Speaker device

Abstract

Abstract PURPOSE:To prevent the compression of a dynamic range through the compressed linearity, by splitting a conductor arranged in a magnetic gap into two conductors so that the conductors can generate a driving force in adverse direction with each other. CONSTITUTION:A conductor arranged in a magnetic gap of a magnetic circuit is split into two conductors 1 and 1'. With the conductor of a voice coil, the conductors 1 and 1' are separately wound on a coil bobbin. On the other hand, transistors 2 and 2' are biased and constant DC currents IDC and I'DC flows to the conductors 1 and 1' without no signal application to the bases. When an audio signal or a signal with inverted phase is applied to the base, the currents IDC and I'DC are modulated with the signal, resulting that a correct superimposing the audio current with inversed phase on the currents IDC and I'DC respectively is applied to the conductors 1 and 1'. Thus, the total current is constant as 2IDC and the heat generation for the whole device is made constant, preventing change of resistance value.

Inventors

• 👤 Takashi Ooyaba
• 👤 隆史 大矢場

Bibliographic Details