Patent ID: 7954965
Filing Date: 2011-06-07
Classification: G01D

Abstract:
1. A display for measured quantities comprising: a gauge with a set of indicia spaced around the gauge to indicate the measured quantities; a window in the gauge extending along the set of indicia; an elliptical reflector positioned such that a first foci of the reflector is on the same axis as a center of the gauge; an optical device mounted on a shaft, the optical device being arranged to redirect a light beam from a second foci of the elliptical reflector onto the elliptical reflector to generate a virtual pointer in the window; a means for turning the shaft to rotate the optical device; a light source for projecting the light beam onto the optical device, rotation of the optical device enabling the virtual pointer to be selectively aimed at the set of indicia; and a controller responsive to the measured quantity to repeatedly turn the light source on at one or more selected scan positions of the optical device such that the position of the virtual pointer in the window is a representation of the current value of the measured quantity.