JPS60253071A - Rotary magnetic recording body device - Google Patents

Abstract

PURPOSE:To obtain a rotary magnetic recording body device which can start quickly a selection of a track by constituting a control means so that a distance which is equal substantially to a track pitch is set as a unit and a magnetic head is moved, when resetting the magnetic head to a reference position. CONSTITUTION:When an arm 328 abuts on a switch 324 in the course of shifting a head, and it is operated, a control device 60 detects a closed state of a contact 330 by a key scan which arrives in the next time. Therefore, if 24 pulses of one group are being sent out to a step-motor 30 in that case, a driving circuit 50 drives the motor 30 continuously until it is ended to send out said pulses. When it is ended to send out 24 pulses of one group, a magnetic head 26 is reset to the vicinity of the original position, and in that case, the control device 60 clears a counter for counting the number of tracks to ''0''. Therefore, the control is ended by passing out of a loop, and shifted to the next operation, for instance, such an operation as a selection of a desired track, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating magnetic recording device, and particularly to a rotating magnetic recording device that reproduces information recorded on a rotating magnetic recording device such as a magnetic disk or a magnetic drum. In particular, the present invention relates to a rotating magnetic recording device that rewrites information recorded on a track formed in a circular shape on a magnetic disk while applying tracking servo.

Recently, it has been possible to capture the subject in pure electric still mode by combining an imaging device such as a solid-state image sensor or an image pickup tube with a recording device that uses a magnetic disk, which is inexpensive and has a relatively large storage capacity, as a recording medium. An electronic still camera system has been developed that takes pictures, records them on a rotating disk, and performs +Q production of the images using a separate television station or printer.

However, recording media used for such magnetic recording, especially magnetic disks, are prone to track and king defects due to anisotropy, eccentricity, heat exchange, etc. Therefore, when playing back, it is difficult for the recording medium to be placed in the desired trunk during playback. There is a problem in that scanning of adjacent trunks causes errors.

To avoid this problem, when recording the +/i report,
Apply the king servo and record the trunking signal, pf
For cattle, there is a system that uses this tiger/king signal to apply a trunking servo. First, small, lightweight recording devices such as cameras require close control.
It is not realistic to provide a King Saho mechanism.

Therefore, one of the methods is to use the cart hent force type or FM unmasking type as the recording method, and to avoid scanning the 1'\ throat during playback. Alternatively, there is a method of compensating by not picking up signals from adjacent tracks even when scanning.

Along with this, a so-called mountain climbing method is also used.

This means that during recording, the trunking servo is not applied and the recording is performed at a specified trunk pinch by the stamping motor, and at fQ 11, the envelope of the output signal of each trunk is detected and its peak 4! Tracking servo is applied by identifying the optimal trunk based on the location.

In a rotating magnetic recording medium used in a 1-series still camera system, for example, a small disk with a diameter of about 50+++ m has a trunk pitch of about 100 μm, that is, a track width of about 50 to BOgm, and a guard punt width of about 50 to 50 m. Approximately 40 μl records 50 trunks. In a recording or reproducing apparatus, this magnetic disk rotates at a constant speed of, for example, 3,800 revolutions per minute, and video signals are recorded or reproduced at a field or frame rate.

Such thin, small-diameter compact magnetic disks are usually handled while being housed in a molded pancage such as plastic. That is, the magnetic disk is loaded into a loading device of a recording or reproducing device, also known as a pancage, and recording or reproducing is performed by rotating the magnetic disk while housed in the pancage.

+li '11, I'll get the right 91 tigers as soon as possible.
In order to make this selection, it is necessary to accurately identify each truck (number). In order to do this, it is necessary to put a ton of water into the device. /1 In the confrontation period, it is necessary to quickly return 7to to magnetism by placing ノ, (PeI! 似 or original return (ze (Ho 1, position)).

Normally, this standard is the outermost track of the magnetic disk.
・1 at every position on Rika or one further outside:
Q'JIT is done.

This original return position is realistically detected by a mechanical position detection mechanism such as a limit or tosswitch. However, for example, mechanical position detection such as a leaf switch 4j
With only 1st complement, the detection accuracy is quite low (174 degrees), so based on this, we can detect the desired 1st and 1st curve, and use the high positional accuracy that is cheaply produced by the small-diameter magnetic disk as mentioned above. To start the king, it takes a long time to move R1, which is not appropriate.

(1) In view of these demands, it is an object of the present invention to provide a rotating magnetic recording device that can quickly start track selection.

