B06BMETHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL for particular applications, see the relevant subclasses, e.g. B07B1/40, B23Q17/12, B24B31/06; measurement of mechanical vibrations G01H; in direction finding, locating, distance or velocity measuring G01S; generating seismic energy G01V1/02; control of mechanical vibrations in general G05D; sound-producing devices, e.g. bells, sirens, whistles G10K, e.g. methods or devices for transmitting, conducting, or directing sound in general G10K11/00; generation of electrical oscillations H03B; electromechanical resonators in general H03H; electromechanical transducers for communication techniques, e.g. microphones, speakers H04RIn this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme. B06B1/00 B06B1/00Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency B06B1/02making use of electrical energy B06B1/18, B06B1/20 take precedence B06B1/0207Driving circuits specially adapted for particular applications, see the relevant subclass, e.g. G01; circuits for steering transducer arrays G10K11/34; basic circuits H03 B06B1/0215for generating pulses, e.g. bursts of oscillations, envelopes B06B1/0223for generating signals continuous in time B06B1/023and stepped in amplitude, e.g. square wave, 2-level signal B06B1/0238of a single frequency, e.g. a sine-wave B06B1/0246with a feedback signal B06B1/0253taken directly from the generator circuit B06B1/0261taken from a transducer or electrode connected to the driving transducer B06B1/0269for generating multiple frequencies B06B1/0276with simultaneous generation, e.g. with modulation, harmonics B06B1/0284with consecutive, i.e. sequential generation, e.g. with frequency sweep B06B1/0292Electrostatic transducers, e.g. electret-type B06B1/04operating with electromagnetism dynamo-electric motors with vibrating magnet, armature or coil system H02K33/00 B06B1/045using vibrating magnet, armature or coil system B06B1/06operating with piezo-electric effect or with electrostriction piezo-electric or electrostrictive devices per se H10N30/00 B06B1/0603using a piezo-electric bender, e.g. bimorph B06B1/0607using multiple elements B06B1/064 and B06B1/0688 take precedence B06B1/0611in a pile B06B1/0614for generating several frequencies B06B1/0618of piezo- and non-piezo-electric elements, e.g. 'Tonpilz' B06B1/0622on one surface B06B1/0625Annular array B06B1/0629Square array B06B1/0633Cylindrical array B06B1/0637Spherical array B06B1/064with multiple active layers B06B1/0644using a single piezo-electric element B06B1/0688 takes precedence B06B1/0648of rectangular shape B06B1/0651of circular shape B06B1/0655of cylindrical shape B06B1/0659of U-shape B06B1/0662with an electrode on the sensitive surface B06B1/0666used as a diaphragm B06B1/067which is used as, or combined with, an impedance matching layer B06B1/0674and a low impedance backing, e.g. air B06B1/0677and a high impedance backing B06B1/0681and a damping structure B06B1/0685on the back only of piezo-electric elements B06B1/0688with foil-type piezo-electric elements, e.g. PVDF B06B1/0692with a continuous electrode on one side and a plurality of electrodes on the other side B06B1/0696with a plurality of electrodes on both sides B06B1/08operating with magnetostriction magnetostrictive devices per se H10N30/00 B06B1/085using multiple elements, e.g. arrays B06B1/10making use of mechanical energy B06B1/18, B06B1/20 take precedence B06B1/12operating with systems involving reciprocating masses B06B1/14the masses being elastically coupled B06B1/16operating with systems involving rotary unbalanced masses electrical motors using rotary unbalanced masses in general H02K7/061 B06B1/161Adjustable systems, i.e. where amplitude or direction of frequency of vibration can be varied B06B1/162Making use of masses with adjustable amount of eccentricity B06B1/163the amount of eccentricity being only adjustable when the system is stationary B06B1/165 takes precedence B06B1/164the amount of eccentricity being automatically variable as a function of the running condition, e.g. speed, direction B06B1/165 takes precedence B06B1/165with fluid masses or the like B06B1/166Where the phase-angle of masses mounted on counter-rotating shafts can be varied, e.g. variation of the vibration phase B06B1/167Orbital vibrators having masses being driven by planetary gearings, rotating cranks or the like B06B1/168Rotary pendulum vibrators B06B1/18wherein the vibrator is actuated by pressure fluid B06B1/20 takes precedence B06B1/183operating with reciprocating masses B06B1/186operating with rotary unbalanced masses B06B1/20making use of a vibrating fluid whistles or sirens per se G10K B06B3/00Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency B06B3/02involving a change of amplitude B06B3/04involving focusing or reflecting B06B2201/00 B06B2201/00Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups B06B2201/20Application to multi-element transducer B06B2201/30with electronic damping B06B2201/40with testing, calibrating, safety devices, built-in protection, construction details B06B2201/50Application to a particular transducer type B06B2201/51Electrostatic transducer B06B2201/52Electrodynamic transducer B06B2201/53with vibrating magnet or coil B06B2201/54Electromagnetic acoustic transducers [EMAT] B06B2201/55Piezoelectric transducer B06B2201/56Foil type, e.g. PVDF B06B2201/57Electrostrictive transducer B06B2201/58Magnetostrictive transducer B06B2201/70Specific application B06B2201/71Cleaning in a tank B06B2201/72Welding, joining, soldering B06B2201/73Drilling B06B2201/74Underwater B06B2201/75Repelling animals, insects, humans B06B2201/76Medical, dental B06B2201/77Atomizers