JPS5451452A - Light emitting element drive circuit - Google Patents

Light emitting element drive circuit

Info

Publication number
JPS5451452A
JPS5451452A JP11774677A JP11774677A JPS5451452A JP S5451452 A JPS5451452 A JP S5451452A JP 11774677 A JP11774677 A JP 11774677A JP 11774677 A JP11774677 A JP 11774677A JP S5451452 A JPS5451452 A JP S5451452A
Authority
JP
Japan
Prior art keywords
light emitting
turned
emitting element
input signal
flowed
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
JP11774677A
Other languages
Japanese (ja)
Inventor
Haruo Fujiwara
Mitsuhiro Motegi
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 JP11774677A priority Critical patent/JPS5451452A/en
Publication of JPS5451452A publication Critical patent/JPS5451452A/en
Pending legal-status Critical Current

Links

Landscapes

  • Led Devices (AREA)
  • Control Of Non-Electrical Variables (AREA)

Abstract

PURPOSE: To establish the light emitting element driving circuit with stable operation by a simple constitution, by providing the transistor TR and the light emitting element and by providing the circuit constitution in which either of TR or light emitting element is turned ON of OFF and the constant current absorbing section.
CONSTITUTION: When the input signal of the input terminal In is at high level, TR1 is turned on, but the current flowed to the light emitting element LD is slight and most of the current is flowed to the constant current absorbing section TR3. When the input signal at low level, TR1 is turned OFF and the current of the constant current absorbing section TR3 is flowed to the element LD. Thus, with the input signal in high level, TR1 is turned ON and the element LD is turned OFF, and with the input signal of low level, TR1 is turned OFF and the element LD is turned ON, causing the input pulse signal into photo pulse signal. Thus, without fluctuating and increasing the power consumption the driving circuit for the light emitting element performing stable operation can be obtained
COPYRIGHT: (C)1979,JPO&Japio
JP11774677A 1977-09-30 1977-09-30 Light emitting element drive circuit Pending JPS5451452A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11774677A JPS5451452A (en) 1977-09-30 1977-09-30 Light emitting element drive circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11774677A JPS5451452A (en) 1977-09-30 1977-09-30 Light emitting element drive circuit

Publications (1)

Publication Number Publication Date
JPS5451452A true JPS5451452A (en) 1979-04-23

Family

ID=14719276

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11774677A Pending JPS5451452A (en) 1977-09-30 1977-09-30 Light emitting element drive circuit

Country Status (1)

Country Link
JP (1) JPS5451452A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63197115A (en) * 1987-02-12 1988-08-16 Nec Corp Optical transmitter
JPH0334257U (en) * 1989-08-14 1991-04-04

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63197115A (en) * 1987-02-12 1988-08-16 Nec Corp Optical transmitter
JPH0334257U (en) * 1989-08-14 1991-04-04

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