Display collimator system including a standby reticle arrangement

Claim 1

A collimator system for a head-up display comprising: a device for displaying luminous objects on the screen of a cathode-ray tube; an optical collimator assembly to project an image of said objects to infinity; a semi-transparent combining glass to allow the image to be viewed superimposed on the external surroundings; and a standby reticle arrangement comprising: at least one reticle disposed laterally to the tube; dichroic mirror means for transmitting to the optical assembly radiation coming from said screen of said tube and that coming from said standby reticle arrangement; a power supply for supplying said standby reticle arrangement; and control means for selectively powering portions of said reticle arrangement to produce a corresponding reticle image which is moveable in a predetermined direction, said reticle arrangement being entirely static, and including a plurality of n elements which are juxaposed corresponding to said direction, said control means comprising a switch device having n positions coupling said supply to said n elements separately, each such element being of one and the same common shape representing a portion of said reticle to be projected, and each position of said switch corresponding to a predetermined position for said moveable image of said reticle in said shift direction.