Patent ID: 8405255
Filing Date: 2013-03-26
Classification: H02K

Abstract:
1. An electric power generating apparatus, comprising: a casing that is made of a nonmagnetic material and has an outer surface and an interior space; a guide shaft that is made of a nonmagnetic material and provided in the interior space while being supported by the casing; a permanent magnet provided to the guide shaft so that the permanent magnet is capable of being reciprocated; a coil provided on an outer circumference of the interior space; a shield case to cover the outer surface of the casing, the shield case being made of a magnetic material; and an electric circuit unit to output an electric energy generated in the coil by reciprocating the permanent magnet; wherein the permanent magnet has a hollow cylindrical tube shape and includes two permanent magnets, wherein the two permanent magnets are held by a holding member, wherein the holding member includes an intermediate member and a cap member, wherein the intermediate member includes a tube portion and a flange portion, the tube portion having, on an inner circumferential portion thereof, a hole through which the guide shaft is inserted and having, on an outer circumferential portion thereof, an outer circumferential surface on which the permanent magnet is provided, the flange portion being protruded from a middle portion in a longitudinal direction of the outer circumferential surface, wherein the cap member includes a tube portion and a guard portion, the tube portion being provided through both ends of the intermediate member in a longitudinal direction and having a hole through which the guide shaft is inserted, the guard portion being protruded from the tube portion and holding the permanent magnet provided on the outer circumferential surface, and wherein at least one of the hole of the intermediate member and the hole of the cap member is slidably connected to the guide shaft.