Piezoelectric vibrator, oscillator, electronic apparatus, and radio-controlled timepiece

Abstract

The present invention provides a piezoelectric vibrator capable of suppressing vibration leakage while securing mounting strength of a piezoelectric vibrating reed, and an oscillator, an electronic apparatus, and a radio-controlled timepiece each using the piezoelectric vibrator. The piezoelectric vibrator (1) includes: a package that accommodates a piezoelectric vibrating reed (4); and a bump that mounts the base portion (12) of the piezoelectric vibrating reed (4) on a package. The bump includes a plurality of main bumps (B1) which is arranged in a line in the width direction (W) of the base portion (12) so as to be bonded to the base portion (12); and an auxiliary bump (B2) which is bonded to the base portion (12) in an area between the main bumps disposed at both ends in the width direction (W) of the base portion (12) and an area between the main bumps (B1) and base ends of the vibrating arms (10, 11) in the longitudinal direction (X) of the base portion.

Description

technical field [0001] The present invention relates to piezoelectric vibrators, oscillators, electronic equipment and radio clocks. Background technique [0002] In recent years, piezoelectric vibrators using crystals or the like as a time source, a timing source of a control signal, a reference signal source, and the like have been used in mobile phones and portable information terminal devices. Various types of such piezoelectric vibrators are available, but piezoelectric vibrators in which a so-called tuning-fork type piezoelectric vibrating piece is sealed in a package are known. [0003] The tuning fork-type piezoelectric vibrating reed is a thin plate-shaped crystal plate having a pair of vibrating arms arranged in a row in the width direction and a base integrally fixing the proximal ends of the pair of vibrating arms in the longitudinal direction. A pair of excitation electrodes are formed on both the upper surface and the lower surface of each vibrating arm of the...

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Problems solved by technology

[0009] However, on the other hand, since the piezoelectric vibrating reed of Patent Document 1 is firmly mounted on the package by a plurality of bumps, when the piezoelectric vibrating reed is operated, there is a concern that the piezoelectric vibrating reed may vibrate. So-called vibration leakage that leaks to the outside via multiple bumps

If vibration leakage occurs, the vibration energy of the piezoelectric vibrating piece will leak to the outside, so there is concern that the energy efficiency of the piezoelectric vibrator will deteriorate

In addition, when a piezoelectric vibrator that causes vibration leakage is mounted on a substrate such as an electronic device, the degree of restriction of the piezoelectric vibrator may vary due to the solid unevenness of the mounting state such as the amount of solder, so there is concern about the piezoelectric vibrator. Deviations occur in the vibration characteristics of the vibrator

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