Fuji Xerox Co., Ltd.

Satoshi Kurashima

Atsushi Ugajin

Tomoaki Sakita

Kohei Shioya

Tetsuya Hori

Yasuhiro Arai

Hirokazu Tsubota

Masaki Fujise

Toshio Hisamura

Osamu Yasui

Yoshitake Matsubara

A light quantity control device includes a light quantity detecting unit and an output unit. The light quantity detecting unit detects a quantity of laser light emitted from semiconductor laser elements which are mounted on plural mount devices. The output unit is provided on at least a reference mount device among the plural mount devices and outputs, to another mount device other than the reference mount device among the plural mount devices, an output result which is obtained through comparison and correction of a value detected by the light quantity detecting unit and a reference value.

Light quantity control device, exposure device, and image forming apparatus

An exposure device includes a reference current generating unit generating a reference current for each image of respective colors, a photoelectric current generating unit generating a photoelectric current in response to a light amount of the light emitting element, a driving unit driving the light emitting element, a first controller, a drive voltage holding unit holding a drive voltage given to the driving unit, a second controller controlling the driving unit based on the drive voltage held, a comparison current generating unit generates a comparison current, a difference current generating unit generating a difference current, of each color, corresponding to a difference between the reference current of each color and the comparison current. The first controller compares a value obtained by adding the difference current of each color to the photoelectric current with the comparison current to control the driving unit so that the photoelectric current becomes the reference current.

Exposure device for controlling light emitting elements

An exposure device includes plural light-emitting elements, a light amount detection unit, a controller, plural holding units and a connection unit. The controller sequentially determines control values of the light-emitting elements based on comparison between the light amounts detected by the light amount detection unit and a predetermined reference value. The holding units are provided for the light-emitting elements, respectively. Each holding unit holds a control voltage of the controller. When the controller is to sequentially determine control values of a part of the plurality of light-emitting elements, the connection units connects the controller and the holding units corresponding to one or more light-emitting elements for which control values are determined earliest among the part of the plural light-emitting elements, before the controller determines the control values of the one or more light-emitting elements.

An exposure device includes a plurality of light emitting elements, a load, a first supplying unit and a second supplying unit. The first supplying unit supplies a driving current to one of (i) light emitting elements used to form an image among the plurality of light emitting elements and (ii) the load, in accordance with a modulation signal. The first supplying unit supplies a bias current to the other. The second supplying unit supplies the bias current to light emitting elements not used to form the image among the plurality of light emitting elements, regardless of the modulation signal.

Exposure device, image forming apparatus, and computer-readable medium

An image formation system includes a medium-pattern-information-read-unit that reads pattern information of a surface of a medium; a pattern-information-image-creation-unit that creates a pattern Information image based on the read pattern information; and a print unit that adds the pattern information image to a print image to be printed on the surface of the medium and prints the print image on the medium.

Image formation system adding pattern information to print image based on read pattern information from medium surface for determining if medium is original

An image forming apparatus includes a paper fiber reading unit that reads fiber properties of a paper sheet; an encryption unit that encrypts at least a part of an input image based on the fiber properties read by the paper fiber reading unit; and a printing unit that prints an encrypted image portion encrypted by the encryption unit and an image including information representing the fiber properties read by the paper fiber reading unit on the paper sheet whose fiber properties are read by the paper fiber reading unit.

Growing community of inventors

Kanagawa, Japan

Satoshi Kurashima