Fuji Xerox Co., Ltd.

Nippon Light Metal Company, Ltd.

Nikkei Techno-Research Co. Ltd.

Kazuo Asano

Koji Masuda

Yuji Suemitsu

Toru Misaizu

Takeshi Saito

Shigeru Arai

Akinori Komura

Kouta Matsuo

Takashi Nagao

Akinori Ono

Toshio Masubuchi

Ken Ebihara

Masashi Ogasawara

Takuo Kusano

Keiji Muraki

An image processor has: a unit that executes a conversion process on input image data represented by pixels of M grayscales (M&#x2267;3), to convert the input data into output image data represented by sub-pixels of two grayscales; and a unit that outputs the output data, wherein the conversion process includes: a process to determine a filling pattern of sub-pixels corresponding to a pixel of interest of the input data according to a corrected grayscale value obtained by adding a correction value to a grayscale value of the pixel of interest; and the pattern includes a core pattern which forms a core of a dot and a growth pattern which grows a dot, the correction value includes a diffused error, and at least a part of the diffused error obtained by weighting an error of a pixel determined as the core pattern is not included in the correction value.

Image processor, image-processing method, and computer-readable medium

An image processing apparatus includes: an acceptance section; an edge detection section; and a screen processing section, wherein the edge detection section includes: a first edge determination section that subjects a pixel of interest to edge determination by reference to information about a density of the pixel of interest and information about densities of pixels around the pixel of interest determined by an edge detection window; and a second edge determination section that compares minimum density information among the information about densities of pixels determined by the edge detection window with a predetermined background threshold value, and that redetermines the pixel of interest, which is determined to belong to an edge portion by the first edge determination section, as belonging to anon-edge portion in cases where the minimum density is equal to or greater than the background threshold value.

Image processing apparatus, image forming apparatus, and image processing method for edge detection processing and determination

An image processor includes: a gradation value acquisition unit that acquires a gradation value of a pixel of interest which is a pixel sequentially selected as a target of a binarization process from input image data represented by pixels of M gradations, wherein M&#x2267;3; and a pattern determination unit that determines a filling pattern of a group of pixels of output image data corresponding to the pixel of interest according to a corrected gradation value acquired by adding, to the gradation value of the pixel of interest, an error value diffused from a pixel at a periphery of the pixel of interest, wherein the filling pattern includes at least a first pattern in which a predetermined plurality of pixels are filled and which forms a core of a dot and a third pattern in which substantially no pixel is filled and the pattern determination unit determines the filling pattern to be one of the first pattern and the third pattern according to a size relationship between the corrected gradation value and a predetermined threshold value which spatially varies in a periodic manner.

Image processor, image formation device, image processing method, and computer-readable medium

An image processing apparatus includes a receiving section, an edge detection section and a screen processing section. The receiving section receives image information. The edge detection section detects an edge area from the image information received by the receiving section. The screen processing section performs a screen process, which is based on area coverage modulation, for the image information on a basis of the detection result by the edge detection section. The screen processing section performs a screen process for the edge area detected by the edge detection section with (i) a screen angle, which is equal to that of a screen process performed for a non-edge area other than the edge area, and (ii) a number of lines per inch, which is an integer multiple of that of the screen process performed for the non-edge area.

Image processing apparatus and method for generating an image signal for gradation

An image processing apparatus, has: a conversion unit that converts input image information including a first color component and a second color component into output image information in which, with regard to each of the color components, the number of gray levels per pixel is smaller than the number of gray levels per pixel in the input image information and a gray level of the input image information is expressed by a gray level value of each pixel and a dot density and in which the size of a dot is different between the first color component and the second color component; and an output unit that outputs the output image information obtained by the conversion unit.

Image processing apparatus, image processing method multicolor image forming apparatus, computer-readable medium, and computer data signal

An image formation apparatus has a photoreceptor , a charger , a latent image write unit , a developing device , and a performance maintaining controller , wherein the performance maintaining controller executes a performance maintaining initial sequence A for agitating and charging a developer G uniformly to such a degree that aggregating of the developer G in the developing device is at least eliminated under the condition that the image formation apparatus is first used and also executes a performance maintaining sequence B for uniformly agitating and charging the developer G in the developing device at least based on elapsed time since the immediately preceding image formation mode.

