Light measuring apparatus incorporating means for shielding ligh

Details Light measuring apparatus incorporating means for shielding ligh Light measuring apparatus incorporating means for shielding ligh

1979-12-10

1982-03-23

Evans, F. L.

Optics: measuring and testing

By shade or color

With color transmitting filter

355 38, 356404, G01J 350

Patent

active

043209769

ABSTRACT:
A light measuring apparatus for measuring the light transmitted through filters to a light sensor is equipped with a filter wheel having non light transmissive segments alternating with the light transmissive filters, which filter wheel is manually rotatable by a lever. By repositioning the lever through a certain angle, its motion is translated via a spring and various gears and additional transmission elements to rotate the filter wheel and periodically shield the light sensor. The shielding of the light sensor for short periods permits a determination of an error signal in the light measuring apparatus. To obtain a shielding time period above a required minimum independent of the speed with which the lever is moved, the motion of the filter wheel is automatically delayed by mechanical means.

REFERENCES:
patent: 3067649 (1962-11-01), Szymczak
patent: 3892493 (1975-07-01), Pallingen et al.
patent: 3984185 (1976-10-01), Vinatzer

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