|Category:||Head-Up Display [HUD]|
|Object Name:||F-22 HUD Diffractive Combiner Assembly|
|Part No:||K6111 062561|
|Year of Manufacture:||Unknown|
|Location:||Archive Object Store|
In 1981, the U.S. Air Force developed a requirement for an Advanced Tactical Fighter (ATF) as a new air superiority fighter to replace the F-15 and F-16. In April 1991, the Lockheed MartinYF-22 was announced as the winner of the ATF competition. The production F-22 model was unveiled in April 1997 at Lockheed Georgia Co. and first flew in September 1997. Production deliveries commenced in 2003.
During 1986 the Company research team (FARL) were beginning to make significant achievements on the use of Computer Generated Holograms (CGH) for HUD optics. A theoretical design showed the feasibility of a design with a 35o off-axis angle being capable of installation in the F-16 envelope. Additional benefits were Combiner transmission of 80% and optical system end to end transmission of 40% compared to 20% on the conventional F-16C/D desin resulting in a much brighter display. This work involved collabor4ation between FARL, ADD and the Hirst Research Centre at Wembley and Marconi Research Centre at Great Baddow who provided the CGH and Hologram manufacturing facilities respectively. By 1989 this design was targeted at the proposals for EFA (European Fighter Aircraft ultimately to be the Typhoon) and also for the ATF (Advanced Tactical Fighter ultimately to be the F-22). ADD had begun the fabrication of a demonstrator which was completed by the end of 1991. This demonstrator consisted of a complex optical system containing tilted and de-centered lenses, aspheric components and a single holographic Combiner designed with the aid of CGH. The ‘double bounce fold ‘ arrangement was novel and was patented.
In 1991 the Company was selected to provide a cursive only variant of this design for the Advanced Tactical Fighter which became the USAF F-22 Raptor. The HUD order for 400 systems was part of a £300M package which also included the Pilot’s Control Stick and the integrated Vehicle Management System.
The glass has a circular blemish like a bubble on it and is therefore scrap.