Canon Kabushiki Kaisha

Izumi Narita

Kaoru Sato

Yuzo Seino

Tatsuto Tachibana

Akihisa Kusano

Noboru Koumura

Yukio Nagase

Tomohiro Nakamori

Seiji Mashimo

Kenji Muto

Keiichi Iwamura

Masaki Kuribayashi

Takayuki Aizawa

Takatoshi Suzuki

Yasushi Sato

Yasunori Chigono

Katsuhiro Sakaizawa

Yukihiro Ohzeki

Yukihide Ushio

Kenya Ogawa

Naohiro Nakane

Kazunori Taira

A light-emitting device is disclosed which includes a light-emitting element array formed by arranging a plurality of light-emitting elements, a driving unit for driving the light-emitting element array to emit light from each of the light-emitting elements, a memory unit for storing the number of light emissions for each light-emitting element of the light-emitting element array, and a control unit for controlling the driving unit based on the information stored in the memory unit so that the amount of light emitted from each light-emitting element is held constant. An exposure device employing the light-emitting device, and an image forming apparatus employing the exposure device are also disclosed.

Light-emitting device, exposure device, and image forming apparatus

An exposure device having an array of a plurality of light emitting elements composed of at least an anode layer, a cathode layer and one or more organic compound layers interposed between the anode layer and the cathode layer all of which are formed on a substrate. In the exposure device, the quantity of light emitted from each light emitting element is made uniform by controlling the light emitting area of each light emitting element. Therefore, the exposure device eliminates differences in the quantity of emitted light among the plurality of light emitting elements without using a special drive circuit.

Light emitting element array, exposure device and image forming apparatus

An optical print head and an image formation apparatus which can form a satisfactory image without shortening an exposure time in an image processing at high speed. A satisfactory image is formed at high speed by alternately radiating a first light emitting element array and a second light emitting element array under a predetermined driving condition depending on a relation between a distance d in a Y direction between elements perpendicular to an array direction X of light emitting elements and an image resolution pitch P by using the optical print head composed of two light emitting element arrays.

Print head and image formation apparatus

Provided is a light emitting apparatus capable of preventing light emitting elements made of an organic compound from being affected by moisture in an ambience, thereby increasing their lifetime, and suitably applicable to an exposure section of the electrophotographic method. Temperature sensors are set next to a light emitter array which is an array of many light emitting elements made of the organic compound. A drive control unit of the array is composed of CPU, ROM, RAM, and I/O ports. The CPU carries out control of each unit according to input data of image information etc. and also carries out pre-heat control for the light emitting elements. The temperature sensors detect the temperature of the light emitting elements and the CPU, receiving their detection output, turns the light emitting elements or a heating element provided separately, on and off so that a detected temperature value becomes a predetermined value in a waiting state without the input data. In the waiting state the light emitting elements generate heat per se to be kept at the predetermined temperature.

Light emitting apparatus with temperature control, exposure apparatus, and image forming apparatus

The exposure device of an image forming apparatus includes a light-emitting device array having light-emitting devices; a switching device array including switching devices connected to the light-emitting devices, the switching device array being divided into a plurality of groups; a first line group for connecting commonly to first terminals of switching devices of each of the groups; a second line group for connecting commonly to second terminals of switching devices of each of the groups; and a circuit for performing simultaneous light emission of the light-emitting device array to expose the photosensitive member.

Image forming apparatus

A high-quality image is formed by using light emission element arrays of plural lines. The plural light emission element arrays are arranged substantially in parallel, an area of a light emission part of each array being different from others, respective light emission elements in the light emission element arrays are caused to selectively perform light emission according to gradation data, and the respective light emission element arrays overlappingly perform exposure on a relatively moved photosensitive body.

