JP6949402B2 - Ultrasonic speaker - Google Patents

Ultrasonic speaker Download PDF

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JP6949402B2
JP6949402B2 JP2020553066A JP2020553066A JP6949402B2 JP 6949402 B2 JP6949402 B2 JP 6949402B2 JP 2020553066 A JP2020553066 A JP 2020553066A JP 2020553066 A JP2020553066 A JP 2020553066A JP 6949402 B2 JP6949402 B2 JP 6949402B2
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ultrasonic
ultrasonic vibrator
speaker
vibrator
ultrasonic speaker
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JPWO2020085047A1 (en
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陽一 落合
陽一 落合
貴之 星
貴之 星
信之 伊東
信之 伊東
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Pixie Dust Technologies Inc
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/26—Sound-focusing or directing, e.g. scanning
    • G10K11/28—Sound-focusing or directing, e.g. scanning using reflection, e.g. parabolic reflectors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Description

本発明は、超音波スピーカに関する。 The present invention relates to an ultrasonic speaker.

特定の方向について指向性を有する超音波を放射することにより、可聴音の音源を空間上に形成する超音波スピーカが知られている。 There is known an ultrasonic speaker that forms an audible sound source in space by emitting ultrasonic waves having directivity in a specific direction.

例えば、特開２０１２−２３９０２３号公報は、膜部材を用いて低音を復調する超音波スピーカを開示している。 For example, Japanese Patent Application Laid-Open No. 2012-239023 discloses an ultrasonic speaker that demodulates bass by using a membrane member.

しかし、超音波は、一般的な音波に比べて音圧が低いという特性がある。そのため、超音波スピーカによって再現される可聴音は、一般的な音波を利用するスピーカ（例えば、ラウドスピーカ）によって再現される可聴音に比べて、音量が低くなる傾向にある。 However, ultrasonic waves have a characteristic that the sound pressure is lower than that of general sound waves. Therefore, the audible sound reproduced by the ultrasonic speaker tends to be lower in volume than the audible sound reproduced by a speaker using a general sound wave (for example, a loudspeaker).

特開２０１２−２３９０２３号公報の超音波スピーカは低音を補填するものであって、可聴音の音量を補填するものではない。そのため、音量を向上させることは難しい。 The ultrasonic speaker of JP2012-23902A is intended to compensate for bass, not to compensate for the volume of audible sound. Therefore, it is difficult to improve the volume.

本発明の目的は、超音波スピーカによって再現される可聴音の音量を補填することである。 An object of the present invention is to compensate for the volume of audible sound reproduced by an ultrasonic speaker.

本発明の一態様は、
複数の超音波振動子を備え、
前記超音波振動子の超音波の放射方向に直交する方向について、各超音波振動子から離間した位置に配置された反射部材を備え、
前記反射部材は、各超音波振動子から放射された超音波を反射するように構成される、
超音波スピーカである。One aspect of the present invention is
Equipped with multiple ultrasonic transducers
A reflecting member arranged at a position separated from each ultrasonic vibrator in a direction orthogonal to the ultrasonic radiation direction of the ultrasonic vibrator is provided.
The reflecting member is configured to reflect ultrasonic waves radiated from each ultrasonic vibrator.
It is an ultrasonic speaker.

本発明によれば、超音波スピーカによって再現される可聴音の音量を補填することができる。 According to the present invention, the volume of audible sound reproduced by the ultrasonic speaker can be compensated.

超音波スピーカの外観を示す図である。It is a figure which shows the appearance of an ultrasonic speaker. 図１の超音波スピーカの構成を示す概略図である。It is the schematic which shows the structure of the ultrasonic speaker of FIG. 図１の超音波スピーカの動作例の説明図である。It is explanatory drawing of the operation example of the ultrasonic speaker of FIG. 図１の超音波スピーカの動作原理の説明図である。It is explanatory drawing of the operation principle of the ultrasonic speaker of FIG. 変形例１の超音波スピーカの動作原理の説明図である。It is explanatory drawing of the operation principle of the ultrasonic speaker of the modification 1. FIG. 変形例２の超音波スピーカの動作原理の説明図である。It is explanatory drawing of the operation principle of the ultrasonic speaker of the modification 2.

