초록 ▼

A piezoelectric speaker comprises a piezoelectric vibrator (1) for vibrating in a bending mode, which is supported at its longitudinal intermediate position by a support member (6), whereby first and second portions (1a, 1b) of the piezoelectric vibrator (1) on both sides of the support member (6) a

A piezoelectric speaker comprises a piezoelectric vibrator (1) for vibrating in a bending mode, which is supported at its longitudinal intermediate position by a support member (6), whereby first and second portions (1a, 1b) of the piezoelectric vibrator (1) on both sides of the support member (6) are respectively supported in a cantilever manner. The piezoelectric vibrator (1) is connected at portions close to both ends thereof with a diaphragm (8) by coupling members (12) formed by wires, whereby bending vibration of the piezoelectric vibrator (1) is transferred to the diaphragm (8) thereby to drive the diaphragm (8). The position of the support member (6) with respect to the piezoelectric vibrator (1) is so selected that the resonance frequency of the first portion (1a) is smaller than the corresponding resonance frequency of the second portion (1b), and the primary resonance frequency (f1) of the second portion (1b) is so selected as to be substantially at the center value of the first resonance frequency F1) and the second resonance frequency (F2) of the first portion (1a) on logarithmic coordinates.

대표청구항 ▼

A piezoelectric speaker comprising a piezoelectric vibrator for vibrating in a bending mode supported at a longitudinal intermediate position thereof by a support member whereby first and second portions of said piezoelectric vibrator on both sides of said support member are supported in a cantileve

A piezoelectric speaker comprising a piezoelectric vibrator for vibrating in a bending mode supported at a longitudinal intermediate position thereof by a support member whereby first and second portions of said piezoelectric vibrator on both sides of said support member are supported in a cantilever manner respectively, said piezoelectric vibrator being connected at portions close to both ends thereof with a diaphragm whereby bending vibration of said piezoelectric vibrator is transferred to said diaphragm thereby to drive said diaphragm, the position of said support member with respect to said piezoelectric vibrator being so selected that the resonance frequency of said first portion is smaller than the corresponding resonance frequency of said second portion, and the primary resonance frequency of said second portion being so selected as to be substantially at the center value of the primary and secondary frequencies of said first portion on logarithmic coordinates.