Abstract: An acoustic transducer includes a magnetic circuit part and a voice coil operatively connected to the magnetic circuit part. A tubular casing accommodates the magnetic circuit part and the voice coil. An annular first support spring has an outer peripheral portion embedded and secured in the casing. The first support spring extends radially inward from the inner peripheral surface of the casing and has an inner peripheral portion abutting on and fixed to the magnetic circuit part. An annular second support spring has an outer peripheral portion abutting on and fixed to one end portion of the casing. The second support spring extends radially inward and has an inner peripheral portion abutting on and fixed to the magnetic circuit part.

Abstract: A multifunction speaker has a frame made of an insulation material and having a cylindrical portion, a pair of supporting springs secured to the frame and to a magnetic circuit for supporting the magnetic circuit. The magnetic circuit comprises a pole piece having a center pole and a flange on which an annular magnet is mounted. The flange of the pole piece has a pair of positioning projections projected from a periphery of the flange for positioning the magnet.

Abstract: A multifunction speaker comprises a frame made of an insulation material and having a terminal supporting portion, a pair of supporting springs are partly embedded in the frame. A magnetic circuit is resiliently supported in the frame by the springs, a diaphragm is secured to the frame, a coil is secured to the diaphragm, an upper metal protector and a lower metal protector are set on the frame. The upper and lower protectors are secured to each other so as to shield the frame except the terminal supporting portion of the frame, a pair of terminals are provided on the terminal supporting portion, each of the terminals is connected to an end of the coil, and a ground terminal is provided on the terminal supporting portion and is connected to either of the upper and lower protectors.

Abstract: A speaker collective substrate with component insertion hole sections and electrode sections has a plurality of speaker forming areas. An electrical speaker section, which comprises a magnetic circuit section and a vibration section, is inserted into each of the component insertion hole sections. Then, a collective lid, in which a plurality of lids have been formed for sealing the electrical speaker sections, is attached onto the speaker collective substrate. After that, the speaker collective substrate and the collective lid are divided into individual speaker forming areas along partition lines extending in the directions of the X and Y axes to form individual dynamic speakers. Thus, it is possible to mass-produce dynamic speakers with uniform quality through a collectively manufacturing process.

Abstract: An acoustic transducer includes a magnetic circuit part and a voice coil operatively connected to the magnetic circuit part. A tubular casing accommodates the magnetic circuit part and the voice coil. An annular first support spring has an outer peripheral portion embedded and secured in the casing. The first support spring extends radially inward from the inner peripheral surface of the casing and has an inner peripheral portion abutting on and fixed to the magnetic circuit part. An annular second support spring has an outer peripheral portion abutting on and fixed to one end portion of the casing. The second support spring extends radially inward and has an inner peripheral portion abutting on and fixed to the magnetic circuit part.

Abstract: A vibrating device has an axially elongated frame, and a vibrating assembly including a hollow yoke. A magnetic driving device is provided for axially vibrating the vibrating assembly. A supporting shaft is provided for axially slidably supporting the vibrating assembly in the frame.

Abstract: A multifunction speaker has a frame made of an insulation material and having a cylindrical portion, a pair of supporting springs secured to the frame and to a magnetic circuit for supporting the magnetic circuit. The magnetic circuit comprises a pole piece having a center pole and a flange on which an annular magnet is mounted. The flange of the pole piece has a pair of positioning projections projected from a periphery of the flange for positioning the magnet.

Abstract: A multifunction speaker comprises a frame made of an insulation material and having a terminal supporting portion, a pair of supporting springs are partly embedded in the frame. A magnetic circuit is resiliently supported in the frame by the springs, a diaphragm is secured to the frame, a coil is secured to the diaphragm, an upper metal protector and a lower metal protector are set on the frame. The upper and lower protectors are secured to each other so as to shield the frame except the terminal supporting portion of the frame, a pair of terminals are provided on the terminal supporting portion, each of the terminals is connected to an end of the coil, and a ground terminal is provided on the terminal supporting portion and is connected to either of the upper and lower protectors.

