Abstract
Up to now, Microdisplays are mainly used in multimedia applications or
head-mounted displays. Due to their interesting properties, these displays
open more and more alternative application fields, for example, in optical
metrology. Projection lenses for this application area have to be specially
designed, because the requirements for these systems differ completely from
those for multimedia applications. The lenses must have very low geometrical
image distortion and they have to be adapted to small objects and/or image
distances. On the other hand, they often work with light sources with small
spectral bandwidths; consequently they do not need to be corrected for
chromatic aberrations. In addition, the numerical aperture (NA) has to be
large enough to collect and transfer as much light as possible. Secondary
the size of the projection lens has to be as small as possible to ensure
compact measurement systems. All these requirements lead to a compromise in
optical lens and system design.Within this paper, the development and realization of a 3D-scanner for the
registration of dental surfaces directly inside the patient's mouth is
presented. The advantages of such an intraoral scanning system are the
reduced pain level for the patient and the absence of extensive intermediate
steps. The production of prosthesis can be performed directly after
measurement. Thus a quality improvement can be obtained as well as a
reduction of the efforts in time and costs.
© 2011 IEEE
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