Fujitsu Corporation

Yoshihiko Taira

Hirofumi Nakayasu

Youji Houki

Tsutomu Nagatomi

Kouichi Kobayashi

Takeo Kojima

Morihisa Kawahara

Takao Sugano

Kazuhiro Tamada

Hiroyuki Kaneda

Hiroji Uchimura

Akihisa Sota

Masao Konisi

There is provided a new image formation apparatus which does not generate a positional gap or discrepancy of a transferred image even when a final product is dependent upon a manufacturing accuracy in the exposure portion, particularly at the time of formation of the color image. Further, the present invention provides a new image exposure apparatus such as an LED head, an EL head, an LD scan unit, etc. which are used for the image formation apparatus. The image formation apparatus comprises an image storage device for storing image information, a read-out device for assigning an image information read-out position of an image storage device to read out the image information, an image transfer unit for transferring an image onto a paper in accordance with the image information read out by the read-out device from the image storage device, and an accuracy information storage device for storing position accuracy information in a scanning direction of the image transfer unit. The read-out device has a device for reading out the position accuracy information from the accuracy information storage device and correcting the image information read-out position by the position accuracy information.

Image formation apparatus and image exposure apparatus

It is an exemplified object of the present invention to provide a manufacturing device and method that can manufacture a high-performance exposure device in a short time. To achieve this object, the manufacturing method of the exposure device is configured to have its part detachable from its main body. This may allow, for instance, a holding member that holds the exposure device after a bonding step of the exposure device is finished while an adhesive is being cured, to be detached from the manufacturing device and to attach another holding member to the manufacturing device to continue the manufacturing process up to a bonding step, thereby reducing or eliminating a downtime of the device.

Manufacturing device and method of the exposure device

The present invention aims at providing an exposure device, image-forming device, and manufacturing method of the exposure device that can reduce a color deviation and form a high-quality multicolor image. An interval of dots in an LED array that is most likely to undergo a thermal influence by radiant and conductive heat from a fixer is made smaller beforehand, whereby the color deviation that would otherwise be produced by the image-forming device is reduced.

Thermal correction for image-forming exposure device and method of manufacturing the device

An exposure device in which an image forming lens is disposed in such a posture that the center line of an image forming is out of axial alignment with the center of beam intensity distribution of the light emitting diode output (the center of beam intensity distribution) so as to reduce possible incidence of stray light when local part of the light output from the light emitting diode array reflects on said wires. As a result, the stray light does not strikes the circumference surface of the image supporting body and the vivid image can be formed.

Image forming apparatus and exposure device thereof

An electrophotography apparatus is provided with one or a plurality of recording units which optically form a latent image on a body. Each of the recording units includes a plurality of light emitting elements having a shape which satisfies a relationship t/y<T/Y<1, where t indicates a width of a pixel of the latent image in a sub scanning direction, y indicates a length of the pixel in a main scanning direction, T indicates a width of a light emitting element in the sub scanning direction, and Y indicates a length of the light emitting element in the main scanning direction.

Electrophotography apparatus and exposure apparatus using particularly shaped light emitting elements

Electrostatic developing units are arranged in the record paper conveyance direction, form dot latent images in conformity with image dot data through the issue of scanning light on photosensitive drums in rotation, and after developing by toner components, transfer dots onto record paper for development. For each lighting noticeable dot amount image dot data, a quantity-of-light control unit provides control and output of optical energy of the noticeable dot on the basis of peripheral dots which may have influence on the size of the noticeable dot on the record paper, for example, in response to the distance from the peripheral dots.

Electrophotographic apparatus with quantity-of-light control

An image forming apparatus includes a transport mechanism transporting a recording medium on a belt which is transported at a constant speed in a transport direction, a plurality of electrostatic recording units arranged in the transport direction of the recording medium and transferring toner images of different colors, a positional error detecting part using the toner image of a reference color transferred by one of the electrostatic recording units as a reference image, and relatively detecting positional error information related to positional errors of the toner images of remaining colors transferred by the remaining electrostatic recording units with respect to the reference image, and a positional error correcting part relatively correcting the positional errors of the toner images transferred by the remaining electrostatic recording units based on the positional error information. The positional error detecting part includes a part for controlling the electrostatic recording units to transfer at least two resist marks on the belt at a scan starting end and a scan terminating end of the belt in a main scan direction which is perpendicular to the transport direction of the recording medium, with respect to each of the colors, and a second part, including a sensor detecting the resist marks, for detecting positional error quantities of the resist marks of each of the remaining colors with respect to the resist marks of the reference color based on detection times of the resist marks of reference color and the remaining colors.

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Kawasaki, Japan

Yoshihiko Taira