Uchihashi Estec Co., Ltd.

Toshiro Kawanishi

In the thermosensor of the invention, both endsof an elastic memberare fixed to a bodyin a state where the elastic memberis compressed in a longitudinal direction, to form the elastic memberinto a convex curved shape, one end side of the convex curved shape is raised by a predetermined angle &#x3b8;L' with respect to the body, a flexure angle of another endof the convex curved shape is zero, the fixation of one end portionof the elastic memberand the bodyis conducted via a fusible material, and a melting point or a softening point of the fusible materialis an operating temperature.

Thermosensor, thermoprotector, and method of producing a thermosensor

In the thermoprotector of the invention, an elastic movable conductoris placed between stationary electrodesopposed in an insulation housingOne end of the elastic movable conductoris fixed to one stationary electrodeThe elastic movable conductoris compressed in a longitudinal direction and elastically curved to cause a middle of the elastic movable conductorto be contacted with the other stationary electrodeAnother end portion of the elastic movable conductoris face joined by a fusible materialto the one stationary electrodeagainst a reaction force of the longitudinal direction compression. An insulation spaceris disposed in the insulation housingThe insulation spacer forms a space for housing the other end portion of the elastic movable conductorwhen the elastic movable conductoris elastically released by melting of the fusible material

Thermoprotector

A thin type thermal fuse is structured by a resin base film, a pair of belt-shaped lead conductors, a low melting-point fusible alloy piece, flux and a resin cover film. Tip portions of the pair of belt-shaped lead conductors is fixed on the resin base film. The low melting-point fusible alloy piece is coupled between the tip end portions of the belt-shaped lead conductors. The flux applied on the low melting-point fusible alloy piece. The resin cover film which is disposed on a one surface of the resin base film so that a space between said films at peripheries of both the resin cover film and the resin base film is sealed and a space between the resin cover film and the belt-shaped lead conductors is sealed. In the thin type thermal fuse, a relation of (V/L).sup.1/2 /d.ltoreq.1.8 is satisfied, where a distance between the tip portions of the belt-shaped lead conductors is set to be L, a volume of the low melting-point fusible alloy piece is set to be V and a distance between the front surface of the resin base film and an inner surface of the resin cover film is set to be d.

Thin type thermal fuse and manufacturing method thereof

A thin type fuse of the present invention has a structure in which each tip portion of a pair of lead conductors is put out from one side of an insulating substrate film on to the other side thereof so as to keep watertightness, the tip portions of the lead conductors on the other side of the insulating substrate film are connected by a fuse element, and the other side of the insulating substrate film is covered with an insulating covering film which is in contact with the fuse element. The contact of the fuse element with the insulating covering film is surface contact and a flux is filled around said contact surface.

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Osaka, Japan

Toshiro Kawanishi