JPS6251080A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To automatically project by moving a magnetic head to the first track when an operating signal for an automatic feeding is outputted and an alarm signal is outputted. CONSTITUTION:An alarm signal (LED signal) is inputted to an input terminal of an AND gate 914 through an input circuit 902, a pulse signal is outputted to a base of a transistor 954 through a resistance 952 from a monstable multivibrator 930, a transistor 954 is conductive and a line H3 is short circuited with a line A2. As a result, a state equivalent to a state that a pack switch 124 is changed to an off state (non-operative state) is obtained. A controller 60 judges that the pack switch 124 changes from an on state to the off-state and moves a magnetic head 26 from a final track to an original return position HP. When the magnetic head 26 reaches to the original return position HP, a home position switch 125 operates, the controller 60 moves the magnetic head 26 to the first track to start a reproducing operation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic recording and reproducing apparatus, and particularly to a magnetic recording and reproducing apparatus that reproduces information recorded on a magnetic recording medium such as a magnetic disk. In particular, the present invention relates to a 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 tubes have been combined with recording devices that use magnetic disks, which are inexpensive and have a relatively large storage capacity, to take purely electronic still photographs of subjects and record them on rotating disks. Electronic still camera systems have been developed that record and reproduce images using a separate television system or printer.

By the way, when reproducing images recorded on a magnetic disk using such a magnetic recording/reproducing device, the magnetic head moves to the last track of the magnetic disk, and after reproducing the last recorded image, it automatically moves to the first track ( If it is possible to return to the first track (hereinafter referred to as the first track), automatic projection will be possible and convenient.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording and reproducing apparatus that is capable of automatic projection by automatically returning the magnetic head to the first track when the magnetic head moves to the last track of the magnetic disk.

[Summary of the invention]

In order to achieve the above object, the present invention provides a magnetic recording/reproducing device that performs recording or reproducing by moving a magnetic head in the radial direction of a magnetic disk, in which the device is in an operating state other than a normal recording or reproducing state. a warning means for outputting a warning signal when the magnetic head is moved; an operating means for outputting a scratching signal for automatically moving the magnetic head in the forward direction; and a storage means for storing the output state of the operating means; reset means for logically multiplying the warning signal of the warning means and the output signal of the storage means and outputting a reset signal based on the logical product; Is it possible to move it to the first track? 21 means.

[Embodiments of the invention]

Next, preferred embodiments of the 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 magnetic recording/reproducing apparatus 100 according to the present invention. In Figure 1, l is the housing, 2 is the power switch, 4 is the eject switch, 5 is the forward switch that forwards the magnetic head, 6 is the reverse switch that moves the magnetic head backwards, and 7 is the magnetic head. This is a trunk number display switch to indicate which track on the disk the trunk is located on. Further, 8 is a warning light consisting of an LED or the like, 9 is a remote control connector to be described later, and 102 is a banquet 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 magnetic recording medium 10 such as a magnetic disk is removably mounted on a spindle 14 driven by a DC motor 12. In this embodiment, the magnetic disk 10 has a sheet of magnetic recording material with a diameter of approximately 50 cm, and its recording surface 1
6, a plurality of, for example, 50 recording tracks are recorded concentrically at a pitch of, for example, about 100 μm. 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. For example, a field video signal forming one field of an image is recorded onto one track by rask scanning.

The DC motor 12 includes a frequency generator 18 that generates an AC frequency signal, and is supplied with power by a servo circuit 20 so that the disk 10 is rotated at a predetermined rotational speed, e.g.
It is servo controlled to rotate at rotation/rotation window speed. The servo circuit 20 is connected to a control device 60 that controls the entire apparatus, and controls rotational driving and stopping of the disk 10 in response to a signal DISM.

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 60 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 shown by a dotted line 28, and moves the head 26 in both radial directions along the recording surface 16, as shown by 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/rotation window speed, so one trunk's worth of video signal, that is, one field of FM modulated video signal, is transmitted from the magnetic herad 26 every 1/60 second of one revolution. It will be played. By being demodulated, this becomes compatible with standard color television systems such as NTSC.

The reproduction output 32 of the magnetic head 26 is transmitted through a preamplifier 34 to a video signal processing circuit 36 and an envelope detection circuit 38.
It is connected to the. The video signal processing circuit 36
The video signal detected in step 6 is processed, for example, NTSC.
The device outputs as a composite color video signal in the format 40
This is a circuit that outputs to. This is demodulated and converted from the NTSC format composite color video signal to the vertical synchronization signal VSY.
It has a function of extracting NC and supplying it to the control device 60. Furthermore, upon receiving the signal MUTE from the control 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 this device, and the processing circuit 36 may have a function of extracting a synchronization signal from the video signal detected by the head 26 and a function of simply outputting this to the terminal 40 under the control of the control device 60.

The envelope detection circuit 38 detects the envelope of the FM modulated video signal recorded on the track of the recording surface 16.
This is a detection circuit that detects the voltage and outputs a corresponding voltage to the output 42. This is connected via an envelope amplifier 44 to an analog-to-digital converter (ADC) 46. 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, the forward switch 5 that moves the head 26 in the forward direction of the track number (for example, from the outer track to the inner track), and the forward switch 5 that moves the head 26 in the opposite direction. The reverse switch 6 is connected to a control device 60. Forward switch 5, reverse switch 6
Track number 4 where the letter magnetic head 26 is located
9 is visibly displayed on the display device 48 such as a CRT display by a superimposing device or the like having an oscillator (not shown) connected to the control device 60. Track 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 degrees.
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 seconds with one pulse supplied to the step motor 30.
It is configured to transfer μm. (2) The excitation time for the 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.

The control device 60 and the servo circuit 20 are connected to a reference generator (O3C
) 62 generates a reference clock. In this embodiment, the servo circuit 20 has a frequency of 60 H, which is the same as the field frequency of the rask scan video signal recorded on the magnetic disk 10.
The control device 60 is also supplied with a high-speed clock, for example, 3.58 MHz.

