Abstract: An optical image lens used in narrow field of view and having compact size and low distortion characteristics is disclosed to include, from an object side to an image side along an optical axis, a first lens with positive refractive power, a second lens and a third lens glued as a doublet with negative refractive power, a fourth lens and a fifth lens glued as a doublet with positive refractive power, a sixth lens with positive refractive power, a seventh lens with positive refractive power, and an eighth lens with negative refractive power.

Abstract: A wide-angle lens assembly includes, in order from an object side to an image side along an optical axis, a first lens with negative refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, a sixth lens with negative refractive power, and a seventh lens with positive refractive power; wherein, the wide-angle lens assembly satisfies the following condition: 0.2<f/f7<0.5; where f is a focal length of the wide-angle lens assembly and f7 is a focal length of the seventh lens. With the aforementioned design, the wide-angle lens assembly can have a large FOV and an improved imaging quality.

Abstract: A fixed-focus projection lens, in order from an image side to an image source side along an optical axis, includes a first lens with negative refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, and a sixth lens with positive refractive power. The second lens is a biconvex lens. While projecting, a light enters the fixed-focus projection lens from the image source side, and passes through the fixed-focus projection lens. Further more, at least one surface of the first lens is aspherical, a refractive index of the second lens is greater than 1.8, and a refractive index of the fifth lens is greater than 1.7. Such arrangement helps to lower a spherical aberration of spherical lens, shortening the optical system, and effectively lower the distortion.

Abstract: A fixed-focus projection lens, in order from an image side to an image source side along an optical axis, includes a first lens with negative refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with positive refractive power, and a sixth lens with positive refractive power. The second lens is a biconvex lens. While projecting, a light enters the fixed-focus projection lens from the image source side, and passes through the fixed-focus projection lens. Further more, at least one surface of the first lens is aspherical, a refractive index of the second lens is greater than 1.8, and a refractive index of the fifth lens is greater than 1.7. Such arrangement helps to lower a spherical aberration of spherical lens, shortening the optical system, and effectively lower the distortion.

Abstract: A wide angle lens includes, in order from an object side to an image side along an optical axis, a negative first lens, a negative second lens, a positive third lens, a positive fourth lens, a negative fifth lens, and a positive sixth lens, wherein the sixth lens is adhered to the fifth lens to form a doublet lens. In addition, the wide angle lens further satisfies the condition of SD2/R2>0.6, where SD2 is half of an effective aperture of a surface of the first lens which faces the image side, and R2 is a radius of curvature of the surface of the first lens which faces the image side. Whereby, the FOV of the wide angle lens can be greater than 140 degrees, and the wide angle lens is compatible with a large-sized, e.g., 1/2.3?, photosensitive component.

Abstract: An imaging lens includes an aperture and a first to a fifth lenses in order from an object side to an image side. The first lens is a positive meniscus lens made of glass, which has at least one aspheric surface. The Abbe number of the first lens is no less than 60. The second lens is a negative meniscus lens made of plastic, which has at least one aspheric surface. The third lens is a positive meniscus lens made of plastic, which has at least one aspheric surface. The fourth lens is a positive meniscus lens made of plastic, which has at least one aspheric surface. The fifth lens is a negative lens made of plastic, and both surfaces thereof are aspherical. A diopter of the fifth lens gradually turns from negative to positive from where an optical axis passes through to a margin thereof.

Abstract: A zoom lens includes a negative first lens group, an aperture, and a positive second lens group. The first lens group includes a negative first lens, a negative second lens, and a positive third lens. The second lens group includes a positive fourth lens, a negative fifth lens, a negative sixth lens, and a positive seventh lens, wherein the fifth lens is formed by adhering a positive lens and a negative lens, and the sixth lens is a meniscus lens. The zoom lens can be switched toward a telephoto mode from a wide mode by moving the second lens group from the image side toward the object side.

Abstract: A lens made of glass, includes a first surface, a second surface, and a flange. The first surface has a locating portion and a first reference portion abutting against a first positioning object to fix a relative position between the first surface and the first positioning object in an axial direction and a radial direction thereof. The second surface has a second reference portion abutting against a second positioning object to fix a relative position between the second surface and the second positioning object in an axial direction thereof. The flange is formed on an outer periphery around the first surface and the second surface.

Abstract: An optical image pick-up lens includes an aperture, a first lens, a second lens, a third lens, and a fourth lens in order along an optical axis from an object side to an image side. The first lens is a positive plastic meniscus lens having a convex surface facing the object side and a concave surface facing the image side. The second lens is a negative plastic biconcave lens. The third lens is a positive glass meniscus lens having a concave surface facing the object side and a convex surface facing the image side. The fourth lens is a plastic lens having an aspheric surface facing the object side, wherein the fourth lens is gradually changed from positive to negative from the center to the edge of the fourth lens.

Abstract: A lens assembly includes a lens barrel, a first lens, a second lens, and a third lens. The first lens is provided in the lens barrel with an outer periphery abutting against an inner wall of the lens barrel. The second lens abuts against the first lens, and there is a spacing formed between the second lens and the inner wall of the lens barrel. The third lens abuts against the second lens, and there is another spacing formed between the third lens and the inner wall of the lens barrel. With abutment relations of these lenses, relative positions between each lens can be fixed, and therefore the influence of allowable tolerance of the lens barrel upon optical performance is greatly reduced.