Cemented lens and process for production thereof
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorsYosio Kamekura, Masanao Kawahara
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Abstract
A cemented lens consists of a lens that is tinted and/or contains a UV absorber, and a second lens that is neither tinted nor contains any UV absorber. The cemented lens is formed by placing the two lens elements together with a UV-curable adhesive between them, and then directing UV radiation through the first lens to cure the adhesive.
Claims25
A cemented lens, consisting of a first lens element that contains a UV absorber and a second lens element that does not contain a UV absorber.
A process for producing a cemented lens, comprising the steps of applying a UV-curable adhesive onto mating surfaces of a first lens element containing a UV absorber and a second lens element not containing a UV absorber, assembling the two lens elements and applying UV radiation to the assembly through the second lens element.
A process for producing a cemented lens, comprising the steps of applying a UV-curable adhesive onto mating surfaces of a tinted lens element, which contains a UV absorber and an untinted lens element, which does not contain a UV absorber, assembling the two lens elements and applying UV radiation to the assembly through the untinted lens element.
A cemented lens comprising:
- a first lens located on a user's eye side of the cemented lens, said first lens comprising polycarbonate resin or polyurethane resin;
- and
- a second lens located on an object side of the cemented lens, said front lens comprising a synthetic resin having a refractive index different from a refractive index of said rear lens, wherein only one of said first and second lenses contains a UV absorber.
Dependencies are inferred from the claim text.