FIG. 3 shows a magnetic disk pack 200 used in this embodiment, and this disk pack 200 has a housing 222 that rotatably accommodates a thin, small-diameter magnetic disk 10 for image signals. exists. 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 body 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 device 100, the tip of the spindle 14 chucks the magnetic disk 10 into the disk pack 2.
It can be rotated within 00.

The disk pack 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, a disk puncture 200 containing a disk 10 is inserted into its packet 102 for loading into the apparatus 100. Packet 102
The disc pack 200 is removably housed and held, and is rotatably supported by the housing 1 of the device 100 about an intersection 104. Normally, the disc pack 200 is moved in the opposite direction to the arrow A by a biasing means 106. The disk pack 200 can be removed from the packet 102 at the position shown in FIG. 4A.

When the disk pack 200 is inserted and the packet 102 is pushed in the direction of the arrow A, the engagement member 108 is interlocked in response to this and biased in the direction of the arrow C about the fulcrum 110, as shown in FIG. 4B. One side 1 of the arm 112 that rotates
16 in the direction of arrow B, and moves to the position indicated by dotted line 108a.

Then, when you let go of the bucket) 102, the biasing means 106
The packet 102 is set at the normal loading position by the urging pressure of
14 and engages therewith. 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 120 is configured to close only when the bucket 102 is in a properly loaded state. The output terminal 130 of the contact 120 is connected to the control device 60 as shown in FIG. 2, and the control device 60 can thereby detect whether the disk pack 200 has been loaded normally. Contact 120 thus constitutes a load switch shown in FIG.

Furthermore, an opening 122 is provided at the bottom of the packet 102 as shown by a 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 pack 200
, which is pressed and closes the contact 124. If the disk pack 200 is not properly inserted into the packet 102, the contact 124 will not close.The output terminal 132 of the contact 124 is connected to the control device 60 as shown in FIG. The control device 60 can detect the presence or absence of the disk pack 200.

Contacts 124 thus constitute the pax inch shown in FIG.

In this embodiment, each track of the magnetic disk 16 has a fifth track.
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 N001. Track selection or tracking control is performed by counting the number of trunks, ie, the number of envelope peaks, as the head moves, using this reference position, ie, the original return position HP, as a reference. The control device 60 determines that the magnetic head 26 has reached the original return position HP of the magnetic disk 16 based on the detection output of the home position switch 125.

Tracking by mountain climbing control is performed as follows. First, assume that the magnetic head 26 is already on a certain track. When the forward switch 5 or the reverse switch 6 is operated, the control device 60 activates the step motor 30 by the drive circuit 50 to move the magnetic head 26 in the forward or reverse direction.

In this embodiment, the magnetic head 26 is first moved in the forward or reverse direction by a distance slightly shorter than the inter-track pitch of 100 μl, for example, about 96 μm for 23 pulses. At this time, the envelope of the signal read by the magnetic head 26 is detected by a detection circuit 38, and is input from the ADC 46 to the control device 60 in the form of digital data. Therefore, the control device 60 further moves the magnetic 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 that of the previous envelope.

In this way, while the magnetic head 26 is being transferred, the control device 60
detects and compares the envelope levels each time, and determines the position where the envelope peaks. The head position where this peak is detected is the position where the head is correctly on-track to that track. In this way, the control device 60
Perform mountain climbing tiger noking.

In order to quickly on-trunk to the normal track position in such hill-climbing tracking, it is desirable to return the magnetic head 26 to the original return position HP by the time the tracking starts.

FIGS. 6A to 6E are flowcharts showing control details associated with switch operations of each part in the present invention. (The numbers in parentheses are the step numbers or processing steps in the diagram.)
- indicates). First, when the power switch 2 is turned on, it is reset (300), and the memory contents stored up to now are cleared by RAM clear (302). Next, the key scan (304) detects six switches, namely the back switch (Pack SW) 124, the home position switch (key, 5W) 125, and the load switch (
Load song) 120, forward switch (Fwd S
W) 5, Reverse switch (Rev SW) 6,
) Rack number inch (Tr No, SW) 7
is scanned with a 1V pulse.

In other words, this 1V pulse is flow 3 with a period of 1/60 seconds.
Scan the routine from 06 to flow 309, and
The on/off status of the six keys is determined every 0 seconds.

Next, a warning process when the forward button 5 or the reverse button 6 is pressed without the magnetic disk pack 200 being attached to the main body of the apparatus will be explained. First Ste Nobu 3
When it is determined in step 308 that the back switch 124 is in the on state by the key scan starting at 04, a flag PACK indicating that the magnetic disk pack 200 is loaded in the packet 102 is set in step 311.
F is set and the process moves to step 332.

On the other hand, if it is determined in step 308 that the back switch 124 is in the OFF state, the flag PAC is set in step 310.
It is determined whether KF is set (1). If the flag PACKF is set, the process proceeds to step 313, where the flag INT indicating that the initial processing has been executed is reset,
Next, in step 315, the flag PACKF is reset, and the process moves to step 344 in FIG. 6B.

If it is determined in step 310 that the flags PA and CKF have been reset, the process proceeds to step 312;
The home position switch 125 is activated by step 312.
It is determined whether or not it is turned on. If the home position switch 125 is in the OFF state, the head 2
Since the head 6 has not returned to the original return position ( ) (P position), the head 26 is sent back toward the home position switch 125 by the head reverse feed (314). When the head 26 reaches the home position, step 31
The determination obtained by the key scan in step 2 is that the home position switch 125 is turned on (316), and then in step 31B it is determined whether the packet 102 is closed in the normal position, that is, whether the load switch 120 is turned on. Ru. If the 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 packet 102 is closed in the normal position, that is, when the load switch 120 is turned on (322)
In step 324, it is determined 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 324 that the forward switch 5 or reverse switch 6 is in the on state (<328), the recording/reproducing apparatus issues a warning (330). The logical state of each switch in flow 328 is as follows. (Hereinafter, similarly, Figures 6A to 6
They are listed sequentially in Figure B. ) This warning process can take various forms. That is, for example, L
Possible modes include emitting the ED warning light 8, flashing the screen, flashing the number display, or emitting a warning sound. Or packet 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, if the forward switch 5 or the reverse switch 6 is pressed while the magnetic disk pack 200 is not loaded into the packet 102, a warning is issued.
The magnetic head 26 will not be moved without being inserted.

