Developing device for an image forming apparatus

An image forming apparatus, comprising:

• a developing device for developing a latent image electrostatically formed on an image carrier by a toner, said developing device including,
• first conveying means for conveying said toner deposited thereon,
• regulating means contacting said first conveying means for regulating said toner on said first conveying means to form a thin toner layer while charging said toner by friction, and
• second conveying means contacting said first conveying means and the image carrier for receiving the toner from said first conveying means and causing the charged toner to deposit on the latent image of said image carrier at a position where said second conveying means and said image carrier contact each other;
• wherein said regulating means and said first conveying means contact each other under a pressure of higher than or equal to 20 gf but lower than or equal to 360 gf;
• and
• said toner comprised of particles having a mean particle size of smaller than or equal to 12 .mu.m.

An image forming apparatus, comprising:

• a developing device for developing a latent image electrostatically formed on an image carrier by a toner, said developing device including,
• first conveying means for conveying said toner deposited thereon,
• regulating means contacting said first conveying means for regulating said toner on said first conveying means to form a thin toner layer while charging said toner by friction, and
• second conveying means contacting said first conveying means and the image carrier for receiving the toner from said first conveying means and causing the charged toner to deposit on the latent image of said image carrier at a position where said second conveying means and said image carrier contact each other;
• wherein said regulating means and said first conveying means contact each other under a pressure of higher than or equal to 20 gf but lower than or equal to 360 gf;
• and
• said toner containing magnetic powder dispersed in particles of said toner in a content of between 20% and 60% by weight in each particle.

An image forming apparatus, comprising:

• a developing device for developing a latent image electrostatically formed on an image carrier by a toner, said developing device including,
• first conveying means for conveying said toner deposited thereon,
• regulating means contacting said first conveying means for regulating said toner on said first conveying means to form a thin toner layer while charging said toner by friction, and
• second conveying means contacting said first conveying means and the image carrier, for receiving the toner from said first conveying means and causing the charged toner to deposit on the latent image of said image carrier at a position where said second conveying means and said image carrier contact each other;
• wherein said regulating means and said first conveying means contact each other under a pressure of higher than or equal to 20 gf but lower than or equal to 360 gf;
• and
• said toner comprised of particles containing magnetic powder having a mean particle size smaller than or equal to 1 .mu.m.