Resources Contact Us Home
Cut angles for tuning fork type quartz resonators

Image Number 3 for United States Patent #4503353.

Axes X', Y' and Z' of a resonator are established from the axes X, Y and Z of a quartz crystal by virtue of two rotational movements through angles .phi. and .theta., respectively. The resonator is energized to vibrate in accordance with the fundamental torsional mode. The angles of cut .phi. and .theta. are such that the first-order temperature coefficient is zero. The torsional mode may be coupled to a flexural mode in order to render the second-order temperature coefficient zero. The fork tines extend in the X' direction. In other embodiments the tines extend in the Y' direction and the rotation .phi. and .theta. are about the X and Z' axes, respectively.

  Recently Added Patents
Method of treating lung cancer
Control unit of a ride level control system, and ride level control system
Methods, systems, and physical computer storage media for processing a plurality of input/output request jobs
Managing delivery of application server content
Multibranched polymer and method for producing the same
Apparatus and method for information display of portable device
Magnifying glass
  Randomly Featured Patents
High refractive index glass compositions
Image forming apparatus
Radiation resistant integrated circuit design
Method and apparatus for measuring the barrier height distribution in an insulated gate field effect transistor
Probe with curved bar for an echograph
Method and system for computer-implemented trading of secondary market debt securities
Portion of a drawer of a service cart
Collapsible shipping container having reinforced base element
Plenum type air distribution system for head enclosure
Device for metering liquids