Optical: systems and elements – Compound lens system – Microscope
Patent
1997-06-13
1999-04-20
Nguyen, Thong
Optical: systems and elements
Compound lens system
Microscope
359368, 359385, G02B 2106
Patent
active
058962239
ABSTRACT:
An optical system for use in a microscope and other optical systems has an unlimited depth of focus. The optical system comprises a lens set comprising a first optical element and a second optical element; mechanisms for continuously oscillating the focal length of the lens set in stepwise increments; and mechanisms for permitting light to pass through the lens set when the focal length is momentarily fixed and for preventing light to pass through the lens set when the focal length is not momentarily fixed. The rapid (i.e., greater than about 16 images a second) and sequential replacement of images in a plane parallel to and at a fixed distance will provide an unlimited depth of focus to elicit in the observer a sense of sharp focus of the entire observed object.
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Letcher Frank S.
Tigliev George S.
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