JPS629570A - Rotary magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain automatic display by deciding the recording/unrecording state of a picture data at each track of a magnetic disc and returning the magnetic head to the 1st track in the recording state when the final recording track is detected. CONSTITUTION:Tracks with the youngest number to the oldest number are formed concentrically from the outer side toward the center on the recording face 16 of a magnetic disc 10 and the home position HP of a magnetic head 26 is set further outside than the outermost tract No.1. The head 26 is driven in disc radial direction by a step motor 30, a reproduced output is fed to a video signal process in a circuit 36 and fed to a controller 60 through an envelope wave detection circuit 38. The controller 60 fetches the output of a switch 125 detecting that the head 26 reaches the position HP, decides the recording/ unrecording of the picture data at reproduction and when the final recording track is detected, the head 26 is moved to the position HP. When the switch 125 is detected, the head 26 is moved to the track No.1 to attain automatic display.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a rotating magnetic recording/reproducing apparatus, and particularly to a rotating magnetic i8 recording/reproducing apparatus for reproducing information recorded 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 imaging devices 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 pictures of the subject purely electronically and rotate the disk. An electronic still camera system has been developed in which images are reproduced using a separate television system, system, printer, etc.

However, such recording media used for magnetic recording,
In particular, magnetic disks are prone to tracking defects due to anisotropy, eccentricity, thermal expansion, etc. Therefore, during playback, tracks adjacent to the intended track are scanned, causing crosstalk. be.

In order to avoid this problem, there is a method in which tracking servo is applied during recording of information to record a track knocking signal, and this tracking signal is used to apply tracking servo 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 band method or FM azimuth method as the recording method, and to prevent some tracking failures during playback, to prevent the playback head from scanning the adjacent track, or to prevent the signal from 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 by a stepping 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 its 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 disk with a diameter of about 50 m1, that is, the track width is about 50 to 60 μm, and the gird band width is about 50 to 4 μm.
Fifty tracks are recorded at approximately 0 μ-. In a recording or reproducing device, this magnetic disk is
It rotates at a constant speed of 0 rotations, 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, each disk puncture is loaded into the loading position of the recording or reproducing device, and recording or reproducing is performed by rotating the magnetic disk while it is housed in the disk pack.

By the way, when reproducing an image recorded on a magnetic disk using such a rotating magnetic recording/reproducing device, the magnetic head reads the image from the first track (hereinafter referred to as the first track) on which image data is recorded on the magnetic disk. Automatic projection would be possible and convenient if the recorded images on each track were sequentially played back and transferred to the last track where data is recorded, and then automatically returned to the first track after the last recorded image was played. be.

In this case, if the magnetic head is moved to the final track even though no recording has been made to the final track, and then returned to the first track, the reproducing operation will also be performed on unrecorded tracks, which is wasteful.

Further, as described above, when an image is reproduced on a display device when returning the magnetic head from the last track in the recording state to the first track, there is a problem in that the screen is irregularly distorted, giving a feeling of discomfort to the viewer.

[Purpose of the invention]

The present invention enables automatic projection in which when the magnetic head moves from the first track where image data is recorded to the last track where image data is recorded during playback, it automatically returns to the first track. The purpose of this invention is to provide a rotary magnetic recording/reproducing device.

[Summary of the invention]

