Patent ID: 8537333

Claim:
Optical imaging device, comprising: an imaging unit adapted to image an object point on an image point and a measuring device, wherein: the imaging unit comprises a first optical element group having at least one first optical element, which is adapted to contribute to the imaging of the object point on the image point, the measuring device is adapted to determine at least one imaging error, which occurs when imaging the object point on the image point, using at least one capturing signal, the measuring device comprises at least one measurement light source, a second optical element group and at least one capturing unit, the measurement light source emits at least one measurement light bundle, the second optical element group comprises at least one optical reference element and one second optical element, which are adapted to guide the at least one measurement light bundle onto the at least one capturing unit in order to generate the at least one capturing signal, the second optical element has a defined spatial relationship with the first optical element, the optical reference element has an at least partially reflective first optical surface and the second optical element has an at least partially reflective second optical surface, and wherein the first optical surface and the second optical surface are arranged with respect to one another to produce multiple reflections of the at least one measurement light bundle between the first optical surface and the second optical surface, the first optical surface has a plane first surface region and the second optical surface has a plane second surface region, the plane first surface region and the plane second surface region defining a path for at least some of the multiple reflections, at least one of a first surface normal to the first surface region and a second surface normal to the second surface region are arranged inclined with respect to a beam axis of the at least one measurement light bundle, the first optical surface or the second optical surface has a plane third surface region, and a third surface normal to the third surface region is arranged inclined with respect to the first surface normal and the second surface normal so that the beam path of the at least one measurement light bundle folds back on itself after a predetermined number of reflections between the first surface region and the second surface region.