JPS5846779B2 - power source - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating sheet device that spirally records or reproduces signals on a sheet that is rotated at high speed using a detection element having a recording or reproducing function. This ψ is characterized by being able to perform high-density recording.

In general, rotating seat devices attach the seat to a fixed flat plate or saddle plate (hereinafter referred to as the stabilizer) with a small gap between the seat and the stabilizer when the seat is rotated at high speed. The rotational shape of the sheet is stabilized by the resulting air viscous flow, and signals are recorded concentrically or spirally on the sheet by detection elements sent in the radial direction of the sheet by driving means such as screw shafts, spiral groove shafts, belts, etc. It performs regeneration.

Here, in order to improve the recording density on the sheet, as one method, a mechanism is required to accurately move a detection element having a small recording track width at a feed pitch comparable to the recording track width.

However, it is difficult to improve the feeding accuracy with drive means such as screw shafts and spiral groove shafts, and when sheet compatibility is taken into account, it is extremely difficult to maintain strict feeding accuracy with the above-mentioned means.

This invention uses a flat plate with a spiral feeding groove that can be stored in a cassette or the like together with the sheet and replaced.The sheet is stably rotated on the flat plate facing the feeding groove side, and a stylus is used to guide the feeding groove. Interlocking detection elements record or reproduce signals on the sheet, solving the problem of feeding errors caused by sheet replacement.

Conventionally, a method has been generally used in which signals are recorded or reproduced on a disc that is rotated coaxially with a disc having a feed groove, and a head that works in conjunction with a stylus that guides the feed groove. During recording and playback, the sheet is 1.
When the sheet is rotated at a high speed of 80 Orpm or 3600 rpm, a disk having a feed groove coaxial with the sheet is also rotated at a high speed.

Therefore, in order to reliably guide the stylus along the feed groove, a considerable force is applied to the stylus, and the feed groove must be deepened.

This becomes a major obstacle when trying to narrow the feed groove pitch in order to improve the recording density on the sheet.

Therefore, in the present invention, a spiral feed groove is formed on one side of the stabilizer plate, which was conventionally thought to be fixed, and this stabilizer plate is rotated at low speed. The sheet is rotated stably at high speed, and high-density recording or reproduction is performed on the sheet using a detection element that works in conjunction with a stylus that slides in a feed groove.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, taking as an example the case where magnetic recording is performed on a sheet.

FIG. 1 is a diagram showing the main configuration of the device.

The magnetic sheet 1 is attached to a sheet drive shaft 15 by a flange 12.
18 connected to and synchronized with the video information by the motor 10.
It is driven at high speed rotation of 00 rpm or 3600 rpm.

A feeding groove 2a having a pitch width, for example, ten times the recording pitch width, is formed in a spiral shape on one side of the stabilizer plate 2.

This stabilizer plate 2 is connected to a pulley 9 connected to the seat drive shaft 15.
The rotational speed of the seat is reduced to a constant rotational speed ratio of, for example, 1/10, through the belt 8 and the capstan 7 that is in contact with the periphery of the stabilizer plate 2, and is driven by the seat drive shaft 15 in the same direction as the seat 1. Rotate.

The magnetic sheet 1 is attached with a slight gap between the magnetic sheet 1 and the stabilizer plate 2, and is suspended and rotated by an air flow generated between the magnetic sheet 1 and the stabilizer plate 2 due to the relative speed difference between the two.

Since the direction of rotation of the stabilizer plate 20 and the direction of rotation of the magnetic sheet 10 are the same, the air flow generated in the gap is slower than the air flow generated in the conventional fixed stabilizer plate and magnetic sheet, making the magnetic sheet fluidly stable. degree will improve.

FIG. 2 is a sectional view showing a means for moving the head along the spiral guide groove 2a, taking an example of arm feeding.

The stylus 14 that slides in the feed groove 2a of the stabilizer plate 2 is attached to the arm 5, and the arm 5 is loosely fitted to the arm rotation shaft 6, so that when the stabilizer plate 2 rotates, the stylus 14 follows and the arm 5 rotates. Rotates around axis 6.

Although not shown in FIG. 2, contact pressure is applied to the feed groove 2a of the stylus 14 from the arm 5 using a leaf spring or the like, and at the end of the inner periphery of the feed groove 2a, a relief mechanism for the stylus 14 is applied to the arm 5. An initial position return mechanism has been added.

Moreover, in order to maintain the relative positional relationship between the magnetic sheet 1 and the magnetic head 3, the head support arm 4 is structured so that its angle with the arm 5 can be adjusted.

After adjustment, the squirrel 14 and the magnetic head 3 are in the following state.
The positions of the two points on the rigid body are determined, and the movement of the stylus 14 directly corresponds to the movement of the Σ magnetic head 3.

Note that 11 is a base and 13 is a bearing.

FIG. 3 is a diagram showing the relationship between the feed groove 2a and the recording track.

FIG. 3a is a radial cross-section of a spiral recording track recorded on the magnetic sheet 1, showing the recording track width, and FIG. 3 is a diagram showing a radial cross-section of the feed groove 2a. be.

The stylus 14 has a stable plate of 200 rotations and a feed pitch of P2.
Move with.

If the rotation speed ratio between the magnetic sheet 1 and the stabilizer plate 2 is n, the magnetic sheet 1 rotates n times while the stabilizer plate 2 rotates once.

Therefore, the recording pitch P1 of the magnetic head 3 on the magnetic sheet 1 is 1/n of the feeding pitch P2.

By using a magnetic head with a recording width W that is equal to or slightly smaller than the recording pitch P1, narrow track recording of 1/n of the feed pitch P2 is possible with the magnetic head 3 interlocking with the stylus 14 that guides the feed groove 2a. becomes.

As described above, according to the present invention, high-speed rotation recording can be performed at a recording pitch that is below the limit of the feed pitch and feed speed, which are limited by the molding of the feed groove and the contact conditions between the stylus and the feed groove, and By integrating the grooved stabilizer plate and the magnetic sheet into a cassette, the problem of compatibility is solved, and a rotating magnetic sheet device capable of high-density recording can be used at low cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view of a main part thereof, and FIG. 3 is a diagram showing the relative positional relationship between the feed pitch and the recording pitch. In the figure, 1 is a magnetic sheet, 2 is a stabilizer plate, 2a is a feed groove, 3
is a magnetic head, 4 and 5 are arms, 6 is an arm rotation axis, and 7
1 is a capstan, 8 is a belt, 9 is a pulley, 10 is a motor, 14 is a stylus, and 15 is a drive shaft.

Claims (1)

[Claims] 1. In a rotating sheet recording or reproducing device comprising a sheet, a stabilizing plate for stabilizing the rotational shape of the sheet when the sheet is rotated, and a detection element, the surface of the stabilizing plate opposite to the surface that contacts the sheet. A spiral guide groove is provided in the
This stabilizer plate is rotated coaxially with the seat and at a slower speed than the seat rotation, and the detection element provided opposite to the seat is
The guide groove is moved in conjunction with the sliding stylus,
A rotary sheet device characterized in that a recording or reproduction track pitch narrower than the guide groove pitch is obtained.