Image forming apparatus using a developer including invisible an

Details Image forming apparatus using a developer including invisible an Image forming apparatus using a developer including invisible an

1988-03-11

1990-06-19

Moses, R. L.

Photocopying

Contact printing

Light boxes

355266, 430110, 430111, G03G 1500, G03G 900

Patent

active

049357824

ABSTRACT:
An image forming apparatus including a first image forming unit for forming a first electrostatic latent image having two distinct portions on an image carrier, a first developing unit for developing the first electrostatic latent image into a first visible image on the image carrier, a charging unit for charging the image carrier with the first visible image thereon, a second image forming unit for forming a second electrostatic latent image on the image carrier, a second developing unit for developing the second electrostatic latent image into a second visible image on the image carrier, and a transferring unit for transferring the first and second visible images from the image carrier onto an image bearing medium. In the image forming apparatus, the first developing unit contains a developer including colored particles and additive particles, the additive particles having a color substantially the same as the image bearing medium or being substantially colorless and transparent, and a bias voltage applied across the first developing unit and the image carrier for transferring the colored particles onto one of the two distinct portions of the first electrostatic latent image and the additive particles onto the other of the two distinct portions of the first electrostatic latent image.

REFERENCES:
patent: 3013890 (1961-12-01), Bixby
patent: 3910698 (1975-08-01), Fukushima et al.
patent: 4078929 (1978-03-01), Gundlach
patent: 4611901 (1986-09-01), Kohyama et al.
patent: 4623605 (1986-11-01), Kato et al.

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