| 摘要 |
<p>PURPOSE:To make compact the constitution of the device for making alarming by a speaker according to the output of an electrostatic sensor. CONSTITUTION:This speaker device consists of three-layered electrodes; a sensor electrode 1a, ground electrode 1b and reference electrode 1c and a grounded shield 1d which covers three layers of these electrodes and has an aperture on the sensor electrode 1a side. The electrostatic sensor 1 which compares a change in the electrostatic capacity appearing in a capacitor C1 formed of the sensor electrode 1a and the ground electrode 1b when a dielectric substance, such as man, approaches the sensor electrode 1a side with the electrostatic capacity of a capacitor 2 formed of the reference electrode 1c and the ground electrode 1b and emits output by sensing the approach of the dielectric substance is mounted on the center of the front surface of the speaker 3 by a supporting member 2, by which the constitution is made compact.</p> |
