Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1996-04-03
1997-07-01
Hecker, Stuart N.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
31856821, H01F 708, G05B 1904
Patent
active
056442793
ABSTRACT:
A magnetic actuator design and method of use is provided that generally reduces problems associated with conventional actuators and can be specifically employed to increase the accuracy of actuator type precision operations, such as surface mounted electrical component placement, die and attach tooling movements, and tape and reel part storage tooling. The actuator includes a housing, a stem slidably disposed and having a rest position within the housing, a first magnetic portion attached to the stem and, a second magnetic portion attached to the housing, the second magnetic portion being of sufficient strength and oriented to exert a generally predetermined force on said first magnetic portion sufficient to resist displacement of said stem from said rest position. In a preferred embodiment for use in the head of a pick and place machine, the stem is a nozzle through which a vacuum can be drawn, and the first and second magnetic portions are rare earth magnets that are oriented so as to produce an attractive force between the magnets. The first magnet is attached to a stem holder, which is seated on the housing in the rest position and is used to prevent rotation of the stem about a longitudinal axis.
REFERENCES:
patent: 2690529 (1954-09-01), Lindblad
patent: 3675166 (1972-07-01), McCloskey et al.
patent: 3848216 (1974-11-01), Gamble
patent: 4470030 (1984-09-01), Myers
patent: 5270625 (1993-12-01), Neff
patent: 5285946 (1994-02-01), Tomigashi et al.
patent: 5422554 (1995-06-01), Rohde
Bettinger Michael J.
Piper John G.
Hecker Stuart N.
Micro)n Technology, Inc.
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