Pilkington Pe Limited

Anthony John Kirkham

David Gordon Norrie

Martin D Roberts

A dual field-of-view objective system ( ) which is inexpensive, has high transmission and is essentially achromatized and athermalized. The system ( ) uses a silicon front lens A and all lens elements have positive temperature/refractive index change coefficient.

Dual field-of-view objects system for the infrared

An optical system for a display having a combiner (1) with a non-conformal reflection hologram and in which an intermediate image (II) of a display source is formed at a location in the light path to and spaced from the combiner (1), the system comprising at least one diffractive element (5,7) disposed in the light path between the display source (2) and the intermediate image (II) and arranged to counter, at least partially, the chromatic dispersion of the non-conformal reflection hologram (1).

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St. Asaph, United Kingdom

Anthony John Kirkham