Electronic apparatus with two quartz crystal oscillators...

Details Electronic apparatus with two quartz crystal oscillators... Electronic apparatus with two quartz crystal oscillators...

2005-05-24

2005-05-24

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Coupling networks

Electromechanical filter

C333S200000, C331S1070DP, C331S156000, C310S370000

Reexamination Certificate

active

06897743

ABSTRACT:
An electronic apparatus has a display portion and quartz crystal oscillators having different modes of vibration. Each of the quartz crystal oscillators has a quartz crystal oscillating circuit having a quartz crystal resonator. The quartz crystal resonator of one of the quartz crystal oscillating circuits is a width-extensional mode quartz crystal resonator capable of vibrating in a width-extensional mode. The width-extensional mode quartz crystal resonator has a vibrational portion, connecting portions disposed at ends of the vibrational portion, supporting portions connected to the vibrational portion through the connecting portions, and electrodes disposed on upper and lower surfaces of the vibrational portion. The quartz crystal oscillating circuit having the width-extensional mode quartz crystal resonator outputs a clock signal for operating the electronic apparatus to display time information at the display portion.

REFERENCES:
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patent: 4384232 (1983-05-01), Debely
patent: 4469979 (1984-09-01), Chuang
patent: 5166645 (1992-11-01), Watts
patent: 5285127 (1994-02-01), Egley et al.
patent: 6208266 (2001-03-01), Lyons et al.
patent: 6541897 (2003-04-01), Endoh
patent: 6587009 (2003-07-01), Kitamura et al.

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