JPS55166772A - Light quantity control system of optical reader - Google Patents

Light quantity control system of optical reader

Info

Publication number
JPS55166772A
JPS55166772A JP7529979A JP7529979A JPS55166772A JP S55166772 A JPS55166772 A JP S55166772A JP 7529979 A JP7529979 A JP 7529979A JP 7529979 A JP7529979 A JP 7529979A JP S55166772 A JPS55166772 A JP S55166772A
Authority
JP
Japan
Prior art keywords
light
read
light source
detected
control system
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
JP7529979A
Other languages
Japanese (ja)
Inventor
Kimio Yatsunami
Yoshihiko Iwamoto
Seiji Amazaki
Shigeo Terajima
Takaaki Okamoto
Shoichi Yasuda
Masahiro Horii
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP7529979A priority Critical patent/JPS55166772A/en
Publication of JPS55166772A publication Critical patent/JPS55166772A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To keep the quantity of real light constant by photodetecting light which does not contribute to a code read and controlling the quantity of light from light source, based on the photo-detected light. CONSTITUTION:The code of article 7 placed on scanning window 6 is read with light arriving from light source 1 by way of reflecting plate 2 and rotary mirror 13. Reflecting plate 2 is driven at not less than a normal read scanning angle. Then, light which does not contribute to the read is detected by photodetecting method 9. The detected light is led to light source driving method 11 via feedback method 10. Consequently, the quantity of light from light source 1 can be kept constant without reference fluctuations of a temperature, etc.
JP7529979A 1979-06-14 1979-06-14 Light quantity control system of optical reader Pending JPS55166772A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7529979A JPS55166772A (en) 1979-06-14 1979-06-14 Light quantity control system of optical reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7529979A JPS55166772A (en) 1979-06-14 1979-06-14 Light quantity control system of optical reader

Publications (1)

Publication Number Publication Date
JPS55166772A true JPS55166772A (en) 1980-12-26

Family

ID=13572222

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7529979A Pending JPS55166772A (en) 1979-06-14 1979-06-14 Light quantity control system of optical reader

Country Status (1)

Country Link
JP (1) JPS55166772A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60115910A (en) * 1983-11-28 1985-06-22 Kubota Ltd Beam light projecting device
JPS60129724A (en) * 1983-12-19 1985-07-11 Canon Inc Optical laser scanning device
EP0158288A2 (en) * 1984-04-11 1985-10-16 Sharp Kabushiki Kaisha Photoelectric reading apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60115910A (en) * 1983-11-28 1985-06-22 Kubota Ltd Beam light projecting device
JPH0335645B2 (en) * 1983-11-28 1991-05-29 Kubota Kk
JPS60129724A (en) * 1983-12-19 1985-07-11 Canon Inc Optical laser scanning device
EP0158288A2 (en) * 1984-04-11 1985-10-16 Sharp Kabushiki Kaisha Photoelectric reading apparatus

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