In order to achieve the above-mentioned object, Zero invented a rotary magnetic recording and reproducing device that moves the magnetic head in the radial direction of the magnetic disk to reproduce recorded image data, in which the magnetic head is moved in the radial direction of the magnetic disk. a magnetic head driving means for causing the magnetic head to return to its original position;
The detection output of the original return position detection means is taken in, and the recorded or unrecorded state of image data in each track of the magnetic disk is determined based on the detection output of the magnetic head during reproduction, and when the last recorded track is detected. and control means for transporting the magnetic head to the original return position and for outputting a control signal to the magnetic head driving arm for transporting the magnetic head to the first track when the return position detection means operates. It is characterized by this.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the rotary magnetic recording and reproducing apparatus according to the present invention will be described in detail below 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 Figure 1, 1 is a housing, 2 is a power switch, 4 is an eject switch, 5 is a forward switch that forwards the magnetic head, 6 is a reverse switch that moves the magnetic head backwards, and 7 is a magnetic head that is connected to a magnetic disk. This is a track number display switch to indicate which track on the top it is located on. Further, 8 is a warning light consisting of an LED or the like, 9 is a remote control connector, and 102 is a puff cage 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 such as a magnetic disk, for example, is removably mounted on a spindle 14 driven by a force recoil motor 12. In this embodiment, the magnetic disk 10 has a magnetic recording material sheet having a diameter of about 5011 mm, and a plurality of recording tracks, for example, 50 recording tracks are recorded on the recording track 6 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 has a frequency generator 18 that generates an AC frequency signal and is powered 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 a constant speed of revolutions per minute. 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 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 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.
occurs.

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 a constant speed of 600 revolutions/minute, so that the video signal for one track, that is, the FM modulated video signal of one field, is transmitted to the magnetic head 26 every 1 revolution/60 seconds. It will be played from. By being demodulated, this becomes compatible with standard color television systems such as the NTSC system.

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.
This circuit outputs a composite color video signal of the same format to the output terminal 40. The video signal processing circuit has a function of demodulating the video signal from the head 26, extracting the vertical synchronization signal VSYNC from the NTSC format composite color video signal, and supplying it to the control device 60. Further, 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 into such a standard format is not essential to this device, and the processing circuit 36 has a function of extracting a synchronizing signal from the video signal detected by the head 26 and converting this to a terminal under the control of the control device 60. It may also have a function of outputting to 40.

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 voltage corresponding to the detected voltage. This is connected via an envelope amplifier 44 to an analog-to-digital converter (ADC) 46. ADC
46 has a quantization level of 256 in this embodiment, and outputs this to the control device 60 as 8-bit data 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 FWD5 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 FWD5 that moves the head 26 in the opposite direction. The reverse switch 6 is connected to a control device 60. The track number 49 on which the magnetic head is located, sent by the forward switch 5 and the reverse switch 6, is displayed on a display device 48 such as a CRT display by a superimposing device or the like equipped with an oscillator (not shown) connected to the control device 60. Visibly displayed. Track N049 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. 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.

The drive pulses are supplied from a drive circuit 50 consisting of a current amplifier, which generates excitation coil drive pulses for the step motor 30 according to an excitation pattern instructed by the control device 60.

The control device 60 and the servo circuit 20 have a reference oscillator (O20
) 62 generates a reference clock. In this embodiment, the servo circuit 20 has a frequency of 60 Hz, 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 provided with a reference signal of
．． A 58MHz clock is supplied.

FIG. 3 shows a magnetic disk pack 200 used in this embodiment, and this disk pack 200 includes a housing 222 that rotatably accommodates a thin, small-diameter magnetic disk 10 for image signals. have 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, allowing the regulation plate 64 and the magnetic head 26 of the playback device 100 to be brought close to or in contact with the magnetic disk 10. I can do it.

As shown in FIG. 4A, a disk pack 200 containing disks 10 is inserted into its packet 102 for loading into the apparatus 100. As shown in FIG. packet 10
2 removably accommodates and holds the disk pack 200, and is rotatably supported by the housing 1 of the apparatus 100 about a fulcrum 104. Normally biased in the direction opposite to arrow A by biasing means 106, disc back 200 can be removed from packet 102 at the position shown in FIG. 4A.

When the disk back 200 is inserted and the packet 102 is pushed in the direction of the arrow A, the retaining member 108 is interlocked in response to this and is biased in the direction of the arrow Fdc about the fulcrum 110, as shown in FIG. 4B. The arm 112 slides on one side 116 of the rotating arm 112 in the direction of arrow B, and moves to the position indicated by the dotted line 108a.

