Title:
Tuning fork type crystal oscillator
Document Type and Number:
Japanese Patent JP6087527
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a tuning-fork type crystal vibrator in which reduction in electric field efficiency accompanying miniaturization or thinning is prevented and which is capable of having a peak temperature in the vicinity of a desired temperature.SOLUTION: A tuning-fork type crystal vibrator 11 comprises: a pair of vibrating arms 13, 14 extending from a base; grooves 15, 16 recessed in a length direction of the vibrating arms 13, 14; walls 17, 18 forming the grooves 15, 16; and exciting electrodes 19, 20 provided on surfaces of the walls 17, 18. When a linear function is used for approximating a first-order term temperature coefficient of a Young's modulus of the exciting electrodes 19, 20, a first-order term coefficient is denoted by A, a zero-order term coefficient is denoted by B, a room temperature is denoted by T and a Taylor expansion temperature is denoted by T, the temperature characteristics of the exciting electrodes 19, 20 are represented by E(T)=A(T-T)+B. When the minimum thickness of the walls 17, 18 is 6 μm or less and under the condition of A>-20 MPa/°C, a thickness of the exciting electrodes 19, 20 opposed to at least one of the walls 17, 18 is 1/50 or less as thick as the minimum thickness of the walls 17, 18.
Inventors:
Endo Hayato
Miyagawa Masaki
Miyagawa Masaki
Application Number:
JP2012157255A
Publication Date:
March 01, 2017
Filing Date:
July 13, 2012
Export Citation:
Assignee:
River Eletech Co., Ltd.
International Classes:
H03H9/19; H03H9/02; H03H9/215
Domestic Patent References:
| JP2008048275A | ||||
| JP2008042873A | ||||
| JP2011223489A | ||||
| JP49090088A | ||||
| JP2010220193A | ||||
| JP2000307164A |
Foreign References:
| WO2011077766A1 |
Attorney, Agent or Firm:
Satoshi Asakawa