JPS54114045A - Information detecting system - Google Patents

Information detecting system

Info

Publication number
JPS54114045A
JPS54114045A JP2109478A JP2109478A JPS54114045A JP S54114045 A JPS54114045 A JP S54114045A JP 2109478 A JP2109478 A JP 2109478A JP 2109478 A JP2109478 A JP 2109478A JP S54114045 A JPS54114045 A JP S54114045A
Authority
JP
Japan
Prior art keywords
current
current value
detector
emitted
laser
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
JP2109478A
Other languages
Japanese (ja)
Inventor
Yukio Kurata
Morichika Yano
Saburo Yamamoto
Kaneki Matsui
Akira Komuro
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 JP2109478A priority Critical patent/JPS54114045A/en
Publication of JPS54114045A publication Critical patent/JPS54114045A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To draw out the signal featuring a high S/N ratio by combining the interaction of the optical driving system and the information detection system and then securing the self-amplifying action for the detection signal via the multiple effect of the both systems.
CONSTITUTION: When switch 10 is turned on to supply the driving current approximate to the threshold level to semiconductor laser element 2 from power source 5, the laser beam is emitted from the output surface of semiconductor laser unit 8. The emitted laser beam is modulated via information storage carrier 9 to be irradiated to photo detector 6, and thus the electric resistance value of the optical conductor is reduced. As a result, the current value flowing through element 2 is increased with increment of the laser output beam. In case the output beam does not pass through carrier 9, no current amplification is caused to the driving circuit. Thus, element 2 is driven with the current value as it is. The change of the current value is detected through current detector 7 in order to detect the storage information via detector 7.
COPYRIGHT: (C)1979,JPO&Japio
JP2109478A 1978-02-24 1978-02-24 Information detecting system Pending JPS54114045A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2109478A JPS54114045A (en) 1978-02-24 1978-02-24 Information detecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2109478A JPS54114045A (en) 1978-02-24 1978-02-24 Information detecting system

Publications (1)

Publication Number Publication Date
JPS54114045A true JPS54114045A (en) 1979-09-05

Family

ID=12045276

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2109478A Pending JPS54114045A (en) 1978-02-24 1978-02-24 Information detecting system

Country Status (1)

Country Link
JP (1) JPS54114045A (en)

Similar Documents

Publication Publication Date Title
US4730108A (en) Ambient light insensitive circuit with frequency matching
JPS54114045A (en) Information detecting system
JPS577631A (en) Photoelectric switch
JPS5783079A (en) Driving method of semiconductor laser
JPS57180234A (en) Malfunction preventing circuit for photodetector
JPS52145249A (en) Object detecting apparatus
JPS54114091A (en) Semiconductor laser device
JPS55101010A (en) Photoelectric type position detecting system
JPS575187A (en) Recorder
JPS641480A (en) Controller for system coupling inverter
JPS5619439A (en) Photoelectric smoke detector
JPS57123566A (en) Detector for non-signal recording part of record disk
JPS5660357A (en) Voltage detecting circuit
JPS5315172A (en) Change component detector
JPS54101277A (en) Prober for semiconductor wafer
JPS54102870A (en) Detection method of result of bonding for semiconductor element
JPS54114052A (en) Information detecting system
JPS5377544A (en) Optical detector
JPS5657943A (en) Smoke sensing system
JPS5361299A (en) Photoelectric smoke detector
JPS553004A (en) Information reading device
JPS54107210A (en) Abnormity detection system for reading light source
JPS5333644A (en) Simple type voltage indicating system using light emitting diodes
JPS5541520A (en) Punched hole detection method and its device
JPS54129904A (en) Doubling system of light source