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A magnetic micro-encoder1has a magnetic disk4polarized in an axial direction, a first back yoke5mounted on the magnetic disk4, two magnetic sensors6arranged opposite to a surface of the magnetic disk4in an axial direction with a gap therebetween and being mounting on sensor mounting part of a flexib

A magnetic micro-encoder1has a magnetic disk4polarized in an axial direction, a first back yoke5mounted on the magnetic disk4, two magnetic sensors6arranged opposite to a surface of the magnetic disk4in an axial direction with a gap therebetween and being mounting on sensor mounting part of a flexible printed substrate7in such a manner that longitudinal direction of these magnetic sensors are substantially parallel to a band-formed wiring part of the flexible printed substrate7, a second back yoke8mounted on a back of the magnetic sensors6with the flexible printed substrate7intervened therebetween and forming a magnetic circuit with the e first back yoke5and the magnetic disk4, and a housing3for accmmodating the first back yoke5, the magnetic disk4, the magnetic sensors6, and the second back yoke8.

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1. A magnetic micro-encoder, comprising: a magnetic disk mounted on a rotation shaft and polarized in an axial direction; a first back yoke mounted on said magnetic disk; two magnetic sensors arranged opposite to a surface of said magnetic disk in an axial direction with a gap therebetween,

1. A magnetic micro-encoder, comprising: a magnetic disk mounted on a rotation shaft and polarized in an axial direction; a first back yoke mounted on said magnetic disk; two magnetic sensors arranged opposite to a surface of said magnetic disk in an axial direction with a gap therebetween, said magnetic sensors being mounted on a sensor mounting part of a flexible printed substrate in such a manner that longitudinal directions of said magnetic sensors are substantially parallel to a band-formed wiring part of the flexible printed substrate; a second back yoke mounted on a back of said magnetic sensors with the flexible printed substrate intervened therebetween, said second back yoke forming a magnetic circuit with said first back yoke and said magnetic disk; and a housing for accommodating said first back yoke, said magnetic sensors, and said second back yoke. 2. A magnetic micro-encoder, comprising: a magnetic disk mounted on a rotation shaft and polarized in an axial direction; a first back yoke mounted on said magnetic disk; two magnetic sensors arranged opposite to a surface of said magnetic disk in an axial direction with a gap therebetween, said magnetic sensors being mounted on a sensor mounting part of a flexible printed substrate in such a manner that longitudinal directions of said magnetic sensors are substantially parallel to a band-formed wiring part of the flexible printed substrate; a second back yoke mounted on a back of said magnetic sensors with the flexible printed substrate intervened therebetween, said second back yoke forming a magnetic circuit with said first back yoke and said magnetic disk; and a housing for accommodating said first back yoke, said magnetic sensors, and said second back yoke, wherein a number of magnetic poles of said magnetic disk is defined as 2 (1+4n) (where “n” is an integer of 0(zero) or more), and said two magnetic sensors are arranged in such a manner that their positions are open to each other in an angle of 90 degrees from the rotation shaft. 3. A magnetic micro-encoder, comprising: a magnetic disk mounted on a rotation shaft and polarized in an axial direction; a first back yoke mounted on said magnetic disk; two magnetic sensors arranged opposite to a surface of said magnetic disk in an axial direction with a gap therebetween, said magnetic sensors being mounted on a sensor mounting part of a flexible printed substrate in such a manner that longitudinal directions of said magnetic sensors are substantially parallel to a band-formed wiring part of the flexible printed substrate; a second back yoke mounted on a back of said magnetic sensors with the flexible printed substrate intervened therebetween, said second back yoke forming a magnetic circuit with said first back yoke and said magnetic disk; and a housing for accommodating said first back yoke, said magnetic sensors, and said second back yoke, wherein a number of magnetic poles of said magnetic disk is defined as 2 (3+4n) (where “n” is an integer of 0(zero) or more), and said two magnetic sensors are arranged in such a manner that their positions are open to each other in an angle of 90 degrees from the rotation shaft. 4. A magnetic micro-encoder, comprising: a magnetic disk mounted on a rotation shaft and polarized in an axial direction; a first back yoke mounted on said magnetic disk; two magnetic sensors arranged opposite to a surface of said magnetic disk in an axial direction with a gap therebetween, said magnetic sensors being mounted on a sensor mounting part of a flexible printed substrate in such a manner that longitudinal directions of said magnetic sensors are substantially parallel to a band-formed wiring part of the flexible printed substrate; a second back yoke mounted on a back of:said magnetic sensors with the flexible printed substrate intervened therebetween, said second back yoke forming a magnetic circuit with said first back yoke and said magnetic disk; and a housing for accommodating said first back yoke, said magnetic sensors, and said second back yoke, wherein said housing is structured in such a manner that a cut-out portion is formed on said housing for drawing out the band-formed wiring part therethrough, the sensor mounting part is formed along a shape of the cut-out portion, and the flexible printed substrate is engaged with said housing to be fixed therein. 