Patent Document ID: 4486088
Application ID: 06383098
Patent Status: 1

Claim One:
1. An electrophotographic apparatus capable of selectively operating in a first or second operation mode to provide a high-low order between the potentials of the light area and dark area of a latent image formed in the first operation mode, which order is a reversal of the corresponding order between the potentials of the light area and dark area of a latent image formed in the second operation mode, said apparatus comprising: (a) a photosensitive member having a photoconductive layer and an insulating layer formed on the photoconductive layer and moving through a first, a second and a third position in this order, said photoconductive layer having a property of substantially rejecting, in the dark area, the injection thereinto of charges of the polarity opposite to a first corona discharge; (b) first corona discharger for applying said first corona discharge on the photosensitive member at said first position, the polarity of the first corona discharge being the same in the first and second operation modes; (c) a second corona discharger for applying a second corona discharge on the photosensitive member at said second position, the second corona discharge having a component of the polarity opposite to the first corona discharge; (d) a first illumination means for uniformly illuminating the photosensitive member at said third position; (e) a second illumination means operating in the first operation mode but not operating in the second operation mode, the second illumination means, when operated, uniformly illuminating the photosensitive member at the first position or between the first and second positions; and (f) image light exposure means, the position of the image light exposure to the photosensitive member being capable of switching over between the first and second operation modes, the image light exposure means exposing the image light to the photosensitive member in the first operation mode at said second position and in the second operation mode at said first position or between said first and second positions.