Patent ID: 7675205
Filing Date: 2010-03-09
Classification: H02K

Abstract:
1. A driving apparatus comprising: a cylindrical magnet circumferentially magnetized; a first stator for being excited by a first coil; a second stator for being excited by a second coil; a first bobbin for fixing said first coil, said first bobbin including at least one first engaging portion for being shifted between a disengaged state from said first stator and an engaged state with said first stator; a second bobbin for fixing said second coil, said second bobbin including at least one second engaging portion for being shifted between a disengaged state from said second stator and an engaged state with said second stator; at least one first switching member for shifting said first engaging portion of said first bobbin from the disengaged state from said first stator to the engaged state with said first stator when a first stator unit assembled from said first stator and said first bobbin is coupled to a second stator unit assembled from said second stator and said second bobbin; and at least one second switching member for shifting said second engaging portion of said second bobbin from the disengaged state from said second stator to the engaged state with said second stator when the first stator unit is coupled to the second stator unit, wherein said first switching member is provided in said second stator, and said second switching member is provided in said first stator, when said first stator is coupled to said second bobbin, said second switching member provided in said first stator causes the second engaging portion of said second bobbin to shift from the disengaged state from said second stator to the engaged state with said second stator, and when said second stator is coupled to said first bobbin, said first switching member provided in said second stator causes the first engaging portion of said first bobbin to shift from the disengaged state from said first stator to the engaged state with said first stator; wherein said first stator includes a first stator base portion and a plurality of first tooth-shaped magnetic pole portions axially extending from said first stator base portion, at least one of said first magnetic pole portions having a tip end portion thereof forming said second switching member; said second stator includes a second stator base portion and a plurality of second tooth-shaped magnetic pole portions axially extending from said second stator base portion, at least one of said second magnetic pole portions having a tip end portion thereof forming said first switching member; said first bobbin includes a first bobbin base portion and a plurality of tooth-shaped first jaw portions thereof axially extending from said first bobbin base portion and each having opposite side edges, at least one of said first jaw portions being provided with said first engaging portion in at least one of the opposite side edges thereof, each of said first magnetic pole portions being inserted between corresponding adjacent ones of said first jaw portions, and said at least one first jaw portion or at least one different first jaw portion being formed with at least one first recess into which said first switching member formed by the tip end portion of said second magnetic pole portion can be inserted; said second bobbin includes a second bobbin base portion and a plurality of tooth-shaped second jaw portions thereof axially extending from said second bobbin base portion and each having opposite side edges, at least one of said second jaw portions being provided with said second engaging portion in at least one of the opposite side edges thereof, each of said second magnetic pole portions being inserted between corresponding adjacent ones of said first jaw portions, and said at least one first jaw portion or at least one different first jaw portion being formed with at least one second recess into which said second switching member formed by the tip end portion of said first magnetic pole portion can be inserted.