Unit, oscillator and electronic apparatus
AssigneePiedek Technical Laboratory
InventorHirofumi Kawashima
Life of this patent
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Abstract
In a quartz crystal unit, the unit comprising a quartz crystal resonator having an overall length less than 2.1 mm, and a base portion, and first and second vibrational arms, at least one groove being formed in at least one of opposite main surfaces of each of the first and second vibrational arms so that a width of the at least one groove is greater than or equal to a distance in the width direction of the at least one groove measured from an outer edge of the at least one groove to an outer edge of the corresponding one of the first and second vibrational arms and less than 0.07 mm, at least one metal film for adjusting an oscillation frequency of the quartz crystal resonator being disposed on at least one of the opposite main surfaces of each of the first and second vibrational arms.
Claims26
A quartz crystal unit comprising:
- a quartz crystal resonator having an overall length less than 2.1 mm and an oscillation frequency, and a base portion, and first and second vibrational arms connected to the base portion, each of the first and second vibrational arms having opposite main surfaces;
- wherein at least one groove is formed in at least one of the opposite main surfaces of each of the first and second vibrational arms so that a width of the at least one groove formed in the at least one of the opposite main surfaces of each of the first and second vibrational arms is greater than or equal to a distance in the width direction of the at least one groove measured from an outer edge of the at least one groove to an outer edge of the corresponding one of the first and second vibrational arms and less than 0.07 mm;
- and
- wherein at least one metal film for adjusting the oscillation frequency of the quartz crystal resonator is disposed on at least one of the opposite main surfaces of each of the first and second vibrational arms.
A quartz crystal oscillator comprising:
- a quartz crystal oscillating circuit comprised of a quartz crystal resonator having an overall length less than 2.1 mm and an oscillation frequency, and a base portion, and first and second vibrational arms connected to the base portion, each of the first and second vibrational arms having opposite main surfaces;
- wherein at least one groove is formed in at least one of the opposite main surfaces of each of the first and second vibrational arms so that a width of the at least one groove formed in the at least one of the opposite main surfaces of each of the first and second vibrational arms is greater than or equal to a distance in the width direction of the at least one groove measured from an outer edge of the at least one groove to an outer edge of the corresponding one of the first and second vibrational arms and less than 0.07 mm;
- and
- wherein at least one metal film for adjusting the oscillation frequency of the quartz crystal resonator is disposed on at least one of the opposite main surfaces of each of the first and second vibrational arms.
An electronic apparatus comprising:
- a display portion;
- and at least one oscillating circuit comprised of a quartz crystal resonator having an overall length less than 2.1 mm and an oscillation frequency, and a base portion, and first and second vibrational arms connected to the base portion, each of the first and second vibrational arms having opposite main surfaces;
- wherein at least one groove is formed in at least one of the opposite main surfaces of each of the first and second vibrational arms so that a width of the at least one groove formed in the at least one of the opposite main surfaces of each of the first and second vibrational arms is greater than or equal to a distance in the width direction of the at least one groove measured from an outer edge of the at least one groove to an outer edge of the corresponding one of the first and second vibrational arms and less than 0.07 mm;
- wherein at least one metal film for adjusting the oscillation frequency of the quartz crystal resonator is disposed on at least one of the opposite main surfaces of each of the first and second vibrational arms;
- and
- wherein an output signal of the at least one oscillating circuit having the quartz crystal tuning fork resonator is a clock signal for use in operation of the electronic apparatus to display time information at the display portion.
Dependencies are inferred from the claim text.