# US 11,079,569 B2 · Wide-angle lens assembly > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,079,569 B2 - Document ID: US11079569B2 - Status: Granted - Kind: B2 - Application number: 15/972,332 - Filed: 2018-05-07 - Published: 2019-01-31 - Granted: 2021-08-03 - Earliest claimed: 2017-07-31 - Assignees: Sintai Optical (Shenzhen) Co., Ltd.; Asia Optical Co., Inc. - Applicants: Sintai Optical (Shenzhen) Co., Ltd.; Asia Optical Co., Inc. - Inventors: An-Kai Chang - Web page: https://patentgrep.com/patent/US11079569B2 ## CPC - G02B 9/60: having five components only - G02B 9/34: having four components only - G02B 13/04: Reversed telephoto objectives - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A wide-angle lens assembly includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are arranged in order from an object side to an image side along an optical axis. The first lens is a meniscus lens with negative refractive power. The second lens is with positive refractive power and includes a convex surface facing the object side. The third lens is with positive refractive power and includes a convex surface facing the image side. The fourth lens is with positive refractive power and includes a convex surface facing the object side. The fifth lens is with negative refractive power and includes a concave surface facing the object side and a convex surface facing the image side. ## Claims ### Claim 1 A wide-angle lens assembly comprising: a first lens which is a meniscus lens with negative refractive power; a second lens which is with positive refractive power and comprises a convex surface facing an object side; a third lens which is with positive refractive power and comprises a convex surface facing an image side; a fourth lens which is with positive refractive power and comprises a convex surface facing the object side; and a fifth lens which is with negative refractive power and comprises a concave surface facing the object side and a convex surface facing the image side; wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are arranged in order from the object side to the image side along an optical axis; wherein the wide-angle lens assembly satisfies: AAG/TTL≥0.55, Nd3−Nd4≥0.23, 1.2≤|f1/f|≤1.6, wherein AAG is a total air interval from the first lens to an image plane along the optical axis, TTL is an interval from an object side surface of the first lens to the image plane along the optical axis, Nd3 is an index of refraction of the third lens, Nd4 is an index of refraction of the fourth lens, f1 is an effective focal length of the first lens, and f is an effective focal length of the wide-angle lens assembly. ### Claim 2 (depends on 1) The wide-angle lens assembly as claimed in claim 1, wherein the first lens further comprises a convex surface facing the object side and the fourth lens further comprises a convex surface facing the image side. ### Claim 3 (depends on 1) The wide-angle lens assembly as claimed in claim 1, wherein the wide-angle lens assembly satisfies: Vd1+Vd2≤90, wherein Vd1 is an Abbe number of the first lens and Vd2 is an Abbe number of the second lens. ### Claim 4 (depends on 1) The wide-angle lens assembly as claimed in claim 1, wherein the wide-angle lens assembly satisfies: 0.9≤f2/f3≤1.3, wherein f2 is an effective focal length of the second lens and f3 is an effective focal length of the third lens. ### Claim 5 (depends on 1) The wide-angle lens assembly as claimed in claim 1, wherein the fourth lens and the fifth lens are cemented and the wide-angle lens assembly further comprises a stop disposed between the first lens and the second lens. ### Claim 6 (depends on 1) The wide-angle lens assembly as claimed in claim 1, wherein the wide-angle lens assembly satisfies: Vd4−Vd3≥20, wherein Vd3 is an Abbe number of the third lens and Vd4 is an Abbe number of the fourth lens. ### Claim 7 (depends on 6) The wide-angle lens assembly as claimed in claim 6, wherein the wide-angle lens assembly satisfies: 0.28≤BFL/TTL≤0.38, wherein BFL is an interval from the convex surface of the fifth lens to the image plane along the optical axis. ### Claim 8 (depends on 1) The wide-angle lens assembly as claimed in claim 1 wherein the first lens comprises a concave surface facing the image side, the second lens further comprises a concave surface facing the image side, the third lens further comprises a convex surface facing the object side, and the fourth lens further comprises a convex surface facing the image side. ### Claim 9 (depends on 8) The wide-angle lens assembly as claimed in claim 8, wherein