# US 8,783,811 B2 · Printing apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,783,811 B2 - Document ID: US8783811B2 - Status: Granted - Kind: B2 - Application number: 13/557,069 - Filed: 2012-07-24 - Published: 2013-01-31 - Granted: 2014-07-22 - Earliest claimed: 2011-07-29 - Assignees: Canon Kabushiki Kaisha - Applicants: Masaki Nitta; Satoshi Hayashi; Taku Yokozawa; Hiroaki Shirakawa; Yuhei Oikawa; Yosuke Ishii - Inventors: Masaki Nitta; Satoshi Hayashi; Taku Yokozawa; Hiroaki Shirakawa; Yuhei Oikawa; Yosuke Ishii - Web page: https://patentgrep.com/patent/US8783811B2 ## CPC - B41J 2/04513: {for increasing lifetime} - B41J 2/04515: {preventing overheating} - B41J 2/04546: {Multiplexing} - B41J 2/04563: {detecting head temperature; Ink temperature} - B41J 2/0458: {controlling heads based on heating elements forming bubbles} - B41J 2/2132: {Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding (methods for local corrections by dot omission, image edge enhancement, or multi-pass mask selection G06K15/102; colour conversion H04N1/40)} - B41J 11/00214: {using UV radiation} - B41J 11/00216: {using infrared [IR] radiation or microwaves} - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS ## Abstract A printing apparatus, which includes a heating unit for heating a recording medium during printing, determines a pass number for multi-pass printing based on acquired information relating to the duty in each of a plurality of regions in one band of print region. The printing apparatus sets an amount of heat of the heating unit based on the acquired information. ## Claims ### Claim 1 A printing apparatus comprising: a printing unit, having a carriage and a print head mounted on the carriage, configured to print an image by applying ink on a recording medium while repeating movement of the carriage to record one band of print region to perform multi-pass printing; a heating unit configured to apply heat onto the recording medium during printing to dry the ink, wherein the heating unit is provided above an area where the carriage moves reciprocally, and applies the heat in the area; an acquisition unit configured to acquire information relating to duty in each of a plurality of regions divided within one band of print region; and a determination unit configured to determine a number of print passes based on the information acquired by the acquisition unit, wherein the multi-pass printing is performed based on the number of print passes determined by the determination unit. ### Claim 2 (depends on 1) The printing apparatus according to claim 1, further comprising a setting unit configured to set an amount of heat of the heating unit based on the information acquired by the acquisition unit. ### Claim 3 (depends on 2) The printing apparatus according to claim 2, wherein the information is a difference between a maximum duty and a minimum duty among the plurality of regions in subject to one print pass, wherein the determination unit is configured to set the number of print passes so that the difference between the maximum duty and the minimum duty is less than a threshold, and wherein the setting unit is configured to set the heating unit so that a surface temperature of the recording medium becomes a temperature suitable for the maximum duty. ### Claim 4 (depends on 2) The printing apparatus according to claim 2, wherein the information is a maximum duty and a minimum duty among the plurality of regions subject to one print pass, wherein the determination unit is configured to set the number of print passes so that the minimum duty is greater than or equal to a first threshold and the maximum duty is less than a second threshold, and wherein the setting unit is configured to set the amount of heat of the heating unit so that a surface temperature of the recording medium becomes a temperature suitable for the maximum duty. ### Claim 5 (depends on 1) The printing apparatus according to claim 1, further comprising a second heater arranged downstream of the heating unit, wherein the second heater applies higher energy onto the recording medium than that of the heating unit. ### Claim 6 (depends on 1) The printing apparatus according to claim 1, wherein each of the plurality of regions is divided at equal intervals based on a period that would be expected when the recording medium is deformed into a periodic ripple-like shape due to excessive heating. ### Claim 7 (depends on 1) The printing apparatus according to claim 1, wherein the recording medium is a recording medium that does not have an ink reception layer, and wherein the ink includes polymer emulsion. ### Claim 8 A printing apparatus comprising: a printing unit, having a carriage and a print head mounted on the carriage, configured to print an image by applying ink on a recording medium while repeating movement of the carriage to record one band of print region; a heating unit configured to apply heat onto the recording medium during printing to dry the ink, wherein the heating unit is provided above an area where the carriage moves reciprocally, and applies the heat in the area; an acquisition unit configured to acquire a maximum duty among a plurality of regions divided within one band of print region; and a setting unit configured to set an amount of heat of the heating unit so that a surface temperature of the recording medium becomes a temperature suitable for the maximum duty. ### Claim 9 (depends on 8) The printing apparatus according to claim 8, further comprising a second heater arranged downstream of the heating unit, wherein the second heater applies higher energy onto the recording medium than that of the heating unit. ### Claim 10 (depends on 8) The printing apparatus according to claim 8, wherein each of the plurality of regions is divided at equal intervals based on a period that would be expected when the recording medium is deformed into a periodic ripple-like shape due to excessive heating. ### Claim 11 (depends on 8) The printing apparatus according to claim 8, wherein the recording medium is a recording medium that does not have an ink reception layer, and wherein the ink includes polymer emulsion.