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Featured researches published by Masaaki Sunohara.


Applied Optics | 1994

Molded-glass optical element for focusing servos

Yasuhiro Tanaka; Masaaki Sunohara; Jun Murata; Tohru Nakamura; Hideki Aikoh

A double-knife-edge method for focusing error detection has been integrated into one molded-glass optical element (MGOE). The first surface of the MGOE consists of two parts, a slant plane and a sphere; the second surface is an asphere; Groove cross noise caused by a geometrical aberration of the MGOE is simulated. When the second surface is at sphere, there is a focus offset of 3 µm for a photodetector shift of ±10 µm, whereas the aspherical surface causes no focus offset. There was less than 0.3µm groove cross noise in the MGOE in the experiment.


Archive | 1991

Die for press-molding optical element

Makoto Umetani; Hideto Monji; Masaaki Sunohara; Jun Murata; Toshiaki Takano; Yoshinori Shirafuzi; Yoshio Inoue; Kiyoshi Kuribayashi


Archive | 1989

Mold for molding optical elements

Takayuki Kimoto; Masaaki Sunohara; Takashi Inoue; Shoji Nakamura; Daijirou Yonetani


Archive | 1989

Method of press molding lens material

Jun Murata; Masaaki Sunohara; Takayuki Kimoto


Archive | 1990

Method of producing optical glass element and production apparatus using this method

Hideto Monji; Kiyoshi Kuribayashi; Masaaki Sunohara; Tadayoshi Yonemoto; Noriyuki Kawata; Tadao Shioyama; Makoto Umetani


Archive | 1984

Optical disc and method of manufacturing

Tooru Tamura; Kensuke Kuchiba; Akio Itoh; Masaaki Sunohara; Shunsuke Matsuda


Archive | 1987

Method of molding plastic and injection compression molding apparatus using elongatable tie bars

Toru Tamura; Masaaki Sunohara; Akio Ito; Yoshio Nakatani


Archive | 1992

Method of producing glass blank

Yoshiyuki Shimizu; Shoji Nakamura; Tadayoshi Yonemoto; Masaaki Sunohara; Tadao Shioyama; Noriyuki Kawata


Archive | 1991

MACHINE FOR MOLDING OPTICAL ELEMENT

Shoji Nakamura; Takasi Inoue; Masaaki Sunohara; Tadao Shioyama


Archive | 1989

Objective lens for optical disk system and optical head using the same

Yasuhiro Tanaka; Masaaki Sunohara; Yasuo Nakajima; Shinichi Tanaka

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