Abstract: A method of producing a loudspeaker vibrating diaphragm comprising the steps of injecting an amount of resin containing a foaming agent into a metallic mold of an injection molding machine, the mold including a fixed part and a movable part, reducing a mold pressing force of the injection molding machine upon completion of the resin injection, so as to enlarge a space formed between the fixed part and the movable part by a predetermined distance, so that the foaming agent is foamed to obtain a foam layer in the diaphgram.

Abstract: There is provided a speaker damper comprising: an inner frame for inserting and holding a voice coil bobbin; an outer frame to be fixed on to a speaker frame in a speaker unit; a plurality of flexibly movable supporting arms bridged across a space between the inner frame and the outer frame; a plurality of reinforcing members each bridged across a space between two flexibly movable supporting arms adjacent to the inner frame.

Abstract: A speaker unit has a cylindrical yoke, an annular frame secured to the yoke, and a diaphragm having a central spherical vibrating portion and an annular support portion formed around the vibrating portion and mounted on the annular frame. An annular vertical holding wall is formed on the annular frame, and an annular vertical abutment portion is formed on the annular support portion and abutted against the annular vertical holding wall.

Abstract: An organic electro-luminescent element is provided with a drying substance contained in an airtight container and spaced from the element in an internal space of the airtight container for absorbing moisture in the internal space. The drying substance comprises a solid compound which chemically absorbs the moisture and maintains its solid state even after absorbing the moisture.

Abstract: A loudspeaker having a magnetizable pole piece, a voice coil member surrounding the pole piece with a portion of magnetic gap and connected to a vibratable diaphragm, and a damper supporting the voice coil member, is characterized in that an elastic member is provided between the pole piece and the voice coil member in the magnetic gap wherein an elastic member is made of an elastic material having an elastic constant substantially 1.5 times or more than that of the damper. In addition, the elastic material is made of a silicone rubber.

Abstract: A loudspeaker vibrating diaphragm with has a foam layer and two un-foamed skin layers formed on both sides of the foam layer. The average foaming magnification including the foam layer and two un-foamed skin layers is 1.1-3.0. The average foaming magnification is the ratio of the thickness of the resin after foaming (which equals the sum of the thicknesses of the foamed layer and the two un-foamed layers) to the thickness of the resin before foaming. The foam layer contains foaming bubble cells which are formed with their longer axes arranged in the thickness direction of the diaphragm. The thickness of each un-foamed skin layer is 0.05-0.20 mm.

Abstract: A butterfly damper for preventing an adhesion surface between a speaker frame (6) and an outer peripheral frame (12) from peeling off is provided. The butterfly damper comprises an inside peripheral flame (11), an outer peripheral flame (12) and a plurality of movable arms (13), all of which are formed in a single piece by injection molding of thermoplastic synthetic resin. The thickness T of the outer peripheral flame (12) is thicker than the thickness t of the movable arms (13). In addition, the front and back faces of the outer peripheral flame (12) are formed so that each face protrudes toward the thickness direction respectively from the front face and the back face of the movable arms (13).

Abstract: There is provided a loading/ejecting mechanism which comprises a moving mechanism for engaging with a cassette and for moving the cassette between an inserting position and a reproducing position. A sliding member is capable of applying a driving force to the moving mechanism so as to cause the moving mechanism to move between the inserting position and the reproducing position. A first gear is driven by a motor and provided such that in a cassette loading operation, the first gear engages with the sliding member thereby causing the sliding member to move in the loading direction. A second gear is driven by the first gear and provided such that in a cassette ejecting operation, the second gear rotates in an opposite direction to the first gear.

Abstract: A diaphragm used for a loudspeaker comprises polybutylene-terephthalate-polyester-elastomer. It has a flat audio spectrum property and excellent in internal loss, heat-resistance, light-resistance and water-resistance.

Abstract: An optical wavelength converter includes an optical wavelength converting element having a multimode waveguide of a core of a nonlinear optical material with a high temperature dependency or temperature coefficient of an index difference for the fundamental wave and secondary harmonic and a clad surrounding the multimode waveguide for converting a wavelength of a fundamental wave entering the multimode waveguide to a 1/2 wavelength of a secondary harmonic; and a temperature tuning device for changing a temperature of the clad and the multimode waveguide within a predetermined temperature range to maintain a phase matching temperature of the fundamental wave and the secondary harmonic in the optical wavelength converting element. The temperature tuner changes the temperature coefficient so as to select a pertinent pair of the fundamental wave and secondary harmonic modes for a wavelength conversion.

Abstract: An optical wavelength converting device comprises; a semiconductor laser emitting a fundamental wave; a waveguide-type optical wavelength converting element having a core made of a nonlinear optical material and a clad surrounding the core; and a converging optical system for converging the fundamental wave onto an input end of the waveguide, characterized in that the device further comprises; an adjusting optical system for adjusting a quantity of backward light backed from the optical wavelength converting element to the semiconductor disposed in the coupling optical system; a reflecting portion for reflecting the fundamental wave disposed in the an optical wavelength converting element or the coupling optical system; a current controller for changing an electric current to be supplied to the semiconductor laser; and an optical-path-length stabilizing device comprising a supporting plate for supporting the semiconductor laser, the coupling optical system and the an optical wavelength converting element to k

Abstract: A mode control ring having cams for operating various devices in a cassette tape recorder is rotatably mounted on a base plate. A normal pinch device and a reverse pinch device are mounted on the base plate. Each of the pinch devices comprises a capstan, a pinch roller provided on a swing lever so as to be engaged with the capstan, and an idler provided to be engaged with a reel gear. A power transmitting devices is provided for transmitting a driving power from a motor to each capstan. The normal pinch device, reverse pinch device are disposed along the circumference of the mode control ring, and each swing lever is arranged so as to be moved in the radial direction of the mode control ring. Selective operation of these devices is controlled by the rotatably mounted mode control ring, which has various cams formed on its inner peripheral surface, on its outer surface, and as grooves therein, which are engaged with cam following members of the devices.

Abstract: A multiple amplifier system comprises a sound source, a power source, an electronic crossover network for dividing an audio signal from the sound source into a plurality of frequency ranges. Each of the divided audio signal is amplified by an individual power amplifier and fed to a corresponding speaker. A superposing circuit is connected to the sound source and the power source for superposing the audio signal from the sound source and power from the power source. The superposed signal is applied to the electronic crossover network through a lead.

Abstract: An EL display panel comprises a plurality of insulating substrates which are aligned side by side. Each substrate has an elongated first side surface and an opposite second side surface, a plurality of discrete electrodes formed on the first side surface, a common electrode formed on the second side surface, and a plurality of luminescent elements formed on a top surface of the substrate. The discrete electrodes of the adjacent substrates are electrically connected with each other.

Abstract: An insulator substrate is held by a supporting member in an upright position. A plurality of heating members are formed on a top face of the substrate. A plurality of individual conductive patterns and a common electrode are provided on the substrate to be connected to the heating members so as to supply a current to each heating member.