JPS55140274A - Photosensor - Google Patents

Photosensor

Info

Publication number
JPS55140274A
JPS55140274A JP4868479A JP4868479A JPS55140274A JP S55140274 A JPS55140274 A JP S55140274A JP 4868479 A JP4868479 A JP 4868479A JP 4868479 A JP4868479 A JP 4868479A JP S55140274 A JPS55140274 A JP S55140274A
Authority
JP
Japan
Prior art keywords
article
diode
resistor
transistor
photosensor
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
JP4868479A
Other languages
Japanese (ja)
Inventor
Shozo Shimizu
Kazuhiro Azuma
Yoshio Fujimaru
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
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 Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to JP4868479A priority Critical patent/JPS55140274A/en
Publication of JPS55140274A publication Critical patent/JPS55140274A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/1895—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using light change detection systems

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Light Receiving Elements (AREA)

Abstract

PURPOSE:To increase the S/N ratio of a photosensor and exactly detect an article having high light transmission factor by the photosensor by connecting switching means through a differentiator to the output side of a photodetector. CONSTITUTION:A light emitting diode 1 and a phototransistor 2 are facted oppositely with each other in an air gap 4 for passing an article to be detected in a transparent case 3, predetermined current is flows through the diode 1, and the diode 1 is irradiated with light. The diode 1 and the phototransistor 2 are connected through bias resistors 5, 6, respectively in parallel with each other, and a comparator 7 is connected to both terminals of a resistor 6 connected in series with the transistor 2. Then, a differentiator 8 consisting of a capacitor 9 and a resistor 10 is connected to the midpoint of the transistor 2 and the resistor 6, and is applied at its output to the comparator 7. Thus, the voltage occurred at the transistor 2 is varied according to the existence or absence of the article in the gap 4, thereby exactly detecting the article in the gap 4.
JP4868479A 1979-04-19 1979-04-19 Photosensor Pending JPS55140274A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4868479A JPS55140274A (en) 1979-04-19 1979-04-19 Photosensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4868479A JPS55140274A (en) 1979-04-19 1979-04-19 Photosensor

Publications (1)

Publication Number Publication Date
JPS55140274A true JPS55140274A (en) 1980-11-01

Family

ID=12810136

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4868479A Pending JPS55140274A (en) 1979-04-19 1979-04-19 Photosensor

Country Status (1)

Country Link
JP (1) JPS55140274A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS545458B2 (en) * 1974-12-05 1979-03-16

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS545458B2 (en) * 1974-12-05 1979-03-16

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