慎一 門脇

TL;DR: In this article, the authors proposed an optical head consisting of a semiconductor laser for emitting a light beam, an objective lens for concentrating the light beam on an optical disk, a transfer means for transferring the objective lens 202 between the outermost circumference and the innermost circumference of a recording area of the optical disk 205 along with a photodetector 214 for detecting the light be returned from the optical disks 205.

TL;DR: In this article, the authors proposed a method to reduce the degradation in the quality of recording and reproducing signals caused by the tilt between optical beams and an optical information recording medium.

TL;DR: In this article, the authors proposed an optical information processor consisting of an optical head which irradiates the optical information recording medium with light, converts the reflected light reflected by the light into a head signal, and outputs it, and a signal quality index detector which detects the quality of the head signal according to the head signals outputted from the optical head.

TL;DR: In this article, the authors proposed a solution to improve the compatibility, reliability, and accessibility of a single layer disk and a multilayer disk, where the first layer which is the recording layer L0 has the same distance from the cover layer surface CVLs to be irradiated with the laser beam in the thickness direction.

TL;DR: In this paper, a spherical aberration detection signal is obtained for a high-density optical disk by splitting the returned light from an optical disk into two of transmitted light and diffracted light by a hologram element 108.