Next, in the magnetic recording/reproducing apparatus according to the present invention, the magnetic head 2 is
6 is located on the same track of the magnetic disk for 18 consecutive minutes, a warning is issued, and the magnetic disk 10 is automatically stopped or the magnetic head 26 is moved out of the recording area. This warning process will be explained. First, 6th A
At step 332 in the figure, it is determined that the magnetic head 26 has been playing the same track for 18 consecutive minutes or more based on whether the 18-minute timer has reached 0 (
334), forward switch 5 by step 336
Alternatively, it is determined whether the reverse switch 6 is turned on. If it is determined in step 336 that the forward switch 5 or reverse switch 6 is in the OFF state (338), a warning process 33 similar to that described above is performed.
0 is made. Further, when the operator learns of the abnormal state from such a warning process 330 and turns on the forward switch 5 or the reverse switch 6 (340), the 18-minute timer is reset and the flow returns to the original routine again. As described above, according to the magnetic recording/reproducing device of the present invention, if the magnetic head is located on the same track for more than 18 minutes, a warning is issued to notify the abnormal state, and the magnetic disk is automatically stopped or the magnetic head is stopped for recording. Since it is evacuated outside the area, it will not damage the tracks of the magnetic disk.

Next, in step 344 of FIG. 6B, packet 102
If it is determined that it is not closed in the normal position (346)
, the disk motor 12 remains in a stopped state (320
).

Further, if it is determined in step 344 that the packet 102 is closed in the normal position (34B), the disk motor 12 rotates (35O).

Next, the 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 INT has been reset (354), it is determined in step 356 whether or not the home position switch 125 is in the on state. will be judged. If it is determined in step 356 that the home position switch 125 is off (
358), the magnetic head 26 is reversed (360) and moves toward the home position switch 125. When the magnetic head 26 eventually reaches the home position and it is determined in step 356 that the home position 125 is in the ON state (362), an initial tracking operation (or unrecorded pack detection) is performed in step 3.
64. In step 364, in which an initial tracking operation is performed, the first track is found by the above-mentioned hill-climbing tracking operation, and when this initial tracking operation is completed, a flag INT is set indicating that the initialization process has been completed (366). Flag INT
The flow that sent the key is returned to the original routine again, and on the other hand, the process moves from step 352 to step 370 in FIG. 6C, so the initial operation routine will not be executed at the next key scan. Further, in the magnetic recording and reproducing apparatus according to the present invention, step 36 of performing an initial tracking operation is performed.
In step 4, an operation for detecting unrecorded backs is also performed. That is, if the user of the magnetic recording/reproducing device accidentally inserts an unrecorded back, the magnetic head 26 searches the entire trunk and issues a warning if it determines that there are no recorded tracks, that is, if it determines that the back is an unrecorded back. is emitted to notify the user that the bag is unrecorded.

Next, the timer playback settings for images will be explained. The basic image timer playback time is set to 8 seconds,
This timer playback setting can be made by depressing the forward switch 5 a predetermined number of times while the display switch 7 is on, to reduce the timer playback time in 1 second increments, and then with the display switch 7 on, pressing the reverse switch 6 a predetermined number of times to take a still image. You can increase the playback time by 1 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. When it is determined that the forward switch 5 is turned on (376), it is determined in step 378 whether the forward switch 5 has been newly turned on or has been kept pressed. forward switch 5
If it is determined that the button was pressed and held down (
380), 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 the playback is being performed for 1 second. timer counter is 1
(386), in this case, no matter how many times the forward switch 5 is pressed, the minimum playback time is 1.
seconds and the flow returns to the original routine. Next, if it is determined that the timer counter is not 1 (388), one second is subtracted from the timer counter. That is, when the forward switch 5 is pressed anew when the playback time is 5 seconds, for example, the timer counter is decremented by 1 (390), so that the one hour timer becomes the playback time of 4 seconds. In this way, each time the forward switch 5 is pressed while the display switch 7 remains on, 1 second is subtracted from the timer counter, and the playback time is 1 second.
When the second is reached (386), the 1-second playback setting time is repeated 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 6 is newly turned on, step 402 and step 404
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 there is an infinite stationary time (406),
No matter how many times the reverse switch 6 is pressed, the infinite pause time remains unchanged and the key scan returns to its 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 repeatedly pressed and the timer counter reaches 9, the playback time becomes infinite. As explained above, according to the magnetic recording and reproducing apparatus according to the present invention, the display switch 7
Each time the forward switch 5 is pressed while the display switch 7 is on, the playback time is subtracted by up to 1 second, and the playback time can be increased by 1 second by pressing the reverse switch 6 a predetermined number of times while the display switch 7 is on. can.

Next, a method of erasing the number display 49 on the screen will be explained. In this erasing method, the number display 49 is erased by turning on the display switch 7 during display. That is, if it is determined in step 412 of FIG. 6C that the display switch 7 has been newly turned on (414), and it is determined in step 416 that the on operation was performed while the track number is being displayed ( 41
8), the number display is erased and set to non-display mode (420). Next, when it is determined that switch 7 will be turned on again while the switch is not displayed (422), the 2-second timer is reset (424), and the trunk number is displayed for only 2 seconds after the switch is released (426). The display mode is set (428). In addition, if it is determined that the display switch 7 has not been newly turned on and is determined to be in a state of being pressed continuously (430), if the display switch 7 is not in the non-display mode in step 431 (432), the 2-second timer is reset. (424), then the trunk number is displayed (426), and the display mode is set (428).
.

