JP2000357309A - Device and method for adjusting position of magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly adjust the position of a magnetic head while finely adjusting the position by imparting external energy to a part, to which a prescribed external energy is to be supplied, in the base for supporting a magnetic head, bending the base to adjust the height position of the magnetic head relative to a rotary body, obtaining its resultant image and comparing it with a target height. SOLUTION: An external energy supply means 82 emits a laser beam L through a hole to the part (A) (B), where external energy is to be supplied, on the base for supporting the magnetic head 20 of a rotary upper drum 12 on a fixed lower drum 14. At the part (A), the base is bent to adjust the height position of the magnetic head 20 relative to the rotary upper drum 12 and then, a positioning means 84 provides the supply means 82 with positioning in the part (B). The height position of the magnetic head 20 varied by the supply means 82 is displayed by a monitor 146, and compared with a target height by a processing means 86, with an adjustment quantity obtained for the remaining required height position. Thus, the position of the magnetic head 20 can be properly adjusted while its height position is finely adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for adjusting the position of a magnetic head such as a recording head and a reproducing head.

[0002]

2. Description of the Related Art In order to record information on a band-shaped information recording medium and reproduce information recorded on the band-shaped information recording medium, a rotary magnetic recording / reproducing apparatus (a rotary head drum device or a rotary magnetic recording apparatus) is used. Head device etc.). The magnetic head of this kind of rotary head drum device is
For example, a helical scan method can be used to magnetically record information on or reproduce information from a magnetic tape on a strip-shaped information recording medium, that is, a magnetic tape. In a conventional rotary head drum device, the height adjustment of a magnetic head that records and reproduces a format on and from a magnetic tape is called so-called pairing adjustment. It is necessary to adjust the height position with respect to the drum. The rotary head drum device includes a type having a rotary upper drum and a fixed lower drum, a type having an upper drum, a lower drum, and a middle drum, and a type having an upper drum, a lower drum, and a scanner. . The middle drum or the scanner rotates with respect to the upper drum or the lower drum, and a magnetic head for recording and reproduction is mounted on the middle drum or the scanner.

FIG. 18 shows a rotary head drum device 1000. The rotary head drum device 1000 includes a rotary upper drum 1001, a fixed lower drum 1002, and a motor 10
03. The fixed lower drum 1002 has a lead portion 1004 for guiding the magnetic tape. The rotating upper drum 1001 rotates continuously with respect to the fixed lower drum 1002 around a shaft 1005. The rotating upper drum 1001 has a magnetic head 1006. The magnetic head 1006 is fixed to the tip of a base 1008 as shown in FIG.
The base 1008 is rotated by the screw 1007 to rotate the upper drum 1
001. By rotating another screw 1009, the base 1008 is moved to the magnetic head 10.
06 can be adjusted along the V direction. As described above, in the example of FIG.
Reference numeral 06 adjusts the height position in the V direction using a screw 1009 for height adjustment.

In another conventional example shown in FIG. 19B, a ball 101 is interposed between a height adjusting screw 1009 and a base 1008.
0 is arranged. Also in this example, the height of the magnetic head 1006 can be adjusted in the V direction by operating the screw 1009. In still another conventional example of FIG. 19C, a hole 1011 is formed in the rotating upper drum 1001. By inserting a tool into the hole 1011 from above, a screw 1012 provided on the base 1008 is rotated. By rotating the screw 1012, the height of the magnetic head 1006 can be adjusted in the V direction.

[0005]

However, the conventional method for adjusting the height position of the magnetic head 1006 has the following problems. In helical scan recording, in order to improve recording density and transfer rate, narrow tracks, multi-heads, and high-speed rotation of a rotating drum are being advanced. Therefore, when adjusting the height of the magnetic head, it is required to perform submicron adjustment in a short time. However, it is difficult to perform fine adjustment of 1 μm or less with such a screw adjustment. In addition, there is a problem that the eccentricity of the height adjusting screw head and the elastic deformation at the time of work cause bending of a structure such as a bearing or a rotating upper drum, resulting in poor workability.

[0006] Head height adjustment performed by heating the tip of the base of the magnetic head with an external energy source (such as a laser beam) to apply thermal strain can be reduced in the amount of adjustment as compared with adjustment by a push screw. There was such a problem. (1) In the part that has been melted after being used for adjustment once,
No change occurs when energy is applied. (2) Stepwise adjustment of sending the head height by the minimum unit of adjustment is impossible by repeatedly adjusting the amount of energy for the shortage of the height adjustment amount to the target amount. . Therefore, it has been desired to establish an adjustment system that has a good work performance rate and can manage a fine adjustment amount. SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic head position adjusting device and a magnetic head position adjusting method capable of solving the above-mentioned problems and appropriately adjusting the height position of the magnetic head while performing fine adjustment.

[0007]

According to a first aspect of the present invention, a rotating body having a magnetic head and a base for supporting the magnetic head is rotated so as to be moved with respect to a band-shaped recording medium. A magnetic head position adjusting device for adjusting a height position of the magnetic head in the rotating body, wherein a minimum unit height position is provided by applying external energy to an external energy supply target portion of the base. External energy supply means for adjusting the height position of the magnetic head with respect to the rotating body by bending the base, and adjusting the external energy supply means to a predetermined position of the external energy supply target portion of the base. Positioning means for moving to a position of the magnetic head, and a height position of the magnetic head which is changed by the external energy supply means. Processing means for obtaining the remaining necessary height position adjustment amount by comparing the obtained current magnetic head height position with a preset target height of the magnetic head. And a position adjusting device for a magnetic head.

