DRIVE CIRCUIT OF PIEZOELECTRIC DIAPHRAGM FOR HEADPHONE, AND DRIVE UNIT OF HEADPHONE INCLUDING THE DRIVE CIRCUIT

To emphasize bass in a headphone including a bent piezoelectric diaphragm.SOLUTION: A drive circuit (300) is used in a headphone and vibrates a piezoelectric diaphragm (220) bent to be projected in a separating direction from an ear of a user, to thereby generate sound. The drive circuit (300) inclu...

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Bibliographic Details
Main Authors KANAI DAISUKE, KANAI FUMIHIKO, MIYAHARA NOBUHIRO, MORIYAMA NOBUHIRO, KOBAYASHI MASARU
Format Patent
LanguageEnglish
Japanese
Published 13.03.2024
Subjects
DEAF-AID SETS
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS
PUBLIC ADDRESS SYSTEMS
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Summary:To emphasize bass in a headphone including a bent piezoelectric diaphragm.SOLUTION: A drive circuit (300) is used in a headphone and vibrates a piezoelectric diaphragm (220) bent to be projected in a separating direction from an ear of a user, to thereby generate sound. The drive circuit (300) includes: a DC/DC converter (400) boosting voltage of a low-voltage power source (301); and an amplifier circuit (500) driving the piezoelectric diaphragm (220) with the use of the voltage boosted by the DC/DC converter (400). The amplifier circuit (500) includes analog filters (501, 502) performing low-pass processing with respect to a drive signal driving the piezoelectric diaphragm (220).SELECTED DRAWING: Figure 4 【課題】 湾曲させた圧電振動板を備えたヘッドフォンにおいて、低音を強調させる。【解決手段】 駆動回路（３００）は、ヘッドフォンで用いられ、使用者の耳から離れる方向に凸となるように湾曲した圧電振動板（２２０）を振動させて音を発生させる。駆動回路（３００）は、低電圧電源（３０１）の電圧を昇圧するＤＣ／ＤＣコンバータ（４００）と、ＤＣ／ＤＣコンバータ（４００）による昇圧後の電圧を用いて圧電振動板（２２０）を駆動するアンプ回路（５００）とを有する。アンプ回路（５００）は、圧電振動板（２２０）を駆動する駆動信号に対してローパス処理を行うアナログフィルタ（５０１，５０２）を有する。【選択図】図４
Bibliography:Application Number: JP20220137198