以下、本発明の一実施形態について、図面に基づいて詳細に説明する。なお、実施形態を説明するための図面において、同一の構成要素には原則として同一の符号を付し、その繰り返しの説明は省略する。 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In addition, in the drawing for demonstrating the embodiment, the same components are in principle the same reference numerals, and the repeated description thereof will be omitted.

（１）超音波スピーカの構成
超音波スピーカの構成について説明する。図１は、超音波スピーカの外観を示す図である。図２は、図１の超音波スピーカの構成を示す概略図である。(1) Configuration of Ultrasonic Speaker The configuration of the ultrasonic speaker will be described. FIG. 1 is a diagram showing the appearance of an ultrasonic speaker. FIG. 2 is a schematic view showing the configuration of the ultrasonic speaker of FIG.

図１に示すように、超音波スピーカ１０は、ＸＹ平面上に形成された超音波振動子モジュール１１を有する。超音波振動子モジュール１１は、放射方向（Ｚ方向）に超音波ＵＷを放射するように構成される。 As shown in FIG. 1, the ultrasonic speaker 10 has an ultrasonic vibrator module 11 formed on an XY plane. The ultrasonic vibrator module 11 is configured to radiate ultrasonic waves UW in the radiation direction (Z direction).

図２Ａに示すように、超音波振動子モジュール１１は、複数の超音波振動子１１ａと、反射部材１１ｂと、を備える。 As shown in FIG. 2A, the ultrasonic vibrator module 11 includes a plurality of ultrasonic vibrators 11a and a reflection member 11b.

各超音波振動子１１ａは、振動することにより、超音波を発生させるように構成される。
複数の超音波振動子１１ａは、例えば、格子状に配列される。Each ultrasonic vibrator 11a is configured to generate ultrasonic waves by vibrating.
The plurality of ultrasonic vibrators 11a are arranged in a grid pattern, for example.

反射部材１１ｂは、放射方向（Ｚ方向）に直交する方向（Ｘ方向及びＹ方向）について、各超音波振動子１１ａから離間した位置に配置される。放射方向（Ｚ方向）について、反射部材１１ｂの上端１１ｂｔは、超音波振動子１１ａの上端ａｔより高い位置に位置し、且つ、反射部材１１ｂの下端１１ｂｂは、超音波振動子１１ａの下端１１ａｂと同じ位置に位置する（つまり、反射部材１１ｂは、接地されている）。
反射部材１１ｂは、各超音波振動子１１ａから放射された超音波を反射するように構成される。The reflecting member 11b is arranged at a position separated from each ultrasonic vibrator 11a in the directions (X direction and Y direction) orthogonal to the radiation direction (Z direction). In the radiation direction (Z direction), the upper end 11bt of the reflecting member 11b is located higher than the upper end at of the ultrasonic vibrator 11a, and the lower end 11bb of the reflecting member 11b is the lower end 11ab of the ultrasonic vibrator 11a. It is located at the same position (that is, the reflective member 11b is grounded).
The reflecting member 11b is configured to reflect the ultrasonic waves radiated from each ultrasonic vibrator 11a.

図２Ｂは、図２Ａの鎖線ＡＡの部分断面を示している。
図２Ｂに示すように、Ｚ方向について、反射部材１１ｂの上面１１ｂａは、超音波振動子１１ａの上面１１ａａより高い位置にある。
超音波振動子１１ａの上方（Ｚ方向）は、開口している。したがって、超音波振動子モジュール１１の上方（Ｚ方向）から見ると、超音波振動子１１ａの上面１１ａａは露出している（図２Ａ）。FIG. 2B shows a partial cross section of the chain line AA of FIG. 2A.
As shown in FIG. 2B, the upper surface 11ba of the reflective member 11b is located higher than the upper surface 11aa of the ultrasonic vibrator 11a in the Z direction.
The upper part (Z direction) of the ultrasonic vibrator 11a is open. Therefore, when viewed from above (Z direction) of the ultrasonic vibrator module 11, the upper surface 11aa of the ultrasonic vibrator 11a is exposed (FIG. 2A).

（２）超音波スピーカの動作例
本実施形態の超音波スピーカ１０の動作例について説明する。図３は、図１の超音波スピーカの動作例の説明図である。(2) Operation example of the ultrasonic speaker An operation example of the ultrasonic speaker 10 of the present embodiment will be described. FIG. 3 is an explanatory diagram of an operation example of the ultrasonic speaker of FIG.

