Abstract: A camera optical lens includes, object side to image side, a first lens having positive refractive power, a second lens having positive refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, and a fifth lens having negative refractive power, and satisfies: 1.10?f1/f?1.50; 0.40?R3/R4?1.00; and 1.00?d5/d6?2.00, where f is a focal length of the camera optical lens, f1 is a focal length of the first lens, R3 is a central curvature radius of an object side surface of the second lens, R4 is a central curvature radius of an image side surface of the second lens, d5 is an on-axis thickness of the third lens, and d6 is an on-axis distance from an image side surface of the third lens to an object side surface of the fourth lens, thereby having a large aperture, a wide angle and ultra-thinness with good optical performance.

Abstract: The present disclosure discloses a camera optical lens. The camera optical lens includes, in an order from an object side to an image side, a first lens, an aperture, a second lens, a third lens, a fourth lens, and a fifth lens. The camera optical lens further satisfies specific conditions.

Abstract: These variable-magnification observation optical systems are provided with an objective system, an erecting system, and an eyepiece system. In order from the object side, the objective system has a positive first lens group, a positive second lens group, and a negative third lens group. In order from the object side, the eyepiece system has a positive fourth lens group and a positive fifth lens group. The erecting system is located between the first and second lens groups. In order from the object side, the fifth lens group has the following, with air gaps in between: a negative meniscus lens element, the concave surface of which faces the object side; a negative meniscus lens element, the convex surface of which faces the object side; and a biconvex positive lens element.

Abstract: According to exemplary embodiments of the present invention, an imaging lens includes in an ordered way from an object side, a first lens movable and having positive (+) refractive power, a second lens having negative (?) refractive power, a third lens having positive (+) refractive power, a fourth lens having positive (+) refractive power, and a fifth lens having negative (?) refractive power, wherein, a conditional expression of 0.5<f1/fz1, f1/fz2, f1/fz3<1.5 is satisfied, where focus distances of imaging lens are respectively fz1, fz2 and fz3, and a focus distance of the first lens is f1 at zoom positions 1, 2 and 3.

Abstract: Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises five lens elements positioned sequentially from an object side to an image side. Through controlling the convex or concave shape of the surfaces and/or the refracting power of the lens elements and designing an equation, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.

Abstract: An imaging lens substantially consists of, in order from an object side, five lenses of a first lens that has a positive refractive power and has a meniscus shape which is concave toward an image side, a second lens that has a negative refractive power and has a meniscus shape which is concave toward the image side, a third lens that has a biconcave shape, a fourth lens that has a positive refractive power and has a meniscus shape which is convex toward the image side, and a fifth lens that has a biconcave shape and has an aspheric shape which has at least one extreme point on an image side surface. Further, the imaging lens satisfies a predetermined conditional expression.

Abstract: The present invention is to provide an imaging lens and an imaging device that achieve optical performance high enough for high-pixel imaging elements, and have the smallest possible sizes and thicknesses. A first lens having positive refractive power, an aperture stop, a second lens having positive or negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, and a fifth lens having negative refractive power are provided in this order from the object side, and the following conditional expressions (1), (2), and (3) are satisfied: (1) 0.80<f1/f<1.40, (2) f1/|f3|<1.50, and (3) ?0.20<f1/f2<0.90, where f represents the focal length of the entire lens system, f1 represents the focal length of the first lens, f2 represents the focal length of the second lens, and f3 represents the focal length of the third lens.

Abstract: An imaging lens includes a positive first lens; a negative second lens with a meniscus lens shape directing a convex surface thereof to an object side near an optical axis; a positive third lens; a negative fourth lens with a meniscus lens shape directing a concave surface thereof to the object side near the optical axis; a negative fifth lens with a meniscus lens shape directing a convex surface thereof to the object side near the optical axis, arranged in this order from the object side. The imaging lens satisfies the following conditional expressions when the first lens has a focal length f1, the second lens has a focal length f2, the third lens has a focal length f3, the fourth lens has a focal length f4, and the fifth lens has a focal length f5: f1<f3 and |f2|<f3 f3<|f4| and |f2|<|f5|.

