skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Precision tip-tilt-piston actuator that provides exact constraint

Abstract

A precision device which can precisely actuate three degrees of freedom of an optic mount, commonly referred to as tip, tilt, and piston. The device consists of three identical flexure mechanisms, an optic mount to be supported and positioned, a structure that supports the flexure mechanisms, and three commercially available linear actuators. The advantages of the precision device is in the arrangement of the constraints offered by the flexure mechanism and not in the particular design of the flexure mechanisms, as other types of mechanisms could be substituted. Each flexure mechanism constrains two degrees of freedom in the plane of the mechanisms and one direction is actuated. All other degrees of freedom are free to move within the range of flexure mechanisms. Typically, three flexure mechanisms are equally spaced in angle about to optic mount and arranged so that each actuated degree of freedom is perpendicular to the plane formed by the optic mount. This arrangement exactly constrains the optic mount and allows arbitrary actuated movement of the plane within the range of the flexure mechanisms. Each flexure mechanism provides a mechanical advantage, typically on the order of 5:1, between the commercially available actuator and the functional point on themore » optic mount. This improves resolution by the same ratio and stiffness by the square of the ratio.« less

Inventors:
 [1]
  1. (Livermore, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
872679
Patent Number(s):
5986827
Assignee:
Regents of University of California (Oakland, CA) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
precision; tip-tilt-piston; actuator; provides; exact; constraint; device; precisely; actuate; degrees; freedom; optic; mount; commonly; referred; tip; tilt; piston; consists; identical; flexure; mechanisms; supported; positioned; structure; supports; commercially; available; linear; actuators; advantages; arrangement; constraints; offered; mechanism; particular; design; types; substituted; constrains; plane; direction; actuated; free; move; range; typically; equally; spaced; angle; arranged; degree; perpendicular; formed; exactly; allows; arbitrary; movement; mechanical; advantage; functional; improves; resolution; ratio; stiffness; square; mechanical advantage; optic mount; linear actuators; linear actuator; commercially available; equally spaced; mechanism provides; device consists; commonly referred; exact constraint; plane formed; /359/

Citation Formats

Hale, Layton C. Precision tip-tilt-piston actuator that provides exact constraint. United States: N. p., 1999. Web.
Hale, Layton C. Precision tip-tilt-piston actuator that provides exact constraint. United States.
Hale, Layton C. Fri . "Precision tip-tilt-piston actuator that provides exact constraint". United States. https://www.osti.gov/servlets/purl/872679.
@article{osti_872679,
title = {Precision tip-tilt-piston actuator that provides exact constraint},
author = {Hale, Layton C.},
abstractNote = {A precision device which can precisely actuate three degrees of freedom of an optic mount, commonly referred to as tip, tilt, and piston. The device consists of three identical flexure mechanisms, an optic mount to be supported and positioned, a structure that supports the flexure mechanisms, and three commercially available linear actuators. The advantages of the precision device is in the arrangement of the constraints offered by the flexure mechanism and not in the particular design of the flexure mechanisms, as other types of mechanisms could be substituted. Each flexure mechanism constrains two degrees of freedom in the plane of the mechanisms and one direction is actuated. All other degrees of freedom are free to move within the range of flexure mechanisms. Typically, three flexure mechanisms are equally spaced in angle about to optic mount and arranged so that each actuated degree of freedom is perpendicular to the plane formed by the optic mount. This arrangement exactly constrains the optic mount and allows arbitrary actuated movement of the plane within the range of the flexure mechanisms. Each flexure mechanism provides a mechanical advantage, typically on the order of 5:1, between the commercially available actuator and the functional point on the optic mount. This improves resolution by the same ratio and stiffness by the square of the ratio.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

Patent:

Save / Share: