JPS5513539A - Orignal reader - Google Patents

Orignal reader

Info

Publication number
JPS5513539A
JPS5513539A JP8579178A JP8579178A JPS5513539A JP S5513539 A JPS5513539 A JP S5513539A JP 8579178 A JP8579178 A JP 8579178A JP 8579178 A JP8579178 A JP 8579178A JP S5513539 A JPS5513539 A JP S5513539A
Authority
JP
Japan
Prior art keywords
white
peak
original
backboard
level
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
Application number
JP8579178A
Other languages
Japanese (ja)
Inventor
Tsunetoshi Nishimoto
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP8579178A priority Critical patent/JPS5513539A/en
Publication of JPS5513539A publication Critical patent/JPS5513539A/en
Pending legal-status Critical Current

Links

Landscapes

  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE: To make it possible to detect always correctly the white peak and the black peak of the actual original by detecting the difference between the white level and the black level in a period other than high-reflection factor signal periods by a backboard signal circuit.
CONSTITUTION: A original is mounted on backboard 1, and the light is irradiated to the original, and the reflection light is converted photoelectrically by 2 and is subjected to AGC, thereby obtaining picture signals while holding the difference between the white peak and the black peak constant. Here, backboard 1 is constituted by materials having a reflection factor higher than the forecasted white part of the transmission original, and the signal period of this high reflection factor is sampled to detect the difference between the white level and the balck level in a period other than this signal period by backboard signal detection circuit 4. As a result, the white peak and the black peak of the actual original can be always detected correctly.
COPYRIGHT: (C)1980,JPO&Japio
JP8579178A 1978-07-13 1978-07-13 Orignal reader Pending JPS5513539A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8579178A JPS5513539A (en) 1978-07-13 1978-07-13 Orignal reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8579178A JPS5513539A (en) 1978-07-13 1978-07-13 Orignal reader

Publications (1)

Publication Number Publication Date
JPS5513539A true JPS5513539A (en) 1980-01-30

Family

ID=13868702

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8579178A Pending JPS5513539A (en) 1978-07-13 1978-07-13 Orignal reader

Country Status (1)

Country Link
JP (1) JPS5513539A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62194045A (en) * 1986-02-15 1987-08-26 ダイムラ−ベンツ・アクチエンゲゼルシャフト Vibration damper for car

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62194045A (en) * 1986-02-15 1987-08-26 ダイムラ−ベンツ・アクチエンゲゼルシャフト Vibration damper for car

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