Nec Home Electronics, Inc.

Shuichi Onayama

Kazuhiko Nosaka

An optical pickup for picking up signals from an optical disk comprises a hologram to split a laser beam emitted from a laser light source into one 0th diffraction light beam and two 1st diffraction light beams, and also to diffract return light beams reflected from the optical disk with two grating areas formed on one surface thereof. The diffracted light beams from the hologram are detected by a 6-piece-divided photodetector. The number of parts included in the system has been greatly reduced.

Optical pickup and hologram therefor

An optical pickup for picking up signals from an optical disk comprises a hologram to split a laser beam emitted from a laser light source into one 0th order diffraction light beam and two 1st order diffraction light beams, and also to diffract return light beams reflected from the optical disk with two grating areas formed on one surface thereof. The diffracted light beams from the hologram are detected by a 6-piece-divided photodetector. The number of parts included in the system has been greatly reduced.

Growing community of inventors

Osaka, Japan

Shuichi Onayama