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Title: Lead magnesium niobate actuator for micropositioning

Abstract

An improved lead magnesium niobate actuator is disclosed comprising a cylindrical lead magnesium niobate crystal stack mounted in a cylindrical casing wherein a bias means, such as one or more belleville washers, is located between one end of the crystal stack and a partially closed end of the casing; and adjustment means are provided which bear against the opposite end of the crystal stack, whereby an adjustable compressive force is constantly applied against the crystal stack, whether the crystal stack is actuated in an extended position, or is in an unactuated contracted position. In a preferred embodiment, cooling ports are provided for the circulation of coolant in the actuator to cool the crystal stack, and provision is made for removal and replacement of the crystal stack without disconnecting the actuator from the external device being actuated.

Inventors:
 [1];  [2]
  1. (Livermore, CA)
  2. (Concord, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
869580
Patent Number(s):
5359252
Assignee:
United States of America as represented by United States (Washington, DC) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
lead; magnesium; niobate; actuator; micropositioning; improved; disclosed; comprising; cylindrical; crystal; stack; mounted; casing; bias; means; belleville; washers; located; partially; closed; adjustment; provided; bear; opposite; whereby; adjustable; compressive; force; constantly; applied; actuated; extended; position; unactuated; contracted; preferred; embodiment; cooling; ports; circulation; coolant; cool; provision; removal; replacement; disconnecting; external; device; compressive force; lead magnesium; adjustment means; disclosed comprising; extended position; preferred embodiment; cylindrical casing; magnesium niobate; niobate actuator; niobate crystal; external device; contracted position; /310/

Citation Formats

Swift, Charles D., and Bergum, John W. Lead magnesium niobate actuator for micropositioning. United States: N. p., 1994. Web.
Swift, Charles D., & Bergum, John W. Lead magnesium niobate actuator for micropositioning. United States.
Swift, Charles D., and Bergum, John W. Sat . "Lead magnesium niobate actuator for micropositioning". United States. https://www.osti.gov/servlets/purl/869580.
@article{osti_869580,
title = {Lead magnesium niobate actuator for micropositioning},
author = {Swift, Charles D. and Bergum, John W.},
abstractNote = {An improved lead magnesium niobate actuator is disclosed comprising a cylindrical lead magnesium niobate crystal stack mounted in a cylindrical casing wherein a bias means, such as one or more belleville washers, is located between one end of the crystal stack and a partially closed end of the casing; and adjustment means are provided which bear against the opposite end of the crystal stack, whereby an adjustable compressive force is constantly applied against the crystal stack, whether the crystal stack is actuated in an extended position, or is in an unactuated contracted position. In a preferred embodiment, cooling ports are provided for the circulation of coolant in the actuator to cool the crystal stack, and provision is made for removal and replacement of the crystal stack without disconnecting the actuator from the external device being actuated.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {1}
}

Patent:

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