JPS6251019A - Position adjusting system for magnetic head - Google Patents

Abstract

PURPOSE:To attain an automatic control with the amount of projection, the slanting angle, the center shift, the azimuth shift and the flapping angle which are necessary for the positioning of a magnetic head, by providing plural drive means to move the magnetic head in various directions. CONSTITUTION:The 1st-6th control screws servings as the drive means for the adjustment of positioning of magnetic head 12 are replaced with pulse motors 201-206 respectively. In other words, the head 12 which is held temporarily by the arm of a magnetic head holding means together with a head block via a 6-direction shift means 76 can be moved in the directions Y, Z, X thetaZ, thetaY and thetaX respectively. A CPU 208 contains keys 217, 218, 221, 219, 220, 216 to perform the control and tracking T with the projection amount Ea, the shift amount Ea, the slanting angle thetaa, the azimuth shift thetab and the flapping angle thetac respectively and also controls the means 76 via the motors 201-206.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a magnetic head position adjustment system, and more particularly to a magnetic head position adjustment system used in a magnetic recording or reproducing device such as an electronic camera.

<Background of the invention> Recently, imaging devices such as solid-state imaging devices and image pickup tubes.

In combination with a recording device that uses a magnetic disk, which is inexpensive and has a relatively large storage capacity, as a recording medium, the subject is photographed purely electronically and recorded on a rotating magnetic sheet, and the images are played back by a separate television system. Electronic camera systems have been developed that use cameras and printers.

By the way, this type of magnetic sheet used in electronic cameras and the like differs from the magnetic sheet used in general magnetic recording and reproducing devices, in that it records still images or video information at high density, and rotates at high speed. . Therefore, a magnetic head that contacts a magnetic sheet to perform recording or reproduction on the magnetic sheet must be accurately aligned with respect to the magnetic sheet.

From this point of view, magnetic heads used in electronic cameras, etc., and used for recording or reproducing still image information, etc., have a protrusion j, :0, (■1vi angle, ■center deviation) with respect to the magnetic sheet. , ■ Azimuth deviation, and ■ Tilt angle. Of these, ■ Tilt angle and ■ Tilt angle can be dealt with only by head aging without adjustment if they are minute. These five adjustments will be sequentially explained below with reference to FIGS. 6 to 8.

In FIG. 6, IO is a magnetic sheet, 12 is a magnetic head for recording or reproducing on this magnetic sheet 10, and 14 is
is a regulation plate that is provided at a position facing the magnetic head 12 with the magnetic sheet IO in between, and makes the magnetic sheet 10 follow the magnetic head 12. A magnetic sheet 10 is attached to the magnetic helad 12.
A protrusion amount Ea within a predetermined range is required for the magnetic head, and in order to perform better recording/reproduction and prevent wear of the magnetic head and recording medium.

It is necessary to precisely adjust the position of the seat 12.

In addition, in order to obtain good reproduced images even when the same recording medium is loaded into different playback machines, the recording head and playback head are separated, as in the case where the recorder and playback machine are configured separately. When using a magnetic head I2, the inclination angle Oa as shown in FIG. 6, the deviation IEb and azimuth deviation θb of the magnetic head I2 with respect to the center of the magnetic head
Furthermore, as shown in FIG. 8, the tilt position Oc of the magnetic head relative to the magnetic sheet IO must be within a predetermined compatible range.

Five adjustments are required to determine the position of the magnetic helad 12 in this way, but if you try to incorporate an adjustment mechanism that performs these five adjustments into an electronic camera, the electronic camera will become a large one. It becomes more complex and less portable. Furthermore, if the adjustment mechanism is miniaturized and forcibly incorporated into an electronic camera, the necessary dimensions for the adjustment mechanism cannot be obtained, resulting in a problem that it is difficult to achieve the desired accuracy.

Here, a magnetic sheet pack, which is a recording medium used in this type of technical field, and a recording/reproducing device thereof will be explained.

FIG. 9 is a plan view of a magnetic sheet pack used in a magnetic recording or reproducing device such as an electronic camera, and FIG. 10 is a sectional view taken along line V--V in FIG. 9.

As shown in FIG. 9, the magnetic sheet pack 16 has a substantially rectangular shape, and a magnetic sheet 10 on which still image information and the like are recorded is rotatably housed inside. A center core 20 as a reinforcing member is provided in the center of the magnetic sheet IO, and this center core 20 is exposed to the outside through a circular opening 22 of the magnetic sheet pack 16, and a central core 20 is provided in the opening 22. supported. A window 24 in which a magnetic heald 12 (to be described later) is located is opened in the magnetic sheet pack 16, and this magnetic head window 24 is opened and closed by a slidable shutter 2B. That is, the shutter 26 closes the window 24 to prevent dust from adhering to the magnetic sheet 10 before the magnetic sheet pack 16 is inserted into the inner packet described later, and when the magnetic sheet pack 1B is inserted into the inner packet. The shutter 26 moves downward in FIG. 9 to open the head window 24 and close the magnetic sheet l.
Recording and reproducing to O becomes possible. Further, a 2G bin 23 is embedded in the center core 20 such that its -L end surface is located on the surface of the center core 20. This PG pin 23 is positioned directly below the PG coil (not shown) for each rotation of the magnetic sheet 10, so that the PG pin 23 is connected to the PG coil for each rotation.
Generate a pulse.

