Nec Corporation

Fuji Xerox Co., Ltd.

Hitoshi Takemoto

Yoshihiro Hagiwara

Kazuo Shima

Hitoshi Minemoto

Toru Yakushiji

Junichi Suetsugu

Tadashi Mizoguchi

Tomoya Saeki

Ryosuke Uematsu

Tadashi Mizocuchi

Hiromasa Kanno

Ryousuke Uematsu

Junichi Suetsucu

The image forming device has a recording unit which records an image data line by line while scanning a recording medium with a laser; a memory circuit for storing the image data corresponding to a plurality of lines of the image data; an operation circuit for dividing the image data stored in the memory circuit per line into blocks and generating an image data block having the number of pixels corresponding to an amount of skew with respect to a main scan line direction of the laser from the recording unit; and a control circuit for selecting pixel data from the image data block in corresponding two blocks of the adjacent two lines and combining the image data block and the selected pixel data to produce a line data to be supplied to the recording unit.

Image forming device and recording medium storing program

According to an image data correction conversion circuit and a skew quantity correction method respectively according to the present invention, image data for predetermined lines is stored, the quantity of skew of the stored image data is measured, the number of blocks into which the image data is divided is operated based upon the quantity of the skew and a control signal for correcting and converting the image data based upon the operated data is output. A selector acquires image data the quantity of skew of which is corrected by selecting and outputting the stored image data for predetermined lines according to the control signal.

Correction conversion circuit for converting to image data skew of which is corrected and skew quantity correction method

An information service server, which manages a home page that provides information about an image forming cartridge and a printing apparatus using the image forming cartridge, and a printing system are connected to each other via a network. The printing system includes an image forming cartridge having a nonvolatile memory that stores access information for gaining access to the home page and identification information for identifying the image forming cartridge, identifying means for identifying the image forming cartridge as a genuine product based on the identification information, and access means for gaining access to the home page based on the access information when the image forming cartridge is identified as a genuine product.

Printing system, image forming cartridge, information service system, and information service server

A belt-drive-control circuit comprises a controller for controlling by using servo constants and servo parameters variable in accordance with the variation in load applied to a belt mounted on rollers. The belt-drive-control circuit comprises a LUT (lookup table) which is a memory. The LUT stores the servo constants and servo parameters optimized by experiments and evaluations in accordance with the load applied to the belt which varies between print sequences. A servo controller which is a major component of the belt-drive-control circuit receives a command from a CPU to rotate a belt-driving motor (a DC motor) together with the data on the load applied to the belt. The servo controller reads from the LUT the servo constant and servo parameter corresponding to the received data on the load, computes the computation expression by using the read servo constant and servo parameter, and outputs computed rotational-speed data to a motor-driving-signal converting circuit.

Belt-drive-control circuit and electrophotographic device

A printer belt drive control circuit comprises: an encoder count circuit ( ) for counting output signals from a drive encoder ( ) attached to a drive motor ( ) and from a motor encoder attached to a belt motor ( ), a servo controller which under control of a CPU ( ) and outputs a rotation speed information of the belt motor ( ) according to tan output signal from the encoder count circuit ( ), and a motor drive signal generation circuit for converting an output information from the servo controller ( ) into a form appropriate for an H-bridge driver circuit ( ) which directly drives the belt motor ( )

Printer belt drive control circuit

An ink jet printer has a plurality of ink ejection electrodes for receiving an ejecting voltage to eject an ink droplet, a pulse width generator for specifying the pulse width of each ejecting electrode to obtain a dot diameter of the ink droplet for gray-scale printing. The ejecting voltage Vej for each ejection electrode is divided into a plurality of unit pulses. Each unit pulse is supplied to a corresponding ejection electrode concurrently with unit pulses for other ejection electrodes. A combination of unit pulses for a single ejection electrode forms a single ink droplet having a dot diameter corresponding to the number of unit pulses, thereby achieving accurate gray-scale printing with a reduced circuit scale.

Electrostatic ink jet printer

An inkjet device ensuring reliable and stable ink ejection is disclosed. A plurality of ejection electrodes are arranged in a housing having an ink chamber containing ink including toner particles and a gate electrode plate is placed at a predetermined distance from the ejection electrodes. The gate electrode plate has a slit formed such that the ejection electrodes are directed to the slit and an ink drain coupled to the slit for draining ink from the slit.