Next, a method for canceling timer playback using the magnetic recording and playback device according to the present invention will be described. Timer regeneration is canceled by turning on the forward switch 5 or the reverse switch 6 during timer regeneration. That is, the sixth
If timer playback is in progress at step 434 in FIG. If not (440), it is determined in step 442 whether the timer is zero. If the timer is zero, a predetermined timer playback time is set again (446), and a tracking operation is performed for the next track (448). If it is determined in step 438 that the forward switch 5 or reverse switch 6 is turned on (450), it is determined in step 460 whether the forward switch 5 or reverse switch 6 has been newly turned on. Step 4
In step 60, if the forward switch 5 or reverse switch 6 is not newly turned on (462), the routine returns to the normal routine, and if it is newly turned on (464), the timer regeneration is canceled. (466). That is, the timer counter is set to 9,
The timer is cleared as soon as it stops <46
8). As a result, the reproduced image is displayed on the display device 49 in an infinite reproduction time state. As described above, according to the rotary magnetic recording and reproducing apparatus according to the present invention, timer reproduction can be canceled by turning on the forward switch 5 or the reverse switch 6 during timer reproduction.

Next, the search mode of the magnetic recording/reproducing apparatus according to the present invention will be explained. First, in step 470 of FIG. 6E, it is determined that the forward switch 5 or reverse switch 6 is turned on (472), and then in step 474 it is determined whether tracking is in progress.

If tracking is in progress, return to the original routine (476)
, if tracking is not in progress, the track number will be displayed 49
is erased (478). Next, in step 480, it is determined whether the forward switch 5 or the reverse switch 6 has been newly turned on, and if it has been newly turned on, the ranking operation is performed in step (484).
), the 1 second timer is reset and the original routine returns. If the forward switch 5 or the reverse switch 6 is kept pressed in step 480 (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 the 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-second timer is cleared (494), and then the tracking It is scanned (496). After the tracking operation is completed, set the track number 49 to 1730 for a 2V period.
Display for seconds. (498). As described above, according to the embodiment, by continuing to press the forward switch 5 or the reverse switch 6, the screen can be sequentially advanced frame by frame at high speed, and the 2V period (1
The trunk number 49 is displayed for only 30 seconds) and the necessary screen can be searched.

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).

FIGS. 7A to 7E are flowcharts showing the processing contents of the subroutine in the embodiment of the present invention.

Here, FIGS. 6A and 6B are flowcharts that explain what kind of interrupt is caused by each key, focusing on the state of each key read by the key scan performed in the IV cycle, and will be used in the following explanation. FIGS. 7A to 7E explain the functions of the apparatus, focusing on the operation of the apparatus.

First, a routine for searching the first trunk in the initial operation will be described with reference to FIGS. 7A and 7B.

Power switch 2 is on or load switch 12
When 0 is turned on (500), it is determined in step 502 whether the display switch is on. When the power switch 2 or load switch 120 and display switch 7 are pressed at the same time (504), the special mode is set (
506), the number display is an absolute address (that is, the address is assigned according to the number of distances the head moves). If the display switch 7 is not turned on in step 502 (508), the normal mode is set (510).
, the number is displayed using a relative address (that is, only the number of recorded tracks is counted and an address is assigned to this track). The operations up to this point correspond to the reset at step 300 in FIG. 6A. Next, the RAM is cleared (512), and the memory that has been stored up to now is cleared. Next, the key is scanned (514) by a pulse rotating at a cycle of lV, and the home position switch 125 is
It is determined whether or not it is in the on state (516). The following operations correspond to the initial tracking and unrecorded puncture detection operations that are interrupted from step 352 in FIG. 6B. If the home position switch 125 is not on (518), the magnetic head 26 is turned on by one unit (100μ).
m) move in the opposite direction. This operation is repeated while the home position switch 125 remains on. When the home position switch 125 is turned on (
524), (move the ft head 26 by a predetermined distance in the forward direction 526), count the number of head movement distances 528
), and in step 530 it is determined whether or not the home position has been moved by 60 track widths. Step 53
0, if it has not moved 60 track widths counting from the home position, the detection output of the envelope will be
The D value is read (536), and it is further determined in step 538 whether the A/D value is greater than or equal to a predetermined value. A/D
If the value is less than the predetermined value (540), it means that the head 26 has not moved to the first recording trunk, so the head 26 should be moved in the forward direction again (526).
, the above operation is continued until the A/D value reaches a predetermined value or more, that is, the first
Repeat until the th recording track is reached. If this operation moves 60 track widths (532),
It is determined that there is an unrecorded puncture, and a warning is issued, and the magnetic head 26 is muted and the movement of the magnetic head 26 is stopped (534). In step 538, when the A/D value exceeds a predetermined value, the non-recording flag, which is set to 1 when the track is an unrecorded track, is set to zero, and the track number is set to 1 (542).
. Further, this number 1 track is tracked with the mountain climbing servo (544) to find the peak value, and the track number is displayed for only 2 seconds (546). In this way, the number l track can be located during initial operation.

The above is the explanation of the initial operation.

Next, we will explain the operation of sequentially searching for the second and subsequent tracks, and further explain the operation when there are two or more consecutive unrecorded tracks or dropout tracks among them, with reference to Figs. 7C and 7D. Refer to and explain. In the embodiment of the present invention, if two or more unrecorded trunk tracks or dropout tracks exist in succession, all subsequent tracks are determined to be unrecorded portions and a warning is issued. First, when searching from the first track to the second trunk, it is determined in step 548 whether the forward switch 5 is turned on, and if it is turned on, the track number display is turned off. 550), then step 55
In step 2, it is determined whether the track number displayed is 50 or more. If the track number display is 50 or less, it is determined in step 554 whether the number of head movement distances counted from the home position is 60 or more. If the number of head movement distances is 60 or less, it is determined in step 556 whether the no-record flag is 1 or not. This no-recording flag is a flag indicating whether the trunk tracked in the previous operation was an unrecorded track or a dropout track, and when the no-recording flag is 1, the trunk number will be It is used to count only the recorded tracks without adding them. Since the no-record flag is set to zero in step 542 of the search operation for the No. 1l rack, the no-record flag is not 1. Therefore, 1 is added to the track number, and the head movement distance counted from the home position is Add 1 to the number (560) and press the magnetic head 26.
562) The A/D value of the envelope detection output is read (580).

