Light alignment detection device
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United States of America Patent
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Feb 27, 1990
Grant Date -
N/A
app pub date -
Jan 5, 1989
filing date -
Jan 8, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical alignment detector uses a Fresnel bi-prism (12) on the base of which an incoming beam of light is focussed. When the beam is in alignment, it strikes the base substantially normally and is brought to a focus adjacent a ridge (13) of the bi-prism (12). To cope with a second axis of alignment, a second bi-prism (14) having a ridge (15) is placed beneath the first, with the two ridges (13,15) arranged orthogonally so as to produce four possible pupil entrance images which can be received by four photodetectors (17,18,19,20).
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