JPS62121961A - Rotating magnetic sheet device - Google Patents

Abstract

PURPOSE:To obtain an appropriate head touch without fail even if a magnetic head is worn by fitting a regulating plate regulating a sheet position on a regulating plate supporting body through an elastic body. CONSTITUTION:The magnetic head 17 and the regulating plate 15 are opposite each other and arranged over a magnetic sheet 13, and its position is regulated. The regulating plate 15 is fitted on the regulating plate supporting body 21 through the elastic member 33. Accordingly, if the tip of the magnetic head 17 is displaced due to a wear, etc., the elastic member 33 extends by an amount as is found necessary, and the regulating plate 15 is displaced to the side of the magnetic head. As a result, the relative distance between the head 17 and the regulating plate 15 can be kept constant. Thus even if the head 17 is worn, the appropriate head touch can be obtained without fail.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a rotating magnetic sheet device, and particularly to a support structure for a regulating plate thereof.

<Prior Art> An electronic still camera system that combines an imaging device using a solid-state image sensor or an image pickup tube, and a rotating magnetic sheet device as a recording and reproducing device using a magnetic sheet as a recording medium electronically captures the subject. This is a system in which still images are taken and recorded on a rotating magnetic sheet, and the image information recorded on the magnetic sheet can be reproduced on a television, printer, etc. The magnetic sheet used in the rotating magnetic sheet device of such an electronic still camera system is rotatably housed in a casing and is generally used in the form of a magnetic sheet pack called a video floppy.

The rotating magnetic sheet device includes a mechanism for rotating the magnetic sheet in this magnetic sheet pack and a magnetic head, and
While the magnetic sheet is rotated at high speed, a magnetic head performs recording and reproduction on the magnetic sheet.

By the way, in order to ensure reliable recording and reproduction on the magnetic sheet in a rotating magnetic sheet device, the magnetic head must be brought into stable contact with the magnetic sheet rotating at high speed. Since the magnetic head has flexibility, a good head touch cannot be obtained simply by bringing the magnetic head into contact with the magnetic sheet surface. Therefore, a technique has been developed in which a regulating plate is provided at a position facing the magnetic head while sandwiching the magnetic sheet, and the magnetic head is brought into stable contact with the magnetic sheet by air flow between the regulating plate and the magnetic sheet.

Figure 4 is a perspective view of an example of this rotating magnetic sheet device, and Figure 5 is a perspective view of an example of this rotating magnetic sheet device.
The figure is a sectional view of the main part. As shown in FIG. 5, the magnetic sheet pack 11 has a magnetic sheet 13 inside the casing 12.
The magnetic sheet 13 is rotatably supported.
A center core 14 is attached to the center of the. The casing 12 has a hole 12a for exposing the center core 14 and a window 12b for bringing the regulating plate 15 into contact with the magnetic sheet 13 on its upper surface, and a hole 12C1 for passing the spindle 16 through the magnetic sheet 13 on its lower surface. A window 12d for bringing the head 17 into contact with the magnetic sheet 13 and a pack positioning hole 12e are opened. A soft magnetic buried plate 18 is fixed to the lower surface of the center core 14.
The center core 14 is detachably fixed to the spindle 16 by attracting the buried plate 18 with an annular magnet 19 provided on the spindle 16. In addition, a PG yoke 20 integrated with the buried plate 18 is exposed on the upper surface of the center core 14, and when the buried plate 1B is attracted to the magnet 19, leakage magnetic flux is generated therefrom, which is transferred to the regulating plate support plate 2.
Feedback control of the rotation of the magnetic sheet 13 is performed by detecting it with the PG coil 22 fixed to the magnetic sheet 13.

On the other hand, as shown in FIGS. 4 and 5, a spindle motor 24 equipped with the spindle 16 for rotationally driving the magnetic sheet 13 is disposed approximately at the center of the rotating magnetic sheet device main body 23, and A carriage 25 on which the magnetic head 17 is mounted adjacent to the spindle motor 24 is slidably supported in the radial direction of the magnetic sheet 13 mounted on the spindle motor 24. A feed screw 27 that is rotationally driven by a head feeding stepping motor 26 is screwed into the carriage 25, and the operation of the stepping motor 26 positions the magnetic sheet 13 of the magnetic head 17 in the radial direction. Further, the regulating plate 15 is attached to the lid 29, which is attached to the main body 23 of the apparatus by a hinge 28 so as to be openable and closable. That is, the regulation plate 15 is fixed to the regulation plate support plate 21, and the regulation plate support plate 21 is attached to the lid body 29 by the leaf spring 30. Part B regulation plate support plate 21
A plurality of positioning holes 21a are bored in the device body 23, and a positioning pin 31 that fits into the positioning holes 21a is protruded from the main body 23, as shown in FIG.
When 9 are closed, they fit together, so that the regulating plate support plate 21 is positioned opposite the magnetic head 17.
This allows the regulation plate 15 to be positioned at the required position. Further, the magnetic sheet pack 11 is also positioned by fitting a positioning pin 32 protruding from the device main body 23 into a pack positioning hole 12e opened in the casing 12. 15 will be facing each other.

