Fujitsu Corporation

Kouichi Takemura

Takao Sugano

Hiroyuki Matsuo

Shunji Kitagawa

Yukihiro Matsushita

Fumio Kaneko

Masahide Ishigami

Satoru Kobayashi

Yoshitaka Murakawa

Kazuki Ogawa

Kiyoshi Shimada

Mitsuaki Takeguchi

Jun Hirabayashi

An image forming apparatus includes a plurality of light sources emitting beams of light, a photoconductor, a scanner for reflecting the beams of light emitted by the light sources to scan the photoconductor periodically, a light detector for receiving the beams of light from the scanner to determine a beam pitch between the beams of light, the light detector being provided in a part of an optical path between the scanner and the photoconductor, a beam shifter for shifting the beams of light incident on the scanner from the light sources, and a controller for operating the beam shifter so that the beam pitch determined by the light detector becomes a predetermined value.

Image forming apparatus

A color image forming device that can certainly correct uniform velocity error associated with the characteristic of each optical system and can realize high-quality color image printing by performing a fine laser beam irradiating position control, in consideration of an error in surface accuracy of each mirror surface of a rotary polygon mirror. The color image forming device includes a storage unit for holding uniform velocity correction data previously created for each mirror surface of a rotary polygon mirror to correct a distortion in expansion or contraction of the electrostatic latent image in the main scanning direction due to the characteristic of an optical system, and an image clock generating unit for reading uniform velocity correction data on each mirror surface used in the rotary polygon mirror at a scanning time out of the storage unit and then generating image clock pulses for image signal creation with a period corresponding to the uniform velocity correction data. The color image forming device is applicable to printers of electro-photographic systems, electrostatic-recording systems, and the like.

Color image forming device

A light source package includes a light source, a lens for collimating the light from the light source, and a support member for supporting the light source and the lens so that the optical axis of the lens is set to a desired position relative to the light source. The support member includes a compensating device for compensating the lens for deviation of the optical axis of the lens resulting from a difference in the coefficients of linear thermal expansion between the lens and the support member when the ambient temperature changes.

Light source package incorporating thermal expansion compensating device

A light scanning controller includes a plurality of light scanning parts for forming a latent image on a photoconductor by irradiating it with a scanning laser beam, and a clock controller for generating a timing signal by using a single clock signal obtained from a master clock oscillator to transmit the timing signal to each of the light scanning parts which controls the timing of the scanning laser beam on the basis of the timing signal received from the clock controller.

Image forming apparatus with a plurality of image forming units

Growing community of inventors

Kawasaki, Japan

Kouichi Takemura