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Abstract

A double eye type crime preventing sensor system comprising a pair of detection axes (6) substantially horizontally spaced apart and extending in substantially the same direction in a predetermined space, another pair of detection axes (7) substantially horizontally spaced apart and extending above or below the first pair of detection axes in the corresponding direction, a radiant energy focusing element (4) disposed at the terminal ends of these two pairs of detection axes for focusing radiant energy which comes in along the respective axes, two pairs of radiant energy sensing elements (8) and (9) disposed in the image forming position corresponding to the two pairs of detection axes in the vicinity of the focal point of the focusing element, the two elements (8a), (8b) or (9a), (9b), which constitute each pair of sensing elements (8) and (9) being connected in such a manner as to produce a substantially resultant sensing output when they detect energy in a time differential fashion, and a signal processing circuit for producing a warning when two resultant sensing outputs from the pairs of sensing elements coincide with each other in the element arranging direction producing the energy detection time differential.

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First Claim