outer track to the inner track).
, and a reverse key REV6 for moving the head 26 in the opposite direction, which are connected to the control 1 device 60. Key FWD5. ．． The track number 49 on which the magnetic head sent by REV6 is located is visually displayed on a display device 48 such as a CRT display by a superimpose device or the like equipped with an oscillator (not shown) connected to the control device 6o. Trunk No. 49 may be displayed not on the display device 48 but on a display device independent from the display device 48.

In this embodiment, the step motor 30 is a four-phase drive pulse operation motor, and responds to one drive pulse by approximately 15"
It rotates. Therefore, it makes one rotation with 24 pulses. The head support mechanism 28 moves the head 26 in the direction of arrow R by about 4.2 mm using an I pulse supplied to the step motor 3o.
It is configured to transfer μm. The excitation time for one pulse is, for example, about 2 to 3 milliseconds. therefore,
The head 26 is moved approximately 100 μm in 24 pulses.

This drive pulse is supplied from a drive circuit 50 consisting of a current amplifier, and the latter generates an excitation coil drive pulse for the step motor 30 according to an excitation pattern instructed by the control device 6o.

Control +6? The station 60 and the servo circuit 20 are connected to a reference generator (O
3C) [Respond to the reference clock generated by i2. ,1
In this embodiment, the servo circuit 20 is supplied with a reference signal of 60 Hz, which is the same as the field 1 frequency of the rask scanning video signal recorded on the magnetic disk 10, and the control device 60 is supplied with a high-speed clock, for example, 3.58 MHz. Supplied.

FIG. 3 shows a magnetic disk pack 200 used in this embodiment, and this disk bank 200 has a housing 222 that rotatably accommodates a thin, small-diameter magnetic disk 10 for image signals. has. A circular opening 226 is provided approximately in the center thereof, and the hub or core at the center of the magnetic disk 10 can be exposed through the circular opening 226. A magnetic material 214 that excites the coil 22 of the phase generator is formed in a part of the core 212 .

When the disk pack 200 is attached to the magnetic recording/reproducing apparatus 100, the tip of the spindle 14 is chucked to the core 212, allowing the n-air disk 10 to rotate within the disk bank 200.

The disk bank 200 is provided with a shutter 230 that is movable in a direction parallel to one side of the disk pack 200, as shown by an arrow 228.

When the shutter 230 is moved to a position opposite to that shown in the figure, the opening of the casing 222 underneath is exposed, and the regulating plate 64 and the magnetic head 26 of the playback device 100 are brought close to or in contact with the magnetic disk 10. be able to.

As shown in FIG. 4A, the disk bank 200 containing the disks 10 is inserted into the bucket 102 for loading into the Wi 100. Bucket 102
The disc pack 200 is removably housed and held, and is rotatably supported by the casing 1 of the apparatus 100 about the intersection 104 . Normally biased in a direction opposite to arrow A by biasing means 106, disk pack 200 can be removed from bucket 102 at the position shown in FIG. 4A.

When the disk bank 200 is inserted and the bucket saw l-102 is pushed in the direction of the arrow, the retaining member 108 moves in response to this and moves in the direction of the arrow C about the fulcrum 110, as shown in FIG. 4B. It slides on one side 116 of the arm 112, which is rotated under pressure, in the direction of arrow BQ, and moves to the position indicated by the dotted line 108a.

When you release your hand from the bucket 102, the biasing means 106
102 is set at the normal loading position by the biasing pressure of
It is housed in 14 and is compatible with this. At this time, the spindle 14 correctly chucks the core 212 of the disk 10.

In this state, the pressing portion 118 at the other end of the arm 112 presses the projection 128 of the normally open contact 120 to close it. In other words, the contact point 120 is
It is configured so that it is opened only when it is properly loaded. The output terminal 130 of the contact 120 is connected to the control device 60 as shown in FIG. °ε and the control device 60
This makes it possible to detect whether the disk pack 200 has been loaded normally. Like this 1 concubine point 1
20 constitutes a rotor switch shown in FIG.

