Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1998-09-03
2000-10-17
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
359368, G02B 2100, G02B 2126, G02B 702
Patent
active
061335614
ABSTRACT:
An object of the present invention is to provide an electric microscope in which a liquid can be easily filled and removed when an immersion objective lens is inserted or removed into or from an optical path of the microscope. According to the present invention, there is provided an electric microscope comprising an electric revolver with a plurality of objective lenses mounted thereon, either one of which objective lenses disposed on an optical path, a revolver position detecting device for detecting a rotational position of the electric revolver to obtain information related to the objective lens disposed on the optical path, an instruction device for issuing an instruction to change over objective lenses to be disposed on the optical path by electric force, further comprising a memory device which stores information whether each of the plurality of objective lenses is of liquid-permeated type or not, and a control device which controls the drive of the electric revolver so as to stop the electric revolver at a rotational position in the midst of the change-over when it judges that either the objective lens currently on the optical path or an objective lens to be disposed on the optical path next is an immersion objective lens, based on an instruction from the instruction device.
REFERENCES:
patent: 4653878 (1987-03-01), Nakasato et al.
patent: 5517353 (1996-05-01), Itoh et al.
patent: 5706127 (1998-01-01), Saito et al.
patent: 5719699 (1998-02-01), Otomo
patent: 5737134 (1998-04-01), Watanabe et al.
Otomo Masahiko
Toshimitsu Kunio
Allen Stephone B.
Nikon Corporation
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