（２−１）超音波スピーカの動作例１
図３Ａを参照して、超音波スピーカ１０の動作例１について説明する。動作例１は、放射方向（Ｚ方向）について超音波スピーカ１０から離間した空間上の焦点に超音波を集束させる例である。(2-1) Operation example of ultrasonic speaker 1
An operation example 1 of the ultrasonic speaker 10 will be described with reference to FIG. 3A. The operation example 1 is an example in which the ultrasonic waves are focused on a focal point in space separated from the ultrasonic speaker 10 in the radiation direction (Z direction).

超音波スピーカ１０の駆動回路（不図示）は、複数の超音波振動子１１ａをそれぞれ異なるタイミングで駆動させる。その結果、各超音波振動子１１ａから放射される超音波ＵＷには位相差が生じる。
図３Ａに示すように、位相差のある超音波ＵＷは、超音波スピーカ１０に対して放射方向（Ｚ方向）に位置する空間上の焦点ＦＰに集束する。
その結果、焦点ＦＰに、可聴音の音源ＳＳが形成される。The drive circuit (not shown) of the ultrasonic speaker 10 drives a plurality of ultrasonic vibrators 11a at different timings. As a result, a phase difference occurs in the ultrasonic waves UW radiated from each ultrasonic vibrator 11a.
As shown in FIG. 3A, the ultrasonic UW having a phase difference is focused on the focal point FP in the space located in the radial direction (Z direction) with respect to the ultrasonic speaker 10.
As a result, an audible sound source SS is formed in the focal point FP.

（２−２）超音波スピーカの動作例２
図３Ｂを参照して、超音波スピーカ１０の動作例２について説明する。動作例２は、放射方向（Ｚ方向）について超音波スピーカ１０から超音波ビームを直進させる例である。(2-2) Operation example of ultrasonic speaker 2
An operation example 2 of the ultrasonic speaker 10 will be described with reference to FIG. 3B. The operation example 2 is an example in which the ultrasonic beam travels straight from the ultrasonic speaker 10 in the radiation direction (Z direction).

超音波スピーカ１０の駆動回路（不図示）は、複数の超音波振動子１１ａを同時に駆動させる。その結果、各超音波振動子１１ａから放射される超音波ＵＷには位相差が生じない。
図３Ｂに示すように、位相差のない超音波ＵＷは、超音波スピーカ１０に対して放射方向（Ｚ方向）に向かって直進する超音波ビームを形成する。
その結果、超音波ビームに沿って、可聴音の音源ＳＳが形成される。The drive circuit (not shown) of the ultrasonic speaker 10 drives a plurality of ultrasonic vibrators 11a at the same time. As a result, no phase difference occurs in the ultrasonic waves UW radiated from each ultrasonic vibrator 11a.
As shown in FIG. 3B, the ultrasonic UW having no phase difference forms an ultrasonic beam that travels straight in the radiation direction (Z direction) with respect to the ultrasonic speaker 10.
As a result, an audible sound source SS is formed along the ultrasonic beam.

（３）超音波スピーカの動作原理
本実施形態の超音波スピーカ１０の動作原理について説明する。図４は、図１の超音波スピーカの動作原理の説明図である。(3) Operating Principle of Ultrasonic Speaker The operating principle of the ultrasonic speaker 10 of the present embodiment will be described. FIG. 4 is an explanatory diagram of the operating principle of the ultrasonic speaker of FIG.

（３−１）本実施形態の動作原理
本実施形態の動作原理について説明する。(3-1) Operating Principle of the Present Embodiment The operating principle of the present embodiment will be described.

図４Ａは、超音波スピーカ１０の動作原理を示している。
図４Ａに示すように、各超音波振動子１１ａから放射された超音波ＵＷのうちＸ方向及びＹ方向の成分は、反射部材１１ｂで反射する。反射部材１１ｂで反射した成分（以下「反射成分」という）は、各超音波振動子１１ａから放射された超音波ＵＷのうちＺ方向に直進する成分（以下「直進成分」という）に向かって進行する。その結果、各超音波振動子１１ａを基準として放射方向（Ｚ方向）の空間上に点ＥＰにおいて直進成分と反射成分とが強め合う。FIG. 4A shows the operating principle of the ultrasonic speaker 10.
As shown in FIG. 4A, the components of the ultrasonic waves UW radiated from the ultrasonic transducers 11a in the X and Y directions are reflected by the reflecting member 11b. The component reflected by the reflecting member 11b (hereinafter referred to as “reflection component”) travels toward the component of the ultrasonic UW radiated from each ultrasonic vibrator 11a that travels straight in the Z direction (hereinafter referred to as “straight component”). do. As a result, the straight-ahead component and the reflection component strengthen each other at the point EP in the space in the radiation direction (Z direction) with reference to each ultrasonic vibrator 11a.

