Apparatus for generating a light curtain

Details Apparatus for generating a light curtain Apparatus for generating a light curtain

1990-07-10

1992-01-14

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359217, 250235, G02B 2610

Patent

active

050804570

ABSTRACT:
An apparatus is described for generating a light curtain which includes an originally spherical strip-like concave mirror 10 and a light deflecting element 12 arranged in the vicinity of the focal point of the concave mirror. The light deflecting element 12 guides a bundled light beam periodically over the concave mirror 10. The strip-like concave mirror 10 is twisted within itself in such a way that each surface portion of the concave mirror 10 which is illuminated during a complete sweep of the light beam extends at at least substantially the same angle to the beam axis in a plane perpendicular to the scanning direction.

REFERENCES:
patent: 4116527 (1978-09-01), Sick
patent: 4196961 (1980-04-01), Walter et al.
patent: 4230394 (1980-10-01), Brueggemann et al.
patent: 4848864 (1989-07-01), Ostertag et al.

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