Abstract: A disposable cell counting board in which a space formed by a counting board body and an upper plate is fixed in advance, and which does not require assembling by a cell counting worker, and which can be mass-produced at low costs, is provided. The cell counting board comprises a main body and a cover plate attached to the main body. The main body comprises a planar lands positioned at a lower position by a predetermined distance with respect to the top face of the other part than the lands, a counting sections provided at the lands, and four projection sections in the vicinity of the lands for positioning and fixing the cover plate above the lands. The cover plate has engagement holes formed at locations corresponding to the projection sections. A space of the predetermined distance, 0.1 mm, is generated between the top face of the lands and the bottom face of the cover plate, when the cover plate is attached to the main body by engaging each of the projection sections with the corresponding engagement hole.

Abstract: [Problems] A disposable cell counting board in which a space formed by a counting board body and an upper plate is fixed in advance, and which does not require assembling by a cell counting worker, and which can be mass-produced at low costs, is provided. [Means for Solving Problems] The cell counting board comprises a main body and a cover plate attached to the main body. The main body comprises a planar lands positioned at a lower position by a predetermined distance with respect to the top face of the other part than the lands, a counting sections provided at the lands, and four projection sections in the vicinity of the lands for positioning and fixing the cover plate above the lands. The cover plate has engagement holes formed at locations corresponding to the projection sections. A space of the predetermined distance, 0.

Abstract: An image processing apparatus which includes an image signal input device for outputting a first image signal including at least three signals corresponding to cyan, magenta and yellow, respectively, an image signal converter for converting at least one of the signals included in the first image signal into N (N is an integer greater than one) second image signals corresponding to N inks of different concentrations of a same color family, a black abstraction device for performing black abstraction on each of N second image signals individually to produce a third signal, and a signal processor for performing a UCR processing and black inking processing on the second and third signals to produce fourth signals.

Abstract: An image recording apparatus using a plurality of recording heads that can prevent black lines from occurring at boundaries of each scanning of the recording heads. The total recorded ink volume at the boundaries is positively reduced so that the black lines and the overflow of ink are prevented. The apparatus includes at least a pair of a dark head for discharging relatively dark ink and a light head for discharging relatively light ink, and separates an input image signal into image signals applied to the dark and light heads using at least two tables. The two tables, one for edge nozzles of each recording head and the other for the remaining nozzles, separate the input image signal independently so that the total ink volume discharged from the edge nozzles are limited to a relatively small amount.

Abstract: An image recording apparatus for recording an image in accordance with input image data supplied thereto using a recording head having a plurality of recording elements arranged thereon. The apparatus includes a sensor for detecting and determining non-uniformity of the densities of the records provided by the respective recording elements, at predetermined timing in image recording operations, and adjusting means for adjusting driving signals applied to the respective recording heads in response to an output of sensor.

Abstract: A color image forming apparatus includes an image signal input portion which supplies three image signals C, M and Y associated with cyan, magenta and yellow; an image signal conversion processing portion which converts the image signals C, M and Y into six image signals associated with thick C and thin C, thick M and thin M, and thick Y and thin Y, respectively, by using a thick/thin sorting table; and a color masking processing portion which performs color masking process, and outputs converted six image signals associated with thick C to thin Y. The converted six image signals undergo a black generation process, a UCR process and a black printing process, and a binarization processing thereafter. This makes it possible to produce color images of high quality with high reproducibility even if the hues of N color materials, which belong to the same color family and have different densities, such as thin cyan and thick cyan, differ from each other to some extent.

Abstract: A color image recording apparatus that detects a non-uniformity in recorded pixels of a recorded color image. In the apparatus, a recording device has a plurality of recording units, each of the recording units having a plurality of nozzles which record different pixels, respectively. The plural recording units corresponding to a plurality of different color materials, respectively. The apparatus causes the nozzles of the recording device to form a color image including a plurality of recorded pixels, using a mixture of the plural colors, each of which has a constant density. A detector detects a density non-uniformity in the recorded pixels of the thus recorded color image including a plurality of recorded pixels and has an associated output. A controller controls of the nozzles in accordance with the density non-uniformity detected by the detector.

Abstract: An ink jet recording apparatus performing recording by discharging ink onto a recording medium is provided with a conveying belt for conveying the recording medium by the attraction of static electricity, an electrode provided to be in contact with the recording medium conveyed by the conveying belt, and a power source capable of charging the electrode with the charge which has the polarity opposite to the charge carried by the conveying belt. The main droplet and satellite split from the ink droplet are impacted on the recording medium to prevent the adhesion of the satellite to the discharging port of the discharging surface of the recording head, thus maintaining desirable recording for a long time.

Abstract: An image recording apparatus for recording an image in accordance with input image data supplied thereto using a recording head having a plurality of recording elements arranged thereon. The apparatus includes a sensor for detecting and determining variation the densities of the recordings produced by the respective recording elements, at predetermined timing in image recording operations, and adjusting means for adjusting driving signals applied to the respective recording heads in response to an output of sensor.

