# US 9,519,256 B2 · Image forming apparatus, image forming method, and storage medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,519,256 B2 - Document ID: US9519256B2 - Status: Granted - Kind: B2 - Application number: 14/946,659 - Filed: 2015-11-19 - Published: 2016-06-02 - Granted: 2016-12-13 - Earliest claimed: 2014-11-28 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Yuichiro Shibuya - Web page: https://patentgrep.com/patent/US9519256B2 ## CPC - G03G 21/00: Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge - G03G 15/5041: {Detecting a toner image, e.g. density, toner coverage, using a test patch (G03G15/553 takes precedence)} - H04N 1/06: using cylindrical picture-bearing surfaces {, i.e. scanning a main-scanning line substantially perpendicular to the axis and lying in a curved cylindrical surface} - G03G 2215/0145: the linear arrangement being vertical - H04N 2201/0094: Multifunctional device, i.e. a device capable of all of reading, reproducing, copying, facsimile transception, file transception - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An image forming apparatus includes a measurement unit configured to measure a density of an image that an image forming unit forms, an acquisition unit configured to acquire an image processing parameter serving as a correction value used to correct the measured density of the image, a generation unit configured to generate a cleaning patch image using the acquired image processing parameter, and a cleaning patch image forming unit configured to form the cleaning patch image generated by the generation unit on an image bearing member, wherein the cleaning patch image is formed during an interval after a first image is formed by the image forming unit on the image bearing member but before a second image having a printing instruction issued subsequent to a printing instruction issued for the first image is formed by the image forming unit on the image bearing member. ## Claims ### Claim 1 An image forming apparatus comprising: a measurement unit configured to measure a density of an image that an image forming unit forms; an acquisition unit configured to acquire an image processing parameter serving as a correction value used to correct the density of the image measured by the measurement unit; a generation unit configured to generate a cleaning patch image using the image processing parameter acquired by the acquisition unit; and a cleaning patch image forming unit configured to form the cleaning patch image generated by the generation unit on an image bearing member, wherein the cleaning patch image is formed during an interval after a first image is formed by the image forming unit on the image bearing member but before a second image having a printing instruction issued subsequent to a printing instruction issued for the first image is formed by the image forming unit on the image bearing member, and wherein if a result of measurement obtained by the measurement unit measuring the density of the image indicates an error, the generation unit interrupts generation of the cleaning patch image. ### Claim 2 (depends on 1) The image forming apparatus according to claim 1, further comprising a cleaning unit configured to remove, using a cleaning blade kept in contact with the image bearing member, toner adhering to the image bearing member caused by the cleaning patch image forming unit forming the cleaning patch image. ### Claim 3 (depends on 1) The image forming apparatus according to claim 1, wherein the acquisition unit acquires the image processing parameter based on a difference between a result of measurement obtained by the measurement unit measuring the density of an image formed by the image forming unit and a target. ### Claim 4 (depends on 1) The image forming apparatus according to claim 1, further comprising a comparison unit configured to make a comparison between a date and time when the measurement unit measured the density of the image and a date and time when the generation unit generated the cleaning patch image, wherein, when the image forming apparatus is started up, if the comparison made by the comparison unit indicates that the date and time when the measurement unit measured the density of the image is earlier than the date and time when the generation unit generated the cleaning patch image, the generation unit generates a cleaning patch image. ### Claim 5 (depends on 1) The image forming apparatus according to claim 1, wherein the generation unit generates the cleaning patch image before print processing is performed by the image processing unit. ### Claim 6 An image forming method comprising: measuring a density of an image that an image forming unit forms; acquiring an image processing parameter serving as a correction value used to correct the measured density of the image; generating a cleaning patch image using the acquired image processing parameter; and forming the generated cleaning patch image on an image bearing member, wherein the cleaning patch image is formed during an interval after a first image is formed by the image forming unit on the image bearing member but before a second image having a printing instruction issued subsequent to a printing instruction issued for the first image is formed by the image forming unit on the image bearing member, and wherein if measuring of the density of the image indicates an error, generation of the cleaning patch image is interrupted. ### Claim 7 A non-transitory computer-readable storage medium storing computer executable instructions that, when executed by a computer, cause the computer to execute a method comprising: measuring a density of an image that an image forming unit forms; acquiring an image processing parameter serving as a correction value used to correct the measured density of the image; generating a cleaning patch image using the acquired image processing parameter; and forming the generated cleaning patch image on an image bearing member, wherein the cleaning patch image is formed during an interval after a first image is formed by the image forming unit on the image bearing member but before a second image having a printing instruction issued subsequent to a printing instruction issued for the first image is formed by the image forming unit on the image bearing member, and wherein if measuring of the density of the image indicates an error, generation of the cleaning patch image is interrupted.