Patent application number | Description | Published |
20100097666 | COPYING APPARATUS - A copying apparatus detects a non glossy portion (K, M, C, or Y) and a glossy portion (T) of a document based on image data output from a reader unit. The copying apparatus forms an image of the detected non glossy portion (K, M, C, or Y) with a colored toner and an image of the detected glossy portion (T) with a transparent toner, on a sheet, based on the image data output from the reader unit. | 04-22-2010 |
20100309525 | IMAGE FORMING APPARATUS - An image forming apparatus includes: an image bearing member; an image forming unit configured to form a toner image on the image bearing member based on an image input signal; a detection sensor configured to detect a detection image at multiple density levels, which is formed by the image forming unit; a correction unit configured to correct image output characteristics of the image forming unit with respect to the image input signal, based on a detection result of the detection sensor; and a change unit configured to change the density levels at which the detection image is formed so that the detection image is preferentially formed in a density area of a large absolute value of a rate of change of slope of the image output characteristics. | 12-09-2010 |
20110063640 | CALIBRATION PERFORMED IN IMAGE FORMATION APPARATUS TO MAINTAIN IMAGE QUALITY - An image formation apparatus performs calibration to maintain image quality. An adding unit performs addition processing to add an arbitrary type of printing medium different from a printing medium designated in advance as a printing medium usable for the calibration. A storage unit stores characteristic information indicating characteristics of each of a plurality of arbitrary types of printing media added by the adding unit. A determination unit determines an arbitrary type of printing medium relatively approximate to the characteristics of the printing medium designated in advance by comparing the characteristic information of each of the plurality of arbitrary types of printing media with the characteristics of the printing medium designated in advance. A calibration performing unit performs the calibration using the printing medium determined by the determination unit. | 03-17-2011 |
20110164888 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - This invention is to provide a technique of always obtaining a stable output image in image formation using toner. A supplier ( | 07-07-2011 |
20110206395 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - This invention provides an image forming apparatus, which attains a uniform gloss level of an overall image by preventing regions having different gloss levels from being generated on the image to be formed upon execution of image formation using a transparent toner, and a control method thereof. To accomplish this, an image forming apparatus of this invention identifies pixels to be developed using only a black toner of colored toners from an image signal of an image to be formed on a printing material upon execution of image formation using the transparent toner. Furthermore, the image forming apparatus executes exposure control so as to perform development using the transparent toner in an amount required to reduce a gloss level difference between the pixels to be developed using only the black toner and those to be developed using the colored toners other than the black toner. | 08-25-2011 |
20110236045 | IMAGE FORMING APPARATUS - An image forming apparatus includes an image forming portion for forming a toner image of color toner and transparent toner on a recording material; a heating device for heating the toner image formed on the recording material; an execution portion for executing a mode in which the transparent toner is partly placed in an image formable region of the recording material; and a control portion for controlling, on the basis of an amount of the color toner to be placed in an adjacent region adjacent to a region in which the transparent toner is to be placed, an amount of the transparent toner so that the amount of the transparent toner to be partly placed on the recording material when glossiness in the adjacent region is high is larger than that when the glossiness in the adjacent region is low. | 09-29-2011 |
20110279835 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREFOR - This invention provides an image forming apparatus which reduces degradation of the line quality in an output image by a simple method while maintaining the stability of the density characteristics of the output image, and a control method therefor. To accomplish this, in accordance with the amount of change, from a reference density value, of a density value measured from a test pattern image formed on a photosensitive drum, the image forming apparatus according to the invention creates LUT | 11-17-2011 |
20110280594 | IMAGE FORMING APPARATUS CAPABLE OF CORRECTING IMAGE DENSITY PROMPTLY ACCORDING TO CHANGE IN TONER DENSITY, AND METHOD OF CONTROLLING THE IMAGE FORMING APPARATUS - An image forming apparatus capable of correcting image density promptly. A developing device supplies toner to an electrostatic latent image on a photosensitive drum by development contrast potential to form a toner image. An image density sensor detects the density of a patch image on the photosensitive drum. A toner density sensor detects the toner density of developer in the developing device. The amount of toner supplied for replenishment is adjusted when the detected toner density is above a predetermined upper limit value or below a predetermined lower limit value. Further, when the detected patch image density is above a predetermined upper limit value, toner replenishment control is switched to development contrast control to increase image density. When the detected patch image density is below a predetermined lower limit value, the toner replenishment control is switched to the development contrast control to reduce image density. | 11-17-2011 |
20130016988 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOFAANM Tanaka; SumitoAACI TokyoAACO JPAAGP Tanaka; Sumito Tokyo JP - An image forming apparatus and a control method thereof are provided that determine a final contrast potential taking into consideration not only the relationship between the contrast potential of an electrostatic latent image and the density value of a developed image but also a toner charge amount for developing the electrostatic latent image. To accomplish this, the image forming apparatus of the present invention predicts, in advance, the contrast potential of the electrostatic latent image and the density of the toner image at the contrast potential for a predetermined toner charge amount. Furthermore, the image forming apparatus forms an image by adjusting the relationship between the contrast potential and density measured in advance based on a current toner charge amount and a saturation toner charge amount when forming the image. | 01-17-2013 |
20130064561 | APPARATUS FOR FORMING IMAGE ACCORDING TO IMAGE FORMATION CONDITION - An image forming apparatus adjusts a gamma-LUT of a gamma correction circuit in accordance with density data on a measurement image formed on a photosensitive drum. A CPU selects a conversion table in association with the image formation condition such as laser power of a semiconductor laser, fixing temperature of a fixing device, or a charge in a developer. A luminance/density converting portion converts luminance data on the measurement image into density data using the conversion table selected by the CPU. The CPU adjusts a contrast potential and a gamma-LUT using this density data. | 03-14-2013 |
20130089346 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - This invention is to provide a technique of always obtaining a stable output image in image formation using toner. A supplier ( | 04-11-2013 |
20140064749 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - This invention is to provide a technique of always obtaining a stable output image in image formation using toner. A supplier ( | 03-06-2014 |
20140255052 | IMAGE FORMING APPARATUS - An image forming apparatus according to an embodiment of the present invention performs, at a predetermined timing, first gradation correction including forming a patch image on an image carrier, and correcting gradation characteristics of a formed image using a correction amount corresponding to the result of measurement of the patch image. The image forming apparatus further performs, at a predetermined frequency, second gradation correction including correcting the light power of laser light output from an exposure apparatus based on the result of detection or estimation of the charge amount of toner used in image formation, and correcting gradation characteristics using a correction amount corresponding to the result of the detection or estimation of the toner charge amount. | 09-11-2014 |