Laser scanning apparatus with beam position correction

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems

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250235, G01J 120

Patent

active

042794722

ABSTRACT:
This invention relates to a scanning apparatus in which a spot of light is swept or scanned over a receiving surface (11,27). The intensity of the spot may be modulated during scanning to build up a two-dimensional image on the receiving surface, or alternatively, the spot of light may be used to analyze the receiving surface to monitor its reflectivity or transmissivity. The scanning apparatus includes error detection means (13, 14, 15, 16, 20, 21, 43, 44, 45) to measure any error in the real or apparent position of the light source (1, 29), or the position of the receiving surface in a direction transverse to the scanning direction, an acousto-optic cell (4, 34) positioned in the light path between the light source and the receiving surface and arranged so that, in use, it causes the light beam from the light source to be deflected transverse to the scanning direction, and means (22, 23, 24, 25, 26) responsive to the error detection means to influence the deflection of the light beam in the acousto-optic cell to generate a deflection which compensates for any error in the real or apparent position of the light source or that of the receiving surface in the direction transverse to the scanning direction.

REFERENCES:
patent: 3809806 (1974-05-01), Walker et al.
patent: 4002830 (1977-01-01), Brown et al.
patent: 4206348 (1980-06-01), Davy et al.

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