| 摘要 |
A quartz crystal unit which has a small size and light weight and can oscillate at overtone frequencies. The aspect ratio (w/t) of the quartz plate at which no coupling with spurious vibrations occurs within the operating temperature range even when the width and length of the quartz plate are below 1.5 mm and below 4.7 mm, respectively, is specified. It has been experimentally confirmed that an AT-cut rectangular quartz plate having an aspect ratio of 8.48 +/- 0.05, 12.18 +/- 0.05, 13.22 +/- 0.07, 14.78 +/- 0.07, or 15.57 +/- 0.07 has excellent temperature characteristics. In addition, several factors which are essential to providing a quartz plate having a low equivalent series resistance have been found.
|
