摘要:
There is disclosed an optical card recorder-reader, in which erroneous signal recording, caused by a low-level light beam when it is stopped at a position for a prolonged period between writing and/or reading operation, either by interruping the irradiation, or by reducing the power of irradiation, or by placing the light beam outside the recording area, when the recording or reading operation is not in progress.
摘要:
An optical information recording medium in the form of a card having tracking tracks for obtaining a tracking signal and clock tracks for obtaining a clock signal arranged alternately and record zones for recording information between each of the tracking tracks and each of the clock tracks, and apparatus for recording/reproducing information using the recording medium.
摘要:
Method and apparatus for recording information on a card-shaped optical information recording medium with a light beam and/or for reproducing information recorded on the medium. The apparatus includes a device for irradiating the medium with a light beam, a device for causing relative reciprocal movement between the medium and the light beam, and a device for terminating or displacing the light beam on the medium, after the lapse of a predetermined period of time from a moment when the relative speed of the medium and the light beam is reduced below a predetermined speed. The method includes the steps carried out by the apparatus.
摘要:
In an optical information recording medium of the type wherein information is recorded or reproduced when a light beam scans each of a plurality of mutually parallel tracking tracks, an auxiliary track is extended between the adjacent tracking tracks and has at least one portion in parallel with the tracking tracks. In a method of recording or reproducing information by scanning a light beam on each of a plurality of mutually parallel tracking tracks on the recording medium, the recording medium has an auxiliary track which is extended between the adjacent tracking tracks and which has at least one portion in parallel with the tracking tracks and the light beam is kicked in the parallel portion of the auxiliary track.
摘要:
An information memory apparatus includes: an endless belt which is driven forward and in reverse by a motor and reciprocates a recording medium such as an optical card; an optical head for reading out information from the recording medium which is being moved by the endless belt; a memory for temporarily storing the information read out by the optical head; a transfer apparatus for transferring the information read out of the memory to the outside; and a control circuit for changing the positions at which the information stored in the memory is read in accordance with the reading of the information upon the forward and returning operation of the recording medium. The control circuit also changes the reading directions of the information from the memory in accordance with the forward and returning operations of the recording medium. With this apparatus, the information reading efficiency is improved and the information is efficiently transferred by a simple constitution, while reducing the number of memories.
摘要:
An optical information recording and reproducing apparatus comprises, an optical head for recording and reproducing information on and from a card-shaped optical recording medium, first means for relatively reciprocally moving said optical head to said card-shaped optical recording medium, and control means for controlling a relative speed between said optical head and said optical recording medium, said control means keeping a constant relative speed between said optical head and said optical recording medium in a record area of said optical recording medium and changing the relative speed between said optical head and said optical recording medium and reversing the direction of the relative movement between said optical head and said optical recording medium in areas outside of the record area.
摘要:
In an information recording medium according to the present invention, marks for discriminating between information tracks and a mark indicative of the information concerning spacing from a position at which each of the marks is provided to the recording starting position are provided in an information block, and a plurality of such information blocks are continuously provided in the other area of the information tracks than the recording area. The specification also discloses an information recording and reproducing method and apparatus utilizing such a plurality of information blocks.
摘要:
The information recording method of the present invention comprises steps of recording information on a recording medium by a recording head during forward movement, reading the information recorded during the forward movement in the opposite sequence to the recording sequence during backward movement, and checking if the information has been correctly written or not based on the information read during the backward movement.
摘要:
An information recording medium includes: a plurality of information tracks for storing information to be recorded; a first area for separating and discriminating an information track from another information track adjacent to the information track in the direction of information sequence; and a second area for separating and discriminating the information track from another information track adjacent to the information track in the direction perpendicular to the direction of information sequence, the second area having a common portion to the first area.
摘要:
An information recording medium comprises a plurality of record bands each having a plurality of information recording tracks arranged orthogonally to a direction of the track, and the record bands are arranged orthogonally to a direction of arrangement of the tracks. Identification fields are provided in the respective bands to allow identification of track groups.