Dual focusing optical pickup device

Details Dual focusing optical pickup device Dual focusing optical pickup device

1996-12-23

1998-03-24

Font, Frank G.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359630, 359625, 359636, G02B 2714

Patent

active

057319014

ABSTRACT:
In a dual focusing optical pickup device, a laser beam is incident on an optical member via a beam splitter. Some part of the incident laser beam is reflected by the optical member and then returned to the beam splitter to be focused on an optical disc. The other part of the incident beam is refracted and transmitted through the optical member and then totally reflected by the reflecting member to return to the optical member. The returned beam is focused to the optical disc via the optical member and the beam splitter. The beam which is reflected by the optical member and the beam which is reflected by the reflecting member after being transmitted through the optical member generate a dual focus on the optical disc, in which the dual focus has different focal distances. Therefore, the optical discs of two kinds in which the recording layers are placed at different distances can precisely be recorded or reproduced, respectively.

REFERENCES:
patent: 2183249 (1939-12-01), Shering et al.
patent: 4805992 (1989-02-01), Maeda
patent: 4892371 (1990-01-01), Yamada et al.
patent: 5251198 (1993-10-01), Strickler

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