このように、本実施形態によれば、各超音波振動子１１ａから放射された超音波のうち直進成分以外の成分が反射部材１１ｂで反射することにより発生する反射成分と直進成分とが強め合う。したがって、超音波スピーカ１０から放射される超音波の音圧が増加する。その結果、超音波スピーカ１０によって空間上に形成される音源ＳＳから聴こえる可聴音の音量を増加させることができる。 As described above, according to the present embodiment, the reflection component and the straight-ahead component generated by the components other than the straight-ahead component of the ultrasonic waves radiated from each ultrasonic vibrator 11a are reflected by the reflection member 11b strengthen each other. .. Therefore, the sound pressure of the ultrasonic waves radiated from the ultrasonic speaker 10 increases. As a result, the volume of the audible sound heard from the sound source SS formed in the space by the ultrasonic speaker 10 can be increased.

（３−２）比較例の動作原理
比較例の動作原理について説明する。(3-2) Operating Principle of Comparative Example The operating principle of the comparative example will be described.

図４Ｂに示すように、比較例の超音波振動子モジュール９１は、複数の超音波振動子９１ａと、膜部材９２と、を備える。 As shown in FIG. 4B, the ultrasonic vibrator module 91 of the comparative example includes a plurality of ultrasonic vibrators 91a and a film member 92.

膜部材９２には、微細な通過孔９２ａが形成されている。
各超音波振動子９１ａから放射された超音波ＵＷのうち一部の超音波成分が、通過孔９２ａを経由して放射方向（Ｚ方向）に進行する。
各超音波振動子９１ａから放射された超音波ＵＷのうち通過孔９２ａを通過しない超音波成分は、膜部材９２で反射又は吸収される。A fine passage hole 92a is formed in the film member 92.
A part of the ultrasonic components of the ultrasonic UW radiated from each ultrasonic vibrator 91a travels in the radiation direction (Z direction) via the passage hole 92a.
Of the ultrasonic waves UW radiated from each ultrasonic vibrator 91a, the ultrasonic component that does not pass through the passage hole 92a is reflected or absorbed by the film member 92.

このように、比較例によれば、超音波振動子モジュール９１から放射される超音波は、膜部材９２によって減衰する。その結果、超音波振動子モジュール９１から放射される超音波によって再現される可聴音の音量が低減する。 As described above, according to the comparative example, the ultrasonic waves radiated from the ultrasonic vibrator module 91 are attenuated by the film member 92. As a result, the volume of the audible sound reproduced by the ultrasonic waves radiated from the ultrasonic vibrator module 91 is reduced.

（４）変形例
本実施形態の変形例を説明する。(4) Modification example A modification of the present embodiment will be described.

（４−１）変形例１
本実施形態の変形例１を説明する。図５は、変形例１の超音波スピーカの動作原理の説明図である。(4-1) Modification 1
A modification 1 of the present embodiment will be described. FIG. 5 is an explanatory diagram of the operating principle of the ultrasonic speaker of the first modification.

図５Ａに示すように、変形例１の第１例の反射部材１１ｂは、放射方向（Ｚ方向）に直交する方向（Ｘ方向及びＹ方向）について、各超音波振動子１１ａから離間した位置に配置される。放射方向（Ｚ方向）について、反射部材１１ｂの上端１１ｂｔは、超音波振動子１１ａの上端１１ａｔより高い位置に位置し、且つ、反射部材１１ｂの下端１１ｂｂは、超音波振動子１１ａの下端１１ａｂと同じ位置に位置する。つまりは、反射部材１１ｂは、各超音波振動子１１ａの設置面に接地される。 As shown in FIG. 5A, the reflective member 11b of the first example of the modified example 1 is located at a position separated from each ultrasonic vibrator 11a in the directions (X direction and Y direction) orthogonal to the radiation direction (Z direction). Be placed. In the radiation direction (Z direction), the upper end 11bt of the reflecting member 11b is located higher than the upper end 11at of the ultrasonic vibrator 11a, and the lower end 11bb of the reflecting member 11b is the lower end 11ab of the ultrasonic vibrator 11a. Located in the same position. That is, the reflective member 11b is grounded to the installation surface of each ultrasonic vibrator 11a.

