Optical low pass filter
First Claim
1. An imaging device comprising:
- an objective lens;
a solid state image sensor having formed thereon a plurality of picture elements having a periodicity;
a diffraction grating disposed between the objective lens and the solid state image sensor, said diffraction grating projecting an image having a periodicity onto the solid state image sensor by the objective lens, wherein the periodicity of the projected image of the diffraction grating is selected to be twice or 1/n of the periodicity of the picture elements, wherein n represents an integer.
2 Assignments
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Accused Products
Abstract
An optical low pass filter for use in an imaging device including an objective lens and a solid state image sensor forming a plurality of picture elements thereon, which filter comprises a diffraction grating disposed between the objective lens and the solid state image sensor. The diffraction grating is of a type which the periodicity of an image of the diffraction grating projected onto the solid state image sensor by the objective lens is selected to be twice or 1/n of the periodicity of the picture element, wherein n represents an integer. The applicable imaging device may be of a type comprising an objective lens, a solid state image sensor forming a plurality of picture elements thereon, and a color filter array disposed on the solid state image snesor and including a plurality of sets of different color filter elements, or of a type comprising a single tube type color imaging device having an evacuated glass envelope, an objective lens and a color filter array including a plurality of sets of different color filter elements.
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Citations
8 Claims
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1. An imaging device comprising:
- an objective lens;
a solid state image sensor having formed thereon a plurality of picture elements having a periodicity; a diffraction grating disposed between the objective lens and the solid state image sensor, said diffraction grating projecting an image having a periodicity onto the solid state image sensor by the objective lens, wherein the periodicity of the projected image of the diffraction grating is selected to be twice or 1/n of the periodicity of the picture elements, wherein n represents an integer. - View Dependent Claims (2)
- an objective lens;
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3. An imaging device comprising:
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an objective lens; a solid state image sensor having formed thereon a plurality of picture elements; a color filter array disposed so as to cover the picture elements of the image sensor and including a plurality of sets of different color filter elements having a periodicity; a diffraction grating disposed between the objective lens and the solid state image sensor by the objective lens, said diffraction grating projecting an image having a periodicity onto the solid state image sensor by the objective lens, wherein the periodicity of the projected image of the diffraction grating is selected to be twice or 1/n of the periodicity of each set of the different color filter elements of the color filter array, wherein n represents an integer. - View Dependent Claims (4, 5)
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6. A single tube color imaging device comprising:
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an objective lens; an image sensing tube including an evacuated glass envelope and having an image plane where an image of a scene is focused; a color filter array housed within the glass envelope including a plurality of sets of different color filter elements having a periodicity; a diffraction grating disposed between the objective lens and the solid state image sensor, said diffraction grating projecting an image having a periodicity onto the solid state image sensor by the objective lens, wherein the periodicity of the projected image of the diffraction grating is selected to be twice or 1/n of the periodicity of each set of the different color filter elements of the color filter array, wherein n represents an integer. - View Dependent Claims (7, 8)
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Specification