JPH0393022A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent the change of an azimuth angle as far as possible when the heights of two head chips are adjusted and to independently adjust the heights of respective chips by forming a groove which is parallel to a head scanning direction at a prescribed part in a head base. CONSTITUTION:Fitting arms 2A and 2B, both of which are divided by a slit 3, are formed on one side of the head base 1, and the head chips 5A and 5B are respectively loaded on respective arms. A hole 4 for fitting the base 1 to a rotary drum by a fitting screw 10 is formed on the other side of the base 1 and at least on of the arms 2A and 2B is compulsorily displaced in the fitting state of the base 1 to the rotary drum so as to adjust the heights of the chips 5A and 5B. The groove 8 which is parallel to the head scanning direction is formed in an intermediate part between the point of application for force added to the base 1 and the hole 4 for adjusting the heights of the chips 5A and 5B. Thus, the base 1 is bent and displaced along the groove 8 and the arms 2A and 2B are displaced without torsion.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a video tape recorder (hereinafter referred to as VTR).
It relates to a double azimuth type magnetic head (hereinafter abbreviated as DA head) mounted on a rotating cylinder, and more specifically, two head chips are mounted on one head base, and the head base is displaced ( This invention relates to the structure of a head base in a magnetic head in which the height of the head chip can be adjusted by bending the head base.

[Conventional technology]

Recently, in VTRs, the above-mentioned DA heads have come into widespread use in order to improve image quality during special playback, standard recording/playback mode, and long-time recording/playback mode. The head is, for example, JP-A-62-205.
This method is disclosed in Publication No. 515, Japanese Utility Model Application Publication No. 63-6509, etc. FIGS. 9 to 14 are diagrams showing such conventional DA heads.

In Fig. 9, l is a head base, from which mounting arms 2A and 2B are protruded and formed on one side, and mounting holes 4 are bored on the other side, and both mounting arms 2
A and 2B are divided by a slit 3. 5A,
Reference numeral 5B denotes a head chip, which is fixed to the tips of the mounting arms 2A and 2B by suitable adhesive means, respectively.
The bed chips 5A and 5B are each made of a pair of half-core cores joined by butting each other on the front side and the core side, and have operating gaps 6 and 6 formed on the front side, respectively. Note that 7 and 7 are each head chip 5A.
, 5B, respectively. As shown in FIG. 10, the head base 1 is attached to a holding part 12 of a rotary cylinder earthwork by means of attachment screws 10 inserted into the attachment holes 4. Then, by pushing the head base l downward as shown in FIG. 10 using the adjustment screw 13 screwed into the holding part 12, the top of the head base is forcibly displaced (deflected), and the head tip 5A, The height of 5B was set to be 11!1.

[Problem to be solved by the invention]

FIG. 11 is an enlarged and exaggerated perspective view showing the deformation of the head base 1 when the adjustment screw 13 applies the pressing force A to the portion S1 on the head base 1, and FIG. This is an explanatory diagram of the main parts seen from the Y direction. Also, the first
Figure 3 also shows that a pressing force B is applied to the part S2 on the head base 1.
14 is an enlarged and exaggerated perspective view showing the deformation of the head base 1 when the adjustment screw 13 acts, and FIG. 14 is an explanatory view of the main part of FIG. 13 viewed from the Y direction.

As is clear from FIGS. 12 and 14, when a pressing force is applied, one head tip (here head tip 5)
Along with the displacement in the height direction of B), the other head chip (Head chip 5A in this case) is also displaced in the height direction, causing the problem that the other head chip is displaced from the adjusted position. That is, there is a problem in that the height mu of one head tip also affects the height of the other head tip, making adjustment extremely difficult. Furthermore, as shown in FIGS. 12 and 14, the azimuth angle of the head tip has changed after deformation (solid line) compared to the state before deformation shown by dotted lines, and this change in azimuth angle If it is large, there is a problem that the azimuth loss during compatible playback may cause a decrease in output or deterioration of frequency characteristics in the future.

