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Provided is an electronic device including a housing and an acoustic device configured to generate vibration sound that is transmitted through vibration of a part of a human body. The acoustic device includes a panel configured to be joined to the housing; a piezoelectric element configured to be jo

Provided is an electronic device including a housing and an acoustic device configured to generate vibration sound that is transmitted through vibration of a part of a human body. The acoustic device includes a panel configured to be joined to the housing; a piezoelectric element configured to be joined to the panel for vibrating the panel; and a vibration adjusting unit configured to be joined to the panel and vibrated together with the panel by the piezoelectric element. With the above configuration, a frequency characteristic is improved.

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1. An electronic device comprising: a housing; andan acoustic device configured to generate vibration sound that is transmitted by vibrating a part of a human body, whereinthe acoustic device includes:a panel configured to be joined to the housing;a piezoelectric element configured to be joined to t

1. An electronic device comprising: a housing; andan acoustic device configured to generate vibration sound that is transmitted by vibrating a part of a human body, whereinthe acoustic device includes:a panel configured to be joined to the housing;a piezoelectric element configured to be joined to the panel for vibrating the panel; anda vibration adjusting unit configured to be joined to the panel and vibrated together with the panel by the piezoelectric element, and whereinthe acoustic device transmits sound by bending the panel with the piezoelectric element such that a portion of the panel directly above the piezoelectric element protrudes relative to neighboring portions of the panel in a long side direction of the piezoelectric element and by vibrating a contacting part of a human body that is in contact with the bent panel, and the acoustic device has a resonance frequency within a frequency range used for a sound function, and whereinthe vibration occurs in an area of the panel that is larger than an area having a length corresponding to a distance from an inferior crus of antihelix to an antitragus and a width corresponding to a distance from a tragus to an antihelix of an ear of the human body. 2. The electronic device of claim 1, wherein the vibration adjusting unit comprises a display unit configured to display predetermined information. 3. The electronic device of claim 1, wherein the panel has a resonance frequency within a range outside the-frequency range used. 4. The electronic device of claim 1, wherein the piezoelectric element has a resonance frequency within a range outside the frequency range used. 5. The electronic device of claim 1, further comprising: a voice communication function, whereinthe acoustic device is configured to generate air-conduction sound and vibration sound that correspond to sound in voice communication, andthe frequency range used is from 0.4 kHz to 3.4 kHz. 6. The electronic device of claim 1, further comprising: an amplifier configured to amplify a signal applied to the piezoelectric element. 7. The electronic device of claim 1, wherein a length of the panel in a direction extending from a joining portion of the piezoelectric element to a joining portion of the vibration adjusting unit is greater than or equal to a length from the antitragus to the inferior crus of antihelix. 8. The electronic device of claim 1, wherein a length of the panel in a direction intersecting with the direction extending from the joining portion of the piezoelectric element to the joining portion of the vibration adjusting unit is greater than or equal to a length from the tragus to the antihelix. 9. The electronic device of claim 1, wherein the piezoelectric element is joined to the panel by a joining member. 10. The electronic device of claim 9, wherein the joining member comprises a non-thermosetting adhesive agent. 11. The electronic device of claim 9, wherein the joining member comprises a double-sided adhesive tape. 12. The electronic device of claim 1, wherein the panel is joined to the housing by a joining member. 13. The electronic device of claim 12, wherein the joining member comprises a non-thermosetting adhesive agent. 14. The electronic device of claim 12, wherein the joining member comprises a double-sided adhesive tape. 15. The electronic device of claim 1, wherein the panel forms a part or an entirety of any of a display unit, an input unit, a cover of the display unit, and a lid portion that allows a battery to be detachable. 16. The electronic device of claim 2, wherein a joining portion of the piezoelectric element in the panel is located outside of an overlapping area between the panel and the vibration adjusting unit. 17. The electronic device of claim 1, wherein the panel is larger than an ear. 18. The electronic device of claim 1, wherein the panel comprises a panel for display. 19. The electronic device of claim 18, wherein the piezoelectric element is disposed outside of a display area provided for a display function. 20. An electronic device comprising: a housing; andan acoustic device configured to generate vibration sound that is transmitted by vibrating a part of a human body, whereinthe acoustic device includes:a panel configured to be joined to the housing;a piezoelectric element configured to be joined to the panel for vibrating the panel; anda vibration adjusting unit configured to be joined to the panel and vibrated together with the panel by the piezoelectric element, and whereinthe acoustic device transmits sound by bending the panel with the piezoelectric element such that a portion of the panel directly above the piezoelectric element protrudes relative to neighboring portions of the panel in a long side direction of the piezoelectric element and by vibrating a pressed part of a human body that is pressed against the bent panel, and the acoustic device has a resonance frequency within a frequency range used for a sound function, and whereinthe vibration occurs in an area of the panel that is larger than an area having length corresponding to a distance from an inferior crus of antihelix to an antitragus and a width corresponding to a distance from a tragus to an antihelix of an ear of the human body. 21. The electronic device of claim 20, wherein, when pressed with force greater than or equal to 3 N, the pressed part is vibrated, and sound is transmitted. 22. The electronic device of claim 20, wherein, when pressed with force greater than or equal to 5 N, the pressed part is vibrated, and sound is transmitted. 23. The electronic device of claim 20, wherein, when pressed with force less than or equal to 10 N, the pressed part is vibrated, and sound is transmitted.