Abstract: A dual lens inspection device, having a low power lens group satisfies the condition value of 3.0?magnification?1.0; a high power lens group, satisfies the condition value of 25.0?magnification?15.0; a light source module projecting an illumination light source to the low power lens group and the high power lens group; a beam splitter arranged on the optical path of the illumination light source, so as to generate a first optical path passing through the low power lens group and a second optical path passing through the high power lens group, and projected on an object located on the same plane; a first luminous flux module and a second luminous flux module control the luminous flux of the first and second optical path, and then achieve the effect of dark field illumination; a camera using the beam splitter to achieve a beam steering effect, and then captures the image of the object.

Abstract: A photolithography projection lens, having a plurality of lens elements and a light diaphragm arranged among them, arranged along an optical axis, and comprising an object side and an image side respectively arranged at the front and rear ends of the plurality of lens elements; wherein: the diopters of the two lenses respectively near the object side and the image side must be positive; each of the lens elements is a single lens without cement; the angle between the chief rays at different image height positions and the optical axis is <1 degree, and the angle between the chief rays at different object height positions and the optical axis is <1 degree; and under the projection of 350˜450 nm wavelength light, it provide the imaging effect of precise magnification.

Abstract: An optical lens system includes, in order from a magnified side to a minified side, a first lens group of positive refractive power and a second lens group of positive refractive power. The first lens group includes a first lens and a second lens, and the second lens group includes a third lens and a fourth lens. One of the third lens and the fourth lens includes one aspheric surface, and each of the lenses in the optical lens system is a singlet lens. The optical lens satisfies a condition of TE(?=400)>94%, where TE(?=400) denotes an overall transmittance of all of the lenses in the optical lens system measured at a wavelength of 400 nm.

Abstract: A projection optical system with a concave reflector in the projection lens, comprising: an image source; a lens group; a reflector; an image and an aperture, the lens group and the reflector form multiple optical paths between the image and image source, each optical path has a chief ray and a marginal ray, the chief ray of one of the optical paths forms a chief ray of a paraxial image height at the part where image source be near to the optical axis, the chief ray of another one of the optical paths forms a marginal ray of an off-axis image height at the part where image source be far from the optical axis; wherein 2.2<F1/F2<3.0; 8<IMH/TR/Fno<19; 5<IMH*T1/T2<8. whereby the optimal optical performance of resolving power and optical path interference allowance will be achieved.

Abstract: An optical lens system includes, in order from a magnified side to a minified side, a first lens group of positive refractive power and a second lens group of positive refractive power. The first lens group includes a first lens and a second lens, and the second lens group includes a third lens and a fourth lens. One of the third lens and the fourth lens includes one aspheric surface, and each of the lenses in the optical lens system is a singlet lens. The optical lens satisfies a condition of TE(?=400)>94%, where TE(?=400) denotes an overall transmittance of all of the lenses in the optical lens system measured at a wavelength of 400 nm.

Abstract: An optical lens system using ultraviolet for imaging includes, in order from a magnified side to a minified side, a first lens group of positive refractive power and a second lens group of positive refractive power. The second lens group includes at least one cemented lens and at least one aspheric lens. The optical lens system satisfies the condition of TE(?=400)>94%, where TE(?=400) denotes an overall transmittance of all of the lenses in the optical lens system measured at a wavelength of 400 nm and is equal to a product of respective internal transmittances of all of the lenses measured at a wavelength of 400 nm.

Abstract: A projection optical system, comprising: an image source; a lens group; a reflector; an image and an aperture, the lens group and the reflector form multiple optical paths between the image and image source, each optical path has a chief ray and a marginal ray, the chief ray of one of the optical paths forms a chief ray of a paraxial image height at the part where image source be near to the optical axis, the chief ray of another one of the optical paths forms a marginal ray of an off-axis image height at the part where image source be far from the optical axis; whereby forming a first point and a second point, the first point located at the origin and the second point is located in the first quadrant, and forming a third point and a fourth point, the third point located at the fourth quadrant and the fourth point is located in the second quadrant.

Abstract: A zoom lens includes a first lens group with a negative refractive power, a second lens group with a positive refractive power, and an aperture stop disposed in and movable with the second lens group. Each of the first lens group and the second lens group moves individually. The zoom lens further includes a doublet lens disposed on a first side of the aperture stop and between the first lens group and the aperture stop, and at most two lenses including at least one aspheric lens are disposed on a second side of the aperture stop.

Abstract: A projection lens structure mainly includes a first group of lenses with a negative dioptric value, a second group of lenses with a positive dioptric value, a third group of lenses with a positive dioptric value and a fourth group of lenses with a negative dioptric value. The first group of lenses further includes at least a first lens and a second lens, of which the first lens ha a plastic aspheric lens in a meniscus shape with a focal length between ?25˜?80 mm. The second group of lenses further includes at least a third lens. The third group of lenses further includes at least a first doublet with a focal length between 25˜80 mm. The fourth group of length further includes at least a group of doublets, a fourth lens and a fifth lens.