When you release your hand from the packet 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 %7 group 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 bucket 102 as shown by a dotted line. Therefore, when the packet 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 disc back 200 is not properly inserted into the packet 102, the contacts 124 will not close. The output terminal 132 of the contact 124 is connected to the control device 60 as shown in FIG. 1, so that the control device 60 can detect the presence or absence of the disk bank 200.

Contact 124 thus constitutes the back switch 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 No. 1. There is. Track selection or tracking control is performed based on the reference position, ie, the original return position HP, and the number of tracks, ie, the envelope, as the head moves.

- by counting the number of peaks in the sample. 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 μm, for example, about 96 μm for 23 pulses. At that time, the envelope of the signal read by the magnetic head 26 is detected by the detection circuit 38, and further by the ADC 46.
The signal is converted into a digital signal and input to the control device 60. Therefore, the control device 60 moves the magnetic head 26 by one more 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 of the envelope peak. 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 tracking.

In order to quickly on-track to the normal track position in such hill climbing tracking, it is necessary to move the magnetic head 26 to the original return position H at least before the start of tracking.
It is desirable to return it to P.

FIGS. 6A to 6E are flowcharts showing the processing contents of the control device 60 in accordance with the switch operations of each part in the present invention. (The numbers in parentheses indicate the step numbers or processing routes in the diagram.) 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, by key scan (304), six switches, namely back switch (Pack 5W) I
24, Home position switch (IP, SW) 1
25, Load switch (Load SW) 120,
Forward switch (Fwd SW) 5, reverse switch (Rev SW) 6, and track number switch (Tr No, SW) 7 are scanned with a 1V pulse. In other words, this 1V pulse scans the routine from flow 306 to flow 309 at a period of 1/60 seconds, and
/ The on/off status of the above six keys is grasped every 60 seconds.Next, the warning process when the forward button 5 or reverse button 6 is pressed without attaching the magnetic disk puncture 200 to the main body of the device explain. First, when it is determined in step 308 that the back switch 124 is in the ON state by the key scan starting in step 304, a flag PACKF indicating that the magnetic disk pack 200 is loaded in the packet 102 is set in step 311, and the process proceeds to step 308. 332.

On the other hand, if it is determined in step 30B 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, in which the flag INT indicating that the initial processing has been executed is reset, and then in step 315, the flag PACKF is reset, and the process is shown in FIG. 6B. The process moves to step 344.

If it is determined in step 310 that the flag PACKF has been reset, the process proceeds to step 312, where it is determined whether the home position switch 125 is turned on. When the home position switch 125 is in the OFF state, the head 26
Since the head Z6 has not returned to the original return position (HP position), the head Z6 is sent back toward the home position switch by the head reverse feed (314). 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 turned on (316), and then in step 318 it is determined whether the packet 102 is closed in the normal position, that is, loaded. It is determined whether switch 120 is turned on. 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), it is determined in step 324 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, in step 324, if it is determined that the forward switch 5 or reverse switch 6 is in the on state (328
), the disk motor 12 stops (327), and the rotating magnetic recording/reproducing device issues a warning (330). flow 328
The logical state of each switch in is as follows. (Hereinafter, the warning processing is similarly described in sequence in FIGS. 6A and 6B.) Various aspects of this warning processing can be considered. 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. As explained above, the magnetic disk pack 2' (jO is
Forward switch 5 when 1, 02 is not loaded
, or when the reverse switch 6 is pressed, a warning is issued, so the magnetic head 26 will not be moved without the magnetic disk pack 200 being inserted.Next, in the rotary magnetic recording/reproducing apparatus according to the present invention, If the magnetic head 26 is located on the same track on the magnetic disk for 18 consecutive minutes, a warning is issued and the magnetic disk 10 is automatically stopped.
Alternatively, the magnetic head 26 is moved out of the recording area. This warning process will be explained. First, in step 332 of FIG. 6A, it is determined that the magnetic head 26 has been playing back the same track for more than 18 consecutive minutes Vt based on whether the 18-minute timer is set to O (3
34), it is determined in step 336 whether the forward switch 5 or the reverse switch 6 is turned on. If it is determined in step 336 that the forward switch 5 or the reverse switch 6 is in the off state (338), the disc motor 12 is stopped or
27), a warning process (330) similar to that described above is performed. 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 resumes the original routine. As described above, according to the rotary magnetic recording/reproducing apparatus according to 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. It won't hurt anything. In this case, instead of automatically stopping the magnetic disk, the magnetic head may be evacuated outside the recording area.

