Optical elements

Details Optical elements Optical elements

1983-04-25

1985-11-19

Morgenstern, Norman

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350 14, 350442, 350443, 350444, 350620, H01J 314

Patent

active

045544484

ABSTRACT:
An optical element for location between a source of radiation and a detector (13) includes a first optical surface (10) have a central transmissive area (11) and a surrounding area (12) reflective to radiation from direction of the detector (13). A second optical surface (15) is spaced from the first surface (10) towards the detector (13) and has a central reflective area (16) arranged to reflect radiation passing through area 11 towards the reflective area 12. A transmissive area (18) of the second surface (15) surrounds the central area (16), and is itself surrounded by a reflecting area (17) concentric with the detector (13) and forming a reflective shield for the detector.

REFERENCES:
patent: 2520635 (1950-08-01), Grey
patent: 3527526 (1970-09-01), Silvertooth
patent: 3825322 (1974-07-01), Mast
patent: 4342503 (1982-08-01), Shafer
patent: 4392710 (1983-07-01), Rogers

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