FIG. 11 shows a magnetic recording or reproducing device using the magnetic sheet pack 16. As shown in the figure, the magnetic recording or reproducing device includes a chassis 28 and an inner packet 30, h into which the magnetic sheet pack 16 is inserted; a3
It is composed of 2. First, the internal structure of the chassis 28 will be described. A spindle motor 34 for driving a magnetic sheet is disposed in the chassis 28, and when the top cover 32 is closed, the drive shaft 3B of the spindle motor 34 moves to the first θ.
It is fitted into the center hole 21 of the center core 20 of the magnetic sheet pack 16 shown in the figure, and the magnetic sheet IO is rotated at a predetermined number of rotations within the magnetic sheet pack 16. Further, in FIG. 11, numeral 38 is a pulse motor for driving the magnetic helad 12, 40 is a lead screw, 41 is a guide shaft, and 42 is moved by a screw 40 which is screwed into the screw 40. A head carriage 12 is a magnetic head attached to the head carriage 42 via an L-shaped head block 45.

In such a device, when the pulse motor 38 is rotated a predetermined number of revolutions, the head carriage 42 is moved toward the guide shaft 4.
Therefore, the magnetic head 12 is moved in the radial direction of the magnetic sheet 10 (direction A in FIG. 11).
It is possible to record still image information on the magnetic sheet 1O by forming an annular or spiral track, or to reproduce information recorded in this way.

A leaf spring 5 bent into a crank shape is provided on the back side of the upper lid 32.
0.50 are provided at predetermined intervals, and this leaf spring 50.50
A regulating plate holder 52 is attached to.

The regulation plate holder 52 has a length corresponding to substantially the entire width of the chassis 28.

Furthermore, as shown in FIG. 12, the regulating plate holder 52 has a regulating plate 5 at a position facing the magnetic head 12 when the top cover 32 is closed.
4 are provided. The regulation plate 54 has a groove 56 formed in the direction of movement of the magnetic head 12.

On the other hand, on the left side of the chassis 28 in FIG.
is planted, and on the right side there are bins 60 and 62. The receiver is pin 58.60.62 is when 1M32 is closed,
A long hole 53 whose upper surface is provided in the regulation plate holter 52,
It abuts or fits into the holder surface 55 and the round hole 57, and regulates the height of the regulation plate 54 to maintain a predetermined distance from the magnetic heald 12 for accurate positioning.

FIG. 12 shows the relationship between the chassis 28 and the regulation plate 54 as an assembly. As shown in the figure, when the top cover 32 is closed, the regulating plate holder 52 is supported by receiving pins 58, 60, 62 (the receiving pin 60 is not shown). As a result, the regulating plate 54 can be positioned at a predetermined minute distance from the magnetic helad 12.

Incidentally, in a magnetic disk drive, the regulating plate 54 is required to regulate its height with respect to the magnetic helad 12 with extremely high precision. .60.62 is formed with extremely high precision. Also.

The position of the drive shaft 36 relative to the magnetic head 12 is determined with high precision, and therefore the drive shaft 36 is also set at a predetermined position extremely strictly in the chassis 2841.

<Prior art> In order to determine the position of the magnetic helad 12 in the L recording/reproducing device, as described above, with respect to the magnetic sheet IO, ■ protrusion amount, ■ angle of intrusion, ■ center shift, ■ azimuth shift, (2) It is necessary to perform five adjustments of seven orientation angles, and a device for this purpose has also been proposed.

A conventional device of this kind is shown in FIG.

The device shown in this figure uses the drive shaft 36 and pins 58, 80, and 82 shown in FIGS. 11 and 12 as the positioning reference for the chassis 28. That is, the drive shaft 36 is used as a reference center for positioning and adjusting the chassis 28, and the bearing pins 58, 60, and 62 are used as reference heights for positioning and adjusting the chassis 28.

FIG. 13 shows a schematic structure of a magnetic head position adjustment device according to the prior art. As shown in the figure, this position adjustment device has a base 70. A mounting jig 72 that is erected on the base 70 and supports the chassis 28, a magnetic head holding means 74 that attracts and temporarily holds the head block 45 to which the magnetic helad 12 is attached. A large direction moving means 78 that can move the magnetic head holding means 74 in six directions relative to the mounting jig 72, and a relative position of the magnetic head 12 held by the magnetic head holding stage 74 with respect to the chassis 28. It consists of an optical measuring means 78 for measuring the magnetic head and an ultraviolet irradiation device 79 for curing the adhesive for attaching the magnetic head.

