Electrophotographic image forming apparatus using photoconductiv

Details Electrophotographic image forming apparatus using photoconductiv Electrophotographic image forming apparatus using photoconductiv

1990-02-12

1991-10-01

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355251, 355326, G03G 1506

Patent

active

050538217

ABSTRACT:
A photoconductive image forming apparatus in which charged photoconductive toner contacts a transparent insulating substrate and is exposed from within the substrate. Exposure reduces the resistivity of the toner so that its charge can be reversed by a bias voltage and the exposed toner will adhere to the image forming substrate simultaneously with exposure and then transfer to a transfer medium. In an alternative embodiment of the invention, a layer of toner is applied to an electroconductive substrate and the toner layer is exposed with a latent image. The charge of the exposed toner is reversed and the exposed toner is removed by an intermediate toner removal device. The remaining toner is then transferred to a transfer medium. Toner suitable for use includes azo-type metal containing black dyes which do not absorb the exposure and can be sensitized to the near infrared region. Multicolor toners, each sensitized to a different exposure wavelength are provided so that a single multiple wavelength exposure and a single development can be used to form multicolor images.

REFERENCES:
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patent: 3676118 (1972-02-01), Mott et al.
patent: 3852208 (1974-12-01), Nagashima
patent: 4007044 (1977-02-01), Shiga
patent: 4521502 (1985-06-01), Sakai et al.
patent: 4542084 (1985-09-01), Watanabe et al.
patent: 4693951 (1987-09-01), Takasu et al.
patent: 4921768 (1990-05-01), Kunugi et al.
patent: 4950570 (1990-08-01), Sano et al.

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