According to the present invention, a rotating magnetic recording medium is provided with data from a plurality of trunks formed by a predetermined track pinch on a trajectory such that the relative (S) positions of the recording start and end coincide with each other. a magnetic vent for reading the direction of the track; a head moving means for movably supporting the magnetic head; and a control means for controlling the vent moving means to move the magnetic vent to a desired position on the track for tracking. The rotating magnetic recording device includes:

2i detection means disposed near a reference position device serving as a reference for movement of the magnetic vent with respect to the rotating magnetic recording body, and generating a first signal in response to arrival of the magnetic head near the reference position; The control means is magnetic.

When returning the head to the reference position, move the magnetic head in units of distance substantially equal to the trunk pinch,
When the first signal is generated, if a unit of distance is being moved at the time, it is completed and the magnetic vent is stopped.

By the way, in this specification, "relative position t between the start and end of a record"
Multiple tigers formed with trajectories that coincide with each other,
For example, in a magnetic disk, a concentric inner plate is formed around the rotation axis! In a magnetic tram, a large number of tracks are formed parallel to the circumferential force surface, and one track is formed without changing the relative position of the recording vent with respect to one revolution of the magnetic recording body. An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the apparatus of this embodiment, a rotating shaft 10, such as a magnetic disk, is removably attached to a spindle 14 driven by a DC motor 12. As shown in FIG.

In this embodiment, the magnetic disk 10 has a magnetic recording material notebook with a diameter of about 50 mm, and a plurality of recording trunks, for example, 50 recording trunks, are arranged in a concentric circle 1. For example, it is recorded at a pitch of about 100 g. The signal recorded on the recording trunk is a video signal in this embodiment, which may be, for example, a luminance signal and a chromatized or FM modulated color video signal. This video signal is, for example, a field video signal forming one field of an image or is recorded onto one trunk by rask scanning.

The DC motor 12 has a frequency generator 18 that generates an AC frequency signal, is supplied with power by a servo circuit 20, and rotates the disk 10 at a predetermined rotational speed, e.g.
It is servo controlled to rotate at a constant speed of 0 revolutions/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 the signal old SK.

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 at a predetermined position on the recording surface 16 is detected, and a timing pulse PG is formed.

A magnetic transducer or magnetic head 26 is disposed at 1- of the recording surface 16, and this is attached to the support mechanism 28 at 4+!
held. This support mechanism is driven by a stem motor (PM) 30, as shown schematically by a dotted line 28, to move the plate 26 in both radial directions along the recording surface 16, as indicated by arrow R. +r+i l
61- is configured so that the track of the niece or nephew can be selected.

The magnet 26 may have a magnetic recording function; in this embodiment, it detects the video signal from the trunk already recorded on the recording surface 1B and converts it into the corresponding 'IE signal'. An example is shown that has a playback function for converting. As mentioned above, in this example, the disk rotates at 10 or 3,600 rpm.
Since it rotates at a constant speed of 1,760 seconds per rotation, one truck's worth of video No. 18, that is, the FM change iA video signal of the L field, is reproduced from the magnetic head 26. By being demodulated, this becomes compatible with standard color television systems such as the NTSC power system.

A reproduction output 32 of the magnetic head 26 is connected through a preamplifier 34 to a video signal processing circuit 36 and an envelope detection circuit 38. The video signal processing circuit 36 processes the video signal detected by the head 26, for example, N
This circuit outputs a TSC formant composite color video signal to the device output 4o. This is demodulated and NTS
It has a function of extracting a vertical synchronizing signal VSYNC from a C format composite color video signal and supplying it to the control device 60. Further, upon receiving the signal MUTE from the control device 80, the effective water V scanning period of the video signal is set as a blank signal, and a mute ink operation is performed. The function to be converted to such a standard formant is not essential for this device, and the processing circuit 36 is the end of the synchronization extraction function from the video signal sense with the head 26 and the control of the control device 6O. 1
It may also have a function of outputting to '40.

The envelope detection circuit 38 is located on the recording surface 16.

This is a detection circuit that detects the envelope of the modulated video signal recorded in F and outputs a voltage corresponding to the envelope to the output 42. This is connected via an envelope amplifier 44 to an analog-to-digital converter (ADC) 48. In this embodiment, the 80C48 monitors the quantification level of 256, and outputs this to the control device 60 as data of 8 hints in accordance with the value of the control device Go.

The control device 60 is a control device; y1 that centralizes the control of the entire device according to the operations of the operator, as will be described in detail later. configured.

In this embodiment, ++s is used to start and stop the device.
1 + key PL, head 26 in the forward direction of the trunk number (
For example, a forward key FW for transferring the door 26 from the outer truck to the inner trunk) and a reverse key RV for transferring the door 26 in the opposite direction are provided, and these are connected to the control device 60. .

