JPH06301945A - Assembly of video head and cylinder, and method and apparatus for manufacturing the assembly - Google Patents

Abstract

PURPOSE:To adjust the height with high accuracy by pressurizing and deforming a surface of a head base of a video head to be attached to a cylinder, and attaching the surface while adjusting the height of a magnetic head. CONSTITUTION:A head base loaded on a head base handling mechanism (not shown) is moved to butt until it touches a side face of a reference block 9, and pushed up as a pushing pin 11 is raised, thereby, the head base is completely positioned. After the head base is brought to butt against the reference block 9 in the above manner, a magnetic head 3 is positioned in the X, Y, Z directions by a positioning mechanism (not shown). A height adjusting plate 13 and a weight applying pin 14 hold the magnetic head 3 therebetween in the up-and- down direction. After the magnetic head 3 is measured through image processing by a detecting optical system 16, the height adjusting plate 13 is driven to set the height of the magnetic head according to the measured value. Positioning of the magnetic head is thus completed. At this time, before the magnetic head 3 is bonded with an adhesive 4, the head base is pressed to the reference block 9 via the pushing pin 11 with a load to deform the head base and, the magnetic head is bonded with the adhesive 4. The video head is taken out thereafter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in a magnetic recording / reproducing apparatus for recording / reproducing, maintains the height accuracy of a magnetic head attached with high accuracy, and can be directly attached to a cylinder without adjustment to ensure accuracy. The present invention relates to a method of assembling, a structure of a head base for a magnetic head, a structure of a cylinder, and a manufacturing method capable of ensuring the height accuracy of the magnetic head.

[0002]

2. Description of the Related Art As a technique relating to the structure of a conventional head base of a video head, a method of adhering a magnetic head to a head base, and a method of assembling to a cylinder member, JP-A-60-131611 and JP-A-61-126625 are known.
And Japanese Patent Laid-Open No. 2522114 are known. In these known techniques, after adjusting the position of the magnetic head and adhering it to the head base (see FIG. 2), the height of the magnetic head 3 is measured, and a spacer 21 having a thickness corresponding to the height is sandwiched between the head base and the magnetic head. It was necessary to correct the head 3 so that the height of the head 3 was within a specific range and attach the head 3 to the cylinder 6.

Further, it is necessary to adjust the height of the magnetic head 3 by using the adjusting screw 19 at the time of mounting the cylinder 6 and after mounting it. 3, 4 and 5 show a state in which the video head 1 is attached to the cylinder 6 with the attachment screw 7.

As shown in FIG. 6, while rotating the cylinders so that the difference in the reference heights of the magnetic heads 3 of the video heads 1 mounted around the cylinder 6 falls within a certain range, all of them are rotated. The height of the magnetic head 3 is adjusted. As shown in FIG. 7, the height adjusting screw 1 of the magnetic head 3
By screwing 9 in, the adjusting screw 19 is projected in the arrow A direction, and by pushing the head base 2, the video head 1 can be deformed so as to move the tip of the magnetic head in the arrow B direction. (See FIG. 6) After attaching the video head 1 to the cylinder 6, the reference position 3 of the magnetic head 3 with respect to all the video heads 1 arranged around the cylinder while rotating the cylinder 6.
It was necessary to adjust the adjustment screw 19 so that e was within the reference range 22 (within ± 1 μm).

Since the video head is deformed by assembling it in the cylinder and adjusting the height with the height adjusting screw of the magnetic head, the inclination of the magnetic head, that is, the azimuth angle is also adjusted when the height is adjusted. Was needed.

The height adjustment of the magnetic heads when the video heads are mounted on the cylinder and after the mounting of the video heads is performed by adjusting all the relative heights of the magnetic head portions of the video heads arranged around the cylinder. It was necessary to make adjustments so that it was within 1 μm, but since the direction in which the height can be adjusted is a fixed direction, all relative heights should be adjusted,
In some cases, it may not be possible to make adjustments within ± 1 μm.

