Kiyonobu Endo

Optical head device with diffraction grating for separating a light beam incident on an optical recording medium from a light beam reflected therefrom

Optical device for producing a minute light beam

Recording member for laser beam and process for recording

Information recording and/or reproducing apparatus with an optical medium sensor for providing automatic variation in light beam intensity in accordance with various recording medium

Magnetooptic reproducing device

Optical recorder having focus controlling means

Apparatus for mounting and rotating an optical card for recording and/or reproducing information

Optical pickup using split beams impinging on different photodetector areas

Photo-magnetic reproducing apparatus

Method and apparatus for accessing a desired track of a recording medium during a stopped state of recording or reproduction