JPS63149818A - Magnetic head device - Google Patents

Abstract

PURPOSE:To vary the height and tilt of the magnetic head formed to the support member by making the shape of the support member at both ends and narrowing the width from one end toward the other end. CONSTITUTION:In applying a voltage to a piezoelectric element 12 on a base 11, the element 12 is elongated in its longitudinal direction and a compressing force is applied to a support member 13 by supporting an H-shaped middle connection of the base 11. The member 13 is bent in a shape of circular-arc by the compressing force. In this case, since the width of the member 12 is narrower sequentially, the bent shape in the longitudinal direction is different. That is, the narrowest part of the width is deformed largely and the deforming quantity is smaller as the width is wider. As a result, a magnetic head 14 fitted nearly the middle of the member 13 changes its height and the tilt is changed. In applying the voltage with an opposite polarity to above to the element 12, the moving direction of the head 14 is opposite to that stated above.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head device that is effective for use in video tape recorders and the like.

Prior Art FIG. 7 is a plan view of a conventional magnetic head device, FIG. 8 is a front view of the same device, and FIG. 9 is a partially enlarged view of the same device. To explain this, 71 is an H-shaped base made of a thin plate, 72 is a piezoelectric element that expands and contracts in the longitudinal direction when energized, and 73 is fixed across one both ends of the H-shaped base 71, and is made of a spring. 74 is the support member 73
A magnetic head is fixed at the center of the head and records and reproduces signals.

The operation of the conventional magnetic head device configured as described above will be described below.

The piezoelectric element 72 fixed across one end of the H-shape of the base 71 is alternately energized to expand and contract in the longitudinal direction.
The base 71 is attached to a support member 73 with a magnetic head 74 fixed to the center, using the H-shaped central connecting portion of the base 71 as a fulcrum.
A force is applied through the support member 73, causing the support member 73 to vibrate in the direction of the arrow shown in FIG. 8 (direction perpendicular to the tape). By the above-mentioned function, the relative height of the magnetic head 74 with respect to the tape (not shown) can be changed, and the track recorded on the tape can be accurately tracked.

Problems to be Solved by the Invention However, in the above configuration, as shown in FIG.
Although the height of the magnetic head 4 can be changed, the inclination cannot be changed, and if the azimuth of the track and the magnetic head are misaligned, the inclination cannot be corrected. Another problem is that it is not suitable for applications where the azimuth of the magnetic head needs to be changed depending on its height.

In view of the above problems, the present invention provides a magnetic head device in which the height and inclination of the magnetic head can be changed.

Means for Solving the Problems In order to solve the above problems, the magnetic head device of the present invention includes an H-shaped thin plate base, and a piezoelectric device fixed across one end of the H-shape of the base. the element, a thin plate support member having spring properties fixed across the other ends of the base, and a magnetic head fixed approximately at the center of the support member for recording and reproducing signals, and The width of the support member is gradually narrowed, and a magnetic head is provided approximately in the center of the support member in the longitudinal direction.

Operation The present invention provides a magnetic head device having the above-described configuration, in which the height of the magnetic head can be varied and the inclination thereof can be varied.

Embodiment A magnetic head device according to a first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of the magnetic head device of this embodiment, FIG. 2 is a front view of the same, and FIG. 3 is a partially enlarged view of the same.

11 is an H-shaped base made of a thin plate, 12 is a piezoelectric element that expands and contracts in the longitudinal direction by applying alternating current, and 13 is an H-shaped base.
A supporting member 14 is fixed to one end of a base 11 having a shape such that its width becomes gradually narrower and has a spring property. It is a magnetic head that performs.

The operation of the magnetic head device of this embodiment configured as above will be explained. By applying a voltage to the piezoelectric element 12 on the base 11, the piezoelectric element 12 expands in its longitudinal direction, supports the H-shaped central connection part of the base 11, and applies a compressive force to the support member 13. Ru. This compressive force causes the support member 13 to bend in a circular shape. At this time, the support member 13
Since the width of the shape is gradually narrowed, the shape of the deflection in the longitudinal direction is different. That is, the part with the narrowest width is greatly deformed, and the widest part has a different amount of deformation.

As a result, the height position of the magnetic head 14 mounted approximately at the center of the support member 13 changes, and at the same time its inclination also changes. When the voltage applied to the piezoelectric element 12 is removed, the magnetic head 14 returns to its original state. Furthermore, if a voltage with a polarity opposite to that described above is applied to the piezoelectric element 12, the moving direction of the magnetic head 14 becomes opposite to that described above.

A second embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a plan view showing a second embodiment of the present invention, FIG. 5 is a front view showing the same embodiment, and FIG. 6 is a partially enlarged view showing the same embodiment.

In the figure, 41 is an H-shaped base made of a thin plate, 42 is a piezoelectric element that expands and contracts in the longitudinal direction when energized, and 4
Reference numeral 3 indicates a support member fixed across one both ends of the H-shaped base 41, and reference numeral 46 indicates a U-shaped notch provided at a location narrower than the width of the approximately central portion of the support member 43.

The operation of the magnetic head device of this embodiment configured as above will be explained.

The support member 43 has a notch portion 45 as shown in FIG. 4, which makes this portion more flexible.

Therefore, the magnetic head 14 has a larger change in inclination than in the case shown in FIG. As described above, according to this embodiment, the shape of the support member gradually narrows its width. By providing a U-shaped notch at a location narrower than the width in the longitudinal direction and attaching the magnetic head approximately at the center of the support member, the amount of deflection of the support member can be reduced as shown in FIGS. 3 and 6. varies depending on its longitudinal position, and the narrow portions of the support member flex largely. As a result, a magnetic head device is realized in which the height of the magnetic head changes and the amount of inclination of the magnetic head can also be varied.

Effects of the Invention As described above, the present invention has a configuration in which the shape of the support member is different at both ends and narrows from one end to the other, thereby improving the magnetic head formed on the support member. In addition to making the height variable, the inclination of the magnetic head can also be made variable.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the magnetic head device according to the embodiment of the present invention shown in FIG. 1, FIG. 2 is a front view showing the same device, FIG. A plan view showing a magnetic head device according to a second embodiment of the present invention, FIG. 6 is a front view showing the device, FIG. 6 is a front view of main parts of the device, and FIG. 7 is a conventional magnetic head device. FIG. 8 is a front view of the device, and FIG. 9 is a front view of main parts of the device. 11.41...Heath, 12.42...
・Piezoelectric element, 13, 43... Support member, 14.
...Head chip, 45...U-shaped notch. Name of agent: Patent attorney Toshio Nakao and 1 other person11
---＼-ス／2--7I电子集乹Fig. 7Fig. 9

Claims (2)

[Claims] (1) An H-shaped metal base, a piezoelectric element fixed to one side of the H-shape of the metal base, and an elastic thin plate support member fixed to the other side of the metal base. and a magnetic head device comprising a magnetic head for recording and reproducing signals on the supporting member, wherein the supporting member has a width that is successively narrowed, and the magnetic head is provided at an approximately central portion in the longitudinal direction of the supporting member. A magnetic head device characterized in that by providing a head, the height of the magnetic head and its inclination angle can be changed. (2) The magnetic head device according to claim 1, wherein the support member is provided with a U-shaped small cutout at a location narrower than the width of the approximately central portion of the support member in the longitudinal direction.