# US 2019/0376891 A1 · Determination apparatus for determining type of recording medium and image forming apparatus using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0376891 A1 - Document ID: US20190376891A1 - Status: Published application - Kind: A1 - Application number: 16/548,755 - Filed: 2019-08-22 - Published: 2019-12-12 - Earliest claimed: 2014-11-27 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Teruhiko Namiki; Tsutomu Ishida; Masafumi Monde; Takuya Shono - Web page: https://patentgrep.com/patent/US20190376891A1 ## CPC - G01N 21/55: Specular reflectivity - B41J 11/009: {Detecting type of paper, e.g. by automatic reading of a code that is printed on a paper package or on a paper roll or by sensing the grade of translucency of the paper} - G01N 29/11: by measuring attenuation of acoustic waves - G01N 29/4427: {with stored values, e.g. threshold values} - G03G 15/5029: {by measuring the copy material characteristics, e.g. weight, thickness} - G01N 2201/1214: for humidity - G01N 2291/0237: Thin materials, e.g. paper, membranes, thin films - G01N 2291/048: Transmission, i.e. analysed material between transmitter and receiver - G03G 2215/00776: of humidity or moisture influencing copy sheet handling - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract An apparatus for determining a type of a recording medium is provided. A detection unit detects a characteristic value indicating a physical characteristic of a recording medium. A measurement unit measures a moisture content correlated with a moisture content of the recording medium. A determination unit determines the type of the recording medium based on the moisture content and the characteristic value. The determination unit may correct the characteristic value using the moisture content or correct a rule for determining the type of the recording medium using the moisture content unit, and determines the type of the recording medium in accordance with the corrected characteristic value or the corrected rule. ## Claims ### Claim at position 1 -17. (canceled) ### Claim 18 An apparatus for determining a type of a recording medium, comprising: a detection unit including: a transmission unit configured to transmit ultrasonic waves toward the recording medium, and a reception unit configured to receive ultrasonic waves that were transmitted from the transmission unit and passed through the recording medium, the detection unit configured to detect a characteristic value indicating a physical characteristic of a recording medium; a measurement unit configured to measure information regarding a moisture content contained in the recording medium; and a control unit configured to determine the type of the recording medium based on the information measured by the measurement unit and the characteristic value detected by the detection unit. ### Claim 19 (depends on 18) The apparatus according to claim 18, further comprising: a correction unit configured to correct the characteristic value detected by the detection unit using the information measured by the measurement unit, and wherein the control unit determines the type of the recording medium based on the characteristic value corrected by the correction unit. ### Claim 20 (depends on 19) The apparatus according to claim 19, wherein the detection unit detects the characteristic value indicating a grammage of the recording medium. ### Claim 21 (depends on 20) The apparatus according to claim 20, further comprising: a signal processing unit configured to output the characteristic value that is in accordance with an amplitude value of a reception signal output by the reception unit upon receiving the ultrasonic waves. ### Claim 22 (depends on 20) The apparatus according to claim 20, wherein the correction unit is further configured to: in a case where it is determined based on the information measured by the measurement unit that the moisture content contained in the recording medium is more than a predetermined amount, correct the characteristic value detected by the detection unit such that the grammage of the recording medium is reduced, and in a case where it is determined based on the information measured by the measurement unit that the moisture content contained in the recording medium is less than or equal to the predetermined amount, correct the characteristic value detected by the detection unit such that the grammage of the recording medium is increased. ### Claim 23 (depends on 18) The apparatus according to claim 18, further comprising: a correction unit configured to correct one or more threshold values for determining the type of the recording medium using the information measured by the measurement unit, and wherein the determination unit determines the type of the recording medium by comparing the characteristic value detected by the detection unit and the one or more threshold values corrected by the correction unit. ### Claim 24 (depends on 18) The apparatus according to claim 18, wherein the measurement unit includes: a sensor configured to detect a temperature and a humidity, and wherein the measurement unit obtains a moisture content of a space around the recording medium based on the temperature and the humidity detected by the sensor. ### Claim 25 (depends on 24) The apparatus according to claim 24, wherein the sensor is provided in a periphery of a conveyance path for the recording medium or a housing unit configured to accommodate the recording medium. ### Claim 26 (depends on 24) The apparatus according to claim 24, further comprising: an intake type or exhaust type cooling unit, wherein the sensor is provided in a periphery of the cooling unit. ### Claim 27 (depends on 24) The apparatus according to claim 24, wherein the sensor is provided at a position separated from a heat source by a predetermined distance or more. ### Claim 28 An image forming apparatus comprising: an image forming unit configure to form an image; a detection unit including: a transmission unit configured to transmit ultrasonic waves toward the recording medium, and a reception unit configured to receive ultrasonic waves that were transmitted from the transmission unit and passed through the recording medium, the detection unit being configured to detect a characteristic value indicating a physical characteristic of a recording medium; a measurement unit configured to measure information regarding a moisture content contained in the recording medium; and a control unit configured to control an image forming condition of the image forming unit, wherein the control unit control the image forming condition of the image forming unit based on the information measured by the measurement unit and the characteristic value detected by the detection unit.