Lamp with protective coating and method of applying same
First Claim
1. A lamp having a light-transmitting envelope and an optically clear protective coating on the exterior surface of said envelope, said coating comprising a solvent-free photopolymer in combination with reinforcing fibers dispersed throughout said photopolymer coating, the lengths of said fibers being between about the length of the maximum dimension of said lamp envelope and 1/16 inch, and said photopolymer comprising a UV curable synthetic polymer containing an organic photoinitiator or photosensitizer and which has been rapidly cured by irradiation with a source of ultraviolet light for a period between about 0.1 second and 10 seconds, whereby a smooth coating surface is provided with minimized protrusion of fibers.
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Accused Products
Abstract
A photoflash lamp having a glass envelope with a clear protective exterior coating comprising a photopolymer reinforced with glass fibers. In applying the coating, a long strand of glass fibers is wrapped about the lamp envelope, which is then dipped in a liquid photopolymer, or short lengths of glass fiber are dispersed throughout the liquid photopolymer, either by premixing or application after dipping. The wet-coated lamp is then cure-hardened by a short period of irradiation with a source of ultraviolet light.
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Citations
9 Claims
- 1. A lamp having a light-transmitting envelope and an optically clear protective coating on the exterior surface of said envelope, said coating comprising a solvent-free photopolymer in combination with reinforcing fibers dispersed throughout said photopolymer coating, the lengths of said fibers being between about the length of the maximum dimension of said lamp envelope and 1/16 inch, and said photopolymer comprising a UV curable synthetic polymer containing an organic photoinitiator or photosensitizer and which has been rapidly cured by irradiation with a source of ultraviolet light for a period between about 0.1 second and 10 seconds, whereby a smooth coating surface is provided with minimized protrusion of fibers.
Specification