Contact transfer device and image forming equipment

Details Contact transfer device and image forming equipment Contact transfer device and image forming equipment

1994-10-13

1996-10-08

Beatty, Robert

Photocopying

Contact printing

Light boxes

355277, 430109, 430126, G03G 1516

Patent

active

055636934

ABSTRACT:
An image forming apparatus includes an image carrier, a transfer member contactable to the image carrier for transferring toner to a recording member and a bias source connected to the transfer member. The toner includes resin particles and external additives added thereto. The transfer member satisfies the following relationship, R.gtoreq.0.350+(0.001H) where R represents the aerated bulk density of the toner and H represents the hardness (JISA) of the transfer member. Also, the transfer member satisfies 4.gtoreq.W.gtoreq.16.0-3.52.times.R+0.2.times.R.sup.2, where R represents the logarithmic value of the resistance of the transfer member and W (wt %) represents the amount of external additives added to the resin particles of the toner. In addition, where the resistance of the transfer member is expressed as R(.OMEGA.) and a current value of the transfer bias is expressed as It (.mu.A), the following relationship is satisfied: 1.32.times.10.sup.-4 LV.sub.p .ltoreq. It.ltoreq.2.66.times.10.sup.-3 (log(R)-3.15) LV.sub.p /d and It.ltoreq.1.29.times.10.sup.-2 LV.sub.p /d, where L (mm) is the longitudinal length of the contact surface between the transfer member and image carrier, V.sub.p (mm/s) represents the process speed and d (.mu.m) represents the thickness of the photosensitive layer on the image carrier.

REFERENCES:
patent: 5223900 (1993-06-01), Yuminamochi et al.
patent: 5307122 (1994-04-01), Ohno et al.
patent: 5359395 (1994-10-01), Shimura et al.
patent: 5422214 (1995-06-01), Akiyama et al.
Patent Abstracts of Japan, vol. 017 No. 268 (M-1416), 25 May 1993, & JP-A-05 004372 (Casio Comput Co Ltd) 14 Jan. 1993, *abstract.
Patent Abstracts of Japan, vol. 012 No. 029 (P-660), 28 Janvier 1988 & JP-A-62 180376 (Konishiroku Photo Ind. Co. Ltd.), 7 Aug. 1987, *abstract.
Patent Abstracts of Japan, vol. 016 No. 276 (P-1374), 19 Jun. 1992 & JP-A-04 070858 (Minolta Camera Co Ltd) 5 Mar. 1992, *abstract.

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