FR2453413A1 - Intrusion detector for motor vehicle - utilises movement of mass acting on piezoelectric element to modulate transmission frequency - Google Patents

Intrusion detector for motor vehicle - utilises movement of mass acting on piezoelectric element to modulate transmission frequency

Info

Publication number
FR2453413A1
FR2453413A1 FR7908357A FR7908357A FR2453413A1 FR 2453413 A1 FR2453413 A1 FR 2453413A1 FR 7908357 A FR7908357 A FR 7908357A FR 7908357 A FR7908357 A FR 7908357A FR 2453413 A1 FR2453413 A1 FR 2453413A1
Authority
FR
France
Prior art keywords
piezoelectric element
movement
detector
mass
motor vehicle
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.)
Withdrawn
Application number
FR7908357A
Other languages
French (fr)
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.)
TAMBOISE MAURICE
Original Assignee
TAMBOISE MAURICE
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 TAMBOISE MAURICE filed Critical TAMBOISE MAURICE
Priority to FR7908357A priority Critical patent/FR2453413A1/en
Publication of FR2453413A1 publication Critical patent/FR2453413A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
    • G01P15/09—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up
    • G01P15/0907—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up of the compression mode type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P13/00—Indicating or recording presence, absence, or direction, of movement

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

The movement of an object is detected by movement of a mass acting on a piezoelectric element. This can modulate a carrier frequency for transmission to a controller which strikes a moving object. Such a detector acts as an anti theft device for a vehicle. A detector (1) comprises a piezoelectric element (5) which produces an electrical voltage when a mass activated by an intruder acts against it due to a change of direction or acceleration from a shock. The mass comprises a percussion element which slides in a fixed slide. The voltage is applied to the primary winding of a step up transformer (3) whose secondary winding is connected to a transmitter (4). The detector voltage amplitude modulates the transmitter output for emission by its antenna (16).
FR7908357A 1979-04-03 1979-04-03 Intrusion detector for motor vehicle - utilises movement of mass acting on piezoelectric element to modulate transmission frequency Withdrawn FR2453413A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7908357A FR2453413A1 (en) 1979-04-03 1979-04-03 Intrusion detector for motor vehicle - utilises movement of mass acting on piezoelectric element to modulate transmission frequency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7908357A FR2453413A1 (en) 1979-04-03 1979-04-03 Intrusion detector for motor vehicle - utilises movement of mass acting on piezoelectric element to modulate transmission frequency

Publications (1)

Publication Number Publication Date
FR2453413A1 true FR2453413A1 (en) 1980-10-31

Family

ID=9223885

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7908357A Withdrawn FR2453413A1 (en) 1979-04-03 1979-04-03 Intrusion detector for motor vehicle - utilises movement of mass acting on piezoelectric element to modulate transmission frequency

Country Status (1)

Country Link
FR (1) FR2453413A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0447560A1 (en) * 1989-10-06 1991-09-25 Takata Corporation Impact sensor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3667300A (en) * 1970-06-01 1972-06-06 Us Navy Accelerometer monitoring device
DE2143343A1 (en) * 1971-08-30 1973-03-15 August Woerl ALARM
US3727084A (en) * 1970-06-29 1973-04-10 Becton Dickinson Co Accelerometer utilizing shear responsive x-cut lithium niobate
US3735161A (en) * 1971-12-23 1973-05-22 Bell & Howell Co Piezoelectric transducer
US3984803A (en) * 1967-09-06 1976-10-05 The United States Of America As Represented By The United States Energy Research And Development Administration Seismic intrusion detector system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3984803A (en) * 1967-09-06 1976-10-05 The United States Of America As Represented By The United States Energy Research And Development Administration Seismic intrusion detector system
US3667300A (en) * 1970-06-01 1972-06-06 Us Navy Accelerometer monitoring device
US3727084A (en) * 1970-06-29 1973-04-10 Becton Dickinson Co Accelerometer utilizing shear responsive x-cut lithium niobate
DE2143343A1 (en) * 1971-08-30 1973-03-15 August Woerl ALARM
US3735161A (en) * 1971-12-23 1973-05-22 Bell & Howell Co Piezoelectric transducer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0447560A1 (en) * 1989-10-06 1991-09-25 Takata Corporation Impact sensor
EP0447560A4 (en) * 1989-10-06 1992-03-18 Takata Corporation Impact sensor

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Legal Events

Date Code Title Description
ST Notification of lapse