SU1156108A1 - Method and device for writing information on synchrodisks - Google Patents

Abstract

1. The method of recording information on synchrodisks. The synchronic drive continuously exhibits a light beam of the photosensitive surface of the synchrodisc, and phase modulates the beam of the light beam synchronously with the change in the current phase of the synchrodisc angular position, characterized in that to improve the accuracy of information recording, the synchrodisk synchrodisks are exposed by multiple passes of the light synchro rods with a light beam whose cross-sectional size in the radial direction is set to r p / n, where p -. the size of the sync path in the radial direction, an is the number (L of the synchro path passes by the light beam. sd Oi 00

Description

2. A method according to claim 1, characterized in that the speed of movement of the light beam in the radial direction and the speed of rotation of the synchrodisc change inversely proportional to the radial distance of the light beam from the center of the synchrodisk.

3. A device for recording information on sync disks containing a rotational motor, kinematically connected with angular and initial position sensors, a projection unit consisting of a series-connected radiation source, a radiation modulator and a focusing system, the first and second registers connected in series to the multiplier and the first frequency divider, the output of which is connected to the control input of the radiation modulator, and the synchronization input is connected to the output of the initial position sensor, multiply to the control inputs L and the first frequency divider are connected to the corresponding outputs of the first and second registers, and the signal input of the frequency multiplier is connected to the output of the angle position sensor, characterized in that a control unit, a third register, a first comparison unit, a second frequency divider and a counter, are entered into it, consistently

115

108

connected radial position sensor, second comparison unit, first correction unit, first power amplifier and linear motor, serially connected reference generator, third frequency divider, phase detector, second correction unit and second power amplifier whose output is connected to a control input of a rotational motor, projection the unit is mechanically connected to the radial position sensor and linear motor, the output of the radial position sensor is connected to the control input of the third divider the second input of the phase detector is connected to the output of the angular position sensor. The output of the second frequency divider is connected to the control input of the counter and the input is connected to the output of the third frequency divider, the output of the counter is connected to the second inputs of the first and second comparison blocks, the third register is connected with the first input of the first comparison unit, the input of the control unit is connected to the output of the first comparison unit, and the outputs of the control unit are connected to the corresponding information and clock inputs of the first, second and a third register and a counter.

one

The invention relates to automation and can be used for photoelectric conversion of angular displacements and their measurement.

The aim of the invention is to improve the accuracy of recording information on sync disks.

FIG. Figure 1 shows the synchrodisk structure, explaining the method of recording information on a disk using the example of recording one regular sync track; in fig. Figure 2 shows the formation of a qualitative difference in the structures of two regulating syncrodrops, exposed simultaneously and at the same time according to the proposed and well-known random methods, respectively (in Fig. 2a, the change in the tangential component of the external disturbance;

in fig. 2S is a sweep of the sync track structure recorded according to the bit-wise method; in fig. 2B-distribution of the error of the angular position of the gradations of the sync path recorded according to the bit-wise method; in fig. 22 scan sync track structure, recorded according to the proposed method); in fig. 3 is a block diagram of a device for implementing the proposed method.

