Autofocus binocular stereomicroscope

Details Autofocus binocular stereomicroscope Autofocus binocular stereomicroscope

1992-07-27

1993-11-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502016, 250225, G01J 120

Patent

active

052667910

ABSTRACT:
A binocular stereomicroscope comprises a binocular magnifying optical system, which is composed of right and left sets of elements, an objective lens, which is located in front of the binocular magnifying optical system, and an illumination device for irradiating a light beam for illumination, which has been produced by a light source, to an object via the objective lens. Semi-transparent mirrors are respectively interposed in the right and left sets of elements of the binocular magnifying optical system. A distance measuring device is provided with detection elements, on which images of light beams separated by the semi-transparent mirrors are formed. The distance measuring device generates a distance measurement signal from the relationship between positions, at which the right and left images of the light beams separated by the semi-transparent mirrors are formed. An automatic focusing function carries out a focusing function by operating a focusing mechanism in accordance with the distance measurement signal, which is generated by the distance measuring device.

REFERENCES:
patent: 4356392 (1982-10-01), Wittekoek et al.
patent: 4412127 (1983-10-01), Imai
patent: 4447717 (1984-05-01), Nohda
patent: 4516840 (1985-05-01), Nakahashi et al.
patent: 4737022 (1988-04-01), Faltermeier et al.
patent: 5081344 (1992-01-01), Misawa

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