Electrostatographic copier/printer densitometer insensitive to p

Details Electrostatographic copier/printer densitometer insensitive to p Electrostatographic copier/printer densitometer insensitive to p

1991-06-24

1992-09-15

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355246, 307311, 328161, 356445, G03G 1500

Patent

active

051482177

ABSTRACT:
A densitometer includes a light source positioned to project light rays to a test surface. A photodetector is positioned to receive light rays from the surface, and has an output which is characteristic of the amount of light received. The densitometer includes a voltage source and a photodetector which generates an output signal which is a function of a measured density and of the voltage of the source. A log amp produces a signal which is substantially proportional to the ratio of the output of the photodetector and a second output signal which is also a function of the voltage of the source.

REFERENCES:
patent: 3911861 (1975-10-01), Griesmer
patent: 3955096 (1976-05-01), Faulhaber
patent: 4080075 (1978-03-01), Berg
patent: 4553033 (1985-11-01), Hubble et al.

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