図５Ｂに示すように、変形例１の第２例の反射部材１１ｂは、放射方向（Ｚ方向）に直交する方向（Ｘ方向及びＹ方向）について、各超音波振動子１１ａから離間した位置に配置される。放射方向（Ｚ方向）について、反射部材１１ｂの上端１１ｂｔは、超音波振動子１１ａの上端１１ａｔと下端１１ａｂとの間の位置に位置し、且つ、反射部材１１ｂの下端１１ｂｂは、超音波振動子１１ａの下端１１ａｂと同じ位置に位置する。つまりは、反射部材１１ｂは、各超音波振動子１１ａの設置面に接地される。 As shown in FIG. 5B, the reflective member 11b of the second example of the modified example 1 is located at a position separated from each ultrasonic vibrator 11a in the directions (X direction and Y direction) orthogonal to the radiation direction (Z direction). Be placed. In the radiation direction (Z direction), the upper end 11bt of the reflection member 11b is located between the upper end 11at and the lower end 11ab of the ultrasonic vibrator 11a, and the lower end 11bb of the reflection member 11b is the ultrasonic vibrator. It is located at the same position as the lower end 11ab of 11a. That is, the reflective member 11b is grounded to the installation surface of each ultrasonic vibrator 11a.

変形例１によれば、放射方向（Ｚ方向）について、超音波振動子１１ａから離間した領域に反射部材１１ｂが存在しなくても、本実施形態と同様の効果が得られる。 According to the first modification, the same effect as that of the present embodiment can be obtained even if the reflecting member 11b does not exist in the region separated from the ultrasonic vibrator 11a in the radiation direction (Z direction).

（４−２）変形例２
本実施形態の変形例２を説明する。図６は、変形例２の超音波スピーカの動作原理の説明図である。(4-2) Modification 2
A modification 2 of the present embodiment will be described. FIG. 6 is an explanatory diagram of the operating principle of the ultrasonic speaker of the modified example 2.

図６Ａに示すように、変形例２の第１例の反射部材１１ｂは、放射方向（Ｚ方向）に直交する方向（Ｘ方向及びＹ方向）について、各超音波振動子１１ａから離間した位置に配置される。放射方向（Ｚ方向）について、反射部材１１ｂの上端１１ｂｔは、超音波振動子１１ａの上端１１ａｔより高い位置に位置し、且つ、反射部材１１ｂの下端１１ｂｂは、超音波振動子１１ａの下端１１ａｂより高い位置に位置する。つまりは、反射部材１１ｂは、各超音波振動子１１ａの設置面から離間した位置に配置される。 As shown in FIG. 6A, the reflective member 11b of the first example of the modified example 2 is located at a position separated from each ultrasonic vibrator 11a in the directions (X direction and Y direction) orthogonal to the radiation direction (Z direction). Be placed. In the radiation direction (Z direction), the upper end 11bt of the reflecting member 11b is located higher than the upper end 11at of the ultrasonic vibrator 11a, and the lower end 11bb of the reflecting member 11b is located above the lower end 11ab of the ultrasonic vibrator 11a. Located in a high position. That is, the reflecting member 11b is arranged at a position separated from the installation surface of each ultrasonic vibrator 11a.