Furthermore, an opening 122 is provided at the bottom of the bucket 102 as shown by the dotted line. Therefore, when the bucket 102 comes to the normal loading position, the protrusion 1 of the normally open contact 124
26 enters the opening 122 and the disc back 200
, which is pressed and closes the contact 124. The disk back 200 is inside the brush saw l-102.
If the contact 12 is not inserted in the "E" order, the contact 12 will not close.The output terminal 132 of the contact 124 is connected to the control device 60 as shown in FIG.
'[The B device 60 can detect the presence or absence of the disc back 200. Contact 124 thus constitutes the back switch shown in FIG.

In this embodiment, each trunk of the magnetic disk 1G has a fifth trunk.
As shown in the figure, the magnetic heads 26 are arranged from the smallest number to the oldest number from the outside toward the center, and the original return position HP of the magnetic head 26 is set to be further outside than the outermost track No. 1. There is. Jπ1 length of track or tracking mll? 111 is this base i1! Is it an i position person? −
This is done by making the head (many sides) and counting the number of tracks, that is, the number of envelope peaks, based on the 1 position HP that is restored from 1 to 1.

Mountain':'I-racking using the L-region i1[1 is performed as follows. First, assume that there are 1 rack of J, l, + in 26 scraps of magnetic heads. When keys FWD5 or R12V I;, E are operated, the control device 60 starts the step motor 30 by the drive circuit 50,
C. Transfer the air head 26 in the forward or reverse direction.

In this embodiment, the magnetic head 26 first performs an inter-track beam.
It is transferred in the forward or reverse direction over a distance slightly shorter than 100 .mu.m, for example, about 96 .mu.m for 23 pulses. At that time, it was read by the magnetic head 26 (I number is
The envelope is detected by the detection circuit 38, and the ADC 46
is input to the control device 60 in the form of digital data. Therefore, the control unit 60 further moves the head 26 by one pulse, and compares the level of the envelope of the signal detected from the magnetic head 26 at this time with the level of the I cope in the previous encoder.

In this way, the control device 60 detects and compares the envelope level each time the head 26 (multiple feeds) and determines the position where the envelope peak is. This is the on-trunk position.In this way, the control device 60 performs mountain climbing tracking.

In order to quickly on-track to the proper trunk position in such hill-climbing tracking, it is desirable to return the magnetic head 26 to the original return position HP at least before the start of tracking.

6Δ to 6E are flowcharts showing control associated with switch operations of each part in the present invention. (Nadai,
The numbers in parentheses are the step numbers or processing rules 1-
). First, when the power switch 2 turns 4" to 1L, it is reset (300), and the memory contents stored up to now are cleared by RAM clear (102). Next, the 6 switches are cleared by key scan (3f) l+). ,
That is, bank switch (Pack SW) l 24, home position switch (Il+', SW) 125
, Load switch (Load 5W) 120, Forward switch (Fwd SW) 5, Rehabilitation switch (Rcv SW) 6, Transmission switch (T)
r No, 5ln) 7 is scanned with a 1v pulse.

In other words, this lv pulse is flow 3 with a period of l/60 seconds.
The routine from 06 to flow 309 is scanned and 1/
The on/off status of the six keys is determined every 60.12 seconds.

Next, a warning process when the forward button 5 or the reverse button 6 is pressed without attaching the first disk pack 200 to the main body of the apparatus will be explained. First, when it is determined in step 308 that the back switch 124 is off (310) by the key scan starting at step 304, it is determined in step 312 whether the home position switch 125 is on. If the home position position/notch 125 is in the OFF state, the head 26 has not yet returned to the starting position (IIP position), so the head 26 is sent backwards toward the home position switch by the head reverse feed (314). be done. When the head 26 reaches the home position, the judgment obtained by the key scan in step 312 is that the home position switch 125 is in the on state (316).
Then, in step 318, it is determined whether the bucket is closed in the normal position, that is, whether the load switch 120 is turned on. Load switch 120
is not turned on, the disk motor 12 is stopped (320) as shown in FIG. 6B, and the flow returns to the original routine. Next, when the bucket 102 is closed to the normal position, that is, when the Rohto Suino F-120 is turned on (
322), it is determined in step 32.1 whether the forward switch 5 or the reverse switch 6 is turned on. When it is determined that the forward switch 5 and reverse switch 6 are in the off state (326), the disc motor 12 is stopped (320), and the flow is returned to the original routine. Next, if it is determined in step 32.1 that the forward switch 5 or reverse switch 6 is in the on state (328), the rotating CPt recording/reproducing device issues a warning (330). The logical state of each switch in the flow 328 is as follows. L
Possible modes include emitting the ED warning light 8, flashing the screen, flashing the number display, or emitting a warning sound. Or bucket 1
02 may be opened to notify the unloaded state. During this warning process (330), the disk motor 12 is in a stopped state (320). As explained above, Disk Pack 2
If the forward switch 5 or the reverse switch 6 is pressed while 00 is not inserted into the bank 102, a warning is issued, so the magnetic head 26 will not be moved while the bank is not inserted.