Next, in step 344 of FIG. 6B, packet 1.0
2 is not closed in the normal position (346
), the disk motor 12 remains in a stopped state (32
0).

Further, in step 344, it is determined that the packet 102 is closed in the normal position (34B), and 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 has been reset (354), then in step 356 it is determined whether the home position switch 125 is in the on state. be judged. If it is determined in step 356 that the home position switch 125 is off (3
58), the magnetic head 26 is reversed (360) and moved toward the home position switch 125. Eventually, the magnetic head 26 is located at the home position, and when 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 364.
to move to. 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 indicating a state that initialization processing has been completed is set (366). The flow that set the flag INT is returned to the original routine (36B).
, while steps 352 to 370 of FIG.
Since the processing goes directly to the next key scan, there is no need to execute the initial operation routine at the next key scan. Furthermore, in the rotary magnetic recording/reproducing apparatus according to the present invention, an operation for detecting an unrecorded pack is also performed in step 364 in which an initial tracking operation is performed. That is, if the user of the rotating magnetic recording/reproducing device accidentally inserts an unrecorded pack, the magnetic head 26 searches all tracks, and if it determines that there are no recorded tracks, that is, it determines that the pack is an unrecorded pack, a warning is issued. will be emitted to notify the user that it is an unrecorded pack.

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. ψ The playback time can be increased 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. If it is determined that the forward switch 5 has been pressed continuously, (3
80), the flow returns to the original routine.

If it is determined in step 378 that the forward switch $ is newly turned on (382), then in step 384 it is determined whether the timer counter is 1, that is, one second has been played. timer counter is 1
(386), in this case, the forward switch 5 will be set to the minimum playback time of 1 second no matter how many times it is pressed, and the flow will return to the original routine. . Next, when it is determined that the timer counter is not 1 (38B), one second is subtracted from the secretion value of the timer counter. That is, when the forward switch 5 is pressed anew in the case where the forward time is 5 seconds, the timer counter is cleared by 1 (390), so that the timer time becomes 4 seconds. In this way, the forward switch 5 is decremented by 1 second from the timer counter each time the display switch 7 is pressed while it is in the on state, and when the playback time reaches 1 second (386), 1 second is subtracted from the timer counter as described above. The playback setting time will be repeated in seconds.

Next, without pressing the thumb word switch 5 while the display switch 7 remains on (392), the reverse switch 6 is turned on by the slump 394 (396), and in step 398, the reverse switch 6 is newly turned on. It is determined whether the button is pressed or the button is pressed. If it is determined that the reverse switch is still pressed (400), then 70- is returned 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 count value of the timer counter is 9, that is, whether there is an infinite standstill time. If it is determined in step 404 that there is an infinite pause time (406), the infinite pause time will not change no matter how many times the reverse switch 6 is pressed, and the key scan will return to the original routine. Scan, that's it. Next, in step 404, if it is determined 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, in the case where the timer/counter 5 sets a playback time of 5 seconds, one second is added by pressing the reverse switch 6 once, and the playback time becomes 6 seconds.

When the timer counter reaches 9 by pressing the reverse switch 6 again, the playback time becomes infinite. As explained above, according to the rotating magnetic recording and reproducing apparatus according to the present invention, each time the forward switch 5 is pressed while the display switch 7 is in the ON state, the reproduction time is subtracted by up to 1 second. By pressing the reverse switch 6 a predetermined number of times in the on state, the playback time can be set to 1.
It can be increased by seconds.