The trunk number specified by the key FW and RV is.

Of course, it may also have a function of audibly displaying an alarm or the like, which is visually displayed on a large or small device 48, such as a light emitting display or a CRT display, connected to the control device 6o.

In this embodiment, the step motor 30 is a four-phase drive pulse operation motor, and responds to one drive pulse to
° It is something that rotates. Therefore, it makes one rotation with 24 pulses. The head support mechanism 28 moves the head 26 in the direction of the arrow R by approximately 4.5 mm using the l pulse supplied to the step motor 30.
It is configured to transfer 2μI. The excitation time for one pulse is, for example, about 2 to 3 milliseconds. Thus, in 24 pulses the head 26 is transported by approximately +00 (rm).

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 are connected to a reference oscillator (O).
SC) Respond to the reference claw 2 generated by 82. In this embodiment, the servo circuit 20 receives the field frequency of the rask scanning video signal recorded on the magnetic disk 1O and a reference signal of 80 Hz, and the control device 601 receives a high speed signal, for example, 3.0 Hz. '58M) Iz clock is supplied.

Referring to FIG. 2, the magnetic disk pancage 200 used in this embodiment has an i do. Almost in the center is a circular opening c1
22B are provided, and the hub or core 212 at the center of the magnetic disk 10 can be exposed from them. A magnetic body 214 that excites the coil 22 of the phase generator is formed in a part of the core 212 .

When the package 200 is attached to the video production device 100, the tip of the spindle 14 chunks into the core 212, allowing the magnetic disk 10 to rotate within the package 200.

In the pan cage 2001, as shown by an arrow 228, one of the packages 200 is provided with a shutter 230 that is movable in the direction of the contents. When this Nyanota 230 is moved to the opposite position from that shown in the figure, the national polity 230 at that position
2 opening is exposed, +j+regulating plate 64 of raw device 60
And the magnetic head 2G can be brought into contact with the magnetic disk 10.

As shown in FIG. 3A, the pancage 200 containing the disk IO is inserted into its inner packet +02 for loading into the apparatus. inner packet 10
2 accommodates and holds a removable pan cage 200, and is supported rotatably about a fulcrum 104 on the body of the apparatus. Normally, the biasing means 10f biases the pan cage 200 by +1 in the direction opposite to the arrow A, and the pan cage 200 can be removed from the opening 102 at the position shown in FIG. 3A.

Insert the pan cage 200/-ken)+02 to arrow A
When pushed in the direction of the chisel, the engaging member 108 is interlocked in response to this, and the support is biased and rotated in the direction of the arrow C about the support 110, as shown in FIG. 3B. 112 in the direction of arrow B, and move to the 1st position of line 108a. Then, when the knife is released from 102, the sealing pressure of force means 106 causes 7<key 10.
2 or 11- is set at the loading position of the worm, and the 4. of the retaining groove 114 at the tip of the retaining member + l is also received and engaged therewith. At this time, disk 1
The spindle 14 is chucked to the core 2+2 of 0.

In this state, the pressing portion 120 at the other end of arm 1+12 presses the protrusion 128 of the normally open contact 120 to close it. In other words, the contact point +20 is configured to close in a twisted manner in the 814 collapse state of /(ke,)102 or 1. Contact=! The output terminal r130 of the J, 120 is connected to the control JA device 60 as shown in FIG. 1, and the control device 60 can thereby detect whether the Bangu 7200 or 11 is always loaded.

// Also, 18 pieces, ) At the bottom of +02, there is an open ``J122'' as shown by the dotted line.
102 or II standard loading position, the normally open contact 12
The protrusion 128 of No. 4 enters the opening 122 and abuts against the pan cage 200, so that it is pushed and closes the abutment 124. Package 200 is inner packet 102
If it is not inserted in the +E condition, contact 124
is not closed. Output terminal +32 of contact +24 is fjS
As shown in FIG. 1, it is connected to a control device 60, which allows the control device 60 to detect the presence or absence of the package 200.

As shown in FIG.
00, and this output stage engages sector gear 302. A pulley 304 that rotates integrally with the fan-shaped float 302 is attached to it, and one point of the wire 30B is fixed to it by a tightening step 30G. wire 308
Both ends of the head carriage 314 are secured to the sides 316 of the head carriage 314 by fastening means 310 and 312. The magnetic head 26 is supported on the hair carrier 314,
With this configuration, the henotocarryin 314 can be operated by the motor 3.
The guide rod 318 can be slid in the direction of the arrow R in response to the drive of the guide rod 318.

