The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 16, 1990
Filed:
Aug. 09, 1989
Akito Yoshimaru, Kawasaki, JP;
Yoichiro Sugino, Kawasaki, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A developing apparatus using a dry developer in the form of a toner. The apparatus includes a housing having an opening which is located to face a photoconductive element. A vent is formed through the housing to release a pressure being developed in the housing, while a filter closes the vent to filter out a toner cloud. A smooth air guide plate which is more than 5 millimeters wide is provided in an edge portion of the opening downstream of a developing position with respect to an intended direction of a rotation of the photoconductive element. The air guide plate is spaced apart from the photoconductive element by a distance less than 2 millimeters and serves to increase the velocity of air flowing into the housing through the opening and, thereby, prevents toner particles from being released to the outside of the apparatus.