Canon Kabushiki Kaisha

Keizo Takura

Takahiro Nakase

Atsushi Hori

Tsuyoshi Kunishi

Hayato Negishi

Hiroyuki Kidaka

Takeo Yamamoto

Hisataka Hisakuni

Koji Arimura

Makoto Oki

Hisaaki Senba, Deceased

Mitsuka Abe

An image forming apparatus includes an image forming unit configured to form an image, a reader having a transparent member, the reader being configured to read an original through intermediation of the transparent member, a document feeder configured to feed the original in order to read the original by the reader, a reader image processor, and a controller. The controller is configured to control the image forming unit to form a test chart on a sheet, to control the reader image processor to detect the dust on the transparent member based on a result of reading the test chart, and to generate a conversion condition based on other signal values excluding an abnormal signal value caused by the dust on the transparent member.

Image forming apparatus

An image forming apparatus includes: a correction unit correcting image data based on a correction condition; an image forming unit forming an image based on the corrected image data; a transfer unit transferring the image onto a sheet; a measuring unit measuring a measuring image on an image bearing member; a converting unit converting a measurement result of the measuring image, based on a conversion condition; a first generating unit generating the correction condition based on the converted measurement result; an acquiring unit acquiring a measurement result of a test image formed on the image bearing member; a controller forming a test image on the sheet; a receiving unit receiving instruction from a user comparison of a sample image and the test image transferred on the sheet; and a second generating unit generating the conversion condition, based on the instruction and the acquired measurement result of the test image.

Image forming apparatus that generates conversion condition of a measuring unit, and control method of the image forming apparatus

An image forming apparatus comprising: a controller controlling an image forming unit to form a test image, controlling a measurement unit to measure the test image on an image bearing member, and controlling a transfer unit to transfer the test image formed on the image bearing member to the sheet; a reception unit receiving a user instruction; and a second generation unit generating the conversion condition based on the user instruction and the measurement result of the test image, wherein the test image includes a first test image, a second test image, and an image indicating a position where the sheet is to be bent, and in a case where the sheet is bent along the position, a position of the first test image and a position of the second test image do not overlap with each other.

Image forming apparatus generating conversion condition of measurement unit and method for controlling the same

An image forming apparatus comprises: a detection unit which detects a light amount of reflected light from a measurement image, and includes an irradiation unit which irradiates the measurement image with light, a first unit which receives specular light from the measurement image, and a second unit which receives diffused light from the measurement image; a controller which controls an image forming condition based on a detection result; and a determination unit which determines a first emission intensity based on a light amount of the specular light, and determines a second emission intensity based on the first emission intensity, the light amount of the specular light, and a light amount of the diffused light, wherein the emission intensity of light with which the irradiation unit irradiates the measurement image is controlled based on the second emission intensity.

An image forming apparatus includes a control unit configured to cause an image forming unit to form an adjustment image on an image bearing member, and a detection unit configured to detect the adjustment image, wherein the control unit controls gradation for forming an image by the image forming unit based on a detection result provided by the detection unit, and wherein, when causing the image forming unit to form a first adjustment image on the image bearing member at a photosensitive member and to subsequently form a second adjustment image that is different from the first adjustment image, the control unit causes the image forming unit to form the second adjustment image at a position different from a position for forming the first adjustment image in a longitudinal direction of the photosensitive member.

An image forming apparatus includes an image bearing member that bears a toner image; an intermediate transferring material; a transferring unit that transfers a toner image on the image bearing member to the intermediate transferring material; a bias applying unit that applies a bias to the transferring unit; a cleaning unit that contacts and cleans the surface of the image bearing member; a toner supplying unit that, when an image is not being formed, passes a toner image for supply that is formed on the image bearing member through a transferring position to supply the toner image for supply to the cleaning unit; and a switching unit that switches from a state in which the power supply portion is electrically connected to the bias applying unit to a state in which a resistance value between the power supply portion and a ground is 100 M&#x3a9; or more.

Image forming apparatus supplying toner efficiently to cleaning means cleaning surface of image bearing member

There is disclosed an image processing device for performing a conversion processing of image data, comprises an input unit for inputting image data, an enlargement/reduction magnification setting unit for setting an enlargement/reduction magnification of the image data inputted by the input unit, a data converting unit having a plurality of image data conversion tables and using one selected conversion table to convert the inputted image data to output data, and a table selecting unit for selecting the conversion table in accordance with the enlargement/reduction magnification set by the enlargement/reduction magnification setting unit. In the enlargement/output of the image by the image processing, the edge portion of output image can be prevented from being blurred by the enlargement processing. Moreover, in the reduction/output of the image, even when the reduction processing is performed, the reproducibility of intermediate gradation density fine lines in the input image can be enhanced.

Image processing device and image processing method

An image forming apparatus includes a photosensitive body, a charging member for charging the photosensitive body, voltage applicator for applying a voltage including an AC component to the charging member, exposing device for image exposing on the photosensitive body charged by the charging member to form an electrostatic image, and developer for developing the electrostatic image, wherein the image forming apparatus can select from a first mode having low tone reproductivity and a second mode having tone reproductivity higher than that of the first mode, and wherein, when the second mode is selected, the voltage applicator applies a voltage having a frequency of the AC component higher than that when the first mode is selected.

Image forming apparatus having a charging member with plural charging

A developing device is constructed by a developing unit for developing an electrostatic latent image on an image holding member, a developing agent containing unit for containing a developing agent which is supplied to the developing unit, an agitator, provided in the developing agent containing unit, for agitating the developing agent, a detecting sensor for detecting a residual amount of developing agent in the developing agent containing unit, and a determining device for determining the residual amount of developing agent at a plurality of levels on the basis of an output state of the detecting sensor in a predetermined time range. The determining device determines the residual amount of developing agent on the basis of a ratio of an output time of a developing agent presence state of the detecting sensor and an output time of a developing agent absence state in the predetermined time range. When a ratio at which the output time of the developing agent presence state of the detecting sensor occupies in the predetermined time range is equal to or less than a predetermined value, the determining device determines that the residual amount of developing agent is small, and when the ratio is substantially equal to 0, the determining device determines the absence of developing agent.

Developing device having a residual toner amount discrimination feature

An image forming apparatus includes an image bearing member; a charging member contactable the image bearing member to charge the image bearing member at a charging position; wherein an AC current applied to the charging member is constant-current-controlled when a region of the image bearing member which is going to be an image formation region is at the charging position, and wherein a current flowing through the charging member is detected when a region of the image bearing member which is going to be a non-image-formation region is at the charging position, and the AC current is determined on the basis of the detected current.

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Tokyo, Japan

Keizo Takura