Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2006-05-09
2006-05-09
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
Reexamination Certificate
active
07041952
ABSTRACT:
A sample P is illuminated by a measurement light beam with an incidence angle differing from 0°; light reflected therefrom is detected; intensity values are recorded and evaluated; and the opening of a field stop is imaged onto a receiving surface, thereby generating an image. In such a method, a value of “light” or “dark” is allocated to each intensity value as a function of a brightness threshold; the smallest rectangle that encloses all “light” positions on the receiving surface is determined; the geometric center point of that rectangle is determined; the position of that point is compared with the position on the receiving surface that corresponds to the geometric center point of the image generated by the field stop in the focused state; and a change in the distance between the sample and the imaging optical system corresponding to the distance between the two points is effected.
REFERENCES:
patent: 4798948 (1989-01-01), Neumann et al.
patent: 5483079 (1996-01-01), Yonezawa
patent: 5604344 (1997-02-01), Finarov
patent: 5747813 (1998-05-01), Norton et al.
Iffland Thomas
Weniger Gert
Wienecke Joachim
Leica Microsystems Jena GmbH
Luu Thanh X.
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