| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a piezoelectric device designed to prevent deterioration in vibration characteristics such as a frequency shift caused by an application of an excessive impact force onto a crystal vibration chip in the vertical direction due to falling or the like. <P>SOLUTION: A crystal vibrator 10 as a piezoelectric device comprises: a crystal vibration chip 14 as a piezoelectric vibration chip having a base part 16, vibration arms 15 extending in parallel from the base part 16, support arms 17 extending from the base part 16 and formed in parallel with corresponding side faces of the vibration arms 15 in such a manner to sandwich the vibration arms 15, weight layers 21 formed on main surfaces in the vicinity of respective open ends 27 of the plurality of vibration arms 15, and frequency adjustment parts 22 where the weight layers 21 are melted with a gap formed with the open ends 27; and a package 11 in which the crystal vibration chip 14 is housed in a housing part 13 and air-tightly sealed by a lid body 24. In the crystal vibration chip 14, a part of the support arms 17 is connected with the housing part 13 by connection parts 25, and the crystal vibration chip forms narrow gaps with a bottom 12 of the housing part 13 and with the lid part 24. <P>COPYRIGHT: (C)2012,JPO&INPIT |
