Optical system for head-up displays

Details Optical system for head-up displays Optical system for head-up displays

1988-08-12

1990-05-22

Arnold, Bruce Y.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

350171, 340705, G02B 2710

Patent

active

049272349

ABSTRACT:
An optical system for a head-up display for example for producing a collimated image of a crt display on the external view of an aircraft pilot includes an optical relay unit including two elements (11,12) to produce a double fold in its optical axis to reduce the physical size of the relay unit. One of the two units (11), preferably of a diffractive type, is adapted to transmit light of the display color at a first angle of incidence and to reflect such light at a second angle of incidence.
By use of a diffractive element having a narrow band reflectance, the system is extended to include embodiments for combining the display of two different color displays and a full color version using three crts is described.

REFERENCES:
patent: 2669902 (1954-02-01), Barnes
patent: 3443105 (1969-05-01), Scidmore et al.
patent: 4407564 (1983-10-01), Ellis
patent: 4592620 (1986-06-01), Poole
patent: 4611877 (1986-09-01), Ellis
patent: 4697879 (1987-10-01), Gerbe
patent: 4714320 (1987-12-01), Banbury
patent: 4793687 (1988-12-01), Shenker et al.

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