Patent ID: 9143867
Filing Date: 2015-09-22
Classification: H04M,H04R

Abstract:
1. An electronic device comprising: a piezoelectric element; a vibration plate to which the piezoelectric element is joined for vibration; and a housing to which the vibration plate is joined, wherein sound is transmitted by bending the vibration plate with the piezoelectric element such that a portion of the vibration plate directly above the piezoelectric element protrudes relative to neighboring portions of the vibration plate 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 vibration plate, and wherein the vibration plate includes, in a plan view thereof, a first area including a joining portion with the piezoelectric element and a second area located further away from the joining portion than the first area is, and rigidity in the first area is lower than rigidity in the second area, and wherein the vibration occurs in an area of the vibration plate that is larger than an area having a length corresponding to a distance from a helix to a tragus and an antitragus, and a width corresponding to a distance from a crus helicis to an antihelix of an ear of the human body.