Patent ID: 11942897
Assignee: NATIONAL YANG MING CHIAO TUNG UNIVERSITY
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A crystal oscillator, comprising:
an oscillating substrate including a first surface, a second surface opposite to said first surface, a side surface interconnecting said first surface and said second surface, and an oscillating portion, said oscillating portion having a main oscillating region and a thinned region that has a thickness smaller than that of said main oscillating region;
a hollow frame disposed on said second surface of said oscillating substrate, and exposing said oscillating portion;
a first electrode including a first electrode portion formed on said first surface of said oscillating substrate, and a first extending electrode portion extending from said first electrode portion on said first surface along said side surface to said second surface; and
a second electrode disposed on said second surface of said oscillating substrate, and including a second electrode portion, and a second extending electrode portion extending from said second electrode portion toward said first extending electrode portion on said second surface, a projection of said second electrode portion on said second surface of said oscillating substrate partially overlapping a projection of said first electrode portion on said second surface of said oscillating substrate, said second electrode portion having at least one opening in positional correspondence with said thinned region.