SU733011A1 - Device for magnetic recording on flexible disc - Google Patents

Description

(54) DEVICE FOR MAGNETIC RECORDING ON FLEXIBLE DISK

I

This invention relates to instrumentation engineering, in particular to floppy disk storage devices.

A device for recording information containing a flexible disk mounted in the hub on the drive shaft and located above the base base, made with a double-sided bevel from the center to the periphery and a transverse slit, as well as magnetic heads mounted in it along the radius of the disk 1.

The main disadvantage of this device is the low global stability of the flexible disk, since it rotates above the base with a two-sided bevel and bends in diameter. Its dynamic state when performing such a complex trajectory and due to the formation of vortex flows is unstable, the flexible disk makes significant fluctuations and the local zone in the place of its bend does not have reliable rigidity and sufficient straightness. Consequently, the working gap between the flexible disk and the magnetic heads is not very accurate and of high constancy.

The closest to the invention to the technical essence is a device for magnetic recording on a flexible disk containing magnetic heads mounted in a base plate along its radius, a hub on an electric motor shaft with a flexible disk fixed in a keP, and also two piezoelectric converters connected to generator 2.

In this device, the gap between the flexible disk and the heads in the plate is not stable enough. Some changes in the gap between the plate and the disk are caused by axial oscillations of the drive and extraneous disturbances, creating significant distortions and vibrations of the disk itself. Consequently, the working gap is unstable and relatively large in size, and the resulting oscillations of the flexible disk are the cause of these disadvantages.

The aim of the invention is to reduce the spatial oscillations of a flexible disk.

Claims (2)

This goal is achieved by the fact that the known device for magnetic recording on a flexible disk is equipped with two flexible rings fixed coaxially on opposite sides of the flexible disk around the perimeter of the hub. at the same time, piezoelectric transducers are placed diametrically opposite on the outer surface of one of the flexible rings, in line with the magnetic heads. The drawing schematically shows this device. It contains a flexible magnetic disk 1 fixed in the hub 2 on the shaft 3 of the drive 4 and located on top of the base plate 5 in which the magnetic heads 6 are mounted. In the hub 2 along its perimeter there are rigidly fixed two flat, elastic ring elements 7 mounted into the mating with a floppy disk 1 on both sides. On the one hand of the ring elements 7, for example, from the top, two piezo transducers (piezoceramic vibrators) 8 are fixed in diameter and connected by means of the current collector 9 to the power supply unit 10. The actuator 4 is located on the lower side of the base base 5, which is mounted on the housing 11. The device operates as follows. The flexible magnetic disk 1 rotates from the drive 4 and is positioned above the surface of the base plate 5 and leveled. At the same time, an alternating voltage of a certain frequency, shifted by 180 °, is connected to the plates of piezoceramic vibrators 8 fixed to elastic ring elements 7 by means of a current collector 9 from power supply unit 10. The resulting mechanical asymmetric oscillations of piezoceramic vibrators 8 are directed perpendicular to the plane of rotation of the flexible disk 1 and, therefore, lead to similar oscillations of elastic ring elements 7. The latter excite oscillations of the flexible disk 1, which, depending on the ratio of the parameters of the angular mass velocity and system rigidity and an exciting frequency, they create a wave that is standing according to the diameter of the disk. This wave has an increased hardness and its oscillations practically do not appear. Therefore, the working gap between the flexible disk 1 and the magnetic heads b mounted in the base plate 5 is kept constant. Excitable vibrations of the flexible disk, contributing to the emergence of a standing wave, simultaneously protect the device from unwanted vibrations. The invention is a device for magnetic recording on a flexible disk containing magnetic heads mounted in a base plate along its radius, a hub on an electric motor shaft with a flexible disk fixed in it, as well as two piezoelectric converters connected to a generator, characterized in that, in order to reduce vibrations of a flexible disk, the device is equipped with two flexible rings, fixed coaxially with opposite sides of the flexible disk around the perimeter of the hub, while the piezo transducers are placed in diameter no oppositely on the outer surface of one of the flexible rings, aligned with the magnetic heads. Sources of information taken into account in the examination. 1. French Patent No. 2167258, cl. G 11 B 17/00, published 1975. 2. USSR author's certificate No. 598125, cl. G 11 B 25/04, 1976 (prototype).