JP3475380B2 - Magnetic media pressure welding device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention presses a magnetic head for recording or reproducing information on a magnetic layer of a substantially transparent photographic film with a magnetic layer (hereinafter referred to as a film) which is a magnetic medium. The present invention relates to a magnetic medium pressure welding device, and more particularly, to a magnetic medium pressure welding device in which a magnetic layer is brought into close contact with a gap of a magnetic head to run a film, so that the magnetic medium is pressure-contacted from the back surface of the magnetic layer.

[0002]

2. Description of the Related Art As a means for easily exchanging information in a photographic system, a system in which a substantially transparent magnetic recording layer is provided on the entire back surface of the film and necessary information is directly recorded on the magnetic layer of the film is an international application. WO-90 / 042
No. 05, WO-90 / 04214, US Pat. No. 4,965,627, USP-497573.
It is proposed in Japanese Patent Publication No. 2 and the like.

In magnetic recording / reproducing, the gap (spacing) between the magnetic head and the magnetic layer has a significant effect on the performance, and ordinary film magnetic recording is compared with conventional magnetic tapes and disk devices for computers. It is assumed that the recording density is much lower, and the read signal amplitude becomes half or less when a gap of 1 μm is opened, and the signal output is originally small in a substantially transparent magnetic layer with a thin packing density of the magnetic recording material, which is fatal. In some cases,

Therefore, in magnetic recording / reproduction on a film having a transparent magnetic layer, a magnetic head supporting device for ensuring close contact between the magnetic layer on the film and the magnetic head is extremely important.

A magnetic head supporting device for a film is disclosed in US Pat. No. 5,038,836.
No. 5,041,933 and US Pat. No. 5,285,325 are known. In these, regarding the contact method between the gap of the magnetic head and the magnetic recording surface of the film,
In the former two US patents, the magnetic head is attached to a guide rod perpendicular to the film surface, the magnetic head is pressed against the film surface by a coil spring, and the film is attached to a curved film guide with tension. ing. Further, in USP-5285325, etc., the head gap and the magnetic layer of the film are closely contacted to each other by pushing from the back surface of the film with the magnetic layer in contact with the head gap with a pad made of felt or a rubber roller.

Further, in Japanese Patent Laid-Open No. 5-347065 and Japanese Patent Application No. 7-203262, an elastically deformable lead-like pressure contact member is provided in a cavity provided in a rigid frame.
There is described a configuration in which the film is held in a state of being bent in an arc shape, and the film is pushed by the spring property of the arc part so that the gap portion of the magnetic head and the magnetic layer of the film travel closely.

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The structures described in Japanese Patent No. 7065 and Japanese Patent Application No. 7-203262 are considered to be one of the preferable means for running the film after the magnetic layer of the film and the magnetic head are stably brought into close contact with each other.

With respect to the above-mentioned lead-like pressure contact member, in order to prevent the fatigue from occurring over a long time by pressing the lead-like pressure contact member into the gap of the magnetic head with a suitable pressure, the bending elastic limit is large, and the lead-like pressure contact member is used for a long time or a large number of times. It is necessary to have excellent spring properties so that plastic deformation does not easily occur even under pressure bending. As a material satisfying such requirements and being available, a stainless thin plate material for spring, for example, SUS304 is suitable.

However, since the thin leaf spring material is rolled and formed to have an appropriate thickness, when the thin leaf spring material has magnetism, it is easily magnetized in the rolling direction. Therefore, when a rolled thin plate material is punched out in any direction to form a lead-shaped pressure contact member, if the rolling direction and the film running direction are approximately the same, the magnetic signal recording / reproduction due to noise generated from the lead-shaped pressure contact member. Sometimes it causes an error.

In view of the above problems, it is an object of the present invention to propose a magnetic medium pressure contact device which does not generate harmful noise that causes an error when recording / reproducing a magnetic signal.

[0011]

SUMMARY OF THE INVENTION In order to solve the above problems, a thin leaf spring material that is rolled is used as a material so as to be elastically deformable, and a flexible magnetic medium can be urged to be pressed against a magnetic head. In the magnetic medium pressure welding device including the reed-shaped pressure welding member, the reed-shaped pressure welding member is formed by matching the running direction of the magnetic medium with a direction substantially orthogonal to the rolling direction of the thin leaf spring material. magnetic medium pressure welding apparatus to be solved from the two.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to FIGS.

First, the magnetic medium pressure contact device described in the above-mentioned Japanese Patent Laid-Open No. 7-203262 will be described with reference to FIGS.
Will be explained.

In FIGS. 1 and 2, a film 5 having a substantially transparent magnetic layer, which is a flexible magnetic medium, provided on the surface opposite to the photosensitive emulsion surface is biased from the emulsion surface side, and a magnetic head 7 is provided. There is shown a magnetic medium press-contacting device including an elastically deformable lead-like press-contacting member 3 adapted to be brought into contact with the magnetic medium.

The lead-like pressure contact member 3 is formed by punching a thin leaf spring material and then curving it in an arc shape.
It is held in the cavity 11 formed by the pair of opposing walls 13 and 15. Lead pressure contact member 3
Deforms as shown in FIG. 2 and presses the film 5 against the magnetic gap portion of the magnetic head 7. This pressure contact force is determined by the spring constant of the lead-like pressure contact member 3 and its deformation amount. Therefore, the thin leaf spring material and its thickness are selected according to the required pressure contact force, and the relative position between the magnetic head 7 and the rigid frame 9 is determined and fixed.

