Abstract: A pyroelectric detector which includes at least one pyroelectric element consisting of a pyroelectric material sandwiched between first and second electrodes, and a semiconductor chip having a field effect transistor formed on one surface thereof and having an electrical contact for the gate electrode of the transistor formed on the surface thereof, opposite to said one surface, the gate electrode contact of the chip being secured in electrical contact to the first one of the electrodes of the pyroelectric element, the size of the chip being such that a major portion of the first electrode is not covered by the chip.

Abstract: A truncated cone-shaped hollow body is provided and defined by a plurality of graduated size and axially spaced circular band portions interconnecting with a plurality of elongated circumferentially spaced slant height extending band portions with generally trapezoidal shaped openings or passages being defined between pairs of adjacent interconnecting circular and slant height band portions. The small diameter end of the body includes a generally radially inwardly projecting circumferentially extending annular portion and a cylindrical extension formed integrally with an extending outwardly of the inner marginal portion of the annular portion. The body includes a longitudinal slot extending the full length of the extension, through the annular portion and the two circular band portions adjacent the annular portion are interrupted between a pair of adjacent slant height band portions between which a radial plane of the body containing the said slot extends.

Abstract: An upwardly opening rectangular tray including front, rear and opposite side walls is provided and includes a bottom wall extending between and interconnecting the lower marginal portions of the upstanding walls. The front wall terminates upwardly in a generally horizontally forwardly projecting flange extending therealong and the forward extremity of the flange terminates in an upwardly projecting flange whose upper marginal portion is provided with upwardly opening notches spaced therealong. The front wall of the tray includes forwardly projecting upstanding ribs projecting outwardly therefrom and spaced along the front wall. The ribs project forwardly outwardly beyond the forwardly projecting and upstanding flange and the tray includes a cover movable into position overlying the upper marginal edges of the front, rear and opposite side walls.