Distance and tilt sensing apparatus

Details Distance and tilt sensing apparatus Distance and tilt sensing apparatus

1990-10-22

1992-03-31

Hix, L. T.

Photocopying

Projection printing and copying cameras

Step and repeat

355 55, G03B 2752

Patent

active

051012260

ABSTRACT:
In the distance and tilt sensing apparatus disclosed herein, an image of a light source is projected by a lens obliquely onto a surface to be sensed. A ring reticle is interposed in the optical path between the light source and the lens at a distance from the lens substantially equal to its focal length. A second lens projects a remote image of the first object image onto a detector. The light projected from the second lens is split into two paths. An aperture reticle is interposed in one of the paths at a distance from the second lens substantially equal to its focal length, an image of the center of the ring reticle being formed on the aperture reticle. A position responsive optical detector aligned with the aperture reticle senses the position of the image of the center of the ring reticle relative to the center of the aperture and that position is indicative of the tilt of the surface around an axis essentially perpendicular to the axis of the incident light.

REFERENCES:
patent: 4504144 (1985-03-01), Trost
patent: 4558949 (1985-12-01), Uehara et al.
patent: 4650983 (1987-03-01), Suwa
patent: 4801977 (1989-01-01), Ishizaka et al.
patent: 4999669 (1991-03-01), Sakamoto et al.

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