JPS6444884A - Direction detecting type pyroelectric sensor - Google Patents

Direction detecting type pyroelectric sensor

Info

Publication number
JPS6444884A
JPS6444884A JP62202049A JP20204987A JPS6444884A JP S6444884 A JPS6444884 A JP S6444884A JP 62202049 A JP62202049 A JP 62202049A JP 20204987 A JP20204987 A JP 20204987A JP S6444884 A JPS6444884 A JP S6444884A
Authority
JP
Japan
Prior art keywords
threshold value
time
elements
lower threshold
upper threshold
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
JP62202049A
Other languages
Japanese (ja)
Inventor
Yutaka Kojima
Yoji Konishi
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP62202049A priority Critical patent/JPS6444884A/en
Publication of JPS6444884A publication Critical patent/JPS6444884A/en
Pending legal-status Critical Current

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  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

PURPOSE:To prevent erroneous operation due to disturbance light or sudden temp. change, by connecting an even number of four or more pyroeletric elements in series so as to become alternately inverse polarities. CONSTITUTION:Four pyroeletric elements 11-14 are connected in series so as to become alternately inverse polarities. When an object moves to the right as shown by a drawing (a) to pass the element 11, the time before output voltage exceeds an upper threshold value V1 at first to reach a lower threshold value V2 is set to T1 and the time before said voltage exceeds the upper threshold value V1 from that point of time to again reaches the lower threshold value V2 is set to Tf. When the object moves to the left, that is, moves to the right in a drawing (b), the time T2 before output voltage reaches the lower threshold value V2 at first and subsequently reaches the upper threshold value V1 is set to T2 and the time before said voltage becomes the lower threshold value V2 or less from that point of time to again reach the upper threshold value V1 is set to Tb. Tf/T1<Tb/T2 is formed from the arrangement interval of the elements 11-14. Since the moving direction of the object is detected on the basis of a time ratio, erroneous operation due to noise is reduced. Since the elements 11-14 are connected in alternately inverse polarities, erroneous operation due to disturbance light or sudden temp. change can be prevented.
JP62202049A 1987-08-13 1987-08-13 Direction detecting type pyroelectric sensor Pending JPS6444884A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62202049A JPS6444884A (en) 1987-08-13 1987-08-13 Direction detecting type pyroelectric sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62202049A JPS6444884A (en) 1987-08-13 1987-08-13 Direction detecting type pyroelectric sensor

Publications (1)

Publication Number Publication Date
JPS6444884A true JPS6444884A (en) 1989-02-17

Family

ID=16451087

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62202049A Pending JPS6444884A (en) 1987-08-13 1987-08-13 Direction detecting type pyroelectric sensor

Country Status (1)

Country Link
JP (1) JPS6444884A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11248540A (en) * 1998-02-27 1999-09-17 Matsushita Electric Works Ltd Pyroelectric infrared detection element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11248540A (en) * 1998-02-27 1999-09-17 Matsushita Electric Works Ltd Pyroelectric infrared detection element

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