Abstract: An image capturing optical 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 has positive refractive power. The second lens element has positive refractive power. The third lens element has negative refractive power. The fourth lens element has positive refractive power. The fifth lens element with negative refractive power is made of plastic material, and has an image-side surface being concave at a paraxial region and being convex at a peripheral region, wherein at least one of an object-side surface and the image-side surface of the fifth lens element is aspheric.

Abstract: This invention provides an optical imaging lens system in order from an object side to an image side comprising five non-cemented lens elements with refractive power: a first lens element with positive refractive power having a convex object-side surface; a second lens element with positive refractive power; a third lens element with negative refractive power, and both surfaces being aspheric; a fourth lens element having a convex image-side surface, and both surfaces being aspheric; and a plastic fifth lens element having a concave image-side surface, both surfaces being aspheric, and at least one inflection point is formed on at least one of the surfaces thereof. By such arrangement, the refractive power of the optical imaging lens system can be effectively distributed with improved light converging power so that the total track length can be shortened effectively, and the aberration of system can be corrected to facilitate high image quality.

Abstract: An optical imaging system includes, in order from an object side to an image side, a first lens element with a positive refractive power, a second lens element, a third lens element, a fourth lens element with a positive refractive power having an aspheric surface and a fifth lens element with a negative refractive power. An image-side surface of the fifth lens element is concave, and at least one of two surfaces of the fifth lens element is aspheric. The relationship between a sum of thicknesses of all lens elements with refractive powers on an optical axis and a distance on the optical axis between an object-side surface of the first lens element and the image-side surface of the fifth lens element in the optical imaging system can effectively reduce the total length as well as the sensitivity of the optical imaging system while gaining superior resolution.

Abstract: An imagery optical system, sequentially from an object side to an image side on an optical axis comprising: the first lens element with positive refractive power, the second lens element with positive refractive power, the third lens element, the fourth lens element, and the fifth lens element having at least one inflection point. Each of the five lens elements may be made of plastic and comes with bi-aspheric surfaces. The imagery optical system satisfies conditions related to shorten the total length and to reduce the sensitivity for use in compact cameras and mobile phones with a camera function.

Abstract: An optical unit includes a first lens, a diaphragm, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens is a positive meniscus lens which is convex toward an object side. The second lens has a positive power. The third lens has a negative power. The fourth lens has a positive power. The fifth lens has a negative power. Those are arranged in the stated order from the object side to an image plane side.

Abstract: The present invention is to provide an imaging lens and an imaging device that achieve optical performance high enough for high-pixel imaging elements, and have the smallest possible sizes and thicknesses. A first lens having positive refractive power, an aperture stop, a second lens having positive or negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, and a fifth lens having negative refractive power are provided in this order from the object side, and the following conditional expressions (1), (2), and (3) are satisfied: (1) 0.80<f1/f<1.40, (2) f1/|f3|<1.50, and (3) ?0.20<f1/f2<0.90, where f represents the focal length of the entire lens system, f1 represents the focal length of the first lens, f2 represents the focal length of the second lens, and f3 represents the focal length of the third lens.

Abstract: The present disclosure relates to a projection lens. The projection lens includes, in order from the magnified end to the minified end thereof, a first lens of negative refraction power, a second lens of positive refraction power, a third lens of negative refraction power, a fourth lens of positive refraction power, and a fifth lens of positive refraction power. The forth lens and the third lens are bonded to integrally form a compound lens of negative refraction power. The projection lens satisfies the following condition: 0.4<R12/f<0.9. Wherein, R12 is a radius of curvature of the surface at the minified end of the first lens, f is an effective focal length of the projection lens.

Abstract: There is provided a high-definition imaging optical system including: an aperture stop; a first lens disposed at an image side of the aperture stop, the first lens having a positive refractive power and having a convex object-side surface; a second lens disposed at an image side surface of the first lens; a third lens disposed at an image side surface of the second lens; a fourth lens having a convex image-side surface and having a positive refractive power; and a fifth lens having a concave image-side surface and having a negative refractive power, wherein a combined refractive power of the second and third lenses is negative. The optical system is high-performing and compact and can be further improved in resolution. Also, the optical system can correct chromatic aberration and improve color fringing in the case of indoor or outdoor photographing.

