JPS5947372B2 - magnetic head device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head device for a magnetic sheet recorder.

Conventional magnetic head devices include a magnetic head whose contact surface has been modified in various ways (for example, by rounding) in order to make smooth contact with the magnetic sheet material, and a magnetic head that has a contact surface with the magnetic sheet material. In order to keep the strength constant, the magnetic head is constructed of a rigid supporting means which is movable in the vertical and horizontal directions and is attached directly or indirectly through an elastic body such as a spring material. However, in the conventional device as described above, (1) large amplitude vibrations called dust attached to the surface of the magnetic sheet material or flapping or fluttering of the magnetic sheet material are directly connected to the magnetic head and the magnetic sheet material. Since the degree of contact is varied, the signal output of the magnetic head is likely to vary.

(2) The magnetic head contact surface and the magnetic surface of the magnetic sheet material are roughened by the dust such as fine powder of the magnetic layer that is transferred and accumulated on the contact surface of the magnetic head, and as a result, the wear of both is accelerated and the lifespan is shortened. significantly reduced. There are drawbacks such as. SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head mounting which eliminates the drawbacks of the conventional mounting as described above and provides stable signal output.

Another object of the present invention is to provide a dummy head ( yHead for Du type) and a support in which the magnetic head and the dummy head are aligned so that the dummy head contacts the track on the magnetic surface of the magnetic sheet material that contacts the magnetic head at a position further forward than the magnetic head. This is achieved by a magnetic head device characterized by comprising means.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the apparatus of the present invention will be described in detail based on the attached drawings.

In FIG. 1 showing one embodiment of the device of the present invention, reference numeral 1 denotes a magnetic head fixed to the lower surface of a support means 3 that is movable vertically and horizontally.

la is the contact surface of the L magnetic head 1; 2 is placed on the lower surface of the support means with a certain gap between the magnetic head 1 and the magnetic head 1, and the magnetic head 2 contacts the magnetic head 1, and attaches the magnetic head to the track on the magnetic surface of the magnetic sheet material 4 passing through. This is a dummy 1-head arranged so as to be in contact with the dummy 1 in front of the dummy 1.

The dummy head 2 has the same overall height H as the magnetic head 1.
and, as shown in FIG. 2, a width d equal to or greater than the width dl of the magnetic head 1.

, and are aligned on the same center line A as the magnetic head 1. Incidentally, the gap B between the magnetic head 1 and the dummy head 2 is preferably set within the range of 5 to 20 mm.

Further, the contact surface 2a of the dummy head 2 may be made of the same material as the magnetic head 1, depending on the material, hardness, or finish of the magnetic surface of the magnetic sheet material 4 to be contacted. Or lubricate soft materials such as felt or copper, or porous materials such as copper, resin, or fiber with silicone oil.2. When containing the agent, the side cross-sectional shape becomes rectangular as shown in Figure 3a, or as shown in Figure 3b.
A rectangle with rounded front and rear corners, or a third
As shown in Figure c, the whole is formed into an arc shape.

Further, even if the dummy head 2 is constructed by fixing a contact member 2c having the above-mentioned material, hardness and shape to the lower surface of the three base members 2c, as shown in FIG. 3d, It does not interfere with its action or effect in any way. The operation of the magnetic head device 3 of the present invention constructed as described above will now be described.

When the tip of the supporting means 3 approaches the magnetic surface of the magnetic sheet material 4 which is rotating at high speed while floating horizontally on a substrate (not shown) of a magnetic sheet recorder, the magnetic sheet material 4 The tracks 4 on the magnetic surface of the magnetic head 4 first come into contact with the dummy head 2 disposed in front of the magnetic head 1, and the dust adhering to the surface of the tracks is transferred to the dummy head 2. is removed over the entire width d2 of the dummy head 2 and the gap B.
After being attenuated and absorbed by the magnetic head 1, the magnetic head 1 contacts and passes through the magnetic head 1, during which recording or reproduction of signals by the track and the magnetic head 1 is performed.

