Method of detecting a toner concentration

Details Method of detecting a toner concentration Method of detecting a toner concentration

G - Physics

03

B

314/37, 324/60

G03B 27/00 (2006.01) G03G 15/08 (2006.01)

Patent

CA 1077557

ABSTRACT A method of detecting a toner concentration in a developer comprising a mixture of a magnetic carrier particle and a non-magnetic toner through the determination of a leakage magnetic flux with a Hall element having a high sensitivity. The mixture is first shaped into a pre- determined configuration and brought in a fixed magnetic field where the leakage magnetic flux is sensed by the Hall element. The shaped mixture may be a magnetic brush per se in case of the well-known magnetic brush device used. Besides, such a Hall element is very susceptible to a variation of inviromental temperature and thus requires a compensation therefor upon the determination of magnetic field. In one aspect achieved by detecting a voltage across the control current terminal of the Hall element and inputting the detected result into an input of analog calculator. - 1 -

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