JPH0543311U - Magnetic head - Google Patents

Abstract

(57) [Summary] [Purpose] To set the gap positional relationship between head chips in a double azimuth head with high accuracy. [Structure] Two head chips 11A and 11B having different azimuths of magnetic gaps from each other on a head base 12
In a magnetic head having a double azimuth head composed of two head chips 11A and 11B.
A height adjusting mechanism 14 that independently adjusts the height position of 1B in the gap width direction is provided. The height adjusting mechanism 14 divides each of the projecting pieces 13 for mounting the head chips 11A and 11B of the head base 12 into two parts with a gap 15 in the thickness direction.
The adjusting screw 16 is screwed into the one plate portion 13A to be formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic head mounted on a rotary drum of a magnetic recording / reproducing apparatus such as a VTR.

[0002]

[Prior Art]

 Generally, in a VTR, a magnetic head is attached to a rotating drum. A head chip 1 [1A, 1B] that constitutes a magnetic head is attached to a metallic head base 2 as shown in FIGS. 5A and 5B, and is particularly attached to a projecting piece 3 at the tip. Then, the head base 2 supporting the head chip 1 is fixed to a rotating drum (not shown) by screws or the like.

Further, in a VTR that performs variable speed reproduction, as shown in the same figure, azimuths of magnetic gaps g ₁ and g ₂ (see FIG. 6) are respectively formed on the projecting pieces 3 that are split into two at the tip of the head base 2. Two head chips 1A and 1B differing from each other are attached, and the two head chips 1A and 1B form a double azimuth head.

[0004]

[Problems to be solved by the device]

In such a double azimuth head, as shown in FIG. 6, the difference between the dimensions a and b from the mounting surface of the head base 2 of the two head chips 1A and 1B to the edges of the gaps g ₁ and g ₂ , that is, d It is necessary to set the value within a predetermined size range, for example, in the case of 8 mm video, within a range of 1 μm or less.

By the way, since the values of a and b vary when manufacturing the head chip 1 [1A, 1B], the head chip 1 is ranked according to the sizes of a and b, and the same size. These are assembled into a pair and joined to the head base 2. However, in order to rank the head chips 1 in this manner, it is necessary to manufacture separate head chips 1 and it is necessary to select them, which requires labor for assembling the heads and is costly. There was a defect such as.

In view of the above points, the present invention provides a double azimuth head capable of more accurately controlling the position between two head chips and capable of assembling even if the head chip processing accuracy is not so good. A magnetic head is provided.

[0007]

[Means for Solving the Problems]

According to the present invention, two head chips 11A and 11B having different azimuths of magnetic gaps g ₁ and g ₂ are fixed to a head base 12, and the two head chips 11A and 11B form a double azimuth head. In the head, the head base 12 is provided with a height adjusting mechanism 14 for independently adjusting the height positions of the head chips 11A and 11B in the gap width (so-called track width) direction.

[0008]

[Action]

 In the magnetic head 20 according to the present invention, the head base 12 is provided with the height adjusting mechanism 14 for independently adjusting the height positions of the head chips 11A and 11B in the gap width direction. After mounting on the rotary drum 19 of the VTR, the height position of each head chip 11A and 11B in the gap width direction can be adjusted by the height adjusting mechanism 14, so that the height position between the two head chips 11A and 11B can be adjusted. The gap position, that is, the value of d described above (see FIG. 6) can be accommodated within a predetermined accuracy.

Therefore, it becomes unnecessary to assemble head chips having similar dimensions in pairs as in the prior art, and the positional relationship between the two head chips can be set with high accuracy even if the processing accuracy of the head chips is not so good. Then, the magnetic head can be assembled.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to FIGS. In this example, as shown in FIG. 1 and FIG. 2, in addition to forming two split projecting pieces 13 for mounting the head chips 11 [11A, 11B] at the front end of a metal head base 12, A height adjusting mechanism 14 for adjusting the height of the head chips 11A and 11B in the gap width (track width) direction is formed on each of the protruding pieces 13. That is, each protrusion 13 is divided into two parts so as to form a predetermined gap 15 in the thickness direction, and the adjusting screw 16 is screwed into one plate part 13A on the side to which the head chip 11 is directly attached. To form the height adjusting mechanism 14.

