Arrangement for illumination and scanning of an object by means of a scanning disk similar to a Nipkow disk

Claim 1

In a device for tandem scanning of an object having an arrangement for illumination and scanning of an object by means of a rotating scanning disk having diametrically opposed, spirally arranged elementary openings, and further having a light splitting system including a semitransparent mirror with a partially reflective coating on one side and no coating on the other side, and wherein an illuminating light ray is passed through a first elementary opening on said rotating disk and passed into said light splitting system whereby a portion of said light ray is passed through said semitransparent mirror to the object, and an image light ray is reflected from said object back to said semitransparent mirror, and a portion thereof reflected from said surface having the reflective coating such that said light splitting system will thereafter reflect said partial image light ray through a second elementary opening on said disk, and then passed to where an image of said object can be viewed; the improvement comprising said semitransparent mirror having a thickness sufficient to space apart said partial image light ray reflected from said surface having said reflective coating from any partial light ray reflected from said uncoated surface such that only the partial light ray reflected from said coated surface will pass through said second elementary opening, and any partial image light ray reflected from said uncoated surface is blocked by said disk.