Abstract: [Problem.] The present invention is directed to a higher-performance and higher-quality curved diaphragm. speaker system without deficiency of performance for both a hearing-impaired person and a normal hearing person. [Solution] A speaker unit 10 according to the present invention includes at least a first diaphragm 1 having a corn shape, a second diaphragm 2 having a curved sheet shape, and a driver unit 3 that drives both the first diaphragm and the second diaphragm. A small diameter side 1a of the first diaphragm and one end side 2a of the second diaphragm. are coupled to the driver unit. When the speaker unit is mounted in a housing 50 to be a speaker 100, a large diameter side 1b of the first diaphragm is coupled to a support plate 511 of a support member 51 that is a part of the housing, and the other end side 2b of the second diaphragm is coupled to a support leg 513 of the support member that is a part of the housing.

Abstract: [Problem] To provide a speaker that is capable of emitting higher-volume and clearer sounds which hard-of-hearing individuals and hearing individuals can hear together without inconvenience by not suppressing vibration of the curved diaphragm and therefore efficiently transmitting kinetic energy converted from the electric energy of a sound signal to a curved diaphragm, and also has a reduced weight and size and is easy to manufacture. [Solution] A speaker 10 of the present invention includes: a diaphragm 1 curved in one direction; a driver unit 2 that vibrates the diaphragm in accordance with an inputted electric signal; and a frame body 3 supporting the diaphragm and the driver unit. One end side and another side of the diaphragm in the direction of curvature are attached to the frame body via edge parts 15 that do not interfere with the vibration. Also, the driver unit is in contact with one surface of the diaphragm and fixedly attached to the frame body.

Abstract: [Problem] To provide a universal speaker that efficiently transmits kinetic energy that has been converted from electrical energy of an audio signal to one or more diaphragms, and enables both healthy individuals and the hard of hearing to comfortably hear as a result of higher-volume and sharp emitted-sound. [Solution] This universal speaker (10) is provided at least with a diaphragm (1) having a planar shape, a driver unit (2) for causing the diaphragm to vibrate in accordance with an inputted electrical signal, and an enclosure (3) with a hollow structure for accommodating the diaphragm and the driver unit. The enclosure has an opening (39) at one surface, and the driver unit abuts against an end edge of the diaphragm so as to drive in the same direction as the plane direction of the diaphragm and is also fixedly mounted onto the enclosure.

Abstract: [Problem] To provide a universal speaker that efficiently transmits kinetic energy that has been converted from electrical energy of an audio signal to one or more diaphragms, and enables both healthy individuals and the hard of hearing to comfortably hear as a result of higher-volume and sharp emitted-sound. [Solution] This universal speaker (10) is provided at least with a diaphragm (1) having a planar shape, a driver unit (2) for causing the diaphragm to vibrate in accordance with an inputted electrical signal, and an enclosure (3) with a hollow structure for accommodating the diaphragm and the driver unit. The enclosure has an opening (39) at one surface, and the driver unit abuts against an end edge of the diaphragm so as to drive in the same direction as the plane direction of the diaphragm and is also fixedly mounted onto the enclosure.

Abstract: An optical acoustoelectric transducer having a directivity pattern like a better 8 by receiving by a light-receiving element a reflected fraction of the light from a light-emitting device disposed at the center of a bottom plate that is parallel to a diaphragm, has an opening through which an acoustic wave enters, and is connected to supporting side plates. An optical acoustoelectric transducer having uniform amplitude characteristics in a wide frequency range by mixing by a mixer circuit the outputs of a plurality of optical microphones having diaphragms of mutually different thicknesses so as to make the receiving sensitivity uniform in different frequency ranges. A directional optical acoustoelectric transducer having a small size and wide band characteristics by arranging a plurality of light-emitting devices (LD) and a plurality of light-receiving elements (PD) corresponding to a plurality of diaphragms arranged parallel.

Abstract: An optical acoustoelectric transducer receives light reflected by a vibrating board and detects the displacement of the vibrating board. A surface-emitting luminescent device having a substantially uniform concentric intensity distribution of light emission is placed in the center of a common substrate. A photodetector element is provided to surround the luminescent device. A lens is also provided in the optical path between the substrate and the vibrating board to converge the light traveling toward and from the vibrating board.

