Low cost sensitometer which provides highly accurate readings

Details Low cost sensitometer which provides highly accurate readings Low cost sensitometer which provides highly accurate readings

1977-08-08

1978-12-26

Hix, L. T.

G03B 4100

Patent

active

041313496

ABSTRACT:
The present sensitometer has its light source energized, through a constant voltage transformer and is initially energized while being covered by a rotating sector shutter which does not permit the light source to send light to the material whose light sensitivity is being measured, until the light source is stabilized. The shape of the sector shutter determines how long the light source is covered to effect light and power stabilization. In addition, the present sensitometer provides a means to filter light from the light source as needed. In addition, the present sensitometer has a top piece which prevents damage to the graded gray scale means but permits ready availability to the light.

REFERENCES:
patent: 1832294 (1931-11-01), Gent
patent: 1883884 (1932-10-01), Doran
patent: 3002425 (1961-10-01), Biedermann et al.
patent: 3522288 (1971-01-01), Corley

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