Helmet Mounted Display Optical Design.
Abstract
The work performed under Phase II of this contract included the final design and fabrication of the two optical systems chosen as a result of Phase I of this program. These were: (1) Off-aperture Concave Mirror Magnifier Eyepiece -- 'Toroidal Mirror', and (2) Off-aperture Concave Mirror Eyepiece Erecting Eyepiece. Both systems were manufactured with totally reflecting eyepiece mirrors eliminating the cost of the second surface at this time. For the same reason, minimum mounts only suitable for optical testing were supplied. To permit the use of one common CRT for use with either instrument, both systems were designed to be used with a 28.3mm x 28.3mm (40mm 0) format to approach as close as possible the desired 40 deg x 40 deg apparent field of view. This was more than enough for the Off-aperture Concave Mirror Eyepiece Erecting Eyepiece System (which could be designed to work with a significantly smaller tube) and gave the desired 40 deg vertical field when used with the toroidal mirror; however, the horizontal field was limited to approximately 32 deg. Results of this study show that the desired horizontal field can only be achieved at the expense of further reduction in image quality when the system is off-aperture or off-axis in the horizontal direction.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1974
- Accession Number
- ADA098154