JPS5725774A - Processing circuit of light volume detection signal for solid state scanner - Google Patents

Processing circuit of light volume detection signal for solid state scanner

Info

Publication number
JPS5725774A
JPS5725774A JP10075180A JP10075180A JPS5725774A JP S5725774 A JPS5725774 A JP S5725774A JP 10075180 A JP10075180 A JP 10075180A JP 10075180 A JP10075180 A JP 10075180A JP S5725774 A JPS5725774 A JP S5725774A
Authority
JP
Japan
Prior art keywords
light volume
amplifier
signal
supplied
solid state
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
JP10075180A
Other languages
Japanese (ja)
Other versions
JPH0147945B2 (en
Inventor
Yoshiaki Kamimoto
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP10075180A priority Critical patent/JPS5725774A/en
Publication of JPS5725774A publication Critical patent/JPS5725774A/en
Publication of JPH0147945B2 publication Critical patent/JPH0147945B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/40056—Circuits for driving or energising particular reading heads or original illumination means

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Transforming Light Signals Into Electric Signals (AREA)

Abstract

PURPOSE:To increase the reliability of a solid state scanner, by detecting the fluctuation of light volume by a unit of light volume sensor and then normalizing the picture signal according to the change of light volume as well as performing the display of alarm and the discontinuation of functioning in case the light volume is reduced. CONSTITUTION:The light volume of a light source is detected by light volume sensor 10, and the detection signal is supplied to an error amplifier 11. A certain reference value Vr1 set previously is supplied to the amplifier 11, and the differece to the input signal is delivered in the form of an error signal ER to be supplied to a voltage control amplifier 13 as well as to cmparators 14 and 15. For the amplifier 13, the amplification factor decreases and increases as the error signal decreases and increases respectively. Then the amplifier 13 normalizes the picture signal PS and then delivers it. At the same time, the error signal is compared with reference values Vr2 and Vr3 decided by comparators 14 and 15 respecitvely. The ''1'' is delivered when the signal ER is larger than the values Vr2 and Vr3; and the display of alarm and the discontinuation of functioning are carried out when the light volume becomes less than the prescribed value.
JP10075180A 1980-07-23 1980-07-23 Processing circuit of light volume detection signal for solid state scanner Granted JPS5725774A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10075180A JPS5725774A (en) 1980-07-23 1980-07-23 Processing circuit of light volume detection signal for solid state scanner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10075180A JPS5725774A (en) 1980-07-23 1980-07-23 Processing circuit of light volume detection signal for solid state scanner

Publications (2)

Publication Number Publication Date
JPS5725774A true JPS5725774A (en) 1982-02-10
JPH0147945B2 JPH0147945B2 (en) 1989-10-17

Family

ID=14282220

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10075180A Granted JPS5725774A (en) 1980-07-23 1980-07-23 Processing circuit of light volume detection signal for solid state scanner

Country Status (1)

Country Link
JP (1) JPS5725774A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5922481A (en) * 1982-07-28 1984-02-04 Konishiroku Photo Ind Co Ltd Ripple correcting device
JPS61112472A (en) * 1984-10-09 1986-05-30 Fujitsu Ltd Optical reading device
US4616253A (en) * 1982-06-02 1986-10-07 Nippon Kogaku K.K. White balance control apparatus for color video cameras
JPS63160462A (en) * 1986-12-24 1988-07-04 Ricoh Co Ltd Reader
JPS63178661A (en) * 1987-01-19 1988-07-22 Agency Of Ind Science & Technol Original reader

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102219000B1 (en) * 2019-05-20 2021-02-23 주식회사 스토리메이커 The apparatus and method of developing emotion

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5315017A (en) * 1976-07-27 1978-02-10 Matsushita Electric Ind Co Ltd Facsimile equipment
JPS545323A (en) * 1977-06-14 1979-01-16 Ricoh Co Ltd Compensating unit for light source output variation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5315017A (en) * 1976-07-27 1978-02-10 Matsushita Electric Ind Co Ltd Facsimile equipment
JPS545323A (en) * 1977-06-14 1979-01-16 Ricoh Co Ltd Compensating unit for light source output variation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4616253A (en) * 1982-06-02 1986-10-07 Nippon Kogaku K.K. White balance control apparatus for color video cameras
JPS5922481A (en) * 1982-07-28 1984-02-04 Konishiroku Photo Ind Co Ltd Ripple correcting device
JPS61112472A (en) * 1984-10-09 1986-05-30 Fujitsu Ltd Optical reading device
JPS63160462A (en) * 1986-12-24 1988-07-04 Ricoh Co Ltd Reader
JPS63178661A (en) * 1987-01-19 1988-07-22 Agency Of Ind Science & Technol Original reader

Also Published As

Publication number Publication date
JPH0147945B2 (en) 1989-10-17

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