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US 4,234,812 AGranted
Thickness-width shear quartz crystal vibrator
AssigneeKabushiki Kaisha Daini Seikosha
InventorHirofumi Kawashima
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AssigneeKabushiki Kaisha Daini Seikosha
InventorHirofumi Kawashima
Estimating the term…
A thickness-width shear quartz crystal vibrator, having each vibrating mode (p, q, r) respectively being (1, 1, 1), in which "p" is the number of crests of a sine wave form of polarization directed along its electrical axis, "q" is the number of crests of a cosine waveform of polarization directed along its thickness and "r" is the number of crests of cosine waveform of polarization directed along its width perpendicular to the said electrical axis. The vibrator is cut out from a Y-plate of quartz crystal at the angle between 34 to 36 degrees turned around the X-axis thereof and is provided with plural opposite electrodes on the vertical surface or the surface parallel to the y-axis thereof. Therefore, the said quartz crystal vibrator has a low equivalent impedance and also has an excellent frequency-temperature characteristic.
A thickness-width shear quartz crystal vibrator cut out from the a Y-plate of quartz crystal at the angle of 34 to 36 degrees truned around the X'-axis thereof, wherein respective pairs of spaced electrodes are respectively provided on the main surfaces thereof which are penpendicular to the Y'-axis thereof, said spaced electrodes provided on each main surface having a different polarity and spaced in the width dimensions of the vibrator, and frequency-adjusting elements adhered to the side surfaces on which said electrodes not being provided;
A thickness-width shear quartz crystal vibrator comprising:
Dependencies are inferred from the claim text.