A Stable Optical Structure For Hard Copy Displays

Warren H. Miller Jr.

doi:10.1117/12.955772

20 January 1978 A Stable Optical Structure For Hard Copy Displays

Warren H. Miller Jr.

Proceedings Volume 0121, Optics in Adverse Environments I; (1978) https://doi.org/10.1117/12.955772
Event: 21st Annual Technical Symposium, 1977, San Diego, United States

Abstract

Shock, vibration, and large ambient temperature excursions changed the optical packaging of a Hard Copy Display from routine to challenging. This rugged, precise facsimile was designed or a military application, utilizing a CRT imaged 1:1 onto a wet processed film. The requirement that the equipment meet MIL-E-16400 necessitated such machine specifications as: less than 10 percent jitter of a 1.2 mil spot over a 48-inch path length in a 1/2 g vibration field, while holding ±0.001 inch depth of focus over a temperature range of 1000 F. The initial design reflected a ruggedized version of an office-environment piece of similar equipment, but analysis revealed that it could not survive the shock forces, that the rack temperature would have to be closely controlled, and that severe constraints were put on the CRT specifications. The final design concept makes use of several unusual techniques to meet all specifications. Certain major structural components are made of aramid fiber/epoxy composite, the folding mirrors are mounted on flexures, and the CRT is mounted in a form-fitting housing. The layout geometry balances thermal expansions of components tending to increase the optical path against thermal expansion of components tending to decrease the optical path, while utilizing the dimensional invariance of the aramid/epoxy composite structure. Certain problems arising in the implementation of this design are discussed, along with their solutions. The equipment has been functioning satisfactorily in the field for 3 years.

Citation Download Citation

Warren H. Miller Jr. "A Stable Optical Structure For Hard Copy Displays", Proc. SPIE 0121, Optics in Adverse Environments I, (20 January 1978); https://doi.org/10.1117/12.955772

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