Optical pickup apparatus and identification apparatus for identi

Details Optical pickup apparatus and identification apparatus for identi Optical pickup apparatus and identification apparatus for identi

1998-03-26

1999-06-08

Young, W. R.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4424, 369 4427, 369118, G11B 700

Patent

active

059109378

ABSTRACT:
An optical pickup apparatus for an information reproducing apparatus is adapted to reproduce one of at least first and second type optical record media which is loaded on the information reproducing apparatus. The first and second type optical record media have distances from surfaces to information record planes different from each other. The optical pickup apparatus is provided with: a light emission device for emitting a reading light; an objective lens for focusing the emitted reading light onto the information record plane of the loaded one of the first and second type optical record media such that a focus condition of the focused reading light is optimum with respect to the first type optical record medium; a correction device for correcting a spherical aberration of the focused reading light with respect to the second type optical record medium due to a difference in the distances from the surfaces to the information record planes between the first and second type optical record media when the second type optical record medium is loaded; and a light receiving device for receiving a reflection light of the focused reading light from the information record plane of the loaded one of the first and second optical record media.

REFERENCES:
patent: 5042020 (1991-08-01), Endo
patent: 5541900 (1996-07-01), Ito et al.
patent: 5729510 (1998-03-01), Kasahara et al.
Patent Abstracts of Japan, vol. 12, No. 140, (P-696), Apr. 28, 1988, & JP 62-262,019.

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