Light amount adjusting device, and optical device using the...

Details Light amount adjusting device, and optical device using the... Light amount adjusting device, and optical device using the...

2006-05-09

2006-05-09

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Absorption filter

Neutral or graded density

C359S885000

Reexamination Certificate

active

07042662

ABSTRACT:
To provide an ND filter and a light amount adjusting device, in which a deterioration of optical performance of an optical system is small, and in addition, an optical system having the light amount adjusting device, and an optical device having the optical system. More specifically, an ND filter according to the present invention includes: a base that transmits light having a predetermined wavelength λ; and a filter member selectively formed on the base, in which: a transmittance of the filter member gradually changes in a region in a predetermined direction; and a phase difference which is produced between light transmitting through the filter member and light transmitting through a region on the base in which the filter member is not formed is λ/5 or less in a boundary of the filter member.

REFERENCES:
patent: 3943019 (1976-03-01), Krekeler et al.
patent: 6078442 (2000-06-01), Tada et al.
patent: 2002/0176183 (2002-11-01), Erz et al.
patent: 2003/0011910 (2003-01-01), Weiss
patent: 2003/0086014 (2003-05-01), Murata et al.
patent: 2027925 (1980-02-01), None
patent: 52-117127 (1977-10-01), None
patent: 05-281593 (1993-10-01), None
patent: 06-265971 (1994-09-01), None
patent: 2000-106649 (2000-04-01), None

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