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Ablenkeinrichtung fuer eine Projektionsvorrichtung, Projektionsvorrichtung zum Projizieren eines Bildes und Verfahren zum Ansteuern einer Ablenkeinrichtung fuer eine Projektionsvorrichtung

Deflecting system for deflecting light radiation for producing lissajous figure projected by projection device in observation field, has control circuit controlling control frequencies depending on measured oscillation phase shift
 
: Hofmann, U.; Ratzmann, L.; Janes, J.; Weiss, M.; Mühlmann, S.

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DE 102009058762 A: 20091214
DE 102009058762 A: 20091214
G02B0026
G02B0027
Deutsch
Patent, Elektronische Publikation
Fraunhofer ISIT ()

Abstract
DE 102009058762 A1 UPAB: 20110705 NOVELTY - The system (30) has a deflecting unit for producing oscillation around deflection axes, and a control device (32) for producing control signals for the deflecting unit with control frequencies corresponding to resonant frequencies of the deflecting unit. The control device comprises a control circuit (34) for controlling the control frequencies depending on measured phase shift of oscillation of the deflecting unit such that maximum amplitude of the oscillations remains in resonance range of the deflecting unit. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a projection device for projecting an image on an image field (2) a method for controlling a deflecting system for a projection device. USE - Deflecting system for deflecting light radiation around deflection axes for producing a lissajous figure that is projected by a projection device in an observation field (all claimed). ADVANTAGE - The control circuit controls the control frequencies depending on measured phase shift of oscillation of the deflecting unit such that the maximum amplitude of the oscillation remains in the resonance range of the deflecting unit, thus achieving increased scanning and/or deflecting frequency and providing increased Theta Digital product. The deflecting unit has quality factor greater than 3,000.

: http://publica.fraunhofer.de/dokumente/N-174773.html