Method of adjusting resonant frequency of a coupling resonator

Claim 1

A method of adjusting the resonant frequency of a resonator having a plurality of coupled vibrational modes which comprises the steps of: measuring the resonant frequency of the fundamental vibration at a plurality of different temperatures; calculating a frequency-temperature coefficient of the first order α by use of said different temperatures and respective resonant frequencies of the fundamental vibration; adding weights to or removing weights from the vibrational portion of the resonator at a first predetermined portion thereof so as to adjust the first order temperature coefficient α to almost zero; and thereafter adding weights to or removing weights from the vibrational portion at a second predetermined portion thereof so as to adjust the resonant frequency of the fundamental vibration in such manner that the frequency-temperature coefficient of the first order α hardly shifts.

Claim 2

A method of adjusting the resonant frequency of a resonator having a plurality of coupled vibrational modes which comprises the steps of: measuring the resonant frequency of the fundamental vibration at a plurality of different temperatures; calculating a frequency-temperature coefficient of the first order α by use of said different temperatures and respective resonant frequencies of the fundamental vibration; adding weights to or removing weights from the vibrational portion of the resonator at a first predetermined portion thereof so as to adjust the first order temperature coefficient α to almost zero; and thereafter adding weights to or removing weights from the vibrational portion at a second predetermined portion thereof so as to adjust the resonant frequency of the fundamental vibration in such manner that the frequency-temperature coefficient of the first order α hardly shifts.

Claim 7

A method of adjusting the resonant frequency of a resonator having a plurality of vibrational modes which comprises the steps of: setting the resonator at an arbitrary temperature t 1 ; measuring the resonant frequency f 1 of a fundamental vibration of the resonator at the arbitrary temperature t 1 ; thereafter setting the resonator at another temperature t 2 ; measuring the resonant frequency f 2 of said fundamental vibration at the temperature t 2 ; calculating a frequency-temperature coefficient of the first order α by use of the temperatures t 1 , t 2 and the respective resonant frequencies f 1 , f 2 ; adding weights to or removing weights from the vibrational portion of the resonator at locations effective to adjust the first order temperature coefficient α to almost zero; and thereafter adding weights to or removing weights from the vibrational portion of the resonator at predetermined portions thereof effective to adjust the resonant frequency of the fundamental vibration in such manner that the frequency-temperature coefficient of the first order α hardly shifts.

Claim 8

A method of adjusting the resonant frequency of a resonator having a plurality of vibrational modes which comprises the steps of: setting the resonator at an arbitrary temperature t 1 ; measuring the resonant frequency f 1 of a fundamental vibration of the resonator at the arbitrary temperature t 1 ; thereafter setting the resonator at another temperature t 2 ; measuring the resonant frequency f 2 of said fundamental vibration at the temperature t 2 ; calculating a frequency-temperature coefficient of the first order α by use of the temperatures t 1 , t 2 and the respective resonant frequencies f 1 , f 2 ; adding weights to or removing weights from the vibrational portion of the resonator at locations effective to adjust the first order temperature coefficient α to almost zero; and thereafter adding weights to or removing weights from the vibrational portion of the resonator at predetermined portions thereof effective to adjust the resonant frequency of the fundamental vibration in such manner that the frequency-temperature coefficient of the first order α hardly shifts.

Claim 9

A method for adjusting the resonant frequency of a coupling resonator comprising the steps of: providing a coupling resonator having a resonant portion vibratable in at least two coupled together modes of vibration including a fundamental mode and a sub mode; adjusting the first order frequency-temperature coefficient of the resonator to near zero by the addition of reduction of weights on the resonant portion; and thereafter adjusting the resonant frequency of the fundamental mode of vibration by the addition or reduction of weights on the resonant portion without significantly disturbing the previously adjusted first order frequency-temperature coefficient.

Claim 10

A method for adjusting the resonant frequency of a coupling resonator comprising the steps of: providing a coupling resonator having a resonant portion vibratable in at least two coupled together modes of vibration including a fundamental mode and a sub mode; adjusting the first order frequency-temperature coefficient of the resonator to near zero by the addition of reduction of weights on the resonant portion; and thereafter adjusting the resonant frequency of the fundamental mode of vibration by the addition or reduction of weights on the resonant portion without significantly disturbing the previously adjusted first order frequency-temperature coefficient.