NONFLAMMABLES SPEAKER OF PIEZO ELECTRICITY TYPE

摘要

The present invention relates to a nonflammable piezoelectric speaker apparatus which can make loud sound while not being influenced by the outside such as a temperature, moisture, etc. in the event of fire by transmitting an electric signal of a sound which is outputted from a sound apparatus and is amplified via an amplifier, through an electric wire while attaching the ceramic plate in the center of a metallic diaphragm vibration plate. While a sharp conical end of a support piece where one side is fixed in a sound box where the metallic diaphragm vibration plate is fixed is not coupled while receiving elasticity of a spring, the speaker apparatus of the present invention makes a stable loud sound from a high-pitched tone to a low-pitched tone by controlling a vibration of the ceramic plate. By forming a bent part on the circumference of the metallic diaphragm vibration plate where the ceramic plate is attached in the center, the speaker apparatus can attenuate a distortion frequency of a middle-pitched tone band and a high-pitched tone band.