JPS63249922A - Rotary magnetic head device for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the magnetic powder of a tape shaped magnetic recording medium or other foreign matters attached on the surface of a magnetic head and to perform the normal recording and reproduction of an information signal, by connecting slidably an elastic member having flexibility with the magnetic head in rotating. CONSTITUTION:At the time of energizing an electromagnetic solenoid 11, the elastic member 12 is attracted against the force of a restoring spring 113 in a leftward direction in figure, and a sliding plate 13 also slides in a direction of arrow head 15 according to the above movement, and moves the elastic member 12 to a position to be abutted with the surface of the magnetic head 7, and abuts the elastic member 12 with the surface of the magnetic head while it is rotating. In such a way, it is possible to eliminate the magnetic powder and the other foreign matters attached on the surface of the magnetic head 7, and to record and reproduce information exactly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to magnetic recording and reproducing devices such as video tape recorders and digital audio table recorders that record and reproduce video signals, audio signals, etc. on tape-shaped magnetic recording media. This invention relates to improvements in rotating magnetic head devices.

[Conventional technology]

FIG. 2 is a vertical cross-sectional view showing a rotary magnetic head device of a conventional video tape recorder. In the figure, (1) is a chassis, and (2) is a lead groove that guides a tape-shaped magnetic recording medium (not shown). (21) is a lower drum fixed to the chassis (1), (3) is an upper drum that rotates together with the rotating shaft (4), and (5) is the lower drum that is attached to the lower drum (2). a bearing (6) that rotatably supports the rotating shaft (4);
is a motor that is a drive device that rotationally drives the rotating shaft (4),
(61) is the stator part of this motor (6), (62) is the rotor part, ('7) is the magnetic head attached to the head mounting plate (8) fixed to the upper drum (3), (9
) is a rotary transformer that transmits and receives recording and reproducing signals between the magnetic head ('7) and the signal processing device in the fixed section.

Next, the operation will be explained. When the rotary shaft (4) is rotated by the motor (6), the magnetic head ('7) moves onto the lower drum (2).
) Information is recorded on the tape-shaped magnetic recording medium running along the lead groove (21) of the tape-shaped magnetic recording medium, or information already recorded on the tape-shaped magnetic recording medium is reproduced.

[Problem that the invention seeks to solve]

The conventional rotary magnetic head device is constructed as described above, and magnetic particles and other foreign matter of the tape-shaped magnetic recording medium generated when the magnetic head ('7) comes into sliding contact with the tape-shaped magnetic recording medium are removed from the magnetic head ('7). 7), and this creates a gap between the surface of the tape-shaped magnetic recording medium and the surface of the magnetic head, resulting in the problem that information signals cannot be recorded or reproduced normally.

This invention was made in order to solve the problems of the conventional ones, and it is possible to remove magnetic particles and other foreign substances from a tape-shaped magnetic recording medium attached to the surface of a magnetic head, and to record and reproduce information signals normally. It is an object of the present invention to provide a rotating magnetic head device for a magnetic recording/reproducing device that can perform the following functions.

[Means for solving problems]

The rotating magnetic head device according to the present invention removes magnetic particles and other foreign matter adhering to the surface of the magnetic head by sliding a flexible elastic member on the surface of the rotating magnetic head. be.

[Effect]

In this invention, magnetic particles and other foreign matter adhering to the surface of the magnetic head are removed by bringing a flexible elastic member into contact with the surface of the magnetic head.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

Incidentally, in FIG. 1, the same parts as those of the conventional one shown in FIG. 2 are given the same reference numerals, and the explanation thereof will be omitted.

In the figure, (101) is a column provided on the chassis (1), and (10) is a mounting plate for an electromagnetic solenoid (11), which is fixed to the column (101). (12) is a flexible elastic member, and a typical example of this elastic member is felt, but other materials such as cloth, leather, plastic film, brush, etc. can also be used. (13)
holds the elastic member (12) facing the rotation path of the magnetic head ('f) and moves the arrow (15) by the bottle (14).
This is a slide plate supported so as to be movable toward the magnetic head ('7) and in the opposite direction, as shown in FIG. (11
1) is the plunger of the electromagnetic solenoid (11), (11)
2) 7 lunges provided on the plunger, (113)
The rear end (131) of the slide plate (13)
) is held between the return spring (113) and the 7-lunge (112).

