Light shielding lens

Abstract

Abstract PURPOSE:To permit ultraviolet rays to pass through and to prevent dazzle of visible rays by immersing a synthetic resin lens in a blue color disperse dyeing solution to dye it and successively laminating a high-refractive index film and a low-refractive index film with a specific optical thickness to form a coating film. CONSTITUTION:A synthetic resin lens obtained by polymerizing a monomer essentially consisting of a diethylene glycol bisaryl-carbonate is used, and this lens is immersed in a blue dye dispersed solution and is dyed. A high-refractive index material and a low-refractive index material are alternately vapor- deposited on the surface of the plastic lens so that their optical thickness is (2m+1)/4 where (m) is 0 or 1 (430nm<=lambda<=500hnm). That is, ultraviolet rays having about 320-400nm wavelength are permitted to pass through and rays having about 410-480nm wavelength are intercepted for the purpose of a light shielding lens which permits ultraviolet rays causing sunburn and snow-tanning to pass through but reflects dazzle light of visible rays, and further, the transmittance curve is approximately flatly changed near 500-620nm wavelength to obtain the light shielding lens having well color balance.

Inventors

• 👤 Yoshiyasu Koyama
• 👤 小山　賀尉

Bibliographic Details