Next, in the rotating C-type recording and reproducing apparatus according to the present invention, if the magnetic head 26 is located at the same rank 1 to 1 on the magnetic disk for 18 consecutive minutes, a warning is issued, and the magnetic disk 10 is automatically stopped or the magnetic head is stopped. 26 is evacuated outside the recording area. This warning process will be explained. First, in step 332 of FIG. 6A, the CLL head 26 is
If it is determined that the same track has been continuously played for more than 18 minutes by checking whether the 18-minute timer has reached 0 (334), the forwards in 15 or reverse switch 6 is turned on in step 336. It is determined whether the temperature is ℃ or not. In step 336, forward switch 5 or reverse switch y-6
If it is determined that is in the off state (338>, the same warning process 330 as described above is not performed)1. Ru. Further, when the operator learns of the abnormal state from the warning process 330 and turns on the forward switch 5 or the reverse switch 6 (340), the 18-minute timer is set and the flow resumes the original routine. As described above, according to the rotary magnetic recording/reproducing apparatus according to the present invention, if a magnetic head is located in the same trunk for more than 18 minutes, a warning is issued to notify the abnormal state and the magnetic disk is automatically stopped.
Alternatively, since the magnetic head is retracted outside the recording area, the tracks of the magnetic disk will not be damaged.

Next, in Step 344 of Figure i13,
If it is determined that 102 is not closed in the normal position (3
46), the disc motor 12 remains in a stopped state (
320).

Further, if it is determined in step 334 that the bucket 102 is closed in the normal position (348), the disk motor 12 rotates (350).

Next, the rotating magnetic recording/reproducing apparatus according to the present invention performs the following initial operation. That is, if it is determined in step 352 that the initial operation is to be performed, that is, if the flag is zero (354), it is determined in step 356 whether or not the home position switch is in the on state. . If it is determined in step 356 that the home position switch is off (358), the air head 26 is reversed (360) and moves toward the home position switch 125. Eventually, the magnetic head 26 is located at the home position position, and the process proceeds to step 356. If it is determined that the home position 125 force is in the on state (362), a step of performing initial tracking operation (or unrecorded pack detection) processing. The process moves to step 364. In step 364, where an initial tracking operation is performed, the first trunk is found by the above-mentioned mountain climbing 1-racking operation, and when this initial tracking operation is completed, a flag IN indicating the state that the middle rise processing has been completed is set.
Set T to 1 (366). The flow in which the flag INT is set to 1 is returned to the original routine, and in step 352, the process goes directly to step 370 in FIG. 6C, so that the initial operation routine is not scanned in the next key scan. Further, in the rotary magnetic recording/reproducing apparatus according to the present invention, an operation for detecting an unrecorded bank is also performed in step 364 in which the initial tracking scan is performed. That is, if the user of the rotary magnetic recording/reproducing device accidentally inserts an unrecorded bank, the magnetic head 26 searches all the trunks and issues a warning if it determines that there is no recording track, that is, if it determines that there is an unrecorded puncture. is emitted to notify the user that there is an unrecorded puncture.

Next, the timer playback settings for images will be explained. The basic image timer playback time is set to 8 seconds,
This timer repeat setting can be made by pressing the forward switch 5 a predetermined number of times with the display switch 7 turned on, reducing the timer playback time every 1 second, and then pressing the display switch 7
While the reverse switch 6 is in the on state and the reverse switch 6 is pressed a predetermined number of times, the playback time of the still image can be increased by one second. That is, if it is determined in step 370 that the display switch is turned on (372), then in step 374 it is determined whether the forward switch 5 is turned on. If it is determined that the forward switch 5 is turned on (376), the forward switch is turned on in step 378.

Is Chi 5 newly turned on or has it been pressed continuously? It is determined whether it is a beech. If it is determined that the forward switch 5 is in the pressed state (380), the flow returns to the original routine.