5. A magnetic micro-encoder, comprising: a magnetic disk mounted on a rotation shaft and polarized in an axial direction; a first back yoke mounted on said magnetic disk; two magnetic sensors arranged opposite to a surface of said magnetic disk in an axial direction with a gap therebetween, said magnetic sensors being mounted on a sensor mounting part of a flexible printed substrate in such a manner that longitudinal directions of said magnetic sensors are substantially parallel to a band-formed wiring part of the flexible printed substrate; a second back yoke mounted on a back of said magnetic sensors with the flexible printed substrate intervened therebetween, said second back yoke forming a magnetic circuit with said first back yoke and said magnetic disk; and a housing for accommodating said first back yoke, said magnetic sensors, and said second back yoke, wherein a number of magnetic poles of said magnetic disk is defined as 2 (1+4n) (where “n” is an integer of 0(zero) or more), said two magnetic sensors are arranged in such a manner that their positions are open to each other in an angle of 90 degrees from the rotation shaft, and said housing is structured in such a manner that a cut-out portion is formed on said housing for drawing out the band-formed wiring part therethrough, the sensor mounting part is formed along a shape of the cut-out portion, and the flexible printed substrate is engaged with said housing to be fixed therein. 6. A magnetic micro-encoder, comprising: a magnetic disk mounted on a rotation shaft and polarized in an axial direction; a first back yoke mounted on said magnetic disk; two magnetic sensors arranged opposite to a surface of said magnetic disk in an axial direction with a gap therebetween, said magnetic sensors being mounted on a sensor mounting part of a flexible printed substrate in such a manner that longitudinal directions of said magnetic sensors are substantially parallel to a band-formed wiring part of the flexible printed substrate; a second back yoke mounted on a back of said magnetic sensors with the flexible printed substrate intervened therebetween, said second back yoke forming a magnetic circuit with said first back yoke and said magnetic disk; and a housing for accommodating said first back yoke, said magnetic sensors, and said second back yoke, wherein a number of magnetic poles of said magnetic disk is defined as 2 (3+4n) (where “n” is an integer of 0(zero) or more), said two magnetic sensors are arranged in such a manner that their positions are open to each other in an angle of 90 degrees from the rotation shaft, and said housing is structured in such a manner that a cut-out portion is formed on said housing for drawing out the band-formed wiring part therethrough, the sensor mounting part is formed along a shape of the cut-out portion, and the flexible printed substrate is engaged with said housing to be fixed therein. 7. A magnetic micro-encoder, comprising: a magnetic disk mounted on a rotation shaft and polarized in an axial direction; a first back yoke mounted on said magnetic disk; two magnetic sensors arranged opposite to a surface of said magnetic disk in an axial direction with a gap therebetween, said magnetic sensors being mounted on a sensor mounting part of a flexible printed substrate in such a manner that longitudinal directions of said magnetic sensors are substantially parallel to a band-formed wiring part of the flexible printed substrate; a second back yoke mounte d on a back of said magnetic sensors with the flexible printed substrate intervened therebetween, said second back yoke forming a magnetic circuit with said first back yoke and said magnetic disk; and a housing for accommodating said first back yoke, said magnetic sensors, and said second back yoke, wherein said housing is structured in such a manner that a cut-out portion is formed on said housing for drawing out the band-formed wiring part therethrough, the sensor mounting part is formed along a shape of the cut-out portion, and the flexible printed substrate is engaged with said housing to be fixed therein, and said housing comprises a fixing structure such that a stepped portion is formed on an inner surface of said housing, said second back yoke is engaged with said housing with the flexible printed substrate intervened therebetween, and the flexible printed substrate is sandwiched between the stepped portion and said second back yoke to be fixedly arranged therebetween in a mechanical manner. 