Multi lens for efficient collection of light at varying distance

Details Multi lens for efficient collection of light at varying distance Multi lens for efficient collection of light at varying distance

1992-07-08

1994-09-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250216, G01N 2186

Patent

active

053471377

ABSTRACT:
Optical distance measuring apparatus has a focusing lens (16) directing light reflected from a target toward a detector (18), The lens has discrete or continuous zones each associated with a target distance. The area of the lens zones increases with an increase in associated target distance so as to compensate for a reduction in intensity according to the inverse square law.

REFERENCES:
patent: 4829172 (1989-05-01), Miller
patent: 4882478 (1989-11-01), Hayashi et al.
patent: 4937611 (1990-06-01), Miyazaki

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