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: A fixed focus projection lens, from the magnifying side to the narrowing side of the lens sequentially comprising: a front lens group and a rear lens group, the front lens group has 8 to 11 lenses, the front lens group has a front aspherical lens, the rear lens group has 8 to 11 lenses, the rear lens group has a rear aspherical lens, for satisfying 1.5<|fa/f|<3 and 4<Bf/f<5, f is the focal length of the system, fa is the focal length of the front lens group from the first lens to the fifth lens, Bf is the rear focal length obtained by air conversion, the rear lens group has an aperture.

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: 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 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 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.