SU572848A1 - Optical store - Google Patents

Description

address and reversible counter 6, and the outputs are connected to the servomotor 10 of the carriage 2, connected in series to the amplifier 11 and the threshold element 12, the output of which is connected to the installation input of the counter 6, and the amplifier input is connected to the output of the photodetector 4.

When a new track is reached by signals from a computer, the contents of register 9 of a given address change. The comparison circuit 8 generates the error signals, which turn on the servomotor 10 of the carriage 2. The carriage 2 moves parallel to the working surface of the information disk 1. The photoelectric converter 5 generates pulses that go to the reversible counter of bats depending on the state of the phase-sensitive element 7 to increase or decrease the contents of the counter 6. In this case, the intensity of the focused beam is equal to the intensity of the beam when read, i.e. it does not cause a significant illumination of the information dis- a 1. When the beam crosses the exposed sections of the information track, the luminous flux reflected from disk 1 changes, leading to a change in the signal at the output of the photodetector 4. The change in the signal is amplified by amplifier 11 and fed to the input of the threshold element 12. At a certain level of the output signal amplifier AND threshold element generates a pulse that arrives at the installation input of counter 6 and rounds the counter contents to the nearest value that is a multiple of the step (minimum distance) between the track mi

Rounding is done by setting the lower-order triggers corresponding to the pitch between the tracks to some pre-selected state. After the termination of the pulse from element 12, the counter 6 continues (already from the new state) the count of pulses from the photoelectric converter 5.

By choosing a track recording sequence, the distance between them can be obtained quite small and the described correction of the contents of counter 6 is equivalent to entering the exact address of the track intersected by the beam into it.

In order to provide an arbitrary sequence of recording information tracks on the working surface of disc 1, uniform length tracks can be applied, spaced from one another at a distance times the distance between the information tracks.

As a threshold element, threshold schemes with a floating triggering level can be used, depending on the intensity of the beam incident on disk 1, the intensity of the light flux reflected from half of the intersected track, or depending on the maximum level of the previous signal. Thus, the insertion through the serially connected amplifier 11 and the threshold element 12 of the connection of the photodetector 4 to the installation input of the counter 6 allows the current address of the beam on the information disk to be corrected without reading or decoding any control information recorded along the tracks, which improves the accuracy determining the current address, and the absence of an additional head simplifies the device, which generally increases the accuracy and reliability of reading and writing information in the optical storage device. ystve 1.2-1.5 times.

Claims (2)

1. US patent number 3800317, class. G 11B 5/52, 1974. 2. US patent number 3821804, cl. G 11B 5/56, 1974.