摘要:
An object is to achieve excellent sound pressure frequency characteristics. To achieve such an object, an acoustic generator (1) according to one embodiment includes a piezoelectric element (exciter) (5), a vibrating portion (3a), and a plurality of dampers (8). The piezoelectric element (5) receives an input of an electrical signal and is caused to vibrate. The piezoelectric element (5) is mounted on the vibrating portion (3a), and the vibrating portion (3a) is caused to vibrate by the vibration of the piezoelectric element (5). The dampers (8) are integrated with the vibrating portion (3a). The dampers (8) are asymmetrically provided with respect to an axis of symmetry of a shape delineated by the outline of the vibrating portion (3a), in a plan view of the vibrating portion (3a) from a side on which the piezoelectric element (5) is mounted.
摘要:
An object is to provide an acoustic generator with excellent sound pressure frequency characteristics. To achieve such an object, an acoustic generator (1) according to one embodiment includes a piezoelectric element (exciter) (5), a vibrating body (3a), a frame (support) (2), and a damper (8). The piezoelectric element (5) receives an input of an electrical signal and is caused to vibrate. The piezoelectric element (5) is mounted on the vibrating body (3a), and the vibrating body (3a) is caused to vibrate by the vibration of the piezoelectric element (5). The frame (2) supports the vibrating body (3a). The damper (8) is provided contacting with both of a pair of two adjacent portions with different stiffnesses in a plan view.
摘要:
The problem is to reduce variations of sound pressure in the sound pressure frequency characteristics. To solve the problem, an acoustic generator includes a film (3) that is a supporting plate; a frame member (5) that is provided on the outer circumference of the film (3); a piezoelectric element (1) that is provided on the film (3) within a frame of the frame member (5); and a resin layer (20) that is provided on the film (3) within the frame of the frame member (5), and the resin layer (20) including an air bubble (8). By the air bubble (8), a decrease in the sound pressure is prevented, peaks and dips in the frequency characteristics of sound pressure are reduced, and high-quality sounds are generated.
摘要:
An ultrasound emission device includes a generation part which generates an ultrasonic wave emitted to an object side, and a bag in which a liquid is sealed so that the liquid is located on the object side relative to the generation part. The generation part includes a piezoelectric element which generates vibration generating the ultrasonic wave. The piezoelectric element includes a first surface facing the object side and a second surface facing an opposite side to the object side. The piezoelectric element includes, between the first surface and the second surface, a piezoelectric layer which extends along the first surface and the second surface, and a pair of electrodes which are superposed on two surfaces of the piezoelectric layer. The piezoelectric element flexurally deforms so that the first surface and the second surface flex to a same side as each other. The first surface is exposed to the inside of the bag so as to contact the liquid. The second surface is isolated from the liquid and is in contact with a gas.
摘要:
An object is to achieve excellent sound pressure frequency characteristics. To achieve such an object, an acoustic generator (1) according to one embodiment includes a piezoelectric element (exciter) (5), a vibrating portion (3a), and a plurality of dampers (8). The piezoelectric element (5) receives an input of an electrical signal and is caused to vibrate. The piezoelectric element (5) is mounted on the vibrating portion (3a), and the vibrating portion (3a) is caused to vibrate by the vibration of the piezoelectric element (5). The dampers (8) are integrated with the vibrating portion (3a). The dampers (8) are asymmetrically provided with respect to an axis of symmetry of a shape delineated by the outline of the vibrating portion (3a), in a plan view of the vibrating portion (3a) from a side on which the piezoelectric element (5) is mounted.
摘要:
An object is to provide an acoustic generator with excellent sound pressure frequency characteristics. To achieve such an object, an acoustic generator (1) according to one embodiment includes a piezoelectric element (exciter) (5), a vibrating body (3a), a frame (support) (2), and a damper (8). The piezoelectric element (5) receives an input of an electrical signal and is caused to vibrate. The piezoelectric element (5) is mounted on the vibrating body (3a), and the vibrating body (3a) is caused to vibrate by the vibration of the piezoelectric element (5). The frame (2) supports the vibrating body (3a). The damper (8) is provided contacting with both of a pair of two adjacent portions with different stiffnesses in a plan view.