Light projector having a controllable intensity of illumination

Claim 1

A light projector assembly comprising a system for adjusting the intensity of the illumination of a cavity to be examined by means of video camera, said assembly including a light projector having a beam path, a shutter with a shutter aperture being arranged in the light path and having two blades, which are movable towards each other to overlap for a closing action and in the opposite direction for an opening action, the shutter aperture being determined by the area of at least one gap between the mutually opposed blade edges, a video camera for creating a video signal in response to an image being illuminated in said cavity, a monitor screen for receiving the video signal and displaying the image recorded by the video camera, a comparator receiving the video signal as an actual value and comparing it to an adjustable predetermined reference value to create an output signal on an output, a servo-motor being connected to the output of the comparator and opening and closing the shutter aperture in response to the output signal of the comparator to vary the amount of light passing through the shutter aperture to the cavity.