Position detecting device employing marks and oblique projection

Details Position detecting device employing marks and oblique projection Position detecting device employing marks and oblique projection

1992-03-02

1992-11-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

356401, G01N 2186

Patent

active

051626560

ABSTRACT:
A device for detecting positional relationship between a first and second objects in a predetermined direction is disclosed. The device includes light source for projecting light upon the first object so that the light incident on the first object is deflected thereby and emanates therefrom in a direction perpendicular to the predetermined direction; a light receiving portion disposed in a direction in which the light having been deflected perpendicularly to the predetermined direction and having been deflected again by the second object advances, the light receiving portion being operable to detect the position of incidence of the light thereupon, wherein the position of the light upon the light receiving means is changeable with the position of incidence of the light upon the second object; and a detecting system for detecting the positional relationship between the first and second objects in the predetermined direction, on the basis of the detection by the light receiving portion.

REFERENCES:
patent: 4037969 (1977-07-01), Feldman et al.
patent: 4211489 (1980-07-01), Kleinknecht et al.
patent: 4326805 (1982-04-01), Feldman et al.
patent: 4340305 (1982-07-01), Smith et al.
patent: 4360273 (1982-11-01), Thaxter
patent: 4631416 (1986-12-01), Trutna
patent: 4641035 (1987-02-01), Suzuki et al.
patent: 4771180 (1988-09-01), Nomura et al.
patent: 4779001 (1988-10-01), Makosch

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