Further, it is necessary to perform precision machining on the head base in advance and perform cutting or polishing so as to obtain a predetermined accuracy.

In order to prevent the head base member of the video head from coming into contact with the adjusting screw and being deformed, a further member other than the spacer is sandwiched and the video head is attached to the cylinder, and then the magnetic head of the magnetic head is removed. It was necessary to adjust the height.

As a technique different from the above, Japanese Patent Application Laid-Open No. 1-302
No. 519 is known. This technique measures the positional accuracy of the magnetic head and finishes polishing so that the error is within an allowable range.

[0010]

Even when the magnetic head is attached to the head base with high accuracy, the accuracy of attachment is high due to the poor surface accuracy of the positioning reference surface of the head base and the elastic deformation of the head base with respect to the attachment reference surface. Is difficult to maintain, and it is impossible to reproduce the height accuracy of the magnetic head even if the video head is assembled in the cylinder. Therefore, after the spacer for correcting the height of the magnetic head to a specific range is inserted and assembled in the cylinder, the head base is adjusted again by using the adjusting screw for adjusting the height of the magnetic head again. May be deformed obliquely with respect to the front of the magnetic head, and the azimuth angle of the magnetic head may also be deformed, resulting in a problem that sufficient characteristics cannot be obtained.

Even if the above complicated adjustment is performed, since the height of the magnetic head can be adjusted in a fixed direction, the height of a plurality of video heads mounted around the cylinder is ±. However, there is a problem that it becomes impossible to adjust the thickness to within 1 μm.

Similarly, since the assembly process requires the complicated adjustment work as described above, there are problems such as obstacles to cost reduction and yield improvement.

The present invention has been made in view of the above circumstances, and is a technique for mounting a video head with high accuracy without the need for cutting or polishing and the need for shim adjustment using spacers. The purpose is to provide.

[0014]

The basic principle of the present invention created to achieve the above-mentioned object will be briefly described as follows. That is, in the video head, the surface of the head base member to be attached to the cylinder is pressed, plastically deformed, and then attached while adjusting the height of the magnetic head, whereby the height of the magnetic head is adjusted and attached with high accuracy. be able to.

Further, the shape of the positioning reference surface to which the magnetic head is attached is made equal to the shape of the mounting surface of the cylinder, and at the same time, a member having the same shape as the mounting screw of the video head is used and applied with an equal load. Since the state in which the video head is attached to the cylinder can be reproduced by pressing, it is possible to ensure the reproducibility of the positioning accuracy.

Further, in order to secure the positioning reproducibility when the video head is mounted on the cylinder, the space for the adjusting screw which has become unnecessary is utilized to enlarge the contact area between the video head and the cylinder. By this, the positioning state can be stabilized.

[0017]

By first pressing the head base against the reference block with a large load, the head base can be made to follow the reference block and be plastically deformed.
Next, by reducing the load of the video head to a load equivalent to that for mounting on the cylinder and pressing it, the height of the magnetic head is adjusted and precisely pasted to the head base that has been plastically deformed to be flat in advance. Since the heights of the magnetic head portions of the respective video heads can be reproduced when the video heads are assembled in the cylinder, it is not necessary to adjust the height again, and a means for adjusting the height is not necessary. At the same time, the height accuracy of attaching the magnetic head to the head base does not decrease.

By the above means, it is possible to carry out an assembly and adjustment process which does not require a spacer and an adjustment screw, and the head base is deformed in an unnecessary direction by the adjustment of the magnetic head after the video head is attached to the cylinder,
Does not deform the azimuth angle.

Further, since the assembling process which also requires the complicated assembling and adjusting work can be simplified, the cost can be reduced by reducing the number of assembling members and the number of assembling steps, and the yield can be improved by reducing the adjusting process.

