US 12,449,639 B2
Imaging lens system including five lenses of +−−+− or +−++− refractive powers
Chun-Shan Chen, Taichung (TW)
Assigned to LARGAN PRECISION CO., LTD., Taichung (TW)
Filed by LARGAN PRECISION CO., LTD., Taichung (TW)
Filed on Jan. 18, 2022, as Appl. No. 17/577,825.
Application 17/577,825 is a continuation of application No. 16/553,347, filed on Aug. 28, 2019, granted, now 11,262,544.
Application 16/553,347 is a continuation of application No. 15/720,080, filed on Sep. 29, 2017, granted, now 10,437,018, issued on Oct. 8, 2019.
Application 15/720,080 is a continuation of application No. 15/067,412, filed on Mar. 11, 2016, granted, now 9,810,881, issued on Nov. 7, 2017.
Application 15/067,412 is a continuation of application No. 14/168,809, filed on Jan. 30, 2014, granted, now 9,465,197, issued on Oct. 11, 2016.
Application 14/168,809 is a continuation of application No. 13/848,150, filed on Mar. 21, 2013, granted, now 8,736,981, issued on May 27, 2014.
Application 13/848,150 is a continuation of application No. 13/433,438, filed on Mar. 29, 2012, granted, now 8,520,324, issued on Aug. 27, 2013.
Application 13/433,438 is a continuation of application No. 12/654,912, filed on Jan. 8, 2010, granted, now 8,233,224, issued on Jul. 31, 2012.
Claims priority of application No. 098123694 (TW), filed on Jul. 14, 2009.
Prior Publication US 2022/0137372 A1, May 5, 2022
Int. Cl. G02B 13/00 (2006.01); G02B 9/60 (2006.01)
CPC G02B 13/0045 (2013.01) [G02B 9/60 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An imaging lens system comprising five lens elements, the five lens elements being, 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; each of the five lens elements comprising an object-side surface facing toward the object side and an image-side surface facing toward the image side;
wherein the first lens element has positive refractive power, the object-side surface of the first lens element is convex in a paraxial region thereof, the object-side surface of the second lens element is convex in a paraxial region thereof, the third lens element has at least one inflection point, the object-side surface of the fifth lens element is convex in a paraxial region thereof, the image-side surface of the fifth lens element is concave in a paraxial region thereof;
wherein a total number of lens elements in the imaging lens assembly is five, an aperture stop is positioned at the object side of the first lens element, a radius of curvature of the object-side surface of the third lens element and a radius of curvature of the image-side surface of the third lens element have a same sign, an axial distance between the third lens element and the fourth lens element is larger than an axial distance between the fourth lens element and the fifth lens element.