If it is determined in step 378 that the forward switch 5 has been newly turned on (382), then in step 384 it is determined whether the timer counter is 1, that is, whether or not reproduction is being performed for 1 second. If it is determined that the timer counter is 1 (386), in this case, the forward switch 5 will be set to the minimum playback time of 1 second (= even if pressed once), and the flow will return to the original The routine returns.Next, if it is determined that the timer counter is not 1 (388), 1 second is subtracted from the timer counter.In other words, if the forward switch 5 is pressed anew when the playback time is 5 seconds, for example, Since 1 is subtracted from the timer counter (390), one timer time becomes 4 seconds of playback time.In this way, each time the forward switch 5 is pressed while the display switch 7 is in the on state, the timer counter is decremented by 1 second. When the playback time reaches 1 second (386), the set playback time is changed back to 1 second as described above.

Next, without pressing the forward switch 5 while the display switch 7 remains on (392), the reverse switch 6 is turned on in step 394 (396), and in step 398 it is determined whether the reverse switch 6 has been newly turned on. It is determined whether the button is held down. If it is determined that the reverse switch 6 remains pressed (400), the flow returns to the original routine. Next, in step 398, if it is determined that the reverse switch f edge 6 is newly turned on, the process proceeds to step 402.
4, it is determined whether the timer counter is 9, that is, whether it is an infinite standstill time. If it is determined in step 404 that it is an infinite stationary time (406)
No matter how many times the reverse switch 6 is pressed, the infinite pause time will not change and the key scan will continue to scan the original routine. Next, if it is determined in step 404 that the timer counter is 8 or less, then in step 410 a process of incrementing the timer counter by 1 second is executed. That is, for example, if the timer counter 5 sets the playback time to 5 seconds, one second is added by pressing the reverse switch 6 once, and the playback time becomes 6 seconds. Further, when the reverse switch 6 is pressed repeatedly and the timer counter reaches 9, the playback time becomes infinite. As explained above, according to this rotary ffi recording and reproducing device, the playback time is limited to 1 second each time the forward switch 5 is pressed in the ON state of -12, S, I, and CHI. 1; 1, and by pressing the reverse switch 6 a predetermined number of times with the display switch 7 on.
The opening time can be increased by seconds when Ji is live.

Next, a method of erasing the number display 49 on the screen will be explained. This deletion method is done by turning on the display switch/cheer while displaying the number display=+94;! Be erased. That is, in step 412 of FIG. 6C, it is determined that the display switch 7 is newly turned on (414),
If it is determined in step 416 that the ON operation was made while the track number was being displayed (418), the number display is erased and the non-display mode is set (420). Next, when it is determined that the switch 7 will be turned on again while the display is not displayed (422), a 2 second timer is set (424), and the switch is turned on β;
The trunk number will be displayed for only 2 seconds after 1 digit (4
26) The display mode is set (428). Further, if it is determined that the display switch 7 has not been newly turned on and is determined to be in a continuously pressed state (430), if the display switch 7 is not in the non-display mode in step 431 (4:32)
, a two-second timer is set (424), the track number is displayed (426), and the display mode is set (428).

Next, a method for canceling timer playback using the rotary magnetic recording/playback device according to the present invention will be described. Timer regeneration is canceled each time the forward switch 5 or reverse switch is turned on during timer regeneration. That is, if timer playback is in progress in step 434 of FIG. 6D (436), it is determined in step 438 whether the forward switch 5 or the reverse switch 6 is turned on, and the forward switch 5 or the reverse switch 6 is turned on. If it is not turned on (440),
In step 442 it is determined whether the timer is zero.

If the timer is zero, a predetermined timer playback time is set again (1I46), and a tracking operation is performed for the next trunk (i18). If it is determined in step 438 that the forward switch 5 or 7 or reverse switch 6 is turned on (a), then in step 160 it is determined whether the forward switch 5 or reverse switch 6 has been newly turned on. be judged. In step 460, if the on state of the forward switch 6 is not newly turned on (462), the forward switch 5 line is locked, and if the on state is not newly turned on (462), the normal routine is resumed, and if it is newly turned on (464), the timer Playback is canceled (46G). That is, the timer counter is 9.
, and the timer is cleared as soon as it is stopped (468). As a result, the reproduced image is displayed on the display device 49 in an infinite reproduction time state. According to the rotating magnetic recording and reproducing device according to the present invention,
By turning on the forward switch 5 or the reverse switch 6 during the timer regeneration, the timer regeneration can be canceled.

