# US 6,719,395 B2 · Recording apparatus and temperature detecting method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,719,395 B2 - Document ID: US6719395B2 - Status: Granted - Kind: B2 - Application number: 09/978,458 - Filed: 2001-10-15 - Published: 2002-04-11 - Granted: 2004-04-13 - Earliest claimed: 1993-08-31 - Assignees: Canon Kabushiki Kaisha - Inventors: Osamu Iwasaki; Naoji Otsuka; Atsushi Arai; Kentaro Yano; Kiichiro Takahashi; Daigoro Kanematsu - Web page: https://patentgrep.com/patent/US6719395B2 ## CPC - B41J 2/04515: {preventing overheating} - B41J 2/0454: {involving calculation of temperature} - B41J 2/04553: {detecting ambient temperature} - B41J 2/0458: {controlling heads based on heating elements forming bubbles} - B41J 2/195: for monitoring ink quality - B41J 29/38: Drives, motors, controls or automatic cut-off devices for the entire printing mechanism - B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS ## Abstract In a recording apparatus for effecting recording with a recording head on a recording medium, a temperature detector provided on a control circuit board of the recording apparatus detects a temperature at the board, and a timer measures a first activation time of electric power supply to the control circuit board for a control not involving a recording operation. The timing of reading the temperature detected by the temperature detector, as well as a correction value for the thus read value, are determined according to the first activation time measured by the timer. ## Claims ### Claim 1 A recording apparatus for effecting recording with a recording head on a recording medium, comprising: a temperature detector provided on a control circuit board of said recording apparatus and adapted to detect a surrounding temperature at a position of the control circuit board; a timer adapted to measure a first activation time of electric power supply to the control circuit board for a control not involving control of a recording operation; and a determination unit adapted to determine a timing of reading the surrounding temperature detected by said temperature detector and adapted to determine a correction value for correcting a thus read value, according to the first activation time measured by said timer. ### Claim 2 (depends on 1) A recording apparatus according to claim 1, wherein said timer is constructed to measure, after electric power supply to the control circuit board for a control involving control of a recording operation, a second activation time of electric power supply to the control circuit board for a control not involving the control of the recording operation; and wherein said determination unit is constructed to determine the timing of reading the surrounding temperature detected by said temperature detector and is constructed to determine a correction value for correcting a thus read value, according to the second activation time. ### Claim 3 (depends on 2) A recording apparatus according to claim 2, wherein said correction value is not selected as zero only if said second activation time is equal to or longer than a predetermined time. ### Claim 4 (depends on 3) A recording apparatus according to claim 3, wherein the predetermined time is a time required by the control circuit board, after temperature rise thereof by the electric power supply for said] a control involving the control of the recording operation, to show a temperature decrease corresponding to the temperature rise. ### Claim 5 (depends on 4) A recording apparatus according to claim 4, wherein said recording head includes a bubble generator constructed to generate a bubble in ink by thermal energy, and an ink discharger constructed to effect ink discharge as a result of formation of the bubble. ### Claim 6 (depends on 1) A recording apparatus according to claim 1, wherein the correction value is not selected as zero only if the first activation time is equal to or longer than a predetermined time. ### Claim 7 (depends on 6) A recording apparatus according to claim 6, wherein the predetermined time is a time required by the control circuit board to reach a saturated temperature rise, by the electric power supply, for a control not involving the control for the recording operation. ### Claim 8 (depends on 7) A recording apparatus according to claim 7, wherein the recording head includes a bubble generator constructed to generate a bubble in ink by thermal energy, and an ink discharger constructed to effect ink discharge as a result of formation of the bubble. ### Claim 9 (depends on 1) A recording apparatus according to claim 1, wherein said determination unit determines a correction value directly in accordance with the measured first activation time. ### Claim 10 A temperature detecting method for a recording apparatus, for effecting recording with a recording head on a recording medium, the apparatus including a temperature detector provided on a control circuit board of the recording apparatus, said method comprising the steps of: measuring a first activation time for electric power supply to the control circuit board for a control not involving control of a recording operation; and determining a timing of reading a surrounding temperature detected by the temperature detector and determining a correction value for correcting a thus read temperature, according to the measured first activation time. ### Claim 11 (depends on 10) A temperature detecting method according to claim 10, wherein said time measuring step includes measuring after electric power supply to the control circuit board for a control involving control of a recording operation, a second activation time of electric power supply to the control circuit board for a control not involving the control of the recording operation; and wherein said determining step includes determining a timing of reading the surrounding temperature detected by the temperature detector and determining a correction value for correcting a read temperature, according to the second activation time. ### Claim 12 (depends on 11) A temperature detecting method according to claim 11, wherein the correction timing is not selected as zero only if the second activation time is equal to or longer than a predetermined time. ### Claim 13 (depends on 12) A temperature detecting method according to claim 12, wherein the predetermined time is a time required by the control circuit board, after temperature rise thereof by the electric power supply for a control involving the control of the recording operation, to show a temperature decrease corresponding to the temperature rise. ### Claim 14 (depends on 13) A temperature detecting method according to claim 13, wherein the recording head includes a bubble generator constructed to generate a bubble in ink by thermal energy, and an ink discharger constructed to effect ink discharge as a result of formation of the bubble. ### Claim 15 (depends on 10) A temperature detecting method according to claim 10, wherein the correction value is not selected as zero only if the first activation time is equal to or longer than a predetermined time. ### Claim 16 (depends on 15) A temperature detecting method according to claim 15, wherein the predetermined time is a time required by the control circuit board to reach a saturated temperature rise, by the electric power supply, for a control not involving the control for the recording operation. ### Claim 17 (depends on 16) A temperature detecting method according to claim 16, wherein the recording head includes a bubble generator constructed to generate a bubble in ink by thermal energy, and an ink discharger constructed to effect ink discharge as a result of formation of the bubble. ### Claim 18 (depends on 10) A temperature detecting method according to claim 10, wherein said determining step includes determining a correction value directly in accordance with the measured first activation time. ### Claim 19 A recording apparatus for effecting recording with a recording head on a recording medium, comprising: a temperature detector provided on a control circuit board of said recording apparatus and adapted to detect a surrounding temperature at a position of the control circuit board; elapsed time measuring means for measuring an elapsed time from a completion of previous recording; and means for determining a correction value for correcting the surrounding temperature detected from said temperature detector in accordance with the elapsed time measured by said elapsed time measuring means; means for determining an acquiring timing of the surrounding temperature by said temperature detector in accordance with a detection result of said elapsed time measuring means. ### Claim 20 (depends on 19) A recording apparatus according to claim 19, wherein the recording head includes a bubble generator constructed to generate a bubble in ink by thermal energy, and an ink discharger constructed to effect ink discharge as a result of formation of the bubble. ### Claim 21 A temperature detecting method for a recording apparatus, for effecting recording with a recording head on a recording medium, the apparatus including a temperature detector provided on a control circuit board of the recording apparatus, said method comprising the steps of: measuring an elapsed time from completion of a previous recording; determining a correction value to correct the surrounding temperature detected from said temperature detector in accordance with the elapsed time measured; determining an acquiring timing of the surrounding temperature in accordance with a detection result of said elapsed time in said measuring step.