Title:
静電型トランスデューサ、容量性負荷の駆動回路、回路定数の設定方法、超音波スピーカ、および指向性音響システム
Document Type and Number:
Japanese Patent JP4983171
Kind Code:
B2
Abstract:
Provided is an electrostatic transducer which is driven by a boosted driving signal by boosting a modulated signal obtained by modulating a carrier wave with an acoustic signal in an audio frequency band, the transducer including: an output transformer T which connects the electrostatic transducer to a secondary side winding thereof in parallel and boosts the modulated signal; and a resistor R and a coupling capacitance C1 connected in series to a primary side winding of the output transformer T, wherein a circuit constant of a primary side circuit of the output transformer T including a serial circuit of the resistor R and the coupling capacitance C1 and a circuit constant of a secondary side circuit of the output transformer including a self-inductance L2 and a load capacitance CL of the secondary side winding of the output transformer T are set such that a resonance frequency f0 of a circuit formed by the self-inductance L2 of the secondary side winding of the output transformer T and the load capacitance CL(F) of the electrostatic transducer is matched or approximately matched to a carrier wave frequency fc of the electrostatic transducer.
Inventors:
宮▲崎▼ 新一
Application Number:
JP2006246779A
Publication Date:
July 25, 2012
Filing Date:
September 12, 2006
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
H04R3/00; G03B31/00; H04R1/40; H04R19/02
Domestic Patent References:
| JP2004501524A | ||||
| JP2003047085A | ||||
| JP2003513576A |
Attorney, Agent or Firm:
Masatake Shiga
Masakazu Aoyama
Masakazu Aoyama