Ernst Leitz Wetzlar Gmbh

Dietrich Bruckner

Werner Holle

Kurt Henkelmann

Slide projectors with automatic focusing systems consisting of a scanning auxiliary projecting system and a position control focusing the slide and comprising a light sensor detecting the reflections from the slide are improved by mounting the light sensor outside the scattered light zone generated when the main projection beam passes through the slide. The light source of the auxiliary projecting system is operated at less than rated voltage and silicon cells are used as light detectors. The light course comprises a lens which is mounted in the same manner as the light sensor on holders and the holders are pivotably supported for the purpose of adjustments.

Slide projector with automatic focusing system

An optical system for the metering of illumination in photographic cameras, in particular mirror-reflex cameras, which makes use of a photodetector with a light-sensitive surface small in comparison to the image area to be metered and which is mounted in the lower camera space. A honeycomb mirror consisting of a multitude of convex or concave mirror elements is mounted behind the reflex-mirror which is partly transmitting. The honeycomb mirror when it is in the metering position is located in front of the film plane and is moved together with the reflex-mirror out of the way of the beam path before the picture is taken, the mirror elements of the honeycomb mirror being slanted so that the center of every individual element reflects the principal rays toward the photodetector. The curvature of the mirror elements is such that the outermost peripheral rays from the objective are reflected from the rims of the mirror elements toward the photodetector.

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Nauborn, Germany

Dietrich Bruckner