Patent ID: 7929403

Claim:
An apparatus for recording information in an optical storage medium, comprising: a medium support part configured to support the optical storage medium; a laser light source configured to produce a pulsed laser beam; a beam splitter configured to split the pulsed laser beam generated by the laser light source into first and second pulsed laser beams; a beam-condensing optical system configured to concentrate the first pulsed laser beam in the optical storage medium supported by the medium support part; a shutter configured to interrupt and resume emission of the first pulsed laser beam; a photosensor configured to receive the second pulsed laser beam to produce a detection signal; and a controller which comprises: a sync-generator configured to receive the detection signal from the photosensor and to generate a synchronizing signal based upon the received detection signal; and a shutter driver configured to drive the shutter in synchronization with timing represented by the synchronizing signal generated by the sync-generator.