JPS59180826A - Magnetic head device - Google Patents

Abstract

PURPOSE:To prevent the shift of a recording medium and to attain the stable tracking by providing a rubbing member which rubs on the recording medium at a place near a magnetic head which is controlled for its shift by a tracking mechanism and shifting said rubbing member in the direction opposite to the shifting direction due to the tracking control. CONSTITUTION:This magnetic head device is provided with a reproduction head 11, a rubbing member 12 which is set near the head 11 and rubs a magnetic tape, and a tracking mechanism 13 which supports the head 11 and the member 12 and controls with shift the rubbing positions of these head and member to the tape. The head 11 and the member 12 are moved opposite to each other. The moving power applied to the tape from the head 11 and the member 12 in the tracking direction is opposite to each other and therefore offset between these head and member. Thus the tape is never moved to the tracking direction, and therefore the accurate tracking is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head device that can easily and stably track a recording medium.

[Technical background of the invention and its problems]

In recent years, the magnetic head in the magnetic recording/reproducing device W has been miniaturized, as typified by thin-film magnetic heads based on microfabrication technology.

Coupled with improvements in the recording characteristics of magnetic recording media and progress in microprocessor technology, digital recording devices with significantly improved quality have been developed. For example, in such a device, a digital audio system that records PCM signals by forming a multi-channel trunk in a so-called compact cenotes.
Various tape decks have been developed.

This kind of digital audio tape deck is
Generally, 18 to 36 channels are formed on a magnetic recording tape to perform parallel recording of the PCM (;
It is about 100 μm. For this reason, when tracing such minute trunks to the main disk, it is necessary to control the tracking of the magnetic field, taking into consideration the variations in the width of the tape itself and the compatibility between the old tape and the F6. becomes.

Therefore, conventionally, a magnetic herad device having a structure as shown in FIG. 1 has been considered.

This device i ¥ supports two plate springs 1.2 and a support block 3.
are arranged vertically and parallel to each other, and a head η is placed at the tip of the
A V-shaped block 4 is sandwiched therebetween.

A reproducing head 5 consisting of a thin film head is provided on the front surface of the head-mounted plotter, and a drive plate 6 is also provided on the front surface of the head-mounted plotter. 7a is connected to the upper end.

Tracking control is performed by driving the voice coil motor 7 based on a tracking error signal or the like and moving the reproducing head 5 down one step.

However, the conventional device 11 configured in this manner has the following problems. That is, so-called cassette tapes in which a magnetic recording tape is housed in a cassette case are not sufficiently prevented from moving in a direction perpendicular to the direction in which the tape moves within the cassette case (hereinafter referred to as the tracking direction). However, even if the running position of the tape is mechanically regulated with high precision, tracking control may be controlled depending on the surface condition of the case, the presence or absence of the /e pad, internal conditions such as tape tension, and external conditions such as temperature and humidity. At this time, a problem occurred in that the tape itself also moved along with the moving playback head 5. As a result, a problem arose in that stable tracking control was not performed.

[Purpose of the invention]

The present invention has been made to address these problems, and its purpose is to prevent movement of the recording medium due to magnetic and magnetic tracking control, and to achieve stable trunking. The object of the present invention is to provide a magnetic head device that makes it possible.

[Summary of the invention]

The present invention provides a sliding contact member that slides on the recording medium near the magnetic field whose movement is controlled by the tracking mechanism,
A feature of the present invention is that the sliding contact member is moved in a direction opposite to the direction of movement of the magnetic head under tracking control.

〔Effect of the invention〕

Thus, according to the present invention, the sliding member moves in the opposite direction to the magnetic head during magnetic tracking movement, so that the moving force in the tracking direction that the magnetic head applies to the recording medium is canceled out. . Therefore, even if the magnetic head is moved to perform tracking control, the recording medium does not move in the tracking direction accordingly, making stable tracking possible. In addition, since the configuration is simple, it is highly practical and provides great effects that cannot be expected from conventional devices.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a schematic diagram of a magnetic head device according to a first embodiment of the present invention. This device includes a magnetic head main body which is a reproducing head 11, a sliding member 12 that is provided near the reproducing head 11 and slidingly contacts the tape, and a sliding member 12 and the reproducing head 11. and support each other,
In addition, for these reproductions of the tape, the door 11 and the sliding member 1
2, and a tracking mechanism 13 that controls the movement of the sliding contact position with respect to each other.

