Transparency holder for navigation aid

Details Transparency holder for navigation aid Transparency holder for navigation aid

G - Physics

02

B

G02B 27/02 (2006.01) G01C 21/04 (2006.01) G01C 21/20 (2006.01) G09B 29/10 (2006.01)

Patent

CA 2189800

A transparency holder for use in a navigation device is disclosed. The transparency holder is positioned between a lens and a compass, and is adapted to receive a map transparency in one correct orientation only. The one orientation only feature is achieved by providing certain asymmetric features, such as off-center notches which engage complementary features in the navigation device. In the preferred embodiments, the transparency holder has integral upper and lower halves hinged together by a living hinge and sandswitching the map transparency therebetween.

Porte-transparent utilisable pour la navigation. Ce porte-transparent, que l'on insère entre une lentille et une boussole, est conçu pour recevoir un transparent de carte selon une seule orientation. Cette caractéristique de ne présenter qu'une seule bonne orientation est obtenue grâce à certaines caractéristiques d'asymétrie, comme des encoches décentrées pouvant s'engager dans les contours complémentaires du dispositif de navigation. Dans les configurations préférées de ce porte-transparent, il comporte des sections supérieure et inférieure intégralement articulées entre elles par une charnière mobile et entre lesquelles on intercale le transparent de carte.

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