Image forming method

A method for forming an image carrying out exposure and development of a toner substantially simultaneously with electrification of a photoreceptor by a carrier using an optical back recording system, comprising:

• a photoreceptor comprising a laminate of a transparent or translucent substrate, a transparent or translucent conductive layer, and a photoconductive layer;
• a carrier and a toner disposed on the photoconductive layer side of said photoreceptor;
• and an imagewise-exposing means, for conducting imagewise exposure, provided at a position on the conductive layer side of said photoreceptor and facing said developing means, characterized in that said carrier meets the following requirements:
• (1) magnetic susceptibility:
• not less than 90 emu/g (at 1 kOe),
• (2) specific surface area:
• 1000 cm.sup.2 /g to 1800 cm.sup.2 /g,
• (3) electric resistivity:
• 10.sup.2 to 10.sup.6 .OMEGA.cm, and
• (4) average particle diameter:
• 20 to 45 .mu.m.

A method for forming an image, comprising carrying out exposure and development of a toner substantially simultaneously with electrification of a photoreceptor by a carrier using an optical back recording system comprising:

• a photoreceptor comprising a laminate of a transparent or translucent substrate, a transparent or translucent conductive layer, and a photoconductive layer;
• a carrier and a toner disposed on the photoconductive layer side of said photoreceptor;
• and an imagewise-exposing means, for conducting imagewise exposure, provided at a position on the conductive layer side of said photoreceptor and facing said developing means, characterized in that said toner meets a requirement that the value determined by the equation 6/(d.sub.t .multidot..rho..sub.t .multidot.S), wherein d.sub.t is the volume average particle diameter of the toner, .rho..sub.t is the density of the toner, and S is the specific surface area of the toner, is in the range of 0.75 to 0.90 and the amount of electrification of the toner as measured by a magnet blow-off method is in the range of 10 to 40 .mu.C/g in terms of absolute value, and said carrier meets the following requirements:
• (1) magnetic susceptibility:
• not less than 90 emu/g (at 1 kOe),
• (2) specific surface area:
• 1000 cm.sup.2 /g to 1800 cm.sup.2 /g,
• (3) electric resistance:
• 10.sup.2 to 10.sup.6 .OMEGA.cm,
• (4) average particle diameter:
• 20 to 45 .mu.m, and
• (5) a flaky iron powder having such a shape that, when sides of a rectangular parallelopiped circumscribed with the carrier are respectively assumed to be A, B, and C with A>B>C, A=B>C, or A>B=C, the average value of B/A is 0.30 to 1.00 and the value of C/A is 0.05 to 0.40.