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| Number | Title | Issue Date |
| 4321434 | Electroacoustic transducer An electroacoustic transducer having a diaphragm apparatus. The diaphragm apparatus has an annular diaphragm and a pair of outer and inner edges respectively conjoining with the outside and the inside of the diaphragm. Both edges have sets of pleats arran... | 03/23/1982 |
| 4312258 | Battery powered electronic guitar An improved speaker mounting for an electronic guitar is provided. The mounting includes a rubber cup extending into the interior of the guitar from a cut out in the top board surface of the guitar. The cup has a flanged rim extending about the opening an... | 01/26/1982 |
| 4302634 | Spring force biasing means for a capacitance-type electrostatic transducer Conformity between a cooperatively engaged vibratile diaphragm and backplate of a capacitance-type electrostatic transducer assembly is improved, and unwanted mechanical vibrations in said backplate are substantially reduced, by means of a low cost, easil... | 11/24/1981 |
| 4284167 | Sound reproducing device An improved sound reproducing device which includes a housing, an acoustic diaphragm and drive means for driving the acoustic diaphragm. Corrugated compliant coupling means is provided for supporting the acoustic diaphragm with respect to the housing in a... | 08/18/1981 |
| 4257325 | Mouting of a substantially planar diaphragm defining a sound transducer Mounting of a substantially planar diaphragm defining a sound transducer, having a central portion surrounded by stepwise interconnected outer plates to assure correctly guided vibratory movement of the central portion. Recesses in the central portion ope... | 03/24/1981 |
| 4239090 | High accuracy bass reproducer device The present invention is directed to an apparatus for reproducing the bass components of an audio signal with a high degree of accuracy and minimal distortion, utilizing an enclosure of relatively small size. The apparatus comprises a substantially sealed... | 12/16/1980 |
| 4235302 | Loudspeaker In a loudspeaker, the diaphragm is connected to the edge member fixedly secured to the frame through an intermediate supporting means, at least one part of the intermediate supporting means is made of a material having a low hysteresis characteristic. Acc... | 11/25/1980 |
| 4206832 | Drone acoustical transducer A drone acoustical transducer for a loudspeaker system has an improved means of interconnecting the generally conical speaker diaphragm and supporting basket. In conventional fashion, the acoustical transducer includes a generally conical speaker diaphrag... | 06/10/1980 |
| 4190746 | Diaphragm material for moving coil loudspeaker, may be laminated or integral with surround A diaphragm for a moving evil loudspeaker is formed of a material which has a mechanical "0"value of from 7 to 12, a Youngs modulus of from 8.5 to 17.5 × 105 KN/M2 and a density of from 0.85 to 1.05 g/cc. The diaphragm forming mate... | 02/26/1980 |
| 4122314 | Loudspeaker having a laminate diaphragm of three layers A loudspeaker having a diaphragm including first and second layers and a core sandwiched between the layers, the core being firmly secured to the inner surface of each layer so as to form a unitary structure therewith, a drive assembly causes the diaphrag... | 10/24/1978 |
| 3997023 | Loudspeaker with improved surround A loudspeaker comprises a frame, a cone assembly which includes a cone body having an outer periphery spaced away from the frame, and a flexible annular surround connecting the periphery of the cone body to the frame. The surround has an inner peripheral ... | 12/14/1976 |
| 3983337 | Broad-band acoustic speaker A very small audio speaker is described which has a broad-band electrical-mechanical transducer, a broad-band mechanical-air-transducer, and a special suspension system which combine to produce a substantially flat frequency response over substantially th... | 09/28/1976 |
| 3980841 | Speaker edge An acoustic material suitable for use as a speaker edge comprises an expanded plastic and minute collagen fibers wherein the content of the collagen fibers is 15 - 40% based on the weight of the expanded plastic and the length of the fibers is equal to or... | 09/14/1976 |