The device for implementing the proposed method comprises a rotation engine 1, kinematically connected to the spindle 2, on which the synchrodisk 3 is attached to the photosensitive layer, connected to the spindle 2 angular position sensor 4 and the spindle initial position sensor 5, a projection unit 6 consisting of series-connected radiation source 7, radiation modulator 8 and focusing system 9, optically coupled to sync disk 3, control unit 10 controlling the operation of the first register 11, second register 12, third register Tra 13, counter 14 with pre-recording of information and clocked by a signal from the first comparison unit 15, the radial position sensor 16 of the projection unit 6, the second comparison unit 17, the first correction unit 18, the first power amplifier 19 and the linear motor 20 mechanically connected with a projection unit 6, serially connected frequency multiplier 21 and controlling the operation of the module - 20 torus 8, first frequency divider 22, serially connected phase detector p 23, second corrective unit 24 and second a swarm power amplifier 25 connected to the control input of the rotation engine 1, as well as a frequency generator 26 connected in series, a third frequency divider 27 and a second frequency divider 28. The output of the third register 13 is connected to the first input of the first comparison unit 15, the output of the counter 14 is connected to the second inputs of the first and second comparison units 15 and 17, the outputs of the first and second registers 11 and 12 are connected respectively to the control inputs of the multiplier 21 and the first frequency divider 22 The synchronization input of which is connected with the output 5 of the initial position, the output of the sensor 16 of the radial position is connected to the control input of the third frequency divider 27, the output of the sensor 4 of the angular position is connected to the signal input of the multiplier 21 cha Toty and to the second input of the phase detector 23, to the first input of which is connected to the output of the third frequency divider 27. Ring-closed motor 1 of rotation, spindle 2, angular position sensor 4, phase detector 23, second correction unit 24 and second power amplifier 25 constitute the following system 30 for setting speed of rotation of spindle 2, and ring-closed projection unit 6, sensor 16 radial position, second block

17, the first corrective unit 18, the first power amplifier 19 and the linear motor 20 is a tracking system 29 for setting the speed of the radial displacement of the projection unit 6.

At the initial time block

10 control sets the conditions that determine the radial position and the required number of gradations of the applied sync track: first and second registers

11 and 12, respectively, codes of numbers defining a multiplication factor of frequency multiplier 21 and

the division factor of the first frequency divider 22, the code of the number defining the initial radius of the first sync track is written to the counter 14 at the information input, and the code of the number defining the final radius of the first sync track is written to the third register 13. Then, the radial movement velocity setting system 29, operating in the positioning mode, outputs the projection unit 6 to the radial position corresponding to the initial radius of the first sync track. After the end of the transient, the output of the sensor 16 of the radial position is set to a number code equal to the initial radius to the error of the tracking system 29 in terms of the input action. The output code of the radial position sensor 16 also determines the division ratio of the third frequency divider 27, from which the signal is taken at a frequency inversely proportional to the initial recording radius. The output frequency of the third frequency divider 27 is the reference frequency for the tracking system 30 of setting the rotational speed of the spindle 2. In the steady state mode, the frequency of the signal taken from the angular position sensor 4 is equal to the frequency of the signal at the output of the third divider 27 within the accuracy of the tracking system 30 on input effects. At the same time, the signal from the third divider 27, the second frequency divider 28, passes to the counting input of the counter 14. The change of the output code of the counter 14 is monitored by the radial movement speed setting system 29 and causes the projection unit 6 to radially move.

the mode of testing a given radial displacement velocity. The speed of the radial movement of the project (5th block 6 and the speed of the actual spine of pginddel 2 vary in V. / (And the Oratio is proportional to the current:; 1k: .d .: ..:. ;; to the position of the project1k) bg.okl 6, that provide; iie.-cMrivi-; ii; j, HM by changing the output h; 1c, .- from the third divider 27 4acr; vv, j. The second divider 28 is the frequency of the sl; y-znt for proper coordination of the radial non-displacement rate of the nroektion block 6 with the speed of rotation of the spindle 2. The signal from the output of the sensor 4 of the angular position, passed the frequency multiplier 21 and the first frequency divider 22, goes to the control The primary input of the radiation modulator 8. The light signal of the radiation source 7, the passage of the modulator 8 and the focusing system 9, affects the photosensitive layer of the synchrodisk 3. The number of gradations of P that are exposed on the synchrodisk 3 is defined as (NM / I), where W - the number of output pulses of the angular position sensor 4 per spindle 2; M, O, respectively, the multiplication factor of multiplier 21 and the division factor of the first frequency divider 22. As soon as the output code of the counter 14 is compared with the number code of the third register 13, which determines the final radius of the first sync track, the first comparison block 15 outputs a signal to the control block 10, which, at this output, exposes codes of numbers corresponding to the new initial and the final radii, as well as the number of gradations of the second sync track. The described cycle repeats the required number of times equal to the number of applied sync rods. With a uniform rotation of the synchro disc and continuous radial movement of the exposure light spot, the trajectory of the light spot relative to the synchrodisk surface is an Archimedes spiral, and the gradients of the applied synchro track are formed with a radius of 1 × 1, and the radius of the synchrodisk is generated by a radius of the synchrodisk, and the radius of the synchrodisk exposed sections of this helix,

