JPS5649584A - Composite photocoupler - Google Patents

Composite photocoupler

Info

Publication number
JPS5649584A
JPS5649584A JP12414479A JP12414479A JPS5649584A JP S5649584 A JPS5649584 A JP S5649584A JP 12414479 A JP12414479 A JP 12414479A JP 12414479 A JP12414479 A JP 12414479A JP S5649584 A JPS5649584 A JP S5649584A
Authority
JP
Japan
Prior art keywords
light
led
current
impedance
volume
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
JP12414479A
Other languages
Japanese (ja)
Inventor
Yoshitoshi Yamauchi
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP12414479A priority Critical patent/JPS5649584A/en
Publication of JPS5649584A publication Critical patent/JPS5649584A/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
    • H03K17/795—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 controlling bipolar transistors
    • H03K17/7955—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 controlling bipolar transistors using phototransistors

Landscapes

  • Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)

Abstract

PURPOSE:To prevent change in the impedance of a phototransistor on the output side due to temperatue by a system wherein two phototransistors are closely located on the same pellet, a allowing them to equally receive light from one LED. CONSTITUTION:When phototransistors PT1, PT2 equally receive light from an LED, and when their internal impedance is Z1=Z2, the relation between an operating AMP input Ein and the current Ic flowing from the constant-current regulated power to PT1 is Z1=Z2=Ein/Ic. As the temperature rises, the PT increases hFE and a light current. Therefore, the output impedance to the PT2 is reduced, but Z1 decreases because of the increased light current in the PT1, while the negative feedback volume to the operating AMP increases. Thus, the operating AMP output is lowered. For this reason, light volume from the LED decreases, which prevents an increase in light current toward each PT. As the temperature falls, hEF as well as the negative feedback volume to the operating AMP decrease, while output voltage increases so that the light volume of the LED is increased. Therefore, input voltage can be always correctly delivered by impedance coupling without being affected by temperatures, thus making it applicable to an analogue circuit.
JP12414479A 1979-09-28 1979-09-28 Composite photocoupler Pending JPS5649584A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12414479A JPS5649584A (en) 1979-09-28 1979-09-28 Composite photocoupler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12414479A JPS5649584A (en) 1979-09-28 1979-09-28 Composite photocoupler

Publications (1)

Publication Number Publication Date
JPS5649584A true JPS5649584A (en) 1981-05-06

Family

ID=14878012

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12414479A Pending JPS5649584A (en) 1979-09-28 1979-09-28 Composite photocoupler

Country Status (1)

Country Link
JP (1) JPS5649584A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2703866A1 (en) * 1993-04-09 1994-10-14 Rockwell International Corp Device for coupling by opto-coupler between a modem and a telephone line
JPH0843201A (en) * 1994-07-27 1996-02-16 Murata Mfg Co Ltd Pyroelectric infrared sensor circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2703866A1 (en) * 1993-04-09 1994-10-14 Rockwell International Corp Device for coupling by opto-coupler between a modem and a telephone line
JPH0843201A (en) * 1994-07-27 1996-02-16 Murata Mfg Co Ltd Pyroelectric infrared sensor circuit

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