[0020]

Embodiments of the present invention will be described below with reference to FIG. 1 and FIGS. 8 to 12 sequentially. The video head 1 is composed of a head base 2 and a magnetic head 3 as shown in FIG. The magnetic head 3 is bonded and fixed to the positioning surface 2 a of the head base 2 with an adhesive 4. The adhesive 4 is applied on the positioning surfaces 2 a of the magnetic head 3 and the head base 2 by an adhesive applying device (not shown). Reference numeral 5 is a hole for attaching the video head 1 to the cylinder 6 and inserting the screw 7. Reference numeral 8 shown in FIGS. 1, 9 and 10 is a sticking reference block of a magnetic head sticking device (not shown). (See FIGS. 9 and 10) Head base 2
The abutting reference surface block 9 is attached to the attachment reference block 8 with a screw 10 and serves as a positioning reference when the magnetic head 3 is attached to the head base 2. Reference numeral 8a is a relief notch for the magnetic head 3, and 8b is a screw hole. Reference numeral 8c is a reference surface in the height direction of the head base to be attached. Reference numeral 9a is a positioning reference surface that contacts the side surface 2b of the head base 2. Reference numeral 9b is a positioning reference surface that contacts the side surface 2c of the head base 2. Reference numeral 11 denotes a push-up pin that comes into contact with the 2d surface of the head base 2 and presses the head base 2 against the reference surface 8c to plastically deform the head base 2, and a mounting screw 7 that contacts the head base 2 (FIGS. 11 and 12). The tip portion 11a of the push-up pin having the same shape as the above (however, the male screw groove is not cut) is provided.
Reference numeral 12 shown in FIG. 1 is a sliding block for abutting and positioning the side surface 3a of the magnetic head 3 and the front surface 3b of the magnetic head of the magnetic head attaching device (not shown). The side surface 3a of the magnetic head 3 and the side surface 12a of the sliding block 12 are in contact with each other, and the front surface 3b of the magnetic head and the side surface 1 of the sliding block 12 are in contact with each other.
2b is in contact with and positioned.

Reference numeral 13 is a height adjusting plate, which is brought into contact with the lower surface 3c of the magnetic head 3 and tilts the magnetic head 3 up and down by a vertical drive mechanism (not shown) to operate to adjust the reference height position. can do. Reference numeral 14 denotes a magnetic head pressing pin, which contacts the upper surface 3d of the magnetic head 3 and can press the magnetic head 3 from above by a magnetic head weighting mechanism (not shown) to adjust the reference height position.

Reference numeral 15 is a nozzle of an adhesive application device (not shown) for applying the adhesive 4.

Reference numeral 16 is a detection optical system which detects the height reference position of the magnetic head and obtains the difference from the reference block position.

(See FIGS. 11 and 12) On the video head mounting surface 6a of the cylinder 6, there are screw holes 17 for mounting screws of the video head 1 and a notch 18 for escape of the magnetic head.
And are provided.

The push-up pin 11 can be driven in the direction of arrow C (FIG. 1) to plastically deform the head base 2. After the head base 2 is deformed as described above, it is attached to the cylinder 6 in the same manner as in the conventional example (FIGS. 2 to 7). Reference numeral 21 is a spacer provided to correct the height of the video head. A plurality of types of spacers 21 having thicknesses corresponding to the height are prepared so that the height of the video head falls within a certain range. A spacer 21 having an appropriate thickness is selected and sandwiched between the cylinder 6 and the video head 1 for use. Spacer 21 in this embodiment
Is used as a type matching adapter, not an adjustment shim. Reference numeral 21a is a hole for a mounting screw provided in the spacer 21.

In the above structure, the head base 1 is mounted on the sliding guide (not shown) by the head base handling mechanism (not shown), and then the sliding guide is slid to move the head base 1 It moves until it comes into contact with the side surface 9a of the butting reference surface block 9. Then, the side surface 9 of the reference surface block 9 is moved by the front-back direction positioning plate (not shown).
Move until it touches b. Next, the push-up pin 11 moves up in the direction of arrow C and pushes up the head base 1 to complete the positioning in all directions of up, down, front, back, left and right.

