Patent ID: 8289089

Claim:
A surface mount crystal oscillator comprising a crystal piece held by first and second crystal holding terminals on a rectangular ceramic substrate, wherein one leading electrode and the other leading electrode of the crystal piece are led in opposite directions, the first crystal holding terminal and the second crystal holding terminal constitute such a both-ends holding type as to hold both ends of the crystal piece, on wall faces of through holes formed in corner portions of the substrate, through terminals are formed, on the front surface of the substrate, a first leading terminal led from the first crystal holding terminal is connected to the through terminal of the shortest corner portion, and a second leading terminal led from the second crystal holding terminal is connected to the through terminal of the corner portion in a direction reverse to a direction in which the first leading terminal is led, and on the back surface of the substrate, mount terminals connected to the through terminals are formed, the first crystal holding terminal is connected to the one leading electrode of the crystal piece by a conductive adhesive in an end portion from which the first leading terminal is led, and the second crystal holding terminal is connected to the other leading electrode of the crystal piece by the conductive adhesive in an end portion from which the second leading terminal is led.