First, the mounting jig 72 will be described. The mounting jig 72 is composed of an abbreviated mounting plate 80, and the lower end of this mounting plate 80 is fixed to the base 7Jlz with screws 82. A rectangular opening window 84 is formed in this mounting jig 72, and the magnetic head holding means 74 is positioned in this opening 84 so as to be movable in a large direction. Further, a reference hole 8B is formed in the center of the mounting plate 80, and a rectangular parallelepiped-shaped reference protrusion 8B is provided protruding below the reference hole 8B. The drive shaft 3B on the chassis 28 side is fitted into the reference hole 86, and the reference protrusion 8
8, when the chassis 28 is attached to the mounting plate 80, the lead screw 40 is brought into contact with the chassis 28 to position the chassis 28 in the moving direction of the magnetic head 12. This makes it a magnetic head! 2 passes through the center of the rotating magnetic sheet io (the center of the drive shaft) and can move in the radial direction. Note that the reference protrusion 88 may be brought into contact with the helad carriage 42 to regulate the direction, and the mounting plate 80 is formed with three holes 90 degrees 32 and 94;
．． The pins 58, 60, 62 are fitted into the receivers 94, and the chassis 28 is placed at a predetermined distance from the mounting plate 80 (see FIG. 14).
In the figure, a pin 62 is shown as a receiver, and the surface 63 of this receiver is in contact with the bottom surface of the hole 94 to regulate the height of the chassis. The height is regulated by contacting the mounting plate 80.

Next, the magnetic head holding means 74 will be explained.

Magnetic head holding means? 4 consists of an arm 96 formed in a substantially dogleg shape, and a suction surface 88 is formed at the tip of this arm 3B. An air suction hole 100 is formed in the center of the suction surface 88, and this air suction hole 100 communicates with a suction air passage 102 (see Fig. 14). Therefore, when air is sucked from the passage 102, the head block 45 will be temporarily held on the suction surface 98.

A rubber plate or the like may be attached in advance to this suction surface 98 to prevent air leakage during suction.The magnetic head holding means 74 can be moved minutely in six directions by a large direction moving means 76, which will be described later. can.

Next, the large direction moving means 7B will be explained. First, base 1
04, a first sliding plate lO6 that is movable in the Y direction is slidably supported. The first sliding plate 108 is biased by the spring 108 and can be moved back and forth in the Y direction by rotating the first adjusting screw 110. Further, a second sliding plate 112 formed in an oval shape is supported on the first sliding plate 108-H so as to be slidable in the Z direction. This second sliding plate 112 is biased by a spring 114, and can be moved back and forth in the Z direction by rotating the second adjusting screw 11B. A third sliding plate 11B is attached to the rising surface of the second WIj moving plate 112 so as to be slidable in the X direction. Third sliding plate 11
8 is biased by a spring 120, and the third adjustment screw 1
By rotating 22, it can be moved back and forth in the X direction. The third sliding plate 118 supports a first rotating plate 124 having a substantially oval shape so as to be rotatable in the θZ direction about the shaft 12B. The first rotating plate 124 is urged to rotate about the shaft 12B by a spring 12, and is rotated in the θZ direction by rotating the fourth adjustment screw 130. An abbreviated second rotating plate 134 is supported on the base plate of the first rotating plate 124 via a shaft 132 so as to be freely rotatable in the θY direction. The second rotating plate 134 is the spring 13
8 to rotate around the shaft 132, and can be rotated in the θY direction by rotating the fifth adjustment screw 138. A base end of an arm 96 is attached to the second rotating plate 134 via a shaft +40 so as to be rotatable in the θX direction. Arm 98 is a spring! 42 about the shaft 140, and can be rotated in the θX direction by the sixth adjustment screw 144. Therefore, the suction surface 8B formed at the tip of the arm 96 has the first to sixth adjustment screws 110, 1
By rotating 18, 122, 130, 138, 144, it is possible to move in six directions, namely x, Y, Z, OX, θ.
It can be moved in the Y and OZ directions.

Next, the optical measurement stage 78 will be explained. The measurement-L stage 78 is constituted by an optical WJ microscope. The WJ micromirror has a main body of 148. It consists of an objective section 150 and an eyepiece section +51. The repolver 152 of the objective section 150 includes a normal m microscopic lens 154 and a DI lens 15B for interference microscope.
, a normal lens 154 provided with a mirror 158
, DI lens 158. Mirror 158 is Repolba 1
By rotating the magnetic head 52, it can be placed in a position facing the magnetic head 46 held by the attraction surface 98 of the arm 8B. The focusing positions of the microscope lens 154 and the DI lens 15B are set in advance to be at the height of the magnetic herad 12.

The eyepiece 151 is provided with an image pickup tube (not shown), and the magnetic herad 12 can be displayed and observed on a monitor television or the like.

Furthermore, an ultraviolet irradiation device 79 is provided on the base 70. The ultraviolet rays emitted from the ultraviolet irradiation device 79 are reflected by a mirror 158 set in the direction of the magnetic head 12, and irradiate the area around the magnetic head 12 held by the arm 96 when the magnetic head 12 is bonded. In this case, as shown in FIG. 15, in addition to the mirror 158 attached to the repolver 152, a sub-mirror 160 is provided on the fixed side of the microscope, and the sub-mirror 180 irradiates the part that is not irradiated by the mirror 158. This makes it a magnetic head! 2
The surrounding area can be illuminated without shadows. The ultraviolet rays reflected by the sub-mirror 180 pass through the through hole 162 formed in the arm 98 and irradiate the area around the magnetic head 12 .

The procedure for adjusting the magnetic head adjusting jig device according to the present invention configured as described above is as follows.

(1) First, the head block 45 to which the magnetic helad 12 is attached is attracted and temporarily held by the suction surface 9B at the tip of the arm 88.

(2) Next, the DI lens 15 of the objective section 150 of the microscope
6 to the observation position by rotating the repolver 152.

