Optical pickup device, optical information recording and...

Details Optical pickup device, optical information recording and... Optical pickup device, optical information recording and...

2007-08-07

2007-08-07

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S717000, C369S112010

Reexamination Certificate

active

10821940

ABSTRACT:
An optical pickup device comprises a light source to emit a light flux having wavelength λ; an objective lens including at least two plastic lenses of a first plastic lens having positive refractive power and a second plastic lens having positive refractive power, wherein the first plastic lens and the second plastic lens are arranged in this order from the light source side; and an actuator to drive the objective lens; wherein the objective lens satisfies the following expression (1-1):in-line-formulae description="In-line Formulae" end="lead"?−0.0004<Δ3SA/(NA4·f·(1−m))<0.0004  (1-1)in-line-formulae description="In-line Formulae" end="tail"?where Δ3SA (λRMS) represents a rate of change of a third order spherical aberration of the objective lens when the temperature of an entire body of the objective lens uniformly changes, f (mm) represents the focal length of the objective lens for the light flux having wavelength λ, and m represents the magnification of the objective lens.

REFERENCES:
patent: 2002/0167739 (2002-11-01), Ota et al.
patent: 2003/0002175 (2003-01-01), Kojima
patent: 1 067 530 (2001-01-01), None
patent: 2001-194581 (2001-07-01), None
patent: 2002-236252 (2002-08-01), None
patent: 2003-006908 (2003-01-01), None
Search and examination report from Intellectual Property Office of Singapore.
Search Report from the Austrian Patent Office.

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