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Dive into the research topics where Koichi Maruyama is active.

Publication


Featured researches published by Koichi Maruyama.


International Conferences on Optical Fabrication and Testing and Applications of Optical Holography | 1995

Hybrid achromatic objective lens for optical data storage

Koichi Maruyama; Makoto Iwaki; Syunitirou Wakamiya; Ryota Ogawa

The two types of diffractive optical elements capable of compensating chromatic aberration in MO data storage optics have been developed. One is a diffractive element that has little optical power, and is used in cooperation with an aspherical objective lens separated from each other. The other is an aspherical singlet with a diffractive grating on its surface. Both have a diffraction efficiency of 100% for the first order diffraction.


Archive | 1997

Chromatic aberration correcting element and its application

Koichi Maruyama; Masahiro Oono; Satoru Tachihara; Masato Noguchi; Tsuyoshi Ishikawa


Archive | 2001

Objective lens for optical head

Shuichi Takeuchi; Koichi Maruyama


Archive | 1993

Image stabilizing apparatus

Koichi Maruyama


Archive | 1995

Optical system of optical information recording/reproducing apparatus

Koichi Maruyama; Makoto Iwaki


Archive | 2001

Beam shaping optical system

Koichi Maruyama; Junji Kamikubo


Archive | 1991

Magneto-optic recording/reproduction apparatus for minimizing variation in focusing error signals caused by variation in optical source wavelength

Tsuyoshi Itoh; Isao Okuda; Toshiyuki Kase; Hiroshi Nishikawa; Ryoto Ogawa; Masahiro Oono; Koichi Maruyama; Makoto Iki; Isao Takahashi


Archive | 1996

Multibeam recording device

Tetsuya Nakamura; Koichi Maruyama; Takashi Iizuka


Archive | 1989

Zoom lens capable of image blur compensation

Koichi Maruyama


Archive | 1996

Diffractive multi-focal objective lens

Koichi Maruyama; Junji Kamikubo

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