# US 2019/0170971 A1 · Imaging lens having four lens elements, and electronic apparatus having the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170971 A1 - Document ID: US20190170971A1 - Status: Published application - Kind: A1 - Application number: 16/203,074 - Filed: 2018-11-28 - Published: 2019-06-06 - Earliest claimed: 2012-08-27 - Assignees: Genius Electronic Optical Co., Ltd. - Applicants: Genius Electronic Optical Co., Ltd. - Inventors: KUO-WEN CHANG; POCHE LEE; WEI-YU LO - Web page: https://patentgrep.com/patent/US20190170971A1 ## CPC - G02B 13/004: {having four lenses} - G02B 7/021: {for more than one lens} - G02B 9/34: having four components only - G02B 13/18: with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)} - H04N 23/51: Housings - H04N 23/55: Optical parts specially adapted for electronic image sensors; Mounting thereof - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract An imaging lens includes a first lens element, a second lens element, a third lens element, and a fourth lens element arranged from an object side to an image side in the given order. The first lens element has positive refractive power and an image-side surface with a concave portion in the vicinity of an optical axis. The object-side surface of the third lens element has a concave portion in a vicinity of an optical axis of the imaging lens. The object-side surface of the fourth lens element has a convex portion in a vicinity of the optical axis of the imaging lens. The imaging lens does not have any lens element with refractive power other than the first, second, third, and fourth lens elements. ## Claims ### Claim 1 An imaging lens comprising a first lens element, a second lens element, a third lens element, and a fourth lens element arranged from an object side to an image side in the given order, each of the first, second, third, and fourth lens elements having 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 image-side surface of the first lens element comprises a concave portion in a vicinity of an optical axis of the imaging lens; the object-side surface of the third lens element comprises a concave portion in a vicinity of the optical axis; the object-side surface of the fourth lens element comprises a convex portion in a vicinity of the optical axis; and the imaging lens does not include any lens element with refractive power other than the first, second, third, and fourth lens elements, wherein the imaging lens satisfies 1.900≤ALT/(G34+T4)≤2.614, where ALT represents a sum of thicknesses of all four lens elements along the optical axis, G34 represents a distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element at the optical axis, and T4 represents a distance between the object-side surface and the image-side surface of the fourth lens element at the optical axis. ### Claim 2 (depends on 1) The imaging lens of claim 1, wherein the imaging lens further satisfies 0.882≤(G23+G34)/T4≤2.116, where G23 represents a distance between the image-side surface of the second lens element and the object-side surface of the third lens element at the optical axis. ### Claim 3 (depends on 1) The imaging lens of claim 1, wherein the imaging lens further satisfies 1.308≤(T1+G12+G34)/Gaa≤2.219, where T1 represents a distance between the object-side surface and the image-side surface of the first lens element at the optical axis, G12 represents a distance between the image-side surface of the first lens element and the object-side surface of the second lens element at the optical axis, and Gaa represents a sum of a distance between the image-side surface of the first lens element and the object-side surface of the second lens element at the optical axis, a distance between the image-side surface of the second lens element and the object-side surface of the third lens element at the optical axis, and a distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element at the optical axis. ### Claim 4 (depends on 1) The imaging lens of claim 1, wherein the imaging lens further satisfies 1.942≤(BFL+EFL)/ALT≤2.593, where BFL represents a distance between the image-side surface of the fourth lens element and an image plane of the imaging lens at the optical axis, and EFL represents a system focal length of the imaging lens. ### Claim 5 (depends on 1) The imaging lens of claim 1, wherein the imaging lens further satisfies 2.255≤(EFL+T1)/BFL≤3.278, where EFL represents a system focal length of the imaging lens, T1 represents a distance between the object-side surface and the image-side surface of the first lens element at the optical axis, and BFL represents a distance between the image-side surface of the fourth lens element and an image plane of the imaging lens at the optical axis. ### Claim 6 (depends on 1) The imaging lens of claim 1, wherein the imaging lens further satisfies 2.733≤ALT/T1≤3.311, where T1 represents a distance between the object-side surface and the image-side surface of the first lens element at the