198123 ⎘
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation , reproducing using an optical beam at lower power ; Record carriers therefor; Heads, e.g. forming of the optical beam spot or modulation of the optical beam; Means for guiding the beam from the source to the record carrier or from the record carrier to the detector Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
Optical pickup device, optical disk drive, optical device and composite optical element
#302Optical disk with plural signal mark positions in a direction substantially perpendicular to tracks
#303Optical lens and method of producing the same, method of producing optical lens array, focus error signal production method, and optical pickup apparatus
#304Optical miniaturized module, optical pickup device, and optical disk device provided with light source and photodetector
#305Optical pickup
#306Optical system for detecting data signal and tracking error signal
#307Optical pickup device
#308Optical pick-up device for recording/reading information on optical recording medium
#309Method and device for detecting optical data and reading-writing apparatus for optical data
#310Optical pickup device and optical disk device and optical device and composite optical element
#311Tilt sensor and optical disk drive
#312Optical head, LD module, optical recording-and-reproducing apparatus and diffraction element used in the optical recording-and-reproducing apparatus
#313Optical device for scanning an optical record carrier
#314Optical head and optical recording and reproducing apparatus
#315Optical pickup apparatus, optical data recording/reproducing apparatus, and optical data recording/reproducing method
#316Optical pickup and optical recording and/or reproducing apparatus adopting the same
#317Optical disc apparatus and spherical aberration correction controlling apparatus
#318Optical pickup device
#319Optical head apparatus
#320Optical head apparatus
#321Optical lens and method of producing the same, method of producing optical lens array, focus error signal production method, and optical pickup apparatus
#322Enhanced data storage and retrieval devices and systems and methods for utilizing the same
#323Optical near-field generating element and optical apparatus including the same
#324Holographic information recording apparatus
#325Optical scanner with micro-optics for beam combination
#326Optical pickup device and method for controlling the same
#327Optical pickup apparatus for detecting a focus-error signal using a spot size detection method
#328Optical scanning device