図６Ｂに示すように、変形例２の第２例の反射部材１１ｂは、放射方向（Ｚ方向）に直交する方向（Ｘ方向及びＹ方向）について、各超音波振動子１１ａから離間した位置に配置される。放射方向（Ｚ方向）について、反射部材１１ｂの上端１１ｂｔは、超音波振動子１１ａの上端１１ａｔと同じ位置に位置し、且つ、反射部材１１ｂの下端１１ｂｂは、超音波振動子１１ａの上端１１ａｔと下端１１ａｂとの間の位置に位置する。つまりは、反射部材１１ｂは、各超音波振動子１１ａの設置面から離間した位置に配置される。 As shown in FIG. 6B, the reflective member 11b of the second example of the modified example 2 is located at a position separated from each ultrasonic vibrator 11a in the directions (X direction and Y direction) orthogonal to the radiation direction (Z direction). Be placed. In the radiation direction (Z direction), the upper end 11bt of the reflecting member 11b is located at the same position as the upper end 11at of the ultrasonic vibrator 11a, and the lower end 11bb of the reflecting member 11b is the upper end 11at of the ultrasonic vibrator 11a. It is located between the lower end 11ab and the lower end 11ab. That is, the reflecting member 11b is arranged at a position separated from the installation surface of each ultrasonic vibrator 11a.

図６Ｃに示すように、変形例２の第３例の反射部材１１ｂは、放射方向（Ｚ方向）に直交する方向（Ｘ方向及びＹ方向）について、各超音波振動子１１ａから離間した位置に配置される。放射方向（Ｚ方向）について、反射部材１１ｂの上端１１ｂｔ及び下端１１ｂｂは、何れも、超音波振動子１１ａの上端１１ａｔと下端１１ａｂとの間の位置に位置する。つまりは、反射部材１１ｂは、各超音波振動子１１ａの設置面から離間した位置に配置される。 As shown in FIG. 6C, the reflective member 11b of the third example of the modified example 2 is located at a position separated from each ultrasonic vibrator 11a in the directions (X direction and Y direction) orthogonal to the radiation direction (Z direction). Be placed. In the radiation direction (Z direction), the upper end 11bt and the lower end 11bb of the reflective member 11b are both located at positions between the upper end 11at and the lower end 11ab of the ultrasonic vibrator 11a. That is, the reflecting member 11b is arranged at a position separated from the installation surface of each ultrasonic vibrator 11a.

変形例２によれば、放射方向（Ｚ方向）について、反射部材１１ｂが超音波振動子１１ａの接地面から離間していても、本実施形態と同様の効果が得られる。 According to the second modification, even if the reflecting member 11b is separated from the ground plane of the ultrasonic vibrator 11a in the radiation direction (Z direction), the same effect as that of the present embodiment can be obtained.

（５）本実施形態の小括
本実施形態について小括する。(5) Summary of the present embodiment A summary of the present embodiment will be given.

本実施形態の第１態様は、
複数の超音波振動子１１ａを備え、
超音波振動子１１ａの超音波の放射方向に直交する方向について、各超音波振動子１１ａから離間した位置に配置された反射部材１１ｂを備え、
反射部材１１ｂは、各超音波振動子１１ａから放射された超音波を反射するように構成される、
超音波スピーカ１０である。The first aspect of this embodiment is
Equipped with a plurality of ultrasonic transducers 11a,
A reflecting member 11b arranged at a position separated from each ultrasonic vibrator 11a in a direction orthogonal to the ultrasonic radiation direction of the ultrasonic vibrator 11a is provided.
The reflecting member 11b is configured to reflect the ultrasonic waves radiated from each ultrasonic vibrator 11a.
The ultrasonic speaker 10.

第１態様によれば、各超音波振動子１１ａから放射された超音波のうち直進成分以外の成分が反射部材１１ｂで反射することにより発生する反射成分と直進成分とが強め合う。したがって、超音波スピーカ１０から放射される超音波の音圧が増加する。その結果、超音波スピーカ１０によって空間上に形成される音源ＳＳから聴こえる可聴音の音量を増加させることができる。 According to the first aspect, among the ultrasonic waves radiated from each ultrasonic vibrator 11a, the reflected component generated by reflecting the component other than the straight component by the reflecting member 11b and the straight component strengthen each other. Therefore, the sound pressure of the ultrasonic waves radiated from the ultrasonic speaker 10 increases. As a result, the volume of the audible sound heard from the sound source SS formed in the space by the ultrasonic speaker 10 can be increased.

本実施形態の第２態様は、
放射方向について、反射部材１１ｂの上端は、超音波振動子１１ａの上端より高い位置に位置する、
超音波スピーカ１０である。The second aspect of this embodiment is
In the radial direction, the upper end of the reflective member 11b is located higher than the upper end of the ultrasonic vibrator 11a.
The ultrasonic speaker 10.

