H - Electricity – 03 – B
Patent
H - Electricity
03
B
331/53
H03B 5/32 (2006.01) H03H 9/08 (2006.01) H03L 1/04 (2006.01)
Patent
CA 1131321
ABSTRACT OF THE DISCLOSURE An oven controlled oscillator assembly is described which has an evacuated enclosure, and a piezoelectric crystal plate within that enclosure. Mounting means are provided for thermally insulating the crystal plate. The enclosure has at least one lid which includes an infrared transmitting window, and an infrared source in close proximity outside of the enclosure to emit radiation through the window to the crystal plate. A reflector is mounted as a dome over that window, with the infrared source being positioned between the window and the reflector. The emitted radiation is of a wavelength absorbable by the crystal plate. Also provided are temperature sensing means on the crystal plate, and temperature control circuitry for controlling radiation emitted from the infrared source so as to maintain the crystal plate at a predetermined temperature. The oscillator assembly further includes oscillator circuitry and means for thermally insulating the crystal plate and oscillator circuitry from the environment outside of the assembly. This configuration provides an oscillator assembly that has both a very small thermal time constant for fast warmup of the crystal plate, and a very large thermal time constant giving insensitivity to external environmental changes. In one embodiment the enclosure is an oven enclosure provided with a piezo- electric crystal resonator therein. In another embodiment the enclosure is a crystal enclosure with a crystal resonator provided therein. In another preferred embodiment electrically conductive thin film strips form electrode tabs to the crystal plate. The tabs are oriented to minimize thermal transient effects caused by anisotropic heating due to the difference in absorbance between electrodes on which the tabs are formed and the crystal.
336782
Aspila Kalevi P.
The Government Of The United States As Represented By The Secret
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