JPH03116514A - Magnetic head device - Google Patents

Abstract

PURPOSE:To simplify fabrication and to improve workability in assembling by mounting a piezoelectric element on the mounting surface of a mounting plate, opposing the mounting surface to the mounted body and interposing an adjusting member between the mounting surface and mounted body. CONSTITUTION:The mounting plate 10 having a mounting surface 10a carrying a piezoelectric element 2 and opposed to a mounted body and a recess 10b for guiding the movement of a magnetic head through the element 2 while allowing the expansion and contraction of the element 2 and the adjusting members 11a and 11b interposed between the mounting surface 10a and the mounted body and used for setting the mounting position of the magnetic head are provided. In this case, the head position is precisely adjusted only by interposing the members 11a and 11b between the mounting surface 10a carrying the element 2 and the mounted body. Consequently, the fabrication of the mounting plate is simplified, and assembling is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a magnetic head device mounted on, for example, a video tape recorder (VTR).

(Prior Art) In general, in a VTR, when performing special reproduction of still images and triple speed, etc., the magnetic head is used to pick up signal tracks spanning several fields recorded on the recording medium with the magnetic head. The playback output level fluctuates greatly,
Noise bars may appear on the screen. For this reason, conventionally, VTRs have been equipped with so-called dynamic tracking type magnetic head devices that drive and control the magnetic head in a direction substantially perpendicular to the head tracing direction of the recording medium. Such a magnetic head device implements drive control of the magnetic head by mounting the magnetic head on one end of a piezoelectric element and driving the piezoelectric element to expand and contract.

Figure ff15 shows such a conventional magnetic head device. In the figure, 1 is a magnetic head having a prescribed track width, magnetic cap, and gap depth, and as shown in Figure 6, one end of the piezoelectric element 2 will be installed on. This piezoelectric element 2 has a metal plate electrode 2a, which serves as a common electrode, made of an elastic Ni-Fe alloy, etc.
A pair of piezoelectric materials having metal film electrodes 2d and 2e such as NI are sandwiched on one side of ceramic plates 2b and 2c made of lead), etc., and an organic resin (not shown) is placed on the metal film electrodes 2d and 2e. The magnetic head 1 is mounted through an insulating film such as the like. The piezoelectric body constituting these piezoelectric elements 2 includes a metal plate electrode 2a and a metal film electrode 2 sandwiching the ceramic plates 2b and 2c.
d and 2e each form a pair of electrodes. These metal plate electrodes 2a and metal film electrodes 2d, 2e are connected to a drive circuit (not shown), respectively, and the ceramic plates 2b, 2c are connected to arrows A.

The magnetic head 1 mounted on one end of the piezoelectric element 2 is driven and controlled in the direction of the arrow substantially perpendicular to the head tracing direction by being driven to expand and contract in the B direction.

The piezoelectric element 2 is attached to a mounting body, for example, a cylinder 4, via a mounting plate 3 for installation. This mounting plate 3 has a concave piezoelectric element mounting portion 3a as shown in FIGS. 7 and 8.
is formed to have substantially the same thickness as the piezoelectric element. The bottom surface of this piezoelectric element mounting portion 3a forms a first mounting surface 3b for mounting the piezoelectric element, and the end surface forms a second mounting surface 3b for mounting the piezoelectric element.
form a mounting surface 3c. And piezoelectric element mounting part 3a
Four parts 3d are formed at predetermined positions to allow the piezoelectric body 2 to be driven to expand and contract and to guide the drive in a direction substantially perpendicular to the head tracing direction of the magnetic head 1.

When the piezoelectric element 2 is attached to the cylinder 4 using the mounting plate 3, as shown in FIG.
Place the piezoelectric element 2 on the first mounting surface 3b of the piezoelectric element mounting portion 3a using the adjustment plate 5 for position adjustment, and then tighten the screw 6 with the piezoelectric element 2 corresponding to the second mounting surface 3C. (See Figure 7). The mounting plate 3 to which the piezoelectric element 2 is mounted is mounted using screws 6 with its second mounting surface 3C facing the cylinder 4 (see FIG. 5).

At this time, an adjusting plate 7 for adjusting the position of the magnetic head is set between the second reference surface 3C of the mounting plate 3 and the cylinder as necessary (see FIG. 9).

