JPS6488144A - Humidity measuring instrument - Google Patents

Humidity measuring instrument

Info

Publication number
JPS6488144A
JPS6488144A JP62243863A JP24386387A JPS6488144A JP S6488144 A JPS6488144 A JP S6488144A JP 62243863 A JP62243863 A JP 62243863A JP 24386387 A JP24386387 A JP 24386387A JP S6488144 A JPS6488144 A JP S6488144A
Authority
JP
Japan
Prior art keywords
output
humidity
humidity sensor
oscillation
amplitude
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP62243863A
Other languages
Japanese (ja)
Other versions
JP2572240B2 (en
Inventor
Koji Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP62243863A priority Critical patent/JP2572240B2/en
Publication of JPS6488144A publication Critical patent/JPS6488144A/en
Priority to US07/534,365 priority patent/US5034772A/en
Application granted granted Critical
Publication of JP2572240B2 publication Critical patent/JP2572240B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To improve the accuracy of humidity measurement at the periphery of a developing device by supplying an oscillation output which has a prescribed frequency and amplitude to a humidity sensor, amplifying, rectifying and smoothing the output of the humidity sensor, and inputting the output to a controller. CONSTITUTION:The oscillation output which has the prescribed frequency and amplitude is supplied from the oscillation circuit 31 to the humidity sensor 19a through a resistance R1 and a capacitor C1 and the output of the humidity sensor 1 is passed through a capacitor C2 and amplified by an operational amplifier 33 with high input impedance; and its output is rectified by a DC detecting circuit 34 and then smoothed by an integrating circuit 35, the output impedance is lowered by an operational amplifier 36, and the output is connected to the input of the A/D converter of a controller through a terminal P4. This constitution improves the accuracy of humidity measurement at the periphery of the developing device for compensating variation in development characteristics with humidity.
JP62243863A 1987-09-25 1987-09-30 Humidity measuring device Expired - Lifetime JP2572240B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP62243863A JP2572240B2 (en) 1987-09-30 1987-09-30 Humidity measuring device
US07/534,365 US5034772A (en) 1987-09-25 1990-06-05 Humidity measurement device and image forming apparatus having the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62243863A JP2572240B2 (en) 1987-09-30 1987-09-30 Humidity measuring device

Publications (2)

Publication Number Publication Date
JPS6488144A true JPS6488144A (en) 1989-04-03
JP2572240B2 JP2572240B2 (en) 1997-01-16

Family

ID=17110091

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62243863A Expired - Lifetime JP2572240B2 (en) 1987-09-25 1987-09-30 Humidity measuring device

Country Status (1)

Country Link
JP (1) JP2572240B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5585559A (en) * 1994-03-25 1996-12-17 Canon Kabushiki Kaisha Environment measuring apparatus
US8224198B2 (en) * 2008-06-02 2012-07-17 Brother Kogyo Kabushiki Kaisha Humidity detecting device and image forming apparatus including the same
US9753430B2 (en) 2013-03-25 2017-09-05 Brother Kogyo Kabushiki Kaisha Sensor device having plural resistance change sensors and method of using the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6046452A (en) * 1983-08-24 1985-03-13 Marcon Electronics Co Ltd Humidity detecting circuit
JPS61256247A (en) * 1985-05-09 1986-11-13 Fujitsu General Ltd Atmosphere controller
JPS61296249A (en) * 1985-06-25 1986-12-27 Fujitsu General Ltd Method for correcting output of sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6046452A (en) * 1983-08-24 1985-03-13 Marcon Electronics Co Ltd Humidity detecting circuit
JPS61256247A (en) * 1985-05-09 1986-11-13 Fujitsu General Ltd Atmosphere controller
JPS61296249A (en) * 1985-06-25 1986-12-27 Fujitsu General Ltd Method for correcting output of sensor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5585559A (en) * 1994-03-25 1996-12-17 Canon Kabushiki Kaisha Environment measuring apparatus
US8224198B2 (en) * 2008-06-02 2012-07-17 Brother Kogyo Kabushiki Kaisha Humidity detecting device and image forming apparatus including the same
US9753430B2 (en) 2013-03-25 2017-09-05 Brother Kogyo Kabushiki Kaisha Sensor device having plural resistance change sensors and method of using the same

Also Published As

Publication number Publication date
JP2572240B2 (en) 1997-01-16

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term