Abstract: A device for display of information has a receiver-amplifier unit connected to a source of an information signal, horizontal and vertical scanning generators, a converter of the signal into the displayed image, which is connected to the horizontal and vertical scanning generators, an output amplifier, a detector of image contours, connected to the receiver-amplifier unit, a threshold unit connected to the image contour detector, a control signal generator connected to the threshold unit and the output amplifier. Thus, complete scanning beam arrest is accomplished.

Abstract: An information storage device, has a container and at least two identical tical information carriers arranged coaxially inside the container and adapted for independent rotation in relation to each other. Each optical information carrier has a hollow cylindrical base made of a material transparent for laser radiation and a recording layer applied on this cylindrical base.

Abstract: An optical storage device has an optical information carrier placed in a container filled with an immersion fluid, at least two stationary optical elements disposed on transparent portions of the walls of said container, and associated with optical heads each head having a source of modulated coherent radiation, a movable optical element, a beam splitter, and a photodetector. The optical storage device is linked with an external information computer system by means of a control unit connected to the photodetectors and sources of modulated coherent radiation. Each photodetector is connected to an autofocusing unit whose output is kinematically coupled with the movable optical element, while one of the photodetectors is connected to a track switching unit connected to a track tracing unit. The control unit is connected to the track switching unit and the track tracing unit is connected to an information addressing unit kinematically connected with the optical information carrier.

Abstract: An optical memory includes a storage for optical data carriers, a means for transferring data carriers from the storage to one or several stations for data recording or reading, a modulated electromagnetic radiation source and photodetectors which are optically connected to the carriers, and a switching unit for switching the modulated electromagnetic radiation from the source to the optical carriers and from the carriers to the photodetectors in accordance with the address of the station where a respective carrier is disposed.

Abstract: An optical information carrier includes a cylinder (1) with a recording layer (2) and bushings (3,4) located at butt ends of the hollow cylinder (1) and insulating the recording layer (2) from the environment. A method for erasing information recorded on the optical carrier uses a high-frequency electrical discharge produced inside the air-tight closed space (5) of the hollow cylinder (1). An optical storage device realizing the method includes an erasing unit (11) having a circuit for initiating a high-frequency discharge, which has electrodes (12,13) between which the optical carrier (10) is located so that the high-frequency discharge is initiated inside the closed air-tight space (5).

Abstract: A method for photothermal information recording, reading and erasing consists in that the surface of a recording medium (1) is charged prior to the photothermal recording process and then exposed, during photothermal information recording and erasing, to a modulated electromagnetic beam (8) localized to a spot size of the order of one information unit with the energy exceeding the energy required for softening the material of the recording medium (1), and, during information readout, with the energy less than that for softening the material of the recording medium (1), the surface of the recording medium (1) being discharged before erasing information.

Abstract: A method of erasing information recorded on an optical carrier which incls an air-tight space having a recording layer on the inner surface thereof, fills the air-tight space with a gas inert in relation to the material of the recording layer and to the material of the carrier under a pressure selected from a range from 10 to 10.sup.3 kPa, and, after the heating process is discontinued, the recording layer is regenerated.

Abstract: An optical information carrier includes a cylinder (1) with a recording layer (2) and bushings (3,4) located at butt ends of the hollow cylinder (1) and insulating the recording layer (2) from the environment. A method for erasing information recorded on the optical carrier uses a high-frequency electrical discharge is produced inside the air-tight closed space (5) of the hollow cylinder (1). An optical storage device realizing the method includes an erasing unit (11) having a circuit for initiating a high-frequency discharge, which has electrodes (12,13) between which the optical carrier (10) is located so that the high-frequency discharge is initiated inside the closed air-tight space (5).

Abstract: Disclosure is made of an optical memory wherein a cylindrical information carrier (2) is disposed in a stationary cylindrical container (14) filled with a liquid or gaseous medium transparent for the radiation flux emitted by a source (1) of modulated coherent radiation. The cylindrical information carrier (2) is equipped with a rotational drive. A recording coating (12) is applied on a tubular base (11) of the cylindrical information carrier (2). The cylindrical information carrier (2) is optically connected with the source (1) of modulated coherent radiation and with an addressing unit (3) arranged so that its optical elements can move axially with respect to the cylindrical information carrier (2).

Abstract: Disclosure is made of an optical storage device wherein a cylindrical information carrier (2) with a recording medium (12) applied on a tubular base (9) is disposed in a stationary cylindrical container (3) having a window (4) in the lateral wall thereof. A lens (5) is secured in the window (4) of the cylindrical container (3) to let through the radiation flux from a source (1) of modulated coherent radiation. The cylindrical container (3) is filled with a liquid or gaseous medium transparent for the radiation flux. The length of this cylindrical container (3) is at least twice as long as that of the recording coating (12) applied on the tubular base (9) of the cylindrical information carrier (2) equipped with drives for rotation and axial motion.