Abstract: An image forming apparatus includes reading means for reading the density of a test pattern corresponding to each of plural recording elements of a recording head, the recording elements being arranged in an array, and the test pattern being recorded by the recording elements. An eliminating means eliminates error information, recorded from an area outside a test pattern are, from density information obtained by the reading means when the density of a test pattern end portion corresponding to an end portion of the array of plural of recording elements is determined. A means is provided for uniforming the image densities in correspondence with the plurality of recording elements based on density information from which the error information is eliminated by the eliminating means.

Abstract: An image forming apparatus includes a photosensitive member; an exposing device for emitting a beam of light in accordance with image data for forming an electric image on the photosensitive member; a plurality of developing devices for developing the electric image formed on the photosensitive member; a controller for controlling, for each picture element, duration of the beam of light emitted from the exposing device in response to an image signal; wherein the controller varies, for each picture element, a maximum value of the duration of the beam of light emitted from the exposing device, depending on which developing device is used.

Abstract: There is provided an ink jet recording apparatus such as a bubble jet recording apparatus, comprising: an ink jet recording head in which a plurality of groups each consisting of a plurality of emission ports which are simultaneously driven are continuously arranged; a detector to detect an edge of an input image; and a second driver for sequentially changing the driving order of the groups or sequentially driving the groups which are not neighboring in accordance with the result of the edge detection by the detector. The recording head causes a volume change by an action of a heat energy which is generated from a recording element such as an electrothermal converting element or a thermal resistor element by supplying a pulse-shaped current thereto, thereby emitting an ink droplet from each opening. The recording apparatus uses a plurality of recording elements which are divided into a plurality of blocks and are driven at different timings for every block.

Abstract: An ink jet recording apparatus performing recording by discharging ink from a recording head onto a recording medium. A conveying belt for conveys the recording medium by the attraction of static electricity, an electrode contacts the recording medium conveyed by the conveying belt, and a power source charges the electrode with a charge having a polarity opposite to a charge carried by the conveying belt. The recording head includes a discharge port and a control electrode formed around the discharge port. A voltage identical to the polarity of the surface potential of the recording medium is generated by a power source and applied to the control electrode to cause the control electrode to repel any satellite droplet of the polarity identical to the voltage that splits from a discharged ink droplet during the flight thereof.

Abstract: An image forming apparatus for forming an image on a recording material comprising: a plurality of processing devices for forming the image; a detecter for detecting at least a quantity of state relating to a control of the processing devices; an inference computer for inferring, in accordance with the quantity of state, a quantity of control for use to control the processing devices.

Abstract: A recording apparatus includes an ink jet recording head having plural ejection outlets and thermal energy generating elements provided for the respective ejection outlets; a limiter for defining a using range of the heat generating elements in accordance with image forming conditions, a recording head driver for supplying to the heat generating elements outside the using range defined by the limiter driving signals insufficient to eject the ink and for supplying to the heat generating elements in the using range defined by the limiter a driving signal sufficient to eject the ink in accordance with an image signal.

Abstract: An ink jet recording apparatus wherein an image is formed on a recording material by ejection of coloring agents having different colors from plural recording heads, the apparatus includes a discriminator for discriminating whether an image having a edge and an image having high image density are to be overlaid or not; and a controller, responsive to the discriminator, for reducing the quantity of the coloring agent for the high density image at a position corresponding to at least one of the edge image and a periphery of the edge image .

Abstract: An image forming apparatus having an image carrying member for carrying an electrostatic image, fluororesin has a surface layer containing a fluororesin, and a developing device for developing the electrostatic image on the image carrying member. The image carrying member has a surface layer containing a fluororesin. The developing device has a developer carrying member, which is arranged as opposed to the image carrying member and which carries a developer, and a bias applying device for applying a development bias voltage to the developer carrying member. A period of a waveform of the bias voltage applied by the bias applying device has an oscillating part and a quiescent part.

Abstract: An image recording apparatus includes a recording head in which a plurality of recording elements are arranged so as to form an image on a recording medium, a device for causing the recording head to print a predetermined test pattern, an image density reading device for reading the density of the test pattern formed by the recording head, an uneven image density correction device for correcting conditions for driving the plurality of recording elements in accordance with the result of reading, so as to make even the density of the image, a recording stabilizing device for stabilizing a recording operation performed by the recording head, and a control device for operating the recording stabilizing device before the test pattern is printed and operating the test pattern printing device after the recording head has been stabilized by the recording stabilizing device.

Abstract: An image recording apparatus using a plurality of recording heads that can prevent black lines from occurring at scanning boundaries of the recording heads. The total recorded ink volume at the boundaries is positively reduced so that the black lines and the overflow of ink are prevented. The apparatus includes at least a pair of a dark head for discharging relatively dark ink and a light head for discharging relatively light ink. The apparatus separates an input image signal into image signals applied to the dark and light heads using at least two tables. The two tables, one for edge nozzles of each recording head and the other for the remaining nozzles, separate the input image signal independently so that the total ink volume discharged from the edge nozzles are limited to a relatively small amount.

Abstract: A color image forming method and apparatus in which toner patterns, formed by toners of different colors, on an image bearing member, can be detected by a single sensor. Near-infrared light is emitted from an LED at each formation of a single-colored pattern on the photosensitive drum and the amount of near-infrared light reflected from the drum is detected by the sensor, for the purpose of effecting gradation control.