On the other hand, in step 548, the forward switch 5
If not pressed (564), it is determined in step 566 whether the reverse switch 6 has been pressed. If it is determined in step 566 that the reverse switch has been pressed, the track number switch is turned off (568), and then in step 570 it is determined whether the track number is 1 or less. If the track number is 1 or more, the no record flag is set to 1 in step 572.
If the no-record flag is zero, 1 is subtracted from the track number display (574), and 1 is further subtracted from the head movement distance from the home position.

Next, move the magnetic head 26 in the reverse direction by 24 pulse widths (100 pm).
/D value will be read (580).

Now, as described above, returning to the case where the forward switch 5 is turned on to search from the first track to the second track, in step 582 it is determined whether the A/D value is greater than a predetermined value, If the /D value is above a predetermined value, a tracking operation is performed using the mountain climbing servo (584), and further, in step 586, it is determined whether the forward switch 5 or the reverse switch 6 is pressed in the search mode, that is, 1 sand is retrieved. It is determined whether or not the button is pressed up continuously. If it is not the search mode, it is determined in step 58B whether or not it is the display mode, and if it is the display mode, the track number is displayed for only 2 seconds (590). Next, the process returns to step 548 again using the interleaving number 2, and by repeating the above-described operations, the magnetic head 26 moves up to 50 tracks or until it moves 60 track widths counting from the home position switch. Furthermore, step 586
If it is determined that it is in search mode, (5
92),) Move the magnetic head 26 while displaying the rack number display for a 2V period (1/30 seconds) (594
).

Next, the case where there are consecutive unrecorded tracks in the track search after the second track will be described with reference to FIG. 7E. First, in step 582, if the A/D value is less than a predetermined value, that is, in the case of an unrecorded track, it is determined in step 596 whether or not it is a special mode. Returning to the routine, if the mode is not a special mode (600), it is determined whether the no-record flag is 1 or not in step 602, which is passed with an interlace number of 0. Since the no-record flag is set to zero as described above, it is determined that the no-record flag is not 1 (604), and then the no-record flag is set to 1 (606). Next, in step 608, it is determined whether the track number is 50 or more, and if not, in step 610, it is determined whether the number of head movement distances counted from the home position is 60 or more. If the number of head movement distances is not 60 or more (612)
, in step 614, it is determined whether forward feeding is to be performed. If forward feed is determined in step 614 (616), the skip number ■ is reached, and then in step 552 it is determined whether the track number is 50 or more. If the track number is 50 or less in step 552, then it is determined in step 554 whether the number of head movement distances is 60 or more, and if the number of head movement distances is 60 or less, no recording is performed in step 556. It is determined whether the flag is 1 or not.

Since the no-recording flag is set to 1 as described above (606), the no-recording flag is determined to be 1 at step 556 (618), and the addition of 1 to the track number display (55B) is bypassed. The head movement distance number 1 is added (560).

Next, move the head 26 by 100 μm again (562),
Read the A/D value of the envelope detection output (580).

If the A/D value is greater than a predetermined value, it is determined that there is only one unrecorded track, and the tracking operation and trunk number display are performed in steps 584 and below. Here A/
If the D value is not greater than a predetermined value (600), then the skip number 0 is reached, and in step 602 it is determined whether the no-record flag is 1 or not. As described above, since the no-record flag is set to 1, it is determined that the no-record flag is 1 (620), and then in step 622, it is determined whether the moving direction is forward.

Since the movement direction is set to forward, flow 6
24, and the moving direction is switched from forward to reverse (626). Thereafter, in step 614, it is determined whether the track number is forward or not, and since the moving direction is set to reverse as described above (636), the process returns to the jump number ■, and in step 570, it is determined whether the track number is 1 or not. Ru. Since the trunk number is not less than 1, the process advances to step 572, where it is determined whether the no-record flag is 1 or not. Since the no-record flag is set to l, the subtraction of 1 from the track number display (574) is bypassed, and the next step is subtracted by the number of head movement distances (574) in flow 628.
76). Next, the head is moved in the reverse direction by 100 μm (578), and the A/D value of the envelope detection output is read (580). However, at this position, the magnetic head is located at the first unrecorded track position, so A
The /D value does not exceed a predetermined value, so it is determined in step 582, the process passes through step 596 and flow 600, and following the interlace number ■, it is again determined in step 602 whether the no-record flag is 1 or not. Since the no record flag is 1 (
620), then step 6 to determine whether the moving direction is forward.
Judgment will be made in 22. Since the direction of movement is not the forward direction (630), the no-record flag is then reset to zero (632), and the number of head movement distances is set to 61 (634). This brings the record to 30
Assuming that the 31st and 32nd tracks are unrecorded, the 31st track is counted from the home position, the head movement distance is set to 61, and the last recorded track is recorded. For the 30th track, the number of moving distances counted from the home position is set to 60, so the control device 60 determines that the track after this is outside the recording area. Next, in step 614, it is determined whether the track number is forward or not, and since it is cented in the reverse direction (636), the track number continues to the jump number @, and then in step 570, the track number is changed to 1.
Since the track number is greater than or equal to 1, it is further determined in the next step 572 whether or not the no-record flag is 1. Since the no-record flag is set to zero (632), the rack number is subtracted by 1 (574), then the head movement distance number is also subtracted by 1, (576), and then the magnetic head 26 is moved by 100 μm. Move in the opposite direction (57 B).