According to the first aspect, the external energy supply means adjusts the height position of the minimum unit by applying external energy to the external energy supply target portion of the base, thereby bending the base and rotating the rotating body. Adjust the height position of the magnetic head with respect to. The positioning means moves the external energy supply means to a predetermined position of the external energy supply target site on the base to perform positioning. The processing means is
The height position of the magnetic head, which is changed by the external energy supply means, is acquired as an image, and the acquired current height position of the magnetic head is compared with a preset target height of the magnetic head to obtain the remaining height. Obtain the required height position adjustment. Thereby, the height position of the magnetic head can be appropriately adjusted and set efficiently while checking the remaining necessary height position adjustment amount.

According to a second aspect of the present invention, in the magnetic head position adjusting device according to the first aspect, the adjustment of the height position of the minimum unit includes a coarse adjustment and a fine adjustment, and the external energy supply of the base is performed. The target part includes the target part for the coarse adjustment and the target part for the fine adjustment. According to the second aspect, the adjustment of the height position of the minimum unit includes a coarse adjustment and a fine adjustment. Therefore, the height adjustment of the magnetic head can be adjusted by combining the coarse adjustment and the fine adjustment as necessary. Can be performed accurately.

According to a third aspect of the present invention, in the position adjusting device for a magnetic head according to the second aspect, the external energy supply means is a laser light generating device for generating a laser light, and the laser light is generated by the laser light. The adjustment target portion and the fine adjustment target portion are eliminated. According to the third aspect, the height position of the magnetic head can be accurately adjusted by appropriately eliminating the rough adjustment target portion and the fine adjustment target portion by using a laser beam.

According to a fourth aspect of the present invention, in the magnetic head position adjusting device according to the third aspect, the target portion for rough adjustment is a convex portion forming a concave portion arranged on the base, and The adjustment target portion is a convex portion forming a concave portion arranged on the base. According to a fourth aspect of the present invention, the height position of the magnetic head can be accurately adjusted without affecting the surrounding portions by irradiating the convex portion with a laser beam to eliminate a part of the convex portion. Can be.

According to a fifth aspect of the present invention, in the magnetic head position adjusting device according to the fourth aspect, the positioning means comprises:
The external energy supply means is moved by an arrangement pitch of the convex portions for the rough adjustment target portion or by an arrangement pitch of the convex portions for the fine adjustment target portion. According to the fifth aspect, since the positioning means can move the external energy supply means by the arrangement pitch of the projections, the projections to be eliminated in accordance with the adjustment required in the height adjustment operation of the magnetic head. However, the external energy supply means can be accurately moved. As a result, the correct position of the magnetic head can be adjusted step by step.

According to a sixth aspect of the present invention, in the magnetic head position adjusting device according to the fourth aspect, the convex portion for the rough adjustment target portion is arranged at a position distant from the magnetic head. The convex portion for the target portion for fine adjustment is arranged at a position close to the magnetic head, and the positioning means, the external energy supply means, the convex portion for the target portion for coarse adjustment, It can be moved and positioned between the fine adjustment target portion and the convex portion. In claim 6,
The projection for coarse adjustment is arranged at a position distant from the magnetic head, and the projection for fine adjustment is arranged at a position near the magnetic head. Thereby, the coarse position of the magnetic head can be coarsely adjusted by supplying external energy to the convex portion for coarse adjustment. By supplying the external energy to the convex portion for fine adjustment, the magnetic head can be adjusted. Fine adjustment of the height position can be performed. At this time, the positioning means can move and position the external energy supply means to either the fine adjustment convex part or the coarse adjustment convex part. As a result, the correct position of the magnetic head can be adjusted step by step.

According to a seventh aspect of the present invention, the magnetic head is adapted to be moved with respect to a band-shaped recording medium by rotating a rotating body having a magnetic head and a base supporting the magnetic head. A method of adjusting the position of a magnetic head for adjusting a height position in a rotating body, wherein a minimum unit of a height position is provided by applying external energy from an external energy supply unit to an external energy supply target portion of the base. By performing the adjustment, when adjusting the height position of the magnetic head with respect to the rotating body by bending the base, the positioning means is used to move the external energy supply means to a predetermined position of the external energy supply target portion of the base. Position by moving to the position of the magnetic head, the height position of the magnetic head, which is changed by the external energy supply means, is obtained as an image. Comparing the acquired current height position of the magnetic head with a preset target height of the magnetic head to obtain an adjustment amount of the remaining necessary height position. This is the position adjustment method.

According to a seventh aspect of the present invention, the external energy supply means adjusts the minimum unit height position by applying external energy to the external energy supply target portion of the base, thereby bending the base and rotating the rotating body. Adjust the height position of the magnetic head with respect to. The positioning means moves the external energy supply means to a predetermined position of the external energy supply target site on the base to perform positioning. The processing means is
The height position of the magnetic head, which is changed by the external energy supply means, is acquired as an image, and the acquired current height position of the magnetic head is compared with a preset target height of the magnetic head to obtain the remaining height. Obtain the required height position adjustment. Thus, the height position of the magnetic head can be adjusted appropriately and set efficiently.

