Canon Kabushiki Kaisha

Toshihiko Otsubo

Tetsuro Fukusaka

Takahiro Watanabe

Michio Kawase

Yutaka Udagawa

Jun Yamaguchi

Kazuyoshi Suzuki

Masahiro Nishio

Keiju Kuboki

Yasuhiro Yamada

Hiroshi Tanioka

Shinobu Arimoto

Jun Koide

Takashi Soya

Kiyohisa Sugishima

Mitsuo Shiraishi

Eiichi Nishikawa

Mitsuru Amimoto

Seita Shono

Yuji Matsuda

There is provided a communication system which is capable of resetting sub-communication ICs without providing special reset signal lines for transmitting a reset signal and also capable of properly transmitting a communication reset signal to the sub-communication ICs to reset the same when the system is in an abnormal state or when the power supply is turned off, an image forming apparatus provided with this communication system, an initialization method, and a storage medium that contains a program for executing the method. A host CPU controls the whole communication system. A communication controller controls a serial communication. A plurality of sub-communication ICs transmit serial data between themselves and the communication controller. A first reset IC resets the host CPU, and a second reset IC rests the communication controller. The first and second ICs reset the host CPU and the communication controller, respectively, according to different setting conditions. More specifically, the first reset IC resets the host CPU when the power supply voltage of the communication system is lower than a first predetermined value, and the second reset IC resets the communication controller when the power supply voltage is lower than a second predetermined value that is lower than the first predetermined value.

Communication system, image forming apparatus, initialization method, trouble compensation method and storage medium

An image recording apparatus includes at least one recording head, in which a plurality of solid-state recording elements are arranged, for performing image recording by causing each of the plurality of solid-state recording elements to record a pixel, a storage unit for storing correction data for correcting image data in accordance with a recording characteristic of each of the plurality of solid-state recording elements so as to correspond to the corresponding one of the plurality of solid-state recording elements. Each of the plurality of solid-state recording elements is driven in accordance with input image data and the correction data stored in the storage unit. The apparatus also includes a pattern-data generation unit for generating predetermined pattern data, and for causing each of a predetermined number of consecutive solid-state recording elements from among the plurality of solid-state recording elements to record a pixel based on the predetermined pattern data, a reading unit for reading a test pattern recorded by the recording head based on the pattern data generated by the pattern-data generation unit, an acquisition unit for acquiring the recording characteristic of each of the plurality of solid-state recording elements based on a ratio of a number of solid-state recording elements which have recorded pixels in accordance with the predetermined test pattern to a number of pixels of the test pattern read by the reading unit, and a changing unit for changing the correction data for each of the solid-state recording elements in accordance with the recording characteristic of the corresponding one of the solid-state recording elements acquired by the acquisition means. The image recording apparatus can exactly detect the recording characteristic of each of the plurality of solid-state recording elements, and prevent nonuniformly in density caused by individual difference in the recording characteristic during image recording.

Image recording apparatus and copying system

An image forming apparatus has a recording element array including plural recording elements, an image forming section for causing a relative movement between the recording element array and a recording medium, thereby to form an image, and a drive section for driving the recording element array based on image data. A duty control unit varies the recording duty of the recording elements according to the relative movement speed between the recording element array and the recording medium. In another version, an image forming apparatus has a recording element array including plural recording elements, an image forming unit that effects a relative movement between the recording element array and a recording medium, memory for storing image data, a drive unit for driving the recording element array based on the image data read from the memory and an inhibitor for selectively inhibiting the recording operation by the image read from the memory, according to the relative movement speed between the recording element array and the recording medium. In yet another version, an image forming apparatus has a recording element array including plural recording elements, an image forming unit for causing a relative movement between the recording element array and a recording medium, a smoothing unit for applying a smoothing process to the image data, according to the relative movement speed between the recording element array and the recording medium and drive means for driving the recording element array, based on the image data subjected to the smoothing process by the smoothing unit.

Image forming apparatus and recording control device

This invention relates to a driving control device for a vibration wave motor. A periodic change in frequency of a driving periodic signal is detected during driving of the motor, a frequency corresponding to the detected change is set as a lower limit value, and the driving frequency is controlled not to drop below the lower limit value, thereby preventing the motor from abruptly stopping due to a motor load drift.

Drive device for vibration type motor and image forming apparatus

A unit connector for electrical connection with a main assembly connector provided in a main assembly of an electrophotographic image forming apparatus, includes memory for storing information; a memory connecting portion for electrical connection with said memory when said unit connector is mounted to a unit; an electrical part connecting portion for electrical connection with an electrical part of the unit when said unit connector is mounted to the unit; and a connector connecting portion for electrical connection with the main assembly connector of said apparatus.

Connector unit, process cartridge and electrophotographic image forming apparatus

A vibration control device of a vibration type motor stops motor driving when the actual driving speed, does not come close to a target speed though the frequency of a driving periodic signal is feedback-controlled to the target speed, to prevent an error when the driving circuit fails.

Drive control device of vibration type motor

In a control device for a vibration wave motor, in the case where the device executes an operation involving a large variation in the load while the motor is controlled at a target speed by the driving frequency using a feedback system, such feedback control is inhibited or the response of the feedback control is restricted in order to avoid the drawback resulting from feedback control at the time of generation of the variation in the load.

Drive control method for vibration wave motor, device therefor, and apparatus and image forming apparatus equipped with vibration wave motor

The present invention provides a color image forming apparatus comprising a plurality of color recording heads each having a plurality of recording chips for effecting the recording in response to an image signal. Features of the recording chips attached to the recording head for forming a yellow image differ from features of the recording chips attached to the other color recording heads.

Color image forming apparatus and method for manufacturing recording

In an image determination unit, a possibility that a read image is a predetermined image which is prohibited from an image formation is determined. If the possibility exists, an operation of the image formation is interrupted and whether or not the pertinent image is a predetermined image is determined based on the image information which is continuously inputted. If it is determined that the input image is a specific original, the image formation is suspended, while if not, the image formation processing is restarted.

Image processing apparatus and providing controlling addition of

The present invention provides a multi-function image processing apparatus including a generating device for generating serial-scanned image data which has an overlap portion and a predetermined width and a writing device for writing the image data generated by the generating device in a state where the overlap portion has been deleted in such a manner that the image data is stored in a memory. The apparatus many also include a reading device for reading image data in such a manner that at least a portion of the image data overlaps when the image data having a predetermined width is, by serial scanning, read from the storage device which stores the image data and a processing device for processing the image data which has been read out.

Image processing system in which overlapping image data is deleted from

An image processing apparatus for recording a read image upon a recording medium. If a reading width of an image reading sensor is wider than a recording width of a recording head, the apparatus controls scanning of the image sensor and the recording head. The recording head comprises uniformly aligned recording elements divided into a plurality of groups. Image data read by the image sensor is stored into a memory, then used for activating the recording elements of the recording head. The apparatus conveys a recording medium by a length corresponding to one recording element group at each scanning of the recording head. If the amount of meaningless data or recorded data of the stored data corresponds to the amount of one scanning of the recording head or more, the image sensor performs the next reading.

Apparatus and method for scanned multi-level image recording

An image processor, for example a digital color copier, receives an image signal transmitted in one of a plurality of different modes to process an image of one picture. An analyzer determines the processing mode of the received image signal. A first processor is selected for sequentially processing the image signal for one picture a line at a time in accordance with the analyzer determining one processing mode was received. A second processor is selected and receives the whole image signal for one picture for processing as a block in accordance with the analyzer determining a different mode was received. A processed image is output from the processor selected by the analyzer.

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Numazu, Japan

Toshihiko Otsubo