Electrophotography – Diagnostics – Consumable
Patent
1999-10-27
2000-08-08
Moses, Richard
Electrophotography
Diagnostics
Consumable
399 64, 399 81, 430117, G03G 1310, G03G 1510
Patent
active
061013420
ABSTRACT:
A developer contamination measuring apparatus of a printer includes a first pipe portion having a first gap and a second pipe portion having a second gap, a light emitting unit radiating light to the first pipe portion and the second pipe portion, a light detecting unit detecting light reflected or transmitted from the first pipe portion and the second pipe portion to output first and second light receiving signals, respectively, and a developer contamination measuring unit controlling the light emitting unit, and calculating the degree of a contamination due to mixing of other developing materials with the developer from the first and the second light receiving signals. Thus, the degree of contamination of a developer mixed with other developing materials can be precisely calculated, and the developer can be replaced, when the calculated amount of contamination exceeds a predetermined allowable contamination level, to thereby prevent deterioration of print quality.
REFERENCES:
patent: 5722017 (1998-02-01), Caruthers et al.
Abstract of Japanese Publication JP-A-60192968, Published Oct. 1, 1985.
Eom Yoon-seop
Lee Won-hyung
Yoo Yong-Baek
Moses Richard
Samsung Electronics Co,. Ltd.
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