JPS5556673A - Photocoupler - Google Patents

Photocoupler

Info

Publication number
JPS5556673A
JPS5556673A JP12998478A JP12998478A JPS5556673A JP S5556673 A JPS5556673 A JP S5556673A JP 12998478 A JP12998478 A JP 12998478A JP 12998478 A JP12998478 A JP 12998478A JP S5556673 A JPS5556673 A JP S5556673A
Authority
JP
Japan
Prior art keywords
resistor
light
led
constitution
degradation
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
JP12998478A
Other languages
Japanese (ja)
Inventor
Hiroshi Matsunaga
Shinichiro Obara
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP12998478A priority Critical patent/JPS5556673A/en
Publication of JPS5556673A publication Critical patent/JPS5556673A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent aging change in characteristics of a photocoupler in a simple constitution wherein a resistor whose resistance varies with the light from a light emitting diode is provided.
CONSTITUTION: A resistor R whose resistance varies with the light from a LED 11 is connected in series with a photodetecting transistor 12. In this constitution, since the resistance of the resistor R increases with degradation of light-emitting efficiency of the LED, decrease in the transistor current due to the degradation of light emitting efficiency of the LED is compensated, and the voltage generated across the resistor R can be maintained at an approximately constant level.
COPYRIGHT: (C)1980,JPO&Japio
JP12998478A 1978-10-24 1978-10-24 Photocoupler Pending JPS5556673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12998478A JPS5556673A (en) 1978-10-24 1978-10-24 Photocoupler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12998478A JPS5556673A (en) 1978-10-24 1978-10-24 Photocoupler

Publications (1)

Publication Number Publication Date
JPS5556673A true JPS5556673A (en) 1980-04-25

Family

ID=15023273

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12998478A Pending JPS5556673A (en) 1978-10-24 1978-10-24 Photocoupler

Country Status (1)

Country Link
JP (1) JPS5556673A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5889047U (en) * 1981-12-11 1983-06-16 ジヨンソン株式会社 aromatic container

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5889047U (en) * 1981-12-11 1983-06-16 ジヨンソン株式会社 aromatic container
JPS623156Y2 (en) * 1981-12-11 1987-01-24

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