Light spot position measuring apparatus having orthogonal cylindrical lenses
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jun 24, 1997
Grant Date -
N/A
app pub date -
Feb 21, 1995
filing date -
Feb 22, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A light spot position measuring apparatus includes a television camera for capturing an image of an object to be measured and an image processing unit. At least two cylindrical lens surfaces are provided in addition to an objective lens of the television camera so as to convert a light spot included in the object to be measured into linear images intersecting each other. The linear images are projected onto an image pickup face of the television camera which produces a corresponding image data. The image processing unit, processes the image data to extract corresponding straight lines. The unit further derives an intersection point of the straight lines and determines a position of the light spot in terms of the derived intersection point. The cylindrical lens surfaces have their cylinder axes which intersect each other. When a pair of the cylindrical lens surfaces having their cylinder axes intersecting orthogonal to each other are provided, a cross-shaped linear image is obtained. The cylindrical lens surfaces may be formed on a single lens or on separate lenses, respectively.
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Cited Art Landscape
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