JPS6488144A - Humidity measuring instrument - Google Patents
Humidity measuring instrumentInfo
- 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
Links
- 230000010355 oscillation Effects 0.000 abstract 3
- 239000003990 capacitor Substances 0.000 abstract 2
- 238000005259 measurement Methods 0.000 abstract 2
- 238000009499 grossing Methods 0.000 abstract 1
Landscapes
- 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.
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)
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)
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 |
-
1987
- 1987-09-30 JP JP62243863A patent/JP2572240B2/en not_active Expired - Lifetime
Patent Citations (3)
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)
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 |