In this state, using an interference microscope, the first, second, and third
By rotating the adjusting screws 110, 118, and 122, the magnetic head 12 is moved in the Y, Z, and X directions, respectively, and the head gap is roughly aligned with the cross line in the microscopic field of view. is roughly positioned in the x, y, and z directions.

(3) Figure 16 shows the field of view of the interference microscope,
If the gap G of the magnetic head 12 deviates vertically from the center of the interference fringes, a 7-orientation adjustment is required, and if it deviates horizontally, a tilt adjustment is required. That is, 5th. 6th
By rotating the adjustment screws 138 and 144, the magnetic head 12 is rotated in the θY (7 orientation) and OX (tilt) directions, and the center of the interference fringe is aligned with the \rad gap G as shown in Fig. 16. Adjust the inclination and 7 orientation of the combined magnetic head 12.

(4) Next, rotate the repolver 152 again and set the normal microscope lens 154 to the observation position. The inclination from the horizontal cross line Ll in the field of view of the microscope shown in FIG. 12 indicates azimuth deviation, and the deviation of the head gap G from the vertical cross line L2 indicates center deviation.Turn the first adjustment screw 110 while looking at the microscope. The magnetic head 12 is moved in the Y direction by operation, and the fourth adjusting screw 130 is rotated to move the magnetic head 12 in the OZ direction, and these operations cause the head end surface 12A to align with the horizontal cross line. Align it to match Ll. (Alternatively, move the magnetic head 12 in the X direction by rotating the third adjustment screw 122, check the misalignment between the cross vertical line L2 and the head 12 on both end surfaces 128, 128 of the head 12, and then turn the fourth adjustment screw 122.) (130 is rotated to move in the OZ direction for adjustment.) As a result, azimuth adjustment and center deviation: A adjustment are performed.

(5) Next, move the magnetic heald 12 in the X and Y directions to align the center of the head cap G with the cross line in the field of view of the microscope, and move the magnetic heald 12 in the Z direction by operating the second adjustment screw 11B. The magnetic head 12 is moved to a focused position. The focus position of the W4 microscope is set to head 12 in advance.
Since the depth of focus of the microscope is extremely shallow, the protrusion amount jA! I! ! is performed accurately.

(6) After completing the adjustment of the magnetic head 12, apply ultraviolet curing adhesive to the bottom surface of the head roller 45.

(7) In this state, insert the chassis 28 into the reference hole 86, the pin hole 90.92.94, the drive shaft 3B, and the pin 58.69.6.
2 to regulate the centering and height of the chassis 28, and to regulate the direction by aligning the reference protrusion 88 with the lead screw 40.
Attach to. At the time of this attachment, the head block 45 is adhered to the chassis 28.

(8) Next, rotate Repolba 152 and mirror 15B.
into position.

(9) In this state, ultraviolet rays are irradiated from the ultraviolet irradiation device 79 to harden the adhesive.

αa Next, air suction is stopped and the chassis 28 is removed from the suction surface 98.

<Problems to be Solved by the Invention> The device according to the above-mentioned prior art is installed upright on a base and is equipped with a magnetic disk. a mounting jig equipped with a Li body support; a magnetic head holding means for temporarily holding the magnetic head on the magnetic disk drive main body until the magnetic head is fixed to the magnetic disk drive body; Since it has a moving means for moving the magnetic head and a measuring means for measuring the relative position of the magnetic head with respect to the main body of the magnetic disk drive, each adjustment of the protrusion amount, inclination angle, center shift, and 7-orientation of the magnetic head can be performed with high precision. However, all these adjustments had to be made manually, which took a lot of time.

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, an object of the present invention is to provide a magnetic head position adjustment system that can automatically adjust the position and orientation of a magnetic head with respect to a member to which it is attached in a predetermined manner.

<Means for Solving the Problems> The configuration of the present invention that achieves the objective described above has a PG pin that serves as a reference for each revolution, and vertical synchronization in which the recording position with respect to this PG pin is predetermined. A magnetic head holding means for temporarily holding a magnetic head for reproducing the standard signal by contacting a disk-shaped magnetic sheet on which a standard signal, which is a positioning image number 4g having a signal, is recorded; a drive means for moving the magnetic head to the rotational direction side of the magnetic sheet or the opposite side to the rotational direction via the magnetic head holding means in order to adjust the amount of deviation of the magnetic head in the radial direction; A sensor that detects the PG pin and generates a PG pulse every rotation, a vertical synchronizing signal separation circuit that separates the vertical synchronizing signal from the standard signal reproduced by the magnetic head, and a vertical synchronizing signal separating circuit that separates the vertical synchronizing signal from the standard signal reproduced by the magnetic head. It is characterized by comprising a control means for adjusting the position of the magnet by controlling the driving means so that the time up to the input point becomes a predetermined time determined from a predetermined recording position of the vertical synchronization signal with respect to the PG bin. At the same time, it has a PG pin that serves as a reference for each rotation, and a disc-shaped magnetic disk on which a standard signal, which is a positioning video signal, is recorded, and has a vertical synchronization signal whose recording position with respect to the PG bin is predetermined. a magnetic head holding means for temporarily holding a magnetic head that comes into contact with a sheet and reproduces a standard signal; a radial deviation amount of the magnetic head from the center line of the magnetic sheet; an azimuth angle, a tilt angle, and a tilt angle of the magnetic head; a plurality of driving means for moving the magnetic head in each direction via the magnetic head holding means in order to respectively adjust the amount of protrusion of the magnetic head toward the magnetic sheet side; A sensor that detects the PG pin and generates a PG pulse, a vertical synchronization signal separation circuit that separates a vertical synchronization signal from the standard signal reproduced by the magnetic head, and an envelope of the standard signal reproduced by the magnetic head. An envelope detection circuit, a current detector that detects the load current of the spindle motor that rotates the magnetic sheet at a predetermined number of rotations, and a current detector that detects the load current of the spindle motor that rotates the magnetic sheet at a predetermined rotation speed. The drive means is controlled to adjust the amount of deviation so that it becomes a predetermined time from a predetermined recording position, and the envelope value detected by the envelope detection circuit is input, and the azimuth angle and the tilt angle are adjusted so that the envelope value is maximized. and the drive means to adjust the tilt angle, and furthermore, input the load current value of the spindle motor detected by the current detector and adjust the protrusion amount so that the load current value becomes a predetermined setting value. and a control means for controlling the drive means to adjust the position of the magnetic head.

