Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1975-01-23
1976-06-29
Stolwein, Walter
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250235, 250216, G01J 120
Patent
active
039671097
ABSTRACT:
In a system which automatically analyzes laboratory slides, the adjustable objective lens is automatically focused. A beam splitter splits light from the slide into two parts. One slide image is projected to an actual image plane where it is converted into electrical signals representing the optical characteristics of the slide. The other slide image is projected to a parfocal image plane at which two light sensing devices for the focusing system are positioned. One light sensing device is in front of the parfocal image plane and the other is behind the parfocal image plane. These light sensing devices produce electrical signals representing the position of the actual image plane with respect to the desired image plane. The electric signals are differentiated and then applied to a comparator which supplies pulses to a stepping motor which moves the objective lens. The coupling between the stepping motor and the objective lens includes an eccentric member which translates the objective lens with no sliding friction. This allows very accurate positioning of the objective lens.
REFERENCES:
patent: 2850239 (1958-09-01), Polanti et al.
patent: 3351744 (1967-11-01), Masterson
patent: 3493764 (1970-02-01), Craig
patent: 3532045 (1970-10-01), Genahr
patent: 3610934 (1971-10-01), Turner
patent: 3622797 (1971-11-01), Bragg
patent: 3670153 (1972-06-01), Rempert et al.
patent: 3708619 (1973-01-01), Martin
patent: 3883689 (1975-05-01), Mansour et al.
Amos Lynn G.
Boone Jerry S.
Corning Glass Works
Patty, Jr. Clarence R.
Stolwein Walter
Zebrowski Walter S.
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