| 摘要 |
The invention relates to an optical scanning apparatus for the seeking of faults on throughmoving material webs (29) and comprises at least one light source, a mirror wheel (12) arranged in a housing (13) which periodically deflects a light beam produced from the light source in order to generate a scanning beam with which the material web (29) can be scanned transverse to its direction of through-movement (B) along a scanning line (21). A light deflecting device (16) is provided in the housing (13), is arranged after the mirror wheel (12) and brings about a multiple folding of the scanning beam path out of the plane of the fan of scanning beams. The mirror wheel (12) is arranged in the housing (13) with its axis of rotation (14) above one end of the scanning line (21'), with the housing with the optical components (25, 16) arranged therein forming a main scanning module (10). An auxiliary scanning module (11) with a build-on housing (17) can be mounted on the housing (13) of the main scanning module (10) at the side associated with the mirror wheel (12), with a second light source and a second light deflecting means (19) being provided in the build-on housing. In this arrangement the optical components (19, 25) of the auxiliary module (11) are arranged essentially in mirror symmetry to the optical components (16, 25) of the main module. (FIG.
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