The reproducing head 1 has 18 tracks of MR elements (variable magnetoresistive elements) stacked between two non-magnetic substrates, and the end faces of the stacked layers are polished in curvature. Further, the sliding contact member 12 is formed in the same shape as the reproducing head 11.

The tiger and king mechanism 13 includes a support portion 14 that supports the playback head 11 and the sliding contact member 12, respectively, and a first coil motor 15 that drives the playback head 1 in the vertical direction in the figure. A support base 17 is connected to a second disc coil motor 16 that drives the sliding member 12 in the vertical direction in the figure.
It is configured by placing it on top. Furthermore, the support section 14 is
Two leaf springs 18°19 arranged in parallel in the vertical direction,
The same two leaf springs 20.21 are arranged side by side in the left and right direction, and the rear ends of these leaf springs 18 to 21 are connected to the support block 22.2.
．． The structure is supported by 9.

In the truck blowfish mechanism 13 having such a structure, the playback head 1 is supported at the tips of the leaf springs 1B and 19 with its curvature surface facing forward, and the playback head 1 is supported at the tips of the leaf springs 20 and 21. The sliding contact part 12 is supported with its curved surface facing forward.

These reproducing head 11 and sliding contact member 12 are provided with dice coil motors 15 and 16, respectively, at the bottom thereof.
It is connected to and driven to move in parallel in the vertical direction.

The magnetic head device 6 configured as described above is used for reproduction by bringing the curved surfaces of the dot 11 and sliding contact member 12 into sliding contact with a magnetic tape (not shown).

This magnetic tape is driven to run in the left and right directions in the figure. Thus, a control signal is detected from the control signal of the reproducing head 11. The tossicking servo circuit (not shown) uses the control signal to control the first,
generating a second tracking error signal S, , S2;
These SI LS2 are sent to voice coil motors 15 and 16, respectively. As a result, the reproducing head 1 and the sliding member 12 are moved in opposite directions.

At this time, the moving forces that the magnetic tape receives from the reproducing head 1 and the sliding contact member 12 in the tracking direction are in opposite directions and are exactly canceled out, so that the magnetic tape does not move in the tracking direction. Accordingly, the reproducing head 11 is accurately positioned on the recording track by this movement, and tracking control is therefore accurately performed.

FIG. 3 is a perspective view showing a second embodiment of the present invention, and FIG. 4 is a front configuration view thereof.

In this device, a playback head 1 and a sliding member 12 are attached to opposite sides of a frame 3 having a hinge structure at the four corners. The frame body 3 is supported by a support plate 32 using a point as a fulcrum, and the frame 3 is structured to move the door 11 and the sliding contact part 12 in parallel in an up-down direction during the playback.

That is, the frame body 3 has a rectangular shape by pasting four outer panels 39, 40, 41.42 on the outer surface of the flexible film 38, and the outer panels 39, 40, 41.42 Inner plates 43 and 44 are provided inside the front vaping film 38, facing each other.
, 45.46 are attached. These inner plates 43,
Each end of 44, 45, and 46 is tapered, and the above-described hinge structure is realized by the flexible film 78 sandwiched between the outer plate and the inner plate. and,
The support body 32 is engaged with knife portions 32a and 32b at both ends of the support body 32, which are protruded from the stand 35. Note that this engaging portion is filled with a flexible adhesive 47 to connect the support body 32 and the inner plate 43.
, 45 are movably bonded to each other. As a result, the frame 31 is distorted while keeping each side parallel to each other using the knife portions 32a and 32b as fulcrums.

An actuator shaft 34 a of a voice coil motor 34 is connected to such a frame 31 through an rLJ-shaped member 33 to the outer plate 42 .

