Abstract: In an electro-acoustic transducer 100 which is an oscillator device, center positions of principal surfaces of piezoelectric elements 130 that are positioned on both surfaces of an elastic member 120 are different from each other. As such, since the two piezoelectric elements 130 are disposed asymmetrically on the upper and lower sides in the electro-acoustic transducer 100, it is possible to prevent vibrations of reversed phases at the time of divided vibration in which the reversed phases overlap with each other. In other words, since it is possible to prevent the generation of sound waves due to the vibration of local reversed phases, the sound pressure level can be improved.

Abstract: Provided is an oscillator (100) including a piezoelectric body (70) that has a plurality of protrusions (72) on one surface thereof, a plurality of electrodes (80) that are respectively provided on the plurality of protrusions (72) so as to be separated from each other, and a plurality of electrodes (82) that are provided on the other surface opposite to the one surface of the piezoelectric body (70) so that each of the electrodes faces only one electrode (80). Thus, it is possible to prevent variation in acoustic characteristics from occurring. Therefore, the oscillator capable of improving the acoustic characteristics of an electronic device is provided.

Abstract: Disclosed is an electronic device including: a housing (110) in which at least one sound hole (113) and at least one sound hole (114) are formed; an oscillator (120) that is provided inside the housing (110) and outputs a modulated wave for a parametric loudspeaker; a sound demodulation unit (130) that is not provided in the sound hole (113) but provided in the sound hole (114) and demodulates the modulated wave; and a sound hole opening and closing unit (112) that is mounted to the housing (110) and opens and closes the sound hole (113).

Abstract: There is provided an electroacoustic transducer including: an oscillation device (10) that outputs a sound wave (30) from a first vibrating surface, and outputs a sound wave (32), having an opposite phase to that of the sound wave (30), from a second vibrating surface which is opposite to the first vibrating surface; a waveguide (40) that is provided on the first vibrating surface and that includes an open end (46); a waveguide (50) that is provided on the second vibrating surface, and includes an open end (56) which faces the same direction as the open end (46); and a sound wave filter (80) that is provided in the waveguide (50) and attenuates the sound wave (32).

Abstract: A vibration member (140) has a sheet shape. A piezoelectric element (130) is attached to one surface of the vibration member (140). A support member (110) supports the edge of the vibration member (140). The support member (110) includes a first facing portion (112) and a second facing portion (114). The first facing portion (112) faces the surface of the vibration member (140) to which the piezoelectric element (130) is attached. The second facing portion (114) faces the surface of the vibration member (140) which is located on the opposite side to the piezoelectric element (130). A first spring (152) is provided between the first facing portion (112) and the vibration member (140) or the piezoelectric element (130). A second spring (154) is provided between the second facing portion (114) and the vibration member (140).

Abstract: An oscillation device includes: a piezoelectric vibrator (110) in which electrode layers (112, 113) are formed over top and bottom surfaces of a piezoelectric layer (111); a vibrating member (120) having at least atop surface to which the piezoelectric vibrator (110) is bonded; and a resin member (130) formed continuously in a circumferential direction over at least the outer side surface of the piezoelectric vibrator (110). Therefore, since it is possible to increase the working area of the piezoelectric vibrator, it is possible to realize both an increase in the sound pressure level of the output and miniaturization of the apparatus.

Abstract: A mobile phone (100) detects at least a direction of an utterance position of a user from the voice input to a plurality of microphones (121,122) and controls an output direction of a voice out of a speaker unit (110) to match the detected utterance position. Accordingly, it is possible to provide sound with sufficient volume only for a specific user without causing noise in the neighborhood. The microphones may form a matrix together with piezoelectric vibrators that form a speaker unit, or may be formed separately from the speaker unit.

