GB1252727A - - Google Patents

Info

Publication number
GB1252727A
GB1252727A GB1897770A GB1252727DA GB1252727A GB 1252727 A GB1252727 A GB 1252727A GB 1897770 A GB1897770 A GB 1897770A GB 1252727D A GB1252727D A GB 1252727DA GB 1252727 A GB1252727 A GB 1252727A
Authority
GB
United Kingdom
Prior art keywords
photo transistor
light
flash
heading
april
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.)
Expired
Application number
GB1897770A
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 filed Critical
Publication of GB1252727A publication Critical patent/GB1252727A/en
Expired 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

  • Electronic Switches (AREA)
  • Stroboscope Apparatuses (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

1,252,727. Photo transistor bias circuits. STANDARD TELEPHONES & CABLES Ltd. 21 April, 1970, No. 18977/70. Heading H3T. The current through a photo transistor having a capacitive output coupling is stabilized at a low level despite changes in ambient light by a feedback transistor arranged between base and emitter as shown. The circuit illustrated is for triggering an electronic photographic flash unit in response to the light from a second flash.
GB1897770A 1970-04-21 1970-04-21 Expired GB1252727A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1897770 1970-04-21

Publications (1)

Publication Number Publication Date
GB1252727A true GB1252727A (en) 1971-11-10

Family

ID=10121694

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1897770A Expired GB1252727A (en) 1970-04-21 1970-04-21

Country Status (2)

Country Link
GB (1) GB1252727A (en)
ZA (1) ZA71824B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3803034A1 (en) * 1988-02-02 1989-08-10 Sick Optik Elektronik Erwin Photoelectric receiver
DE102005036937A1 (en) * 2005-08-05 2007-02-15 Diehl Ako Stiftung & Co. Kg Measuring signal evaluating circuit for e.g. infrared push-button, has auxiliary power source causing additional current flow in case of irradiation so that switch element operates with favorable signal-to-noise ratio in case of irradiation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3803034A1 (en) * 1988-02-02 1989-08-10 Sick Optik Elektronik Erwin Photoelectric receiver
DE102005036937A1 (en) * 2005-08-05 2007-02-15 Diehl Ako Stiftung & Co. Kg Measuring signal evaluating circuit for e.g. infrared push-button, has auxiliary power source causing additional current flow in case of irradiation so that switch element operates with favorable signal-to-noise ratio in case of irradiation
DE102005036937B4 (en) * 2005-08-05 2014-02-13 Diehl Ako Stiftung & Co. Kg Evaluation circuit for an optical receiver

Also Published As

Publication number Publication date
ZA71824B (en) 1971-11-24

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees