Long working distance lens system, assembly, and method
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United States of America Patent
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Jan 23, 2018
Issued Date -
N/A
app pub date -
Jan 8, 2016
filing date -
Jan 8, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A lens system includes a tube lens and a lens assembly, with the tube lens disposed between an optical sensor and the lens assembly. The lens assembly is disposed between the tube lens and an imaged object. In order to solve the problem of some lens systems having focal lengths that are shorter than the working distances of the lens systems, one aspect of the inventive subject matter described herein provides the lens assembly with a negative lens and plural positive lenses. A first positive lens is located between a second positive lens and an imaging plane, the second positive lens is located between the first positive lens and the negative lens, and the negative lens is located between the second positive lens and the tube lens.
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