52results about How to "High order aberration" patented technology

This invention provides an imaging lens assembly including five lens elements with refractive power, in order from an object side toward an image side: a first lens with positive refractive power having a convex object-side surface, a second lens with negative refractive power, a third lens having a concave object-side surface, a fourth lens with positive refractive power having an object-side surface and a convex image-side surface, and at least one of both surfaces thereof being aspheric, a fifth lens with negative refractive power having a concave image-side surface with at least one inflection point formed thereon. An aperture stop is positioned between an imaged object and the second lens. The imaging lens assembly further comprises an electronic sensor on which an object is imaged. With such arrangement, the size and the optical sensitivity of the lens assembly can be reduced. A high image resolution is also obtained.

This invention provides an image capturing lens assembly in order from an object side to an image side comprising: a first lens group has only one first lens element with a positive refractive power, and a second lens group in order from the object side to the image side comprising: a second lens element with a negative refractive power, a third lens element, a fourth lens element and a fifth lens element; while a distance between an imaged object and the image capturing lens assembly changes from far to near, focusing is performed by moving the first lens group along the optical axis and a distance between the first lens group and an image plane changes from near to far. By such arrangement and focusing adjustment method, good image quality is achieved and less power is consumed.

This invention provides an optical lens assembly comprising, in order from an object side to an image side: a first lens element with positive refractive power; a second lens element with positive refractive power; a third lens element with negative refractive power having a concave object-side surface and a convex image-side surface, at least one of the object-side and image-side surfaces thereof being aspheric; and a fourth lens element with positive refractive power having an aspheric object-side surface and an aspheric image-side surface; wherein the number of lens elements with refractive power is four.

An image lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element has refractive power. The third lens element has positive refractive power. The fourth lens element has negative refractive power. The fifth lens element with positive refractive power has a convex object-side surface and a concave image-side surface. The sixth lens element with positive refractive power has a convex object-side surface and a concave image-side surface, wherein the image-side surface thereof changes from concave at a paraxial region to convex at a peripheral region. The fifth and sixth lens elements are made of plastic, and the surfaces thereof are aspheric.

The present invention provides an optical imaging lens assembly comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power having a concave object-side surface; and a third lens element with negative refractive power having a concave image-side surface, at least one of the object-side and image-side surfaces thereof being aspheric. With the aforementioned arrangement of lens elements, the total track length of the optical imaging lens assembly can be effectively reduced, the sensitivity of the optical system can be attenuated, a large field of view can be achieved and the image quality can be improved.

This invention provides an optical imaging lens assembly, in order from an object side toward an image side including: a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface, a third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, a fourth lens element with negative refractive power having a concave image-side surface, and the two surfaces being aspheric; wherein the optical imaging lens assembly further comprises an aperture stop disposed between an imaged object and the first lens element, and there are four lens elements with refractive power.

This invention provides a photographing optical lens assembly comprising, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface, the object-side and image-side surfaces thereof being aspheric; a third lens element having a concave image-side surface, the object-side and image-side surfaces thereof being aspheric, at least one inflection point formed on the image-side surface; wherein there are three lens elements with refractive power. Such an arrangement of lens elements can effectively reduce the total track length of the lens assembly, attenuate the sensitivity of the optical system and obtain higher resolution.

This invention provides a photographing optical system, in order from an object side to an image side comprising: a first lens element with positive refractive power having a convex object-side surface and concave image-side surface; a second lens element with negative refractive power; a third lens element with positive refractive power having a concave object-side surface and a convex image-side surface; and a fourth lens element with negative refractive power having a concave image-side surface and both the object-side and image-side surfaces thereof being aspheric; wherein the photographing optical system has four lens elements with refractive power. By such arrangement, the total track length and photosensitivity of the photographing optical system can be effectively reduced, and high image resolution can be obtained.