Output efficiency control device, projection-type display apparatus, infrared sensor, and non-contact thermometer
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United States of America Patent
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Jun 6, 2000
Grant Date -
N/A
app pub date -
Jun 25, 1997
filing date -
Nov 1, 1995
priority date (Note) -
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Abstract
Microlenses 3a and 3b are formed on a first surface of a transparent substrate, and an output efficiency control device 2 which modulates a light amount of incident light is provided on a second surface opposing the first surface. Incident light 4 is made to be incident obliquely to an optical axis of the microlens 3a, to be focused on the output efficiency control device 2. The output efficiency control device 2 modulates a light amount of incident light and outputs the light as outgoing light 5 through the microlens 3b. Because of such a structure, the output efficiency control device 2 can be decreased in size, compared with a diameter of a beam and an aperture of a microlens.
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