Disk recording apparatus for re-establishing a recording mode at a desired address

Claim 1

In a disk recording apparatus for recording information by projecting a laser beam having an adjustable power level on a predetermined one of a plurality of tracks in an optically recordable disk on which absolute addresses have been recorded in advance, said disk recording apparatus being operative to read said absolute addresses indicative of a position of said laser beam on said optically recordable disk; a system for re-establishing a recording mode at a desired recording position in said predetermined one of said plurality of tracks of said laser beam after the occurrence of an undesired track jump of said laser beam, comprising: detecting means for detecting an undesired track jump of said laser beam from said predetermined one of said plurality of tracks to another track during a recording operation; address counting means for maintaining a current address in said predetermined one of said plurality of tracks after the occurrence of said undesired track jump by counting clock signals synchronized with the absolute addresses read by said disk recording apparatus indicating a current address of said laser beam; first power adjusting means for adjusting the power level of said laser beam to a non-recording level upon the detection of said undesired track jump by said detecting means; repositioning means for repositioning said laser beam to a different track of said optically recordable disk after said undesired track jump; comparing means for comparing the absolute addresses read by the disk recording apparatus from said different track of said optically recordable disk with said current address maintained by said address counting means to detect coincidence thereof; and second power adjusting means for increasing the adjustable power level of the laser beam to a recording level after detection of coincidence of one of said absolute addresses and said current address by said comparing means.