Patent ID: 7535159
Filing Date: 2009-05-19
Classification: H03H,Y10T

Abstract:
1. A tuning fork crystal oscillation plate comprising: a tuning fork crystal oscillation piece including a base with a substantially rectangular shape when seen from the top, and at least two oscillation arms extending in the same direction from one side of said base and having substantially rectangular shapes when seen from the top, said at least two oscillation arms including first and second oscillation arms; first and second grooves which are formed in one main surface of said first oscillation arm and one main surface of said second oscillation arm on the same side, said first groove and said second groove extending from a boundary line of said base with said first and second oscillation arms toward distal ends of said first oscillation arm and said second oscillation arm, said first groove and said second groove having a length that falls within a range of 50% (inclusive) to 70% (exclusive) a length of said first oscillation arm and said second oscillation arm, and said first groove and said second groove having a depth that falls within a range of 50% to 90% (both inclusive) a thickness of said tuning fork crystal oscillation piece; first and second groove electrodes which are formed on inner surfaces of said first and second grooves, respectively first side surface electrodes which are formed on two side surfaces, respectively, of said first oscillation arm; and second side surface electrodes which are formed on two side surfaces, respectively, of said second oscillation arm, wherein said first groove electrode is connected to said second side surface electrodes to constitute one terminal, and said second groove electrode is connected to said first side surface electrodes to constitute the other terminal.