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公开(公告)号：CA2039351C
公开(公告)日：1995-09-26
申请号：CA2039351
申请日：1991-03-28
Applicant: IBM
Inventor： CHILDERS EDWIN RALPH , FENNEMA ALAN AUGUST , MCREYNOLDS DAVID PAUL
Abstract: An optical disk recorder, or other apparatus, use a rotary actuator for supporting a work tool, such as an objective lens which is pivotable or rotatable about a pivot pin. Rotation causing or tracking coils on the rotary actuator are disposed adjacent to permanent magnets to selectively effect rotation of the rotary actuator about the pivot pin. A bias electrical current is supplied to these coils to generate magnetic fields which are in opposite rotational senses; such fields force the rotary actuator against the pin in such a manner that the point of contact between the rotary actuator and the pin follows the rotation of the actuator about the pin.
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公开(公告)号：AU7523891A
公开(公告)日：1991-12-05
申请号：AU7523891
申请日：1991-04-23
Applicant: IBM
Inventor： CHILDERS EDWIN RALPH , FENNEMA ALAN AUGUST , MCREYNOLDS DAVID PAUL
Abstract: The present invention relates to a rotatable work tool assembly comprising a rotatable body (13), a fixed holder for the body, a work tool (22) mounted on the body, a pivot pin (21) extending from the holder, and a recess (20A) within the body adapted to receive the pivot pin so that the body can rotate about the pivot pin relative to the holder and the work tool can move into a selected work position. According to the invention the assembly is characterized in that it comprises biasing means for applying a biasing force to the body in a direction along a line extending from the axis of the pivot pin to the work tool for all positions of the body as it rotates so as to tend to prevent any movement of the body relative to the pivot pin along the line due to spacing between the outer surface of the pivot pin and the inner surface of the recess.
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