An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power; a fifth lens; a sixth lens; a seventh lens; an eighth lens; and a ninth lens having negative refractive power, arranged in this order from an object side to an image plane side. The ninth lens is formed in a shape so that a surface thereof on the image plane side has an aspherical shape having an inflection point.

An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having negative refractive power; a fourth lens having negative refractive power; a fifth lens; a sixth lens; a seventh lens; an eighth lens; and a ninth lens having negative refractive power, arranged in this order from an object side to an image plane side. The ninth lens is formed in a shape so that a surface thereof on the image plane side has an aspherical shape having an inflection point.

An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having negative refractive power; a fourth lens having negative refractive power; a fifth lens; a sixth lens; a seventh lens; an eighth lens; and a ninth lens having negative refractive power, arranged in this order from an object side to an image plane side. The ninth lens is formed in a shape so that a surface thereof on the image plane side has an aspherical shape having an inflection point.

An optical imaging system includes a first lens, as second lens, a third lens, a fourth lens, and a fifth lens. The first lens includes a positive refractive power and a convex image-side surface. The second lens includes a positive refractive power, and the third lens includes a negative refractive power. The fourth lens includes a positive refractive power, and the fifth lens includes a positive refractive power. The first to fifth lenses are sequentially disposed from an object side toward an imaging plane.

An optical lens for being passed through by an image light includes a first lens, a second lens, and a first shading layer. The first lens has a first optical valid area and a first optical invalid area surrounding the first optical valid area. The second lens has a second optical valid area and a second optical invalid area. The second optical valid area faces the first optical valid area. The second optical invalid area surrounds the second optical valid area. The first shading layer is disposed on a side peripheral surface of the first optical invalid area and a side peripheral surface of the second optical invalid area, providing the function of blocking the non-imaging light, reducing the number of light-shielding parts, reducing the cost of parts, and shortening the assembling time.

A wide-angle lens assembly includes a first lens group with negative refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with positive refractive power and a fifth lens group with positive refractive power. The first lens group includes a first lens, the second lens group includes a second lens, and the third lens group includes a third lens. The wide-angle lens assembly satisfies: 0.5<|f.sub.LG.sub.4/f.sub.LG.sub.5|<1.8, where f.sub.LG.sub.4 is an effective focal length of the fourth lens group, and f.sub.LG.sub.5 is an effective focal length of the fifth lens group.

A method for designing an optical system for providing reliable, robust and successful realization of a distortion variation function is presented. In a preferred embodiment, the proposed distortion variation optical system includes at least two non-symmetrical elements, which are moving in the transverse direction. The proposed freeform lens contains two transmissive refractive surfaces. The freeform elements designed with this method have preferably a flat surface and a non-symmetrical freeform surface. The two plano-surfaces are preferably made to face each other, so that a miniature camera can be offered. The value of the non-symmetrical freeform surface is used to produce variable optical power when the two freeform elements undergo a relative movement in the vertical direction. Using this method, an optical system with an active distortion, smaller form factor, and better imaging quality can be obtained.

Wide angle lens for imaging objects disposed away from the optical axis towards the periphery of the field of view.

The invention relates to a 9 million pixel black light full-color lens comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a diaphragm, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens and an equivalent prism which are sequentially arranged from front to back along a light incident direction. The invention overcomes the poor resolution with visible light and infrared light, large chromatic aberration in imaging magnification and the like of the existing black light full-color lens, improves imaging effect (i.e. resolution) with visible light and infrared bands by adopting a structure of eleven spherical lenses, cooperated with the equivalent prism, simultaneously adopting a wide-spectrum optimization design for lenses, and provides a high-resolution video stream for image fusion, consequently a bright and colored image is output in a low illumination environment is obtained.

A lens device includes at least one lens group, a first reflective element, and a second reflective element. The lens group enters the lens device from a first side to a second side along an optical path for imaging. The lens group is with refractive power. The first reflective element is disposed between the first side and the lens group, wherein the first reflective element includes a first reflective surface. The second reflective element is disposed between the first reflective surface and the second side, wherein the second reflective element includes a second reflective surface. The lens device satisfies the following condition: 22 mm<G1+LB<49 mm; wherein G1 is a maximum effective optical diameter of all the lenses in the lens group closest to the first side and LB is an interval from the first reflective surface to the second reflective surface along the optical path.