Abstract: A speaker collective substrate with component insertion hole sections and electrode sections has a plurality of speaker forming areas. An electrical speaker section, which comprises a magnetic circuit section and a vibration section, is inserted into each of the component insertion hole sections. Then, a collective lid, in which a plurality of lids have been formed for sealing the electrical speaker sections, is attached onto the speaker collective substrate. After that, the speaker collective substrate and the collective lid are divided into individual speaker forming areas along partition lines extending in the directions of the X and Y axes to form individual dynamic speakers. Thus, it is possible to mass-produce dynamic speakers with uniform quality through a collectively manufacturing process.

Abstract: A connecting spring plate has a first end connecting portion to be connected to a terminal of a sound generator and a second end connecting portion to be connected to a circuit for operating the sound generator. The surface of the first end connecting portion is coated with gold or with a solder, and the surface of the second end connecting portion is coated with gold.

Abstract: A speaker has a case having a peripheral projection, a yoke made of magnetic material and secured to the case, and a permanent magnet provided in the case. A vibrating plate having a peripheral projection is secured to an outside wall of the case at the peripheral projection. A protector plate is secured to the case.

Abstract: A loudspeaker has first and second diaphragms provided in a case. A first voice coil is provided for vibrating the first diaphragm, and a second voice coil is provided for vibrating the second diaphragm. A first permanent magnet is provided for applying a magnetic flux to the first voice coil, and a second permanent magnet is provided for applying a magnetic flux to the second voice coil.

Abstract: A cup-shaped yoke is axially movably provided in a cylindrical frame, and a cylindrical permanent magnet is securely provided in the yoke. A coil bobbin is cantilevered in the frame and inserted in a space between the yoke and the permanent magnet, and a driving coil is mounted on the coil bobbin. The yoke is held by a pair of coil springs for resiliently holding the yoke in the frame.

Abstract: A case comprises an upper case and a lower case. A vibrating plate is secured to the upper case, a voice coil is secured to an underside of the vibrating plate. Each end portion of the voice coil is engaged in a groove formed in the upper case.

Abstract: A yoke, a permanent magnet, and a top plate are stacked on a frame in order, and adhered with each other. The frame has a positioning protuberance projected from the frame, and each of the yoke, permanent magnet, and top plate has a central hole and is engaged with the positioning protuberance at the central hole.

Abstract: A cup-shaped yoke is axially movably provided in a cylindrical frame, and a cylindrical permanent magnet is securely provided in the yoke. A coil bobbin is cantilevered in the frame and inserted in a space between the yoke and the permanent magnet, and a driving coil is mounted on the coil bobbin. The yoke is held by a pair of coil springs for resiliently holding the yoke in the frame.

Abstract: A vibrating device has an axially elongated frame, and a vibrating assembly including a hollow yoke. A magnetic driving device is provided for axially vibrating the vibrating assembly. A supporting shaft is provided for axially slidably supporting the vibrating assembly in the frame.

Abstract: A loudspeaker has first and second diaphragms provided in a case. A first voice coil is provided for vibrating the first diaphragm, and a second voice coil is provided for vibrating the second diaphragm. A first permanent magnet is provided for applying a magnetic flux to the first voice coil, and a second permanent magnet is provided for applying a magnetic flux to the second voice coil.

Abstract: A microspeaker has a case, a vibrating plate, a voice coil secured to the vibrating plate. A pair of leads are embedded in one of members made of plastic. Both end portions of each of the leads are projected from the case. Each of both ends of the voice coil is secured to one of the projected end portions of each of the leads. Both the projected end portions of each of the leads are bent along a periphery of the case.

Abstract: A speaker has a case having a peripheral projection, a yoke made of magnetic material and secured to the case, and a permanent magnet provided in the case. A vibrating plate having a peripheral projection is secured to an outside wall of the case at the peripheral projection. A protector plate is secured to the case.