Toner content monitoring system for use in a recording head for

Details Toner content monitoring system for use in a recording head for Toner content monitoring system for use in a recording head for

1996-09-20

1999-05-18

Burr, Edgar

Incremental printing of symbolic information

Ink jet

Controller

101DIG45, 399 64, B41J2/195

Patent

active

059055103

ABSTRACT:
A system for monitoring the toner content in ink. The system comprising a light source and a photo-detector disposed in a ink chamber wall, a controller and a display unit. A content-monitoring voltage V1 and an operation-checking voltage V2 are determined from experiments in advance. V1 and V2 are such light source voltages when a predetermined current Ith is obtained from the photo-detector for the minimum and maximum allowable toner contents, respectively. In usual operation in user site, operation of the system is checked with the light source voltage set for V2 in response to a power-on or a reset. Then, a monitoring of the toner content is started with the light source voltage set for V1. In a toner content monitoring, the sensor current is checked to see if it is equal to or larger than Ith.

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