Abstract

An amplifier device includes a back-EMF voltage shorting circuit between a power supply terminal located on a primary side of an output transformer and a constant potential terminal grounded. The back-EMF voltage shorting circuit is provided with a capacitor and a diode in parallel. When a back-EMF voltage input into a circuit of an amplifier device is a positive potential, a back-EMF current flows from the power supply terminal toward the constant potential terminal, and the back-EMF current is short-circuited by the capacitor at this time. On the other hand, when the input back-EMF voltage is a negative potential, the back-EMF current flows from the constant potential terminal toward the power supply terminal, and is short-circuited by the diode at this time.

IPC Classes  ?

• H03F 1/30 - Modifications of amplifiers to reduce influence of variations of temperature or supply voltage
• H03F 1/26 - Modifications of amplifiers to reduce influence of noise generated by amplifying elements
• H04R 3/00 - Circuits for transducers
• H04R 9/02 - Transducers of moving-coil, moving-strip, or moving-wire type Details

Abstract

[Problem] To provide an amplifier device, an audio device, and a method for controlling an amplifier device with which it is possible to reduce generation of a back-EMF voltage and to improve sound quality. [Solution] An amplifier device 2 is provided with a back-EMF voltage shorting circuit 25 between a power supply terminal 23 on the primary side of an output transformer 22 and a constant potential terminal 24 which is grounded. In the back-EMF potential shorting circuit 25, a capacitor C and a diode D are provided in parallel. When the back-EMF voltage input into the circuit of the amplifier device 1 is a positive potential, a back-EMF current flows from the power supply terminal 23 toward the constant potential terminal 24, where the back-EMF current is in short state due to the capacitor C. On the other hand, when the input back-EMF voltage is a negative potential, a back-EMF current flows from the constant potential terminal 24 toward the power supply terminal 23, where a short state is created by the diode D.

IPC Classes  ?

• H04R 3/00 - Circuits for transducers
• H03F 1/26 - Modifications of amplifiers to reduce influence of noise generated by amplifying elements
• H03F 3/22 - Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with tubes only

Abstract

A speaker device 101 includes vibrating body components constituting a vibrating body, consisting of at least a voice coil 119, a diaphragm 106, and a frame 102, and magnetic circuit components constituting a magnetic circuit, consisting of at least a plate 103, a yoke 104, a magnet 105, and a center pole 112. By winding an insulation coated conductor wire 120 around an outer circumference of any of the magnetic circuit components and connecting one end and the other end of the insulation coated conductor wire, a current flows in the insulation coated conductor wire 120 and makes (+) potentials and (−) potentials that are mixed on the surface of the magnetic circuit component and cause an eddy current equal to each other instantaneously, so that generation of an eddy current can be suppressed.

IPC Classes  ?

• H04R 9/06 - Loudspeakers
• H04R 9/02 - Transducers of moving-coil, moving-strip, or moving-wire type Details
• H04R 1/22 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
• H04R 3/00 - Circuits for transducers
• H04R 7/12 - Non-planar diaphragms or cones
• H04R 7/18 - Mounting or tensioning of diaphragms or cones at the periphery

Abstract

[Problem] To provide a speaker device and a speaker device sound quality improvement method whereby the occurrence of eddy current during a voice coil operation can be suppressed, thereby improving the sound quality. [Solution] A speaker device 101 comprises: vibrating body components that include at least a voice coil 119, a vibrating plate 106 and a frame 102 and that constitute a vibrating body; and magnetic circuit components that include at least a plate 103, a yoke 104, a magnet 105 and a center pole 112 and that constitute a magnetic circuit. An insulation-coated conductor 120 is wound around any one of the magnetic circuit components and one end of the insulation-coated conductor 120 is connected to the other end thereof, thereby causing a current to flow through the insulation-coated conductor 120, thereby causing plus and minus potentials, coexisting on the surfaces of the magnetic circuit components and otherwise leading to the occurrence of eddy current, to become the same potentials instantaneously, whereby the occurrence of eddy current can be suppressed. Accordingly, any current distortion due to eddy current can be suppressed, the response of the voice coil 119 can be enhanced, and the sound quality of the speaker device 101 can be enhanced.

IPC Classes  ?

• H04R 9/02 - Transducers of moving-coil, moving-strip, or moving-wire type Details