DISK RECORDING AND REPRODUCING APPARATUS USING TWO LASER BEAMS

• Main Authors: HIGASHIHARA, TERUAKI, TOBITA, SATORU, HISHIDA, KAZUYUKI, TEZUKA, MASARU
• Format: Patent
• Language: English
• Published: 15.01.1992
• Edition: 5
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

A disk recording and reproducing apparatus using two light beams is comprised of a disk driving section for loading thereon a disk-shaped record medium having recording tracks in and from which an information is recorded and reproduced and for rotating said disk-shaped record medium, an optical system arrangement section comprised of a light beam generating source, a light beam splitting device for splitting a light beam from the light beam generating source to provide at least a main beam and a sub beam, an optical path forming device for respectively causing the main beam and the sub beam to become incident on two preceding and succeeding recording tracks in the disk-shaped record medium loaded on the disk driving section and a photo-detecting device for detecting the condition that at least the sub beam from the disk-shaped record medium loaded on the disk driving section is affected by the recording track, a disk rotation control section for controlling the disk driving section such that a relative moving speed of the recording track on the disk-shaped record medium rotated by the disk driving section relative to the main beam incident on the recording track becomes constant, a recording operation section supplied with an information to be recorded and causing the information to be recorded on the recording track on which the main beam becomes incident, and a reproducing operation section for generating a read-out information signal based on a detected output of the sub beam from the photo-detecting device, writing a resultant read-out information signal in a memory at a writing rate corresponding to the read-out information signal and reading the read-out information signal written in the memory at a predetermined reading rate to generate a reproduced information output.