Minolta Camera Kabushiki Kaisha

Minolta Company, Ltd.

Mineo Yamamoto

Kouji Matsushita

Suguru Hamamichi

Hideo Kitakubo

Koji Shakushi

Motohiro Yamada

Tomohiko Teranishi

Munenori Nakano

Tetsuya Okashita

Image density is detected by a B/W ratio detection integrator 30 via a video signal 11 from a video controller 40 when an image signal is inputted. When a latent image formed on a photosensitive body 7 in accordance with the image signal is transferred to a transfer material 12 by a transfer charging device 8, a transfer current of the transfer charging device 8 is controlled in a timely fashion by a CPU 20 in accordance with the image density detected from this image signal, thus ensuring optimum transfer efficiency. Even when the environment and printing pattern change for each part of a single-page image, this makes it possible to deal accurately with these changes to ensure stable transfer efficiency and good imaging.

Image formation device

An image density control apparatus which includes a photoreceptor having a photosensitive surface to be uniformly charged to a reference potential and formed with a charge latent image by a reference light amount, a device for developing the charge latent image at a reference developing potential so as to obtain a test pattern, a device for detecting density of the test pattern so as to control image forming condition during an actual image formation according to the detected value. The image density control apparatus further includes a reference condition control device which sets the reference image forming condition for forming the test pattern in accordance with the image forming condition for forming a document which was previously set by detecting a representative density of the document.

Imaging density control apparatus

An image forming apparatus having a developing device wherein a developing material of a toner and a magnetic carrier is circularly transported from a toner supply portion to a developing region formed between the developing device and a photosensitive member while mixing the developing material. The developing device is provided with a sensor for detecting a toner density of the circulating developing material at a specified detection position in the developing device, and the toner is supplied from the supply portion to the developing material at the specified detection position and to the developing material at a minimum of one position other than the detection position when the detected toner density of the developing material is less than a predetermined standard density.

Developing means and method for supplying toner to a density detection

Growing community of inventors

Toyohashi, Japan

Mineo Yamamoto