B:	PERFORMING OPERATIONS; TRANSPORTING
B06:	GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
B06B:	METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
B06B1/00:	Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
B06B1/02:	. making use of electrical energy
B06B1/02D:	. . Driving circuits specially adapted for particular applications, see the relevant subclass, e.g. G01; circuits for steering transducer arrays G10K11/34; basic circuits H03
B06B1/02D2:	. . . for generating pulses, e.g. bursts of oscillations, envelopes
B06B1/02D3:	. . . for generating signals continuous in time
B06B1/02D3B:	. . . . and stepped in amplitude, e.g. square wave, 2-level signal
B06B1/02D3C:	. . . . of a single frequency, e.g. a sine-wave
B06B1/02D3C2:	. . . . . with a feedback signal
B06B1/02D3C2B:	. . . . . . taken directly from the generator circuit
B06B1/02D3C2C:	. . . . . . taken from a transducer or electrode connected to the driving transducer
B06B1/02D3D:	. . . . for generating multiple frequencies
B06B1/02D3D2:	. . . . . with simultaneous generation, e.g. with modulation, harmonics
B06B1/02D3D3:	. . . . . with consecutive, i.e. sequential generation, e.g. with frequency sweep
B06B1/02E:	. . Electrostatic transducers, e.g. electret-type
B06B1/04:	. . operating with electromagnetism
B06B1/04B:	. . . using vibrating magnet, armature or coil sytem
B06B1/06:	. . operating with piezo-electric effect or with electrostriction
B06B1/06B:	. . . using a piezo-electric bender, e.g. bimorph
B06B1/06C:	. . . using multiple elements B06B1/06C3E and B06B1/06F take precedence
B06B1/06C2:	. . . . in a pile
B06B1/06C2B:	. . . . . for generating several frequencies
B06B1/06C2C:	. . . . . of piezo- and non-piezo-electric elements, e.g. `Tonpilz`
B06B1/06C3:	. . . . on one surface
B06B1/06C3A:	. . . . . Annular array
B06B1/06C3B:	. . . . . Square array
B06B1/06C3C:	. . . . . Cylindrical array
B06B1/06C3D:	. . . . . Spherical array
B06B1/06C3E:	. . . . . with multiple active layers
B06B1/06E:	. . . using a single piezo-electric element B06B1/06F takes precedence
B06B1/06E2:	. . . . of rectangular shape
B06B1/06E3:	. . . . of circular shape
B06B1/06E4:	. . . . of cylindrical shape
B06B1/06E5:	. . . . of U-shape
B06B1/06E6:	. . . . with an electrode on the sensitive surface
B06B1/06E6B:	. . . . . used as a diaphragm
B06B1/06E6C:	. . . . . which is used as, or combined with, an impedance matching layer
B06B1/06E6D:	. . . . . and a low impedance backing, e.g. air
B06B1/06E6E:	. . . . . and a high impedance backing
B06B1/06E6F:	. . . . . and a damping structure
B06B1/06E6F2:	. . . . . . on the back only of piezo-electric elements
B06B1/06F:	. . . with foil-type piezo-electric elements, e.g. PVDF
B06B1/06F2:	. . . . with a continuous electrode on one side and a plurality of electrodes on the other side
B06B1/06F3:	. . . . with a plurality of electrodes on both sides
B06B1/08:	. . operating with magnetostriction
B06B1/08B:	. . . using multiple elements, e.g. arrays
B06B1/10:	. making use of mechanical energy
B06B1/12:	. . operating with systems involving reciprocating masses
B06B1/14:	. . . the masses being elastically coupled
B06B1/16:	. . operating with systems involving rotary unbalanced masses electrical motors using rotary unbalanced masses in general H02K7/06B
B06B1/16B:	. . . Adjustable systems, i.e. where amplitude or direction of frequency of vibration can be varied
B06B1/16B2:	. . . . Making use of masses with adjustable amount of eccentricity
B06B1/16B2B:	. . . . . the amount of eccentricity being only adjustable when the system is stationary B06B1/16B2E takes precedence
B06B1/16B2D:	. . . . . the amount of eccentricity being automatically variable as a function of the running condition, e.g. speed, direction B06B1/16B2E takes precedence
B06B1/16B2E:	. . . . . with fluid masses or the like
B06B1/16B4:	. . . . Where the phase-angle of masses mounted on counter-rotating shafts can be varied, e.g. variation of the vibration phase
B06B1/16C:	. . . Orbital vibrators having masses being driven by planetary gearings, rotating cranks or the like
B06B1/16C1:	. . . . Rotary pendulum vibrators
B06B1/18:	. wherein the vibrator is actuated by pressure fluid
B06B1/18B:	. . operating with reciprocating masses
B06B1/18C:	. . operating with rotary unbalanced masses
B06B1/20:	. making use of a vibrating fluid whistles or sirens per se G10K
B06B3/00:	Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency [M1112]
B06B3/02:	. involving a change of amplitude
B06B3/04:	. involving focusing or reflecting