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Proceedings Paper

Rugate filters for image projection in head-mounted displays
Author(s): John Allen; Peter G. Girow; B. Herrington; P. Gee
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Paper Abstract

In recent years there has been increasing interest in helmet or head mounted displays in military aircraft as a method of supplying information to the pilot additional to that supplied by the Head-up Display. Although a number of these are already in service, primarily as night vision systems, prototype demonstrators are currently being developed where information from more than one display must be combined with the view of the outside world. The paper describes the design and manufacturing techniques used to create a thin film rugate filter for the combining surface of a head mounted display operating close to the pilot's eyes. As the weight of head mounted devices is of paramount importance, both lightweight glass and plastic elements have been used as substrates. The problems of coating plastic optics are discussed and methods to overcome some of these difficulties particularly when extrapolated for rugate filters are described. The properties of manufactured coatings on each substrate type are compared and the results presented.

Paper Details

Date Published: 4 November 1994
PDF: 6 pages
Proc. SPIE 2253, Optical Interference Coatings, (4 November 1994); doi: 10.1117/12.192122
Show Author Affiliations
John Allen, Omitec Thin Films Ltd. (United Kingdom)
Peter G. Girow, Omitec Thin Films Ltd. (United Kingdom)
B. Herrington, Omitec Thin Films Ltd. (United Kingdom)
P. Gee, Omitec Thin Films Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 2253:
Optical Interference Coatings
Florin Abeles, Editor(s)

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