By this operation, the head base 1 is pressed against the reference block 9 and the head base 1 is positioned using a mechanism (not shown) for positioning in the X, Y and Z directions, and then the magnetic head 3 is moved to the X position. After adjusting the magnetic head 3 by using a mechanism (not shown) for positioning the magnetic head 3 in the Y, Z direction, a height adjusting plate 13 and a weighting pin for vertically holding the magnetic head 3 against the head base 1 are used. 14, and the measurement optical system 16 is used to measure the reference position 3a of the magnetic head 3 by image processing, and then the height adjusting plate 13 is driven so as to have a height corresponding to the measured value. The height of the magnetic head 3 is adjusted to complete the positioning.

At this time, before sticking the magnetic head 3 positioned with respect to the head base 2 with the adhesive 4 (FIG. 1), the head base 2 is pushed up onto the positioning reference block 8 and the pin 1 is pushed up.
By pressing the head base 2 in the direction of arrow C through 1 with a load capable of plastically deforming, the head base 2 is plastically deformed while being crushed, and is then equivalent to the axial load of the mounting screw 7 mounted on the cylinder 6. Then, the magnetic head 3 is accurately positioned and an adhesive applying device (not shown) is driven to apply and bond the adhesive 4 thereto. After that, the video head 1 with the completed bonding is taken out.

Next, the video head 1 mounting surface 6a of the cylinder 6 having the same shape as the shape of the plastically deformed portion 2a of the head base 2 along the shape of the lower surface 8a of the reference block 8.
By attaching the crushed and plastically deformed portion 2a of the head base 2 of the video head 1 to the video head 1 with the screw 7, the video head 1 can be attached to the cylinder 6 without adjusting the reference position of the magnetic head 3. it can. FIG. 11 is an exploded perspective view of the vicinity of the video head 1,
FIG. 12 is a perspective view of the same. By the above operation,
After attaching the video head 1 to the cylinder 6, the reference position 3a of the magnetic head 3 is within the reference range (± 1 μm) for all the video heads 1 arranged around the cylinder while rotating the cylinder. Was confirmed.

[0030]

As described above, according to the present invention, since a spacer that is sandwiched when assembled into a cylinder and an adjusting screw for adjusting the height after mounting are not required, the number of assembling steps can be significantly reduced, and in the conventional cylinder assembling process. The magnetic head height measuring device for the video head, the spacer thickness measuring device, the spacer feeding device, the spacer and video head pairing device, the adjusting screw feeding device, and other manufacturing and assembling equipment that were required are no longer required. It is effective in reducing the price.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a working state according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a state in which a conventional video head is attached to a cylinder.

FIG. 3 is a partial perspective view of the conventional video head of FIG. 2 with a cylinder attached.

FIG. 4 is an external view of a cylinder to which the conventional video head of FIG. 2 is attached.

5 is a view from the direction of arrow D in FIG.

FIG. 6 is a partial cross-sectional view of a cylinder to which the conventional video head of FIG. 2 is attached.

FIG. 7 is an enlarged view of a partial cross section of FIG.

FIG. 8 is an external perspective view showing an embodiment of the present invention.

FIG. 9 is an exploded perspective view showing a manufacturing preparation situation in one embodiment of the video head of the present invention.

10 is a perspective view showing a state in which positioning of the head base is completed in the manufacturing process of the video head according to the embodiment of FIG.

FIG. 11 is an exploded perspective view for explaining a preparation situation for assembling the video head according to the embodiment of FIG. 8 into a cylinder.

12 is an external perspective view showing a state in which the video head according to the embodiment of FIG. 8 is assembled in a cylinder.