According to an eighth aspect of the present invention, in the magnetic head position adjusting method according to the seventh aspect, the adjustment of the height position of the minimum unit includes a coarse adjustment and a fine adjustment, and the external energy supply of the base is performed. The target part includes the target part for the coarse adjustment and the target part for the fine adjustment. According to the eighth aspect, the adjustment of the height position of the minimum unit includes the coarse adjustment and the fine adjustment. Therefore, the height adjustment of the magnetic head can be adjusted by combining the coarse adjustment and the fine adjustment as necessary. Can be performed accurately.

According to a ninth aspect of the present invention, in the magnetic head position adjusting method according to the eighth aspect, the external energy supplying means is a laser light generating device for generating a laser light, and The adjustment target portion and the fine adjustment target portion are eliminated. According to the ninth aspect, the height position of the magnetic head can be accurately adjusted by appropriately eliminating the target portion for the coarse adjustment and the target portion for the fine adjustment by using the laser beam.

According to a tenth aspect of the present invention, in the magnetic head position adjusting method according to the seventh aspect, the rough adjustment target portion is a convex portion forming a concave portion arranged on the base, and The adjustment target portion is a convex portion forming a concave portion arranged on the base. According to the tenth aspect, if a portion of the convex portion is eliminated by irradiating the convex portion with a laser beam, the height position of the magnetic head can be accurately adjusted without affecting the surrounding portion. Can be.

According to an eleventh aspect of the present invention, in the magnetic head position adjusting method according to the tenth aspect, the positioning means controls the external energy supply means to provide an array pitch of the convex portions for the rough adjustment target portion. Or the arrangement pitch of the projections for the fine adjustment target portion. According to the eleventh aspect, since the positioning means can move the external energy supply means by the arrangement pitch of the projections, the positioning means can adjust the height necessary for the height adjustment work of the magnetic head,
The external energy supply means can be accurately moved with respect to the protrusion to be eliminated. As a result, the correct position of the magnetic head can be adjusted step by step.

According to a twelfth aspect of the present invention, in the magnetic head position adjusting method according to the tenth aspect, the convex portion for the rough adjustment target portion is arranged at a position distant from the magnetic head. The convex portion for the target portion for fine adjustment is arranged at a position close to the magnetic head, and the positioning means, the external energy supply means, the convex portion for the target portion for coarse adjustment, It can be moved and positioned between the fine adjustment target portion and the convex portion. Claim 12
In the example, the convex portion for coarse adjustment is arranged at a position distant from the magnetic head, and the convex portion for fine adjustment is arranged at a position close to the magnetic head. Thereby, the coarse position of the magnetic head can be coarsely adjusted by supplying external energy to the convex portion for coarse adjustment. By supplying the external energy to the convex portion for fine adjustment, the magnetic head can be adjusted. Fine adjustment of the height position can be performed. At this time, the positioning means can move and position the external energy supply means to either the fine adjustment convex part or the coarse adjustment convex part. As a result, the correct position of the magnetic head can be adjusted step by step.

[0021]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIGS. 1 and 2 show a rotary head drum device 10 to which the height of the magnetic head is adjusted by the magnetic head position adjusting device of the present invention. FIG. 1 is a sectional view of the rotary head drum device 10 in the axial direction.
FIG. 2 is a plan view of the rotary head drum device 10. In FIG. 1, a rotary head drum device 10 includes a rotating upper drum (rotating body) 12, a fixed lower drum 14 and a motor 16.
have. The rotating upper drum 12 is called a rotating drum or an upper drum, and is a rotating body in the present invention. The fixed lower drum 14 is also called a fixed drum or a lower drum. The rotating upper drum 12 is fixed to an upper portion of the shaft 18 by press fitting or the like. Rotating upper drum 12
Has one or more magnetic heads 20. This magnetic head 20 is fixed to a head base 22. The head base 22 is fixed to the lower side of the rotary upper drum 12 by screws 24. The rotating upper drum 12
A hole 26 is provided near the screw 24. The hole 26 is a hole for passing a laser beam L described later to the head base 22.

As shown in FIG. 2, four magnetic heads 20 are provided, for example, at every 90 degrees. Therefore, screw 2
4 are also provided at four places, and the hole 26 is also provided on the rotating drum 12
Are provided at four locations. These magnetic heads 20
Is a magnetic head for recording, a magnetic head for reproduction, or a magnetic head for recording / reproduction. The function of the magnetic head is selected and set depending on the model. The fixed lower drum 14 of FIG.
It has 0. Bearings 32 are arranged in the support portion 30. These bearings 32
The shaft 18 of the rotating upper drum 12 is rotatably supported.
A lead portion 34 for guiding the magnetic tape to the vicinity of the magnetic head 20 is formed on the peripheral surface of the fixed lower drum 14.

The motor 16 has a rotor 34 and a stator 36. The stator 36 is provided integrally with the fixed lower drum 14. The stator 36 has a coil 38 wound around an iron core. The rotor 34 has a rotor yoke 40, a boss 42, and a magnet 44. Boss 42 is shaft 1
8 is fixed to the lower end by press fitting or the like. The rotor yoke 40 is made of a magnetic material, and is fixed to the boss 42 by caulking or the like. A driving magnet 44 is arranged inside the outer peripheral portion of the rotor yoke 40.
The driving magnet 44 is, for example, a plastic magnet in which S poles and N poles are alternately multi-polarized.