When the magnetic disk 10 housed in the pancage 222 is installed in the unequipped device 100, its core 212 engages with the spindle 14, and the vent 26 is inserted into the disk 10.
is transported in the direction R of . The outermost part of the transfer path is the fifth
Although the position shown in the figure is
41 is detected by the limit, tosui, and chi 324 arranged on the fixed member 322. That is, sector tooth Φ
, 302 is provided with an arc L, 328 protruding from the circular portion 326 of the magnetic vent 26, and the magnetic vent 26 is located at approximately the outermost position of its transfer stroke, that is, the Ir; )IIP (FIG. 4), it comes into contact with the moving member of the A/I switch 324, which is pushed back and its contact 330 (FIG. 1) is closed.

In this embodiment, as shown in FIG. 4, the tracks 7 of the magnetic disk 16 are arranged from the smallest number to the seventh number from the outside toward the center, and the return position NPH of the magnetic head 26 is as follows.
It is set to be located further outside than the outermost trunk 111. Trunk selection or tracking control is performed by counting the number of trunks, ie, the number of envelope peaks, as the head moves, with this reference position, ie, the original return position IP, as a reference.

Tracking by hill-climbing control is performed as follows. First, it is assumed that the magnetic vent 26 is already located at the top of a certain track. When the key FW or RV is operated, the control device 60 controls the step motor 30 by the drive circuit 50.
is activated to move the magnetic head 26 in the forward or reverse direction.

The magnetic head 26, in this example, is first transported in the forward or reverse direction over a distance of slightly less than 100 μm of intertruncal pinch, eg, 23 pulses, about 96 degrees. At this time, the envelope of the signal read by the magnetic head 26 is detected by a detection circuit 38, and inputted from the ADC 4G to a control device 60 in the form of digital data. Therefore, the control device 60 further controls the number of pulses for one pulse.
6, and the level of the envelope of the signal detected from the magnetic head 26 at that time is compared with that of the previous envelope.

In this way, without transferring the vent 26, the control device w80
Detect and compare envelope levels each time.

Determine the misalignment that is the peak of the envelope. The vent position where this peak was detected is 1F on that track.
This is a position that is close to the trunk. In this manner, the control device GO performs mountain climbing re-drinking.

In such a mountain climbing retrunk, in order to quickly move to the proper position, the magnetic field should be adjusted at least before the start of trunking.

It is preferable to return the magnetic vent 26 to its original position (<7-position HP). Therefore, the control device 60 returns the magnetic vent 26 to its original position IP according to the operation flow shown in FIG. Recover quickly.

This operation will be explained with reference to the timing chart shown in FIG. This control flow is activated in response to whether the power is turned on to this device or whether the inner bag NO2 into which the magnetic disk package 200 is loaded is opened (
400). As shown in FIG. 7, for example, when the power is turned on at time tl, or when the control device Go detects that the switch +20 is opened and the switch 102 is opened, the control device 60 initializes the system. do it (
402).

Therefore, the reference clock is output from the reference generator 62 to the control device B6.
0, and the control device w8o starts reading the key scan ((B)). This scans and captures the state of the signal manually input to the control device ff160. In this embodiment, the image signal recorded on the magnetic disk IG by rask scanning is scanned every 1@direct scanning interval (IV). That is, it is performed at field frequency. Therefore, the control device 6o
When the system is stabilized (time t2), the power indicator lamp or light emitting light is turned on, and the signal MUTE is turned on to prevent No. 48 from the magnetic vent 26 from being output to the output terminal 4o (time (C)). .

Until then, the air vent 26 is generally connected to the trunk of a trunk (
located on the master device. Therefore, in order to return the magnetic hent 26 to its original state with this initial setting, at the same time, the step motor 30 is activated via the drive circuit 50.
Only for 24 pulses or 100 μm.

26 in the opposite direction, radially toward the outermost direction (408).

Therefore, the control device 60 performs a key scan 404 at 11f.
The state of the switch 330 is monitored by performing the following steps. As a result of monitoring, if the switch 330 is not closed, that is, the star-shaped tooth +302 shown in FIG.
Then, the vent 26 is further moved by 24 pulses, that is, longm (408). Thus, the seventh
As shown in Figure (D), 24 pulses or 100
After transferring the gm to the middle position of gm, the condition of the switch 330 is monitored and the gm 26 is transferred toward the original restoration device HP.

Thus, to the magnetism, G26 is transferred to Trunkbi, C'J,
'Qualitatively equal distances, i.e. 100 g in this example
Plows are transported in the opposite direction. As will be clear from the following explanation, by moving the magnetic head 26 in the opposite direction at the midpoint of the center, the tracking control by forward movement after the magnetic head 26 returns to its original position HP is quickly resolved. This is to make it possible to do so. Note that this transfer rank does not have to be in units of tigers and pinches, but may be in units of an integral number thereof.