FIG. 3 is a view of a thin leaf spring material 30 which is a material of the lead-shaped pressure contact member 3. Although the thin leaf spring material 30 is rolled in the direction of the arrow in the figure, when the thin leaf spring material 30 has magnetism, it is easily magnetized in the rolling direction. Therefore, the blank for forming the lead-like pressure contact member 3 is replaced by the blank 3
If the punching is performed as shown in FIG. 1, the rolling direction and the film running direction coincide with each other, and noise generated from the lead-like pressure contact member 3 may cause an error in recording / reproducing a magnetic signal. Therefore, when the blank forming the lead-shaped pressure contact member 3 is punched out like the blank 32, the rolling direction and the film running direction are orthogonal to each other. That is, the magnetization direction of the lead-shaped pressure contact member 3 and the gap of the magnetic head 7 become parallel, and the influence of noise generated from the lead-shaped pressure contact member 3 is reduced. In particular, in a magnetic medium such as a film with a transparent magnetic layer, since the magnetic energy of the signal recorded in the transparent magnetic layer is extremely small, such noise cannot be ignored, and as described above, rolling Regulating the direction is effective.

The lead-shaped pressure contact member 3 is formed so that the rolling direction of the thin leaf spring material 30 which is the material of the lead-shaped pressure contact member 3 and the film running direction are always exactly 90 degrees orthogonal to each other.
Even if it is not formed, if it is formed so as to be substantially orthogonal, a sufficient effect can be obtained.

In the above embodiment, the film 5 is directly urged by the lead-shaped pressure contact member 3, but a pad made of felt, sponge or the like is attached to the lead-shaped pressure contact member 3, and the film 5 is attached via the pad. You may encourage.

FIG. 4 is a perspective view of the magnetic medium pressure welding device. Regulation plates 10 that are regulation members that regulate the side portions of the lead-shaped pressure contact member 3 are provided on both sides of the rigid frame 9.

The rigid frame 9, which is a holding member for holding the lead-shaped pressure contact member 3, and the restriction plate 10 are non-magnetic members,
Alternatively, when it is formed of a demagnetized magnetic member, magnetic noise can be prevented, and the lead-like pressure contact member 3 can be prevented from being magnetized.

FIG. 5 is a side view of a magnetic medium pressure contact device which does not use the lead-shaped pressure contact member 3. A metal inner cylinder 42 is provided inside the rubber roller 41, which is a rotating member, and a bearing 43 and a shaft 44 are provided inside the inner cylinder 42. A metal support member 45 supports both ends of the shaft 44, and a lower portion of the support member 45 is biased by a compression spring 46. With this structure, the rubber roller 41 is pressed against the film 5 and the magnetic head 7 is pressed against the magnetic head 7 by the urging force of the compression spring 46. Since it rotates with 42, the film 5 is less likely to be scratched.

Here, the inner cylinder 42, the bearing 43, the shaft 4
4 and the supporting member 45 are made of iron, magnetic noise can be prevented by forming a non-magnetic member or a demagnetized magnetic member as a material.

[0023]

According to the magnetic medium pressure welding device of the first aspect,
The magnetization direction of the lead-shaped pressure contact member and the gap of the magnetic head are parallel to each other, so that noise that is harmful to recording and reproduction of the magnetic signal generated from the lead-shaped pressure contact member can be avoided, and as a result, a stable magnetic head and film can be formed. It is possible to realize an excellent magnetic medium pressure contact device capable of closely running and less likely to cause an error.

According to the magnetic medium pressure contact device of the second and third aspects, it is possible to prevent magnetic noise and also prevent magnetization of the lead-like pressure contact member.

[0025]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a magnetic medium pressure contact device showing a state in which a lead pressure contact member is in a relaxed normal position.

FIG. 2 is a cross-sectional view of the magnetic medium pressure contact device showing a state in which the film with a magnetic layer is urged by the deformation of the lead-shaped pressure contact member to be pressed against the magnetic gap of the magnetic head.

FIG. 3 is a view of a thin leaf spring material which is a material of a lead-like pressure contact member.

FIG. 4 is a perspective view of a magnetic medium pressure welding device.

FIG. 5 is a side view of a magnetic medium pressure contact device that does not use a lead-shaped pressure contact member.

[Explanation of symbols]

3 Lead-shaped pressure welding member 5 films 7 Magnetic head 9 rigid frame 10 regulation plate 11 cavities 30 Thin leaf spring material 31, 32 blank 41 rubber roller 45 Support member

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-7-244707 (JP, A) JP-A-7-64168 (JP, A) JP-A-5-281605 (JP, A) JP-A-9- 106610 (JP, A) JP-A-2-214058 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G03B 17/24 G11B 15/60

Claims (3)

(57) [Claims] 1. A lead-like pressure contact member formed by elastically deforming a rolled thin leaf spring material so that a flexible magnetic medium can be biased into pressure contact with a magnetic head. In the magnetic medium pressure welding apparatus, the lead-shaped pressure welding member is formed by aligning a running direction of the magnetic medium with a direction substantially orthogonal to a rolling direction of the thin leaf spring material. 2. The magnetic medium pressure contact device according to claim 1, wherein the holding member for holding the lead-shaped pressure contact member is formed of a non-magnetic member or a demagnetized magnetic member. 3. The magnetic medium pressure contact according to claim 1, wherein the restricting member for restricting a side portion of the lead-like pressure contact member is formed of a non-magnetic member or a demagnetized magnetic member. apparatus.