Ricoh Company, Ltd.

Toru Ohmine

Kenji Sato

Ichiro Komuro

Shuuichi Endoh

Junichi Mizawa

Yasuko Yoshikawa

Masato Mukai

Yohsuke Saitoh

A positional deviation correction pattern includes a first and second pattern image portions adjacent in a sub-scanning direction at the same position in a main-scanning direction, with the same width in the main-scanning direction. Each image portion includes a first side extending in the sub-scanning direction, a second side continuing from one end of the first side and extending in a direction intersecting the sub-scanning direction, and a third side continuing from the other end and extending in a direction intersecting both the sub-scanning direction and the second side. The second sides have the same inclination angle to a virtual line parallel to the main-scanning direction. The third sides have the same inclination angle to the virtual line. A length of one image portion in the sub-scanning direction gradually increases from one end to the other end in the main-scanning direction, a length of the other image portion gradually decreases.

Positional deviation correction pattern, method of forming positional deviation correction pattern, and image forming apparatus

An image forming apparatus includes an image bearer to bear a latent electrostatic image thereon, a developing device to supply a development agent to the latent electrostatic image to obtain a visible image, a transfer roller to contact the image bearer to transfer the visible image to a recording medium, a replenishing device to replenish the developing device with the development agent when a density value read from a density detection pattern formed on the image bearer by the developing device is equal to or less than a threshold, a processing device to conduct a predetermined processing to reduce attachment of the development agent to the transfer roller, and a control device to control the number of times the predetermined processing is performed or processing time in performing the predetermined processing for the processing device, based on whether there is replenishment of the development agent to the developing device.

Image forming apparatus with controller to reduce attachment of development agent to transfer roller

A disclosed image forming apparatus includes a recording unit which records image data on a recording medium; a first spread spectrum clock generator receiving a first clock signal, providing the first clock signal with frequency diffusion to have a first predetermined frequency diffusion width, and outputting a second clock signal; a PLL circuit outputting a third clock signal synchronously oscillating at a frequency obtained by multiplying the frequency of the first clock signal; an image processing unit receiving the third clock signal, and outputting the processed image data in synchronism with the third clock signal; a speed conversion unit receiving the second and third clock signals, and receiving and outputting the image data in synchronism with the second clock signal; and an input and output control unit outputting the image data to the recording unit in synchronism with the second clock signal.

Reducing an EMI effect by preventing the diffuse width with the SSCG from being limited by the jitter standard value in a structure in which a PLL circuit is mounted

Reducing an EMI effect by preventing the diffuse width with the SSCG from being limited by the jitter standard value in a structure in which the PLL circuit is mounted

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Kanagawa, Japan

Toru Ohmine