Abstract: An optical acoustoelectric transducer having a directivity pattern like a better 8 by receiving by a light-receiving element a reflected fraction of the light from a light-emitting device disposed at the center of a bottom plate that is parallel to a diaphragm, has an opening through which an acoustic wave enters, and is connected to supporting side plates. An optical acoustoelectric transducer having uniform amplitude characteristics in a wide frequency range by mixing by a mixer circuit the outputs of a plurality of optical microphones having diaphragms of mutually different thicknesses so as to make the receiving sensitivity uniform in different frequency ranges. A directional optical acoustoelectric transducer having a small size and wide band characteristics by arranging a plurality of light-emitting devices (LD) and a plurality of light-receiving elements (PD) corresponding to a plurality of diaphragms arranged parallel.

Abstract: A device for collecting sounds from objects comprises a plurality of microphones whose directivity can be varied depending on the environment in which each object is located. An optical microphone includes a vibration board (2) which vibrates by sound pressure, a light source (3) for emitting a light beam to the vibration board (2), a photodetector (5) which receives the light beam reflected from the vibration board (2) and produces a signal corresponding to the vibration of the vibration board (2), a drive circuit (13) for supplying the light source (3) with predetermined current, and a negative feedback circuit (100) that supplies the drive circuit (13) with a negative feedback signal consisting of a signal output from the photodetector (5). The negative feedback circuit (100) changes the amount of negative feedback depending on the environment.

Abstract: An optical microphone having enhanced sensitivity only along a specified axis and free from the effect of ambient noises. The optical microphone comprises a diaphragm (2) vibrating with sound pressure, a light source (3) for irradiating the diaphragm (2) with a light beam, a photodetector (5) for receiving a fraction of the light reflected from the diaphragm (2) and outputting a signal corresponding to the vibration of the diaphragm (2), and a light source driving circuit (13) for driving the light source (3) by supplying a specified current. The optical microphone is additionally provided with a negative feedback circuit (100) for supplying the light source driving circuit (13) with a part of the output signal from the photodetector (5) as a negative feedback signal.

Abstract: A device for collecting sounds from objects comprises a plurality of microphones whose directivity can be varied depending on the environment in which each object is located. An optical microphone includes a vibration board (2) which vibrates by sound pressure, a light source (3) for emitting a light beam to the vibration board (2), a photodetector (5) which receives the light beam reflected from the vibration board (2) and produces a signal corresponding to the vibration of the vibration board (2), a drive circuit (13) for supplying the light source (3) with predetermined current, and a negative feedback circuit (100) that supplies the drive circuit (13) with a negative feedback signal consisting of a signal output from the photodetector (5). The negative feedback circuit (100) changes the amount of negative feedback depending on the environment.

Abstract: A video camera with a microphone having controllable directivity characteristics to an object in synchronism with focusing of the video camera to the object. The microphone is an optical microphone (300) comprising a diaphragm (2) vibrating with sound pressure, a light source (3) for irradiating the diaphragm (2) with a light beam, a photodetector (5) for receiving part of the light beam reflected from the diaphragm (2) and outputting a signal corresponding to the vibration of the diaphragm, a circuit (13) for driving the light source (3) by supplying a predetermined current, and a negative feedback circuit (100) for supplying a part of the signal outputted from the photodetector (5) to the light source driving circuit (13) as a negative feedback signal. The directivity characteristics of the optical microphone (300) are controlled by varying the magnitude of the negative feedback signal with a zooming signal indicative of the zooming amount of the video camera with respect to the object.

Abstract: An optical microphone element comprising a diaphragm (31) vibrating with sound pressure, a case (40) containing the diaphragm (31) and having first and second openings (38, 39) made in symmetric positions and facing the diaphragm (31), a light source (32) for irradiating the diaphragm (31) with a light beam, and a photodetector (35) for receiving the light beam reflected by the diaphragm (31) and outputting a signal corresponding to vibration of the diaphragm (31).