Optical storage device

 

(57) Abstract:

Usage: in industry, in particular, in the optical recording and/or reproduction of information. The inventive optical storage device contains optically coupled to the laser optical unit, a micro and a cylindrical hermetic storage medium, placed in a cylindrical container filled with liquid or gaseous environment, the stator drives the rotation and positioning of media, mechanically fixed to the cylindrical container, the electronics, the interferometer consisting of optically coupled laser, collimator, beam-splitting plate, beamsplitter cube, two photodetectors, the base of the interferometer, including the compensator and the mirror, the measuring arm of the interferometer, made in the form of autorefractor, which consists of lenses and mirrors installed in its focus, and placed in one body with the rotor drives the rotation and positioning of the media. Autorefractor is located inside the cylindrical container and is mechanically connected to a movable storage medium. 4 Il.

The invention relates to instrumentation, canenero computer storage devices and measuring systems for various purposes, in which the measured value is represented in the form of repetitive increments.

Known optical storage device that contains the media information, the lens mounted on the positioner, the laser interferometer, the optical block, the drive rotation of the storage medium and the electronic unit [1] Search for a desired piece of information in this unit is carried out by positioning the lens in a predetermined area of the storage medium. The control lens shift is performed using a laser interferometer.

The disadvantage of this optical storage device is a low information density, which is due to lack of tracking the position of the media relative to the lens when applying the reference tracks.

The closest in technical essence is an optical storage device that contains a laser, a light modulator, an optical unit, a micro and a cylindrical information carrier with a drive of its rotation, placed in a cylindrical container filled with liquid or gas medium, and the positioner [2] Recording of information is made by punching a photosensitive layer sa is the low information density. This is because when marking reference tracks there is no monitoring of the situation of the media and are not compensated his vibrations along the axis of rotation. Therefore, to support the tracks do not overlap, the required increase in the period of their application.

The essence of the invention lies in the fact that in the optical storage device containing optically linked to the laser optical unit, a micro and a cylindrical hermetic storage medium, placed in a cylindrical container filled with liquid or gaseous environment, the stator drives the rotation and positioning of media, mechanically fixed to the cylindrical container, the electronic unit, inputs of the interferometer, consisting of optically coupled laser, collimator, beam-splitting plate, beamsplitter cube, two photodetectors, the base arm of the interferometer, including the compensator and the mirror, the measuring arm of the interferometer, made in the form of autorefractor, consisting of lenses and mirrors installed in the lens focus, and placed in one body with the rotor drives the rotation and positioning of the media, and autoreplace the feature of the invention is illustrated by drawings.

In Fig. 1 shows a simplified section of the inventive optical storage device; Fig. 2 schematically shows the design of the interferometer of Fig. 3 cut autorefractor; Fig. 4 functional diagram of the electronic unit. Optical storage device (Fig. 1) consists of an optically coupled laser 1, the optical unit 2, a micro 3, the container 4 filled with a gaseous or liquid medium 5, for example, the immersion liquid, a cylindrical airtight storage medium 6, on the inner surface of which is applied the nonvolatile coating 6, the interferometer 7, motor rotation, consisting of a stator of the motor rotation of the information carrier 8 and the rotor of the motor rotation 9, the linear motor positioning device consisting of a stator of the linear motor positioning 11, the measuring arm of the interferometer of autorefractor 12, the connecting line 13 and the electronic unit 14 consisting of a personal computer 33, controller 34, converters current-voltage 28, Comparators 29, block pulse shaping addition and subtraction 30, analyzer block transfer process 31 and the engine control unit of positionyou is the engine for rotation of the information carrier 9 and the rotor of the linear motor positioning 11 is mechanically connected with autoreflection 12, and the stator of the motor rotation 8 and the stator of the motor positioning 10 is mechanically fixed to the side surface of the container 4. In the cut ends of the container 4 with holes which are connected to the connecting line 13. At one end of the container 4 is installed transparent window 15, the other end closed by sealed tube 16.

In Fig. 2 schematically shows the design of the interferometer, consisting of optically coupled laser 17, the collimator 18, the beam-splitting plate 19, a transparent window 15, immersion environment 5, autorefractor 12, compensator 20, the mirror 21, beamsplitter cube 22, photodetectors 23.

In Fig. 3 shows a longitudinal section of autorefractor, consisting of a cylindrical body 24 and placed in it optically coupled PLANO-convex lens 25, is facing a flat surface outside mirror 26 mounted in the focus of the convex lens 25, the rotor of the motor rotation 9 and the rotor of the linear motor positioning 11. Case autorefractor 24 is mechanically connected to the information carrier 6 by means of a coupling 27.

In Fig. 4 shows a functional diagram of the electronic unit, consisting of a transducer t is moving 31, site control the rotation motor 32, the PC 33 and the controller 34.

Optical storage device (Fig. 1) works as follows. Recording of information is carried out through the perforation by laser radiation of the recording cover 6', or by changing the phase state. Recording cover 6' is applied to the inner surface of the tubular substrate sealed cylindrical information carrier 6. Reading of information is carried out by radiation of lower intensity. Cylindrical hermetic storage medium is rotated by an electric motor rotation 8, the rotor 9 which together with the rotor of the linear motor positioning 11 is fixed in the housing autorefractor 12 and connected with a cylindrical hermetic storage media 6.

When positioning a cylindrical hermetic storage medium 6 is moved in the direction of its longitudinal axis by means of motor positioning. The position of the rotating cylindrical information carrier 6 is determined by means of the interferometer 7 accuracy /4 Beam semiconductor laser 17 (Fig. 2) passes through the collimator 18, which forms a parallel beam, and is the analy. One part of the radiation is fed into the measuring arm of the interferometer and passing through a transparent window 15, the layer immersion medium 5, enters autorefractor 12, which provides the reflection of the beam in the opposite direction. The use of autorefractor as a reflecting element in the measuring arm of the interferometer allows to make it not sensitive to the angular tilt of the reflective element arising in the course of its rotation. Further, the beam again enters the beam splitting plate 19. Another part of the radiation enters the base of the shoulder, runs the compensator 20, which serves to align the optical paths in both arms of the interferometer, and reflected from the mirror 21, also falls on the beam splitter plate 19. The interference pattern resulting from interference of the rays coming from the base and measuring shoulders, analyzed by the photodetectors 23, mounted in the plane of observation of the interference pattern in such a way as to receive electrical signals shifted in phase by a quarter period, which is necessary to determine the direction of movement of autorefractor 12 and, accordingly, the storage medium 6. Electrical signals are sent to the electronic unit 14 (Fri 29. Reinforced and shaped signals from the outputs of the Comparators come to the unit pulse shaping addition and subtraction 30, the output of which is formed of a sequence of short rectangular pulses corresponding direct +V and V the movement of the information carrier. For the period of the input signal at the output of driver 30 are formed four pulse, which allows to increase the accuracy of measuring the position of the media four times, and which reaches values /4 which can, in turn, increase the density of information and reference tracks on the storage media. Output +V block 30 is connected to the "+" input and the output V is connected to the "-" input of the analyzer process of moving the information carrier 31, and the input of this block is supplied from the personal computer 33 through the controller 34 code number of tracks that you want to make the movement of the information carrier. The output signals of the analyzer 30 to the direction of movement (" Ue.g." in Fig. 4) and velocity (VAC" in Fig. 4) are fed to the inputs 1 and 2 of the engine control unit positioning 32, which generates the control signals for the stator of the electric motor positioning (Vpanel" in Fig. 4).

 

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