optical axis. ### Claim 7 (depends on 1) The imaging lens of claim 1, wherein the imaging lens further satisfies 1.417≤(Gaa+ALT)/BFL≤2.513, where Gaa represents a sum of a distance between the image-side surface of the first lens element and the object-side surface of the second lens element at the optical axis, a distance between the image-side surface of the second lens element and the object-side surface of the third lens element at the optical axis, and a distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element at the optical axis, and BFL represents a distance between the image-side surface of the fourth lens element and an image plane of the imaging lens at the optical axis. ### Claim 8 An imaging lens comprising a first lens element, a second lens element, a third lens element, and a fourth lens element arranged from an object side to an image side in the given order, each of the first, second, third, and fourth lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side, wherein: the image-side surface of the first lens element comprises a concave portion in a vicinity of an optical axis of the imaging lens; the second lens element has negative refractive power; the object-side surface of the third lens element comprises a concave portion in a vicinity of the optical axis; the object-side surface of the fourth lens element comprises a convex portion in a vicinity of the optical axis; and the imaging lens does not include any lens element with refractive power other than the first, second, third, and fourth lens elements, wherein the imaging lens satisfies 1.900≤ALT/(G34+T4)≤2.614, where ALT represents a sum of thicknesses of all four lens elements along the optical axis, G34 represents a distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element at the optical axis, and T4 represents a distance between the object-side surface and the image-side surface of the fourth lens element at the optical axis. ### Claim 9 (depends on 8) The imaging lens of claim 8, wherein the imaging lens further satisfies 2.831≤(ALT+T1)/T3≤5.843, where T1 represents a distance between the object-side surface and the image-side surface of the first lens element at the optical axis, and T3 represents a distance between the object-side surface and the image-side surface of the third lens element at the optical axis. ### Claim 10 (depends on 8) The imaging lens of claim 8, wherein the imaging lens further satisfies 1.733≤(T2+T3+T4)/T1≤2.311, where T1 represents a distance between the object-side surface and the image-side surface of the first lens element at the optical axis, T2 represents a distance between the object-side surface and the image-side surface of the second lens element at the optical axis, and T3 represents a distance between the object-side surface and the image-side surface of the third lens element at the optical axis. ### Claim 11 (depends on 8) The imaging lens of claim 8, wherein the imaging lens further satisfies 1.205≤(T1+G12)/(T2+G23)≤2.110, where T1 represents a distance between the object-side surface and the image-side surface of the first lens element at the optical axis, G12 represents a distance between the image-side surface of the first lens element and the object-side surface of the second lens element at the optical axis, T2 represents a distance between the object-side surface and the image-side surface of the second lens element at the optical axis, and G23 represents a distance between the image-side surface of the second lens element and the object-side surface of the third lens element at the optical axis. ### Claim 12 (depends on 8) The imaging lens of claim 8, wherein the imaging lens further satisfies 1.523≤BFL/Gaa≤3.327, where BFL represents a distance between the image-side surface of the fourth lens element and an image plane of the imaging lens at the optical axis, and Gaa represents a sum of a distance between the image-side surface of the first lens element and the object-side surface of the second lens element at the optical axis, a distance between the image-side surface of the second lens element and the object-side surface of the third lens element at the optical axis, and a distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element at the optical axis. ### Claim 13 (depends on 8) The imaging lens of claim 8, wherein the imaging lens further satisfies 2.365≤(ALT+G12)/Gaa≤4.650, where G12 represents a distance between the image-side surface of the first lens element and the object-side surface of the second lens element at the optical axis, and Gaa represents a sum of a distance between the image-side surface of the first lens element and the object-side surface of the second lens element at the optical axis, a distance between the image-side surface of the second lens element and the object-side surface of the third lens element at the optical axis, and a distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element at the optical axis. ### Claim 14 (depends on 