Patent ID: 6704253
Filing Date: 2004-03-09
Classification: G11B

Abstract:
A disc recording and playback apparatus for recording a recording signal to a disc by moving a pickup in a radial direction on a rotating disc and tracing a track on said disc so as to record the recording signal onto said disc, and to change a signal recording linear velocity with respect to the disc when a signal recording position reaches a speed change position in a radial direction on the disc, said disc recording and playback apparatus comprising:a signal control circuit for interrupting the recording of the recording signal at an interrupted position when said recording position reaches said speed change position and for resuming the recording of the recording signal from the interrupted position; a pickup control circuit for retracting said pickup a predetermined amount in a direction of already recorded signals on the disc and for resuming the tracing of the track on the disc from that position; and a rotational control circuit for changing the disc rotational speed to attain the recording linear velocity after the change, concurrently with the retraction of said pickup, when said recording position by a recording position detector reaches a predetermined position; said predetermined amount for retracting said pickup by said pickup control circuit is set according to a time required for changing the rotational speed after the rotational speed of said disc is changed.