the wide-angle lens assembly satisfies: Vd1+Vd2≥90, wherein Vd1 is an Abbe number of the first lens and Vd2 is an Abbe number of the second lens. ### Claim 10 (depends on 9) The wide-angle lens assembly as claimed in claim 9, wherein the wide-angle lens assembly satisfies: 0.9≤f2/f3≤1.3, wherein f2 is an effective focal length of the second lens and f3 is an effective focal length of the third lens. ### Claim 11 (depends on 8) The wide-angle lens assembly as claimed in claim 8, wherein the wide-angle lens assembly satisfies: 0.28≤BFL/TTL≤0.38, wherein BFL is an interval from the convex surface of the fifth lens to the image plane along the optical axis. ### Claim 12 (depends on 11) The wide-angle lens assembly as claimed in claim 11, wherein the fourth lens and the fifth lens are cemented and the wide-angle lens assembly further comprises a stop disposed between the first lens and the second lens. ### Claim 13 A wide-angle lens assembly comprising: a first lens which is a meniscus lens with negative refractive power; a second lens which is with positive refractive power and comprises a convex surface facing an object side; a third lens which is with positive refractive power and comprises a convex surface facing an image side; a fourth lens which is with positive refractive power and comprises a convex surface facing the object side; and a fifth lens which is with negative refractive power and comprises a concave surface facing the object side and a convex surface facing the image side; wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are arranged in order from the object side to the image side along an optical axis; wherein the wide-angle lens assembly satisfies: AAG/TTL≥0.55, Vd4−Vd3≥20, 1.2≤|f1/f|≤1.6, wherein AAG is a total air interval from the first lens to an image plane along the optical axis, TTL is an interval from an object side surface of the first lens to the image plane along the optical axis, Vd3 is an Abbe number of the third lens, Vd4 is an Abbe number of the fourth lens, f1 is an effective focal length of the first lens, and f is an effective focal length of the wide-angle lens assembly. ### Claim 14 (depends on 13) The wide-angle lens assembly as claimed in claim 13, wherein the wide-angle lens assembly satisfies: Nd3−Nd4≥0.23, wherein Nd3 is an index of refraction of the third lens and Nd4 is an index of refraction of the fourth lens. ### Claim 15 A wide-angle lens assembly comprising: a first lens which is a meniscus lens with negative refractive power; a second lens which is with positive refractive power and comprises a convex surface facing an object side; a third lens which is with positive refractive power and comprises a convex surface facing an image side; a fourth lens which is with positive refractive power and comprises a convex surface facing the object side; and a fifth lens which is with negative refractive power and comprises a concave surface facing the object side and a convex surface facing the image side; wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are arranged in order from the object side to the image side along an optical axis; wherein the wide-angle lens assembly satisfies: Nd3−Nd4≥0.23, 0.9≤f2/f3≤1.3, 1.2≤|f1/f|≤1.6, wherein Nd3 is an index of refraction of the third lens, Nd4 is an index of refraction of the fourth lens, f is an effective focal length of the wide-angle lens assembly, f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, and f3 is an effective focal length of the third lens. ### Claim 16 (depends on 15) The wide-angle lens assembly as claimed in claim 15, wherein the wide-angle lens assembly satisfies: AAG/TTL≥0.55, wherein AAG is a total air interval from the first lens to an image plane along the optical axis and TTL is an interval from an object side surface of the first lens to the image plane along the optical axis. ### Claim 17 (depends on 15) The wide-angle lens assembly as claimed in claim 15, wherein the first lens further comprises a convex surface facing the object side and the fourth lens further comprises a convex surface facing the image side. ### Claim 18 (depends on 15) The wide-angle lens assembly as claimed in claim 15, wherein the wide-angle lens assembly satisfies: Vd4−Vd3≥20, wherein Vd3 is an Abbe number of the third lens and Vd4 is an Abbe number of the fourth lens. ### Claim 19 (depends on 15) The wide-angle lens assembly as claimed in claim 15, wherein the fourth lens and the fifth lens are cemented and the wide-angle lens assembly further comprises a stop disposed between the first lens and the second lens.