Damped cradle for SAW device

A damped cradle (22) for a pressure sensitive device (10) is constructed in a unitary form. The cradle has a base that is attached to a substrate (15). Extending upward from the base are side arms (24) with pairs of spring, or compliant, tips (25) that contact the sides of the pressure sensitive dev...

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Bibliographic Details
Main Authors SANG, EMMANUEL, GRELLMANN, HEINZ E
Format Patent
LanguageEnglish
French
German
Published 05.06.1991
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS
MEASURING
MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE
PHYSICS
RESONATORS
TESTING
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Summary:A damped cradle (22) for a pressure sensitive device (10) is constructed in a unitary form. The cradle has a base that is attached to a substrate (15). Extending upward from the base are side arms (24) with pairs of spring, or compliant, tips (25) that contact the sides of the pressure sensitive device. Also extending upward from the base over the top of the pressure sensitive device are spring arms (26) with compliant tips (27) that contact the top surface of the pressure sensitive device in non-active areas. Vibrational forces in lateral (X-Y plane) directions are damped by friction between the bottom of the pressure sensitive device and the surface of the substrate, and vibration motion in the vertical, or Z, direction is stopped by enough spring force to overcome the maximum acceleration force the crystal mass encompasses for a given application. The spring forces of the spring tips and spring arms are balanced to produce a near zero pressure on the pressure sensitive device in both static and dynamic modes.
Bibliography:Application Number: EP19900312895