JPS5454528A - Optical reader - Google Patents

Optical reader

Info

Publication number
JPS5454528A
JPS5454528A JP12105277A JP12105277A JPS5454528A JP S5454528 A JPS5454528 A JP S5454528A JP 12105277 A JP12105277 A JP 12105277A JP 12105277 A JP12105277 A JP 12105277A JP S5454528 A JPS5454528 A JP S5454528A
Authority
JP
Japan
Prior art keywords
light
amount
transmission rate
applied voltage
light transmission
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
JP12105277A
Other languages
Japanese (ja)
Inventor
Kazuo Yagyu
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 JP12105277A priority Critical patent/JPS5454528A/en
Publication of JPS5454528A publication Critical patent/JPS5454528A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To avoid the mis-read-in due to the amount of light charge, by detecting the amount of light change of light source and changing the light transmission rate through the control of the applied voltage of liquid crystal.
CONSTITUTION: In the liquid crystal unit 4, the lower the applied voltage is, the higher the light transmission rate, and the higher the applied voltage becomes, the lower the light transmission rate is. Further, the voltage control circuit 5 increases the output voltage when the photo receiving amount of the photo electric conversion element 3 is greater, and controls the applied voltage of the unit 4 so that the output voltage is lower with lower light receiving amount. For example, if the light amount of the light source 1 is decreased, the light receiving amount of the element 3 is smaller. Accordingly, the output voltage of the circuit 5 is lowered and the light transmission rate is greater, increasing the light receiving amount for the element 3, and the amount of light reception is made stable for a given value
COPYRIGHT: (C)1979,JPO&Japio
JP12105277A 1977-10-10 1977-10-10 Optical reader Pending JPS5454528A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12105277A JPS5454528A (en) 1977-10-10 1977-10-10 Optical reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12105277A JPS5454528A (en) 1977-10-10 1977-10-10 Optical reader

Publications (1)

Publication Number Publication Date
JPS5454528A true JPS5454528A (en) 1979-04-28

Family

ID=14801634

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12105277A Pending JPS5454528A (en) 1977-10-10 1977-10-10 Optical reader

Country Status (1)

Country Link
JP (1) JPS5454528A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60235277A (en) * 1984-05-07 1985-11-21 Nippon Denso Co Ltd Optical information reader

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60235277A (en) * 1984-05-07 1985-11-21 Nippon Denso Co Ltd Optical information reader

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