Method for impression development

A method for impression development which comprises forming a thin layer of a toner on the surface of a developing roller with a control means for adjusting an amount of the toner held on the surface of the developing roller, and developing an electrostatic latent image formed on a photoconductor by contacting the thin layer with the electrostatic latent image,

• said control means comprising a plate-like rigid member whose one surface is pressure-contacted with the surface of the developing roller;
• and
• said toner comprising toner particles wherein a mean value of an odd-shape degree determined from a minimum diameter and a maximum diameter of each toner particle by the following equation (ii):
• odd-shape degree=(minimum diameter)/(maximum diameter) (ii)
• is within the range from 0.5 to 0.8, and a proportion of the number of toner particles having the odd-shape degree of not more than 0.2 is not more than 20%.

A method for impression development which comprises forming a thin layer of a toner on the surface of a developing roller with a control means for adjusting an amount of the toner held on the surface of the developing roller, and developing an electrostatic latent image formed on a photoconductor by contacting the thin layer with the electrostatic latent image,

• said control means comprising a plate-like rigid member whose one surface is pressure-contacted with the surface of the developing roller;
• and
• said toner comprising toner particles, and inorganic fine particles which have a mean particle diameter of 0.1 to 1.0 .mu.m on the volume basis, and which is added to the toner particles in an amount.times.(parts by weight) satisfying the following expression (i):
• 0.1.ltoreq..times.<1.5 (i)
• for 100 parts by weight of said toner particles,
• wherein a mean value of an odd-shape degree determined from a minimum diameter and a maximum diameter of each toner particle by the following equation (ii):
• odd-shape degree=(minimum diameter)/(maximum diameter) (ii)
• is within the range from 0.5 to 0.8, and a proportion of the number of toner particles having the odd-shape degree of not more than 0.2 is not more than 20%.