The device of the present invention described above has the following features: (1) Since the dummy head 2 is disposed in front of the magnetic head 1 with a certain gap B between the magnetic head 1 and the magnetic head 1, the main flapping components on the surface of the track are The remaining flapping component can be absorbed by the dummy head 2 and attenuated by the gap B. As a result, it has become possible to significantly reduce fluctuations in the degree of contact between the magnetic head 1 and the track.

(2) Depending on the material, hardness, or finish of the magnetic surface, the material should be the same as the magnetic head 1 or hard such as felt or copper, and the width d should be equal to or larger than the width d of the magnetic head 1. Width d or more. Since the dummy head 2 having a magnetic head 1 is arranged in line with the magnetic head 1 with a gap B, the dummy head 2 can clean the dust attached to the surface of the track over the entire width d2 without damaging the surface of the track. and the magnetic head 1 of the dust.
As a result, the magnetic head 1
It has become possible to significantly reduce fluctuations in the degree of contact between the magnetic head 1 and the track, as well as damage and wear on the surfaces of the magnetic head 1 and the track, and to extend the life of the magnetic head 1 and the track. . (3) Since the contact surface 2a of the dummy head 2 is impregnated with a lubricant such as silicone oil, the contact with the surface of the track becomes smoother, resulting in damage to the dummy head 2, the track, and even the magnetic head 1. It has also become possible to further suppress wear and tear, and thus to further extend the lifespan of the three components.

(4) Due to the effects of (1) to (3) above, the magnetic head 1
Since fluctuations in the degree of contact between the track and the track are significantly reduced,
The signal output of the magnetic head 1, especially the high frequency output, is stabilized,
Furthermore, it has become possible to obtain high-quality output with less dropout.

It has the following effects.

Next, examples and comparative examples of the device of the present invention will be described.

Example I (Type A) Magnetic coating liquid A and magnetic coating liquid B were each coated to a thickness of 10μ on a polyethylene tephthalate support with a thickness of 22μ, and dried to form a magnetic surface.
I. A sample of the condition combination table* sheet was created.

Comparative example I (A type) Next, track width 125μ, length 3mm) Gap width 0
．． A magnetic recorder equipped with a magnetic head device consisting of a rectangular magnetic head made of 7μ ferrite with rounded front and rear corners, and various combinations of dummy heads of various materials and shapes. A sample of the magnetic sheet of Example I (type A) was attached to the tube, and a 4 MHz signal was recorded while applying rotations of 3,600 revolutions per minute, and played back to determine the stability of the output, Evaluations were made regarding scratches on the magnetic sheet, number of dropouts, surface roughness of the magnetic head, life of the magnetic sheet, etc.

Table I below is a condition combination table, and Table -■ summarizes the comparison results.

In the table - ■, × indicates not acceptable, △ indicates good, ◯ indicates good, and ◎ indicates excellent. The life of a magnetic sheet is the cumulative usage time until the magnetic sheet breaks.

From Tables I and 2 above, it was confirmed that the difference between the presence and absence of dummy heads was extremely significant across all evaluation items.

[Brief explanation of the drawing]

1 is a side view of one embodiment of the apparatus of the present invention, FIG. 2 is a plan view of FIG. 1, and FIGS. 3a to 3d are cutaway side views of a modification of the dummy head. 1 is a magnetic head, 2 is a dummy head, 3 is a support means, 4
is the magnetic shield material, A is the center line of the magnetic head 1 and the dummy head 2, B is the gap between the magnetic head 1 and the dummy head 2, d is the width of the magnetic head, d.

Claims (1)

[Claims] 1. In a magnetic head device for a magnetic sheet recorder,
a, the magnetic head 1; and b, a contact surface 2a having a width d_2 equal to or greater than the width d_1 of the magnetic head 1, and a hardness equal to or less than the hardness of the contact surface 1a of the magnetic head 1. c, such that the dummy head 2 precedes the magnetic head 1 with a gap B of 5 to 20 mm on a track on the magnetic surface of the magnetic sheet material 4 in contact with the magnetic head 1; A magnetic head device characterized in that the magnetic head 1 and the dummy head 2 are each provided with a supporting means 3. 2. The magnetic head device according to claim 1, wherein the dummy head 2 is impregnated with a lubricant.