Then, read the A/D position of the envelope detection output. At this point, the magnetic head 46 has been sent in the opposite direction through the two unrecorded tracks and is on the final recording track, so the A/D
The value is determined to be above a predetermined value, and the mountain climbing operation (584), I-rack number, and display (590) are repeated again with tracking operations of 584 or less. Furthermore, when the forward switch is pressed in this state, since the head movement distance number is set to 60 as described above, it is determined in step 554 that it is 60 or more (6'44), and a warning process is performed. (642). This is a warning that the forward switch 5 has been pressed even though the magnetic head 26 is already located at the final recording track. This final track setting is set in the RAM unless the above-described initial operation is performed.

In the above embodiment, for example, if the forward switch is pressed at the track number 50 position (548)
In step 552, it is determined that the track number is 50 or more (638), and a warning process is performed (638).
42). Conversely, when the reverse switch is pressed on track N06l (566), the track number is not determined to be greater than or equal to 1 in step 570 (64).
0), a warning process is similarly performed (642).

The processing described here corresponds to the tracking subroutines 484 and 496 shown in FIG. 6E among the interrupt processing in FIGS. 6A to 6E.

FIG. 8 is a front view of a remote controller 80 that is connected to the remote control connector 9 shown in FIG. 1 and remotely controls the main body. In the remote controller 80, a forward button 82, a reverse button 84, and a display button 86 each having the same functions as the forward switch 5, reverse switch 6, and display switch 7 are arranged on the upper stage. Furthermore, above the reverse button 84, there is an LED 8B that operates in the same way as the LED 8 provided on the main body of the device.
is provided. Also, at the bottom of the panel is a playback time setting knob 90 (sliding type) for setting the time to switch the screen forward or backward at predetermined intervals.
is provided. An automatic forward (A, FWD) button 92 for automatically forwarding the magnetic disk 1 in the forward direction according to the time set by the knob 90;
Reset buttons 94 are provided close to the knobs 90 to output a reset signal for locating the beginning of No. 6, that is, returning the magnetic head 26 to the first track. A.FW
In order to confirm the operation of each of the D buttons 92 and reset buttons 94, LEDs 96 and 98 are provided above each button.
is provided. In addition, in order to cancel the function of A, FWD button 92 midway, use STILL button 1.
00 is set. The remote controller 80 configured as described above is connected to the socket 9 of the main body by a plug 702 attached to the tip of the connection cord 700.

FIG. 9 is a circuit diagram showing the main parts of the electric circuit of the remote controller 80. The forward button 82 is connected to a DC power source (10 B) via a resistor 706, and its hot side is connected to one input terminal of a NAND gate 708, and the reverse button 84 is connected to a DC power source (10 B).
via a resistor 710, and its hot side is connected to one input terminal of a NAND gate 712. The output signal of NAND gate 708 becomes a forward command signal, and the output signal of NAND gate 712 becomes a reverse command signal. A NAND gate 714 is connected to the other input terminal of the NAND gate 708, and its output signal becomes a low (hereinafter referred to as "L") level when the A, FWD button 92 is operated. . Therefore,
NAND gate 714 is high (hereinafter referred to as 'H').

) level, if the forward button 82 is operated, the NAND gate 708 becomes "H" level and a signal is generated. The other input terminal of the NAND gate 712 is commonly connected to one input terminal to form an inverter. Therefore, when the reverse button 84 is operated, the output of the NAND gate 712 becomes "H" level, and a reverse command is issued. A signal is generated.

In addition, the power supply (1,000B) is a PNP type transistor 71B.
The emitter of is connected, and a resistor 7 is connected between its collector and ground.
20 LEDs 8B are connected in series. This LED 8B is used to notify various warnings, power ON, etc., and is controlled to turn on and off by an LED signal applied to the base of the transistor 718.

The oscillator 722 changes the pulse oscillation frequency depending on the resistance value of a variable resistor 724 (linked to the knob 90) connected as an external component. A circuit including a resistor 726, a capacitor 728, a resistor 730, and a variable resistor 724 connected to the oscillator 722 forms a time constant circuit.

The output terminal of oscillator 722 is connected to one input terminal of NAND gate 714. A, one end of the FWD box 92 is connected to a DC power supply (10B), and the other end is grounded via a resistor 734. Further, the still button 100 has one end connected to a DC power source (10 B) and the other end connected to ground via a resistor 738. A, the cold side terminal of the FWD button 92 is connected to the clock terminal of the flip-flop (D-FF) 740,
“A” is sent to the Q terminal in synchronization with pressing the FWD button 92.
An output signal of H level is generated. flip flop 74
The other input terminal of the NAND gate 714 is connected to the Q terminal of 0, and the base of the transistor 744 is connected via a resistor 742. Transistor 744 is N
It is a PN type and is used as a common emitter circuit, with a resistor of 746
A series circuit of LED 96 and LED 96 is inserted as a load.

CLI of flip-flop 740? The cathode side of a diode 756 is connected to the terminal (reset terminal), and its anode side is connected to the cold side terminal of the still button 100, and at the same time as the still button 100 is operated, the flip-flop 740 is reset and goes to "H" level. The Q terminal that was there changes to "L" level. Further, the anode side of a diode 760 is connected to the hot side of the resistor 734, and the cathode side of the diode 760 is connected to the input terminal of the differentiating circuit 764. The output terminal of the differentiating circuit 764 is connected to the reset terminal of the oscillator 722, and when the A, FWD button 92 is operated, the oscillator 722 is returned to the initial state. The reset circuit 900 is a circuit that creates a reset signal for moving the magnetic head 26 to the first track when the magnetic head 26 moves to the final track while the FWD button 92 is operated. In the reset circuit 900, 902 is an input circuit to which a warning signal input to the base of the transistor 718 is input, and the input circuit 902 includes a diode 904 and a resistor 906.9.
08, a capacitor 910, and a buffer 912. 914 is an AND gate that calculates the logical product of the output signal of the flip-flop 740 and the output signal (warning signal) of the input circuit 902, which are output in synchronization with the operation signal of the FWD button 92; The output signal is input to one input terminal of OR gate 920.

Note that the output signal of the flip-flop 740 is output from the OR gate 9.
The signal is input to one input end of the 56.

