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:
Jun. 15, 1982
Filed:
Jan. 30, 1980
Yoshiro Suzuki, Hachioji, JP;
Olympus Optical Company Limited, Tokyo, JP;
Abstract
An electrophotographic apparatus of the retention type for forming a number of copies from the same and single electrostatic charge image once formed on a photosensitive drum by repeating successively developing and transferring operations. The electrophotographic apparatus includes a magnetic brush developing device having a fixed magnet, an aluminum sleeve arranged rotatably around the magnet, and an electrically insulating surface layer applied on the sleeve, on which sleeve surface a two component developing agent consisting of magnetic carriers and insulating toners is adhered as furs of a magnetic brush, whereby a magnetic flux density measured at the sleeve surface in a developing area is set to 600 to 800 Gauss, preferably 650 to 750 Gauss and a distance between the drum and the sleeve is selected to 2 to 5 mm, preferably 3 to 4 mm.