JPS56149813A - Elastic surface wave device - Google Patents

Elastic surface wave device

Info

Publication number
JPS56149813A
JPS56149813A JP5282380A JP5282380A JPS56149813A JP S56149813 A JPS56149813 A JP S56149813A JP 5282380 A JP5282380 A JP 5282380A JP 5282380 A JP5282380 A JP 5282380A JP S56149813 A JPS56149813 A JP S56149813A
Authority
JP
Japan
Prior art keywords
prevented
surface wave
insulating material
electric discharge
pyroelectric effect
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
JP5282380A
Other languages
Japanese (ja)
Inventor
Yoshifumi Toda
Noboru Wakatsuki
Toshiyuki Morita
Hideaki Ito
Kiyoaki Hodohara
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP5282380A priority Critical patent/JPS56149813A/en
Publication of JPS56149813A publication Critical patent/JPS56149813A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02818—Means for compensation or elimination of undesirable effects
    • H03H9/02921—Measures for preventing electric discharge due to pyroelectricity

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

PURPOSE:To prevent electric discharge of the element and caused by a pyroelectric effect, by coating the surface and the side of an elastic surface wave element which is used for the filter of VHF and UHF bands, etc., with an insulator. CONSTITUTION:The surface (the surface of the grid electrode 18 is also included) and the side of the elastic surface wave element 17 mounted on the bottom plate 16a of the metallic case 16 are coated with an insulating material 19. This insulating material 19 consists of an inorganic material such as SiO2, or an organic material such as polyamide resin, and SiO2, etc. are formed to several mum in thickness by means of vacuum deposition or sputtering. According to said constitution, the electric charge which has charged the surface of the element 17 due to a pyroelectric effect is shut off from air by the insulating material 19, electric discharge to the bottom plate 16a is prevented, also electric discharge to the grid electrode 18 is prevented, and generation of a noise caused by a pyroelectric effect is prevented.
JP5282380A 1980-04-23 1980-04-23 Elastic surface wave device Pending JPS56149813A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5282380A JPS56149813A (en) 1980-04-23 1980-04-23 Elastic surface wave device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5282380A JPS56149813A (en) 1980-04-23 1980-04-23 Elastic surface wave device

Publications (1)

Publication Number Publication Date
JPS56149813A true JPS56149813A (en) 1981-11-19

Family

ID=12925564

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5282380A Pending JPS56149813A (en) 1980-04-23 1980-04-23 Elastic surface wave device

Country Status (1)

Country Link
JP (1) JPS56149813A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61208916A (en) * 1985-03-13 1986-09-17 Murata Mfg Co Ltd Method for adjusting frequency of surface wave device
JPH02116211A (en) * 1988-10-26 1990-04-27 Fujitsu Ltd Piezo-electric element
US5446329A (en) * 1992-09-14 1995-08-29 Sumitomo Electric Industries, Ltd. Surface acoustic wave element
US5889446A (en) * 1996-01-19 1999-03-30 Nec Corporation Surface acoustic wave device with a resistor thin film to remove pyroelectric effect charges
US6720845B2 (en) * 2000-11-09 2004-04-13 Nrs Technologies Inc. Saw filter device and package for accommodating the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61208916A (en) * 1985-03-13 1986-09-17 Murata Mfg Co Ltd Method for adjusting frequency of surface wave device
JPH02116211A (en) * 1988-10-26 1990-04-27 Fujitsu Ltd Piezo-electric element
US5446329A (en) * 1992-09-14 1995-08-29 Sumitomo Electric Industries, Ltd. Surface acoustic wave element
US5889446A (en) * 1996-01-19 1999-03-30 Nec Corporation Surface acoustic wave device with a resistor thin film to remove pyroelectric effect charges
US6720845B2 (en) * 2000-11-09 2004-04-13 Nrs Technologies Inc. Saw filter device and package for accommodating the same

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