Scanner for the optical scanning of objects

Details Scanner for the optical scanning of objects Scanner for the optical scanning of objects

1987-11-25

1989-07-18

Bovernick, Rodney B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

350 67, 250235, G02B 2610

Patent

active

048488640

ABSTRACT:
In a scanner for the optical checking of objects such as CD-discs there is provided a coherent light source; a light deflecting device which allows a light beam emitted from the light source to sweep over the object in a substantially linear scanning movement, with the optical axis of the light beam subtending a small angle with a normal to the object surface transverse to the scanning direction; and a detector for detecting light which is reflected back from the object. In the present arrangement the optical axis of the light beam also subtends a small angle with the normal to the object surface in the scanning direction. This makes it possible to avoid disturbing modulation of the detector signal due to interference effects.

REFERENCES:
patent: 4199219 (1980-04-01), Suzki et al.
patent: 4291987 (1981-09-01), Sick et al.
patent: 4357071 (1982-11-01), Mankel et al.
patent: 4629885 (1986-12-01), Asemyr

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