8. A magnetic micro-encoder, comprising: a magnetic disk mounted on a rotation shaft and polarized in an axial direction; a first back yoke mounted on said magnetic disk; two magnetic sensors arranged opposite to a surface of said magnetic disk in an axial direction with a gap therebetween, said magnetic sensors being mounted on a sensor mounting part of a flexible printed substrate in such a manner that longitudinal directions of said magnetic sensors are substantially parallel to a band-formed wiring part of the flexible printed substrate; a second back yoke mounted on a back of said magnetic sensors with the flexible printed substrate intervened therebetween, said second back yoke forming a magnetic circuit with said first back yoke and said magnetic disk; and a housing for accommodating said first back yoke, said magnetic sensors, and said second back yoke, wherein a number of magnetic poles of said magnetic disk is defined as 2 (1+4n) (where “n” is an integer of 0(zero) or more), said two magnetic sensors are arranged in such a manner that their positions are open to each other in an angle of 90 degrees from the rotation shaft, said housing is structured in such a manner that a cut-out portion is formed on said housing for drawing out the band-formed wiring part therethrough, the sensor mounting part is formed along a shape of the cut-out portion, and the flexible printed substrate is engaged with said housing to be fixed therein, and said housing comprises a fixing structure such that a stepped portion is formed on an inner surface of said housing, said second back yoke is engaged with said housing with the flexible printed substrate intervened therebetween, and the flexible printed substrate is sandwiched between the stepped portion and said second back yoke to be fixedly arranged therebetween in a mechanical manner. 9. A magnetic micro-encoder, comprising: a magnetic disk mounted on a rotation shaft and polarized in an axial direction; a first back yoke mounted on said magnetic disk; two magnetic sensors arranged opposite to a surface of said magnetic disk in an axial direction with a gap therebetween, said magnetic sensors being mounted on a sensor mounting part of a flexible printed substrate in such a manner that longitudinal directions of said magnetic sensors are substantially parallel to a band-formed wiring part of the flexible printed substrate; a second back yoke mounted on a back of said magnetic sensors with the flexible printed substrate intervened therebetween, said second back yoke forming a magnetic circuit with said first back yoke and said magnetic disk; and a housing for accommodating said first back yoke, said magnetic sensors, and said second back yoke, wherein a number of magnetic poles of said magnetic disk is defined as 2 (3+4n) (where “n” is an integer of 0(zero) or more), said two magnetic sensors are arranged in such a manner that their positions are ope n to each other in an angle of 90 degrees from the rotation shaft, said housing is structured in such a manner that a cut-out portion is formed on said housing for drawing out the band-formed wiring part therethrough, the sensor mounting part is formed along a shape of the cut-out portion, and the flexible printed substrate is engaged with said housing to be fixed therein, and said housing comprises a fixing structure such that a stepped portion is formed on an inner surface of said housing, said second back yoke is engaged with said housing with the flexible printed substrate intervened therebetween, and the flexible printed substrate is sandwiched between the stepped portion and said second back yoke to be fixedly arranged therebetween in a mechanical manner. 10. The magnetic micro-encoder according to any one of claims 1 to9, wherein said second back yoke doubles as an end cap to cover an opening of said housing.11. The magnetic micro-encoder according to any one of claims 1 to9, wherein said housing is formed in a substantially cylindrical shape, and said housing is formed in an external diameter of 5 &PHgr; mm or less.12. The magnetic micro-encoder according to any one of claims 1 to9, wherein said second back yoke doubles as an end cap to cover an opening of said housing, said housing is formed in a substantially cylindrical shape, and said housing is formed in an external diameter of 5 &PHgr; mm or less.13. A micromotor, comprising the magnetic micro-encoder according to any one of claims 1 to9.14. A micromotor, comprising the magnetic micro-encoder according to any one of claims 1 to9, wherein said second back yoke doubles as an end cap to cover an opening of said housing.15. A micromotor, comprising the magnetic micro-encoder according to any one of claims 1 to9, wherein said housing is formed in a substantially cylindrical shape, and said housing is formed in an external diameter of 5 &PHgr; mm or less.16. A micromotor, comprising the magnetic micro-encoder according to any one of claims 1 to9, wherein said second back yoke doubles as an end cap to cover an opening of said housing, said housing is formed in a substantially cylindrical shape, and said housing is formed in an external diameter of 5 &PHgr; mm or less.17. A micromotor, comprising: the magnetic micro-encoder according to any one of claims 1 to9; and a speed reducer. 18. A micromotor, comprising: the magnetic micro-encoder according to any one of claims 1 to9, wherein said second back yoke doubles as an end cap to cover an opening of said housing, and a speed reducer. 19. A micromotor, comprising: the magnetic micro-encoder according to any one of claims 1 to9, wherein said housing is formed in a substantially cylindrical shape, and said housing is formed in an external diameter of 5 &PHgr; mm or less, and a speed reducer. 20. A micromotor, comprising: the magnetic micro-encoder according to any one of claims 1 to9, wherein said second mack yoke doubles an end cap to cover an opening of said housing, said housing is formed in a cylindrical shape, and said housing is formed in an external diameter of 5 &PHgr; mm or less, and a speed reducer.