Figure '' shows a circuit configuration for carrying out the above-described playback time setting process. AND gate 70 connects forward switch 5 and track number.

Since an output signal is generated when both display switches 7 are on, this corresponds to the process of performing steps 370 and 374 in FIG. 6C and proceeding to step 398.

AND gate 72 generates an output signal when reverse switch 6 and track number display switch 7 are both on? This corresponds to the process for performing steps 370 and 394 and then moving to step 378. Further, the OR gate 74 has a function of calculating the logical sum of the forward switch 5 and the reverse switch 6 and generating a CLR (clear) signal for clearing the counting process.

The counter unit 76 performs each of steps 380, 390, 404, and 410, and immediately adds the timer counter and N
At the same time, the CL output from the OR gate 74
It has a function of resetting the counter value (in this embodiment, the timer counter value is set to 9 by resetting) by the R signal.

Next, the search mode of the rotary magnetic recording/reproducing apparatus according to the present invention will be explained. First, in step 170 of FIG. 6E, it is determined that the forward switch 5 or the reverse switch 6 is turned on (<472).
, Next, in step 474, it is determined whether tracking is in progress. If tracking is in progress, the process returns to the original routine (476), and if tracking is not in progress, track number display 49 is erased (478). Next, in step 480, it is determined whether the forward switch 5 or the reverse switch 6 is newly turned on, and if it is newly turned on (482), an l-luffing operation is performed in step (484), and a one second timer is used. It will be reset and return to the original routine. In step 480, forward switch 5 or reverse switch 6
If is held down (488), it is determined in step 490 whether the one second timer is zero. If the 1 second timer is not zero (492), the original routine is returned. Also, when it is determined that the 1 second timer is zero, that is, the forward switch 5 or reverse switch 6 has been pressed for more than 1 second, the 1 second timer stops in the time counter, and at the same time the 1 hour timer is cleared (494), and then the tracking It is scanned (496).

After tracking operation is completed, set track number 49 to 2V.
It is displayed for a period of 1/30 seconds. (498). In this way, according to the embodiment, by continuing to press the forward switch 5 or the reverse switch 5, the screen can be sequentially advanced frame by frame at high speed, and the 2V period (1/2V) that can be judged by the human eye. 30 seconds) only track number 49
You can search for the screen you need.

The time counter processing step 500 used in the routine includes a 1 second timer, a 2 second timer, an 18 minute timer, and a time setting timer (TIMER).

〔Effect of the invention〕

As explained above, according to the rotary magnetic recording and reproducing apparatus according to the present invention, the timer reproduction mode is canceled based on the operation of any of the slots provided on the panel surface. There is no need to provide a dedicated switch for canceling the timer playback mode, and the number of switches provided on the panel surface can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an external configuration diagram of a rotating magnetic recording/reproducing apparatus according to the present invention, FIG. 2 is a block diagram showing the circuit configuration of the rotating magnetic recording/reproducing apparatus according to the present invention, and FIG. 3 is similar to FIG. FIG. 4 is a perspective view showing an example of a magnetic disk back that can be used in the device shown in FIG.
Figures A and 4B are explanatory diagrams showing the Dino and Kubanok loading sections of this device, Figure 5 is an explanatory diagram showing the track arrangement on a magnetic disk that can be used with this device, and Figures 6A to 6E are Flow 1 and 7 showing an example of the operation flow of the control device shown in FIG. 2 are logic circuit diagrams for canceling the timer regeneration mode.

Claims (1)

[Claims] In a rotating magnetic recording/reproducing device that performs recording or reproduction by moving a magnetic head in the radial direction of a rotating magnetic disk,
A timer playback means that automatically reproduces each track on the magnetic disk by the magnetic head at set time intervals, a forward switch for forwarding the magnetic head, and a reverse switch for forwarding the magnetic head backwards. and,
1. A rotary magnetic recording and reproducing apparatus, comprising means for canceling the timer reproducing mode on the condition that a forward switch or a reverse switch is operated during the timer reproducing mode.