Thus, when current is supplied to the coil 38 from the outside via the stator substrate 46, the coil 3
8 and the magnetism of the magnet 44 interact to rotate the rotor 34 with respect to the stator 36. The rotation of the rotor 34 causes the rotating upper drum 12 to rotate the shaft 18.
, And continuously rotates with respect to the fixed lower drum 14. As the upper drum 12 rotates continuously, the magnetic head 20 travels on the magnetic tape T in a so-called helical scan mode to magnetically record information on the magnetic tape T, or Information can be reproduced magnetically.

The upper drum 12 has a rotor core 50 of a rotary transformer. The fixed lower drum 14 has a stator core 52 of a rotary transformer. Signals are exchanged between the rotor core 50 and the stator core 52 in a magnetically non-contact manner. For example, a recording signal to be recorded on the magnetic tape T by the magnetic head 20 is transmitted from outside via the stator core 52 and the rotor core 50 to the magnetic head 2.
0 is supplied. When the information on the magnetic tape T is reproduced by the magnetic head 20, a reproduced signal is supplied from the magnetic head 20 to the outside through the stator core 52 via the rotor core 50. The rotary head drum device 10 shown in FIGS. 1 and 2 is of a so-called two-drum type having a rotary upper drum 12 and a fixed lower drum 14. However, the present invention is not limited to this, and a so-called three-layer rotary head drum device in which the middle drum or the scanner rotates and the upper drum and the lower drum are fixed may be used.

FIG. 3 shows a preferred embodiment of a device for adjusting the position of the magnetic head 20 in the V direction in the rotary head drum device 10 shown in FIGS. The adjustment of the height of the magnetic head is also called a bearing adjustment, and the rotary head drum device 10 is set on the drum base 70. Fixed lower drum 1
4 is detachably fixed to the drum base 70. The magnetic head position adjusting device 80 shown in FIG. 3 has the following configuration. The magnetic head position adjusting device 80 generally includes an external energy supply unit 82, a positioning unit 84, a processing unit 86, a main base 88, a drum base 70, and a rotating drum indexing unit 90.

The index means 90 of FIG. 3 will be described. The index means 90 moves the magnetic head 20 whose height position is to be adjusted by rotating the rotary upper drum 12 of the rotary head drum device 10 mounted on the drum base 70 to the objective lens 92 of the processing means 86. This is a device for indexing. For this purpose, the index means 90 is provided with the head index motor 9.
4, a roller 96, and an index motor driver 98. The head index motor 94 is mounted on the drum base 70, and the head index motor 94 rotates the roller 96 to index the upper drum 12 around the shaft 18. The index motor driver 98 drives the head index motor 94 based on instructions from the arithmetic and control unit 100.

The external energy supply means 82 shown in FIG. 3 has a laser control unit 102, a transmitter 104, and an irradiation nozzle 106. The laser control unit 102 controls the transmitter 1 based on the calculation of the processing unit 86 and the command from the control unit 100.
04 is operated. When the transmitter 104 operates, the irradiation nozzle 106 irradiates the laser beam L vertically downward.

Here, an example of the type of the laser light L will be described. The material of the head base 22 of the magnetic head 20 shown in FIG. 1 is, for example, brass, aluminum, stainless steel, or the like. As an example, the head base 22
Is 4 mm and the thickness is 0.6 mm, for example, a YAG laser can be used as the laser. The pulse width t when oscillating the laser light L in this case is, for example, 1 ms, and the spot diameter of the laser light L is 0.3 mm. Under these conditions,
As a pre-process before actually performing height adjustment, dust or the like is removed by irradiating the laser beam with energy of 0.01 J / P. Thereafter, the head base 22 is irradiated with laser beam energy corresponding to the height adjustment required for the magnetic head 20. For example, 3 from the tip of the head base 22
When the laser beam L is applied to a position at a distance of 1 mm, if the height adjustment width of the magnetic head 20 is 1.5 μm, about 1 J /
Irradiation with P energy may be performed.

FIG. 4 shows that the material of the head base 22 is C2
The example of the deformation amount with respect to the base thickness in the case of 680-1 / 2H and the case of SUS304-2B is shown. The example of FIG. 4 shows a case of a flat head base, and a head base 22 having a slotted groove described later will be described.
In order to achieve the deformation amount of FIG. 4 (1) or FIG. 4 (2), the energy used is as shown in FIG.
(1) or about 60 to 70% of FIG.

Next, the positioning means 84 of FIG. 3 will be described. The positioning means 84 includes an XY stage driver 110, an X stage 112,
It has a Y stage 114. The X stage 112
It is arranged on the rail 118 of the fixing part 116. When the motor 120 operates, the X stage 112 moves the rail 11
Along 8, it can be moved and positioned in the X direction. Y
The stage 114 is arranged on the rail 122 of the X stage 112. When the motor 124 operates, the Y stage 114 moves along the rail 122 and can be positioned. The irradiation nozzle 106 for the laser light L is attached to the Y stage 114, and the laser light L is irradiated from the irradiation nozzle 106 in a vertically downward direction (Z direction). The irradiated laser light L is directly irradiated through a hole 26 to a predetermined position of the indexed head base 22 of the rotating upper drum 12 as shown in FIG. External energy supply target portion of the head base 22 (head base 2
The upper surface 22 </ b> A of the second device 22 can acquire an image through a hole 26 by a CCD camera (charge-coupled device camera) 130. The state of the upper surface 22A of the head base 22 obtained by the CCD camera 130 is enlarged and displayed on the monitor 132.

