Toner quantity measuring device, method of measuring toner...

Details Toner quantity measuring device, method of measuring toner... Toner quantity measuring device, method of measuring toner...

2007-11-06

2007-11-06

Tran, Hoan (Department: 2852)

Electrophotography

Control of electrophotography process

Of plural processes

C399S061000, C399S064000

Reexamination Certificate

active

11070409

ABSTRACT:
A toner quantity measuring device, a method of measuring toner quantity and an image forming apparatus are provided that can accurately measure the toner quantity in an environmentally friendly manner, without having to make contact with a toner carrier and within a shortened period of time. The toner quantity measuring device is designed to measure the quantity of the toner T on a developing roller510which carries coloring agent-containing toner T in the form of a thin layer. The toner quantity measuring device is provided with a chromaticity detector3for detecting average chromaticity of the light which is irradiated from a light source2onto the developing roller510and then reflected by the developing roller510, and a calculator4for calculating the toner quantity based on the average chromaticity detected by the chromaticity detector3.

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Communications from Japanese Patent Office re: related applications.

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