Next, the operation will be explained. The plunger (111) is normally in the position shown in the figure, but when the electromagnetic solenoid (11) is energized, it is attracted to the left in the figure against the force of the return spring (113) and the slide plate ( 13) is also slid in the direction of arrow (15) to move the elastic member (12) to a position where it comes into contact with the surface of the magnetic head ('7).

Further movement of the slide plate (13) is prevented by the bottle (14). When the elastic member (12) is brought into contact with the surface of the magnetic head (7) while it is rotating, the magnetic head ('
There is sliding friction between the surface of 7) and the elastic member (12), and magnetic particles and other foreign matter adhering to the surface of the magnetic head ('r) are removed. At this time, since the elastic member (12) has flexibility, it will not damage the surface of the magnetic head ('7), and since it has elasticity, even if it comes into contact with the surface of the magnetic head ('7), it will not return to its original state. return to the state.

It is preferable that the elastic member (12) is provided in a range where the magnetic head (7) does not come into sliding contact with the tape-shaped magnetic recording medium, since the magnetic head (η) can be cleaned during recording and reproduction. Even if the magnetic solenoid (11) is provided in a sliding contact range, there is no particular problem since cleaning can be performed when the tape-shaped magnetic recording medium is not hung on the rotating magnetic head device.In addition, in the above embodiment, the electromagnetic solenoid (11) is Parts (12
) functions as a contact device that brings the magnetic head ('71) into contact with the surface of the magnetic head ('71), and brings the elastic member (12) into contact with the surface of the magnetic head ('7) as desired. (11) may be omitted and the elastic member (12) may be held in a position where it is always in contact with the surface of the magnetic head ('T). However, in the latter method, the electromagnetic solenoid (11) is not required. Although the former method has the advantage that the magnetic head ('r) is easily worn out, the former method has the advantage that the magnetic head ('7) is not easily worn out, but has the disadvantage that it requires an electromagnetic solenoid (11). , in reality, the cost of replacing the magnetic head (η) due to wear,
Considering the time and effort, the former method is preferable, i.e., using elastic members (
12) is in contact with the surface of the magnetic head ('71). Furthermore, in the above embodiment, the electromagnetic solenoid ('71) is in contact with the surface of the magnetic head ('71).
11) causes the elastic member (12) to come into contact with and separate from the magnetic head (force), but the electromagnetic solenoid (11)
) instead of using the elastic member (12), the elastic member (12) may be moved in conjunction with a mode selection mechanism such as playback or fast forward, or in conjunction with a loading mechanism for a tape-shaped magnetic recording medium. Furthermore, in the illustrated embodiment, the magnetic head rotates integrally with the rotating shaft (4), but
This may be a fixed shaft fixed to the lower drum (2), and the upper drum (3) may be rotated with respect to the fixed shaft by a suitable bearing. In that case, the motor (6) is usually of a built-in type.

〔Effect of the invention〕

As described above, according to the present invention, by bringing a flexible elastic member into contact with a rotating magnetic head, magnetic particles and other foreign matter adhering to the surface of the magnetic head can be removed without damaging the magnetic head. This has the effect of providing a rotating magnetic head device for a magnetic recording/reproducing apparatus that can accurately record and reproduce information.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a rotating magnetic head device according to the present invention, and FIG. 2 is a longitudinal sectional view showing a conventional rotating magnetic head device. In the figure, (4) is the rotating shaft, (6) is the drive device (motor), (7) is the magnetic head, (12) is the elastic member, (1
1) is a device (electromagnetic solenoid) that brings the elastic member (12) into contact with the magnetic head ('7). Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (2)

[Claims] (1) In a rotating magnetic head device that records and reproduces information by bringing a tape-shaped magnetic recording medium into sliding contact with a magnetic head that rotates around a predetermined axis, the magnetic head is disposed opposite to the rotation path of the magnetic head. flexible elastic member,
A rotating magnetic head device for a magnetic recording/reproducing device, characterized in that a contact device is provided for bringing the elastic member into contact with the surface of the magnetic head during rotation. (2) The magnetic recording and reproducing device according to claim 1, wherein the contact device is capable of moving the elastic member between a position where the elastic member contacts the magnetic head and a position away from the magnetic head. The device's rotating magnetic head device.