Abstract: Disclosed is a litz wire coil that is configured by spirally winding a litz wire on one plane by a predetermined number of turns. The litz wire is configured by twisting together a plurality of enameled wires formed by baking an insulating film on a conducting body. Pressure shaping is performed such that the litz wire has a substantially rectangular shape in cross section, and the flatness ratio of the litz wire in cross section (long side/short side) is controlled at 1.10 to 1.60, preferably 1.20 to 1.40, more preferably 1.25 to 1.35.

Abstract: A terminal connecting method including: removing a insulation film by a predetermined length from one end of a litz wire; inserting to a pressure fixing part a terminal part of the litz wire; compressing a first portion of the pressure fixing part with a first compression force to cause plastic deformation of an entirety of the pressure fixing part, and to temporarily fix the terminal part of the litz wire to the pressure fixing part; compressing a second portion of the pressure fixing part with a second compression force greater than the first compression force to locally cause plastic deformation of the pressure fixing part and the litz wire, the second portion being a part of the first portion; and pouring molten solder from a front end side of the pressure fixing part to firmly fix the litz wire to the terminal metal fitting.

Abstract: A reticulate heater for a steering wheel exhibits flexibility, elasticity and waterproofness. The reticulate heater comprises a reticulate heat generating element (11) consisting of a plurality of insulated heater wires (14) braided in a mesh form, and exhibiting flexibility and elasticity to permit tight contact with a curved surface, a waterproof stretch-film (12) covering the front and rear surfaces of the reticulate heat generating element (11) water-tightly and adhering to the reticulate heat generating element (11) while still keeping the flexibility and elasticity thereof, and an elastic adhesive (13) having flexibility and elasticity even after curing, applied to the whole surface of the stretch-film (12) on the adhering surface side in a planar and thin state, and bonding the stretch-film (12) to the reticulate heat generating element (11) water-tightly even if the stretch-film (12) is stretched within an allowable tensile range.

Abstract: A sound absorbing material (1a) comprising a film (11) composed of a silicone rubber and a porous layer (12) (i.e., a first porous layer) laminated on the back surface of the film (11). The film (11) is made of a material which has flame retardancy and generates no noxious fume during combustion, such as a silicone rubber comprising only polysiloxane. The film (11) used is preferably one which has an oxygen index of 25 or higher, which exhibits a heat release value of combustion per unit volume of 8 MJ/m or less and which exhibits a heat release rate of combustion of [200 kW/m2]·10 sec or less. The first porous layer (12) is formed from a material having flame retardancy, such as glass wool, rock wool or a mixture thereof. A structure (3a) can be formed by providing the sound absorbing material (1a) having the construction described above on a rigid wall (2) in parallel, with the first porous layer (12) facing to the rigid wall (2).

Abstract: Even if a fiber fuse phenomenon occurs to start fire spreading, the fire spreading is shut off. A graded index fiber (GIF) 3 is inserted between transmission-use single mode fibers (SMF) 2a, 2b on a fiber optics transmission line 1. The GIF 3 is so designed that its mode field diameter (MFD) gradually increases from a light entry side. The MFD exhibits a maximum value at a location ¼ of a pitch from the end of the GIF 3. A GIF 3a is disposed on the light entry side. A GIF 3b having an MFD gradually decreasing is disposed on the opposite side of the GIF 3a. The GIF 3b is disposed on the light exit side. The lengths of the GIF 3a and GIF 3b are ¼ of a pitch. The length of the GIF 3 formed by connecting the both is ½ of a pitch. According to the present invention, an expanded MFD is inserted in the middle of the fiber optics transmission line, it is possible to shut off fire spreading caused due to fiber fuse phenomenon.