Method and apparatus for reproducing multi-color image and photoreceptor thereof

Claim 3

charging said photoreceptor with a charging means whereby a first substantially uniform charge is placed thereon, 3. imagewise exposing the surface of said photoreceptor in the presence of an alternating current or a charge opposite to said uniform charge, 4. uniformly exposing said surface with light corresponding to said specific color, whereby a potential pattern is formed on portions of said photoreceptor corresponnding to said specific color, 5. developing said potential pattern by a toner of appropriate color, 6. repeating said uniformly exposing said developing, and 7. subjecting said surface to a second substantially uniform charge opposite to said first uniform charge, before said uniformly exposing in said repating whereby deposition of said toner on unwanted areas is

Claim 4

charging said photoreceptor with a charging means whereby a first substantially uniform charge is placed thereon, 3. imagewise exposing the surface of said photoreceptor in the presence of an alternating current or a charge opposite to said uniform charge, 4. uniformly exposing said surface with light corresponding to said specific color, whereby a potential pattern is formed on portions of said photoreceptor corresponnding to said specific color, 5. developing said potential pattern by a toner of appropriate color, 6. repeating said uniformly exposing said developing, and 7. subjecting said surface to a second substantially uniform charge opposite to said first uniform charge, before said uniformly exposing in said repating whereby deposition of said toner on unwanted areas is

Claim 5

minimized. 2. The method of claim 1 wherein said surface has a substantially uniform surface potential thereon before each said uniformly exposing after said developing said potential pattern by a toner of appropriate color.

Claim 6

The method of claim 1 wherein at least part of the surface potential remaining on said photoconductive layer is eliminated.

Claim 7

The method of claim 3 wherein said surface potential remaining is in areas corresponding to those to which toners adhere.

Claim 8

The method of claim 1 wherein, in said repeating, said developing is carried out so that a developer layer on a developing device makes no substantial dontact with said surface.

Claim 11

charging said photoreceptor with a charging means whereby a first substantially uniform charge is placed thereon, 3. imagewise exposing the surface of said photoreceptor in the presence of an alternating current or a charge opposite to said first uniform charge, 4. forming a primary electrostatic image by uniform exposure of said surface to a primary light which contains a component capable of passing through one said plurality of said filters and containing substantially no component capable of passing through the other pluralities of said filters, 5. developing said primary image by a first color toner, 6. at least partly evening the potentials remaining on said surface by charging with a second uniform charge opposite to said first uniform charge, after developing said primary image, 7. forming a secondary electrostatic image by uniform exposure of asid surface to a secondary light which contains a component capable of passing through another said plurality of said filters and containing substantially no component capable of passing through the remaining plurality of said filters, and

Claim 12

charging said photoreceptor with a charging means whereby a first substantially uniform charge is placed thereon, 3. imagewise exposing the surface of said photoreceptor in the presence of an alternating current or a charge opposite to said first uniform charge, 4. forming a primary electrostatic image by uniform exposure of said surface to a primary light which contains a component capable of passing through one said plurality of said filters and containing substantially no component capable of passing through the other pluralities of said filters, 5. developing said primary image by a first color toner, 6. at least partly evening the potentials remaining on said surface by charging with a second uniform charge opposite to said first uniform charge, after developing said primary image, 7. forming a secondary electrostatic image by uniform exposure of asid surface to a secondary light which contains a component capable of passing through another said plurality of said filters and containing substantially no component capable of passing through the remaining plurality of said filters, and

Claim 13

developing said secondary image by a second color toner.

Claim 14

developing said secondary image by a second color toner.

Claim 15

The method of claim 6 further comprising 9. at least partly evening the potentials remaining on said surface, by charging with a tertiary uniform charge opposite to said first uniform charge, after developing said secondary image, 10. forming a tertiary electrostatic image by uniform exposure of said surface to a tertiary light which contains a component capable of passing through at least said remaining plurality of said filters, and 11. developing said tertiary image by a third color toner.

Claim 16

The method of claim 7 wherein said tertiary light is white light.

Claim 17

The method of claim 8 wherein said primary light is a red light capable of passing through said first filters and second secondary light is a yellow light capable of passing through said second filters.

Claim 18

The method of claim 1 wherein said repeating takes place at least twice.

Claim 19

The method for reproducing multi-color images as claimed in claim 1 wherein there are distributed mutually different spectral transmission characteristics of a layer of plural kinds of fine filters contained in said insulating layer, and wherein at least two kinds of said filters are capable of substantially transmitting a light in any hue.

Claim 20

The method for reproducing multi-color images as claimed in claim 11 wherein a layer provided on said photoreceptor comprises plural kinds of filters, among said fine filters, which are capable of transmitting mainly the rays of light of an identical hue and are mutually different in a maximum percent transmission and/or a maximum transmission wavelength of light.