[Explanation of symbols]

1 ... Video head, 2 ... Base head, 2a ... Positioning surface, 2b ... Side surface, 2c ... Side surface, 2d ... Surface, 3 ... Magnetic head, 3a ... Side surface, 3b ... Front surface, 3c ... Lower surface, 3d ... Top surface, 3e ... Reference position, 4 ... Adhesive, 5 ... Hole, 6 ... Cylinder, 6a ... Mounting surface, 7 ... Mounting screw, 8 ... Sticking reference block, 8a ... Notch, 8b ... Screw hole, 8c ... Reference surface,
9 ... Reference block, 9a ... Reference plane, 9b ... Reference plane, 10
… Screws, 11… Push-up pins, 11a… Tip part, 12…
Sliding block, 12a ... Side surface, 12b ... Side surface, 13 ... Height adjusting plate, 14 ... Head pressing pin, 15 ... Tip portion, 1
6 ... Detection optical system, 17 ... Screw hole, 18 ... Notch, 19
... Adjusting screw, 20 ... Screw hole, 21 ... Spacer, 21a ...
Holes for mounting screws, 22 ... Standard range.

Claims (10)

[Claims] 1. A method of manufacturing a cylinder assembly by attaching a head base of a video head to a cylinder, wherein after the mounting surface of the head base is pressed to plastically deform, the height of the magnetic head is adjusted to adjust the magnetic head. A method for manufacturing a cylinder assembly, which comprises adhering to a head base. 2. A method of manufacturing a cylinder assembly by mounting a head base of a video head on a cylinder, wherein the head base is brought into contact with a reference block in advance, and a mounting member and a mounting load equivalent to conditions for mounting on the cylinder are used. A method for manufacturing a cylinder assembly, comprising: pressing to deform the head base, and then adjusting the height of a magnetic head fixed to the head base to bond the magnetic head to the head base. 3. A method of manufacturing a cylinder assembly by mounting a video head on a cylinder, wherein a screw hole for an adjusting screw for adjusting the height of the video head is eliminated, and the height of the video head is adjusted by means other than the adjusting screw. And a portion corresponding to the screw hole is used as a video head mounting contact surface. 4. A method for manufacturing a cylinder assembly by mounting a head base of a video head on a cylinder, wherein a head base mounting surface is previously brought into contact with a reference block,
The head base mounting surface is plastically deformed by pressing with a mounting member and a mounting load equivalent to the conditions for mounting on the cylinder, and the head base is fixed to the head base without using a screw for adjusting the height of the video head. A method of manufacturing a cylinder assembly, wherein the height of a magnetic head is adjusted with an accuracy of ± 1 μm, and the magnetic head is bonded to a head base. 5. An apparatus for manufacturing a video cylinder assembly for magnetic recording and reproducing, wherein the video head is pressed toward a reference block under the same conditions as those of a component part in which the video head is attached to the cylinder. In addition, the cylinder assembly manufacturing apparatus is provided with a pressing means for causing plastic deformation. 6. A video head, wherein a magnetic head is adhered by an adhesive to a head base whose mounting surface for the cylinder is pressed and is plastically deformed flat. 7. A cylinder assembly in which a video head having a magnetic head attached thereto is fixed to a cylinder, the video head having one flat surface portion, one side surface portion, and one side surface portion different from the above. The cylinder assembly is characterized in that a total of three positions are brought into contact with the cylinder and positioned. 8. A cylinder assembly in which a video head having a magnetic head attached to a head base is fixed to a cylinder, and an adjustment screw for adjusting the height of the video head is not provided, and the adjustment is performed. A cylinder assembly, in which a female screw hole for screwing with a screw is not provided, and most of the head base facing the cylinder is in contact with the cylinder. 9. A cylinder assembly in which a head base to which a magnetic head is attached is fixed to a cylinder, wherein the magnetic head is adhered to the head base, and the head base is attached to the cylinder. On the other hand, a cylinder assembly characterized by being fixed without using a spacer member for height adjustment of the magnetic head, and without using screw means for height adjustment of the magnetic head. 10. A cylinder assembly provided with a video head in which a magnetic head is adhered to a video base which is plastically deformed by pressurizing a mounting surface to the cylinder, and a height adjusting means of the video head is not provided. Magnetic recording / reproducing apparatus using.