Stock material or miscellaneous articles – Composite – Of bituminous or tarry residue
Patent
1989-04-20
1991-02-26
Arnold, Bruce Y.
Stock material or miscellaneous articles
Composite
Of bituminous or tarry residue
350 11, 350164, 4289088, G02B 110, G02B 528, G32B 1800, G32B 3300
Patent
active
049956841
ABSTRACT:
An impact resistant anti-reflection coating for an optical element mounted on an airborne system which mitigates damage to the optical element when the airborne system is flown through a high velocity droplet impact medium is described. In a first embodiment, the coating comprises a material having a relatively high modulus of elasticity deposited to a thickness equal to an odd multiple of a quarter of a wavelength of the wavelength radiation to be transmitted through the optical element. In accordance with a further aspect of the invention, the high modulus of elasticity layer may comprise a homogeneous mixture of a pair of high modulus elasticity materials as well as a composite layer comprising a first layer of a high modulus elasticity material and a second layer of a second modulus of elasticity material. In a second embodiment, the outer surface of an infrared material is strengthened by single diamond point turning the outer surface of the material to introduce into the surface a compressive layer. The compressive layer is characterized as having a plurality of furrows or grooves being spaced by compressed regions of material and having disposed under said furrows or grooves a compressed region of material.
REFERENCES:
patent: 2758510 (1956-08-01), Auwarter
patent: 3432225 (1969-03-01), Rock
patent: 3573023 (1971-03-01), Thomas et al.
patent: 4171400 (1979-10-01), Rosette et al.
patent: 4461750 (1984-07-01), Chess et al.
patent: 4476156 (1984-10-01), Brinker et al.
patent: 4498728 (1985-02-01), Thoni et al.
patent: 4619792 (1986-10-01), Saunders et al.
patent: 4907846 (1990-03-01), Tustison et al.
Bar and Stroud Specification Sheet No. AR25, "Advance Technical Data: Abrasion Proof High Temperature Operation", (date unknown).
J. E. Field et al; "Liquid Impact Damage Assessment for a Range of Infra-Red Materials"; Proc. 6th Int. Conf. on Erosion by Liquid and Solid Impact; Sep. 1983; pp. 21-1 to 21-13.
B. Hodgson, et al., a reprint from the Proceedings, "Diamond Turning of IR Components", SPIE, vol. 590, Infrared Technology and Applications (1985), pp. 71-76.
Table III. "Oxide Films for Optical Applications", Applied Optics, vol. 18, No. 12, Jun. 15, 1979, pp. 1972-1973.
S. Van Der Zwaag, et al., "The Effect of Double Layer Coatings of High Modulus on Contact Stresses", Philosophical Magazine A, 1986, vol. 53, No. 1, pp. 101-111.
Lussier, F., "Guide to IR-Transmissive Materials," Laser Focus, vol. 12, No. 12, Dec. 1976, pp. 47-50.
Dislich, H., et al, "Amorphous and Crystalline Dip Coatings Obtained from Organometallic Solutions: Procedures, Chemical Processes and Products," Thin Solid Films 77 (1981) 129-139.
Plasma Assisted Ion Plating Deposition of Optical Thin Films for Coatings and Integrated Optical Applications, M. Varasi, C. Mancini, P. Sartori, C. Misiano, Vacuum vol. 36, Nos. 1-3, pp. 143-147, 1986.
Compressive Thin Films for Increased Fracture Toughness, P. H. Kobrin & A. B. Harker, Rockwell International Science Center, pp. 5-9.
Impact Damage Thresholds in Brittle Materials Impacted by Water Drops, A. G. Evans, Y. M. Ito & M. Rosenblatt, 1980 American Institute of Physics, J. Appl. Phys. 51(5) May 1980.
Herstellung und Eigenschaften Von Schichten Aus Y.sub.2 O.sub.3 und Oxiden der Seltenen Erden auf Glas*, B. Frank und R. Groth, Thin Solid Films, 3(1969) 41-50-Elsevier, Lausanne.
Antisolar and Thermally Insulating Thin Films for Simple Glazings/D. Gross, Elsevier Sequoia, Sep. 18-20 1980, Thin Solid Films 77 (1981) 128.
Oxide Coatings From the Sol-Gel Process/Lisa C. Klein, Rutgers University, Ceramics Dept. Box 909 Piscataway, N.J. 08854 pp. 378-385.
Liquid Jet Impact Damage on Zinc Sulphide, S. Van Der Zwaag, J. E. Field, Dept. of Metallurgy, Journal of Material Science 17 (1982 2525-2636.
Growth of Diamond at Room Temperature by an Ion-Beam Sputter Deposition Under Hydrogen-Ion Bombardment, Makoto Kitabatake & Kiyotaka Wasa, Central Research Laboratories, J. Appl. Phys. 58(4) Aug. 15, 1985.
Structure and Properties of Quasi-Amorphous Films Prepared by Ion Beam Techniques, C. Weissmantel, K. Bewilogua, D. Dietrich, H.-J. Erler, H-J. Hinneberg, S. Klose, W. Nowick, G. Reisse//Conference on Metallurgical Coatings (1980) 19-31.
S. van der Zwaag and J. E. Field, AFWAL-TR-82-4022.
J. E. Field, S. van der Zwaag, D. Townsend and J. P. Dear, AFWAL-TR-83-4101.
diBenedetto Bernard
Montanari Dennis
Tustison Randal W.
Varitimos Thomas
Arnold Bruce Y.
Maloney Denis G.
Parsons David R.
Raytheon Company
Sharkansky Richard M.
LandOfFree
Impact resistant and tempered optical elements does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Impact resistant and tempered optical elements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impact resistant and tempered optical elements will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-290081