Blur film assembly for infrared optical applications
First Claim
1. A blur film assembly, comprising:
- a blur film made of a film material transmissive to a selected waveband of incident infrared energy, the blur film having a surface texture thereon comprising a pattern of peak-and-valley features having an amplitude in the direction perpendicular to the surface of the blur film and a lateral dimension parallel to the surface of the blur film that are each no less than a midpoint wavelength of the selected waveband of incident infrared energy.
2 Assignments
0 Petitions
Accused Products
Abstract
A blur film is made of a polymeric film material transmissive to infrared energy of a selected waveband, which is affixed to a surface of a substrate transmissive to energy of the same selected infrared waveband. The blur film has a texture or a plurality of lenslets thereon, where the surface of each lenslet is a surface of revolution. In a spatial-filter wheel application, the blur film and substrate are affixed to a support, which in turn is rotatably mounted on a drive. The support is structured such that a portion of its circumference is covered by the blur film and a portion of its circumference is not covered by the blur film. The spatial-filter wheel is rotated in front of a detector to produce alternating blurred and direct images on the detector.
-
Citations
14 Claims
-
1. A blur film assembly, comprising:
a blur film made of a film material transmissive to a selected waveband of incident infrared energy, the blur film having a surface texture thereon comprising a pattern of peak-and-valley features having an amplitude in the direction perpendicular to the surface of the blur film and a lateral dimension parallel to the surface of the blur film that are each no less than a midpoint wavelength of the selected waveband of incident infrared energy. - View Dependent Claims (2, 3, 4)
-
5. A blur film assembly, comprising
a blur film made of a film material transmissive to a selected waveband of infrared energy, a surface of the blur film comprising a plurality of lenslets, wherein each lenslet comprises a surface shaped as a surface of revolution.
-
10. A blur film assembly, comprising:
-
a blur film made of a film material transmissive to energy of a selected infrared waveband, the film having a plurality of lenslets thereon, each lenslet comprising a locally curved surface of revolution; a support to which the blur film is affixed to form a spatial-filter wheel, the spatial-filter wheel having a circumferentially extending first sector covered by the blur film and a circumferentially extending second portion not covered by the blur film; and a rotational drive affixed to the spatial-filter wheel. - View Dependent Claims (11, 12, 13, 14)
-
Specification