Lens barrel

Details Lens barrel Lens barrel

2006-03-28

2006-03-28

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S234000, C359S694000, C359S885000, C359S888000, C359S030000, C348S363000, C353S097000, C396S063000, C396S457000

Reexamination Certificate

active

07019917

ABSTRACT:
A lens barrel includes an optical system including a short focal length for a wide angle of view; and an ND filter in the shape of a disc which is provided on an optical axis of the optical system. An optical density of the ND filter decreases in a direction radially outwards from a center of the ND filter.

REFERENCES:
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patent: 3981565 (1976-09-01), Karasawa
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patent: 5387958 (1995-02-01), Pashley
patent: 5555069 (1996-09-01), Albrecht et al.
patent: 5961859 (1999-10-01), Chou et al.
patent: 2002/0021511 (2002-02-01), Lee et al.
patent: 1399067 (1975-06-01), None
patent: 2326733 (1998-12-01), None
patent: 5-346605 (1993-12-01), None
patent: 9-15681 (1997-01-01), None
patent: 2000-214514 (2000-08-01), None

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