Abstract: A sealing device includes: an annular seal that is disposed on an outer periphery of a rod of a hydraulic cylinder further on a side of an extending direction than a cylinder head of the hydraulic cylinder and that has a pair of opposing first facing surfaces; a holding member disposed on an outer periphery of the seal; and a fixing member disposed on an outer periphery of the holding member, the fixing member having a tapered inner surface that contacts an outer surface of the holding member and that has an inner diameter increasing toward a retracting direction.

Abstract: A sealing device includes: an annular seal that is disposed on an outer periphery of a rod of a hydraulic cylinder further on a side of an extending direction than a cylinder head of the hydraulic cylinder and that has a pair of opposing first facing surfaces; a holding member disposed on an outer periphery of the seal; and a fixing member disposed on an outer periphery of the holding member, the fixing member having a tapered inner surface that contacts an outer surface of the holding member and that has an inner diameter increasing toward a retracting direction.

Abstract: A loudspeaker includes a frame, a magnetic circuit, a magnetic gap, a diaphragm, a voice coil, a connector portion, and a lead wire. The connector portion is provided at the frame, and includes a terminal. The lead wire connects between the terminal and the voice coil, and has a connection portion connected to the terminal. Then, a first holder that holds the lead wire is formed at the connector portion. The lead wire is held between the terminal and the first holder as being clamped.

Abstract: A loudspeaker includes a frame, a magnetic circuit, a magnetic gap, a diaphragm, a voice coil, a connector portion, and a lead wire. The connector portion is provided at the frame, and includes a terminal. The lead wire connects between the terminal and the voice coil, and has a connection portion connected to the terminal. Then, a first holder that holds the lead wire is formed at the connector portion. The lead wire is held between the terminal and the first holder as being clamped.

Abstract: A loudspeaker includes a diaphragm, a magnetic circuit, and a frame. The frame includes an outer peripheral part supporting the diaphragm, a center part supporting the magnetic circuit, and a connection part connecting the center part to the outer peripheral part. The outer peripheral part molded with resin includes an inner wall, an outer wall facing the inner wall, and a reinforcing rib provided between the inner wall and the outer wall.

Abstract: A magnetic circuit includes an upper plate, a magnet, a lower plate, and a center pole. The outer circumference of a frame is coupled with a diaphragm. One end of a voice coil is coupled with the diaphragm, and the other end is inserted into a magnetic gap formed between the upper plate and the center pole. The frame is provided with a through hole. An insertion part provided on the outer circumference of the upper plate is inserted into the through hole. The frame is coupled with the upper plate by bending the insertion part.

Abstract: A magnetic circuit includes an upper plate, a magnet, a lower plate, and a center pole. The outer circumference of a frame is coupled with a diaphragm. One end of a voice coil is coupled with the diaphragm, and the other end is inserted into a magnetic gap formed between the upper plate and the center pole. The frame is provided with a through hole. An insertion part provided on the outer circumference of the upper plate is inserted into the through hole. The frame is coupled with the upper plate by bending the insertion part.

Abstract: A loudspeaker includes a diaphragm, a magnetic circuit, and a frame. The frame includes an outer peripheral part supporting the diaphragm, a center part supporting the magnetic circuit, and a connection part connecting the center part to the outer peripheral part. The outer peripheral part molded with resin includes an inner wall, an outer wall facing the inner wall, and a reinforcing rib provided between the inner wall and the outer wall.

Abstract: A sealing system is provided which is intended to achieve an improvement in durability. A dust seal is composed of a first dust seal (100) and a second dust seal (200) which is arranged at a location nearer to an atmospheric air side than the first dust seal (100), wherein each of the first dust seal (100) and the second dust seal (200) has a seal lip formed so as to be slidable with respect to an outer peripheral surface of the shaft. The first dust seal (100) has seal lips (121, 122) made of urethane rubber, and the second dust seal (200) has only a single seal lip (221) which is made of a rubber higher in flexibility than urethane rubber, and which extends toward the atmospheric air side.

Abstract: A sealing system is provided which is intended to achieve an improvement in durability. A dust seal is composed of a first dust seal (100) and a second dust seal (200) which is arranged at a location nearer to an atmospheric air side than the first dust seal (100), wherein each of the first dust seal (100) and the second dust seal (200) has a seal lip formed so as to be slidable with respect to an outer peripheral surface of the shaft. The first dust seal (100) has seal lips (121, 122) made of urethane rubber, and the second dust seal (200) has only a single seal lip (221) which is made of a rubber higher in flexibility than urethane rubber, and which extends toward the atmospheric air side.

Abstract: A sealing system is provided which is intended to achieve an improvement in durability. A dust seal is composed of a first dust seal and a second dust seal which is arranged at a location nearer to an atmospheric air side than the first dust seal, wherein each of the first dust seal and the second dust seal has a seal lip formed so as to be slidable with respect to an outer peripheral surface of the shaft. The first dust seal has seal lips made of urethane rubber, and the second dust seal has only a single seal lip which is made of a rubber higher in flexibility than urethane rubber, and which extends toward the atmospheric air side.