The present invention was made in view of the above points, and its purpose is to prevent azimuth angle changes as much as possible when adjusting the heights of two head tips, and to adjust the height of each bed tip. It is possible to adjust the head tip independently without affecting the other, which makes it possible to precisely adjust the height of the head tip.
An object of the present invention is to provide a head base structure for a magnetic head that can be easily constructed.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention includes two mounting arms divided by a slit on one side of a head base, a head chip is mounted on each mounting arm, and a head chip is mounted on each mounting arm. A mounting hole for mounting the head base to the rotating drum with a mounting screw is formed on the other side of the base, and when the head base is mounted to the rotating drum, at least one of the mounting arms is forcibly displaced. In the magnetic head configured to adjust the height of the head chip, a point of application of a force applied to the head base for height adjustment of the head chip and the mounting hole are provided. A groove parallel to the head scanning direction is formed in the middle part of the head.

[Effect]

With the above structure, when a pressing force is applied to the head base to adjust the height of the head chip, no matter where the point of application of the force is with respect to the mounting arm, the head base will not be able to perform head scanning. Due to the presence of the groove formed parallel to the direction, the mounting arm tends to be bent and displaced along the groove, so that the mounting arm is displaced with almost no twisting. Therefore, since the head chip on the mounting arm is displaced only in the vertical direction, changes in the azimuth angle due to height adjustment of the head chip can be avoided as much as possible. In addition, the presence of the groove reduces torsional stress on the head base, and the presence of the slit that reaches the groove makes the displacement movements of the two mounting arms independent of each other. It becomes possible to adjust the height independently without affecting the other.

〔Example〕

Hereinafter, the present invention will be explained with reference to illustrated embodiments. 1st
4 to 4 relate to one embodiment of the present invention, FIG. 1 is a perspective view of a DA head (double azimuth type magnetic head) with a head chip mounted on a head base, and FIG. 2 is a perspective view of a DA head (double azimuth type magnetic head).
A cross-sectional side view of the main parts with the head attached to the rotating cylinder,
FIG. 3 is an enlarged and exaggerated perspective view showing the deformation of the head base when a deformation pressing force is applied to the head base, and FIG. 4 is an explanatory view of the main parts seen from the Y direction of FIG. 3.

In each case, 1 is the head base, 2A and 2B are the mounting arms, 3 is the slit, 4 is the mounting hole, 5A and 5B are the head chips, 6 is the operating gap, 7 is the coil, 10 is the mounting screw, and 11 is the rotating cylinder. , 12 is a holding part, 13
is an adjustment screw, and since these members and parts are equivalent to the conventional structure shown in FIGS. 9 to 14 described above, their explanation will be omitted to avoid duplication.

In the present invention, as shown in FIG. 1, a groove 8 parallel to the head scanning direction S is formed on one side of the head base l. This groove 8 completely traverses from one side of the head base 1 to the other side so as to partition between the point of application of the pressing force applied to the head base 1 by the adjustment screw 13 and the mounting hole 4. In this embodiment, the groove 8 has a substantially V-shaped cross section. Further, the penetrating slit 3 that is perpendicular to the groove 8 is arranged to intersect with the groove 8, so that the head chips 5A and 5B on both the mounting arms 2A and 2B are connected to the slit 3, respectively. and groove 8 allow for independent displacement. The head base 1 is equipped with head chips 5A and 5B.
As shown in FIG. 2, the base side thereof is fastened and held by the mounting screw 10 to the mounting portion l2 of the rotary cylinder 1l as before. In the attached state, the head base 1 is connected to the groove 8 and the head tip 5A.
Or, the intermediate part between the mounting part of 5B and the mounting part 1 is
The push-down force is applied by appropriately rotating the adjustment screw 13 screwed into the screw 2. and,
As a result, a predetermined portion of the head base 1 is displaced (bending), and the height of the head chip 5A or 5B on the mounting arm 2A or 2B is adjusted.

