SU1053156A1 - Method of optical recording of information on disk medium - Google Patents

Abstract

An OPTICAL RECORDING METHOD OF INFORMATION ON A DISK MEDIUM, which consists in modulating a beam of light radiation with recorded information, fixing and directing to a sensitive surface of a carrier, with constant angular velocity, and vibratingly displaced with a frequency of a control signal, with a wave pattern. In order to simplify and increase the reliability of the information recording-reproduction process, the oscillatory movement of the beam is carried out in the direction making an acute angle with the direction of the tangent hydrochloric .informatsionnoy to the track at the point pgscheni focused light beam on the disk medium.

Description

The invention relates to the field of accumulation of information, in particular, to recording information in connection with optical radiation and can be used in the mouth; recording and recording audio and video information from a focus on a rotating carrier /

There is a known method of recording information on the Eriltsakgts is carrier, with xtoos / ms, tsulirov2N-. information, r; urskuyu ieliuchek focusing on naira.vly on rotating carry; d) b, as a result of which disistodit write information in the form of a circular dorakkk with section-ka, and having different co: gff: tsyeng from razheni or skip or difference other optics. Erakristiicax, npH4ei i information is encoded with a length recorded at aogkov and npcjvfelu of a day mezkdu them. 1J,

The disadvantage of this method is that in order to reproduce the recorded tracks and information, it is necessary to use slora optical systems to ensure operability. devices next; ке1-1и - -: but in the information track r nocKoJibii THIS way is not provided for | rl; -3aat. oparatstch .. POSE.OLYA} (L, TSIH at soc.ispy: -. create a simple and track tracking device,; For example; 1. h.provide the high-quality combi-gos. to produce expensive goods (g .or.; atski ;. fis.PIS. ANNUAL EHRNS, CAMP; 0.G

optical alignment system from the scans / d slider beam of the p-operek track to obtain a device control signal

track the track noMexoyc.Tort Ffi vi "1 by synchronous detection, or use a circuit with two

With an optional OPTICAL bundle for the next ;; e; l1 5 .j,.:;.:; - ::;: .. ioH information,

Closest to u; according to technical specifications; essence and obtain the result. to the invention of the vklaks / g method of recording information from the order of information is that C | 1 okushiroEakk; d;. i zakisyBa; o.kay ray, fashion ztiroEanky; nforg1atsvky direct kraskuyutsiyu carrier, and moving from a small amplitude (a bit of 10--20% of the Arins of the track) with the frequency of the counter signal along the disk radius ... bpoi.ie addition, in the process of recording p. - and information is predicted from the control - by the signal, the frequency and the phase of which coEp. with the frequency and phase of the cobalt beam, and this is the total. the signal .mo.duliruet the intensity of the za.

When Eosproyzdedek.i recorded in such a way, the information from the signal of ikformadiy, conversion conversion int

the read light beam extracts a reference frequency signal, which serves to synchronously detect the reproduction signal envelope. sigkalo .a infor.atsii and out of range. the carrier allows you to create a simple (one-way without additional scanning of the read beam) aptisgation system for reproducing information, which allows you to create a reliable way to do this; Aeki track 2J. N / adostatko; The known method is its complexity, consisting in the presence of -. 1; and the operation, the descent of the pilot signal with the signal. information, moreover, in the case of the input of the information recorded data; way, the tracking device. for track. has an error that reduces the accuracy of reproduction. NIN., This is due to the fact that, in order to ensure accurate work, it is necessary to render all ::. matching phase; ko -; tolkogo signal, recording with 1- (nfori, key, oscillation phase. the recording instruction that gfy implementations of the method requires an additional adjustable phase support, because the actuator, osushhestzl: -: - with; records, has a delay, which, moreover, may change with time when changing, for example, the environment tehsheratura. As a result, there is an error in the running yCT.Jc.Bc: Ti.a of tracking the track.Ce. l.: b; o from the image of Yeltsa-pprsschenka and increase the reliability of the process 35PiSi-play and info. The delivered value is achieved by the fact that with the hl.bl.b. the method, concluded with the fact that the light beam is modulated by the recorded information, focused and directed to the sensitive surface of the carrier, rotating with a constant angular velocity, and oscillatingly moving with, the frequency of the control signal, - cribber-like movement of the beam is made in the direction, - was:; .Erf / acute angle with the direction tangential to the information track at the point of incidence of the focused light beam on the disk-1 carrier ,,