Next, the processing means 86 of FIG. 3 will be described. The processing means 86 includes an arithmetic and control unit 100, an image processing unit 140, an image capturing unit 142, a CCD driver 144, a monitor 146, a CCD camera 148, a lens barrel unit 150, an autofocus stage 152, an objective lens 92, and a stage driver 154. And a light source 156. The objective lens 92 is a lens that optically captures the indexed head sliding surface 170 of the magnetic head 20. Magnetic head 20 captured by objective lens 92
The image of the head sliding surface is CCD through the lens barrel 150
In the camera 184, the light is converted from light to electricity, and is enlarged and displayed on the monitor 146 by the CCD driver 144. The head sliding surface 170 of the magnetic head 20 is displayed at the monitor 146 reference line LL.

The light source 156 supplies light from the objective lens 92 to the head sliding surface 170 of the magnetic head 20 via the lens barrel 150. The lens barrel 150 and the CCD camera 14
8 is mounted on the auto focus stage 152. The autofocus stage 152 moves and positions the lens barrel 150 and the CCD camera 148 in the X direction by operating the motor 152A with respect to the main base 88. Thereby, the focus of the objective lens 92 is adjusted to the head sliding surface 170. Arithmetic and control unit 100
Gives a command to the stage driver 154, the stage driver 154 operates this motor 152A,
Activate auto focus operation. CCD driver 144
Is supplied to the image processing unit 140 and the calculation and control unit 100 via the image capturing unit 142.

FIG. 6 shows an example of the shape of the head base 22 and the magnetic head shown in FIG. 1 or FIG.
The head base 22 includes a wide portion 200 and a narrow portion 210.
have. The wide portion 200 and the narrow portion 210 form the upper surface 22A. The narrow part 210 is the wide part 2
This is an overhang portion for 00. Head base 2
The magnetic head 20 as a head chip is fixed to the tip of the two narrow portions 210 by bonding or the like. The narrow portion 210 of the head base 22 has an external energy supply target portion 240 for coarse adjustment and an external energy supply target portion 250 for fine adjustment. The external energy supply target portion 240 has a plurality of slits 241 for coarse adjustment. Similarly, a plurality of slots 251 are formed in the external energy supply target portion 250 for fine adjustment. These slits 241 and 251 are grooves of the same size and are formed at the same pitch P as shown in the cross-sectional view along the line AA shown in FIG. The slits 241 are concave portions for coarse adjustment, and the slits 251 are concave portions for fine adjustment. Adjacent slits 241 and 241 are separated by a convex portion 261. Suriwari 25 adjacent in the same way
1, 251 are also separated by the convex portion 271. As shown in FIG. 8, the swari 241 and 251 have, for example, the same width w, the same length e, and the same depth f.

The wide portion 200 in FIG. 6 has a head base mounting hole 300. 9 and 10, the mounting surface 200A of the wide portion 200 is fixed to the lower surface 12E of the rotating upper drum 12 via a washer 12F. As shown in FIG.
Reference numeral 41 is formed at a position distant from the magnetic head 20. On the other hand, the fine adjustment slot 251 is formed at a position close to the magnetic head 20. This is because the protrusions 26 between the coarse adjustment slits 241 are formed.
This is because the position of the magnetic head 20 can be adjusted with a large minimum unit change amount D1 as shown in FIG. 9 by eliminating 1 from the laser beam L. On the other hand, by irradiating the laser light L to the convex portion 271 on the side of the fine adjustment slippery 251, the amount of change in the minimum unit D 2 is smaller than the large change D 1 shown in FIG. Then, the height of the magnetic head 20 is adjusted.

FIG. 11 shows an example of the slots 241 and 251 and the projections 261 and 271. The convex portion 261 is
For example, the convex portions 261A, 261B, 261C, 261
D, 261E. Similarly, the convex portion 271 is
Projection 271A, Projection 271B, Projection 271C, Projection 27
1D, and has a convex portion 271E. FIG. 12 shows that the irradiation nozzle 10 is operated by operating the positioning means 84 of FIG.
6 shows an example in which the projections 161 are positioned on the projections 161 and 171 along the X direction. FIG. 13 shows a laser beam L of the irradiation nozzle 106 using the positioning means 84 of FIG.
Are moved at predetermined pitches p corresponding to the convex portions.

FIG. 14 shows a state in which the laser beam L is irradiated on the convex portion 261 on the side of the slip adjuster 241 for coarse adjustment. The laser beam L is applied to the projection 261A for coarse adjustment of the head base 22 as shown in FIG.
Irradiation as shown in FIG. 14C, as shown in FIG.
1A has a vanishing portion 350 formed therein. Thus, a large minimum unit change amount D1 of the magnetic head 20 due to the coarse adjustment as shown in FIG. 9 can be set.