Electrostatic inkjet head having an ink drain for draining ink from a slit

An inkjet device having a plurality of ejection electrodes includes a gate electrode plate having a plurality of gate electrodes therein corresponding to the ejection electrodes, respectively. A voltage difference between the ejection electrode and the gate electrode is generated and is changed between a first value and a second value depending on an input signal. The first value is equal to or greater than a threshold value and the second value is smaller than the threshold value. The threshold value is a minimum value which can cause ejection of particulate matter from each ejection electrode.

Inkjet recording apparatus having gate electrodes and print head thereof

An electrostatic ink jet printing head comprises printing electrodes formed on the base film of a substrate. The printing electrodes have insulating coating films which coat the printing electrodes, respectively. Each of the printing electrodes has a main electrode portion formed on the base film and a protruding electrode portion which protrudes from the base film. A covering member covers the main electrode portion. The covering member has an internal surface defining, in cooperation with the main electrode portions and the base film, a ink receiving space which receives ink containing toner particles.

Simple electrostatic ink jet printing head having low cost

An inkjet recording apparatus includes an insulating support member having a major surface on which a plurality of ejection electrodes are formed with each of the ejection electrodes protruding from an ejection end of the insulating support member. Each of the ejection electrodes is coated with an insulating material. Further, a cover member is provided to cover the insulating support member to form ink chambers between them and an opening at an ejection end of the cover member. The ejection portion of each ejection electrode protrudes from the ejection end of the cover member through the opening. The ink is supplied from one ink chamber to the ejection electrodes and flows into the other ink chamber through the ejection electrodes.

Injet recording apparatus

An electrostatic ink jet recorder of the type controlling charged toner particles contained in ink by using electrophoresis is disclosed. The recorder achieves a miniature and cost-effective configuration by reducing the number of drivers for driving ejection electrodes and auxiliary electrodes. The same amount of toner particles is ejected from all of ejection electrodes despite a scatter in the ejection electrode and a scatter in the position of the ejection electrode relative to auxiliary electrodes and a counter electrode.

Electrostatic ink jet recorder having ejection electrodes and auxiliary electrodes divided into groups

An inkjet recording apparatus includes a plurality of ejection electrodes and a counter electrode which are controlled at predetermined intervals such that a first voltage pulse is applied to a selected ejection electrode depending on input data and a second voltage pulse is applied to the counter electrode in synchronization with the first voltage pulse. The first and second voltage pulses produce a voltage difference between the selected ejection electrode and the second electrode, wherein the voltage difference is not smaller than a predetermined threshold voltage which is a minimum value which causes ejection of particulate matter from the selected ejection electrode.

Inkjet recording apparatus

An electrostatic ink jet recording device includes a recording head having an ink chamber receiving therein liquid ink containing electrified toner particles and a plurality of recording electrodes for ejecting the toner particles from the liquid ink. Each of the recording electrodes is applied with a bias pulse train when the recording head resides in a printing area and a non-printing area, and a selected group of the recording electrodes are applied with a constant recording signal for ejection of toner particles. Undesirable ejection of the toner particles in the non-printing area is avoided by the application of the bias pulse train.

Control system for applying biasing and recording signals to recording electrodes of an electrostatic ink jet recording device

Light of a light emitting portion is received by a total of two light receiving portions disposed opposite to each other through a record medium. The surface condition of the record medium is detected corresponding to the amount of light reflected and the amount of light transmitted so as to determine whether the record medium placed is plain paper, coated paper, OHP film, or the like. By controlling the number of heating elements of a heater or turning on/off the heater, an optimum fixing condition is accomplished.

Electrostatic ink jet recording apparatus that adjusts the amount of heat based on the type of recording material

An ink jet recording head comprises a plurality of electrophoretic electrodes corresponding to a plurality of ejecting electrodes, and a pair of stirring electrodes disposed at both ends of the row of the ejecting electrodes. The stirring of the colored particles by the stirring electrodes prevents block of an ink jet slit by the concentrated colored particles, whereas individual control of the electrophoretic electrodes prevents undesirable ink ejection from non-specified ejecting electrode.

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Niigata, Japan

Hitoshi Takemoto