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 ( 418
), 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 it is not displayed (422), the 2-second timer is reset (424), and the track 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 have been pressed continuously (430), if the display switch 7 is not in the non-display mode in step 431 (432), the 2 second timer is activated. It is reset (424), then 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 by turning on the forward switch 5 or the reverse switch 6 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 (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), step 4
At 60, it is determined whether the forward switch 5 or the reverse switch 6 has been newly turned on. In step 460, if the on state of 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 started. It is released (466). That is, the timer counter is set to 9, and the timer is cleared at the same time as it is stopped (468). 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 rotary magnetic recording/reproducing apparatus according to the present invention will be explained. First, in step 470 of FIG. 6E, the forward switch 5 or the reverse switch 6 is turned on.
If it is determined that is turned on (472), then in step 474 it is determined whether tracking is in progress. If tracking is in progress, return to the original routine (47
6) If tracking is not in progress, the 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), the luffing operation is performed in step (482).
84), the 1 second timer is reset and the original routine returns. If the forward switch 5 or reverse switch 6 continues to be pressed in step 480 (48B), it is determined in step 490 whether or not the one second timer is zero. If the 1 second timer is not zero (492), the original routine is returned. Further, 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 is stopped in the time counter and at the same time, the 1-second timer is cleared (494).
, then a tracking scan is performed (496). After the tracking operation is completed, track number 49 is set for 2V period, that is, 1
/ Display for 30 seconds. (498). In this way, according to the embodiment, by continuously pressing the forward switch 5 or the reverse switch 6, the screen can be sequentially advanced frame by frame at high speed.
Track number 49 is displayed for a period of time (1/30 seconds), and the desired 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).

7A to 7E are flowcharts showing the contents of the subroutine of the control device 60 in the embodiment of the present invention.

Here, Figures 6A and 6B center around the state of each key read by the key scan performed in one cycle.
This is a flowchart explaining what kind of interrupt is generated by each key.
Figures A to 7E explain the functions of the apparatus, focusing on the operation of the apparatus, and flags and the like in the flow are only used for convenience.

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

Power switch 2 is on or load switch 12
0 is turned on (500), the control device 6o outputs the signal MUTE to the video signal processing circuit 36 in step 501, and no video signal is output from the video signal processing circuit 36 to the display device 48 (this is not done in this embodiment). In the example, this is referred to as a muting operation.) Next, in step 502, it is determined whether the display switch is on. When the power switch 2 or the load switch 120 and the 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). step 50
2, when the display switch 7 is not turned on (508), the normal mode is set (510), and the number display is a relative address (i.e., only the number of recorded tracks is counted, and the address is assigned to this track. ) is displayed. The operation up to this point is step 300 in Figure 6A.
corresponds to a reset. Next, the ram is cleared (512
), the previously stored memory will be cleared. Next, a key scan (5
14), and it is determined whether the home position switch 125 is in the on state (516). The following actions are in 6th B.
This corresponds to the initial tracking and unrecorded bank detection operations that require interruption from step 352 in the figure. If the home position switch 125 is not in the on state (51
8), [Move the air head 26 one unit (100 μl) in the opposite direction. This operation is repeated until the home position switch 125 is turned on. When the home position switch 125 is turned on (524),
52 to move the 6 m head 26 by a predetermined distance in the forward direction.
6), the number of head movement distances is counted (528), and in step 530 it is determined whether the head has moved 60 track widths from the home position. In step 530, if the movement has not moved by 60 tracks from the home position, read the A/D value of the envelope detection output (
536), and it is further determined in step 538 whether the A/D value is greater than or equal to a predetermined value. If the A/D value is less than the predetermined value (540), it means that the head 26 has not moved to the first recording track, so the head 26 is moved in the forward direction again (526). The operation is repeated until the A/D value reaches a predetermined value, that is, until the first recording track is reached. 60 in this operation
If the track width has moved (532), it is determined that the pack is unrecorded, a warning is given, and the movement of the magnetic head 26 is stopped (534). When the A/D value exceeds a predetermined value in step 538, the muting operation is stopped.
1), then 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). Furthermore, 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, number one in the initial operation
You can find the truck.

