JPH0415005U - - Google Patents
Info
- Publication number
- JPH0415005U JPH0415005U JP5427090U JP5427090U JPH0415005U JP H0415005 U JPH0415005 U JP H0415005U JP 5427090 U JP5427090 U JP 5427090U JP 5427090 U JP5427090 U JP 5427090U JP H0415005 U JPH0415005 U JP H0415005U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- output
- capacitance
- pass filter
- voltage conversion
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 7
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Description
第1図はこの考案の一実施例による静電容量式
厚さ・枚数検出装置のブロツク図、第2図は第1
図の静電容量−電圧変換回路6の詳細を示す回路
図、第3図は第1図のハイパスフイルタ12の詳
細を示す回路図、第4図は第3図のハイパスフイ
ルタ12の特性を示す図、第5図は第1図のボト
ムホールド回路の詳細を示す回路図、第6図は第
1図に示す静電容量式厚さ・枚数検出装置におい
て、ボトムホールド回路80および減算回路82
がない場合の動作タイミングを示す図、第7図は
第1図に示す静電容量式厚さ・枚数検出装置の動
作タイミングを示す図、第8図はこの考案に係る
静電容量式厚さ・枚数検出装置を使用した枚葉印
刷機の構成図、第9図は従来の静電容量式厚さ・
枚数検出装置のブロツク図である。
2……電極、6……静電容量−電圧変換回路、
8……電圧比較回路、12……ハイパスフイルタ
、80……ボトムホールド回路、82……減算回
路。
Figure 1 is a block diagram of a capacitive thickness/sheet count detection device according to an embodiment of this invention, and Figure 2 is a block diagram of a capacitive thickness/number of sheets detection device according to an embodiment of this invention.
3 is a circuit diagram showing details of the high-pass filter 12 shown in FIG. 1, and FIG. 4 shows characteristics of the high-pass filter 12 shown in FIG. 3. 5 is a circuit diagram showing the details of the bottom hold circuit shown in FIG.
FIG. 7 is a diagram showing the operation timing of the capacitive thickness/number of sheets detection device shown in FIG. 1, and FIG.・A configuration diagram of a sheet-fed printing machine using a sheet number detection device, Figure 9 shows a conventional capacitive thickness printing machine.
FIG. 3 is a block diagram of a sheet number detection device. 2... Electrode, 6... Capacitance-voltage conversion circuit,
8... Voltage comparison circuit, 12... High pass filter, 80... Bottom hold circuit, 82... Subtraction circuit.
Claims (1)
対の電極、 電極間の静電容量の変化に応じて出力電圧を変
化させる静電容量−電圧変換回路、 静電容量−電圧変換回路の出力電圧に基づいて
、検出対象が所定の厚さもしくは所定の枚数であ
るかを判定する判定回路、 を備えた静電容量式厚さ・枚数検出装置におい
て、 静電容量−電圧変換回路と判定回路との間に高
域通過フイルタを設けるとともに、 高域通過フイルタの出力を下限保持回路に与え
、 高域通過フイルタの出力から下限保持回路の出
力を減算して判定回路に出力すること、 を特徴とする静電容量式厚さ・枚数検出装置。[Claims for Utility Model Registration] A pair of electrodes arranged to face each other with a detection target in between, a capacitance-to-voltage conversion circuit that changes output voltage according to changes in capacitance between the electrodes, and electrostatic capacitance. A capacitive thickness/number of sheets detection device comprising: a determination circuit that determines whether a detection target has a predetermined thickness or a predetermined number of sheets based on the output voltage of the capacitance-voltage conversion circuit; - A high-pass filter is provided between the voltage conversion circuit and the judgment circuit, and the output of the high-pass filter is given to the lower limit holding circuit, and the judgment circuit subtracts the output of the lower limit holding circuit from the output of the high-pass filter. A capacitive thickness/sheet count detection device characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5427090U JPH0415005U (en) | 1990-05-23 | 1990-05-23 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5427090U JPH0415005U (en) | 1990-05-23 | 1990-05-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0415005U true JPH0415005U (en) | 1992-02-06 |
Family
ID=31576186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP5427090U Pending JPH0415005U (en) | 1990-05-23 | 1990-05-23 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0415005U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003083771A1 (en) * | 2002-04-03 | 2003-10-09 | Canon Kabushiki Kaisha | Recording medium remaining amount sensor, image forming device having the sensor, and program |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01209308A (en) * | 1988-02-17 | 1989-08-23 | Oki Electric Ind Co Ltd | Device for detecting thickness of transported paper leaves |
-
1990
- 1990-05-23 JP JP5427090U patent/JPH0415005U/ja active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01209308A (en) * | 1988-02-17 | 1989-08-23 | Oki Electric Ind Co Ltd | Device for detecting thickness of transported paper leaves |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003083771A1 (en) * | 2002-04-03 | 2003-10-09 | Canon Kabushiki Kaisha | Recording medium remaining amount sensor, image forming device having the sensor, and program |
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