Micro aspherical lens and fabricating method therefor and optical device
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United States of America Patent
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Sep 6, 1994
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N/A
app pub date -
Jun 16, 1992
filing date -
Nov 9, 1989
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Abstract
An imaging device is formed by a transparent substrate having opposite surfaces on which are formed a plurality of micro aspherical lenses. The axes of the lenses on one surface coincide with the axes of respective lenses on the other surface. A two-dimensional micro lens array constructed by arranging converging lenses having a diameter of approximately several to several hundred micrometers is arranged ahead of a light source, thereby forming a multi-beam spot caused by diffraction in a distant position. A three-dimensional shape can be recognized with high precision by shape recognition means utilizing this multi-beam spot.
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