Toshiba Tec Kabushiki Kaisha

Kabushiki Kaisha Toshiba

Shigeru Morino

Tadao Kamano

Hiroshi Yamaguchi

Hitoshi Ushiogi

Hidenobu Suzuki

Takashi Kashiwagi

Hiroyuki Takada

Hiroaki Watanabe

Izumi Araki

Kyouichi Shibata

According to one embodiment, an image forming apparatus includes a sheet supply unit, a printer, a fixing device, and a controller. The sheet supply unit supplies a sheet from a sheet container. The printer forms a toner image to the sheet conveyed from the sheet supply unit. The fixing device includes a heater, a fixing belt, and a pressure roller. The heater includes a heat generating member including a plurality of heating elements arranged in a first direction orthogonal to a sheet conveyance direction and in which a heating element group selected in response to a printing request from the heat generating member generates heat. The fixing belt fixes the toner image heated by the heater to the sheet. The pressure roller presses the fixing belt.

Image forming apparatus and method of forming an image

A print head includes a memory, an input and output unit, and a plurality of light emitting elements. The memory is configured to store a first light quantity value obtained by measuring a light quantity of each of the plurality of light emitting elements when supplied with a first reference current value, and a light quantity difference value between the first light quantity value and a second light quantity value obtained by measuring a light quantity of each of the plurality of light emitting elements when supplied with a second reference current value. The input and output unit is configured to output the first light quantity value and the light quantity difference value and receive a correction value determined based on the first light quantity value and the light quantity difference value. The light emitting elements are configured to emit light based on a correction current value corresponding to the correction value.

Print head and image forming apparatus

An image forming apparatus includes a conveyance controller and a processor. The conveyance controller controls a conveyance operation for conveying an image forming medium. The processor executes an image quality maintenance operation for maintaining quality in an image forming processing. The processor executes at least a part of the conveyance operation and a part of the image quality maintenance operation in parallel.

Image forming apparatus and control method

An image forming apparatus comprises an image forming section configured to form an image on a sheet, a fixing section configured to heat the sheet having the image formed thereon to a fixing temperature, and a control section. The control section is configured to adjust parameters of the image forming section to reduce deterioration in image quality of the image formed by the image forming section and to carry out the adjustment while a temperature of the fixing section is being changed by greater than a predetermined amount and to not carry out the adjustment while the temperature of the fixing section is changed by less than a predetermined amount.

Image forming apparatus configured to adjust image forming parameters based on length of time taken to change fixing section temperature from a current temperature to a target temperature

A serial data transfer apparatus includes a decoder, a counter, and a calculation circuit. The decoder is configured to decode serial data to obtain written data, a base address, and transfer type information for specifying a storage unit for storing the written data. The counter is configured to count a frame synchronization pulse. The calculation circuit is configured to generate a chip select signal based on the transfer type information and the base address, as decoded by the decoder, and a count value of the frame synchronization pulse output by the counter.

Serial data transfer using transfer type information to select a storage unit

According to an embodiment, an image processing apparatus has a monitoring unit, and an arbitration unit. The monitoring unit monitors a data amount in a first transfer buffer of a first image processing unit, and a data amount in a second transfer buffer of a second image processing unit. The arbitration unit arbitrates, so that when the data amount in the first transfer buffer becomes not less than a predetermined first threshold value, the number of times of data transfer from the first transfer buffer to a main memory is increased. Furthermore the arbitration unit arbitrates, so that when the data amount in the second transfer buffer becomes not more than a predetermined second threshold value, the number of times of data transfer from the main memory to the second transfer buffer is increased.

Image processing apparatus and data transfer control method

An ink-jet printer includes a sheet feed-in mechanism,for feeding a paper sheet, a rotary drum,having a peripheral surface,of a size larger than the paper sheet to be fed by the sheet feed-in mechanism,, for rotating at a constant speed, a sheet holding system,for holding the paper sheet on the peripheral surface of the rotary drum, a print head,for printing an image by repeatedly ejecting ink onto the paper sheet held on the peripheral surface of the rotary drum,while the rotary drum,performs a predetermined number of rotations, a sheet separator,for separating the paper sheet from the peripheral surface,of the rotary drum, a sheet feed-out mechanism,for feeding out the paper sheet separated by the sheet separator,, a control unit,for controlling the sheet feed-in mechanism,, the rotary drum,, the sheet holding system,, the print head,, the sheet separator,and the sheet feed-out mechanism,. In particular, the control unit,is constructed such that the sheet holding system,, the print head,and the sheet separator,are sequentially driven on the basis of the number of rotations of the rotary drum

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Numazu Shizuoka, Japan

Shigeru Morino