The above is the explanation of the initial operation.

Next, we will explain the operation of sequentially searching the second and subsequent tracks, and further explain the operation when there is the last recorded track among them, that is, when there are two or more consecutive unrecorded tracks, as shown in Fig. 7C. This will be explained with reference to FIG. 7D. In the embodiment of the present invention, if two or more unrecorded tracks exist in succession, all subsequent tracks are determined to be unrecorded portions, and the track automatically returns to the first track. First, when searching from the first track to the second track, in step 548
It is determined whether the forward switch 5 is turned on or not, and if it is turned on, the track number display is turned off (550).Next, in step 552, it is determined whether the track number display is 50 or more. . If the track number display is 50 or more, it means the last track, and the skip number A, which will be described later, automatically returns to the first track. 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, step 5
At step 56, it is determined whether the no-record flag is 1 or not. This no-recording flag is a flag that indicates whether the track tracked in the previous operation was an unrecorded track, and when the no-recording flag is 1, the track number is not added when moving to the next tracking operation. , is used to count only recorded tracks. Since the no-recording flag was set to zero in step 542 of the search operation for track N01, the no-recording flag is not 1. Therefore, 1 is added to the track number, and the number of head movement distances counted from the home position is Add 1 to (560),! The air head 26 has a pulse width of 24 (
100 μm) moves in the forward direction 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 6 has been pressed, the track number switch 7 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, it is determined in step 572 whether the no-record flag is 1 or not, and if the no-record flag is zero, 1 is subtracted from the track number display (574), and the head travel distance from the home position. The number is subtracted by 1 (576). Next, the magnetic head 26 is set to 24 pulse width (
578) The A/D value of the envelope detection output is read (5
80).

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 or equal to a predetermined value. , if the AZD value is greater than a predetermined value, perform a tracking operation with the mountain climbing servo (584);
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, whether it continues to be pressed for one second. If it is not the search mode, it is determined in step 588 whether it is the display mode or not, and if it is the display mode, the track number is displayed for only 2 seconds (590). Next, the program returns to step 548 again using the jump 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 58
If it is determined that the search mode is in step 6 (
592), track number display for 2v period (1/30
Move the Rad 26 to the magnetic field while displaying only seconds (59 seconds).
4).

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 it is not the special mode (600), it is determined in step 602 whether the no-record flag is 1 or not. As mentioned above, since the no-record flag is set to zero, it is determined that the no-record flag is not 1 (6
04), then set the no record flag to 1 here (6
06). 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 head movement distance measured from the home position is 60 or more. If the number of head movement distances is not 60 or more (612), step 614
In this step, it is determined whether or not to forward feed. Step 6
If it is determined that forward sending is required in step 14 (616)
, continues to jump number 0, then again step 552
In this step, 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. As mentioned above, since the no record flag is set to 1 (606), the no record flag is determined to be 1 at step 556 (618), and the addition of 1 to the rank number display (558) 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 above a predetermined value in step 582, it is determined that there is only one unrecorded track, and the tracking operation and track number display are performed in steps 584 and thereafter. Here, if the A/D value is not greater than a predetermined value and the special mode is not (582, 600), then the skip number @ is followed, and in step 602 it is determined whether the no-record flag is 1 or not. As mentioned above, since the no record flag is set to 1, the no record flag is determined to be 1 (62
0), then in step 622 it is determined whether the moving direction is forward.

Since the movement direction is set to forward, flow 6
24, the moving direction force 5 is switched from forward to reverse (626). Thereafter, in step 614, it is determined whether or not the moving direction is forward, and as described above, since the moving direction is set to reverse, the process proceeds to step 650.
In step 650, it is determined whether the search mode is set, that is, whether the forward switch 5 or reverse switch 6 is kept pressed for one second or more. If it is determined that the search mode is in step 650, the number of head movement distances is set to 61 in step 652, and the process returns to the interlace number [phase] and repeats the processing from step 570 onwards.

