Incident-light controlling apparatus

Details Incident-light controlling apparatus Incident-light controlling apparatus

2011-07-12

2011-07-12

Schwartz, Jordan M. (Department: 2873)

Optical: systems and elements

Lens

With light limiting or controlling means

C359S722000, C359S739000, C359S889000

Reexamination Certificate

active

07978422

ABSTRACT:
An incident-light controlling apparatus has a first aperture in a substrate, a diaphragm blade which rotates around an axis, and controls light passing through the first aperture, by the diaphragm blade rotating alternately between a first stationary position coinciding with the first aperture, and a second stationary position retracted from the first aperture, a permanent magnet joined directly to the diaphragm blade, at a position of the axis of rotation of the diaphragm blade, and magnetized in a direction of a plane of rotation of the diaphragm blade, and a pair of coils having a winding around cores disposed such that an end portion of each coil faces the magnet. The diaphragm blade rotated alternately between the first and second stationary positions due to an interaction between a generated magnetic field upon passing an electric power, and a magnetic field generated due to the magnet.

REFERENCES:
patent: 5117137 (1992-05-01), Kobayashi
patent: 2005/0185241 (2005-08-01), Johnson et al.
patent: 2006/0152093 (2006-07-01), Oishi et al.
patent: 2010/0044607 (2010-02-01), Miki et al.
patent: HEI 10-20360 (1998-01-01), None

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