In this manner, when the arm 328 contacts the switch 324 and operates the switch 324 at time t3, the control device N60 is moved to the switch 330 by the key scan 500 that comes next after t3. Detects the open state of. Therefore, if the drive circuit 50 is sending out a group of 24 Hals to the spun motor 30 at that time, it continues to drive the motor 30 until it sends out and spins this group. When the transmission of one group of 24 pulses is completed, the magnetic head 26 has returned to the vicinity of the original position IP. Control device 60
At that time, the counter that counts the number of trunks to 41 is cleared to O. Control then exits the loop including steps 404 through 408 and proceeds to the next operation, such as selecting a desired rank.

In this way, near the original return position HP, Zeng' It:
1 - The magnetic vent 26 is connected to a certain trunk by an integer multiple of &l
Only the IM returned in the opposite direction (it is in the wrong place. 1- Therefore, the rotating magnetic disk 16 or wooden,?! + If the device is installed, or the magnetic disk with the image recorded in the rotating lot. As long as the 16 is loaded, if you move the magnetic head [26 in the forward direction from the second position to the middle position, it should be almost on track to the track I+1 or the desired track. be.

Therefore, as described in iii+, when the key FW is operated, the control device 60 responds to this by returning to the original position kt.
+i'i From IIP; rank pinch as medium (transfer head 26 as Q, 1 taken out from head 26
If the entrainment lobe of No. 5 is detected, it is possible to quickly reach the position t1 near the peak of the entrainment rope of the first trunk full. In this way, it's almost online.

The above-mentioned mountain climbing trekking is carried out in a relaxed state.

Does the present invention restore magnetism to its original state? When returning to the device, the head is moved in the opposite direction in units of a distance substantially equal to an integer fraction of track pinch or l'i, and the intermediate movement of l is completed by detecting the original return position.
Therefore, when the next track is selected, the track can be quickly stopped. link selection can be started.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the rotating magnetic recording medium device according to the present invention. FIG. 21Δ is a perspective view showing an example of a magnetic disk package that can be used in the device shown in FIG. FIG. 3B is an explanatory diagram showing the cage loading section of this device. FIG. 4 is an explanatory diagram showing the track arrangement on a magnetic disk that can be applied to this device. FIG. FIG. 6 is a plan view showing the mechanical configuration of the embodiment of the device; FIG. 6 is a flow-1 diagram showing an example of the operation flow of the control device in the embodiment shown in FIG. FIG. 6 is a timing diagram showing the operation timing of the control device in Example I. 10, magnetic disk 12 spindle motor 26 magnetic disk 28 Ghent transfer machine Tachibana 60, control device 102, inner~Kent+20 package loading completion detection switch 124 Pan cage detection switch 324 Return to original position (? position detection switch 330, return position detection switch contact t, :?, Fig. 2 Fig. 4 Mr. pull 54 484950 Fig. 3A Fig. 38 Fig. 5 ↓

Claims (1)

[Scope of Claims] 1. A magnetic hand that reads signals from a plurality of trunks formed at a predetermined trunk pitch on a trajectory such that the relative positions of the start and end of recording coincide with each other on a rotating magnetic recording body; A head moving stage for movably supporting the magnetic hent; and a control means for controlling the head moving stage to move the magnetic hent to a desired attachment point among the trunks to perform trunking. In the rotating magnetic recording body device, the device is disposed near a reference position that serves as a reference for the movement of the magnetic head j with respect to the rotating magnetic recording body, and the reference a) device 4 = J of the magnetic head. In response to the arrival of the near, the first faith 1
Start the ¥1. The control stage includes a first detection stage for returning the magnetic head to the reference position by setting the trunk pitch to an actual distance Qlj (white). ω Move Dachen 1 and move the 1st
When the signal 1 is generated, if the magnetic head is moving at a medium distance at that time, it is completed and the magnetic head is stopped.
A rotating magnetic recording device characterized in that: 2. In the device according to claim 1, the control stage is configured to adjust the reference value <Q in response to power on to the device.
A rotating magnetic recording device characterized in that it starts control for returning to a position. 3. Particularly, in the apparatus according to claim 1, the apparatus comprises: device 11 in a state in which it is possible to close the co-rotating magnetic recording body to the magnetic field and read signals by I1;
j device and 1L stage and 1, A device, ri i stage opening and 1 cardiac movement 1. and a second detection stage for generating a second signal when the second signal is generated.
(ii) A rotating magnetic recording device characterized by starting control for returning to a quasi-i device.