Optical pickup and objective lens used therein

Details Optical pickup and objective lens used therein Optical pickup and objective lens used therein

2007-06-13

2009-06-16

Spector, David N (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C369S112010, C369S112230

Reexamination Certificate

active

07548383

ABSTRACT:
An optical pickup1includes a collimator lens13for changing the shape of a laser light by moving on the optical axis AX from a base point. An objective lens15is set so as to form a spot of which size, when the collimator lens13is located at the base point, is minimum at a point apart from the light source side surface of an information recording medium20by a distance of Lcdefined by an expression (1):in-line-formulae description="In-line Formulae" end="lead"?Lc=(L0+Ln)/2  (1),in-line-formulae description="In-line Formulae" end="tail"?wherein Lcis named as a thickness to the designed center;L0is a distance between the light source side surface of the information recoding medium and an information recording face located nearest to the light source side surface; andLnis a distance between the light source side surface of the information recording medium and an information recording face located farthest from the light source side surface.

REFERENCES:
patent: 6556533 (2003-04-01), Fukakusa et al.
patent: 6927923 (2005-08-01), Kimura
patent: 7110344 (2006-09-01), Kimura
patent: 7283450 (2007-10-01), Komma et al.
patent: 2006/0002278 (2006-01-01), Kitazawa
patent: 2007/0165510 (2007-07-01), Yamamoto
patent: 2008/0049587 (2008-02-01), Hayashi et al.
patent: 2008/0267044 (2008-10-01), Hayashi
patent: 2009/0010113 (2009-01-01), Kamioka
patent: 2009/0010141 (2009-01-01), Nagai
patent: 2009/0010142 (2009-01-01), Komma
patent: 2006-031901 (2006-02-01), None

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