Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1988-11-17
1990-06-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
350519, G01J 120
Patent
active
049356127
ABSTRACT:
A microscope with continuously or discontinuously variable objective magnification is provided with an autofocus system whose beam path passes through the objective and is directed out of the imaging beam path of the microscope between objective and eye piece to at least one photo-electric detector means. At least one optical system is located or locatable in the beam path of the autofocus system which allows or causes the at least one image formed on the detector means to be altered in scale when a change in the objective magnification occurs. The at least one optical system can be a zoom system or a series of lenses or fixed lens systems arranged to be inserted into the beam path of the focusing system. When the objective or objective magnification is changed, a coupling mechanism serves to appropriately vary the focal length of the at least one optical system located or locatable in the beam path of the autofocus system. Furthermore, a pattern comprising a light/dark contrast is projected into the object plane. This ensures in incident light operations that the system is optimally focused even with low contrast objects.
REFERENCES:
patent: 4595829 (1986-06-01), Neumann et al.
patent: 4609814 (1986-09-01), Nobuaki et al.
patent: 4620089 (1986-10-01), Schlichting et al.
patent: 4639587 (1987-01-01), Chadwick et al.
patent: 4687913 (1987-08-01), Chaban
patent: 4694151 (1987-09-01), Yoshimura
patent: 4803352 (1989-02-01), Bierleutgeb
Allen Stephone B.
Nelms David C.
Reichert Jung Optische Werks, A.G.
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