Thus, according to the device configured in this way, the frame 3
The reproducing head 11 and the sliding contact member I2 supported by the disc coil 34 are moved vertically parallel to each other and in opposite directions due to the distortion of the frame 31 caused by the drive of the disc coil 34, and the same effect as in the embodiment described above is obtained. It can be played. Furthermore, according to such a configuration, the reproducing head 1 and the sliding member 12 are supported in a suspended state on the knife edge and groove portions of the support plate 32, so that they are protected against shocks and vibrations from any direction. The playback head does not move even when the playback head is set to I-. Therefore, a magnetic head device with excellent shock resistance and vibration resistance can be provided.

FIG. 5 shows a third embodiment of the present invention.

In this device, a reproducing plate 11 and a sliding contact member 12 are respectively attached to opposite positions of a four-shaped steel bell 53. steel belt 5
3 is a support frame 55 with both ends shaped like a "U" character.
The motor 5 is suspended between rollers 56 and 57 provided at each end of the motor 5, which rotates the roller 57.
It is designed to rotate 8 degrees.

Therefore, the sliding contact member 12 of the rJ raw head 1 is as follows:
Since it is provided between the IYs gripping rollers 55 and 56 of the steel belt 53 supported as described above, it is moved in the opposite direction up and down by the rotation of the belt 53.
Therefore, the same effect as the previous 4u example can be achieved. Furthermore, if the reproducing head 11 and the sliding contact member I2 are made to have the same weight, it is possible to provide a magnetic head device with good impact resistance and vibration resistance, as in the previous embodiment. In addition, tIJ: The rotational movement range of the belt 53 is set to: 1ill so that the raw head 1 and the sliding contact member 12 are restricted only between the rollers 55° and 56.
There is no limit to 5.

As described above with reference to the first to third embodiments, in the present invention, the displacement force applied to the magnetic recording tape is applied to the town cow by moving the donono and the sliding contact member 12 in opposite directions. Since the movement offset in the direction of the tiger and king is prevented, accurate tiger and king control by magnetic field is possible. Furthermore, since the device configuration is simple, effects such as high practicality can be achieved.

It is also possible to replace the sliding contact member 12 in the above embodiment with a recording head to provide a magnetic device with even higher added value.

[Brief explanation of the drawings] Figure 1 shows the conventionally proposed digital audio system.
External perspective view showing Chizibucki's magnetic head device, 2nd
The figure is an external perspective view of a magnetic head device according to a first embodiment of the present invention, and FIG. 3 is a perspective view of a magnetic head device according to a second embodiment of the present invention. 1.2.18~2... leaf spring, 3,22.23...
・Support pro, ri, 4...head mounting block, 5.1
1. Reproducing head, 6... Drive plate, 7.15, 16.3
4...Voice coil motor, 12...Sliding contact member, 1
3゜36.54...Tracking mechanism, 14...Support part, 17.35...Support stand, 3...Frame body, 32
...Support body, 33... Part side, 38... Flexible film, 39-42... Outer plate, 43-46... Inner plate,
47... Flexible adhesive, 53... Steel belt,
55... Support frame, 56° 57... Loaf, 58...
·motor. Applicant's representative Patent attorney Takehiko Suzue No. 15! J Figure 3 Figure 4 2b

Claims (2)

[Claims] (1) A magnetic head main body provided in sliding contact with a magnetic recording medium that is driven to run in one direction, and the magnetic head main body is moved in a direction perpendicular to the running direction of the magnetic recording medium within the plane of the magnetic recording medium. a tracking mechanism that performs tracking and king control; and a tracking mechanism that is provided in the vicinity of the magnetic head body and in sliding contact with the magnetic recording medium to control movement in a direction opposite to the direction of movement of the magnetic head body by the tracking mechanism. A magnetic head device comprising a sliding contact member. (2) Claim (1) characterized in that the sliding contact member is a magnetic head different from the magnetic head main body.
The magnetic head device described in .