Method of and apparatus for the automatic focusing of stereoscop

Details Method of and apparatus for the automatic focusing of stereoscop Method of and apparatus for the automatic focusing of stereoscop

1975-05-06

1977-05-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250558, G01J 136

Patent

active

040257851

ABSTRACT:
For automatic focusing of a stereoscopic microscope a focusing beam of rays, preferably in the infrared range of wave length, is generated by a pulse light source, and focused on the object to be observed in the form of a small luminous area which is superimposed on the observation rays. The rays reflected back by the object along the divided paths of the observation rays are deflected from those paths and directed to impinge on separate photoelectric detectors which convert axial shifts of the object plane with respect to the microscope into a directionally dependent electric signal which controls a focusing motor to move the microscope to compensate for such shifts. A switch is provided to permit manual adjustment of focus preparatory to automatic adjustment.

REFERENCES:
patent: 3418477 (1968-12-01), Knutrud et al.
patent: 3628857 (1971-12-01), Harvey
patent: 3721827 (1973-03-01), Reinheimer
patent: 3846629 (1974-11-01), Stauffer
patent: 3883689 (1975-10-01), Mansour et al.

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