Exposure apparatus and image formation apparatus

A light emitting apparatus including a photosensitive member and an exposure device including a light emitting device array made up of a plurality of light emitting devices arranged in a direction of main scan across a moving direction of the photosensitive member and a switching device array made up of a plurality of switching devices arranged and connected to the light emitting devices in one-to-one relation. The switching device array is divided into a plurality of groups, a first group of leads connected in common to first terminals of the switching devices for each of the plural groups of switching devices, a second group of leads connected to second terminals of each of the switching devices, and a third group of leads, each of the third group of leads connected to third terminals of each switching device in a respective group of switching devices. The apparatus further includes a drive device for operating the simultaneous light emitting circuits to apply a first scan signal to the first group of leads, a voltage signal with one polarity to the third group of leads in synch with the first scan signal, and a discharge signal to the second group of leads, thereby causing capacitors to be discharged.

Image forming apparatus and light emitting apparatus

It is an object to provide an image recording apparatus for recording an image of high resolution at a high speed. An electrostatic latent image is recorded onto a photosensitive material by using a recording head which has a plurality of switching elements which are arranged in an array shape and sequentially turn on the adjacent switching elements and light emission element arrays of a plurality of columns each of which is constructed by arranging light emission elements, in an array shape, which are connected to the switching elements and which are arranged in almost parallel, and in which each of the switching elements turns on the corresponding light emission element, so that the plurality of light emission elements are scanned. Developing means develops the electrostatic latent image and transfer means transfers the developed latent image onto a recording paper.

Recording chip, recording head, and image recording apparatus

A printer buffer unit is connectable to one or a plurality of host computers and one or a plurality of printers. The printer buffer unit has a unit for detecting a break of print job data sent from a host computer, and a unit for adding a job offset command at the time of the break in sending the print job data to a printer.

Printer buffer unit

Printer buffer unit detecting phase of transition signal to initiate job

An apparatus for generating a laser beam modulated on the basis of an information signal, which comprises a circuit for generating a first information signal, a circuit for generating a second information signal, independent of the first information signal, a circuit for driving a semiconductor laser on the basis of the first and the second information signals, wherein the driving circuit comprises first and second switching elements which operate supplementarily with each other, one of the first and second switching elements switches a drive current to the semiconductor laser, and wherein the first information signal is provided into a control terminal of the first switching element and the second information signal is provided into a control terminal of the second switching element.

Differential driving circuit for a semiconductor laser

An apparatus using a semiconductor laser comprises a measuring unit for measuring a slope efficiency of the semiconductor laser; a determination unit for determining whether or not the measurement value reaches a specified value; and a notification unit for notifying the determination result of said determination unit.

Semiconductor laser control apparatus and image forming apparatus using

A hybrid type image forming apparatus capable of forming a high quality image by using two image forming units having different resolution from each other, perform high throughput image forming by selecting most suitable image forming method or methods depending upon a kind of input image data, and reducing its running cost. In the apparatus, input image data of resolution of 300 dpi is separated into monochromatic image data and color image data. The monochromatic image data is converted into that of 600 dpi so that four pixels of an image of 600 dpi make one pixel of an image of 300 dpi. Then, a monochromatic image is formed on the basis of the monochromatic image data of 600 dpi by the image forming unit employing the electrophotograph method. A print medium on which the monochromatic image is formed is conveyed to the image forming unit employing the ink-jet printing method where a color image is formed on the basis of the color image data of 300 dpi.

A multiplier calculates a product S'(x)=S(x).multidot..lambda.(x) mod X.sup.d-1 of a syndrome polynomial S(x) generated by a syndrome generator and an erasure position polynomial .lambda.(x) generated by an erasure position polynomial generator, modulo X.sup.d-1. A constant multiplier sequentially multiplies coefficients of the polynomial S'(x) and the erasure position polynomial .lambda.(x) with a power of a primitive root .alpha. of a code. The power exponents in this multiplication are determined in units of coefficients. Every time this multiplication is executed, an adder sequentially adds predetermined combinations of products. A plurality of arithmetic and logic operations according to the numbers of correctable erasures and errors are sequentially executed using the sums. A divisor and dividend are selected in accordance with the number of erasures included in the code on the basis of the plurality of arithmetic and logic operation results. A division is executed using the selected divisor and dividend. A value at a position, discriminated to be an error position, of the code is corrected based on the division result, thus performing error correction including erasure correction with a simple circuit arrangement.

Growing community of inventors

Shizuoka-ken, Japan

Izumi Narita