Optics: measuring and testing – Range or remote distance finding – Triangulation ranging to a point with one projected beam
Patent
1997-05-19
1999-03-02
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
Triangulation ranging to a point with one projected beam
396113, G01C 0308
Patent
active
058778500
ABSTRACT:
The overall length of a lens, particularly the thickness thereof, is reduced to thereby reduce the volumetric capacity occupied by a lens system for distance measurement. A distance measuring apparatus has a light-emitting device; a light-projecting lens system for projecting light emitted from the light-emitting device onto a subject; a light-receiving lens system for receiving and converging reflected light from the subject; and a detector for detecting the light. The light-projecting lens system or the light-receiving lens system includes a diffractive optical element having plane surfaces r.sub.1 and r.sub.4 on both sides thereof, at least one of which is formed from a diffraction surface. A similar diffractive optical element is provided in a similar lens system adapted to change a projected light angle by adding a converter lens to a master lens, and also provided in a similar lens system adapted to change a projected light angle by changing the spacing between a plurality of lens units.
REFERENCES:
patent: 5239335 (1993-08-01), Kato
patent: 5313262 (1994-05-01), Leonard
patent: 5589930 (1996-12-01), Kurahashi et al.
patent: 5737070 (1998-04-01), Kato
Applied Optics/vol.28, No. 18/15 Sep. 1989 Design Of A Wide Field Diffractive Landscape Lens, Dale A. Buralli et al, pp. 3950-3959.
Applied Optics/ vol. 27, No. 14/15 Jul. 1988 Hybrid Diffractive-Refractive Lenses And Achromats, Thomas Sone et al, pp.,2960 -2971.
Hellner Mark
Olympus Optical Company, Ltd
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