On ,,, FIG ,. 1 shows the principal dkeMa of the device for implementing the proposed method; in fig. 2 view L in figure 1. The device contains a source of 1 commercial radiation, a modulator 2, a modulator control unit 3, a beam splitter 4, a rotating mirror 5 and a lens b located in the optical head 7, the sensitive surface 8 of a disk carrier 9 ,. They each have an axis 10 of rotation, a generator of II control signals, an actuator 12 for swinging the mirror, a photo-receiver 13, a filter 14, a phase converter 15, an envelope detector 16, a blue detector 17, an amplifier 18, and an add-on displacement mechanism 19; NIN optical head. The device works as follows. The beam of light emitted by source 1 is modulated by the recorded formation of the r-jodulator 2, which is controlled by the control unit 3, and, after passing the beam splitter 4, is directed noBopoTHbJM by the mirror 5 to the lens 6, the focus beam is the light beam on the sensitive surface 8 of the disk carrier 9, vrahdakdegos. around the axis 10 revolutions with constant angular velocity and Mirror 5. optical head 7 oscillates around the xx axis with a small a small angle in the direction making an acute angle 0. from the tangent of the op-amp to the information track at the point O of the fall of the recording light beam. The oscillation of the mirror 5 is carried out using an actuator 12 to which a signal is supplied from the generator 11 of the control signal. If f is the focal length of the lens 6, then the amplitude of the movement of the focused beam in the plane 8 of the disk carrier is equal to where the angle that the mirror 5 rotates the actuator mechanism 12, then the axis displacement component of the beam I in the direction of the radius of the disk I (across, tracks ) 1 is equal to. 2f oi. A biased displacement. Towards a tangent to the track (along the tracks, 2f. Thus, when applying the control frequency signal to the mechanism 12, a wavy path is recorded, the axis of which periodically shifts from the concentric circle by 2f-e; hi The sini $ r ea information recorded along the track is superimposed by frequency modulation, since the relative speed of movement of the recording beam carrier periodically, in sync with the lateral displacement of the track, changes with the frequency of the same pilot signal. The speed of change is equal to Y 9, where m is the period of the control signal. When playing the recorded information, the light beam reflected from the sensitive surface 8 of the disk 9 travels in the opposite direction of the research institute lens 6, mirror 5 and is reflected to the photoreceiver 13 by a splitter 4. reproducing; - control from the control unit 3 to the modulator 2 is given a signal, the lower power of the readout beam, In the read signal, a control frequency signal appears, which is extracted by the filter 14 from the signal and a photodetector 13, which converts the modulation of the reflected from. drive light information beam into the electrical signal read information. The detector 16 selects the envelope of the read signal, which is synchronously detected in the synchronous detector. 17 by means of a control frequency signal separated by filter 14. The signal from the output of filter 14 to the synchronous detector 17 is fed through a phase shifter 15, which shifts the phase of the control signal by 90. since during the recording the reference frequency signal modulating the frequency of the information signal is proportional to the change in velocity, which is derived from the displacement, i.e., shifted in phase by 90 °,. . If the read beam exactly follows the axis of the track, then the bend will be modulated with a double reference frequency, and the synchronous detector 17 will give zero voltage on the input. When the center of the readout beam deviates relative to the axis of the track, the control frequency signal appears in the envelope signal, the phase of which corresponds to the direction of the track displacement, which is represented by the synchronous detector 17 in the form of a control signal supplied through. the amplifier 18 to the actuator 19, the transducer optical head 7 along the radius of the disk, to compensate for the readout of the dirty spot from the track. In the device, the receiver offers a method of recording, apparently matching the frequency and phase of the track track in the radial direction to the frequency and phase of the control frequency signal, which modulates the information signal achieved using additional tools that compensate for the inertia of the actuator required in the known device.

Possible changes in the frequency of oscillations of the swivel mirror 5, which can occur, for example, when environmental conditions change, are equally affected by both the lateral displacement of the track and the modulation frequency of the information signal, which does not affect the accuracy of the tracking control signals. when playing.

The image creature does not change when using other options for reatisfying the pre-burned method, for example, with a read-through transmission or a beam oscillation device during recording, performed on a different principle or located elsewhere in the circuit.

The use of the device, realized by the proposed method, will allow to simplify the design of the optical system and increase the reliability of reproducing information by creating a noise-resistant tracking track.

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Claims (1)

454) (57) METHOD OF OPTICAL RECORDING OF INFORMATION ON A DISK DRIVE, which consists in the fact that the beam of light radiation is modulated by the recorded information, · fix ΪΓ is directed to a sensitive surface of a carrier rotating at a constant angular velocity, and is oscillatedly moved with a control signal frequency, characterized in that, in order to simplify and increase the reliability of the information recording-reproduction process, the beam is oscillated in a direction that is an acute angle with the direction tangent to the information track at the point of incidence of the focused beam of light radiation on the disk medium.