Browse Prior Art Database

Pivot Joint for Low Cost Optical File Actuator

IP.com Disclosure Number: IPCOM000122941D
Original Publication Date: 1998-Jan-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Luecke, L: AUTHOR

Abstract

Disclosed is a joint design which allows free motion in two rotational degrees of freedom over a limited range, while precluding motion in the remaining four degrees of freedom. In this application, it allows both tracking and focus motions of a rotary actuator in an optical file.

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Pivot Joint for Low Cost Optical File Actuator

      Disclosed is a joint design which allows free motion in two
rotational degrees of freedom over a limited range, while precluding
motion in the remaining four degrees of freedom.  In this
application, it allows both tracking and focus motions of a rotary
actuator in an optical file.

      As shown in the Figure, the lower pivot point is a simple
ball-in-socket joint.  The upper pivot consists of a ball riding in a
pair of concave toric surfaces.  One toric surface segment is
fastened to the arm; the other is attached to a flat spring which
preloads the assembly.  The toric surfaces may be made from the outer
race of a conventional ball bearing, or they may be molded or
machined as part of the arm and spring.

      The visco-elastic damping material which connects the arm to
the optics body increases the frequency and reduces the amplitude of
resonances by allowing very slight motion between the tube and body
as the voice coil motor is energized, absorbing energy which
otherwise would  be reflected back down the arm.