In this case, the tip of the adjusting screw 16 screwed into the one plate portion 13A to which the head chip 11 is attached is brought into contact with the other plate portion 13B, and the adjusting screw 16 is rotated. Then, one plate portion 13A is elastically deformed and the height h of the head chip 11 is finely adjusted with respect to the other plate portion 13B. Reference numeral 17 is a screw hole for attaching to the rotary head.

Then, two head chips 11A and 11B having different azimuths of the magnetic gaps g ₁ and g ₂ can be mounted on one plate portion 13A of each projecting piece portion 13 of the head base 12. Then, as shown in FIG. 3, the head base 12 is fixed by screws 18 to the lower surface of the rotating drum, for example, the upper rotating drum 19, so that the other plate portion 13B comes into contact with the rotating drum 19. After fixing the head base 12 to the upper rotary drum 19, each adjusting screw 16 is independently rotated to adjust the height h from the other plate portion 13B of the head chips 11A and 11B. That is, the value of d in FIG. 6 described above is adjusted to fall within a predetermined range.

After the height h of the two head chips 11A and 11B is adjusted, the adjusting screw 16 may be fixed with, for example, an instant adhesive in order to increase the stability.

Here, by appropriately adjusting the dimensions of the thickness α of the one plate portion 13A, the width β of the gap 15 and the thickness γ of the other plate portion 13B, and using the fine screws 16, finer Adjustment is possible.

According to the above-mentioned configuration, the two projecting piece portions 13 to which the head chips 11A and 11B at the tip of the head base 12 are attached are provided on the two plate portions 13A and 13B with a gap 15 in the thickness direction. A magnetic head 20 having two head chips 11A and 11B mounted on a head base 12 is formed by dividing and height adjusting mechanism 14 by screwing adjusting screws 16 into one plate portion 13A. After mounting on the rotating drum, for example, the upper rotating drum 19, by rotating the respective height adjusting screws 16, the gap positions of the two head chips 11A and 11B can be matched within a predetermined accuracy. ..

Therefore, it is not necessary to assemble a pair of head chips having the same accuracy dimension and attach them to the head base as in the conventional case, and the head chips can be assembled even if they are not so accurate.

In the above example, the head base 12 in which each protrusion 13 is divided into two in the thickness direction is manufactured as an integral body. However, as shown in FIG. 4, for example, as shown in FIG. It is also possible to configure the head base 13 according to this embodiment with a composite substrate in which three metal plates 22A, 22B, and 22C each having γ are stacked.

Further, although the present invention is applied to the double azimuth head in the above example, it can also be applied to, for example, a multi-channel video head in which a plurality of head chips are attached to one head base. The interval (step) can be adjusted accurately.

[0019]

[Effect of the device]

 According to the present invention, the position of the magnetic gap of each head chip of the double azimuth head can be independently adjusted with high accuracy by the height adjusting mechanism provided on the head base. Further, this eliminates the need for conventional head chip pairing and eases the strictness of head chip processing accuracy, and facilitates the manufacture of this type of magnetic head.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a magnetic head of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view of the magnetic head of the present invention mounted on a rotary drum.

FIG. 4 is a sectional view showing another example of the magnetic head of the present invention.

FIG. 5A is a plan view of a conventional magnetic head.
(B) is a side view of a conventional magnetic head.

FIG. 6 is an enlarged view of a gap portion of a magnetic head.

[Explanation of symbols]

 1A, 1B, 11A, 11B Head chip 2,12 Head base 3,13 Projection piece part 14 Height adjustment mechanism 16 Adjustment screw 20 Magnetic head

Claims (1)

[Scope of utility model registration request] 1. A magnetic head in which two head chips having different azimuths of magnetic gaps are fixed to a head base, and a double azimuth head is constituted by the two head chips. A magnetic head having a height adjusting mechanism for independently adjusting the height position in the gap width direction.