JPS59168924A - Magnetic head moving device - Google Patents

Abstract

PURPOSE:To move a head so that its contact surface to a tape is not inclined, by fixing one end of one set of parallel plate springs to a head fitting base, fixing a head fixing plate to the other end, and fitting so that the head is placed between the parallel plate springs. CONSTITUTION:A head 6 having a sound recording gap 4 and a reproducing gap 5 is fixed to a head fixing plate 7, the head fixing plate 7 is fixed to one end of one set of parallel plate springs 8, the other end of the parallel plate spring 8 is fixed to a parallel plate spring fixing plate 9, and the parallel plate spring fixing plate 9 is fixed to a head fitting base 10. A voice coil 12 is fixed to a coil fixing plate 11 projected from the head fixing plate 7, and a voice coil motor use magnet 13 is fixed to the head fitting base 10. One set of parallel plate springs 8 are bent by applying a force of a Z direction to the head fixing plate 7, by the voice coil motor 12, and the head 6 moves in the Z direction together with the head fixing plate 7. Since the movement in the Y direction is minute, no influence is exerted on reproducing. A direction of a force which the head receives by a tape tension and a pad pressure is an X direction, therefore, no influence is exerted on a Z direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a tape recorder that performs magnetic recording and reproduction, and particularly to a magnetic head moving device.

[Prior art and its problems]

Compact cassette P-C-M, which has been urgently developed in recent years
In tape recorders, in order to increase areal recording density,
18 to 36 tracks are provided for recording and reproduction.

3. If 18 to 36 tracks are provided on a tape width of 81111, the track width will be 100 μm to 50 μm, so
Track deviation must be suppressed within 1.0 μm to 5 μm. However, the current standard value for the tape width of compact cassettes is 3.81-0.0511, which is 5.
Variations in tape width of as much as 0 nm are allowed. Therefore, it is not possible to suppress the track deviation within 10 μm to 5 μm only by regulating the tape running position using a tape guide as in the conventional method. Therefore, a head moving device that allows the head to follow the track during production is in high demand.

As a conventional head moving device, there is a method shown in FIG. 1 (see Institute of Electronics and Communication Engineers technical research report (EA81-64)). As shown in the figure, a recording/reproducing combination head 1 is supported by a parallel leaf spring 2. By applying force to the force point 3 in some way, the head 1 can be moved in the vertical direction in the figure. With this configuration, the head and the parallel plate springs are arranged in series, resulting in a large device as a whole. Also, if the force applied by the tape is in the right direction in the figure, that force will affect the displacement in the vertical direction in the figure, and even if the force is constant, the force applied in the vertical direction at point 3 and the displacement will be as shown in Figure 2. As shown, it became non-linear and was extremely undesirable as a head moving device for tracking servo. Furthermore, once the rigidity of the head in the moving direction is determined, the rigidity of the head in the direction perpendicular to the tape contact surface is also determined υ, which limits the degree of freedom in design and makes it difficult to design.

[Purpose of the invention]

This invention improves the drawbacks of the conventional device mentioned above.
It is an object of the present invention to provide a compact magnetic head moving device that has no hysteresis in the relationship between force and displacement.

[Summary of the invention]

According to this invention, one end of a set of parallel plate springs is fixed to the head mounting base, a head fixing plate is fixed to the other end of the parallel plate spring, and the head is fixed to the head fixing plate between the parallel plate springs. By mounting the head in such a way that it can be sandwiched, it is possible to move the head without tilting the surface of the head that comes into contact with the tape.

〔Effect of the invention〕

As mentioned above, since the head is attached between the leaf springs, the overall size can be reduced to about half of the conventional size. Since the direction of the force that the head receives from the tape and pad is perpendicular to the plane of movement of the head, the movement of the head is no longer affected by the force that the head receives from the tape or pad.

Since the rigidity in the moving direction of the head and the rigidity in the direction of the force applied to the tape and pad can be arbitrarily selected by combining the width and thickness of the leaf spring, the degree of freedom in design is large and easy to design.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a perspective view of one embodiment of the present invention, and FIG. 4 is a front view thereof. In each figure, the same parts are given the same reference numerals.

In FIGS. 3 and 4, a head 6 having a recording gap 4 and a reproduction gap 5 is fixed to a head fixing plate 7, and the head fixing plate 7 is fixed to one end of a set of parallel leaf springs 8.
The other end of the parallel plate spring 8 is fixed to a parallel plate spring fixing plate 9,
A parallel plate spring fixing plate 9 is fixed to a head mounting base 10. The voice coil 12 is fixed to the coil fixing plate 11 protruding from the head fixing plate 7, and the voice coil motor magnet 13 is fixed to the head mounting base 10. Form.

Since the configuration is as described above, Pois coil motor 1
2, when force is applied to the head fixing plate 7 in two directions in the figure, the - pair of parallel plate springs 8 are deflected, and the head 6 fixed thereto moves together with the head fixing plate 7 in the two directions in the figure.

Although it moves in the Y direction, it is so small that it does not affect playback in any way. Since the direction of the force applied to the head due to tape tension and pad pressure is the X direction in the figure, the force does not have any influence in the two directions.

[Other embodiments of the invention]

FIG. 5 is a front view showing another embodiment of the present invention. The same parts as in the previous embodiment are given the same reference numerals.

A set of parallel plate springs 8 and parallel plate spring fixing plate 9 of the above embodiment
These three parts are replaced with one U-shaped leaf spring 14. Such a configuration particularly reduces the number of parts and improves productivity.

FIG. 6 is a front view showing another embodiment of the present invention. The same parts as in the previous embodiment are given the same reference numerals.

The arrangement of the voice coil magnet 13 and the voice coil 12 in the above embodiment is reversed, and the voice coil magnet 13 is fixed on the movable side. Since the voice coil 12 is fixed on the non-movable side, processing of the wire is easy and productivity is improved.

FIG. 7 is a front view showing another embodiment of the present invention. The same parts as in the previous embodiment are given the same reference numerals.

In place of the recording and reproducing head 6 in the above embodiment, a reproducing head 15 is fixed to the head fixing plate 7, and the recording head 1 is fixed to the head fixing plate 7.
6 is fixed to a parallel plate spring fixing plate 9.

Since the recording head is fixed to the parallel plate spring fixing plate 9 on the non-movable side, the position of the recording gap 4 is constant, and track waving due to head wobbling during recording is eliminated.

[Brief explanation of drawings]

Fig. 1 is a side view of a conventional example, Fig. 2 is a diagram showing the relationship between displacement and force in the conventional example, Fig. 3 is a perspective view showing an embodiment of the present invention, and Fig. 4 is a front view thereof. 5 is a front view showing another embodiment of the invention, FIG. 6 is a front view showing another embodiment of the invention, and FIG. 7 is a front view showing another embodiment of the invention. 1.6...recording/playback combination head, 2.8
...Parallel plate spring, 3...Point of force, 4...Recording gap, 7...Head fixing plate, 9...Parallel plate spring fixing plate, 10...Head fixing base, 11... coil fixing plate,
12... Voice coil, 13... Voice coil magnet, 14... U-shaped leaf spring, 15... Playback head, 16... Recording head. Agent: Patent attorney Kensuke Chika (and 1 other person)

Claims (1)

[Claims] It consists of a head mounting base, a set of parallel plate springs fixed to it at one end, a head fixing plate fixed to the other end of the parallel plate spring, and a head fixed to a head identification plate. A magnetic head moving device characterized in that the magnetic head moving device is mounted so that the contact surface of the tip of the head and the longitudinal direction of the leaf spring are parallel to each other so as to be sandwiched therebetween.