Abstract: A manufacturing method of a paper making part for a loudspeaker has freedom of adjusting a characteristic and a sound quality, and has a higher productivity. Accordingly, a fibrillating step of a paper making material is achieved by an explosive crushing step. Alternatively, the step is achieved by a mixing step of a paper making material and a liquid, a material micro-fabricating step of applying a pressure to a mixed solution obtained by the mixing step so as to pass through an orifice and thereafter run into a device wall, and a paper making step including the micro-fabricated material.

Abstract: The production equipment of paper-made components for loudspeakers includes a mixing device, a fining device, a paper-making device, and a shape processing device. The mixing device mixes material of a paper-made component for a loudspeaker into liquid to generate mixed liquid. The fining device includes a pressure unit, an orifice, and an inner wall. The pressure unit applies pressure on the mixed liquid to cause the mixed liquid to pass through the orifice, and the mixed liquid collides against the inner wall to cause the fining device to generate fined material. The paper-making device paper-makes the fined material to generate a paper-made component. The shape processing device processes the shape of the paper-made component. This structure provides production equipment of the paper-made components for loudspeakers, which prepares material for paper-making in a short time and reduces producing time.

Abstract: There is provided a sealing system with improved durability. In a sealing system in which a dust seal includes a first dust seal 100 and a second dust seal 200 provided on an atmosphere side of the first dust seal 100 and each of the first dust seal 100 and the second dust seal 200 has (a) seal lip(s) for sliding on an outer peripheral face of the shaft, the seal lips 121 and 122 of the first dust seal 100 are made of polyurethane rubber and the seal lip 221 of the second dust seal 200 is made of rubber having higher flexibility than the polyurethane rubber and is only the seal lip 221 extending toward the atmosphere side.

Abstract: A manufacturing method of a paper making part for a loudspeaker has freedom of adjusting a characteristic and a sound quality, and has a higher productivity. Accordingly, a fibrillating step of a paper making material is achieved by an explosive crushing step. Alternatively, the step is achieved by a mixing step of a paper making material and a liquid, a material micro-fabricating step of applying a pressure to a mixed solution obtained by the mixing step so as to pass through an orifice and thereafter run into a device wall, and a paper making step including the micro-fabricated material.

Abstract: A loudspeaker of high sound quality is achieved by improving rigidity of a material used for a diaphragm, a dust cap and a sub-cone. The diaphragm, the dust cap and the sub-cone of the loudspeaker are made of a paper beaten with the material containing bamboo fibers obtained from a bamboo tree aged one year or older, of which the fibers are finely beaten to an extent of micro-fibrillated form. The diaphragm and the dust cap are also made with a beaten paper containing at least 2 wt % of “A fibers” having stems of no greater than 30 ?m in diameter, and surfaces of the stems are fibrillated into shaggy branches having diameters of 1 ?m or less.

Abstract: A manufacturing method of a paper making part for a loudspeaker has freedom of adjusting a characteristic and a sound quality, and has a higher productivity. Accordingly, a fibrillating step of a paper making material is achieved by an explosive crushing step. Alternatively, the step is achieved by a mixing step of a paper making material and a liquid, a material micro-fabricating step of applying a pressure to a mixed solution obtained by the mixing step so as to pass through an orifice and thereafter run into a device wall, and a paper making step including the micro-fabricated material.

Abstract: A sealing system is provided which is intended to achieve an improvement in durability. A dust seal is composed of a first dust seal (100) and a second dust seal (200) which is arranged at a location nearer to an atmospheric air side than the first dust seal (100), wherein each of the first dust seal (100) and the second dust seal (200) has a seal lip formed so as to be slidable with respect to an outer peripheral surface of the shaft. The first dust seal (100) has seal lips (121, 122) made of urethane rubber, and the second dust seal (200) has only a single seal lip (221) which is made of a rubber higher in flexibility than urethane rubber, and which extends toward the atmospheric air side.

Abstract: A manufacturing method of a paper making part for a loudspeaker has freedom of adjusting a characteristic and a sound quality, and has a higher productivity. Accordingly, a fibrillating step of a paper making material is achieved by an explosive crushing step. Alternatively, the step is achieved by a mixing step of a paper making material and a liquid, a material micro-fabricating step of applying a pressure to a mixed solution obtained by the mixing step so as to pass through an orifice and thereafter run into a device wall, and a paper making step including the micro-fabricated material.

Abstract: A loudspeaker of high sound quality is achieved by improving rigidity of a material used for a diaphragm, a dust cap and a sub-cone. The diaphragm, the dust cap and the sub-cone of the loudspeaker are made of a paper beaten with the material containing bamboo fibers obtained from a bamboo tree aged one year or older, of which the fibers are finely beaten to an extent of micro-fibrillated form. The diaphragm and the dust cap are also made with a beaten paper containing at least 2 wt % of “A fibers” having stems of no greater than 30 ?m in diameter, and surfaces of the stems are fibrillated into shaggy branches having diameters of 1 ?m or less.