Patent ID: 9239443
Filing Date: 2016-01-19
CPC Classification: G02B

Claim Text:
1. A variable bandpass filter system comprising: a plurality of substantially rectangular bandpass filters defining long and short edges, said filters being generally coplanar and mounted to form a linear array defining a longitudinal axis and a lateral direction, wherein the long edges of said filters are parallel to said longitudinal axis and the short edges of said filters are parallel to said lateral direction, wherein the bandpass range of at least one of said filters varies as a function of the angle of incident light, and wherein the long edges of each said filter is about 50 mm and the short edges of each said filter is about 25 mm, a linear stepper motor coupled to said linear filter array to transport said array along said longitudinal axis, a cam follower positioned proximate to a long edge of each said filter, and a passive stationary cam positioned adjacent to said filter array to engage said cam followers such that said filters passively and automatically tilt up and down at an angle between 0 degrees and 60 degrees as the filters move relative to said cam as a result of said array being transported along said longitudinal axis.