An oscillator in the form of a pair of parallel resilient arms joined at one end and free at the other end. The arms oscillate in counterphase and each has a mass element on the free end so disposed thereon as to counterbalance the torque about a line between the arms which is developed by oscillation of the arms. At the free ends of the arms one thereof has associated therewith a driver for driving the arms, while the same, or the other arm, has a device thereon for imparting motion to a driven member, such as the input member for a clockwork.
An electrically driven tuning fork of the piezoelectric type, electromagnetic type or the like for use in electrical and electronic equipment which includes a tuning fork vibrator and electrical elements for driving the tuning fork vibrator. The two-pronged tuning fork vibrator has a pair of rectangular projections integrally formed with the prongs on corresponding side edges of the said prongs at one side of the tuning fork, excepting opposite end portions of the prongs adjacent to the node and in same embodiments, both the mode and antinode of the fundamental harmonic oscillation of the tuning fork for suppressing undesirable oscillation other than the fundamental harmonic oscillation of the tuning fork. Electrical elements are affixed onto the outer or inner surfaces of the prongs.
