Lockheed Martin Corporation

Martin Marietta Corporation

Gary E Wiese

Gregory Anthony Harrison

David A Smith

David Alan Smith

Gene D Tener

Jennifer K Park

William H Barrow

Glenn Clark Cuddihy

G Edward Newberg

J Donald Lee

Frank Dumont

Head-mounted displays () are disclosed which include a frame (), an image display system () supported by the frame (), and a Fresnel lens system () supported by the frame (). The HMD () can employ a reflective optical surface, e.g., a free-space, ultra-wide angle, reflective optical surface (a FS/UWA/RO surface) (), supported by the frame (), with the Fresnel lens system () being located between the image display system () and the reflective optical surface (). The Fresnel lens system () can include at least one curved Fresnel lens element (). Fresnel lens elements () for use in HMDs are also disclosed which have facets () separated by edges () which lie along radial lines () which during use of the HMD pass through a center of rotation () of a nominal user's eye () or through the center of the eye's lens () or are normal to the surface of the eye's cornea.

Head-mounted display apparatus employing one or more fresnel lenses

Computer-based methods and associated computer systems are disclosed for designing free space reflective optical surfaces () for use in head-mounted displays (HMDs). The reflective optical surface () produces a virtual image of a display surface () for viewing by a user's eye (). The method includes using one or more computers to: (i) represent the display surface () by display objects (); (ii) represent the free space reflective optical surface () by surface elements (); and (iii) iteratively calculate spatial locations, normals, and radii of curvature for the surface elements () which will cause a virtual image of each display object () to be displayed to a nominal user's eye () in a desired direction of gaze of the eye ().

Methods and systems for creating free space reflective optical surfaces

Head-mounted displays () are disclosed which include a frame (), an image display system () supported by the frame (), and a reflective surface, e.g., a free-space, ultra-wide angle, reflective optical surface (a FS/UWA/RO surface) (), supported by the frame (). In certain embodiments, the reflective surface () produces spatially-separated virtual images that are angularly separated by at least 100, 150, or 200 degrees. Methods and apparatus for designing reflective optical surfaces, including FS/UWA/RO surfaces, for use in head-mounted displays () are also disclosed.

Head-mounted display apparatus employing one or more reflective optical surfaces

An apparatus combining an optical sensor and a bomb impact assessment system, and corresponding method for facilitating bomb impact assessment, comprising means for receiving an optical signal, means for splitting off a portion of the optical signal from a primary optical path to form a secondary optical path, a lens in the secondary optical path, the lens comprising a plurality of facets generating a plurality of tertiary optical paths, means for combining signals from the primary and one or more of the tertiary optical paths, means for detecting the combined signals, and means for projecting onto a focal plane array bomb impact assessment data comprising detected signals from one or more of the tertiary optical paths.

Bomb impact assessment using forward looking infrared sensor

Refractive optical systems having first and second lens systems are transmissive to infrared radiation. The first lens system includes one of BaFand CaF. An exemplary second lens system includes an optical material selected from at least spinel, MgF, and aluminum oxynitride. Such exemplary refractive optical systems provide correction of chromatic aberration in multiple wavelength bands.

Refractive multispectral objective lens system and methods of selecting optical materials therefor

In a method for boresighting an infrared search and track sensor to an inertial reference frame provided by a boresight module, a collimated image of a reticle pattern of the boresight module is projected. The projected image is scanned with the sensor to obtain a scanned image. Rotation of the scanned image due to boresight module roll and distortion of the scanned image due to sensor roll are isolated. Distortion of the scanned image due to sensor roll is removed. An arrangement in an infrared search and track sensor is also disclosed.

Method and apparatus for correcting infrared search and track system

In a forward looking infrared (FLIR) sensor, a scanning mirror views an external scene, and the infrared energy from the scanning mirror is directed along an optical path to a solid state detector. In the optical path there is a three-position mirror which is driven by an actuator to three predetermined positions. The FLIR sensor also includes two thermal reference sources which are disposed on either side of the optical path and viewable by the three-position mirror. When in a neutral position the three-position mirror reflects the infrared energy from the external scene onto the detector. When the three-position mirror is moved away from the neutral position to two different predetermined positions, the three-position mirror views each of the thermal reference sources and reflects the thermal energy of the thermal reference sources onto the detector in order to provide two reference irradiance levels for the FLIR sensor.

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Orlando, FL, United States of America

Gary E Wiese