Developing device and image forming apparatus

Details Developing device and image forming apparatus Developing device and image forming apparatus

2008-05-08

2011-10-04

Gray, David (Department: 2852)

Electrophotography

Diagnostics

Consumable

C399S258000

Reexamination Certificate

active

08032038

ABSTRACT:
A developing device includes a storage portion for retaining developer; a light guide member for forming a plurality of optical paths passing through the storage unit to detect an amount of the developer in the storage portion; a plurality of window members formed in a wall of the storage portion for passing the optical paths therethrough; a blocking member disposed to be movable for blocking the window members; and a drive unit for moving the blocking member. The blocking member is disposed on each of the optical paths. When the drive unit moves the blocking member, the blocking member periodically blocks and opens each of the optical paths in a specific cycle.

REFERENCES:
patent: 5587770 (1996-12-01), Jo et al.
patent: 6337956 (2002-01-01), Sato et al.
patent: 2000231524 (1999-12-01), None
patent: 2003-162138 (2003-06-01), None

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