Positioning and machining apparatus having a scanner for circula

Details Positioning and machining apparatus having a scanner for circula Positioning and machining apparatus having a scanner for circula

1987-04-21

1989-04-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356401, G01N 2186

Patent

active

048188794

ABSTRACT:
In a positioning apparatus wherein a projecting arrangement projects a light beam towards an object which has a mark extending thereon in a predetermined direction, a circularly scanning arrangement is optically coupled to the projecting arrangement to make the light beam circularly scan the object. Whenever the light beam intersects the mark, a particular beam is produced from the mark. Dependent on the particular beam, the object is quickly positioned at a desired position.

REFERENCES:
patent: 4441020 (1984-04-01), Sakamoto et al.
patent: 4535431 (1985-08-01), Bricot et al.
patent: 4578574 (1986-03-01), Grant et al.
patent: 4642468 (1987-02-01), Tabata et al.
patent: 4658127 (1987-04-01), Ferrari
patent: 4701053 (1987-10-01), Ikenaga
patent: 4710963 (1987-12-01), Chapman et al.

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