Further, a reset switch 916 is connected between the DC power supply (10B) and ground via a resistor 918, and the operation signal of the reset switch 916 is input to the other input terminal of the OR gate 920. The output signal of the OR gate 920 is input to a mono multi-pipe lake 922, and the output signal of the mono multi-pipe lake 922 is configured to be further input to another mono multi-pipe lake 930.

Here, the pulse width TI of the output signal of the mono multi-vibrator 922 is, for example, 2 sec, and the pulse width T2 of the output signal (reset signal) of the mono-multi high break 930.
(for example, 30 m5ec). The mono multi-high break 922 causes the magnetic head 26 to alternately move forward and backward over the magnetic disk when a warning signal is intermittently input to the AND gate 914 or when the reset switch 916 is turned on and off continuously. This is provided to prevent this from occurring, as this can cause hunting.

Furthermore, the reason for providing the mono multi-by-break 930 is to use a pulse signal with a sharp rise (narrow pulse width) as a reset signal in order to improve responsiveness. Further, the resistor 924, the transistor 926, and the LED 92B constitute a display circuit 940 for displaying the reset state.

Note that the reset circuit 900 includes a switching transistor 95 operated by a reset signal as shown in FIG.
4th prize is also included.

Next, the operation of the reset circuit 900 will be explained with reference to the time chart shown in FIG. In the above configuration, when the A, FWD button 92 is operated at time t1,
Flip-flop (F'F) 7 is synchronized with this operation signal.
An output signal of "H" level from the Q terminal of 40 is inputted to one input terminal of the AND gate 914 (Fig. 10(a)).
, (b)). Thereafter, when the LED signal is input to the base of the transistor 718 at time t2, the inverted signal is sent to the diode 90 of the input circuit 902 as a warning signal.
4. Input to buffer 912 via resistor 906.

The warning signal shaped by the buffer 912 (FIG. 10)
C)) is input to the other input terminal of the AND gate 914, and as a result, a pulse train signal having the same timing as that of the buffer 912 is output from the AND gate 914 (FIG. 10(d)). When the reset switch 916 is not operated (off state), the output signal of the AND gate 914 is directly output from the OR gate 920 to the mono multi-bi break 922, and the mono multi-bi break is activated at the rising edge of the first pulse (time t2). 922 outputs a pulse signal with a constant pulse width (for example, 2 seconds) to the base of the transistor 92G via the monomulti-by-break 930 and the resistor 924 (FIG. 10(e)).
. From the mono multi-high break 930, a pulse signal with a narrower pulse width (for example, 30 m5ec) is outputted to the terminal 950 as a reset signal at the rising edge of the output signal of the mono multi-bi break 922.

Also, time t3 of the pulse train signal of the AND gate 914
, t4, and t5 are output within the period of the pulse width of the mono-multi-by-break 922.
Masking is performed, and output of the reset signal from the mono multi-by-break 930 to the terminal 950 is prohibited until a time corresponding to the pulse width T1 has elapsed from time t2.

On the other hand, the transistor 926 becomes conductive due to the output signal of the mono-multi-by-break 922, and the LED 928 lights up to indicate the reset state (the state in which the magnetic head 26 is moved toward the first track).

When the reset operation is performed using the reset switch 916, the same operation is performed as the reset operation using the output signal of the AND gate 914 as described above. However, AND gate 914
The reset operation using the output signal is performed when the magnetic head is located at the last track, but the reset operation of the reset switch 916 can be performed at any track, and therefore the magnetic head is moved from any track to the first track. You can go back to.

As explained above, according to this embodiment, when a warning signal is output intermittently or when the reset switch is turned on,
Since these signals are masked for a certain period of time even if the OFF reset operation is performed continuously, it is possible to prevent hunting in the moving operation of the magnetic head. Furthermore, if a retriggerable type is used as the mono multi-by-break 922, the period during which the output of the reset signal is prohibited can be extended.

FIG. 11 is a circuit diagram of a Swiss matrix circuit connected to the input/output terminals of the remote controller 80 of FIG. 9. Human power lines A2, A3 and output line H1 in a grid pattern
, H2, and H3 are wired, and a voltage of a certain level is applied to each line in a binary state. Line H2 and Line A
A transistor 800 is connected between the two, and the FWD signal output from the NAND gate 708 is connected to the transistor 800.
Applied through R gate 956. Furthermore, line H
A transistor 802 is connected between the line A3 and the line A3,
Its base is connected to the R output from the NAND gate 712.
An EV signal is applied. Also, line H1 and line A3
A diode 804 and a display switch 86 are connected in series and inserted between them. Line H1 and line H2 are connected through a series circuit of diode 806 and back switch 124, and line H3 and line A2 are connected through a series circuit of diode 808 and home position switch 125, respectively.

Further, a reset circuit 900 is provided between the line H3 and the line A2 to temporarily change the back switch 124 to a state equivalent to a non-operating state. The reset circuit 900 is as shown in FIG. 9, but some parts are omitted in FIG. 11. Here, the reset circuit 90
0, the remote controller member may be provided on the main body side of the magnetic recording/reproducing apparatus.

Now, when a specific point on the H line and the A line becomes electrically conductive, the combination of functions as shown in the following table can be obtained by key scanning the electrically conductive state. That is,
In combinations as shown in the table below, the same functions can be achieved by connecting both lines with a mechanical switch or a semiconductor switch as shown in FIG.

In the above configuration, when neither button is operated, the inputs of the NAND gates 708 and 712 are both at "H" level, so the FWD signal and the REV signal are not generated. If the FWD button 82 is pressed in this state, one input of the NAND gate 708 will be “L”.
” level, the output terminal of the gate 708 becomes “H” level.
'' level signal is output, which becomes the F W D signal. This signal is applied to the base of the transistor 800 via the OR gate 956 shown in FIG.
2 and the line A2, and the same state as when the forward switch 5 on the main body side is pressed is realized. When the REV button 84 is pressed, the NAND gate 712 operates in the same manner as described above to generate the REV signal, which causes the transistor 8 on the main body side to operate.