Abstract: A lens system comprises a first lens positive in power, a second lens positive in power, a third lens negative in power, a fourth lens positive in power, and a fifth lens negative in power. The lens system meets a criteria of 1.6<TT/f<1.8, 1.6<f/f2<1.8, and ?0.6<f/f5<?0.4, wherein TT denotes a distance between an object-side surface of the first lens and an image plane of the lens system; f2 denoting an effective focal length of the second lens; f denoting an effective focal length of the entire lens system.

Abstract: A wide angle projection lens consists of a Gnp lens group having positive refractive power and a Gf lens group having positive refractive power in the order from a large conjugate side toward a small conjugate side, and further the Gnp lens group consists of a Gn lens group having negative refractive power and a Gp lens group having positive refractive power in the order from the large conjugate side toward the small conjugate side, while satisfying −1.8<fn/f<−1.1, 3.2<fp/f<5.5, 1.2<Dnp/f<2.4 and 2.8<ff/fnp<4.4, where f: focal length of the whole lens system, fn: focal length of the Gn lens group, fp: focal length of the Gp lens group, Dnp: air spacing between the Gn lens group and the Gp lens group, fnp: focal length of the Gnp lens group and ff: focal length of the Of lens group.

Abstract: A Gaussian lens having no more than six lens elements of refractive power is formed of, in order from the object side: a first lens element which is biconvex, a second lens element which is a positive meniscus lens with its convex surface on the object side, a third lens element which is biconcave, a stop, a joined lens formed of a fourth lens element which is biconcave that is joined to a fifth lens element which is biconvex; and a sixth lens element having positive refractive power. Specified conditions are satisfied in order to provide a compact lens having an f-number FNO of 1.44 or less, an image angle 2&ohgr; of 23.8 degrees or more, and wherein the various aberrations are favorably corrected. The Gaussian lens of the invention is intended for mounting in monitor cameras.

Abstract: An imaging lens comprises, successively from an object side, a positive first lens L1 having a convex surface directed onto the object side, a negative second lens L2 having a concave surface directed onto an image side, a third lens L3 of a positive meniscus form having a convex surface directed onto the object side, a fourth lens L4 of a positive meniscus form having a convex surface directed onto the image side, a negative fifth lens L5 having a concave surface directed onto the object side, and a positive sixth lens L6 having a convex surface directed onto the image side, the first lens L1 and the second lens L2 being cemented to each other, the fifth lens L5 and the sixth lens L6 being cemented to each other, the imaging lens satisfying the following conditional expressions: 0.01<d6/f<0.17 0.9<f3/f<1.8 −0.4<f/f12<0.4 0.51<f34/f<0.72 1.15<v1/v2<1.

Abstract: A microscope objective lens is provided as a semi-apochromatic microscope objective lens which has a magnification of about 40, has favorably corrected various kinds of aberration, and can also be used for observing fluorescence under downward radiation. The microscope objective lens comprises, successively from the object side, a positive meniscus lens component G1 having a concave surface directed onto the object side, a positive meniscus cemented lens component G2 having a concave surface directed onto the object side, a biconvex lens component G3, a cemented lens component G4 having, at least, a negative lens and a biconvex lens, and a negative meniscus cemented lens component G5 having a concave surface directed onto the image side, wherein the following conditions:0.1<r1/r3<0.3-30<f2/f1<-105<D/f<8.5are satisfied.

Abstract: An optical apparatus comprises a first lens to be used for changing a magnifying power; a second lens to be used for focus adjustment and also for compensation required when the magnifying power is varied; a focus detecting circuit for detecting an in-focus state; a first control circuit for driving the second lens to an in-focus position on the basis of information obtained by the focus detecting circuit; a detecting circuit for detecting the position of the second lens; and a second control circuit for driving the second lens to a normal focus adjustable position after driving the second lens to a reset position for the purpose of enabling the detecting circuit to perform a detecting action. The second control circuit is arranged to drive the second lens from the reset position to the focus adjustable position at a higher speed than the driving speed set by the first control circuit.