EP 0343403 B1 19930908 - CIRCUIT FOR THE SELF-EXCITATION OF A MECHANICAL OSCILLATION SYSTEM TO ITS CHARACTERISTIC RESONANT FREQUENCY
Title (en)
CIRCUIT FOR THE SELF-EXCITATION OF A MECHANICAL OSCILLATION SYSTEM TO ITS CHARACTERISTIC RESONANT FREQUENCY
Publication
Application
Priority
DE 3815007 A 19880503
Abstract (en)
[origin: WO8910802A1] Circuitry for self-excitation of self-resonant vibrations in a mechanical vibrating system (10) comprises an electromechanical transducer system (20) arranged in the feedback circuit of an electrical amplifier circuit (30) so that mechanical vibrations are induced in the system by the output alternating voltage of the amplifier circuit (30) and the system supplies an alternating voltage having the frequency of the mechanical vibrations to the input of the amplifier circuit (30). The amplifier circuit (30) has a non-linear amplification characteristic curve, which results in greater amplification at lower values of the input signal than at higher values. This ensures reliable vibration even under unfavorable operating conditions, while reducing the risk of false indications concerning the state of vibration, for example due to foreign vibrations.
IPC 1-7
IPC 8 full level
B06B 1/02 (2006.01); G01F 23/28 (2006.01)
CPC (source: EP US)
B06B 1/0261 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE ES FR GB IT LI NL
DOCDB simple family (publication)
EP 0343403 A1 19891129; EP 0343403 B1 19930908; DE 58905505 D1 19931014; ES 2042865 T3 19931216; JP H02502267 A 19900726; JP H0775700 B2 19950816; US 5029268 A 19910702; WO 8910802 A1 19891116
DOCDB simple family (application)
EP 89107994 A 19890503; DE 58905505 T 19890503; DE 8900281 W 19890503; ES 89107994 T 19890503; JP 50486689 A 19890503; US 45541789 A 19890227