Canon Kabushiki Kaisha

Junnosuke Kataoka

Masahiro Sakamoto

Takehiro Yoshida

Yasuo Fujii

Shigeo Miura

Toru Nakayama

Shigeru Koizumi

Mamoru Osada

Hiroyuki Noguchi

Yasuhide Ueno

Yasuyuki Shinada

Yuji Kurosawa

Masaaki Okada

A memory control circuit capable of holding a memory device in a self-refresh mode even when a memory controller is powered off and then restarted. The controller performs data memory reset processing including deleting data in a buffer of a volatile memory device which operates when supplied with power from a first power supply, by changing an effective memory reset signal after the voltage of a second power supply becomes equal to or higher than a predetermined value. The memory reset signal is masked when an effective mask signal is generated. Whether to keep the data is determined when an event occurs which makes the voltage of the second power supply lower than the reset reference value and the first power supply is on. The memory reset signal is masked by making the mask signal effective when the data is determined to be kept.

Memory control circuit for controlling memory device that operates in self-refresh mode, and method of controlling the same

An image processing apparatus that is operable by AC power and DC power. The image processing apparatus includes a fixing heater section for heating a recording sheet having toner transferred thereon so as to fuse the toner onto the sheet and a plurality of electronic circuits. An AC power supply circuit section receives AC power from an AC power supply line. A DC power supply circuit section receives DC power from a DC power supply line. A power supply unit supplies the AC power received by the AC power supply circuit section to the fixing heater section, and the DC power received by the DC power supply circuit section to the plurality of electronic circuits.

Image processing apparatus operable by AC power and DC power, method of controlling the apparatus, and storage medium

Disclosed is an information processing apparatus having a first memory and being capable of installing a second memory. The apparatus moves target data to be backed up stored in the first memory into the second memory, in a case that the second memory is installed in the information processing apparatus, and releases an memory area of the first memory in which the target data was stored, and sets the second memory to be backed up in a case that the second memory is installed in the information processing apparatus, and sets the first memory to be backed up in a case that the second memory is not installed in the information processing apparatus.

Information processing apparatus and method of backing up memory in said apparatus

In an image reading apparatus for reading an original image, an optimum charge storage time of a line image sensor ( ) in generating shading correction data and an optimum charge storage time of the sensor in reading an original image using the generated data are stored in a storage time setting unit ( ) in correspondence with each of the first reading mode in which the image of an original placed on an original table ( ) is read while moving the sensor and the second reading mode in which the image of an original fed by an ADF one by one is read at a predetermined position while fixing the sensor at the position. To actually read an original image in the first or second reading mode, an optimum value is selected from the plurality of stored storage times and used.

Image reading apparatus

A recording apparatus such as a facsimile apparatus comprises a first control unit to perform a control regarding the generation of dot data, a second control unit for controlling the recording operation, a fan to reduce a temperature in the apparatus, a heat fixing device having a heater, and detectors such as thermistors for detecting temperatures at a plurality of positions near the fixing device. Each of the first and second control units generates a first control signal to control the rotation of the fan on the basis of detection outputs from the thermistors. The heat fixing device has a cylindrical endless film made by polyimide or the like whose inner surface is come into contact with the heater and a pressure roller which is come into contact with the outside of the endless film. A recording paper is sandwiched between the film and the pressure roller and passes therebetween.

Recording apparatus with dual independent control limits

A facsimile apparatus can output a plurality of kinds of audible sounds. In the apparatus, the level of a sound is increased when outputting a specific audible sound compared with when outputting audible sounds other than the specific audible sound.

Facsimile apparatus

A facsimile apparatus for high-speed transmission of a plurality of images. If the last one line of an image data to be transmitted first among the connected images is not an all-white line, an all-white line is added to the data and the image data is MMR-encoded. Further, zero to N-1 '1' bits (N : a system bus width) are added to the coded data so as to render the coded data a multiple of a predetermined data unit. The coded data is transferred to a modem for image transmission. Thereafter, a subsequent MMR-coded image data is transmitted. The apparatus can thus transmit byte-packed image data stored in a memory in advance for image transmission without decoding and encoding the image data or re-executing byte-packing.

Facsimile apparatus having improved coding for transmission of plural

In an image processing apparatus, comprising: image data sent from a transmission-side apparatus is received, and discrimination is performed as to whether the image data received is a character image or a halftone image segmentation processing is then performed on the reception data. When the discrimination means discrimitaes that the received image data is a character image, interpolation processing is performed on the basis of reception image data in a predetermined area, to perform segmentation processing of image data of a pixel of interest, and so the apparatus can perform segmentation processing of input data by simple control at high speed and low cost.

Image processing apparatus

A drive control system for a stepping motor which stores values for the current driving each phase of the motor in data tables. A central processing unit drives the motor in accordance with the current values stored in the data tables. The current values are stored in the data table with corresponding addresses. The current values are read out sequentially from the addresses in the data tables. Each time the address is incremented by 1, the magnitude of the angle of rotation of the motor is set so that it is always the same.

Drive control system of stepping motor

In a stepping motor drive control mechanism, a step drive command is applied sequentially at irregular intervals to drive a stepping motor. When the step drive command is to the stepping motor the stepping motor is driven by one step angle. According to the response characteristic of the stepping motor, an inhibited period when the reception of the next step drive command is inhibited and a reception period when the reception is enabled are set up. If the next step drive command is applied during the inhibited period, the system waits until the reception period. Then, the stepping motor is driven by one step angle.

Stepping motor drive control system

The present invention relates to control of motor and strobe pulses in a printer which feeds a paper by a stepping motor and prints data by strobe pulses. A uniform record line density is attained by non-linearly changing currents and interval of phase excitation pulses for trigger of the motor and timing of the strobe pulses.

Recording control system for a recording apparatus

A scanning device comprises: a stepping motor; a memory device for storing drive data for driving the stepping motor for each scanning unit which does not correspond to each drive step of the stepping motor; and a motor driving device for driving the stepping motor in accordance with the drive data read from the memory device.

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Tokyo, Japan

Junnosuke Kataoka