Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1983-05-09
1985-02-26
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
350 62, G01J 120
Patent
active
045019622
ABSTRACT:
Automatic focusing apparatus comprising a beam focusing assembly disposed for directing through an axially spaced focal spot a scanning light beam having a periodic translational movement characterized by a first fundamental frequency component, a focus evaluating assembly disposed for detecting adjacent the focal spot a periodic translational movement of the focused beam characterized by a fundamental frequency component which is compared with said first fundamental frequency component to determine the relative phase relationship, and a target positioning assembly disposed for automatically positioning a selected surface of a target at the focal spot in accordance with the periodic translational movement of the focused beam and said determination of relative phase relationship.
This automatic focusing apparatus may be embodied in a laser material removal system having a laser source connected to the focus evaluating assembly for automatic activation when the selected surface of a target is positioned at the focal spot to direct a light beam of suitably high energy onto the selected surface for removing material therefrom.
REFERENCES:
patent: 3418477 (1968-12-01), Knutrud et al.
patent: 3932700 (1976-01-01), Snopko
patent: 4074312 (1978-02-01), Van Rosmalen
patent: 4146327 (1979-03-01), Harris
patent: 4201475 (1980-05-01), Bodlav
Meaney John T.
Nelms David C.
Pannone Joseph D.
Raytheon Company
Sharkansky Richard M.
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