Objective lens and optical pick-up apparatus

Details Objective lens and optical pick-up apparatus Objective lens and optical pick-up apparatus

2007-03-06

2007-03-06

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

C359S719000

Reexamination Certificate

active

10769848

ABSTRACT:
An objective lens has a first meniscus-shape lens including a first object-side surface having a positive reflective power; and a second meniscus-shape lens having a positive reflective power. The first meniscus-shape lens and the second meniscus-shape are arranged in that order from an object side. The objective lens satisfies the following formulas:in-line-formulae description="In-line Formulae" end="lead"?fF/f≦−1.1in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?LH1H2/f≧0.5in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?fB/f≧0.2in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?L/f≦1.3in-line-formulae description="In-line Formulae" end="tail"?where f is an object-side focus length of the objective lens, fF is a front focus, fB is a back focus, LH1H2is a length between an object-side principal point H1and an image-side principal point H2,and L is a length on an optical axis of the objective lens between the first object-side surface and the second image-side surface.

REFERENCES:
patent: 4447138 (1984-05-01), Sugiyama et al.
patent: 5467225 (1995-11-01), Manabe
patent: 5475536 (1995-12-01), Kikutani
patent: 6577456 (2003-06-01), Sato

Affiliated with

Also associated with

Rating

Objective lens and optical pick-up apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Objective lens and optical pick-up apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Objective lens and optical pick-up apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3800908