Eccentric rotor and vibrator motor incorporating the rotor

A compact vibrator motor comprising:

• a printed wiring commutator device where a hole for shaft installation is formed at the center thereof and a plurality of segment patterns are formed at the periphery of one surface thereof;
• a winding type armature coil configured in a non-mold manner by being wound around two magnetized salient poles, which become a winding type armature coil position determination guide, facing each other and by making an open angle of wiring of a blade receiving magnetic flux of a field magnet eccentric, at the other surface of said printed wiring commutator device;
• an eccentric rotor having an eccentricity accentuating non-magnetized salient pole simultaneously used as a resin holder and an eccentric weight made of sliding, high density resin exhibiting density of equal to or more than 3 and a mobile friction coefficient of equal to or less than 0.4 (1.5 kg/cm2), and arranged such that the thickness thereof is within a thickness in the axial direction of said winding type armature coil, by being inserted in the shaft installation hole, to maintain the magnetized salient poles, between two magnetized salient poles;
• a shaft supporting said eccentric rotor to be capable of rotating;
• and
• a housing accommodating said eccentric rotor and a magnet for applying magnetic force to said eccentric rotor.

An eccentric rotor comprising:

• a printed wiring commutator device formed to be eccentrically as an expanded fan viewed from a plane, in which a hold for shaft installation is formed at the center thereof and a plurality of segment patterns are formed at the periphery of one surface thereof;
• a winding type air-core armature coil incorporated in an air-core armature coil position determination guide in a non-mold manner, which protrudes and is formed to be eccentric at the other surface of said printed wiring commutator device;
• an end connection portion installed at such a position at the outer circumferential portion of said printed wiring commutator device that latching an end portion of said winding type armature coil is possible within a range of not deviating from the turning circumference during rotation and simultaneously electrical connection with the segment patterns is possible, and also at the position of not overlapping said winding type armature coil viewed from a plane;
• a resin bearing holder inserted in said shaft installation hole so that part thereof protrudes toward the segment pattern and simultaneously the other part thereof is extended toward the other surface of said printed wiring commutator device;
• and
• a resin eccentric weight exhibiting density of over 3 installed at a fan-like arc-shaped portion of said printed wiring commutator device.

An eccentric rotor comprising:

• an eccentric printed wiring commutator device formed as an expanded fan viewed from a plane, in which a hole for shaft installation is formed at the center thereof, a plurality of segment pieces are exposed toward the periphery of one surface thereof, at least one armature coil is formed in a printed wiring manner at at least one surface, a winding type armature coil installation guide is eccentrically incorporated, and an end connection portion for each coil is arranged in the turning outer circumference during rotation;
• a winding type air-core coil incorporated in said air-core position determination guide in a non-mold manner and the end portion is connected to said end connection portion;
• a resin bearing holder inserted in said shaft installation hole so that part thereof protrudes toward the segment pattern and simultaneously the other part thereof is extended toward the other surface of said printed wiring commutator device;
• and
• a resin eccentric weight exhibiting density of over 3 installed at a fan-like arc-shaped portion of said printed wiring commutator device.

A method of manufacturing an eccentric rotor comprising the steps of:

• (a) forming a hold for shaft installation at the center thereof and at least a plurality of segment patterns at the periphery of one surface thereof, installing an end connection portion at the outer circumference thereof, and installing a plurality of printed wiring commutator devices where a resin passing portion is formed through a connection portion arranged at the outer circumference thereof;
• (b) integrally forming a resin bearing holder with resin exhibiting a sliding property and a mobile friction coefficient of equal to or less than 0.4 (1.5 kg/cm2) by setting said printed wiring commutator device to an injection mold;
• (c) integrally installing a winding type armature coil to be eccentric by separating from each connection portion or as it is, in a non-mold manner;
• and
• (d) configuring an eccentric rotor by connecting an end portion of said winding type armature coil to said end connection portion.