<Example) Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

The unexampled mechanical structure is a driving means for adjusting the position of the magnetic head 12 in the apparatus shown in FIG.
:1IJl~1st IJl~110, liB.

122, 130, 138, 144 are connected to six pulse motors 201.202, 203.204.205,
208, but the rest is the same. That is,
By driving the pulse motors 201 to 20B, the magnetic head holding means 7 is moved through the incoming direction moving means 7B shown in FIG.
4, the magnetic field 12 is temporarily held together with the head block 45 by the arm 96 of Y, Z, X, ez, OY, 0N (
1) It is designed to be able to move in each direction.

The magnetic sheet 10 shown in FIG. 1 is a standard sheet on which a standard signal, which is a video signal for positioning, is recorded, and as shown in FIGS. 9 and 1O, it is built in a magnetic sheet puncture 16. It is attached to the drive shaft 36 of a spindle motor 34, which is positioned with respect to a mounting jig 72 in the same manner as in the conventional case together with the chassis 28 shown in FIG. The spindle motor 34 has a frequency generator 35 that generates an AC frequency signal, and is supplied with current by a servo circuit 37 so that the magnetic seam 10 rotates at a predetermined rotational speed, for example, 3600 rotations/rotation chamber speed. Servo controlled. At this time, the value of the load current IM supplied to the spindle motor 34 is detected by the current detector 207,
The load current value at this time is supplied to a microcomputer (hereinafter referred to as CPU) 208. Further, the servo circuit 37 is connected to the CPU 20B, and controls rotational driving and stopping of the magnetic sheet IO in response to the signal DISK. P.G.
The coil 209 is disposed near the center core 20 of the magnetic sheet 10, and as the magnetic sheet 10 rotates, the PG pin 2
3 is closest, a pulse signal (hereinafter referred to as PG pulse) is generated. That is, the PG pulse is generated every rotation in synchronization with the rotation of the magnetic sheet lO, and the PG pulse is generated by the amplifier 21.
0 to the servo circuit 37 and the CPU2Q8. The magnetic helad 12 reproduces the standard signal recorded on the magnetic sheet 10. As mentioned above, in the unexamined example, the magnetic sheet 10 rotates at 3600 rotations/rotation chamber speed, so 1
One track worth of video signal every 1760 seconds of rotation, i.e.
(2) The FM modulated video signal for the field will be reproduced by the magnetic herad 12. The reproduced output of the magnetic herad 12 is supplied to a juxtaposition synchronization signal separation circuit 212 and an envelope detection circuit 213 through an amplifier 211. The vertical synchronization signal separation circuit 212 separates the vertical synchronization signal from the standard signal, and sends the corresponding pulse signal VSYNC to the CPU 208.
supply to. The envelope detection circuit 213 is a detection circuit that detects the envelope (chemical A3 line) of the standard signal and outputs a voltage corresponding to the envelope. This is supplied to the CPU 208 via an envelope amplifier 214 and an A/D converter 215.

As will be described in detail later, the CPU 208 is responsible for controlling the entire apparatus according to the operator's operations, and in particular controls the protrusion amount Ea, deviation lEb, inclination angle θa, azimuth deviation Ob, and tilt angle OC of the magnetic head 12. keys 217 , 218 , for performing Jul adjustment and tracking T,
221, 219, 220, and 218, and an f stage 76 for moving in the hole direction via pulse motors 201 to 20B.
control. That is, when the key 218 is operated, the pulse motor 201 is controlled to perform tracking T. Similarly, if the key 217 is operated, the pulse motor 202 is operated to adjust the protrusion amount Ea, and if the key 218 is operated, the pulse motor 203 is operated to adjust the deviation amount Eb, and the key 219 is operated.
Operating the key 220 causes the pulse motor 204 to adjust the azimuth deviation Ob, operating the key 220 causes the pulse motor 205 to adjust the tilt angle θC, and operating the key 221 causes the pulse motor 20B to adjust the tilt angle Oa. are controlled respectively.

FIG. 2 is a main flowchart of the apparatus of this embodiment.

