Optical: systems and elements – Lens – With light limiting or controlling means
Patent
1996-05-01
1998-10-13
Font, Frank G.
Optical: systems and elements
Lens
With light limiting or controlling means
G02B 900
Patent
active
058221352
ABSTRACT:
A lens device which can be used as an objective lens in an optical pickup apparatus includes an objective lens provided along a light path facing a disc and having a predetermined effective diameter, and light controlling means provided along the light path for controlling the light in an intermediate region between near and far axes of an incident light beam, thus providing a simplified and inexpensive device for using discs of differing thickness in a single disc drive, by reducing the spherical aberration effect.
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Cho Kun-ho
Chung Chong-sam
Lee Chul-woo
Lee Yong-hoon
Rim Kyung-hwa
Font Frank G.
Samsung Electronics Co,. Ltd.
Stafira Michael P.
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