Pilkington Pe Limited

David W Swift

A relatively simple dual display system, e.g. a map or stand-by graticule superimposed on a radar or main display, is provided by use of holography. A holographic element when illuminated with a reconstruction beam from a light source provides a holographic image of visual information at a postiion behind and spaced from the element itself. The element is mounted an appropriate distance in front of a cathode ray tube such that the holographic image appears at the phosphor surface superimposed on and coincident with the CRT display.

Optical display apparatus

In a head-up display system by which visual information from a display is superimposed by means of a combiner on a pilot's view of the outside scene, the pilot's view is recorded by a head mounted camera to which light from the outside scene and superimposed display is reflected by a head-mounted mirror. The arrangement is particularly useful for pilot training purposes.

Head-up displays

Low light level or night vision apparatus, and particularly goggles, having an objective lens to focus incident light on to an image intensifier and a magnifier enabling an observer to view a magnified version of the intensified image includes a wavelength selective filter with a hole or aperture through which light of other wavelengths can pass, the wavelength selective filter or means associated with the hole or aperture being arranged to have a focussing effect so that light from a distant scene or object of a wavelength passed by the filter can be properly focussed on the image intensifier, and light from a near scene or object passing through the hole or aperture can simultaneously also be properly focussed on the image intensifier, so that either or both images can be viewed in a focussed condition without adjustment of the apparatus.

Low light level vision apparatus

This invention provides a head up display apparatus particularly for use by the pilot of an aircraft including a cathode ray tube to display visual information to the pilot, means for mounting the cathode ray tube on the head of the pilot and a combiner also mounted on the pilot's head to superimpose an image of the displayed information on the pilots view. The apparatus includes a visual information relay system with a visual information source and display means arranged to view the visual information source and operatively connected with the cathode ray tube to display the visual information so viewed. The relay system includes a component arranged to be mounted at a fixed position and a component arranged to be mounted on the pilot's head so that a change of angular position of the pilots head produces a change of position of the visual information relative to the display means and a corresponding change of position of the display of the information on the cathode ray tube.

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Prestatyn, United Kingdom

David W Swift