FIG. 15A shows a projection 27 for coarse adjustment.
1A shows an example in which a laser beam L is applied to 1A. Also in this case, as shown in FIGS. 15B and 15C, the disappearing portion 370 is formed in the convex portion 271A. When such a lost portion 370 is formed, a small minimum unit change amount D2 for finely adjusting the height of the magnetic head 20 can be set as shown in FIG.

Next, an example in which the position of the magnetic head is adjusted by the above-described magnetic head position adjusting device will be described. The motors 120 and 124 shown in FIG. 5 may be, for example, stepping motors. FIG.
The CCD camera 148 has a high resolution, and preferably has, for example, one million or more pixels.

A method for adjusting the height position of the magnetic head 20 will be described with reference to FIG. As shown in FIG. 3, the magnetic head 20 of the rotating upper drum 12 has already been indexed and faces the objective lens 92. As a result, the objective lens 92 moves the sliding surface 170 of the magnetic head 20.
Can be displayed on the monitor 146. In step S1 of FIG. 17, the head sliding surface 17 of the magnetic head 20 is
A reference position of 0 is detected. That is, the head sliding surface 17
0 is taken into the CCD camera 148 via the objective lens 92. The CCD camera 148 converts the image signal from light / electricity into a monitor 146 through a CCD driver 144.
To display the head sliding surface 170, and supply the position information of the head sliding surface 170 to the image processing unit 140 and the arithmetic and control unit 100 via the image capturing unit 142.

The head sliding surface 170 displayed on the monitor 146 is used for visual observation by an operator. In step S2, the image processing unit 140
Lower edge 171 of head sliding surface 170 which is a reference position of
Is detected. Lower edge 17 detected by image processing unit
The calculation unit calculates the height h of the magnetic head between the lower edge 171 and the reference line LL from the position of one pixel. From the difference between the height h of the magnetic head 20 and a target value at a predetermined height position, the calculation and control unit 100 calculates the height adjustment amount of the magnetic head to be adjusted next. Then, the control unit 100 gives a command to the laser control unit 102, the XY stage driver 110, and the like based on the control, and additionally performs the height adjustment of the magnetic head 20.

At this time, as shown in FIG. 16, the external energy supply target portion 240 for coarse adjustment and the external energy supply target portion 250 for fine adjustment shown in FIG.
And the amount of change in the height of the magnetic head when each is irradiated with the laser beam L (the large minimum unit change amount D1 and the small minimum unit change amount D2 shown in FIGS. 9 and 10), respectively. . In FIG. 16A, when the amount of change in the coarse adjustment unit is smaller than the adjustment amount to be adjusted, a coarse adjustment operation is performed. As shown in FIG. 16 (2), the change amount D2 in the fine adjustment unit
However, when the adjustment amount to be adjusted is smaller than the adjustment amount and the change amount D1 in the coarse adjustment unit is larger than the adjustment amount to be adjusted, the fine adjustment operation is performed. As shown in FIG. 16C, when the adjustment amount to be adjusted is smaller than the change amount D2 in the fine adjustment unit,
The adjustment cannot be performed, so cancel the adjustment. FIG.
According to the procedure shown in (1), the height position of the magnetic head 20 is driven into a predetermined correct height position.

In step S2 of FIG. 17, the height of the magnetic head is calculated as described above, and the next adjustment amount to be adjusted is calculated from the difference from the target value. It is determined whether to perform the coarse adjustment or the fine adjustment. When performing the coarse adjustment, the process proceeds to step S3, and in step S4, the laser beam irradiation position is positioned with respect to a predetermined coarse adjustment portion. That is, first, as shown in FIG. 13, the laser beam L is positioned on the central convex portion 261A (see FIG. 11) of the coarse adjustment slipper 241. Then, a central convex portion 261 for coarse adjustment as shown in FIG.
The positioning of the laser beam at A is indicated by the CCD 13 in FIG.
On the monitor 132 through 0, the operator visually checks. When the laser beam L is applied to the projection 261A, a disappearance portion 350 is formed as shown in FIG.
That is, the central portion of the convex portion 261A is melted and disappears. As a result, as shown in FIG. 9, the magnetic head 20 changes its height in the V direction with a large minimum unit change amount D1.

In step S5 in FIG. 17, the arithmetic and control unit 100 in FIG. 3 determines whether or not further coarse adjustment is necessary. Change positioning. That is, for example, the laser beam L is positioned on the convex portion 261B next to the convex portion 261A shown in FIG. In step S6,
If this coarse adjustment is repeated the required number of times,
The laser light L is sequentially emitted in the order of 1A, 261B, 261C, 261D, and 261E, and the large minimum unit change amount D1 shown in FIG. 9 is added one after another.

Next, as shown in step S7, it is determined whether or not fine adjustment is necessary. If fine adjustment is required, the process proceeds to the fine adjustment step of step S8. In step S9, FIG.
The central fine adjustment projection 271A shown in FIG. 1 (see FIG. 11).
Is positioned with the laser beam. And the laser beam is projected to
When irradiated to 71A, as shown in FIG.
70 will be formed. Therefore, as shown in FIG. 10, the height of the magnetic head 20 can be adjusted in the V direction by the small minimum unit change amount D2. Step S shown in FIG.
The arithmetic and control unit 100 in FIG. 3 determines whether or not further fine adjustment is necessary in step 10, and if necessary, in step S11, positions the laser beam with respect to the convex portion 271B in FIG. The projection 271B is irradiated. If fine adjustment is required a plurality of times, the laser light is projected to the convex portions 271A, 271B, 271C, 271D, 2
Irradiation is performed in the order of 71E.

