Canon Kabushiki Kaisha

Sumito Tanaka

Tatsuomi Murayama

Sho Ikemoto

Jun Hirabayashi

Hideki Kubo

Isami Itoh

Hiroyuki Eda

Hiroshi Tomii

Toshihisa Yago

Riki Fukuhara

Hiromi Shimura

Megumi Ito

Rumi Konno

Yuga Yamauchi

Tadashi Fukuda

Yuya Ohta

Shin Iwasaki

Yuko Kiyota

Hirohisa Nakajima

Motohiro Fujiwara

Jun Tomine

Masahiro Makino

Kenichi Shibuya

Masahiro Tsujibayashi

Shota Soda

Megumi Uchino

An information processing apparatus, which communicates with an image forming apparatus and a reader, including: a display; and a controller configured to: obtain read image data output from the reader; determine an error of the read image data based on the read image data and reference data; cancel image forming operation of the image forming apparatus in a case where the error is determined in succession a predetermined number of times; cancel reading operation of the reader in the case where the error is determined in succession the predetermined number of times; notify, on the display, the cancellation of the image forming operation and the reading operation in the case where the error is determined in succession the predetermined number of times; and receive a user's instruction information about the predetermined number of times.

Information processing apparatus with automatic detection and interruption of defective image forming operations

An image forming apparatus includes a platen on which an original is to be placed, a feeder configured to feed an original placed on a tray, a sensor configured to detect a sheet on the tray, a lamp provided to the feeder, a reader configured to read the original placed on the platen and to read the original conveyed by the feeder, an image forming unit configured to form an image on a sheet, and a controller. The controller is configured to control the image forming unit to form a test image on a sheet, control the reader to read the test image formed on the sheet placed on the platen, control a density of the image to be formed by the image forming unit based on a reading result of the test image.

Image forming apparatus

An image forming apparatus includes an image processor configured to convert image data based on a first conversion condition; an image forming unit configured to form an image on a sheet based on the image data converted by the image processor, the image forming unit having an image bearing member on which the image is to be formed, a transfer unit configured to transfer the image from the image bearing member onto the sheet, and a fixing unit configured to fix the image to the sheet; a conveyance roller configured to convey the sheet having the image fixed thereto; a reading unit configured to read a pattern image on the sheet conveyed by the conveyance roller; and a detector configured to detect a pattern image on the image bearing member.

An image forming apparatus includes an image forming unit configured to form an image on an image carrier, a transfer unit configured to transfer the image from the image carrier to a sheet, a reader configured to read a pattern image on the sheet while conveying the sheet, a sensor configured to measure a measuring image on the image carrier, and a controller configured to control the image forming unit to form the pattern image and the measuring image while forming images on a plurality of sheets, control the reader to read the pattern image, control the sensor to measure the measuring image, and generate an image forming condition based on a result of reading the pattern image by the reader and a result of measuring the measuring image by the sensor.

An image forming apparatus includes an image forming unit configured to form an image on a sheet; a fixing unit configured to fix the image on the sheet; a reader configured to read a pattern image on the sheet downstream of the fixing unit in a conveying direction in which the sheet is conveyed; and a controller configured to control the image forming unit to form the image and the pattern image on a same sheet, control the fixing unit to fix the image and the pattern image on the same sheet, control the reader to read the pattern image on the same sheet, and control a density of an image to be formed on a sheet subsequent to the same sheet based on a result of reading the pattern image by the reader and reference data.

A controller controls a charging unit to charge a photosensitive member so that a surface potential of the photosensitive member is controlled to a first potential, controls an exposure unit to expose the photosensitive member so that a potential of an exposure region on the photosensitive member is controlled to a second potential, controls a surface potential of a developing sleeve of a developing unit to a third potential, and forms a test image on a sheet by controlling the photosensitive member, the charging unit, the exposure unit, and the developing unit. An absolute value of the first potential is higher than an absolute value of the second potential. An absolute value of the third potential is higher than the absolute value of the first potential.

Image forming apparatus for detecting fault location

In an image forming apparatus including a reader that can read an original and a printer that can form an image on a sheet based on a read result of the reader, a controller can control the printer to form a test chart on the sheet and control the reader to read the test chart. The test chart is used for detecting a causal part of a streak that occurs when an image is formed by the printer. The test chart has a pattern for obscuring an image defect occurring when the test chart is formed by the printer.

Image forming apparatus for detecting causal part of streak occurring at time of image forming

A controller controls a first image forming unit and a second image forming unit to form a test image having a pattern. The test image is formed by the first image forming unit based on a first image forming condition in which an absolute value of a developing potential of a first developing sleeve is greater than an absolute value of a charging potential of a first photosensitive member. The pattern is formed by a second image forming unit based on a second image forming condition in which an absolute value of a developing potential of a second developing sleeve is smaller than an absolute value of a charging potential of a second photosensitive member. A controller controls a sensor to read the test image having the pattern.

An image forming apparatus includes a measuring unit configured to measure a stopping time period in which rotation of a developer carrying member is stopped; a correcting unit configured to control an image forming unit to form a pattern image, control a detecting unit to detect the pattern image, and correct an image formation condition of the image forming unit based on a detection result of the detecting unit; and a correcting unit configured to correct a correction amount of the image formation condition, which is corrected by the correcting unit, based on the stopping time period measured by the measuring unit.

Image forming apparatus effecting correction of image formation characteristics

An image forming apparatus can reduce 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_for correcting a laser output signal value corrected using &#x3b3; correction LUT_. The image forming apparatus performs &#x3b3; correction using LUT_and LUT_for developing colors other than a predetermined low-brightness developing color, whereas for the predetermined low-brightness developing color, it performs &#x3b3; correction using LUT_and laser light amount correction instead of &#x3b3; correction using LUT_

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Tokyo, Japan

Sumito Tanaka