Optical projectors for head-up displays

Details Optical projectors for head-up displays Optical projectors for head-up displays

1987-11-25

1989-05-23

Corbin, John K.

350169, 350286, G02B 2714

Patent

active

048324493

ABSTRACT:
An optical projector (11) for a two-color head-up display wherein light of a first color from a first data source (15) passes through a first lens arrangement (23) into a first wedge-shaped body (27) wherein the light is, in turn, internally reflected at first and second angled faces (35 and 33) of the body and then exits the body at the first face (35) to pass via a second lens arrangement (25) to the system combiner (13) in a direction at an angle to that which light enters the body, and light of a second color from a second data source (37) passes through a third lens arrangement (41) into a second wedge-shaped body (43) wherein the light is reflected at one (49) of first and second angled faces (47, 49) of the second body and then exits the body at the other angled face (47), which is adjacent the second angled face of the first body, and then passes through the first body to the second lens arrangement, there being a dichroic coating at the interface of the two bodies to effect reflection of light of the first color but allow transmission of light of the second color, and the light paths for light for the two colors being of equal length. The arrangement of the projector facilitates the projector having lateral dimensions dictated by the data sources (e.g. CRTs) rather than the optical elements of the projector.

REFERENCES:
patent: 1497357 (1924-06-01), Comstock
patent: 1862950 (1932-06-01), Ball
patent: 1910492 (1933-05-01), Mellor
patent: 3987299 (1976-10-01), Mulder
patent: 4714320 (1987-12-01), Banbury

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