Browse Prior Art Database

Dual Motion Linear Actuator

IP.com Disclosure Number: IPCOM000084574D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Garcia, JL: AUTHOR [+2]

Abstract

The device as depicted in the figure is a dual-motion actuator with motion along the Z axis and motion along the R axis.

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Dual Motion Linear Actuator

The device as depicted in the figure is a dual-motion actuator with motion along the Z axis and motion along the R axis.

The Z-axis motion is performed by Z-actuator 10. Z-actuator 10 is a conventional linear actuator with a magnetic structure, positioning coils and guide rails 14 and 16. When Z-actuator 10 is activated, R-actuator 20 can be positioned at any desired point on guide rails 14 and 16.

Once R-actuator 20 is at rest along guide rails 14 and 16 a head arm, not shown, is extended through access opening 22 (in a direction parallel to the R- axis) to write or read information on a disc pack, not shown.

R-actuator 20 is an open structure, i.e., its magnetic structure has only two rectangular magnets namely; an upper rectangular magnet 24 and a not shown lower rectangular magnet. The magnets are of single polarity and divide the magnetic path to either end of the structure, thereby doubling the actuator stroke length capability. The lower rectangular magnet has identical dimensions as magnet 24, and is positioned so that its longitudinal dimension is parallel to that of magnet 24.

Return path 28 is positioned between the rectangular magnets. Four gap position shims 30, 32 (only two of which are shown) are positioned at each end of the rectangular magnets, respectively. By positioning the shims in this manner, a pair of air gaps 40 ( only one of which is shown) are achieved.

Two guide rods 42 (only one of which is shown) are posit...