# US 7,609,454 B1 · Imaging lens system with high resolution and compact size > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,454 B1 - Document ID: US7609454B1 - Status: Granted - Kind: B1 - Application number: 12/277,256 - Filed: 2008-11-24 - Granted: 2009-10-27 - Earliest claimed: 2008-10-14 - Assignees: Hon Hai Precision Industry Co., Ltd. - Inventors: Chun-Yi Yin; Chun-Hsiang Huang - Web page: https://patentgrep.com/patent/US7609454B1 ## CPC - G02B 13/004: {having four lenses} - G02B 13/18: with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An imaging lens includes, in the order from the object side to the image side, a first lens of positive refraction power, a second lens of negative refraction power, a third lens of positive refraction power, and a fourth lens of negative refraction power. The imaging lens satisfies the formulae (1) 14; and (3) S1/S2>3, where T is the overall length of the imaging lens, F is the focal length of the imaging lens, R3 is the radius of curvature of the object-side surface of the second lens, S1 is the vertical distance from the edge to the center of the image-side surface of the third lens, and S2 is the horizontal distance from the edge to the center of the image-side surface of the third lens. ## Claims ### Claim 1 An imaging lens comprising, in the order from the object side to the image side thereof, a first lens of positive refraction power, a second lens of negative refraction power, a third lens of positive refraction power, and a fourth lens of negative refraction power; the imaging lens satisfying the formulae: 14; and S1/S2>3, wherein T is the overall length of the imaging lens, F is the focal length of the imaging lens, R3 is the radius of curvature of the object-side surface of the second lens, S1 is the vertical distance from the edge to the center of the image-side surface of the third lens, and S2 is the horizontal distance from the edge to the center of the image-side surface of the third lens. ### Claim 2 (depends on 1) The imaging lens as claimed in claim 1, wherein the first, second, third and fourth lenses are made of plastic. ### Claim 3 (depends on 1) The imaging lens as claimed in claim 1, wherein the imaging lens further satisfies the formula: D23>D2, where D2 is the thickness of the second lens along the optical axis of the imaging lens and D23 is the distance between the second lens and the third lens along the optical axis of the imaging lens. ### Claim 4 (depends on 1) The imaging lens as claimed in claim 1, wherein the imaging lens further satisfies the formula: R555; and Vd2<35, wherein Vd1 is the Abbe number of the first lens and Vd2 is the Abbe number of the second lens. ### Claim 7 (depends on 1) The imaging lens as claimed in claim 1, wherein the first, second, third and fourth lenses are non-spherical lenses. ### Claim 8 (depends on 1) The imaging lens as claimed in claim 1, wherein the first lens is crescent-shaped and convex to the object side. ### Claim 9 (depends on 1) The imaging lens as claimed in claim 1, wherein the third lens is crescent-shaped and convex to the image side. ### Claim 10 An imaging lens comprising, in the order from the object side to the image side: a first lens having a positive refraction power; a second lens having a negative refraction power; an aperture stop positioned between the first lens and the second lens; a third lens having a positive refraction power; and a fourth lens having negative refraction power, wherein the imaging lens satisfies the conditions: 14; and S1/S2>3; wherein T is the overall length of the imaging lens, F is the focal length of the imaging lens, R3 is the radius of curvature of the object-side surface of the second lens, S1 is the vertical distance from the edge to the center of the image-side surface of the third lens, and S2 is the horizontal distance from the edge to the center of the image-side surface of the third lens. ### Claim 11 (depends on 10) The imaging lens as claimed in claim 10, wherein the first, second, third and fourth lenses are made of plastic. ### Claim 12 (depends on 11) The imaging lens as claimed in claim 11, wherein the imaging lens further satisfies the formula: D23>D2, wherein D2 is the thickness of the second lens along the optical axis of the imaging lens and D23 is the distance between the second lens and the third lens along the optical axis of the imaging lens. ### Claim 13 (depends on 11) The imaging lens as claimed in claim 11, wherein the imaging lens further satisfies the formula: R555; and Vd2<35, wherein Vd1 is the Abbe number of the first lens and Vd2 is the Abbe number of the second lens. ### Claim 16 (depends on 11) The imaging lens as claimed in claim 11, wherein the first, second, third and fourth lenses are non-spherical. ### Claim 17 (depends on 11) The imaging lens as claimed in claim 11, wherein the first lens is crescent-shaped and convex to the object side. ### Claim 18 (depends on 11) The imaging lens as claimed in claim 11, wherein the third lens is crescent-shaped and convex to the image side.