JPS6468686A - Paper sheet detecting device - Google Patents

Paper sheet detecting device

Info

Publication number
JPS6468686A
JPS6468686A JP62223983A JP22398387A JPS6468686A JP S6468686 A JPS6468686 A JP S6468686A JP 62223983 A JP62223983 A JP 62223983A JP 22398387 A JP22398387 A JP 22398387A JP S6468686 A JPS6468686 A JP S6468686A
Authority
JP
Japan
Prior art keywords
sensor
current
values
stored
decided
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
JP62223983A
Other languages
Japanese (ja)
Other versions
JPH0814625B2 (en
Inventor
Shinichi Men
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 JP62223983A priority Critical patent/JPH0814625B2/en
Publication of JPS6468686A publication Critical patent/JPS6468686A/en
Publication of JPH0814625B2 publication Critical patent/JPH0814625B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Accessory Devices And Overall Control Thereof (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Controlling Sheets Or Webs (AREA)

Abstract

PURPOSE:To reduce the influence of a secular change and to accurately detect a paper sheet by setting a current applied to a reflection type sensor before detection to the best value and correcting the sensitivity of the sensor. CONSTITUTION:A motor 14 is driven to move a carriage and a black reference reflecting plate 1 and the detection sensor 4 are opposed to each other. Then plural kinds of current value data are read out of a ROM 11 and applied to a D/A converter 5 to supply a current iL which increases gradually to a projection part 4A. Then the photodetection output of a photodetector 4B is compared with a threshold voltage VTH successively and current values which are decided as black values are stored in a RAM 12. Then a white reference reflecting plate 2 is opposed to the sensor 4 and current values which are decided as white values are stored similarly. Consequently, the center value of the stored current values is supplied to a projector 4A by reflecting plates 1 and 2 to detect recording paper 3. Thus, the sensor 4 is set to the best sensitivity and stable detection is performed.
JP62223983A 1987-09-09 1987-09-09 Paper sheet detector Expired - Fee Related JPH0814625B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62223983A JPH0814625B2 (en) 1987-09-09 1987-09-09 Paper sheet detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62223983A JPH0814625B2 (en) 1987-09-09 1987-09-09 Paper sheet detector

Publications (2)

Publication Number Publication Date
JPS6468686A true JPS6468686A (en) 1989-03-14
JPH0814625B2 JPH0814625B2 (en) 1996-02-14

Family

ID=16806740

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62223983A Expired - Fee Related JPH0814625B2 (en) 1987-09-09 1987-09-09 Paper sheet detector

Country Status (1)

Country Link
JP (1) JPH0814625B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5502209A (en) * 1994-07-05 1996-03-26 Sanwa Kagaku Kenkyusho Co., Ltd. Benzopyrancarboxamide derivatives, salts thereof, process for the preparation of same and use thereof
JP2010286536A (en) * 2009-06-09 2010-12-24 Kyocera Mita Corp Image forming apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5748640A (en) * 1980-09-08 1982-03-20 Ricoh Co Ltd Measuring apparatus of optical density
JPS5970990A (en) * 1982-10-18 1984-04-21 Ricoh Co Ltd Light regulation
JPS60149948A (en) * 1984-01-18 1985-08-07 Yaskawa Electric Mfg Co Ltd Density detection apparatus
JPS61188532A (en) * 1985-02-18 1986-08-22 Ricoh Co Ltd Device for detecting original density in copying machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5748640A (en) * 1980-09-08 1982-03-20 Ricoh Co Ltd Measuring apparatus of optical density
JPS5970990A (en) * 1982-10-18 1984-04-21 Ricoh Co Ltd Light regulation
JPS60149948A (en) * 1984-01-18 1985-08-07 Yaskawa Electric Mfg Co Ltd Density detection apparatus
JPS61188532A (en) * 1985-02-18 1986-08-22 Ricoh Co Ltd Device for detecting original density in copying machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5502209A (en) * 1994-07-05 1996-03-26 Sanwa Kagaku Kenkyusho Co., Ltd. Benzopyrancarboxamide derivatives, salts thereof, process for the preparation of same and use thereof
JP2010286536A (en) * 2009-06-09 2010-12-24 Kyocera Mita Corp Image forming apparatus

Also Published As

Publication number Publication date
JPH0814625B2 (en) 1996-02-14

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees