JPS57159127A - Driving circuit device for light protecting element and photodetector - Google Patents

Driving circuit device for light protecting element and photodetector

Info

Publication number
JPS57159127A
JPS57159127A JP4455081A JP4455081A JPS57159127A JP S57159127 A JPS57159127 A JP S57159127A JP 4455081 A JP4455081 A JP 4455081A JP 4455081 A JP4455081 A JP 4455081A JP S57159127 A JPS57159127 A JP S57159127A
Authority
JP
Japan
Prior art keywords
capacitor
photodetector
driving circuit
circuit device
protecting element
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
JP4455081A
Other languages
Japanese (ja)
Inventor
Kazuaki Urasaki
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.)
Omron Corp
Original Assignee
Tateisi Electronics Co
Omron Tateisi Electronics Co
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 Tateisi Electronics Co, Omron Tateisi Electronics Co filed Critical Tateisi Electronics Co
Priority to JP4455081A priority Critical patent/JPS57159127A/en
Publication of JPS57159127A publication Critical patent/JPS57159127A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To prevent a light emitting element from being destroyed with an excessive current, by driving the light emitting element through the control of discharge energy of a capacitor once charged. CONSTITUTION:A switching circuit 42 has an oscillation circuit. A capacitor 40 is charged at the first ''H'' level of the oscillation output and the charge in the capacitor 40 at the next ''H'' level is applied to a capacitor 41. When a terminal voltage of the capacitor 41 reaches a power supply voltage with some cycles of the oscillation output, an MOS transistor 36 is conductive and a charge in the capacitor 41 is applied to a light projecting and photodetector 11 for light emission. Since the amount of electricity charageable in the capacitor 41 is very little, the element can not be destroyed.
JP4455081A 1981-03-25 1981-03-25 Driving circuit device for light protecting element and photodetector Pending JPS57159127A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4455081A JPS57159127A (en) 1981-03-25 1981-03-25 Driving circuit device for light protecting element and photodetector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4455081A JPS57159127A (en) 1981-03-25 1981-03-25 Driving circuit device for light protecting element and photodetector

Publications (1)

Publication Number Publication Date
JPS57159127A true JPS57159127A (en) 1982-10-01

Family

ID=12694601

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4455081A Pending JPS57159127A (en) 1981-03-25 1981-03-25 Driving circuit device for light protecting element and photodetector

Country Status (1)

Country Link
JP (1) JPS57159127A (en)

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