Light curtain apparatus

Details Light curtain apparatus Light curtain apparatus

1987-10-15

1989-10-24

Arnold, Bruce Y.

350 68, G02B 2610

Patent

active

048757616

ABSTRACT:
Light from a scanning device is directed onto a row of inclined strip mirrors 11a, 11b, 11c which are arranged one behind the other and laterally displaced relative to each other at an angle of 45.degree. to the incident light beam 16". The strip mirrors form the incident light into a number of light curtains 13a, 13b, 13c corresponding to the number of mirrors, with the individual light curtains being laterally displaced in the same way as the strip mirrors. The individual light curtains then fall onto a corresponding number of deflecting mirrors 12a, 12b, 12c which are set at an angle of 45.degree. to the incident light curtains. The deflecting mirrors thus deflect the light curtains through an angle 90.degree. and indeed into the same plane so that the undesired lateral displacement is cancelled and a broad light curtain is achieved which extends in a single plane.

REFERENCES:
patent: 4302105 (1981-11-01), Sick
patent: 4431309 (1984-02-01), Sick et al.
patent: 4460240 (1984-07-01), Hudson
patent: 4681453 (1987-07-01), Sick

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