When the laser beam is moved from the rough adjustment side projection 261 to the fine adjustment side projection 271 side, the irradiation nozzle 106 is moved and positioned as shown in FIG.
On the other hand, when moving between convex portions for rough adjustment or moving between convex portions for fine adjustment, as shown in FIG.
The irradiation nozzle 106 is moved by a predetermined pitch P. When the height adjustment of the magnetic head of the predetermined amount is completed in this way, it is determined in step S12 whether the next height adjustment of the magnetic head is performed.
In FIG. 3, the head index motor 94 operates to move the rotating upper drum 12 to, for example, 90 degrees or 18 degrees.
Indexed by 0 or 270 degrees, the next magnetic head 20 faces the objective lens 92. The head index motor 94 is not operated until the height adjustment of one magnetic head 20 is completed.

In the embodiment of the present invention, the irradiation condition of the laser beam to be applied during the fine adjustment and the coarse adjustment is always kept constant. Due to variations in the height of the magnetic head predicted from the accumulated tolerance of the assembled parts and the accuracy finally required, the irradiation conditions (peak) of the laser beam capable of absorbing the possible coarse adjustment and fine adjustment of the head height The power, pulse width, etc., and the design of the head base (base material, base thickness, width, spacing, length, etc.) must be experimentally verified in advance.

In the embodiment of the present invention, fine head height adjustment can be automatically performed by a system combining a function of operating the head height with external energy and a function of automatically measuring the head height. . The function part for controlling the head height by the external energy has a mechanism for feeding the laser beam or the like to each of the projections of the irregularities by a pitch corresponding to the irregularities, and irradiates the same place twice. The magnetic head can always move the same amount of adjustment. There is a mechanism to send to the front and back unevenness group to apply external energy to the rough adjustment unevenness group provided at the root part of the head base overhang and the fine adjustment unevenness group provided at the tip, so the remaining adjustment amount Coarse adjustment can be performed in accordance with the condition, and a highly accurate height adjustment operation can be efficiently performed. In addition, since the irradiation laser condition can always be kept constant, the variation in laser light due to the change in the condition can be suppressed, and the lamp life can be extended.

In the embodiment of the present invention, in assembling and adjusting the rotary magnetic head device, a device for causing a minimum unit of height change by external energy is provided on a plurality of head bases, and each of them is operated by external energy. Mechanism and head height can be measured automatically.

In the embodiment of the present invention, the head base portion of the rotary magnetic head device is provided with a plurality of adjustment structures (for example, unevenness due to slippage) for bending the head base by external energy, and changes due to external energy occur. By limiting the portion, height adjustment of the minimum unit is possible, and adjustment with good reproducibility is realized. At the time of height adjustment, a minimum energy for eliminating the convex portion by an external force such as a laser is given to each of the convex portions of the plurality of adjusting structures provided in the base, and a bending change of less than a desired minimum adjustment amount is applied to the head base. give. The height adjustment is performed by repeating this operation a plurality of times. At the time of this height adjustment work, the system that combines the function of operating the head height with external energy and the function of automatically measuring the head height automatically measures the height change due to each adjustment, The amount of adjustment to the target height is calculated, the number of remaining necessary coarse adjustments and fine adjustments is set, and the adjustment is continued to reach the target height.

The present invention is not limited to the above embodiment. Although the swari formed on the head base has a rectangular parallelepiped shape in the illustrated example, the present invention is not limited thereto, and the cross section may have a triangular shape. That is, the projections for the coarse adjustment and the projections for the fine adjustment may of course be triangular in cross section. The external energy supply means is not limited to a means for generating laser light such as YAG, CO ₂ or excimer laser, and may employ electric discharge machining.

[0053]

As described above, according to the present invention,
The height position of the magnetic head can be properly adjusted while making fine adjustments.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a rotary head drum device having a magnetic head to be adjusted according to the present invention.

FIG. 2 is a plan view of the rotary head drum device of FIG.

FIG. 3 is a diagram showing a preferred embodiment of a magnetic head position adjusting device for adjusting the height of the magnetic head;

FIG. 4 is a view showing a material and the like of a head base in a method of adjusting the height of a magnetic head when laser light is used.

FIG. 5 is a diagram showing a positioning unit, a head base, a magnetic head, and the like.

FIG. 6 is a perspective view showing a preferred example of a magnetic head and a head base.

FIG. 7 is a sectional view of the head base taken along line AA of FIG. 6;

FIG. 8 is a perspective view showing an example of the shape of a swari.

FIG. 9 is a diagram showing an example of irradiating a laser beam during coarse adjustment.

FIG. 10 is a diagram showing an example of irradiating a laser beam at the time of fine adjustment.

FIG. 11 is a plan view showing a protrusion for rough adjustment and a protrusion for fine adjustment, and a slot.

FIG. 12 is a diagram showing an example in which a laser beam is moved between a convex portion for coarse adjustment and a convex portion for fine adjustment.

FIG. 13 shows how to move a laser beam between convex portions for fine adjustment,
The figure which shows the example which moves between convex parts for coarse adjustment.