Image formation apparatus

The present invention provides a recording head for electrostatic recording having a plurality of lower electrodes and a plurality of upper electrodes constituting a matrix with an insulating layer interposed therebetween and a space for ion generation where corona discharge is caused by applying a voltage between the lower and upper electrodes characterized in that a plurality of short partial recording heads are formed by integrally firing the lower electrodes, insulating layer and upper electrodes and are joined to provide a recording head of a desired length.

Method of manufacturing a recording head for electrostatic recording

It is an object of the invention to provide a dielectric drum where manufacturing costs can be reduced while keeping pressure resistance high and having an anodic oxidized film with a uniform dielectric characteristic, and also to provide an electrostatic recording device which is inexpensive and provides a high image reliability using the dielectric drum. According to the present invention, a dielectric drum includes an aluminum substrate and a dielectric layer of an anodic oxidized film on the surface of the aluminum substrate. The aluminum substrate is produced by conducting a drawing and hardening treatment M on an aluminum alloy pipe of the 5000 series alloys of the Aluminum Association. Also, the dielectric drum is used to construct an electrostatic recording device. The electrostatic recording device includes toner image forming means for forming a toner image on a dielectric drum, and pressure applying means for transferring by pressure or transferring and fixing by pressure the toner image on the dielectric drum to a member to be transferred.

Dielectric drum and electrostatic recording device using the same

A latent electrostatic image is formed on a rotatable latent image carrying body in a matrix form by an electrostatic recording head. An encoder outputs a pulse signal having a period which reflects a rotational speed of the latent image carrying body. A timing signal to be used for driving the recording head is generated based on the pulse signal and control information which has been produced based on the pulse signal and indicates a proper drive period of the timing signal. In another method, the period of the pulse signal is corrected so as to become consistent with a pitch, in the rotational direction of the latent image carrying body, of matrix elements of the recording head. The timing signal is generated based on the corrected pulse signal.

Electrostatic recording method and apparatus with recording head timing

An electrostatic latent image forming device has at least two electrodes with an insulating layer formed between the two electrodes. The electrodes are arranged in a matrix array. One set of electrodes has space regions formed in the electrodes in which creeping corona discharge occurs when a voltage is applied to those electrodes. The insulating layer between the electrodes is formed of a ceramic material. A third electrode is used to draw the ions out of the apertures of the electrodes. A ceramic insulating layer is placed between the electrodes with the apertures and the third electrode.

Process for forming an ion producing device

Electrostatic latent image forming device having a ceramic insulating

Electrostatic latent image forming device includes a first insulating base plate, a plurality of first electrodes and a plurality of second electrodes disposed to form a matrix with a second insulating base plate interposed therebetween. Each of the second electrodes has a space area where a creeping corona discharge is caused to occur by applying a voltage between the first and second electrodes. The second insulating base plate is supported by the first insulating base plate. In the electrostatic latent image forming device, through holes are formed in the first insulating base plate, and conductors in conduction to the first and second electrodes are filled into the through holes. Connecting parts in conduction to the conductors are provided on the back surface of the first insulating base plate to apply voltages to the first and second electrodes through the conductors.

Electrostatic latent image forming device with integral feeder terminal

In an electrostatic latent image forming apparatus used in a printer, a facsimile machine or the like, there is added an insulating member between the conventional screen electrode and the latent image bearing body to allow the derived-ion beam to be squeezed down and the separation from the latent image bearing body to be reduced without the danger of a damaging discharge toward that body. The control area provided in apertures of the additional insulating member enables control of the direction of the derived ions so that the squeezing yields improved resolution and efficiency for high-density recording. The position of the additional insulating member is sufficient to inhibit damaging discharge, even when the screen electrode and latent image bearing body are very close to each other.

Electrostatic latent image forming apparatus controlling the direction

A discharge head for electrostatically recording an image on a recording body including a first insulation layer having a first side and a second side, a plurality of linear extending discharge electrodes disposed on the first side, an induction electrode disposed on the second side, and a second insulation layer disposed to cover all but the tips of the discharge electrodes. The discharge head may also include a insulating substrate layer laminated on the side of the induction electrode opposite the first insulation layer. In addition, the induction electrode may contain a plurality of spaced apart protrusions extending in a direction parallel to the discharge electrodes.

Growing community of inventors

Kanagawa, Japan

Kazuo Asano