Abstract: A projection lens structure mainly includes a first group of lenses with a negative dioptric value, a second group of lenses with a positive dioptric value, a third group of lenses with a positive dioptric value and a fourth group of lenses with a negative dioptric value. The first group of lenses further includes at least a first lens and a second lens, of which the first lens ha a plastic aspheric lens in a meniscus shape with a focal length between ?25˜?80 mm. The second group of lenses further includes at least a third lens. The third group of lenses further includes at least a first doublet with a focal length between 25˜80 mm. The fourth group of length further includes at least a group of doublets, a fourth lens and a fifth lens.

Abstract: A zoom lens includes a first lens group with a negative refractive power, a second lens group with a positive refractive power, and an aperture stop disposed in and movable with the second lens group. Each of the first lens group and the second lens group moves individually. The zoom lens further includes a doublet lens disposed on a first side of the aperture stop and between the first lens group and the aperture stop, and at most two lenses including at least one aspheric lens are disposed on a second side of the aperture stop.

Abstract: An image-space telecentric lens includes, in order from a magnified side to a minified side, a first lens group of negative refractive power, an aperture stop, and a second lens group of positive refractive power. The first lens group has at least one aspheric surface, and the second lens group has at least one aspheric surface. The second lens group has a cemented lens of positive refractive power, and the cemented lens is nearest the aperture stop as compared with other lens in the second lens group. The image-space telecentric lens satisfies the condition: TT<100 mm, where TT denotes a length measured along an optical axis and between two outermost opposite lens surfaces of the image-space telecentric lens.

Abstract: An optical lens system using ultraviolet for imaging includes, in order from a magnified side to a minified side, a first lens group of positive refractive power and a second lens group of positive refractive power. The second lens group includes at least one cemented lens and at least one aspheric lens. The optical lens system satisfies the condition of TE(?=400)>94%, where TE(?=400) denotes an overall transmittance of all of the lenses in the optical lens system measured at a wavelength of 400 nm and is equal to a product of respective internal transmittances of all of the lenses measured at a wavelength of 400 nm.

Abstract: An optical lens system includes, in order from a magnified side to a minified side, a first lens group and a second lens group. The first lens group of negative refractive power has at least one aspheric surface, and the second lens group of positive refractive power has at least one aspheric surface. Each of the lenses in the optical lens system is a singlet lens, and the condition: TE(?=365)>70% is satisfied, where TE(?=365) denotes an overall transmittance of all of the lenses in the optical lens system measured at a wavelength of 365 nm.

Abstract: A projection lens structure includes a first group of lens, an aperture stop and a second group of lend. The aperture stop is arranged at a rear of the first group of lens to form a long-focus lens with a focal length between 30-80 mm and the second group of lens is arranged at a rear of the aperture stop to form a short-focus lens with a focal length between 20-30 mm. With the long-focus lens and the short-focus lens operated correspondingly, the structure of the projection lens is simple and the manufacturing cost is low without affecting the quality of produced images.

Abstract: A zoom lens arranged along an optical axis includes a first lens group and a second lens group. The second lens group has at least one aspheric lens. The first lens group moves toward an image side and the second lens group moves away from the image side along the optical axis during zooming. The first lens group is moved for focusing, and the second lens group is moved for zooming.

Abstract: A projection lens structure includes a first group of lens, an aperture stop and a second group of lend. The aperture stop is arranged at a rear of the first group of lens to form a long-focus lens with a focal length between 30-80 mm and the second group of lens is arranged at a rear of the aperture stop to form a short-focus lens with a focal length between 20-30 mm. With the long-focus lens and the short-focus lens operated correspondingly, the structure of the projection lens is simple and the manufacturing cost is low without affecting the quality of produced images.

Abstract: A projection system includes a long-focus lens that is able to generate an image independently with a focal length between 70-300 mm, a short-focus lens that is able to generate an image independently with a focal length between 3-8 mm and shares an optical axis with the long-focus lens and at least one reflector to reflect the optical axis for direction change. When the long-focus lens generates an image, the short-focus lens then generates the image to a pre-determined position thereby.

Abstract: A zoom lens includes a first lens group, a second lens group, a third lens group, a fourth lens group and an aperture. The first lens group, the second lens group, the third lens group and the fourth lens group are sequentially arranged in a direction. The aperture is located between the second lens group and the third lens group. When the zoom lens performs a zoom operation, the first lens group and the third lens group are fixed and the second lens group and the fourth lens group are moved, and a moving distance of the fourth lens group on an optical axis of the zoom lens is less than 5 mm.

Abstract: A zoom lens arranged along an optical axis includes a first lens group and a second lens group. The second lens group has at least one aspheric lens. The first lens group moves toward an image side and the second lens group moves away from the image side along the optical axis during zooming. The first lens group is moved for focusing, and the second lens group is moved for zooming.