2 is turned on, and the state is the same as when the reverse switch 6 is operated. Further, when the display button 86 is operated, the line H1 and the line A3 are brought into conduction via the diode 804, and the same state as when the display switch 7 on the main body is pressed is realized.

When the device is powered on, the LED 88 lights up.

In addition, even under conditions in which a warning should be issued in each of the above-mentioned processes, the LED 88 lights up or blinks continuously in exactly the same way as the LED 8 provided on the main body of the device. Such control is carried out by the control device 60 shown in FIG.
This is done by continuously or intermittently sending out an H'' level signal for a certain period of time.

In addition, the puncture switch 1 is pressed during the playback operation of the magnetic recording and playback device.
24, the control device 60 outputs an H level signal to the line H1. When the bank switch 124 is outputted, it is determined that the bank switch 124 is in the on state.

Here, it is assumed that the impedance inside the control device 60 at the terminal of the control device 6O to which the line H3 is connected is configured to be low. manipulated,
It is assumed that during timer reproduction, the magnetic throat 26 moves to the last trunk on the magnetic disk, and reproduction of the last recorded image is completed. At this point, the bank switch 124 is in the on state and the home position switch 125 is in the off state. Furthermore, since the output of the Q terminal of the flip-flop 740 (Fig. 9) is at the 'H' level due to the operation of the A, FWD button, an 'H' level signal is output to the base of the transistor 800 via the OR gate 956. line H2 and line A2 are in a conductive state.Then, at the end of playback, the control device 60 sends a warning signal via the line H3, that is, an LED signal for blinking the LED 8B (or lighting it continuously for a certain period of time). is the transistor 718
is output to the base of

On the other hand, since the warning signal (LED signal) is inputted to one input terminal of the AND gate 914 via the input circuit 902 in FIG. A signal is output, transistor 954 becomes conductive,
Line H3 and line A2 become short-circuited. As a result,
Even though the puncture switch 124 is in the on state, the impedance inside the control device 60 at the terminal of the control device 60 to which the line A2 is connected becomes low, so even if an H" level signal is output from the line H1. Line A
2, a +1 La level signal is output, and the state is equivalent to that of the back switch 124 being turned off (non-operating state B).

The control device 60 determines that the back switch 124 has changed from the on state to the off state, and moves the magnetic head 26 from the final track to the original return position HP. magnetic head 2
When the home position switch 125 is turned on, the control device 60 moves the magnetic head 26 to the position adjacent to the original return position HP on the magnetic disk. Move it up to 1 track and start the playback operation.

In this way, according to this embodiment, automatic projection is possible.

In the above embodiment, the remote controller 80 is connected to the main body using a connection cord, but it is also possible to configure the remote controller 80 without using a cord. for example,
Infrared rays, ultrasonic waves, etc. can also be used. In this case, since it is necessary to control the LED 8B from the main body side, it is necessary to provide a transmitter and a receiver on each of the main body side and the remote control side.

Further, various alarms generated on the main body side are displayed by the LED 88 provided on the remote controller 80, but an acoustic means such as an electronic buzzer may be used instead of the LED. A again.

The magnetic head is moved to the first track only when the FWD button is operated and a warning signal is output, so in the case of automatic forwarding, the magnetic head can be reliably moved when the last track has finished playing. It can be moved to the first track.

〔Effect of the invention〕

As explained above, in the magnetic recording device according to the present invention,
In the case of automatically advancing the magnetic head, it is determined that the magnetic head has moved to the final track and playback has been completed when an operation signal for automatic advancing is output and a warning signal is output. Since the magnetic head is configured to move to the first track, automatic projection is possible according to the present invention.

[Brief explanation of drawings]

FIG. 1 is an external configuration diagram of a magnetic recording device according to the present invention, and FIG.
3 is a block diagram showing a circuit configuration of a magnetic recording device according to the present invention, FIG. 3 is a perspective view showing an example of a magnetic disk back that can be used in the device shown in FIG. 1, and FIGS. 4A and 4B are FIG. 5 is an explanatory diagram showing the disk back loading section of the device, FIG. 5 is an explanatory diagram showing the track arrangement on a magnetic disk applicable to this device, and FIGS. 6A to 6E are the control contents of the control device shown in FIG. 2. 7A to 7E are flowcharts showing the processing contents of the subroutine of the control device, FIG. 8 is a front view of the remote controller according to the present invention, and FIG. 9 is a detailed circuit of the remote controller shown in FIG. 8. 10 is a time chart showing the operation of the remote controller shown in FIG. 9, and FIG. 11 is a circuit diagram of a key matrix circuit portion inside the main body connected to the remote controller shown in FIG. 8. 80...Remote controller, 82...Forward button, 84...Reverse button, 8
6...Display button, 88...LED, 90...
・Playback time setting knob, 92...Automatic forward (A, FWD) button, 96.98・
...LED, 100...STILL button, 124...Back switch, 125...
・Home position switch, 718.800,8
02... Transistor, 722... Oscillator, 7
24... Variable resistor, 740... Flip-flop, 900... Reset circuit. Figure 1 Figure 3 Figure 5 HP #1 23 4
4B4950 Figure 4A Prisoner 48 Figure 6B Figure 7A Figure 7B Prisoner 7D @ 7E 1) lI) bJt5 Figure 8 i Figure 10

Claims (1)

[Claims] In a magnetic recording and reproducing device that performs recording or reproducing by moving a magnetic head in the radial direction of a magnetic disk, a warning signal is provided when the device enters an operating state other than a normal recording or reproducing state. A warning means for outputting a warning, an operating means for outputting an operating signal for automatically moving the magnetic head in a forward direction, a storage means for storing an output state of the operating means, and a warning signal and storage means for the warning means. and a control means for receiving the reset signal from the reset means and moving the magnetic head from the last track to the first track. A magnetic recording/reproducing device characterized by having: