# US 11,442,387 B2 · Image forming apparatus determining states of members, image forming method, and image forming system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,442,387 B2 - Document ID: US11442387B2 - Status: Granted - Kind: B2 - Application number: 17/144,521 - Filed: 2021-01-08 - Published: 2021-05-06 - Granted: 2022-09-13 - Earliest claimed: 2019-03-26 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Yohei Suzuki; Junya Azami; Seiji Hara; Atsunobu Mori; Masafumi Monde; Tatsuya Hotogi; Hirotaka Shiomichi - Web page: https://patentgrep.com/patent/US11442387B2 ## CPC - G03G 15/5029: {by measuring the copy material characteristics, e.g. weight, thickness} - G03G 15/5062: {by measuring the characteristics of an image on the copy material} - G03G 15/55: {Self-diagnostics; Malfunction or lifetime display} - G03G 15/553: {Monitoring or warning means for exhaustion or lifetime end of consumables, e.g. indication of insufficient copy sheet quantity for a job} - G03G 2215/00637: Acoustic detector - G03G 2215/00717: Detection of physical properties - G03G 2215/00742: of sheet weight - G03G 2215/00751: of sheet type, e.g. OHP - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract An image forming apparatus includes a plurality of members for forming an image; a transmitting unit configured to transmit a sonic wave; a receiving unit configured to receive a first sonic wave that has been transmitted from the transmitting unit and has passed through a sheet and a second sonic wave that is generated from at least one of the plurality of members; a detection unit configured to detect information regarding a type or state of the sheet based on the first sonic wave; and a determination unit configured to determine a state of a member that has generated the second sonic wave based on the second sonic wave. ## Claims ### Claim 1 A sensor unit attachable to an image forming apparatus, comprising: a transmitting member configured to transmit a first sonic wave; a receiving member configured to receive the first sonic wave that has been transmitted from the transmitting member and has passed through a recording material, and a second sonic wave that is generated when the image forming apparatus operates for forming an image on the recording material, wherein the receiving member is configured to receive the first sonic wave and the second sonic wave in a state in which the sensor unit is attached to the image forming apparatus; and a control unit configured to output a first signal, in a first mode, according to the first sonic wave that is received by the receiving member, and to output a second signal, in a second mode, according to the second sonic wave that is received by the receiving member. ### Claim 2 (depends on 1) The sensor unit according to claim 1, wherein the control unit includes a filter to extract a target sound wave from a signal output by the receiving member, and is configured to output a signal filtered by the filter as the second signal in the second mode. ### Claim 3 (depends on 2) The sensor unit according to claim 2, wherein the control unit includes a plurality of filters, and is configured to select the filter to be used among the plurality of filters according to the target sound wave. ### Claim 4 (depends on 1) The sensor unit according to claim 1, wherein the control unit includes an amplifier to amplify a level of a signal output by the receiving unit, and is configured to output a signal amplified by the amplifier with a first amplification factor as the first signal in the first mode and output a signal amplified by the amplifier with a second amplification factor as the second signal in the second mode, and the second amplification factor is less than the first amplification factor. ### Claim 5 (depends on 1) The sensor unit according to claim 1, wherein the transmitting member does not transmit the first sonic wave in the second mode. ### Claim 6 (depends on 1) The sensor unit according to claim 1, wherein the first sonic wave is an ultrasonic wave and the second sonic wave is an audible sound wave. ### Claim 7 (depends on 1) The sensor unit according to claim 1, wherein the receiving member comprises a MEMS microphone, wherein the MEMS microphone includes: a vibrating membrane that vibrates in accordance with a received sonic wave; and an electrode that is provided so as to oppose the vibrating membrane, and outputs a signal corresponding to a vibrating state of the vibrating membrane, and wherein the MEMS microphone converts a change in capacitance of a capacitor formed by the vibrating membrane and the electrode to an electric signal. ### Claim 8 (depends on 1) The sensor unit according to claim 1, wherein, in the state in which the sensor unit is attached to the image forming apparatus, the first signal is used for detecting information regarding a type or state of the recording material. ### Claim 9 (depends on 1) The sensor unit according to claim 1, wherein, in the state in which the sensor unit is attached to the image forming apparatus, the second signal is transmitted to a processing system which is connected with the image forming apparatus via a network. ### Claim 10 An image forming apparatus comprising: a transmitting member configured to transmit a first sonic wave; a receiving member configured to receive the first sonic wave that has been transmitted from the transmitting member and has passed through a recording material, and a second sonic wave that is generated when the image forming apparatus operates for forming an image on the recording material; a detection unit configured to detect information regarding a type or state of the recording material based on the first sonic wave received by the receiving member; and an information transmitting unit configured to transmit information related to the second sonic wave received by the receiving member to a processing system which is connected with the image forming apparatus via a network. ### Claim 11 (depends on 10) The image forming apparatus according to claim 10, wherein the detection unit detects a basis weight of the recording material as the type of the recording material. ### Claim 12 (depends on 10) The image forming apparatus according to claim 10, wherein the detection unit detects a double feed of the recording material as the state of the recording material. ### Claim 13 (depends on 10) The image forming apparatus according to claim 10, wherein the first sonic wave is an ultrasonic wave and the second sonic wave is an audible sound wave. ### Claim 14 (depends on 10) The image forming apparatus according to claim 10, wherein the receiving member comprises a MEMS microphone, wherein the MEMS microphone includes: a vibrating membrane that vibrates in accordance with a received sonic wave; and an electrode that is provided so as to oppose the vibrating membrane, and outputs a signal corresponding to a vibrating state of the vibrating membrane, and wherein the MEMS microphone converts a change in capacitance of a capacitor formed by the vibrating membrane and the electrode to an electric signal.