As shown in the figure, start the head position adjustment control 2.
30, first, a decision block 231 determines whether or not the device is in a predetermined initial state, and if the initial state is satisfied as predetermined, a processing block 232 sets =0; In processing block 233, = +1
and set.

Thereafter, in processing block 234, the protrusion amount Ea is adjusted by applying the protrusion amount adjustment servo, which will be described in detail later.After this process is completed, the presence or absence of an error is determined in determination block 235, and if there is an error, Processing block 23
A warning process is performed in step 8, and the control is then terminated in step 237. This is because all subsequent processing proceeds while reproducing the recorded signal, so if the reproduction signal level is not higher than the predetermined level by adjusting the protrusion amount, other adjustment work may be performed. This is because it is impossible. On the other hand, if it is determined that there is no error in the process of the determination block 235, the position 21 adjustment in the Y direction, so-called tracking, is performed by applying an envelope servo, which will be described in detail later, in a process block 238, and this process ends. After that, in processing blocks 239 and 240, the tilt angle θX and tilt angle OY are sequentially adjusted by applying similar envelope servos.Furthermore, in processing block 241, the off-center servo, which will be described in detail later, is applied to adjust the deviation fi.
Eb is adjusted, and finally, in processing block 242, the same envelope control as described above is applied to adjust the azimuth deviation Ob, and in judgment block 243, it becomes =3.
Determine whether or not. As a result of this determination, if k≠3, the processing of processing blocks 233 to 242 is repeated;
That is, this series of processes is repeated three times. On the other hand, k=3
In this case, the magnetic head 12 is moved to the innermost circumference in a processing block 244, and then the magnetic head 12 is bonded in a processing block 245 to complete step 1.

All of the above processes can be performed automatically from the start 230, making it possible to reduce the number of processes and shorten the time compared to conventional systems where each process was performed manually. and all the same CPU
Since the iA alignment is performed in response to a command from the machine, the problem that the mounting accuracy of the magnetic head changes from process to process is significantly reduced.

In the explanation of the magnetic head position control system according to this embodiment in FIG. 2, a fully automatic process is shown, but it is conceivable that, for example, only the adhesion of the magnetic head 12 may be performed in the same manner as in the conventional technique. .

Hereinafter, a description will be given of a procedure when each operation for each block in FIG. 2 is manually operated from outside using keys.

FIG. 3 is a flowchart showing a subroutine of processing block 234 shown in FIG. The protrusion amount adjustment servo will be explained in detail based on the figure.

1) Restart by operating the key 217 shown in FIG.

2) Set J=O in processing block 247;

3) In processing block 248, the value of the load current IN supplied to the spindle motor 34 by the current detection base 207 shown in FIG. 1 is read into the CPU 208.

4) In decision block 248, the value of the load current and the preset setting current I of the spindle motor 34 are determined.
Compare with the value of O and if IM>In, process block 2
50, and if I M < I O, the process proceeds to processing block 251, respectively.

5) In processing block 250, pulse motor 202
1 step in the positive direction to make the protrusion 1 of the magnetic head 12
Increase 1Ea or process block 251
In this step, the pulse motor 202 is rotated one step in the opposite direction to reduce the protrusion amount Ea of the magnetic head 12.

6) At decision block 252, -IO is computed on (1), and it is determined whether this result is smaller than the allowable error εi. As a result, if the tolerance error is greater than εi, the process returns to processing block 248 and repeats the operations 3) to 5) above, that is, the pulse motor 202 is rotated in one direction or the opposite direction until the relationship IM -IO<εi is established. Make it move. On the other hand, if the relationship lN-ID<εi holds true (if the protrusion amount Ea is maintained at the optimum position), the process proceeds to processing block 253.

7) In processing block 253, set J=J+1.

8) Determine whether J=3 in decision block 254, and if YES, end the series of processes r2
On the other hand, in the case of NO, the process returns to the processing block 248 and repeats the operations 3) to 7), that is, performs this operation three times and ends 258.

FIG. 4 is a flowchart showing a subroutine of processing block 238 shown in FIG. The envelope servo (tracking servo) will be explained in detail based on the figure.

Tracking is started 257 by operating the key 216 while rotating the magnetic sheet 10 and reproducing its standard signal with the magnetic head 12.

2) In processing block 258, buffers A and B and backstep counter BS of CPU 20B are cleared.

3) In processing block 259, pulse motor 2
01 in the positive direction by one pulse to move the magnetic heald 12 toward the center of the magnetic sheath 10.

4) In processing block 260, A/D converter 215
The envelope value A/D converted by
Read into.

To give a general explanation about reading the envelope value, as the magnetic head 12 is moved, the standard signal detected by the magnetic head 12 is sent to the A/D converter 2 through the envelope detection circuit and the envelope amplifier 214.
15 as an envelope waveform. This is CP
When there is a request from U 208, the corresponding digital data is supplied to CPU 208.

5) At decision block 281, the envelope value stored in buffer A and the envelope value stored in buffer B are compared. In the first operation, buffer A is cleared, so A < 8 is guaranteed and processing block 2
Proceed to step 82.

