Patent ID: 7933066

Claim:
A surgical microscope for use in surgical procedures including neurosurgery, the surgical microscope comprising: an illuminating arrangement for providing and guiding illuminating light along a beam path to a region of surgery examined with said surgical microscope; said illuminating arrangement including a high-power light source for generating said illuminating light; an intensity adjusting device for adjusting the intensity of the illuminating light guided to said region of surgery between a maximum value and a minimum value; a control unit for said illuminating arrangement; said control unit including an operator-controlled module via which said illuminating arrangement is activated and controlled; said control unit comprising a control loop; a sensor for detecting the intensity of said illuminating light of said illuminating arrangement being connected to said control loop; said sensor being provided at a path-folding mirror to receive a fraction of said illuminating light being guided to said path-folding mirror; wherein said control loop outputs a position signal to said intensity adjusting device for controlling said intensity of said illuminating light outputted by said illuminating arrangement to a pregiven value; and, said fraction of said illuminating light being guided to said path-folding mirror through a bore in said path-folding mirror.