SU1188782A1 - Device for moving recording-reproducing head in information store - Google Patents

Abstract

1. A DEVICE FOR MIXING THE HEAD OF RECORDING-PLAYBACK IN THE INFORMATION DRIVE, which contains a linear stirring motor, which consists of a winding installed in a permanent magnet ring gap, one pole of which is located inside the winding and another a winding wound on a carriage with a recording-reproduction head fixed on it, characterized in that, in order to increase the accuracy and speed of movement of the recording-reproduction head, the pole is constant The inside of the winding magnet is made in the form of a guide cylinder of the linear aerostatic bearing i with external supercharging and is equipped with nozzles with inserts of porous material. (L 2. The device according to claim 1, characterized in that the nozzle inserts are made of titanium sponge. 00 00 00 th

Description

The invention relates to instrumentation and can be used in the technique of recording and reproducing information, for example, in video recording and in disk storage devices.

A known node for moving the recording-playback element in a disk drive, comprising a carriage on rollers with blocks of magnetic heads fixed on it, moved by means of a separate multi-speed hydraulic system 1,

This device is relatively complicated and does not provide a sufficiently high recording accuracy.

A known node for moving a recording-playback element in a disk storage device, in which a carriage with a recording-playback element is installed with a possibility of moving along a disk radius on an airwell 2.

However, this device is also relatively difficult and has a low speed.

A known node for moving a recording-playback element in a disk storage device in which a second carriage 3 is movably mounted on the main carriage.

Such a device is also relatively difficult.

Closest to the invention is a device for moving a recording-reproducing head in an information storage device, comprising a linear movement electric motor located in a housing with a lid consisting of a winding installed in a constant-gap ring gap, one pole of which is located inside the winding, and the other covers outside the winding wound on a carriage with a recording-reproduction head fixed on it 4.

The known device is characterized by insufficient accuracy and speed of movement of the recording-reproduction head.

The purpose of the invention is to increase the accuracy and speed of movement of the recording-reproduction head.

The goal is achieved by the fact that in the device the pole of the permanent magnet inside the winding is designed as a guide cylinder of a linear aerostatic bearing with external pressurization and provided with nozzles with inserts of porous material.

Nozzle inserts are made of titanium sponge.

The drawing shows a structural diagram of the proposed device.

The device consists of a housing 1, made in the form of a cup, closed by a cover 2. In cylindrical holes in the bottoms of the housing 1 and the lid 2, a guide cylinder 3 is mounted on which the movable part 4 of a linear type electric motor is made in the form of coils wound on a carriage 5 on which the recording-reproduction head 6 is fixed. The fixed part of a linear-type electric motor is made in the form of an annular permanent magnet 7 fixed inside case 1. One pole of the magnet is outside, the other is inside the ring. In this case, the walls and the bottom of the housing 1 and the guide cylinder, made of ferromagnetic material, serve as a continuation of the pole of the ring-shaped magnet 7 so that this pole goes inside the coils. The guide cylinder 3 and the carriage 5 form a linear aerostatic bearing with external

5 by supercharging, for which nozzles with inserts of porous material 8 are arranged on the surface of the guide cylinder 3, as which can be used spongy titanium or another material with a size of 17–50 µm, which allows air to pass through well. The part of the guide cylinder 3 facing the side of the carriage 5, where the recording-reproduction element b is fixed, passes into two flat aerostatic supports, also equipped with nozzles with inserts of porous material 9. There is a stabilizer 10 on the supports. channels for air supply in the cavities, which are located under the inserts of porous material. The bottoms of the cup body 1 and the cover 2 are provided with rubber shock absorbers 11 and 12. The drawing shows a diagram of the device with an optical head that provides for recording high-density laser beam 13 on the surface of a glass disk covered with a photosensitive layer 14 in the form

5 tracks 15. In order to control and implement the movement of the head and reproduction of the required recording track, the coils of the moving part 4 of a linear type electric motor are connected to the control unit 16

0 flexible conductors.

The device operates in two modes: positioning and tracking the selected track. Due to the small amount of friction between the moving parts and the small mass of these parts, a large speed response is provided. The accuracy of movement is enhanced by the absence of gaps between the moving parts of the backlash and dry friction.

The use of porous inserts 8 and 9 also improves the accuracy of mixing, and the speed is increased due to the fact that the flow of air coming out of the nozzles of the aerostatic bearing pads bathes the carriage 5 and promotes heat removal from the coils.

5 pi

During the operation of the head displacement unit

the carriage 5 can occupy all possible positions, with some of the nozzles exerting. 1188782.

34

with FULLY or partially open. Presence of vibrations and consistency

chie inserts 8 and 9 of porous material, air.

for example, from titanium sponge, when the proposed device is compact,

In their entire surface, the direction of th-provides an increased accuracy and a fast cylinder provides a steady action of moving the recording head to reconstruct the aerostatic bearing, from-5 to the product.

Claims (2)

1. DEVICE FOR MOVING A RECORDING-PLAYING HEAD IN THE INFORMATION DRIVE, comprising a linear displacement motor located in a housing with a cover, consisting of a winding installed in an annular gap of a permanent magnet, one pole of which is located inside the winding, and the other covers the winding wound on the outside with a recording-playback head mounted on it, characterized in that, in order to improve the accuracy and speed of movement of the recording-playback head, the pole of constant the shield inside the winding is made in the form of a guide cylinder of a linear aerostatic bearing with external pressurization and is equipped with nozzles with inserts of porous material. 2. The device according to π. 1, characterized in that the nozzle insert is made of sponge titanium. >