JPS52407A - Low noise underwater mike - Google Patents

Low noise underwater mike

Info

Publication number
JPS52407A
JPS52407A JP7571175A JP7571175A JPS52407A JP S52407 A JPS52407 A JP S52407A JP 7571175 A JP7571175 A JP 7571175A JP 7571175 A JP7571175 A JP 7571175A JP S52407 A JPS52407 A JP S52407A
Authority
JP
Japan
Prior art keywords
mike
low noise
underwater
noise underwater
depolarization
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
JP7571175A
Other languages
Japanese (ja)
Inventor
Masatada Fukushima
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 JP7571175A priority Critical patent/JPS52407A/en
Publication of JPS52407A publication Critical patent/JPS52407A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/02—Microphones

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

PURPOSE:To eliminate noises due to parallel movement of an underwater mike by forming hollow sections so that drags applied to two sets of piezoelectric elements disPosed in the same direction of depolarization become equal to each other.
JP7571175A 1975-06-23 1975-06-23 Low noise underwater mike Pending JPS52407A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7571175A JPS52407A (en) 1975-06-23 1975-06-23 Low noise underwater mike

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7571175A JPS52407A (en) 1975-06-23 1975-06-23 Low noise underwater mike

Publications (1)

Publication Number Publication Date
JPS52407A true JPS52407A (en) 1977-01-05

Family

ID=13584082

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7571175A Pending JPS52407A (en) 1975-06-23 1975-06-23 Low noise underwater mike

Country Status (1)

Country Link
JP (1) JPS52407A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5387809A (en) * 1977-01-10 1978-08-02 Ploeger Walter Jr Printing ribbon spool
JPS55123489A (en) * 1978-12-20 1980-09-22 Ibex Inking Syst Method of supplying ink to ribbon spool for printing and ribbon

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5387809A (en) * 1977-01-10 1978-08-02 Ploeger Walter Jr Printing ribbon spool
JPS55123489A (en) * 1978-12-20 1980-09-22 Ibex Inking Syst Method of supplying ink to ribbon spool for printing and ribbon

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