Objective lens and scanning device using such an objective lens

Details Objective lens and scanning device using such an objective lens Objective lens and scanning device using such an objective lens

1997-03-06

2000-04-18

Epps, Georgia

Optical: systems and elements

Lens

Including a nonspherical surface

359721, 359724, 369 4423, 369 4424, G02B 302, G02B 310, G11B 700

Patent

active

060522372

ABSTRACT:
A scanning device for optical record carriers is provided with an objective lens (7) suitable for scanning record carriers (1, 21) having a transparent substrate (2, 23) of different thicknesses. The lens comprises an outer annular part (25) and an inner central part (26) within the annular part. Only the central part of the lens is used for forming a focus through a first substrate (2) having a first thickness. The central part is corrected for the spherical aberration of the first substrate. The annular and central part of the lens are used for forming a focus through a second substrate (23) having a different, second thickness. The annular part is corrected for the spherical aberration of the second substrate.

REFERENCES:
patent: 4426696 (1984-01-01), Brenden et al.
patent: 5446565 (1995-08-01), Komma et al.
patent: 5703862 (1997-12-01), Lee et al.
patent: 5708638 (1998-01-01), Braat et al.
patent: 5734512 (1998-03-01), Shin et al.
patent: 5737294 (1998-04-01), Yamakawa et al.

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