Now, as shown in Fig. 3, the part S on the head base 1 is
1, or even if pressing force B is applied to the region S2 on the head base 1 (in other words, one region separated by the slit 3 and the groove 8). , even if a pressing force is applied to any part within the hatched area), the mounting arm 2B is displaced substantially vertically with almost no twisting. That is, when a pressing force is applied to the hatched portion of the head base 1, the groove 8 bends along the groove 8 (mainly the portion of the groove 8 that is easily deformed), and is bent onto the mounting arm 2B. As shown in FIG. 4, the head chip 5B changes only the position in the height direction from the position shown by the dotted line to the position shown by the solid line without changing the azimuth angle. In addition, since the area that deforms when receiving the pressing force for height adjustment of the head chip 2A or 2B is separated by the slit 3 and the groove 8 and deforms independently (the displacement operation of the mounting arms 2A, 2B is As shown in FIG. 4, even if the height of one head chip 5B is adjusted, there is almost no possibility that the other head chip 5A will be displaced.

In this embodiment having such a configuration, the heights of the two head chips can be adjusted independently without affecting the other head chips and without changing the azimuth angle. work efficiency is significantly improved.

Note that the above-described groove of the present invention can be modified in various ways other than the embodiment described above, such as a groove 8A having a rectangular cross section as shown in FIG. 5, or a substantially U-shaped cross section as shown in FIG. 18 of
Alternatively, as shown in FIG. 7, a plurality of grooves 8, 8 may be arranged close to each other on the same surface, or alternatively, as shown in FIG. 8,8
It may also be formed by

〔Effect of the invention〕

As described above, according to the present invention, in a double azimuth type magnetic head, the height tAs of two head chips can be adjusted without fear of changing the azimuth angle, and this can be adjusted without affecting the positions of other head chips. It becomes possible to perform this independently on each head chip without giving any Therefore, the height adjustment work of the head chip becomes easy and reliable, and a high-performance magnetic head can be provided with high productivity, and its industrial value is high.

[Brief explanation of drawings]

1 to 4 relate to an embodiment of the present invention, in which FIG. 1 is a perspective view of a double azimuth type magnetic head (DA head) with a head chip mounted on a head base, and FIG. 2 is a perspective view of a DA head. FIG. 3 is a cross-sectional side view of the main part of the head attached to the rotating cylinder, FIG. 3 is an explanatory diagram of the main part viewed from the Y direction, FIGS. 5 to 8 are side views of the head base according to other embodiments of the present invention, and FIGS. 9 to 14 are related to the conventional example. FIG. 9 is a perspective view of the DA head, FIG. 10 is a cross-sectional side view of the main parts of the DA head attached to a rotating cylinder, and FIG. Fig. 1 is an enlarged and exaggerated perspective view showing the deformation of the head base when a pressing force is applied to the part S1 on the head base, and Fig. 12 is a perspective view showing the deformation of the head base when a pressing force is applied to the part S1 on the head base. ．． Fig. 13 is an explanatory diagram of the main parts seen from the Y direction, and Fig. 13 is a perspective view showing an enlarged and exaggerated deformation of the head base when a pressing force is applied to the part S2 on the head base.
The figure is an explanatory view of the main parts of Figure 13 viewed from the Y direction. 1・
...Head base, 2A, 2B...Mounting arm, 3...Slit, 4...Mounting hole, 5A,
5B...head chip, 6...operating gap, 7...coil, 8,8
A, 8B...Groove, 10...Mounting screw, ■1...Rotating cylinder, 12...Mounting part, l3...Adjustment screw. No./Kuni No. 2//: TEJ turn゛)nγ /2: Watamata Isuri {p /U: Hankarei year Pu No.] Item l No. 6 No. Otsu No. 7 No. 8 No. 7 country/θ country

Claims (1)

[Claims] 1. One side of the head base is divided by a slit.
two mounting arms are formed, a head chip is mounted on each of the mounting arms, and a mounting hole is formed on the other side of the head base for mounting the head base to the rotating drum with a mounting screw,
In the magnetic head, the height of the head chip can be adjusted by forcibly displacing at least one of the mounting arms when the head base is attached to the rotating drum. 1. A magnetic head, characterized in that a groove parallel to the head scanning direction is formed at an intermediate portion between a point of application of force applied to the head base and the mounting hole to adjust the height of the head chip. 2. The magnetic head according to claim 1, wherein the groove parallel to the head scanning direction intersects the slit. 3. The magnetic head according to claim 1, wherein a plurality of grooves are formed parallel to the head scanning direction. 4. The magnetic head according to claim 1, wherein the grooves parallel to the head scanning direction are formed on both sides of the head base.