Catalogue No: | C0375 |
---|---|
Category: | Head-Mounted Equipment [HMD/NVG/Glasses] |
Object Type: | Module/Sub-Assembly/Component |
Object Name: | Eyepiece |
Part No: | None |
Serial No: | None |
Manufacturer: | Unknown |
Division: | Unknown |
Platform(s): | |
Year of Manufacture: | Unknown |
Dimensions: |
Width (mm): 59 Height (mm): 72 Depth (mm): 92 Weight (g): 340 |
Location: | Rack RAA15 (HMDs) [Mezzanine Store] |
None
This is an early prismatic eyepiece design probably from around the 1980’s. It was steadily refined to provide an ejection-safe Night Vision Goggle integrated within a specially designed helmet and also for the early Helmet Mounted Displays. The use of a prism allows a straight through view from the eye to the outside world but also allows an image from a CRT to be accurately superimposed over the outside world at the same focus such that the pilot sees both images as one. This system was used on the I-NIGHTS HMD for the US Navy. These early prisms were quite heavy, being solid glass, and gave a very forward centre-of-gravity.