Various embodiments provide a method for fabricating a couplable electro-optical device. In an example embodiment, the method includes fabricating at least one raw electro-optical device on a substrate; applying lens material to a working stamp; aligning the substrate and the working stamp; pressing the substrate onto the lens material until the distance between the substrate and the working stamp is a predetermined distance; and curing the lens material to form an integrated lens secured to the at least one electro-optical device on the substrate. An anti-reflective coating layer may be optionally applied on top of the molded lens. The couplable electro-optical device may be incorporated into a receiver, transmitter, and/or transceiver using passive alignment to align the couplable electro-optical device to an optical fiber.

A lens assembly and an electronic device including the same are provided. The lens assembly includes a lens group. A lens that is in the lens group and that is close to an object side has a convex surface, and the convex surface protrudes from a shoulder of a lens tube. A head of the lens assembly may be reduced without affecting a maximum field of view of the lens assembly, so that the head of the lens assembly tends to be miniaturized. Therefore, a size of a hole provided on a display screen is reduced. Thus, a screen-to-body ratio of the display screen is improved.

A polythiol composition includes a polythiol compound (A) including at least one of 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, or 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and a polythiol compound (B) that is 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane.

A polythiol composition includes a polythiol compound (A) including at least one of 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, or 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and a polythiol compound (B) that is 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane.

A lens device includes a lens including an optical unit, and a rib portion extending outwardly of the optical unit in a radial direction, where the rib portion includes a light transmission region and a light blocking region, and where the light blocking region is disposed inside of the rib portion. The light blocking region may include a non-polar colorant. The lens may include a cyclic olefin compound. The lens device may include one or more lenses with rib portions with light transmission regions and light blocking regions, and may be a lens assembly with the one or more lenses.

A lens device includes a lens including an optical unit, and a rib portion extending outwardly of the optical unit in a radial direction, where the rib portion includes a light transmission region and a light blocking region, and where the light blocking region is disposed inside of the rib portion. The light blocking region may include a non-polar colorant. The lens may include a cyclic olefin compound. The lens device may include one or more lenses with rib portions with light transmission regions and light blocking regions, and may be a lens assembly with the one or more lenses.

Provided is a benzotriazole compound represented by Formula (1). In Formula (1), R.sub.1 to R.sub.4 represent substituents. In Formula (1), n1 represents an integer from 0 to 4, and n2 represents an integer from 0 to 3.

Provided is a benzotriazole compound represented by Formula (1). In Formula (1), R.sub.1 to R.sub.4 represent substituents. In Formula (1), n1 represents an integer from 0 to 4, and n2 represents an integer from 0 to 3.

The present disclosure relates to a method for producing an optical element, for example a lens, for example a headlight lens, for example for vehicle headlights or motor vehicle headlights, wherein an optical component part having an (optically effective) convex surface made of a first transparent optical material is provided and/or produced; a mold having a concave cavity and optical material is provided and/or produced; liquid transparent second optical material is placed into the concave cavity of the mold; and the optical component part having the convexly curved surface is pressed into the concave cavity of the mold such that an optically effective coating is formed on the convexly curved surface.

A two-color molding die includes: a fixed primary die; a fixed secondary die; and a movable die. The fixed primary die includes a first concave portion. The movable die includes a second concave portion facing the first concave portion, and a core pin that protrudes from a base end surface of the second concave portion toward a base end surface of the first concave portion to form a tubular primary molding cavity between the core pin and the first concave portion and the second concave portion. The fixed secondary die includes a third concave portion configured to form a concave secondary molding cavity.