Abstract: An acoustic diaphragm 1 according to the present invention includes a center dome member, and a sub dome member. The center dome member includes a center dome 2 and an annular first plane part 2a that is disposed along the outer periphery of the center dome and formed integrally with the center dome. The sub dome member includes a sub dome 3 and an annular second plane part 3a that is disposed along the inner periphery of the sub dome and formed integrally with the sub dome. The first plane part includes a rising part 2b of the center dome, a first front surface, and a first back surface. The second plane part includes an inner peripheral edge 3b, a second front surface, and a second back surface. The center dome is formed of a material different from that of the sub dome. The sub dome surrounds the periphery of the center dome. The inner peripheral edge coincides with the rising part. The first front surface is joined to the second back surface.

Abstract: An acoustic diaphragm 1 according to the present invention includes a center dome member, and a sub dome member. The center dome member includes a center dome 2 and an annular first plane part 2a that is disposed along the outer periphery of the center dome and formed integrally with the center dome. The sub dome member includes a sub dome 3 and an annular second plane part 3a that is disposed along the inner periphery of the sub dome and formed integrally with the sub dome. The first plane part includes a rising part 2b of the center dome, a first front surface, and a first back surface. The second plane part includes an inner peripheral edge 3b, a second front surface, and a second back surface. The center dome is formed of a material different from that of the sub dome. The sub dome surrounds the periphery of the center dome. The inner peripheral edge coincides with the rising part. The first front surface is joined to the second back surface.

Abstract: An acoustic diaphragm 1 according to the present invention includes a center dome member, and a sub dome member. The center dome member includes a center dome 2 and an annular first plane part 2a that is disposed along the outer periphery of the center dome and formed integrally with the center dome. The sub dome member includes a sub dome 3 and an annular second plane part 3a that is disposed along the inner periphery of the sub dome and formed integrally with the sub dome. The first plane part includes a rising part 2b of the center dome, a first front surface, and a first back surface. The second plane part includes an inner peripheral edge 3b, a second front surface, and a second back surface. The center dome is formed of a material different from that of the sub dome. The sub dome surrounds the periphery of the center dome. The inner peripheral edge coincides with the rising part. The first front surface is joined to the second back surface.

Abstract: Provided is a wireless earphone capable of suppressing an influence on the sound quality of an electroacoustic transducer due to the arrangement of electrical parts such as a battery and a circuit board while reducing the size of a casing. The wireless earphone includes an electroacoustic transducer 14 that outputs a sound wave corresponding to a sound signal from a sound source S, a reception circuit 151 that receives the sound signal from the sound source S via a wireless communication line, a circuit board 15 to which the reception circuit 151 is attached, and a casing 11 that accommodates the circuit board 15 and the electroacoustic transducer 14. The casing 11 includes a first casing 11A that accommodates the electroacoustic transducer 14, and a second casing 11B that accommodates the circuit board 15.

Abstract: An acoustic diaphragm 1 according to the present invention includes a center dome member, and a sub dome member. The center dome member includes a center dome 2 and an annular first plane part 2a that is disposed along the outer periphery of the center dome and formed integrally with the center dome. The sub dome member includes a sub dome 3 and an annular second plane part 3a that is disposed along the inner periphery of the sub dome and formed integrally with the sub dome. The first plane part includes a rising part 2b of the center dome, a first front surface, and a first back surface. The second plane part includes an inner peripheral edge 3b, a second front surface, and a second back surface. The center dome is formed of a material different from that of the sub dome. The sub dome surrounds the periphery of the center dome. The inner peripheral edge coincides with the rising part. The first front surface is joined to the second back surface.

Abstract: A headphone is provided that includes a driver unit securely fixed to the baffle plate with a simple structure and has desirable frequency characteristics in a high frequency range and a low frequency range. A headphone includes a baffle plate, a driver unit fixed to the baffle plate, and a fixing member fixing the driver unit to the baffle plate. The fixing member includes a contact part having a shape of a plate in contact with the outer edge of the driver unit.

Abstract: A diaphragm and an electroacoustic transducer that suppress the influence to the lowest resonant frequency and enhance the mechanical strength includes a main dome, an auxiliary dome extending from an outer peripheral edge of the main dome, and a reinforcing member disposed on a boundary between the main dome and the auxiliary dome. The reinforcing member is disposed so as not to reach an outer peripheral edge of the auxiliary dome.

Abstract: A headphone includes a baffle plate, a driver unit attached to the baffle plate, a housing forming a back cavity at a front side of the baffle plate and the driver unit, and an ear pad attached to a peripheral edge portion of the baffle plate at a front side and forming the front cavity at the front side of the baffle plate, and the baffle plate includes at least one through hole that allows the back cavity and the front cavity to acoustically communicate with each other. The sound wave emitted from the driver unit to the back cavity passes through the through hole and cancels a low-frequency range sound wave of a sound wave emitted from the driver unit to the front cavity, so that sound quality in a low-frequency range is improved.

Abstract: A headphone is provided that includes a driver unit securely fixed to the baffle plate with a simple structure and has desirable frequency characteristics in a high frequency range and a low frequency range. A headphone includes a baffle plate, a driver unit fixed to the baffle plate, and a fixing member fixing the driver unit to the baffle plate. The fixing member includes a contact part having a shape of a plate in contact with the outer edge of the driver unit.

Abstract: A headphone includes a baffle plate, a driver unit attached to the baffle plate, a housing forming a back cavity at a front side of the baffle plate and the driver unit, and an ear pad attached to a peripheral edge portion of the baffle plate at a front side and forming the front cavity at the front side of the baffle plate, and the baffle plate includes at least one through hole that allows the back cavity and the front cavity to acoustically communicate with each other. The sound wave emitted from the driver unit to the back cavity passes through the through hole and cancels a low-frequency range sound wave of a sound wave emitted from the driver unit to the front cavity, so that sound quality in a low-frequency range is improved.

Abstract: The earphone includes a driver unit; a housing accommodating the driver unit, the housing having a front face serving as a sound emitting surface and a bowl shaped rear face; a hollow casing provided separately from the housing, the casing being configured to increase an internal volume adjacent to the rear side of a vibrating plate and to reduce the back pressure of the vibrating plate; and a connecting channel connecting the rear face of the housing and the casing such that the housing is in communication with the internal space of the casing, in which the housing includes a sound emitting tube protruding from the front face thereof so as to be fitted into an external auditory meatus.

Abstract: The earphone includes a driver unit; a housing accommodating the driver unit, the housing having a front face serving as a sound emitting surface and a bowl shaped rear face; a hollow casing provided separately from the housing, the casing being configured to increase an internal volume adjacent to the rear side of a vibrating plate and to reduce the back pressure of the vibrating plate; and a connecting channel connecting the rear face of the housing and the casing such that the housing is in communication with the internal space of the casing, in which the housing includes a sound emitting tube protruding from the front face thereof so as to be fitted into an external auditory meatus.