Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1992-11-13
1994-05-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
2502017, 2502013, G02B 2306
Patent
active
053171420
ABSTRACT:
The automatic focusing apparatus of this invention focuses the measuring beam emitted from a light source on a sample through one side of the pupil of an objective lens, causes light reflected by the sample to pass through the pupil of the objective lens again, focuses the light passing through the pupil of the objective lens on a light-receiving unit, and detects the spot position of the focused light. Especially, this automatic focusing apparatus has a first light-shielding member for shielding light reflected by the lower surface of a transparent thin plate in the vicinity of the focal point of the light reflected by the lower surface of the transparent thin plate, or a second light-shielding member for transmitting therethrough only light reflected by the upper surface of the transparent thin plate in the vicinity of the focal point of the light reflected by the upper surface of the transparent thin plate.
REFERENCES:
patent: 4496832 (1985-01-01), Sakai et al.
patent: 5033856 (1991-07-01), Nose et al.
patent: 5162641 (1992-11-01), Fountain
Dosaka Shinichi
Kurosawa Hiroshi
Noda Hiroaki
Lee John R.
Nelms David C.
Olympus Optical Co,. Ltd.
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