FR2431189A1 - Polarised piezoelectric ceramic crystal - has varying polarisation applied to give required characteristics for varying focal length of mirror - Google Patents

Polarised piezoelectric ceramic crystal - has varying polarisation applied to give required characteristics for varying focal length of mirror

Info

Publication number
FR2431189A1
FR2431189A1 FR7820494A FR7820494A FR2431189A1 FR 2431189 A1 FR2431189 A1 FR 2431189A1 FR 7820494 A FR7820494 A FR 7820494A FR 7820494 A FR7820494 A FR 7820494A FR 2431189 A1 FR2431189 A1 FR 2431189A1
Authority
FR
France
Prior art keywords
crystal
varying
piezoelectric ceramic
mirror
focal length
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.)
Granted
Application number
FR7820494A
Other languages
French (fr)
Other versions
FR2431189B3 (en
Inventor
Guy Michelet
Georges Bret
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.)
Quantel SA
Original Assignee
Quantel SA
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 Quantel SA filed Critical Quantel SA
Priority to FR7820494A priority Critical patent/FR2431189A1/en
Publication of FR2431189A1 publication Critical patent/FR2431189A1/en
Application granted granted Critical
Publication of FR2431189B3 publication Critical patent/FR2431189B3/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
    • H10N30/204—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using bending displacement, e.g. unimorph, bimorph or multimorph cantilever or membrane benders
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/01—Manufacture or treatment
    • H10N30/04—Treatments to modify a piezoelectric or electrostrictive property, e.g. polarisation characteristics, vibration characteristics or mode tuning
    • H10N30/045—Treatments to modify a piezoelectric or electrostrictive property, e.g. polarisation characteristics, vibration characteristics or mode tuning by polarising

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Insulating Materials (AREA)

Abstract

In the process for polarising a piezoelectric ceramic crystal (1), a block of dielectric constant equal to that of the crystal is placed in contact with the upper surface of the crystal. An electrode layer (2) is formed on the under surface of the crystal. The dielectric block, which is a solid of revolution, is stepped, being thickest at its centre, and thinnest at the edges. Three separate conductive layers (7, 8, 9) are applied to the steps of the block, so as to form capacitors with the lower conductive layer. A voltage is applied between the upper and lower conductive layers to create inhomogeneous polarisation in the piezoelectric crystal. The crystal is used for electrically controlled, variable focus mirrors.
FR7820494A 1978-07-10 1978-07-10 Polarised piezoelectric ceramic crystal - has varying polarisation applied to give required characteristics for varying focal length of mirror Granted FR2431189A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7820494A FR2431189A1 (en) 1978-07-10 1978-07-10 Polarised piezoelectric ceramic crystal - has varying polarisation applied to give required characteristics for varying focal length of mirror

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7820494A FR2431189A1 (en) 1978-07-10 1978-07-10 Polarised piezoelectric ceramic crystal - has varying polarisation applied to give required characteristics for varying focal length of mirror

Publications (2)

Publication Number Publication Date
FR2431189A1 true FR2431189A1 (en) 1980-02-08
FR2431189B3 FR2431189B3 (en) 1981-03-27

Family

ID=9210535

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7820494A Granted FR2431189A1 (en) 1978-07-10 1978-07-10 Polarised piezoelectric ceramic crystal - has varying polarisation applied to give required characteristics for varying focal length of mirror

Country Status (1)

Country Link
FR (1) FR2431189A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3334091A1 (en) * 1982-09-22 1984-03-22 North American Philips Corp., 10017 New York, N.Y. METHOD FOR PRODUCING AN APODIZED ULTRASONIC TRANSDUCER
US5350964A (en) * 1990-02-28 1994-09-27 Fujitsu Limited Ultrasonic transducer and method of manufacturing the same
US5589725A (en) * 1993-02-23 1996-12-31 Research Corporation Tech., Inc. Monolithic prestressed ceramic devices and method for making same
US6191524B1 (en) * 1998-06-09 2001-02-20 Matsushita Electric Industrial Co., Ltd. Piezoelectric vibrators

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3334091A1 (en) * 1982-09-22 1984-03-22 North American Philips Corp., 10017 New York, N.Y. METHOD FOR PRODUCING AN APODIZED ULTRASONIC TRANSDUCER
US5350964A (en) * 1990-02-28 1994-09-27 Fujitsu Limited Ultrasonic transducer and method of manufacturing the same
US5589725A (en) * 1993-02-23 1996-12-31 Research Corporation Tech., Inc. Monolithic prestressed ceramic devices and method for making same
US6191524B1 (en) * 1998-06-09 2001-02-20 Matsushita Electric Industrial Co., Ltd. Piezoelectric vibrators

Also Published As

Publication number Publication date
FR2431189B3 (en) 1981-03-27

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