Diffractive optical element, objective optical system,...

Diffractive part

Diffractive stack pickup head for optical disk drives and...

Diffractive stack pickup head for optical disk drives and...

Digital information recording by burning conductive spots with e

Digital noise blanking circuit of CD-ROM system

Digital optical tape read system

Digital phase locked loop with a digital voltage controlled osci

Digital signal encoding method and apparatus and recording mediu

Digital signal information reproduction apparatus

Digital signal reproducing apparatus using a Viterbi decoder

Digital storage

Digital video disc pick-up head system

Direct access storage unit using tunneling current techniques

Direct read after write optical disk system

Direct read during mark formation for laser power correction

Directory hologram forming an anchor location of a pattern...

Disc drive apparatus that positions an objective lens within a d

Disc drive device having a head carriage

Disc playback method