With the above configuration, the magnetic head 1 corresponds to the track position of a recording medium (not shown), and for example, when performing special reproduction of a recorded image on a recording medium (not shown), first, the metal plate electrode 2a of the piezoelectric element 2 and the metal film A predetermined amount of voltage is applied to the electrodes 2d and 2e via the drive circuit (not shown), and the polarity of the voltage is selectively and variably controlled. Then, the piezoelectric element 2 is driven to expand and contract in the directions of arrows A and B, and one end to which the magnetic head 1 is attached is controlled to move up and down. As a result, the magnetic head 1 is driven and controlled in the direction of arrow C, which is substantially perpendicular to the head tracing direction of a recording medium (not shown). On this occasion,
The piezoelectric element 2 is driven and controlled so that the reproduction output of the magnetic herad 1 is maximized. Thereby, the magnetic helad 1 obtains a noiseless reproduced image of the image recorded on the recording medium (not shown).

However, in the magnetic head device described above, in order to attach the piezoelectric element 2 to the cylinder 4, the piezoelectric element 2 is housed in the piezoelectric element mounting portion 3a of the mounting plate 3, and the piezoelectric element 2 is placed between the piezoelectric element 2 and the first mounting surface 3b. After adjusting the position to correspond to the second mounting surface 3C using the adjustment plate 5, the position of the magnetic head 1 must be adjusted with respect to the cylinder 4 using the adjustment plate 7 while installing it. Therefore, there was a problem in that the assembly work was extremely troublesome. Further, according to this, since the first and second mounting surfaces 3b and 3c, which have a correlation with the mounting plate 3 and require high manufacturing accuracy, must be formed, the manufacturing process becomes difficult. This has the problem of being extremely troublesome.

(Problems to be Solved by the Invention) As described above, conventional magnetic head devices have problems in that assembly work is extremely troublesome and manufacturing of its component parts is extremely troublesome. .

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a magnetic head device that has a simple structure, simplifies manufacturing, and improves assembly workability. do.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes a piezoelectric element in which a pair of stretchable piezoelectric bodies each having a metal film electrode formed thereon are stacked together via a metal plate electrode, and a magnetic head is attached to one end of the piezoelectric element. In a magnetic head device, the piezoelectric element is mounted and driven to expand and contract through a drive circuit, and the magnetic head is driven and controlled in a direction substantially perpendicular to a head tracing direction of a recording medium. A mounting surface for mounting on the body, on which the piezoelectric element is placed and facing the mounting body via the piezoelectric element, and a mounting surface provided corresponding to the mounting surface to allow expansion and contraction of the piezoelectric element. and an adjustment member interposed between the mounting surface of the mounting plate and the mounting body to set the mounting position of the magnetic head. It is composed of

(Function) According to the above configuration, when a piezoelectric element is to be mounted on a mounting body, the piezoelectric element is first placed and mounted on the mounting surface of the mounting plate, and then the mounting surface of the mounting plate is placed opposite to the mounting body. By interposing an adjusting member between the mounting surface and the mounting body, the mounting position of the magnetic head mounted on the piezoelectric element is adjusted and mounted.

Therefore, by forming a mounting surface and a recess on which the piezoelectric element is mounted on the mounting plate, and interposing an adjustment member between the mounting surface on which the piezoelectric element is mounted and the mounting body, accurate head position adjustment can be achieved. By realizing this, it is possible to simplify the production of the mounting plate, and also to simplify the assembly work.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the main parts of a magnetic head device according to an embodiment of the present invention, and numeral 10 in the figure is a mounting plate 10 for installing a piezoelectric element, which is a feature of the present invention. This mounting plate 1
The piezoelectric element 2 shown in FIG.
installed at a predetermined location. Therefore, the same parts as in FIGS. 5 and 6 are designated by the same reference numerals, and their explanation will be omitted.

That is, a mounting surface 10a for mounting a piezoelectric element is formed on one side of the mounting plate 10, and a recess 10b for driving guide is formed on this mounting surface 10a in correspondence with the magnetic head 1 of the piezoelectric element 2. A first mounting hole 10c for mounting a piezoelectric element and a second mounting hole 10d for installing a mounting body are formed on the mounting surface 10a of the mounting plate 10 at a predetermined interval.

