Patent ID: 6043958
Filing Date: 2000-03-28
Classification: G11B

Abstract:
A device for positioning a first and a second element relatively to each other, said device comprising lifting means for causing said first and said second element to variably position relatively to each other along a predetermined direction and actuator means for actuating said lifting means, wherein said lifting means comprise a cam element actuated by said actuator means, said cam element having a plurality of contiguously arranged sectors, each sector having only one smooth linear surface for causing said first or second element to move, said sector belonging to first and second interleaved and alternating groups, said linear surfaces being shaped such that a response of said lifting means to said actuator means has different values in said first and second groups thereby providing alternatively a coarse positioning in sectors belonging to said first group and a fine positioning in sectors belonging to said second group when said cam element is actuated in a predetermined direction, and that successive positionings achieved by one of said groups provide a series of separate positioning ranges.