Konica Corporation

Konica-Minolta Holdings, Inc.

Takashi Matsumaru

Yuichi Atarashi

Shinichiro Saito

Norikazu Arai

Kazuo Ishida

Hiroyuki Hattori

Shogo Yamamoto

Etsuzo Kurihara

Taichiro Saito

Hiroyuki Yamazaki

An objective lens for use in an optical pickup apparatus for conducting recording and/or reproducing information for an optical information recording medium, has a lens section shaped in an approximate circle and including a flange section; and a projecting section integrally provided to the lens section. The objective lens satisfies the following conditional formulas:0.5&#x2266;A&#x2266;2.0, 0.3A&#x2266;B&#x2266;1.7A where A is a diameter (mm) of the lens section when the lens section is viewed from an direction of an optical axis, and B is a width (mm) of the projecting section when the connecting section is viewed from the direction of the optical axis.

Optical pickup lens, molded optical component, handling method, and mold for optical component

An objective lens for use in an optical pickup apparatus for conducting recording and/or reproducing information for an optical information recording medium, has a lens section shaped in an approximate circle and including a flange section; and a connecting section integrally provided to the lens section. The objective lens satisfies the following conditional formulas:0.5&#x2266;&#x2266;2.0, 0.3&#x2266;1.7

Molded optical component, handling method, and assembling method

A device for recording and reproducing on an optical information recording medium, includes a light source composed of a semiconductor laser to emit a divergent luminous flux; an objective lens to receive the divergent luminous flux and to converge the divergent luminous flux onto the optical information recording medium; and a tracker for tracking a converged luminous flux on the optical information recording medium by moving the objective lens in a direction perpendicular to an optical axis. The objective lens has an astigmatism so that a quantity of the astigmatism of a wavefront emitted from the objective lens shows a minimum value at a position where the objective lens is moved in the direction perpendicular to the optical axis by a tracking operation of the tracker.

Device for recording or reproducing information on an optical recording

Growing community of inventors

Hachioji, Japan

Takashi Matsumaru