Piezoelectric resonance device

• US 3,141,100 A
• Filed: 06/21/1962
• Issued: 07/14/1964
• Est. Priority Date: 06/21/1962
• Status: Expired due to Term

• Current Assignee: Gordon Hart Thomas
• Original Assignee: Gordon Hart Thomas
• Inventors: GORDON HART THOMAS
• Application Number:
  US04/204,196
• Time in Patent Office: 754 Days
• US Class Current: 310/323.01
• CPC Class Codes: G01C 19/5642 using vibrating bars or beams
• CPC Class Codes: H03H 9/545 including active elements
• CPC Class Codes: H03H 9/58 Multiple crystal filters

Claims

1. IN A MECHANICAL RESONANCE DEVICE THE COMBINATION COMPRISING:

(A) AT LEAST ONE PAIR OF SUBSTANTIALLY IDENTICAL CRYSTAL QUARTZ PRISMATIC MEMBERS HAVING SUBSTANTIALLY RECTANGULAR END FACES, SAID MEMBERS BEING DISPOSED IN PARALLEL AND OPPOSITE RELATIONSHIP WITH RESPECT TO EQUAL SIDE FACES;

AND (B) CRYSTAL QUARTZ CONSTRAINING MEANS IN ABUTTING RELATIONSHIP WITH SAID EQUAL SIDE FACES SUBSTANTIALLY EQUIDISTANT FROM THE ENDS OF THE SAID MEMBERS, THE SURFACES OF SAID CRYSTAL QUARTZ CONSTRAINING MEANS BEING ORIENTED WITH RESPECT TO THE CRYSTAL AXES AND WITH RESPECT TO SAID MEMBERS TO SUBSTANTIALLY MATCH THE COEFFICIENTS OF EXPANSION OF SAID CONSTRAINING MEANS AND SAID MEMBERS AT THEIR ABUTTING SURFACES, SAID PRISMATIC MEMBERS AND SAID CONSTRAINING MEANS IN COMBINATION SUPPORTING A RESONANCE CONDITION WHERE IN THE UNCONSTRAINED PORTIONS OF SAID MEMBERS ARE IN SUBSTANTIALLY BALANCED FLEXURAL MOTION AND SAID CONSTRAINING MEANS IS SUBJECTED TO SUBSTANTIALLY ONLY COMPRESSIONAL AND EXTENSIONAL FORCES.