JPS5463651A - Elastic surface wave device - Google Patents

Elastic surface wave device

Info

Publication number
JPS5463651A
JPS5463651A JP12961577A JP12961577A JPS5463651A JP S5463651 A JPS5463651 A JP S5463651A JP 12961577 A JP12961577 A JP 12961577A JP 12961577 A JP12961577 A JP 12961577A JP S5463651 A JPS5463651 A JP S5463651A
Authority
JP
Japan
Prior art keywords
elastic surface
surface waves
screen type
type electrode
center
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
JP12961577A
Other languages
Japanese (ja)
Other versions
JPS6114688B2 (en
Inventor
Jun Yamada
Takeshi Hazama
Yoshihiko Noro
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP12961577A priority Critical patent/JPS5463651A/en
Publication of JPS5463651A publication Critical patent/JPS5463651A/en
Publication of JPS6114688B2 publication Critical patent/JPS6114688B2/ja
Granted 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
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14544—Transducers of particular shape or position
    • H03H9/14547—Fan shaped; Tilted; Shifted; Slanted; Tapered; Arched; Stepped finger transducers
    • 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
    • H03H9/02881—Means for compensation or elimination of undesirable effects of diffraction of wave beam
    • 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
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14544—Transducers of particular shape or position
    • 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
    • H03H9/125—Driving means, e.g. electrodes, coils
    • H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
    • H03H9/14517—Means for weighting
    • H03H9/1452—Means for weighting by finger overlap length, apodisation

Landscapes

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

Abstract

PURPOSE:To reduce diffraction effects to obtain a good frequency characteristic by giving a cask shape to one part of a reed screen type electrode, at least, and centralizing elastic surface waves to the center. CONSTITUTION:This device is constituted by reed screen type electrode 2 to convert electric signals to elastic surface waves, materials 3 to propagate elastic surface waves generated by electrode 2, and reed screen type electrode 4 to convert elastic surface waves to electric signals again. In this case, one part, at least, of the reed screen type electrode has cask shape 9. As a result, the distribution of thick electrode width can be provided at the center, and elastic surface waves are centralized to the center to reduce diffraction effects, so that a good frequency characteristic can be obtained.
JP12961577A 1977-10-31 1977-10-31 Elastic surface wave device Granted JPS5463651A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12961577A JPS5463651A (en) 1977-10-31 1977-10-31 Elastic surface wave device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12961577A JPS5463651A (en) 1977-10-31 1977-10-31 Elastic surface wave device

Publications (2)

Publication Number Publication Date
JPS5463651A true JPS5463651A (en) 1979-05-22
JPS6114688B2 JPS6114688B2 (en) 1986-04-19

Family

ID=15013835

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12961577A Granted JPS5463651A (en) 1977-10-31 1977-10-31 Elastic surface wave device

Country Status (1)

Country Link
JP (1) JPS5463651A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57199316A (en) * 1981-06-01 1982-12-07 Maruyasu Kogyo Kk Surface acoustic wave filter
JPH02170610A (en) * 1988-12-23 1990-07-02 Hitachi Ltd Surface acoustic wave device
US7170372B2 (en) * 2001-07-24 2007-01-30 Epcos Ag Converter for surface waves with improved suppression of interfering excitation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57199316A (en) * 1981-06-01 1982-12-07 Maruyasu Kogyo Kk Surface acoustic wave filter
JPH02170610A (en) * 1988-12-23 1990-07-02 Hitachi Ltd Surface acoustic wave device
US7170372B2 (en) * 2001-07-24 2007-01-30 Epcos Ag Converter for surface waves with improved suppression of interfering excitation

Also Published As

Publication number Publication date
JPS6114688B2 (en) 1986-04-19

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