Charged particle sensor having magnetic field control

Details Charged particle sensor having magnetic field control Charged particle sensor having magnetic field control

1984-06-21

1989-02-14

Braun, Fred L.

Photocopying

Including fiber optics

118688, G03G 1509, G03G 2100

Patent

active

048049964

ABSTRACT:
An apparatus in which the developability of electrostatically charged particles in a mixture of particulate material is measured. The apparatus includes a transparent member positioned closely adjacent to a developer roller of an electrophotographic printing machine. A brush of particles is formed adjacent the member in one mode of operation, while, in another mode of operation, a cloud of particles is formed adjacent the member. A portion of the charged portions are attracted to the member. A beam of energy is transmitted through the member with the internal angle of incidence being greater than the critical angle of incidence of the member. The intensity of the internally reflected beam is detected and a signal generated indicative of the quantity of charged particles adhering to the member.

REFERENCES:
patent: 4181441 (1980-01-01), Noller
patent: 4195260 (1980-03-01), Sakamoto et al.
patent: 4371257 (1983-02-01), Nishikawa
patent: 4431300 (1984-02-01), Snelling
patent: 4447145 (1984-05-01), Snelling et al.

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