Kyocera Corporation

Kyocera Crystal Device Corporation

Kouhei Sasaoka

Masahiko Goto

A vibration element includes a crystal blank, a pair of excitation electrodes, and pair of extraction electrodes. The crystal blank is an AT cut crystal blank including a mesa part and an outer circumferential part which is thinner than the mesa part and surrounds the mesa part. The pair of excitation electrodes is provided on the two major surfaces of the mesa part. The pair of extraction electrodes include pad parts which are provided at the end parts of the crystal blank in the longitudinal direction on one major surface of the outer circumferential part and are connected to the pair of excitation electrodes. The length in the longitudinal direction of the crystal blank is less than 1000 &#x3bc;m. When the resonance frequency is F (MHz) and t=1670/F, the distance 'y' (&#x3bc;m) between each of the pad parts and the mesa part satisfies 0.048F+1.18&#x3c;y/t&#x3c;0.097F+0.36.

Crystal vibration element and crystal vibration device

A crystal device has a crystal blank, a first excitation electrode part which is provided on an upper surface of the crystal blank, a first wiring part which extends from the first excitation electrode part to an edge part of the upper surface, a first lead-out terminal which is provided at the edge part of the upper surface of the crystal blank, a first mounting terminal which is provided at a position facing the first lead-out terminal, a first connection part which is provided so that one end is superimposed on the first lead-out terminal and the other end is superimposed on the first mounting terminal, a substrate having a mounting pad which is provided on its upper surface, a conductive adhesive which is provided between the mounting pad and the first mounting terminal, and a lid which is bonded to the upper surface of the substrate.

Growing community of inventors

Higashine, Japan

Kouhei Sasaoka