Abstract: A viscoelastic body is interposed between a vibrating membrane vibrating in association with a piezoelectric vibrator composed of a piezoelectric element and a base and a support member supporting the vibrating membrane. The viscoelastic body attenuates vibration transmitted from the support member to the vibrating membrane and converts vibration of the vibrating membrane in the surface direction parallel to its main surfaces to vibration of the vibrating membrane in the direction nearly perpendicular to the surface direction. The vibrating membrane is annular with an opening at the center, and the base is joined to the vibrating membrane coaxially with opening.

Abstract: Provided is an electronic device including a modulation unit (22) that modulates a sound signal to a modulation wave for a parametric speaker; an oscillator (12) to which the modulation wave is input; an equalizer (26) that corrects a frequency characteristic of a sound wave that is demodulated by the modulation wave; and a control unit (20) that selects a carrier frequency of the modulation wave and changes setting of the equalizer (26) on the basis of the selected carrier frequency. Thus, it is possible to provide the electronic device capable of correcting the frequency characteristic of the sound wave that is demodulated, for each carrier frequency of the modulation wave.

Abstract: An oscillator includes a piezoelectric vibrator (10), a vibrating member (20) which is larger than the piezoelectric vibrator (10) when seen in a plan view and restrains one surface of the piezoelectric vibrator (10), a vibrating member (25) which is larger than the piezoelectric vibrator (10) when seen in a plan view and restrains the other surface of the piezoelectric vibrator (10), an elastic member (30) which supports an edge of the surface of the vibrating member (20), which restrains the piezoelectric vibrator (10), and supports an edge of the surface of the vibrating member (25), which restrains the piezoelectric vibrator (10), and a supporting member (35) which is located around the elastic member (30) and supports the elastic member (30).

Abstract: Provided is an oscillator including a piezoelectric vibrator (10), a vibration member (20) that constrains the piezoelectric vibrator (10) on one surface thereof, an elastic member (40) that is provided on one surface of the vibration member (20) or the other surface opposite to one surface and provided so as to be located between edges of the piezoelectric vibrator (10) and the vibration member (20) when seen in a plan view, a fixing member (42) that is provided on one surface or the other surface of the vibration member (20) and provided so as to be located between the piezoelectric vibrator (10) and the elastic member (40) when seen in a plan view, and a supporting member (30) that supports the vibration member (20) through the elastic member (40) and the fixing member (42).

Abstract: A speaker device (100) includes a circuit board (10), a piezoelectric element (20), a spacer (30) which is disposed between the piezoelectric element (20) and the circuit board (10), and an air chamber (40). The spacer (30) fixes the piezoelectric element (20) to the circuit board (10) so that an internal space (31) is formed between the piezoelectric element (20) and the circuit board (10). The internal space (31) and the air chamber (40) communicate with each other. For example, the internal space (31) and the air chamber (40) communicate with each other through only an air medium.

Abstract: A plurality of magnetostrictive elements made of ferrite or the like are arranged in a matrix on an upper surface of a circuit board. On the periphery of each of the magnetostrictive elements, a voice coil is arranged. When current flows to the voice coils, the magnetostrictive elements themselves expand and contract in their center axis direction (height direction), and whereby ultrasonic waves (carrier waves) are emitted into the air from the magnetostrictive elements themselves. Since the magnetostrictive elements made of ferrite or the like are used, power consumption can be reduced, compared with the case of using piezoelectric vibrators. Also, the magnetostrictive elements can be made resistant to damage even if subjected to an impact due to falling or the like. Accordingly, in a parametric speaker using ultrasonic waves as carrier waves, power consumption can be reduced and vibrating elements can be made resistant to impact damage.

Abstract: A vibration member (140) has a sheet shape. A piezoelectric element (130) is attached to one surface of the vibration member (140). A support member (110) supports the edge of the vibration member (140). The support member (110) includes a first facing portion (112) and a second facing portion (114). The first facing portion (112) faces the surface of the vibration member (140) to which the piezoelectric element (130) is attached. The second facing portion (114) faces the surface of the vibration member (140) which is located on the opposite side to the piezoelectric element (130). A first spring (152) is provided between the first facing portion (112) and the vibration member (140) or the piezoelectric element (130). A second spring (154) is provided between the second facing portion (114) and the vibration member (140).