FIG. 1 illustrates the proposed method by the example of forming a structure of one regular sync path.

Exposed areas are shown by thick lines, the width of which corresponds to the radial size of the exposure light spot, and the dotted line marks the light path of the light spot between areas adjacent in the tangential direction. For clarity, a case is conventionally shown when the radially adjacent exposed sections do not overlap each other. In fact, with the restrictions on the speed of the radial movement of the exposure light spot, the formation of a threshing beam is observed; ifaix of the radial sections so that it forms a solid, and, ke is intermittent (as shown in Fig. 1) the structure of gradations.

The most important p. -.Vru, ecT: 70M of the proposed PS method. Rel. (:: 1; 1 to the resolution method is a higher displacement coefficient; IlIennost J and, as a result, the increased accuracy of applying the angular position of the gradations of sync tracks, this is explained the fact that the majority of possibilities in the process of recording has a weak effect on the accuracy of applying the angular position of the gradations, and manifests itself only in the distortion of the profile of the applied grl, -1ats. Due to the high speed of exposing the narrow radial zones characteristic of the considered method and the fact that the gradation profile is formed by multiple imposition of radially adjacent exposed areas — sections of the Archimedes spiral — the action of short-period and impulse disturbances (for example, random alarms of the recording system) leads to errors in the formation of not just the gradation profile, but only those radial areas gradations, which were exposed during the action of the disturbance. For the same reasons, the large-period and slowly varying movements and (the change in the linear dimensions of the installation units for recording with temperature changes, de-alignment of the nodes under the action of internal stresses, departure of the spatial position of the light beam, etc.), the period of change or the time of action of which is comparable or longer than the exposure time of the sync track, results in the same distortion of the profile of all of them at once (and not portions as in the order of a method of gradation, but practically do not affect the phase modulation of the spatial frequency of the gradation following, i.e. on the scatter of the applied angular position of the gradations relative to their calculated ideal position. In order to illustrate the above, we consider the appearance of an external perturbation leading to a spatial shift of the light spot relative to the center of rotation of the synchrodisc in the process of synchronizing the path. The departure of the light beam in the tangential direction by the value of Bj is accompanied by the occurrence of an error of 0 causing the current angular position of the gradations: 6 / R, where R is the current radius of the sync track record. For the sake of consistency, we compare the structures of two synchro tracks recorded simultaneously at the same time (it can be shown that the performance of the compared methods is the same in the first approximation) and on the same radii for the bitwise and proposed recording methods. Suppose that the action of a perturbation in both cases leads to the same spatial displacement of the light spot relative to the axis of rotation of the synchrodisk. Let us take the following notation (Fig. 2): fc, OS, R, respectively, the temporal angular and radial coordinates; 6 - error of the plotted angular position of the gradations of the sync path; N is the number of applied gradations of each sync track; TO -. total exposure time of each sync track; the time per exposure of one gradation of a sync track by bitwise recording method I - the period of one rotation of the synchronic according to the proposed recording method; П TO / T the total number of revolutions of the workpiece during the recording time T of the sync track according to the proposed method; p P, respectively, the initial and final radii of the sync tracks. Then, if during the recording time TO, some external disturbance (Fig. 2q) was in effect, causing a displacement of the exposure light spot and having a tangential component ig-p with respect to the rotation center of the synchrodisk; the radial component of the perturbation does not affect the accuracy of applying the angular position of the gradations), when recording a sync track according to the serial method, the effect of compensation leads to direct phase modulation of the spatial frequency of the gradations of the recorded sync track (Fig. 2§), and the gradation profile is not distorted. On the contrary, when recording a syncrod track according to the proposed method, the action of a disturbance ... affects only the distortion of the profile of the applied gradations (Fig. 22.), but does not lead to a deviation of the spatial frequency of the syncrod track gradations. Thus, if, with a pore of an erroneous recording method, the action of a disturbance spreads in the tangential (and, therefore, in the angular) direction, and has a direct impact on the accuracy of applying the angular position of the gradations (Fig. 2§), then using the proposed method it spreads in the radial direction and therefore has a smaller effect on the accuracy of the application of the angular position of the gradations. The resulting distortion of the gradation profile (Fig.) Is not significant in photoelectric converters, since subsequent reading of information from the sync track using photoelectric reading devices (rather than visually) integrates the angular position of the gradations across their radial width. At constant values of the focused light flux, the angular speed of rotation of the synchrodisk and the speed of the radial movement of the light spot to different radial zones of the exposed synchro track, there is a different exposure of the photosensitive material, which then manifests itself in a different optical density of the synchro track structure. To eliminate this drawback, the exposure of the photosensitive material should remain unchanged, which can be achieved by simultaneously changing the speed of rotation of the synchronic and the speed of the radial

