A lens includes a cover part and an interposing member formed of a light-reflecting material. The cover part includes a lens part having a lateral side, a connection part constituting a lateral side wall extending from the lateral side, and a flange part having a lower surface disposed below the lateral side wall. The interposing member has an upper surface and an inner lateral surface. The upper surface is disposed on the lower surface of the flange part. The lens part and the interposing member define a recess having an opening facing downward. The lens part defines a bottom surface of the recess. The inner lateral surface defines a lateral surface of the recess, which defines the opening of the recess. The flange part extends outward from the opening. The lens part has a convex lens and a light-emitting surface with projections outward from the convex lens.

Provided is a curable composition capable of giving a lens that has excellent transfer accuracy from a mold and offers heat resistance and optical properties at excellent levels. The curable composition according to the present invention for lens formation contains a cycloaliphatic epoxide (A) represented by Formula (a), a cationic-polymerization initiator (B), and a polysiloxane (C) represented by Formula (c). The curable composition contains the polysiloxane (C) in an amount of 0.01% to 5% by weight based on the total amount of the curable composition. The curable composition according to the present invention for lens formation may further contain a siloxane compound (D) containing two or more epoxy groups per molecule.

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A method and an apparatus for producing a relief-pattern forming, the method and apparatus being suitable for producing a film-like material, such as an embossed film, having a fine relief-structure pattern formed on a surface thereof so as to have a distinctive optical effect with higher quality, good productivity, and fewer defects. A transfer pattern printed layer having an inverted structure of a relief-structure pattern is formed on a second substrate by printing a transfer pattern onto the surface of a first substrate on which the relief-structure pattern is formed at a predetermined position by registration with the relief-structure pattern followed by drying, laminating with the second substrate, curing and peeling.

A nanoimprint liquid material in which the particle number concentration of particles having a particle diameter of 0.07 m or more is less than 310/mL is provided.

The invention relates to a surface structure and a Fresnel lens which has at least one such surface structure. Furthermore, the invention relates to a tool for production of a surface structure and a method for production of a surface structure or Fresnel lens. Furthermore, the invention relates to the use of a Fresnel lens.

There is provided a lens including a first curved surface and a second curved surface. The first curved surface and the second curved surface have different focal distances and are arranged interlacedly along a radial direction of the lens.

The invention provides a method for producing embedded contact lenses involving steps of use of a set of 3 mold halves in two-curing steps. One of the 3 mold halves have been used twice, the first time for molding an insert and the second time for molding the embedded hydrogel contact lens. The twice-used mold half has been treated with a corona plasma or a vacuum UV in a central circular area of its molding surface having a diameter equal to or smaller than the diameter of the insert to ensure that the molded insert consistently adhered to the twice-used mold half. The method also comprises a step of forming a reactive polysiloxane coating that is covalently attached onto the back or front surface of a molded insert adhered on the twice-used mold half before molding the embedded contact lens in the 2.sup.nd curing step.

The invention provides a method for producing embedded diffractive contact lenses involving use of a mold set in two-curing steps. The mold set consists of three mold halves, one of which is used twice, the first time for molding a diffractive insert and the second time for an embedded contact lens with the molded diffractive insert embedded therein. The twice-used mold half has been treated with a corona plasma or a vacuum UV in a central circular area having a diameter equal to or smaller than the diameter of the insert to ensure that the molded insert consistently adheres to the twice-used mold half, even though the other mating insert mold half for molding the diffractive insert has a great tendency to bind strongly the molded insert due to the diffractive structure on its molding surface.

The invention provides a method for producing embedded contact lenses involving a mold set in a two-curing-step process and a fast-curing SiHy lens formulation. The mold set consists of three mold halves, one of which is used twice, the first time for molding an insert from an insert-forming composition and the second time for an embedded contact lens with the molded insert embedded therein from the fast curing SiHy lens formulation that comprises a N,N-dialkylacrylamide, a hydrophilic (meth)acrylamido monomer, and a polysiloxane vinylic crosslinker and being free of any siloxane-containing vinylic monomer.

The invention provides a method for producing delamination-resistant embedded contact lenses involving use of a mold set in two-curing steps and a special lens-forming composition for forming a bulk hydrogel material for embedding a crosslinked polymeric insert. The mold set consists of three mold halves, one of which is used twice, the first time for molding an insert from an insert-forming composition and the second time for an embedded contact lens with the molded insert embedded therein from the special lens-forming composition that a vinylic crosslinking agent and or organic solvent both of which independent of each other can swell an insert by a moderate swelling degree. The resultant embedded hydrogel contact lenses can be free of deformation and delamination.