<Problems to be Solved by the Invention> Since the magnetic head 17 is in sliding contact with the magnetic sheet 13 that rotates at high speed, the leading end of the magnetic head 17 wears out over time. However, conventionally, the regulating plates 1 and 5 are fixed to the regulating plate support plate 21, which is positioned with respect to the main body 23 of the apparatus, by means such as screws, so that due to wear of the magnetic head 17, the tip of the regulating plate 15 may be damaged. The distance becomes wider. That is, as shown in FIG. 6, when the magnetic head 17 is not yet worn out, the tip of the magnetic head 17 digs into the recess of the regulation plate 15 by a required amount, and the magnetic sheet 13 held between them However, if the magnetic head 17 wears out by the amount of wear ΔH, the relative distance between the magnetic head 17 and the regulation plate 15 increases by that amount, making it impossible to obtain a proper head touch. There was a problem.

Means for Solving the Problems> The present invention solves the problems described above, and provides a rotation system that can always obtain a proper head touch even when the tip position of the magnetic head is displaced due to wear or the like. The present invention aims to provide a magnetic sheet device.

In order to achieve this object, the rotating magnetic sheet device according to the present invention has a structure that uses a regulation to sandwich the magnetic sheet being driven and rotated and to regulate the position of the magnetic sheet where the magnetic head slides into a position facing the magnetic head. A rotating magnetic sheet device in which a plate is arranged, characterized in that the regulating plate is attached via an elastic member to a regulating plate support that is positioned at a predetermined position facing the magnetic head. .

Function> Due to the deformation of the elastic member, the regulating plate is biased toward the magnetic head and is positioned opposite the magnetic head, sandwiching the magnetic sheet, and regulates the position of the magnetic sheet in contact with the magnetic head. When the tip of the magnetic head is displaced due to wear or the like, the elastic member stretches to that extent and the regulating plate is displaced toward the magnetic head, thereby keeping the relative distance between the magnetic head and the regulating plate substantially constant.

Embodiments Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a sectional view of a main part of a rotating magnetic sheet device according to an embodiment of the present invention. In FIG. 1, the same parts as those of the conventional one are given the same reference numerals, and redundant explanations will be omitted.

As shown in FIG. 1, a regulating plate 15 is attached to a regulating plate support plate 21, which is a regulating plate support body, which faces the magnetic head 17 and is positioned on the device main body 23 by a positioning pin 31 when the lid body 29 is closed. Elastic member 33 made of rubber
Mounted via. When the magnetic sheet pack 11 and the regulating plate support plate 21 are positioned at a predetermined position, the regulating plate 15 is pressed against the magnetic head 17 via the magnetic sheet 13, and the elastic member 33 is compressed and deformed. It is designed to be positioned at a desired position.

Therefore, when the regulation plate 15 is in use, it is always urged toward the magnetic head 17 by the elastic member 33. Therefore, when the magnetic head 17 wears out and its tip position shifts, the elastic member 33 stretches to adjust the regulation. The plate 15 is displaced toward the magnetic head 17, thereby causing the magnetic head 17 and the regulation plate 15 to
The relative distance can be kept approximately constant. That is,
As shown in FIG. 2, for example, when the magnetic head 17 wears out by an amount of wear ΔH, the pressing force of the magnetic head 17 decreases, and the elastic member 33 stretches by an amount of extension Δ2, causing the m-sizing plate 15 to become magnetic. Displace it to the Rad 1F side. This ΔH and ΔZ
Although there are some differences due to variations in the pressing force exerted by the magnetic head 17 via the magnetic sheet 13, they can be considered to be approximately the same. Therefore, the magnetic head 17 and the regulation plate 15
always have the same positional relationship.

For example, the magnetic head 17 is allowed to wear by 30 to 50 μm, and the magnetic sheet 1
Since the pressing force of No. 3 is an appropriate value of 5 to 40X 10-2 dyn/μm', the spring constant of the elastic member 33 is set such that a displacement of 50 μm gives a change in the pressing force of 5 to 40X 10-2 dyn/μm'. Set.

FIG. 3 is a sectional view of another embodiment of the present invention, and as shown in FIG. 3, the regulating plate 15 may be embedded in an elastic member 33 fixed to the regulating plate support plate 21.

Incidentally, in the above embodiment, an example was shown in which the rubber elastic member 33 was used, but a spring such as this thin leaf spring can also be used as the elastic member 33.

<Effects of the Invention> As described above in detail with reference to embodiments, according to the present invention, the regulating plate is attached to the regulating plate support, which is positioned at a predetermined position, via an elastic member. Even if the position of the tip of the magnetic head is displaced due to, for example, the regulating plate is also displaced accordingly, the relative distance between the magnetic head and the regulating plate is kept substantially constant, and a proper head touch can always be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the main parts of a rotating magnetic sheet device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of its operation, and FIG. 3 is a cross-sectional view of a regulating plate portion of another embodiment of the present invention. , FIG. 4 is a perspective view of a conventional rotating magnetic sheet device, FIG. 5 is a sectional view of the main part thereof, and FIG. 6 is an explanatory diagram of its operation. In the drawing, 13 is a magnetic sheet, 15 is a regulation plate, 17 is a magnetic head, 21 is a regulation plate support plate, and 33 is an elastic member. Patent application Agent: Fuji Photo Film Co., Ltd.

Claims (1)

[Claims] In a rotating magnetic sheet device, a regulating plate for regulating the position of the magnetic sheet in sliding contact with the magnetic head is disposed at a position facing the magnetic head while sandwiching the magnetic sheet being driven and rotated, the regulating plate facing the magnetic head. A rotating magnetic sheet device characterized in that the regulation plate is attached to a regulation plate support positioned at a predetermined position via an elastic member.