Crystal diffraction lens with variable focal length
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United States of America Patent
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Apr 2, 1991
Grant Date -
N/A
app pub date -
Dec 29, 1988
filing date -
Dec 29, 1988
priority date (Note) -
Expired
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Abstract
A method and apparatus for altering the focal length of a focusing elemento one of a plurality of pre-determined focal lengths by changing heat transfer within selected portions of the element by controlled quantities. Control over heat transfer is accomplished by manipulating one or more of a number of variables, including: the amount of heat or cold applied to surfaces; type of fluids pumped through channels for heating and cooling; temperatures, directions of flow and rates of flow of fluids; and placement of channels.
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