Objective lens, converging optical system, optical pickup...

Details Objective lens, converging optical system, optical pickup... Objective lens, converging optical system, optical pickup...

2005-08-09

2005-08-09

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S794000, C369S044230, C369S112260

Reexamination Certificate

active

06927923

ABSTRACT:
An objective lens for recording and/or reproducing information of an optical information recording medium, comprises a first lens group having a positive refractive power and a second lens group having a positive refractive power. The first lens group and the second lens group are arranged in this order from a light source side. The objective lens is a finite conjugate type to converge a divergent light flux from a light source onto an information recording plane of the optical information recording medium and satisfies the following formula:in-line-formulae description="In-line Formulae" end="lead"?NA≧0.65in-line-formulae description="In-line Formulae" end="tail"?where NA is an image-side numerical aperture necessary for conducting recording and/or reproducing information of the optical information recording medium.

REFERENCES:
patent: 5161040 (1992-11-01), Yokoyama et al.
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patent: 6058095 (2000-05-01), Yamamoto et al.
patent: 6097688 (2000-08-01), Ichimura et al.
patent: 2001/0008513 (2001-07-01), Arai et al.
patent: 2001/0019528 (2001-09-01), Shiono et al.
patent: 2003/0021216 (2003-01-01), Hendriks et al.

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