Abstract: There is provided a diaphragm or a dust cap configured to emit a sound wave and an electrodynamic speaker unit including the diaphragm or the dust cap. The speaker unit is configured so that a great peak dip of sound pressure frequency characteristics due to influence of a divided vibration mode can be prevented and excellent reproduced sound quality can be provided. In the diaphragm or the dust cap, a recessed-raised portion imitating a wing of an insect is formed at least on one surface of a diaphragm portion configured to emit a sound wave. Preferably, the recessed-raised portion is formed based on data obtained by measurement of an actual shape of a wing vein of the insect or data of a Voronoi diagram imitating the wing vein of the insect.

Abstract: There is provided a diaphragm or a dust cap configured to emit a sound wave and an electrodynamic speaker unit including the diaphragm or the dust cap. The speaker unit is configured so that a great peak dip of sound pressure frequency characteristics due to influence of a divided vibration mode can be prevented and excellent reproduced sound quality can be provided. In the diaphragm or the dust cap, a recessed-raised portion imitating a wing of an insect is formed at least on one surface of a diaphragm portion configured to emit a sound wave. Preferably, the recessed-raised portion is formed based on data obtained by measurement of an actual shape of a wing vein of the insect or data of a Voronoi diagram imitating the wing vein of the insect.

Abstract: An acoustic diaphragm which has excellent Young's modulus and internal loss (tan ?) values is provided. The acoustic diaphragm according to the present invention is made from papermaking material substantially solely including cellulose nanofibers. In one embodiment, the cellulose nanofibers are unoxidized cellulose nanofibers.

Abstract: An acoustic diaphragm which has excellent Young's modulus and internal loss (tan ?) values is provided. The acoustic diaphragm according to the present invention is made from papermaking material substantially solely including cellulose nanofibers. In one embodiment, the cellulose nanofibers are unoxidized cellulose nanofibers.

Abstract: A speaker diaphragm in which the Young's modulus, internal loss (tan ?), airtightness, and various strengths are well balanced is provided. The speaker diaphragm according to the present invention includes wood pulp and cellulose nanofibers, wherein, in one embodiment, the cellulose nanofibers are unoxidized cellulose nanofibers. The content rate of the cellulose nanofibers is one part by weight to 20 parts by weight with respect to 100 parts by weight of the wood pulp, for example.

Abstract: The present invention provides a loudspeaker diaphragm and an electrodynamic loudspeaker of an elongated shape being shorter in the minor-axis direction than in the major-axis direction, which have a desirable sound reproducing capability with a high efficiency and are not significantly influenced by divided vibrations of an elongated loudspeaker diaphragm, and which are suitably installed in devices such as display devices.

Abstract: According to the invention, a whole-surface driven, flat thin loudspeaker that brings about smooth frequency characteristics with split vibration hardly caused is realized, and a voice coil assembly that has high reproduction efficiency and fewer operation failures, and brings about favorable work efficiency in manufacturing and further reduced manufacturing cost, and a loudspeaker using the same are manufactured.

Abstract: A voice coil assembly capable of realizing a flat thin loudspeaker having a high efficiency, reduced divided vibrations, a flat frequency response, and reduced operation defects. The voice coil assembly includes a plurality of internal-winding voice coils, each including a rectangular bobbin having a rectangular cross section and defining a rectangular space therein and an internal rectangular coil fixed to an inner wall surface of the rectangular bobbin defining the rectangular space, wherein an outer wall surface of the rectangular bobbin of one internal-winding voice coil is adhered and fixed to an outer wall surface of the rectangular bobbin of another internal-winding voice coil.

Abstract: According to the invention, a whole-surface driven, flat thin loudspeaker that brings about smooth frequency characteristics with split vibration hardly caused is realized, and a voice coil assembly that has high reproduction efficiency and fewer operation failures, and brings about favorable work efficiency in manufacturing and further reduced manufacturing cost, and a loudspeaker using the same are manufactured.

Abstract: A voice coil assembly capable of realizing a flat thin loudspeaker having a high efficiency, reduced divided vibrations, a flat frequency response, and reduced operation defects. The voice coil assembly includes a plurality of internal-winding voice coils, each including a rectangular bobbin having a rectangular cross section and defining a rectangular space therein and an internal rectangular coil fixed to an inner wall surface of the rectangular bobbin defining the rectangular space, wherein an outer wall surface of the rectangular bobbin of one internal-winding voice coil is adhered and fixed to an outer wall surface of the rectangular bobbin of another internal-winding voice coil.

Abstract: The present invention provides a loudspeaker diaphragm and an electrodynamic loudspeaker of an elongated shape being shorter in the minor-axis direction than in the major-axis direction, which have a desirable sound reproducing capability with a high efficiency and are not significantly influenced by divided vibrations of an elongated loudspeaker diaphragm, and which are suitably installed in devices such as display devices.

Abstract: A speaker diaphragm includes a base material impregnated with a thermosetting resin composition. The base material includes a first surface material, a core material, and a second surface material in the stated order; the first surface material and the second surface material are each formed of a woven fabric or a non-woven fabric; and the core material is formed of a woven fabric or a non-woven fabric each including hollow fine particles.

Abstract: A speaker diaphragm includes a base material impregnated with a thermosetting resin composition. The base material includes a first surface material, a core material, and a second surface material in the stated order; the first surface material and the second surface material are each formed of a woven fabric or a non-woven fabric; and the core material is formed of a woven fabric or a non-woven fabric each including hollow fine particles.

Abstract: The speaker member of the present invention comprises (a) a vibrating plate part comprising a base material, a part of the base material being impregnated with a thermosetting resin; and (b) an edge part containing the same base material as that of the vibrating plate. Such a speaker member is obtained by a method comprising the steps of: forming a base material; impregnating a portion of the base material with a thermosetting resin wherein the portion is to be a vibrating plate part; and curing said impregnated thermosetting resin so as to form the vibrating plate part, and simultaneously forming an edge part.