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Abstract

Vibration is prevented from being transmitted via a fixed substrate. In order to set the resonance frequencies of the vibration of piezoelectric vibrators to be different from each other, the piezoelectric vibrators having different lengths are attached to the same fixed substrate. Even if residual vibration of a pressure generation chamber, which is expanded/contracted by a piezoelectric vibrator to which a voltage is applied, is transmitted to the fixed substrate; and even if the vibration is transmitted to another piezoelectric vibrator via the fixed substrate; another piezoelectric vibrator does not vibrate because the resonance frequencies between the piezoelectric vibrators are different from each other. Consequently, the pressure generation chamber in contact with the piezoelectric vibrator is not expanded or contracted by the vibration.

Dependencies are inferred from the claim text.