6) As a result of the determination in the determination block 281, A≦B
When the relationship holds true, in processing block 2B2, the envelope value stored in buffer B is transferred to buffer A. 7) In processing block 263, the backstep counter BS is cleared and the steps 3) to 5) are carried out. Repeat operations 3)-7) are repeated at decision block 281 until the contents of buffer B equal or exceed the contents of buffer A.

8) In decision block 261, if the currently detected envelope value is smaller than the content of buffer A, that is, the maximum value among the envelope values detected so far, the process proceeds to processing block 264. In this processing block 284, a backstep counter BS is incremented.

9) In determination block 265, it is determined whether the value of backstep counter 89 is 2 or more. As a result of this determination, if the value of the back step counter BS is less than 2, the process returns to processing block 259 and repeats the operations 3) to 5).

10) If it is determined again in the determination block 281 that the relationship A≦B holds, that is, if the detected envelope value is smaller than the content of buffer A this time as well as the previous time, the processing block The process proceeds to step 264, where the backstep counter BS is further incremented.

At this time, if it is determined in determination block 261 that A>8, the process proceeds to processing block 262.

11) As described above, in decision block 261, A≦B.
If it is determined again that the relationship holds true, the backstep counter BS is incremented in the processing block, so the determination result in the determination block 265 becomes YES and the process proceeds to the processing block 266.The operations so far are as follows. This means that the magnetic helad 12 has passed through the peak position of the envelope value by two steps.

The reason for detecting a decrease in the envelope value by passing through two steps in this way is to reduce the influence of detection noise.

12) When it becomes clear that the magnetic head 12 has passed the peak position of the envelope value, the pulse motor 20.1 is rotated in the opposite direction to transport the magnetic head 12 in the opposite direction and return to the peak position. perform an operation, i.e. 1
．． First, in processing block 26B, the number of steps (in this example, 4 steps) is calculated by adding 2 to the number of steps indicated by the back step counter BS (2 steps in this example).
Then, the magnetic head 12 is moved in the opposite direction.

13) In processing block 287, pulse motor 20
1 in the positive direction by two pulses to move the magnetic heald 12 toward the center of the magnetic sheath 10. This eliminates the influence of backlash included in the transport system of the magnetic herad 12, and tracking ends 268.

Control in the same manner as the envelope servo is performed as a subroutine of processing blocks 239, 240 and 242 shown in FIG. That is, by operating the key 219, the envelope servo for adjusting the azimuth deviation θb is operated, and by operating the key 220, the envelope servo is used to adjust the tilt angle θb.
By operating the key 221, envelope servo for adjusting Y is started, and envelope servo for adjusting tilt angle Oa is started.

FIG. 5 is a flowchart showing a subroutine of processing block 241 shown in FIG.

The off-center servo performed in this processing block 241 focuses on the fact that the PG bin 23 and the vertical synchronization signal VSYIIC: of the standard signal recorded in the magnetic seam 10 maintain a predetermined positional relationship. That is.

As shown in FIG. 7, the position of the vertical synchronizing signal with respect to the straight line passing through the center point of the magnetic sheet 10 and the center of the PG pin 23 is determined to be a position shifted in the rotational direction by seven horizontal scanning (7H) periods. There is. Therefore, the position of the magnetic helad 12 may be determined so that the vertical synchronization signal VSYNC is detected after 7H period from the time when the PG bin 23 is detected by the PG coil 209 as the magnetic sheet 10 rotates.

The off-center servo will be explained in detail based on FIG. 5.

l) The off-center servo is started 269 by operating keys 2+8 while rotating the magnetic sheet 10 and reproducing its standard signal with the magnetic head 12.

2) At processing block 270, set N=O.

3) In the decision block 271, the PG coil 20
9, whether or not the PG pin is detected, that is, CPU 2
It is determined whether or not a PG pulse is supplied at 08, and the process proceeds to processing block 272 at the time when a PG pulse is supplied.

0 In processing block 272, the timer of the CPU 208 is reset and started when the PG pulse is detected.

5) In determination block 273, it is determined whether the time measured by the timer has exceeded a predetermined time. The predetermined time at this time is set to a time corresponding to the 7H period.
As a result of this determination, the process proceeds to decision block 274 until the predetermined time period has elapsed.

6) In decision block 274, it is determined whether or not the vertical synchronization signal VSYNC is detected from the standard signal, and if this vertical synchronization signal VSYNC: is not detected, the process returns to decision block 273. That is, when the return reaches the predetermined time, the determination block 27
3, repeat the determination of 274.

7) As a result of the determination in the determination block 273, when it is detected that the predetermined time has elapsed, that is, when the vertical synchronization signal VSYNC is not detected even after 7H period has passed after the PG pulse was detected, the processing block 275 Incidentally, in this case, it means that the magnetic helad 12 is offset from the center of the magnetic sheath 10 in the rotational direction.

8) In processing block 275, pulse motor 203
is driven in the opposite direction by one pulse to move the magnetic head 12 in the opposite direction to the rotational direction of the magnetic sheet 10. After that, P
Vertical synchronization signal VS within a predetermined time from the time of detection of G pulse
Repeat steps 3) to 6) until YNC is detected.

8) On the other hand, if the vertical synchronization signal VSYNC is detected in the 1 decision block 274, the timer is stopped in the processing block 276 at this point.

