Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1998-07-21
2000-02-08
Rosenberger, Richard A.
Optics: measuring and testing
By polarized light examination
With light attenuation
3562372, G01B 1130
Patent
active
060233338
ABSTRACT:
Device for optical detection of the deformation of a surface with at least one photosensitive receiver having a matrix image plane, which is exposed by at least one light source. It is proposed according to the invention that the light source is constructed as a nearly point-source light with uncollimated light and in imaging optics are provided and adjusted such that the light source is imaged sharply onto the image plane (14) of the photosensitive receiver, so that the surface to be examined acts as a reflective surface, the light source having a known nominal position on the image plane in case of a flawless surface being examined, so that the deformation can be determined from the deviation of the actual position of the image of the light source from the known nominal position of the image of the light source on the image plane. With this arrangement, a deformation, in particular, an erroneous inclination of a CD or DVD, can be detected with high precision and by simple means.
REFERENCES:
patent: 4948258 (1990-08-01), Caimi
patent: 5477332 (1995-12-01), Stone et al.
patent: 5729520 (1998-03-01), Klicker
patent: 5757978 (1998-05-01), Flick et al.
Klicker Jurgen
Laux Wolfram
Basler AG
Rosenberger Richard A.
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