8) The imaging lens of claim 8, wherein the imaging lens further satisfies 1.079≤(T1+T2+T4)/(T3+G34)≤2.174, where T1 represents a distance between the object-side surface and the image-side surface of the first lens element at the optical axis, T2 represents a distance between the object-side surface and the image-side surface of the second lens element at the optical axis, and T3 represents a distance between the object-side surface and the image-side surface of the third lens element at the optical axis. ### Claim 15 An imaging lens comprising a first lens element, a second lens element, a third lens element, and a fourth lens element arranged from an object side to an image side in the given order, each of the first, second, third, and fourth lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side, wherein: the image-side surface of the first lens element comprises a concave portion in a vicinity of an optical axis of the imaging lens; the object-side surface of the third lens element comprises a concave portion in a vicinity of the optical axis; the fourth lens element has positive refractive power; the object-side surface of the fourth lens element comprises a convex portion in a vicinity of the optical axis; and the imaging lens does not include any lens element with refractive power other than the first, second, third, and fourth lens elements, wherein the imaging lens satisfies 1.900≤ALT/(G34+T4)≤2.614, where ALT represents a sum of thicknesses of all four lens elements along the optical axis, G34 represents a distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element at the optical axis, and T4 represents a distance between the object-side surface and the image-side surface of the fourth lens element at the optical axis. ### Claim 16 (depends on 15) The imaging lens of claim 15, wherein the imaging lens further satisfies 2.699≤(BFL+Gaa)/(G12+T4)≤4.451, where BFL represents a distance between the image-side surface of the fourth lens element and an image plane of the imaging lens at the optical axis, Gaa represents a sum of a distance between the image-side surface of the first lens element and the object-side surface of the second lens element at the optical axis, a distance between the image-side surface of the second lens element and the object-side surface of the third lens element at the optical axis, and a distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element at the optical axis, and G12 represents a distance between the image-side surface of the first lens element and the object-side surface of the second lens element at the optical axis. ### Claim 17 (depends on 15) The imaging lens of claim 15, wherein the imaging lens further satisfies 3.525≤EFL/Gaa≤6.481, where EFL represents a system focal length of the imaging lens, and Gaa represents a sum of a distance between the image-side surface of the first lens element and the object-side surface of the second lens element at the optical axis, a distance between the image-side surface of the second lens element and the object-side surface of the third lens element at the optical axis, and a distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element at the optical axis. ### Claim 18 (depends on 15) The imaging lens of claim 15, wherein the imaging lens further satisfies 1.451≤(BFL+T1)/(T2+G34)≤2.737, where BFL represents a distance between the image-side surface of the fourth lens element and an image plane of the imaging lens at the optical axis, T1 represents a distance between the object-side surface and the image-side surface of the first lens element at the optical axis, and T2 represents a distance between the object-side surface and the image-side surface of the second lens element at the optical axis. ### Claim 19 (depends on 15) The imaging lens of claim 15, wherein the imaging lens further satisfies 3.112≤EFL/(G23+T3)≤4.837, where EFL represents a system focal length of the imaging lens, G23 represents a distance between the image-side surface of the second lens element and the object-side surface of the third lens element at the optical axis, and T3 represents a distance between the object-side surface and the image-side surface of the third lens element at the optical axis. ### Claim 20 (depends on 15) The imaging lens of claim 15, wherein the imaging lens further satisfies 1.740≤(ALT+G12)/(G34+Gaa)≤3.550, where G12 represents a distance between the image-side surface of the first lens element and the object-side surface of the second lens element at the optical axis, and Gaa represents a sum of a distance between the image-side surface of the first lens element and the object-side surface of the second lens element at the optical axis, a distance between the image-side surface of the second lens element and the object-side surface of the third lens element at the optical axis, and a distance between the image-side surface of the third lens element and the object-side surface of the fourth lens element at the optical axis.