10) In decision block 277, when the timer measures p
It is determined whether tilt is less than the allowable error. As a result, if DT>ε, the process proceeds to processing block 278. Incidentally, in this case, the magnetic head 12 is a magnetic sheet! This means that it is offset from the center of zero in the direction opposite to the rotational direction.

11) In processing block 278, pulse motor 20
3 in the forward direction by one pulse to move the magnetic head 12 in the direction of rotation of the magnetic sheet IO. After that, the vertical synchronization signal VSYNC is counted from the time of detection of PG Hals.
3) to 1 until the detection point of : reaches the predetermined time value (±ε)
Repeat step 1).

12) If it is determined in processing block 277 that D〒≦ε, then in processing block 278,
Set N=N+1.

13) In judgment block 280, it is judged whether or not N22 has been reached, and if YES, the series of processing ends, while if NO, the process returns to judgment block 271 3)
The operation 12) is repeated, that is, this operation is performed twice and the process ends 281.

<Effects of the Invention> As specifically explained above in conjunction with the embodiments, according to the present invention, all five adjustments necessary for positioning the magnetic head, such as protrusion amount, tilt angle, center deviation, azimuth deviation, and tilt, can be automatically performed. It can be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a main flowchart in the embodiment, FIG. 3 is a flowchart showing a protrusion adjustment servo in the embodiment, and FIG. 4 is an envelope diagram in the embodiment. 5 is a flowchart showing the off-sensor servo in the embodiment, FIG. 6 is an explanatory diagram showing the protrusion amount and inclination angle of the magnetic head, and FIG. 7 is a flowchart showing the center deviation and azimuth deviation of the magnetic head. 8 is an explanatory diagram showing tilt, FIG. 9 is a plan view of the magnetic seat pack, FIG. 10 is a sectional view of the magnetic seat back taken along line V-V in FIG. 9, and FIG. 11 is an explanatory diagram showing the tilt. is a perspective view of a magnetic disk device, FIG. 12 is a partial perspective view of the magnetic disk device, FIG. 13 is an overall perspective view of the device according to the prior art, FIGS. 14 and 15 are partial sectional views thereof, and FIG. 16 17 is an explanatory diagram showing the inside of the field of view of an interference microscope in the conventional device, and FIG. 17 is an explanatory diagram showing the inside of the field of view of a normal microscope in the conventional device. In the drawing, 10 is a magnetic sheet, 12 is a magnetic head, and 23 is a PG pin. 34 is a spindle motor. 72 is a mounting jig, 74 is a magnetic head holding means, 76 is a hole direction moving means, and 201 to 20B are pulse motors. 207 is the current detector, 20th is the CPU. 209 is a PG coil, 212 is a vertical synchronization signal separation circuit, 213 is an envelope detection circuit, and 216 to 221 are keys.

Claims (2)

[Claims] (1) A disk-shaped magnetic disk that has a PG pin that serves as a reference for each rotation, and has a vertical synchronization signal whose recording position with respect to this PG pin is predetermined, and on which a standard signal that is a positioning video signal is recorded. A magnetic head holding means temporarily holds a magnetic head that comes into contact with the sheet and reproduces a standard signal, and a magnetic head holding means temporarily holds a magnetic head that reproduces a standard signal by contacting the sheet, and a magnetic a driving means for moving the head in the rotational direction of the magnetic sheet or a side opposite to the rotational direction; a sensor for detecting the PG pin and generating a PG pulse every rotation as the magnetic sheet rotates; a vertical synchronization signal separation circuit that separates the vertical synchronization signal from the reproduced standard signal;
Control means for adjusting the position of the magnetic head by controlling the driving means so that the time from the input of the G pulse to the input of the vertical synchronization signal is a predetermined time determined from a predetermined recording position of the vertical synchronization signal with respect to the PG pin. A magnetic head position adjustment system comprising: (2) A disc-shaped magnetic disk that has a PG pin that serves as a reference for each rotation, and has a vertical synchronization signal whose recording position with respect to this PG pin is predetermined, and on which a standard signal that is a positioning video signal is recorded. a magnetic head holding means for temporarily holding a magnetic head that comes into contact with a sheet and reproduces a standard signal; a radial deviation amount of the magnetic head from the center line of the magnetic sheet; an azimuth angle, a tilt angle, and a tilt angle of the magnetic head; a plurality of driving means for moving the magnetic head in each direction via the magnetic head holding means in order to respectively adjust the amount of protrusion of the magnetic head toward the magnetic sheet side; The PG pin is detected and the PG
A sensor that generates pulses, a vertical synchronization signal separation circuit that separates the vertical synchronization signal from the standard signal reproduced by the magnetic head, an envelope detection circuit that detects the envelope of the standard signal reproduced by the magnetic head, and a magnetic sheet that rotates a predetermined amount. A current detector detects the load current of a spindle motor which is rotated by a number of seconds, and a current detector is provided to detect the load current of a spindle motor which is rotated by a number of seconds. The driving means controls the driving means to adjust the amount of deviation, inputs the envelope value detected by the envelope detection circuit, and adjusts the azimuth angle, tilt angle, and tilt angle so that the envelope value is maximized. and further inputs the load current value of the spindle motor detected by the current detector, and controls the drive means to adjust the protrusion amount so that the load current value becomes a predetermined setting value. 1. A magnetic head position adjustment system comprising: control means for adjusting the position of the head.