Two dimensional array infrared ray image pickup device
First Claim
1. An infrared ray image pickup device having a two-dimensional array structure comprises:
- a substrate;
a plurality of scanning circuits provided as two-dimensional arrays on a surface of said substrate;
a layer having a plurality of cavities provided over said scanning circuits;
a plurality of beams extending across said cavities, each of said beams comprising;
a first plate-like beam portion made of a first insulation material, said first plate-like beam portion having a first width, and including an expanding portion having a second width larger than said first width;
a thermoelectric transducer provided on said first plate-like beam portion, said thermoelectric transducer extending along a longitudinal center axis of said first plate-like beam portion, and having a third width smaller than said first width;
a second plate-like beam portion having said first width and being provided to cover said thermoelectric transducer so that said thermoelectric transducer is completely sealed by said first and second plate-like beam portions, said second plate-like beam portion being made of a second insulation material having an inexpansive residual stress different from an expansive residual stress of said first insulation material of said first plate-like beam portion so that each of said beams is gradually arched to raise up its center portion, and said second plate-like beam portion including an expanding portion having the second width larger than said first width, said expanding portion of said second plate-like beam portion being positioned to correspond to said expanding portion of said first plate-like beam portion; and
an infrared-ray absorption layer provided entirely on said expanding portion of said second plate-like beam portion;
a lens-substrate provided on a plurality of spacers provided on a peripheral area of said layer so that said lens-substrate is spaced apart from said layer, said lens-substrate having a plurality of micro-lenses whose centers are positioned directly over said expanding portions of said beams so that each of said micro-lenses faces said infrared-ray absorption layer, said spacers having a height equal to a sum of a difference in level between a top and bottom of said arched beams, a difference in level between the center and the edge of said micro-lenses and a focal distance of said micro-lenses thereby causing said micro-lenses to be spaced apart from the tops of said arched beams by said focal distance of said micro-lenses.
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Accused Products
Abstract
An infrared ray image pickup device has a two-dimensional array structure having a sensor substrate, a plurality of scanning circuits provided to form two dimensional arrays on a surface of the substrate, a layer having a plurality of cavities provided over the scanning circuits, a plurality of beams provided to extend over the cavities, each of the beams including an element for converting a temperature variation to an electric signal, a supporting element provided on a peripheral region of the substrate for supporting a lens substrate including a plurality of micro-lenses that are located to face the beams so that a convex portion of each of the micro-lenses is spaced from a top of each of the beams by the same distance as a focal distance of the micro-lenses. The supporting element may have a plurality of convex portions made of boron phosphate silicate glass or boron silicate glass. Alternatively, the supporting element may include a plurality of bearings provided on a packaging substrate and bonding agents surrounding the bearings, the packaging substrate being provided thereon with the sensor substrate.
23 Citations
4 Claims
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1. An infrared ray image pickup device having a two-dimensional array structure comprises:
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a substrate; a plurality of scanning circuits provided as two-dimensional arrays on a surface of said substrate; a layer having a plurality of cavities provided over said scanning circuits; a plurality of beams extending across said cavities, each of said beams comprising; a first plate-like beam portion made of a first insulation material, said first plate-like beam portion having a first width, and including an expanding portion having a second width larger than said first width; a thermoelectric transducer provided on said first plate-like beam portion, said thermoelectric transducer extending along a longitudinal center axis of said first plate-like beam portion, and having a third width smaller than said first width; a second plate-like beam portion having said first width and being provided to cover said thermoelectric transducer so that said thermoelectric transducer is completely sealed by said first and second plate-like beam portions, said second plate-like beam portion being made of a second insulation material having an inexpansive residual stress different from an expansive residual stress of said first insulation material of said first plate-like beam portion so that each of said beams is gradually arched to raise up its center portion, and said second plate-like beam portion including an expanding portion having the second width larger than said first width, said expanding portion of said second plate-like beam portion being positioned to correspond to said expanding portion of said first plate-like beam portion; and an infrared-ray absorption layer provided entirely on said expanding portion of said second plate-like beam portion; a lens-substrate provided on a plurality of spacers provided on a peripheral area of said layer so that said lens-substrate is spaced apart from said layer, said lens-substrate having a plurality of micro-lenses whose centers are positioned directly over said expanding portions of said beams so that each of said micro-lenses faces said infrared-ray absorption layer, said spacers having a height equal to a sum of a difference in level between a top and bottom of said arched beams, a difference in level between the center and the edge of said micro-lenses and a focal distance of said micro-lenses thereby causing said micro-lenses to be spaced apart from the tops of said arched beams by said focal distance of said micro-lenses. - View Dependent Claims (2, 3, 4)
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Specification