APERTURE MULTIPLIER USING A RECTANGULAR WAVEGUIDE Russian patent published in 2021 - IPC G02B27/14 G02B6/10 

FIELD: optical aperture multipliers.

SUBSTANCE: invention relates to optical aperture multipliers, in particular to an optical aperture multiplier that contains a rectangular waveguide, as well as display devices for displaying an image near the eye and display devices for displaying an image on the windshield, which use such aperture multipliers. The claimed optical aperture multiplier contains: a first optical waveguide having an elongation direction and having the first and second pairs of parallel walls forming a rectangular cross-section in which a set of partially reflecting surfaces at least partially cross the first optical waveguide, the above-mentioned partially reflecting surfaces being at an oblique angle to the elongation direction, and a second optical waveguide optically connected to the first optical waveguide and having a third pair of parallel walls forming a planar waveguide. And the set of partially reflecting surfaces at least partially cross the second optical waveguide, while these partially reflecting surfaces are at an oblique angle to the third pair of parallel walls. The specified optical coupling and the specified partially reflecting surfaces of the specified first and second waveguides are designed in such a way that when the image enters the specified first optical waveguide with the initial direction of propagation at the interface angle, which is inclined to both the first and second pairs of parallel walls, it moves due to four-fold internal reflection along the specified first optical waveguide with a fraction of the image intensity reflected from the specified partially reflecting surfaces, so that it is output to the specified second optical waveguide and propagated by double reflection in the specified second optical waveguide, with a fraction of the intensity of the image reflected from the specified partially reflecting surfaces so that it is directed outward from one of the specified parallel walls as a visible image.

EFFECT: technical result is the creation of a compact device with a large aperture.

24 cl, 35 dwg