This second mounting hole 10d has a mounting surface 10a and a cylinder 4.
An adjustment member 11a for position adjustment is interposed therebetween.

11b is attached. This adjustment member 11a.

11b is formed, for example, in the shape of an abbreviation so as to correspond to the metal surface portion on the mounting surface 10a of the mounting plate 10 on which the piezoelectric element 2 is not placed.

In the above configuration, when mounting the piezoelectric element 2 to the cylinder 4, first place the base end of the piezoelectric element 2 at a predetermined position on the mounting surface 10a of the mounting plate 10, and
The screw 12 is screwed in and installed using 0c. Next, the mounting plate 10 to which the piezoelectric element 2 is attached has its mounting surface 10a facing the cylinder 4, and its mounting surface 10a
An adjusting member 11a is provided between the cylinder 4 and the cylinder 4.

11b is interposed, and is attached to the cylinder 4 using the second attachment hole 10d. At this time, the adjustment members 11a, ll
b is selectively used to have a predetermined thickness so that the magnetic head 1 of the piezoelectric element 2 has a desired track position with respect to a recording medium (not shown).

As described above, in the above magnetic head device, the piezoelectric element 2 is placed on the mounting plate 10, and the mounting surface 10a1 facing the cylinder 4 via the piezoelectric element 2 is provided corresponding to the mounting surface 10a. , four parts 10b are provided to allow expansion and contraction of the piezoelectric element 2 and guide the drive of the magnetic head 1, and the magnetic head 1 is provided between the mounting surface 10a of the mounting plate 10 and the cylinder 4.
The magnetic head 1 is configured to be attached to a predetermined position of the cylinder 4 by interposing adjusting members 11a and llb for setting the attachment position of the magnetic head 1. According to this, mounting plate 1
An adjustment member 11a is formed between the mounting surface 10a and the cylinder 4 by forming a mounting surface 10a on which the piezoelectric element 2 is mounted and a recess 10b.

By interposing the head 11b, accurate head position adjustment can be achieved, and the mounting plate 10 can be simplified and manufactured easily, as well as its assembly work can be simplified.

In addition, in the said Example, the adjustment member 11a.

Although the adjustment member 11b is configured to come into contact with the surface metal part on the mounting surface 10a where the piezoelectric element 2 is not located, the adjustment member 13a is not limited to this, and for example, the adjustment member 13a corresponding to a part of the mounting surface 10a as shown in FIG. .

13b is also possible, and any shape that allows the mounting plate 10 to be stably mounted to the cylinder 4 is effective. Moreover, the adjustment member 11a.

11b (13a, 13b) can be stacked and used.

Therefore, it goes without saying that the present invention is not limited to the above embodiments, and that various modifications can be made without departing from the spirit of the invention.

[Effects of the Invention] As described in detail above, the present invention provides a magnetic head device that has a simple configuration, simplifies manufacturing, and improves assembly workability. be able to.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the main parts of a magnetic head device according to an embodiment of the present invention, FIGS. 2 and 3 are views showing the mounting plate and adjustment member of FIG. 1 taken out, and FIG. 4 1 is a diagram showing another embodiment of this invention, and FIGS. 5 to 9 are diagrams shown for explaining a conventional magnetic head. DESCRIPTION OF SYMBOLS 1... Magnetic head, 2... Piezoelectric element, 4... Cylinder, 10... Mounting plate, 10a... Mounting surface, 10b
... recess, 10c... first mounting hole, 10d...
Second mounting holes, 11a, llb, 13a, 13b...
Adjustment member, 12...screw.

Claims (1)

[Claims] A magnetic head is mounted on one end of a piezoelectric element in which a pair of stretchable piezoelectric bodies formed with metal film electrodes are stacked with metal plate electrodes interposed therebetween, and the piezoelectric bodies are driven through a drive circuit. In the magnetic head device, the piezoelectric element is mounted on a mounting body, and the piezoelectric element is mounted on a mounting body, and the piezoelectric element is mounted on a mounting body. a mounting surface on which the piezoelectric element is placed and facing the mounting body through the piezoelectric element; and a recess provided corresponding to the mounting surface to allow expansion and contraction of the piezoelectric element and guide driving of the magnetic head. A magnetic head device comprising: a mounting plate; and an adjustment member interposed between a mounting surface of the mounting plate and the mounting body to set the mounting position of the magnetic head.