Face shear mode quartz crystal resonator

• US 4,900,971 A
• Filed: 03/07/1989
• Issued: 02/13/1990
• Est. Priority Date: 03/10/1988
• Status: Expired due to Term

• Current Assignee: Seiko Electric Company Limited
• Original Assignee: Seiko Electric Company Limited
• Inventors: Kawashima, Hirofumi
• Primary Examiner(s): BUDD, MARK OSBORNE
• Application Number:
  US07/320,157
• Time in Patent Office: 343 Days
• Field of Search: 310/361, 310/367, 310/368, 310/348, 310/346
• US Class Current: 310/361
• CPC Class Codes: H03H 9/02157 Dimensional parameters, e.g. ratio between two dimension parameters, length, width or thickness
• CPC Class Codes: H03H 9/19 consisting of quartz

Abstract

A face shear mode quartz crystal resonator having a vibrational portion and supporting portions incorporated therein by an etching method. A flexural portion of the supporting portion is connected with a central portion of a side of the vibrational portion. The width W and length L of the flexural portion connected with the vibrational portion are designed so as to meet "W≦0.67L". The supporting portions are provided at the edges in the z'"'"'-axis direction of the vibrational portion which is substantially square and fixedly supported via both distal end portions of the supporting portions, and each side of the vibrational portion is from 0.72 mm to 2.02 mm.

Claims

1. A face shear mode quartz crystal resonator having a vibrational portion and supporting portions incorporated therein by and etching method, characterized in that a flexural portion of said supporting portion is connected with a central portion of a side of said vibrational portion, the width W of said flexural portion connected with said vibrational portion is smaller than 0.67 L (L is the length of said flexural portion), said supporting portions are provided at the edges in the z'"'"'-axis direction of said vibrational portion, said vibrational portion is substantially square, each side of said vibrational portion is from 0.72 mm to 2.02 mm, and said vibrational portion is fixedly supported via both distal end portions of said supporting portions.