Abstract: An optical photographing 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 and a fifth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. The second lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. The third lens element has two surfaces being both aspheric. The fourth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof, wherein two surfaces thereof are aspheric. The fifth lens element has an image-side surface being convex in a paraxial region thereof, wherein two surfaces thereof are aspheric.

Abstract: A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens is with positive refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens is with positive refractive power. The third lens is with negative refractive power and includes a convex surface facing the object side. The fourth lens is with negative refractive power and includes a concave surface facing the object side. The fifth lens is with positive refractive power and includes a convex surface facing the image side.

Abstract: A photographing optical lens assembly includes five lens elements with refractive power, in order from an object side to an image side. The first lens element with refractive power has a convex object-side surface. The second lens element with positive refractive power has an object-side surface and an image-side surface both being aspheric. The third lens element has positive refractive power. The fourth lens element with refractive power has a concave object-side surface. The fifth lens element with refractive power has an object-side surface and a concave image-side surface with at least one inflection point, both the object-side surface and the image-side surface being aspheric.

Abstract: The present invention discloses a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of plastic material, the second lens is made of plastic material, the third lens is made of glass material, the fourth lens is made of plastic material, the fifth lens is made of glass material, and the sixth lens is made of plastic material. The camera optical lens further satisfies specific conditions.

Abstract: The present invention includes a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of glass material, the second lens is made of plastic material, the third lens is made of glass material, the fourth lens is made of plastic material, the fifth lens is made of plastic material, and the sixth lens is made of plastic material. The camera optical lens further satisfies specific conditions.

Abstract: The present invention includes a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of plastic material, the second lens is made of plastic material, the third lens is made of glass material, the fourth lens is made of plastic material, the fifth lens is made of glass material, and the sixth lens is made of plastic material. The camera optical lens further satisfies specific conditions.

Abstract: The present disclosure provides an optical imaging system of a camera lens assembly. The optical imaging system is sequentially provided with a first lens, a second lens, a third lens and a fourth lens from an object side to an imaging side along an optical axis. The first lens has a positive refractive power, an object side surface and an image side surface of the first lens are both convex surface. An object side surface of the second lens is a convex surface, and an image side surface of the second lens is a convex surface. The third lens has a negative refractive power and the fourth lens has a negative refractive power. An effective focal length of the first lens f1, an effective focal length of the fourth lens f4, and an effective focal length of the optical imaging system f satisfy: ?0.8<(f1+f4)/f<0.

Abstract: The present invention discloses a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of plastic material, the second lens is made of glass material, the third lens is made of plastic material, the fourth lens is made of plastic material, the fifth lens is made of glass material, and the sixth lens is made of plastic material. The camera optical lens further satisfies specific conditions.

Abstract: The present invention includes a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of plastic material, the second lens is made of plastic material, the third lens is made of plastic material, the fourth lens is made of plastic material, the fifth lens is made of glass material, and the sixth lens is made of plastic material. The camera optical lens further satisfies specific conditions.

Abstract: A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged along an optical axis in order from an object side to an image side. The first lens is a meniscus lens with positive refractive power, and an object-side surface of the first lens is convex. The second lens is a lens with positive refractive power, and an object-side surface of the second lens is convex. The third lens is a lens with negative refractive power, and an object-side surface and an image-side surface of the third lens are concave. The fourth lens is a meniscus lens with negative refractive power. The fifth lens is a lens with positive refractive power, and an object-side surface of the fifth lens is convex.

Abstract: The present invention relates to an imaging lens, the imaging lens including, in an ordered way from an object side, a first lens having positive (+) refractive power and convexly formed at an object side surface; a second lens having positive (+) refractive power and concavely formed at an object side surface; and a third lens having negative (?) refractive power, wherein the imaging lens meets a conditional expression of 1.6<ND3<1.7, where ND3 is a refractive index of the third lens.

Abstract: An original reading lens includes a four-group, five-element lens configuration including three positive lenses and two negative lenses, wherein the positive lens is constructed by a glass material of low dispersion, and the negative lens is constructed by a glass material of high dispersion, a partial dispersion ? gd is defined by ? gd=(ng?nd)/(nF?nc) by a refractive index nd of d line (587.56 nm), a refractive index nc of c line (656.27 nm), a refractive index nF of F line (486.13 nm), and a refractive index ng of g line (435.

Abstract: A lens for reading an original, comprises five lenses as a whole including two positive and two negative lenses, an aspherical surface provided on at least one surface of the five lenses, a construction of four lens groups for five lenses which include a cemented lens constructed by cementing one of the positive lenses and one of the negative lenses, an aperture stop disposed between a second and third lens groups, and the cemented lens disposed adjacent to the aperture stop.

Abstract: An original reading lens includes a four-group, five-element lens configuration including three positive lenses and two negative lenses, wherein the positive lens is constructed by a glass material of low dispersion, and the negative lens is constructed by a glass material of high dispersion, a partial dispersion ?gd is defined by ?gd=(ng?nd)/(nF?nc) by a refractive index nd of d line (587.56 nm), a refractive index nc of c line (656.27 nm), a refractive index nF of F line (486.13 nm), and a refractive index ng of g line (435.

Abstract: A modified Gaussian lens comprises, successively from the object side, meniscus first and second lenses L1 and L2 each having a positive refracting power with a convex surface directed onto the object side, a meniscus third lens L3 having a negative refracting power with a concave surface directed onto the image side, a meniscus fourth lens L4 having a negative refracting power with a concave surface directed onto the object side, and a fifth lens L5 made of a biconvex lens; and satisfies the following conditional expressions (1) to (6): (1) 0.37<f1,2/f<0.57, (2) 0.62<&Sgr;d/f<1.03, (3) 0.13<L/f<0.26, (4) 22.0<&ngr;2−&ngr;3<36.0, (5) 6.0<(1/R6+1/|R7|)×f<11.2, (6) −1.72<R10/R1121 0. Thus, while in a compact, five-group, five-element configuration, high performances and conditions suitable for a relatively telephoto lens mounted to a monitor camera or the like, i.e., an F number of about 1.

Abstract: In a Xenotar type image-readout lens of a four-group five-element configuration, predetermined conditional expressions are satisfied so as to attain a bright lens system, while favorably correcting chromatic aberration. In a Xenotar type lens system composed of five sheets of lenses (L.sub.1 to L.sub.5), the second lens (L.sub.2) and the third lens (L.sub.3) are cemented together, a stop (i) is disposed between the third lens (L.sub.3) and the fourth lens (L.sub.4), and the following conditional expressions are satisfied:1.78.ltoreq.N.sub.1, 47.0<.upsilon..sub.3 +.upsilon..sub.4 <57.0, 1.4<f.sub.123 /f<2.0, 22<.upsilon..sub.2 -.upsilon..sub.3,1.37<.vertline.f.sub.2 /f.sub.3 .vertline.<1.64, 1.24<R.sub.42 /R.sub.41 <1.37, 33<.upsilon..sub.5 .times.(N.sub.

Abstract: Axial gradient index of refraction lens elements are used in a lens system, for instance for a photographic objective lens, to correct monochromatic and chromatic lens aberrations, thereby reducing the number of lens elements required to achieve good optical performance in the overall lens design compared to for instance a lens system using aspheric lenses. The gradient index (GRIN) lens elements are bi-convex and/or meniscus type lens elements. The large refractive index gradients as well as large dispersion value gradients provide aberration correction in the overall lens system. A high aperture ratio lens system uses six lens elements where the first and last lens elements are positive power lens elements having refractive index and/or dispersion gradients along the optical axis.