Patent ID: 9568738
Date: 2017-02-14
CPC Classifications: G02B

Claim:
1. An optical device, comprising: a light-transmitting substrate having an input aperture and at least first and second major surfaces parallel to each other and edges; at least one partially reflecting surface located in the substrate and oriented at an off-axis angle with respect to a normal to the major surfaces of the substrate; optical means including at least one reflecting surface for coupling light waves from a display source into the substrate, by total internal reflection; and at least one imaging lens, having at least two surfaces, wherein the reflecting surface is oriented at an angle to the major surfaces of the substrate, such that directions of the light waves impinging on the reflecting surface are changed, so that the light waves are trapped inside the substrate by total internal reflection, and the reflecting surface is located outside the substrate, is not between the planes of the two major surfaces of the substrate, and is not parallel to any of the major surfaces or edges of the substrate.