Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1996-04-30
1998-06-09
Nelms, David C.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4414, 369 43, 369 4423, 359664, G11B 709
Patent
active
057646139
ABSTRACT:
An optical pickup apparatus is constructed of an objective lens for condensing a light beam emitted from a light source toward an optical recording medium, and a convex lens arranged between the optical recording medium and the objective lens in which a surface thereof upon which the luminous flux projected from the objective lens is incident is a convex spherical surface with a radius of curvature which is a predetermined value, and another surface thereof which is located near and opposite to a surface portion of the optical recording medium which is a plane. With this arrangement, a tolerance with respect to decentering of the convex lens in connection with the optical axis of the objective lens is increased, so that an occurrence of aberration is reduced.
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patent: 5004307 (1991-04-01), Kino et al.
patent: 5121256 (1992-06-01), Corle et al.
patent: 5125750 (1992-06-01), Corle et al.
patent: 5497359 (1996-03-01), Mamin et al.
patent: 5553052 (1996-09-01), Oono et al.
Ichimura Isao
Maeda Fumisada
Ohsato Kiyoshi
Watanabe Toshio
Yamamoto Kenji
Chu Kim-Kwok
Kananen Ronald P.
Nelms David C.
Sony Corporation
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