An optical imaging lens, including a first lens element and a second lens element arranged in sequence from an object side to an image side along an optical axis. Each of the first lens element and the second lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through. An optical axis region of the image-side surface of the second lens element is concave, and a periphery region of the image-side surface of the second lens element is convex.

A lens device for inspecting an object having at least one end surface and at least one lateral surface, substantially orthogonal to the end surface, is provided. The lens device includes a front optical group, a rear optical group acting as prime lens for collecting beams originating from the front optical group, a stop inserted in the rear optical group, and a sensor plane collecting beams projected by the rear optical group. The front optical group includes only refractive lenses and is formed by at least one front lens configured to receive beams both from the at least one end surface of the object, perpendicular to the optical axis, and from the at least one lateral surface of the object, substantially parallel to the optical axis, and by one or more converging lenses arranged behind the front lens and suitable to focus the beams received towards the rear optical group.

A lens device for inspecting an object having at least one end surface and at least one lateral surface, substantially orthogonal to the end surface, is provided. The lens device includes a front optical group, a rear optical group acting as prime lens for collecting beams originating from the front optical group, a stop inserted in the rear optical group, and a sensor plane collecting beams projected by the rear optical group. The front optical group includes only refractive lenses and is formed by at least one front lens configured to receive beams both from the at least one end surface of the object, perpendicular to the optical axis, and from the at least one lateral surface of the object, substantially parallel to the optical axis, and by one or more converging lenses arranged behind the front lens and suitable to focus the beams received towards the rear optical group.

A projection optical unit that images electromagnetic radiation emitted by an optoelectronic semiconductor chip includes a first lens element, a second lens element, wherein the two lens elements each include a first light-refracting surface and a second light-refracting surface located opposite the first light-refracting surface, the second light-refracting surface of the first lens element faces the first light-refracting surface of the second lens element, and the four light-refracting surfaces each include an asphere-shaped surface section such that the respective surface section forms an aspherical lens.

A projection optical unit that images electromagnetic radiation emitted by an optoelectronic semiconductor chip includes a first lens element, a second lens element, wherein the two lens elements each include a first light-refracting surface and a second light-refracting surface located opposite the first light-refracting surface, the second light-refracting surface of the first lens element faces the first light-refracting surface of the second lens element, and the four light-refracting surfaces each include an asphere-shaped surface section such that the respective surface section forms an aspherical lens.

Systems and methods for determining the identity of a liquid within a liquid dispenser are provided. A device includes a holder having an opening that is configured to retain the liquid dispenser. A surface of the liquid dispenser is configured to affix a label identifying a liquid within the liquid dispenser. A plurality of lenses are mounted on the holder. Each lens has a respective field of view that includes a respective portion of the surface of the liquid dispenser. In addition, the device includes a plurality of fiber bundles. Each fiber bundle includes an input that is configured to receive a respective signal from a respective one of the plurality of lenses. Further, the device includes an imaging sensor that is configured to receive the respective signals from the plurality of fiber bundles and to form a plurality of images of the surface of the liquid dispenser.

Systems and methods for determining the identity of a liquid within a liquid dispenser are provided. A device includes a holder having an opening that is configured to retain the liquid dispenser. A surface of the liquid dispenser is configured to affix a label identifying a liquid within the liquid dispenser. A plurality of lenses are mounted on the holder. Each lens has a respective field of view that includes a respective portion of the surface of the liquid dispenser. In addition, the device includes a plurality of fiber bundles. Each fiber bundle includes an input that is configured to receive a respective signal from a respective one of the plurality of lenses. Further, the device includes an imaging sensor that is configured to receive the respective signals from the plurality of fiber bundles and to form a plurality of images of the surface of the liquid dispenser.

A lens includes a casing, a first lens group, a second lens group and a heat dissipating member. The first lens group is disposed in the casing and close to a first side of the casing. The second lens group is disposed in the casing and close to a second side of the casing, wherein the first side is opposite to the second side. The heat dissipating member is disposed at the second side of the casing and contacts the casing.

A lens includes a casing, a first lens group, a second lens group and a heat dissipating member. The first lens group is disposed in the casing and close to a first side of the casing. The second lens group is disposed in the casing and close to a second side of the casing, wherein the first side is opposite to the second side. The heat dissipating member is disposed at the second side of the casing and contacts the casing.

A projection system includes a first lens group having positive power, an aperture stop, and a second lens group having positive power sequentially arranged from the enlargement side toward the reduction side. The portion at the reduction side of a reduction-side lens that forms the second lens group and is located at a position closest to the reduction side is a telecentric portion. The projection system satisfies Conditional Expressions (1) and (2) below,

ω>40°  (1)

YL1/YIM<6.0   (2)

where ω represents a maximum half angle of view of the overall projection system, YIM represents the distance from an optical axis to the largest image height of the projection image formed at an image formation device, and YL1 is the distance from the optical axis to a chief beam corresponding to the maximum image height in an imaginary plane.