On the other hand, if it is determined in step 650 that the search mode is not set, the track number display is set to aO'', then the muting operation is started in step 660, and the process returns to step 514 in FIG. 7A.Step 5
After the key scan is performed in step 14, it is determined in step 516 whether or not the home position switch 125 is in the on state, and if the switch 125 is in the off state, the magnetic head 26 is moved by one unit length (100 μm) and vice versa. direction and returns to step 514. In this way, the magnetic head 26 is transferred to the home position of the magnetic disk.
, the same process up to L (step 514→516-520-
514) is repeated.

After the magnetic head 26 is transported to the home position, it is further transported to the first track where the image data is recorded by the processing from steps 526 to 542 described above.

In this embodiment, when the track number reaches "5o" (55
2) Returning to step 514, the magnetic head 26 is configured to be transported back to the first track by the processing of steps 514-542.

Also, if the forward switch is pressed when the number of head movement distances reaches "60", or if the track number
If the reverse switch 6 is pressed when the value reaches "1", a warning process is performed (642).

As explained above, in this embodiment, when the last recorded track is detected during playback, for example, when there are two consecutive unrecorded tracks, either timer playback or normal manual playback (by one press of the forward switch) Regardless of the method in which the magnetic head is moved sequentially, it is configured to automatically return to the first track, making automatic projection possible and furthermore enabling efficient reproduction of images recorded on the magnetic disk. can.

Also, if the last recording track is detected, for example,
When there are two consecutive recording tracks, the detection output of the magnetic head or the output of the video signal based on the detection output to the reproduction system is cut off until the first track is returned, so that no video is displayed on the display screen. It does not cause any discomfort to the caregiver.

〔Effect of the invention〕

As explained above, in the rotating magnetic recording device according to the present invention, when reproducing an image recorded on a magnetic disk, it is determined whether the image data is recorded or unrecorded in each track of the magnetic disk, and the final recorded state is determined. When a track is detected, the magnetic head is returned to the first track in the recording state, so that automatic projection is possible and the reproduction operation can be carried out more efficiently.

[Brief explanation of the drawing]

FIG. 1 is an external configuration diagram of a rotating magnetic recording device according to the present invention;
FIG. 2 is a block diagram showing the circuit configuration of a rotating magnetic recording device according to the present invention, FIG. 3 is a perspective view showing an example of a magnetic disk pack that can be used in the device shown in FIG. 1, and FIGS. 4A and 4B. 5 is an explanatory diagram showing the disk bank loading section of this device, FIG. 5 is an explanatory diagram showing the track arrangement on a magnetic disk applicable to this device, and FIGS.
A flowchart showing an example of the operation flow of the control device shown in the figure, and FIGS. 7A to 7E are flowcharts showing the contents of a subroutine of the control device. 80...Remote controller, 82...Photo-Fp97, 84...Reverse button, 86
...Display button, 88...LED, 90...
・Playback time setting knob, 92... Button for automatic forward (A, FWD), 94... Button for automatic forward (A, REV), 96
．． 98 - LED, 100... Still (STI)
LL) button, 124...back switch,
125... Home position switch.

Claims (1)

[Scope of Claims] A rotating magnetic recording and reproducing device that reproduces recorded image data by moving a magnetic head in the radial direction of a magnetic disk, comprising: a magnetic head driving means that moves the magnetic head in the radial direction of the magnetic disk; , a return position detection means that operates when the magnetic head is transferred to the return position on the magnetic disk; and a detection output of the return position detection means, and detects the position of the magnetic disk based on the detection output of the magnetic head during playback. It is determined whether the image data is recorded or not recorded on each track, and when the last recording track is detected, the magnetic head is moved to the original position, and when the original position detection means is activated, the magnetic head is moved to the original position. A rotary magnetic recording/reproducing apparatus comprising: a control means for outputting a control signal to the magnetic head driving means for moving the magnetic head up to one track.