Abstract: Provided is an optical lens having a pattern formed therein to be used as a spectacle lens, wherein the pattern can be viewed from outside while the field of vision of the wearer can be ensured without discomfort. An optical lens includes a lens substrate, an antireflection film arranged to cover the side of one principal surface of the lens substrate, and a transparent pattern formed by a light transmissive material and arranged in a position where the transparent pattern is to be laminated to the antireflection film; wherein the transparent pattern is visible when viewed from the side of the one principal surface of the lens substrate. The antireflection film has a structure formed by alternately laminating a low refractive index film and a high refractive index film. The transparent pattern is arranged between the layers of the antireflection film, or above or below the antireflection film.

Abstract: A method for producing an optical lens includes: forming a mark outside a lens region set in a lens substrate, the mark being adapted to perform position alignment; pattern-forming a masking layer above one principal surface of the lens substrate while controlling formation position of the masking layer with the mark as a reference, the masking layer having an aperture at a predetermined position in the lens region; performing a selective process with respect to a surface exposed from the bottom of the aperture of the masking layer by performing a process from above the masking layer; and removing the masking layer from above the lens substrate to form a processed pattern by the selective process on the side of the one principal surface of the lens substrate.

Abstract: A method for producing an optical lens includes: forming a mark outside a lens region set in a lens substrate, the mark being adapted to perform position alignment; pattern-forming a masking layer above one principal surface of the lens substrate while controlling formation position of the masking layer with the mark as a reference, the masking layer having an aperture at a predetermined position in the lens region; performing a selective process with respect to a surface exposed from the bottom of the aperture of the masking layer by performing a process from above the masking layer; and removing the masking layer from above the lens substrate to form a processed pattern by the selective process on the side of the one principal surface of the lens substrate.

Abstract: Provided is an optical lens having a pattern formed therein to be used as a spectacle lens, wherein the pattern can be viewed from outside while the field of vision of the wearer can be ensured without discomfort. An optical lens includes a lens substrate, an antireflection film arranged to cover the side of one principal surface of the lens substrate, and a transparent pattern formed by a light transmissive material and arranged in a position where the transparent pattern is to be laminated to the antireflection film; wherein the transparent pattern is visible when viewed from the side of the one principal surface of the lens substrate. The antireflection film has a structure formed by alternately laminating a low refractive index film and a high refractive index film. The transparent pattern is arranged between the layers of the antireflection film, or above or below the antireflection film.

Abstract: A flexible pipe connector which makes use of a pair of intermediate sleeves each having one end portion overlapped with and connected through a rubber-like elastic body to a connection pipe, each of said intermediate sleeves being coaxially arranged with the connection pipe and adapted to move in a fluid-tight manner in the axial direction thereof.