Infrared detection device
AssigneeSociete Francaise de Detecteurs Infrarouges-Sofradir
InventorJean L. Montanari
Life of this patent
Estimating the term…
Abstract
A low temperature infrared detector for use in a cryostat having a cold finger. A cold plane is mounted upon the cold finger in heat transfer relationship therewith. A read circuit board is mounted upon the cold plane and a detector circuit board is placed over the read circuit and is connected thereto both electrically and thermally. A screen is fitted over the detector circuit board. The screen has a shoulder formed in its bottom wall into which the detection board is press-fitted and a window that frames the detecting circuitry through which the circuitry can be viewed by an IR source. Preferably, the screen is produced using electroforming techniques.
Claims5
A low temperature infrared detection device for use in association with a cryostat that is equipped with a cold finger, said detection device including
- a cold plane mounted upon the cold finger for supporting a ceramic plate having read and application circuit means mounted thereon,
- a circuit board mounted upon the ceramic plate containing detection circuit means that is connected to the read and application circuit means, said circuit board having a predetermined thickness and an outer periphery of given size and shape,
- a thin cold screen having a recess formed in the bottom surface that has a depth that is less than the thickness of the circuit board, said recess being of a size and shape that complements that of the outer periphery of said circuit board, said cold screen further including a diaphragm opening passing downwardly through its top surface into said recess, and
- said circuit board being press-fitted into the recess of said cold screen so that the diaphragm opening frames the detection circuit means and the side walls and top wall of the recess are in tight, intimate contact with the side walls and top wall of the circuit board to maximize heat flow between the circuit board and the cold screen and to minimize the mass of the screen.
Dependencies are inferred from the claim text.