Design of a fast and high precision polygonal scanner for HDTV

With the continuing development of Laser-Display-Technology, a new possibility for the production high level image projection is forwarded and with it the beginning of a new era in television: TV picture formats previously thought impossible, the sharpness, color intensity and unsurpassed resolution of which make the dream of home cinema a reality. The key to this experience is visible laser light in red, green and blue, projected on screen with the aid of horizontal and vertical deflection units. In this paper, a primarily horizontal deflection system in the form of a rotating polygonal scanner is decribed. The design of this scanner assembly combines a double sherical air bearing with integreated polygonal mirror for deflection and a high torque inside drive for quickly reaching high rotation. The Fraunhofer institute of Applied Optics and Precision Engineering (I0IF-Jena) develops, from conception to assembled prototype, new self-acting precision bearing systems. This new scanner so lution developed out of IOF's previous developments resulting in the first ever sealed, minimal-maintenance, self-acting bearing.