l

Wi

about

RI

the displacement of the exposure light spot is inversely proportional to the current radial position of the light spot (at a constant total power of the radiation source).

18th

Sbix

28th

5yu.

Llz

2.J

7

Sh

Ux

N / 47

Claims (3)

1. A method of recording information on synchro-disks, which consists in exposing a light beam to the photosensitive surface of a synchro-disk during its continuous rotation and phase modulation of the light flux of the beam synchronously with a change in the current phase of the angular position of the synchro-disk, characterized in that, in order to increase the accuracy of recording information, exposure of synchro-tracks the synchrodisk is carried out by repeatedly passing the photosensitive surface of the synchrocks with a light beam, the cross-sectional dimension of which is radially direction is set equal to m r ϊ r | n, where p - sinhrodorozhki size in the radial direction, and η - sinhrodorozhki number of passes the light beam. SU .. „1156108 2. The method according to π. 1, characterized in that the speed of movement of the light beam in the radial direction and the speed of rotation of the synchrodisc is inversely proportional to the radial distance of the light beam from the center of the synchrodisc. 3. A device for recording information on synchrodisks containing a rotation motor kinematically connected to the sensors of angular and initial positions, a projection unit consisting of a series-connected radiation source, a radiation modulator and a focusing system, first and second registers, a multiplier and a first frequency divider connected in series the output of which is connected to the control input of the radiation modulator, and the synchronization input is connected to the output of the initial position sensor, to the control inputs of the multiplier I and the first frequency divider are connected to the corresponding outputs of the first and second registers, and the signal input of the frequency multiplier is connected to the output of the angular position sensor, characterized in that a control unit, a third register, a first comparison unit, a second frequency divider and a counter are connected in series radial position sensor, second comparison unit, first correction unit, first power amplifier and linear motor, reference oscillator connected in series, third frequency divider, phase a detector, a second correction unit and a second power amplifier whose output is connected to the control input of the rotation motor, the projection unit is mechanically connected to the radial position sensor and the linear motor, the output of the radial position sensor is connected to the control input of the third frequency divider ⁷ , the second input of the phase detector is connected to the output angular position sensor, the output of the second frequency divider is connected to the control input of the counter, and the input is connected to the output of the third frequency divider, the output of the counter is connected nen with the second inputs of the first and second comparison units, the output of the third register is connected to the first input of the first comparison unit, the input of the control unit is connected to the output of the first comparison unit, and the outputs of the control unit are connected to the corresponding information and synchronization inputs of the first, second and third registers and counter .