Patent ID: 8576020
Filing Date: 2013-11-05
Classification: H01L

Abstract:
1. A crystal oscillator comprising: a container body including first and second main surfaces; a crystal blank accommodated in a first recess formed in the first main surface; a metal cover that closes the first recess to hermetically encapsulate said crystal blank in the first recess; and an IC chip that integrates an electronic circuit including at least an oscillator circuit using said crystal blank and is accommodated in a second recess formed in the second main surface, wherein the electronic circuit is formed on a circuit formation plane that is one main surface of said IC chip, said IC chip is fixed to a bottom surface of the second recess by flip-chip bonding such that the circuit formation plane is opposed to the bottom surface of the second recess, a radiation protective film is formed on the other main surface of said IC chip, and the radiation protective film is a film having a density higher than that of a material of a semiconductor substrate configuring said IC chip.