FIG. 14 is a view showing an example in which a convex portion for rough adjustment is irradiated with laser light to melt and disappear.

FIG. 15 is a diagram showing an example in which a laser beam is irradiated to melt and eliminate a fine adjustment projection.

FIG. 16 is a diagram showing the distinction between coarse adjustment, fine adjustment, and no adjustment.

FIG. 17 is a diagram showing an example of a work process of coarse adjustment and fine adjustment.

FIG. 18 is a sectional view showing a conventional rotary head drum device.

FIG. 19 is a diagram showing an example of height adjustment of a magnetic head in a conventional rotary head drum device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Rotating head drum device, 20 ... Magnetic head, 22 ... Head base (base), 26 ... Hole for letting laser beam L pass, 80 ... Magnetic head position adjustment device, 82 ··· external energy supply means
..Positioning means, 86 processing means, 90 index means

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Noritoshi Eguchi, Inventor 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo F-term within Sony Corporation (reference) 5D036 AA14 AA16 BB02 GG05 5D042 AA05 BA07 CA01 CA04 CA08 DA20

Claims (12)

[Claims] 1. A height of the magnetic head, which is moved with respect to a band-shaped recording medium, by rotating a rotary body having a magnetic head and a base supporting the magnetic head, the height of the magnetic head at the rotary body. A position adjustment device for a magnetic head for adjusting a position, wherein the base is bent by adjusting the height position of a minimum unit by applying external energy to an external energy supply target portion of the base. External energy supply means for adjusting the height position of the magnetic head with respect to the rotating body, and positioning means for moving and positioning the external energy supply means to a predetermined position of the external energy supply target portion of the base. The height position of the magnetic head, which is changed by the external energy supply means, is acquired by an image, and the acquired current position is acquired. Processing means for comparing the height position of the magnetic head with a preset target height of the magnetic head to obtain the remaining necessary adjustment amount of the height position. Head position adjustment device. 2. The adjustment of the height position of the minimum unit includes a coarse adjustment and a fine adjustment, and the external energy supply target portion of the base includes the coarse adjustment target portion and the fine adjustment target. 2. The position adjusting device for a magnetic head according to claim 1, including a portion. 3. The external energy supply means is a laser light generator for generating a laser beam, and the laser beam causes the rough adjustment target portion and the fine adjustment target portion to disappear. 3. The position adjusting device for a magnetic head according to claim 1. 4. The target portion for rough adjustment is a convex portion forming a concave portion arranged on the base, and the target portion for fine adjustment is a convex portion forming a concave portion arranged on the base. 4. The position adjusting device for a magnetic head according to claim 3, wherein: 5. The positioning means moves the external energy supply means by an arrangement pitch of the projections for the coarse adjustment target portion or by an arrangement pitch of the projections for the fine adjustment target portion. The position adjustment device for a magnetic head according to claim 4. 6. The projection for the rough adjustment target portion is located at a position distant from the magnetic head, and the projection for the fine adjustment target portion is located at a position close to the magnetic head. The positioning means, the external energy supply means,
5. The magnetic head position adjusting device according to claim 4, wherein the position can be moved by positioning between the convex portion for the coarse adjustment target portion and the convex portion for the fine adjustment target portion. 7. A height of the magnetic head, which is moved with respect to a band-shaped recording medium, by rotating a rotating body having a magnetic head and a base supporting the magnetic head, the height of the magnetic head at the rotating body. A position adjustment method of a magnetic head for adjusting a position, wherein a minimum unit height position is adjusted by applying external energy from an external energy supply unit to an external energy supply target portion of the base. When adjusting the height position of the magnetic head with respect to the rotating body by bending the base, the positioning means is used to move the external energy supply means to a predetermined position of the external energy supply target portion of the base. The height position of the magnetic head, which is changed by the external energy supply means, is acquired by an image, Comparing the height position of the magnetic head with a preset target height of the magnetic head to obtain a remaining necessary height position adjustment amount. . 8. The adjustment of the height position of the minimum unit includes a coarse adjustment and a fine adjustment, and the external energy supply target portion of the base includes the coarse adjustment target portion and the fine adjustment target. The method for adjusting the position of a magnetic head according to claim 7, comprising a portion. 9. The external energy supply means is a laser light generator for generating a laser beam, and the laser beam causes the rough adjustment target portion and the fine adjustment target portion to disappear. 3. The method for adjusting the position of a magnetic head according to claim 1. 10. The rough adjustment target portion is a convex portion forming a concave portion arranged on the base, and the fine adjustment target portion is a convex portion forming a concave portion arranged on the base. The method for adjusting the position of a magnetic head according to claim 7, wherein: 11. The positioning unit moves the external energy supply unit by an arrangement pitch of the projections for the coarse adjustment target portion or by an arrangement pitch of the projections for the fine adjustment target portion. The method for adjusting the position of a magnetic head according to claim 10. 12. The projection for a rough adjustment target portion,
It is arranged at a position away from the magnetic head, the convex portion for the target portion for fine adjustment is arranged at a position close to the magnetic head, The positioning means, the external energy supply means,
The method for adjusting the position of a magnetic head according to claim 10, wherein the positioning can be performed by moving between the convex portion for the coarse adjustment target portion and the convex portion for the fine adjustment target portion.