Kurt Henkelmann

Title: Kurt Henkelmann: Slide-Projector Innovations

Introduction

Kurt Henkelmann is an inventor associated with Wismar, Germany, and Ernst Leitz Wetzlar GmbH. His work includes improvements to slide-projector focusing and slide-changing mechanisms. His recorded portfolio includes 2 patents.

Latest Patents

Henkelmann’s patent for a slide projector with an automatic focusing system describes a scanning auxiliary projection system and position control that focus the slide by detecting reflected light. The design places the light sensor outside the scattered-light zone of the main projection beam, operates the auxiliary light source below its rated voltage, and uses silicon cells as detectors. It also describes adjustable, pivot-mounted holders for the sensor and a lens in the auxiliary light path.

His patent for a projector with slide-changer controls addresses the coordinated operation of the slide-changing mechanism and its stop. Motor-driven cams time the stop’s closure with the removal of the projected slide and insertion of the next slide. The stop begins opening immediately after it has fully closed, while interlocking components keep it closed during a change when no slide is inserted. The mechanism is overridden by the slide when a new slide is introduced or a previous slide is reinserted.

Career Highlights

Henkelmann’s documented inventions focus on practical projector engineering. One improves automatic focusing by managing the auxiliary light path and sensor placement, while the other coordinates slide movement and shutter operation to support a controlled slide change.

Collaborations

Henkelmann is associated with Ernst Leitz Wetzlar GmbH. His named coworkers include Wilhelm Schafer and Rolf Speier.

Conclusion

Kurt Henkelmann’s two recorded patents reflect a focused contribution to slide-projector technology, combining automatic focusing improvements with carefully timed slide-changing controls.