本実施形態の第３態様は、
放射方向について、反射部材１１ｂの上端は、超音波振動子１１ａの上端と下端との間の位置に位置する、
超音波スピーカ１０である。The third aspect of this embodiment is
In the radial direction, the upper end of the reflective member 11b is located between the upper end and the lower end of the ultrasonic vibrator 11a.
The ultrasonic speaker 10.

本実施形態の第４態様は、
放射方向について、反射部材１１ｂの下端は、超音波振動子１１ａの下端と一致する位置に位置する、
超音波スピーカ１０である。The fourth aspect of this embodiment is
In the radial direction, the lower end of the reflective member 11b is located at a position corresponding to the lower end of the ultrasonic vibrator 11a.
The ultrasonic speaker 10.

本実施形態の第５態様は、
放射方向について、反射部材１１ｂの下端は、超音波振動子１１ａの下端と上端との間の位置に位置する、
超音波スピーカ１０である。A fifth aspect of this embodiment is
In the radial direction, the lower end of the reflective member 11b is located between the lower end and the upper end of the ultrasonic vibrator 11a.
The ultrasonic speaker 10.

以上、本発明の実施形態について詳細に説明したが、本発明の範囲は上記の実施形態に限定されない。また、上記の実施形態は、本発明の主旨を逸脱しない範囲において、種々の改良や変更が可能である。また、上記の実施形態及び変形例は、組合せ可能である。 Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited to the above embodiments. Further, the above-described embodiment can be improved or modified in various ways without departing from the spirit of the present invention. Moreover, the above-described embodiment and modification can be combined.

１０ ：超音波スピーカ
１１ ：超音波振動子モジュール
１１ａ ：超音波振動子
１１ｂ ：反射部材
９１ ：超音波振動子モジュール
９１ａ ：超音波振動子
９２ ：膜部材
９２ａ ：通過孔

10: Ultrasonic speaker 11: Ultrasonic vibrator module 11a: Ultrasonic vibrator 11b: Reflecting member 91: Ultrasonic vibrator module 91a: Ultrasonic vibrator 92: Film member 92a: Passing hole

Claims (5)

複数の超音波振動子を備え、
前記超音波振動子の超音波の放射方向に直交する方向について、各超音波振動子から離間した位置に配置された反射部材を備え、
前記反射部材は、各超音波振動子から放射された超音波のうち第１方向の成分と第２方向の成分とを反射するように構成され、
前記第１方向および前記第２方向は、互いに直交し、かつ前記超音波の放射方向と直交する、
超音波スピーカ。 Equipped with multiple ultrasonic transducers
A reflecting member arranged at a position separated from each ultrasonic vibrator in a direction orthogonal to the ultrasonic radiation direction of the ultrasonic vibrator is provided.
The reflecting member is configured to reflect a component in the first direction and a component in the second direction of the ultrasonic waves radiated from each ultrasonic vibrator.
The first direction and the second direction are orthogonal to each other, and you perpendicular to the radial direction of the ultrasonic wave,
Ultrasonic speaker. 前記放射方向について、前記反射部材の上端は、前記超音波振動子の上端より高い位置に位置する、
請求項１に記載の超音波スピーカ。 In the radial direction, the upper end of the reflective member is located higher than the upper end of the ultrasonic vibrator.
The ultrasonic speaker according to claim 1. 前記放射方向について、前記反射部材の上端は、前記超音波振動子の上端と下端との間の位置に位置する、
請求項１に記載の超音波スピーカ。 In the radial direction, the upper end of the reflective member is located between the upper and lower ends of the ultrasonic transducer.
The ultrasonic speaker according to claim 1. 前記放射方向について、前記反射部材の下端は、前記超音波振動子の下端と一致する位置に位置する、
請求項１〜３の何れかに記載の超音波スピーカ。 The lower end of the reflective member is located at a position corresponding to the lower end of the ultrasonic vibrator in the radial direction.
The ultrasonic speaker according to any one of claims 1 to 3. 前記放射方向について、前記反射部材の下端は、前記超音波振動子の下端と上端との間の位置に位置する、
請求項１〜３の何れかに記載の超音波スピーカ。
In the radial direction, the lower end of the reflective member is located between the lower and upper ends of the ultrasonic transducer.
The ultrasonic speaker according to any one of claims 1 to 3.
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