公开(公告)号：SE369106B

公开(公告)日：1974-08-05

申请号：SE454171

申请日：1971-04-07

Applicant: AMLAB AB

Inventor： WESTBERG B ,  DUREN L

IPC: F42B19/10

公开(公告)号：SE339346B

公开(公告)日：1971-10-04

申请号：SE340569

申请日：1969-03-12

Applicant: AMLAB AB

Inventor： DUREN L ,  ANDERSSON A

IPC: B06B1/02 ,  B06B1/06 ,  B06B1/08

Abstract: An ultrasonic generator including an amplifier coupled in oscillator configuration for initiating via an exciting impedance ultrasonic vibrations in an electro-acoustic element such as that associated with a dental instrument. Connected in parallel with the exciting impedance in an additional impedance to form a tuned parallel resonance circuit. Maximum current is supplied to the exciting impedance through the amplifier and the primary winding of a current transformer also having a secondary winding connected in series with a capacitor to form a tuned series resonance circuit additionally emphasizing the maximum current. The transformer forms an inductive coupling in phase-aiding relationship between the output circuit of the amplifier and the control electrode thereof for continuously maintaining optimal effect at the prevailing resonance frequency with an automatic adaptation of the oscillation frequency to variations from the nominal mechanical resonance frequency of the electro-acoustic element.

公开(公告)号：SE320431B

公开(公告)日：1970-02-09

申请号：SE175969

申请日：1969-02-10

Applicant: AMLAB AB

Inventor： ANDERSSON A ,  DUREN L

IPC: A61C1/00 ,  H01H36/00