Patent ID: 7592799

Claim:
A magnetic encoder comprising: a multipolar magnet having magnetic poles formed therein, the magnetic poles alternating with each other in a direction circumferentially thereof; a core metal supporting the multipolar magnet; wherein the multipolar magnet is prepared from a sintered element formed by sintering a powdery mixture of a magnetic powder and a non-magnetic metallic powder and is fixed to the core metal by staking the core metal to form a unitary component made up of the sintered element and the core metal; wherein the unitary component is subjected to a surface treatment for anticorrosion, the surface treatment is an electrodeposition, and at least one of a surface of the sintered element and a surface of the core metal which contacts that surface of the sintered element is provided with a groove for penetration of an electrodepositing paint so that the paint acts as a bonding agent between the sintered element and the core metal.