Optical system of optical pick-up

Details Optical system of optical pick-up Optical system of optical pick-up

2004-04-22

2008-03-04

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S053190

Reexamination Certificate

active

07339876

ABSTRACT:
There is provided an optical system of an optical pick-up for recording/reproducing data to/from at least two types of optical discs including a first optical disc and a second optical disc whose recording density is higher than that of the first optical disc. The optical system is provided with a light source unit for the first and second optical discs, an objective lens, and a photo detector. The optical system further includes an optical surface to satisfy compatibility between the at least two types of optical discs, the optical surface being located between the light source unit and one of the at least two type of optical discs. The optical surface has an inner region having a numerical aperture for the first optical disc, an outer region located having a numerical aperture for the second optical disc, and an intermediate region that is located within the outer region at a periphery of the inner region. Transmissivity for a light beam having a wavelength suitable for the first optical disc in the intermediate region is lower than that in the inner region.

REFERENCES:
patent: 5665957 (1997-09-01), Lee et al.
patent: 6009066 (1999-12-01), Yoo et al.
patent: 6043912 (2000-03-01), Yoo et al.
patent: 6111842 (2000-08-01), Nishino et al.
patent: 6118594 (2000-09-01), Maruyama
patent: 6222812 (2001-04-01), Yoo et al.
patent: 6363046 (2002-03-01), Yoo et al.
patent: 7116627 (2006-10-01), Yoo et al.
patent: 2002/0172132 (2002-11-01), Takeuchi et al.
patent: 2003/0058776 (2003-03-01), Sakamoto
patent: 2003/0202450 (2003-10-01), Takasuka et al.
patent: 1264899 (2000-08-01), None
patent: 1335600 (2002-02-01), None
patent: 2000-76694 (2000-03-01), None
patent: 2000-81566 (2000-03-01), None
patent: 2000-207766 (2000-07-01), None
patent: 2002-333576 (2002-11-01), None
English language Abstract and computer-generated translation of JP 2000-207766.

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