Abstract: There are provided a vibration film (21) having a piezoelectric element, a magnetic circuit (20) which generates magnetic force on the basis of a first electric signal and vibrates the vibration film (21) by the magnetic force; and an adjustment unit (31) which generates a second electric signal on the basis of the first electric signal and applies a voltage based on the second electric signal between both surfaces of the piezoelectric element. The amplitude of the entire vibration film (21) is expanded by making the vibration by the magnetic force, which is generated from the magnetic circuit (20), and the vibration, which is generated by application of a voltage to the piezoelectric element, synchronize with each other.

Abstract: A second piezoelectric vibrator (30) is located in a hollow portion (21) of the first piezoelectric vibrator (20) when seen in a plan view. A support (40) is a frame-shaped member, and the inside surface thereof supports the edge of a vibration member (10). The fundamental resonance frequency of the first piezoelectric vibrator (20) is lower than the fundamental resonance frequency of the second piezoelectric vibrator (30). In addition, the second piezoelectric vibrator (30) overlaps a loop of vibration generated in the vibration member (10) when the first piezoelectric vibrator (20) is driven at the fundamental resonance frequency. Preferably, the center of the second piezoelectric vibrator (30) overlaps the center of a loop of vibration generated in the vibration member (10) by the first piezoelectric vibrator (20).

Abstract: In an oscillator (100), a plurality of piezoelectric vibrators (111 to 113) supported by vibrator support mechanisms (120) individually output highly directional sound waves. The plurality of piezoelectric vibrators (111 to 113) is formed by dividing a laminated body of an elastic member and a piezoelectric substance by the vibrator support mechanisms (120). Since it is not necessary to arrange the plurality of piezoelectric vibrators in a matrix, the entirety of a device can be small-sized. A sound deflection unit that deflects a sound wave which is output by at least one of the piezoelectric vibrators may be further included.

Abstract: An elastic vibration plate (110) is divided into a plurality of elastic vibrating regions (112) through slits (111) having a predetermined shape, a plurality of piezoelectric vibrators (120) which are individually mounted on at least some of the plurality of elastic vibrating regions (112) on the elastic vibration plate (110) undergo elastic vibration due to application of an electric field. Therefore, it is possible to vibrate the plurality of elastic vibrating regions (112) on a single elastic vibration plate (110) using the plurality of piezoelectric vibrators (120). Therefore, it is possible to adjust the peak value and the like of the oscillation frequency at will in each of the plurality of elastic vibrating regions.

Abstract: An oscillation device (100) includes a piezoelectric element (121), a vibrating member (122) which binds one surface of the piezoelectric element (121) and is formed of a metal material, a resin member (123) which holds an outer circumferential portion of the vibrating member (122), a piezoelectric element (111), a vibrating member (122) which binds one surface of the piezoelectric element (111), is overlapped with the vibrating member (121) and the resin member (123) when seen in a plan view, and is formed of a metal material, and a support member (140) which supports the resin member (123) and the vibrating member (112), wherein at least one opening (150), which connects a space (170) positioned between the vibrating member (121) and the resin member (123), and the vibrating member (122) to the outside of the space (170), is provided in at least one of the vibrating member (121), the resin member (123), and the vibrating member (112).

Abstract: Provided is an electronic device including a modulation unit (22) that modulates a sound signal to a modulation wave for a parametric speaker; an oscillator (12) to which the modulation wave is input; an equalizer (26) that corrects a frequency characteristic of a sound wave that is demodulated by the modulation wave; and a control unit (20) that selects a carrier frequency of the modulation wave and changes setting of the equalizer (26) on the basis of the selected carrier frequency. Thus, it is possible to provide the electronic device capable of correcting the frequency characteristic of the sound wave that is demodulated, for each carrier frequency of the modulation wave.