Vibration resistant quartz crystal resonators

Abstract : The principal objectives of this investigation were to provide doubly rotated quartz crystal resonators that exhibit low 'g' sensitivity on the order of 1 superscript 10 per 'g', and fast warm-up on the order of 1 superscript 9 in three minutes. Effects of changes in the mounting orientation have been investigated with respect to the magnitude of the acceleration sensitivity vector, for 0 angles of 21.95, 23.75 and 25.00, using 5 MHz/5th overtone plano-convex and bi-convex quartz crystal blanks. The mounting technique was three-point thermo-compression bonding; the mounts were 90 degrees apart. A new thermo-compression bonding ribbon was evaluated and instituted. 5 MHz and 10 MHz, third overtone crystals and 20 MHz fifth overtone crystals were measured for the magnitude of the acceleration sensitivity vector. Improved methods of x-ray orientation were also investigated. (Author)