| 摘要 |
PCT No. PCT/EP90/02064 Sec. 371 Date May 26, 1992 Sec. 102(e) Date May 26, 1992 PCT Filed Nov. 30, 1990 PCT Pub. No. WO91/08504 PCT Pub. Date Jun. 13, 1991.In an optical positioning system for at least two picture elements, a wavelength-dispersive, first light-deflecting element is used which deflects light beams in a first deflection direction according to their wavelength. In order to enhance the positioning speed, the optical system comprises two narrow-band light sources with a controllable wavelength for every picture element. The first light-deflecting element is arranged in the beam path of a second light-deflecting element with which an additional, essentially wavelength-independent deflection can be implemented. The range of deflection of the first light-deflecting element is thereby noticeably smaller than that of the second light-deflecting element. The ray beams of the light sources charge or impinge upon the wavelength-dispersive element in common. By setting the wavelength of each light source, each of the picture elements simultaneously receives a desired image position in the range of deflection of the second light-deflecting element around the basic position prescribed by it.
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