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CN-117687180-B - Wide-angle lens

CN117687180BCN 117687180 BCN117687180 BCN 117687180BCN-117687180-B

Abstract

A wide-angle lens includes first, second, third, fourth and fifth lenses. The first lens has negative refractive power and comprises a concave surface facing the image side, the second, third and fourth lenses have refractive power, the fourth lens comprises a convex surface facing the image side, and the fifth lens has positive refractive power. The first, second, third, fourth and fifth lenses are arranged in order from the object side to the image side along the optical axis. Wherein the wide-angle lens meets at least one of the following conditions that HIH/f is more than or equal to 0.8 and less than or equal to 1.0, TTL/HIH is more than or equal to 10.9 and less than or equal to 12.1, R12/f is more than or equal to 1.4 and less than or equal to 2.0, R42/f is more than or equal to-7 and less than or equal to-4, f is the effective focal length of the wide-angle lens, HIH is the half image height of the wide-angle lens, TTL is the distance from the object side surface to the imaging surface of the first lens on the optical axis, R12 is the curvature radius of the image side surface of the first lens, and R42 is the curvature radius of the image side surface of the fourth lens.

Inventors

  • SUN JIAHONG
  • LI JIANWEI

Assignees

  • 信泰光学(深圳)有限公司
  • 亚洲光学股份有限公司

Dates

Publication Date
20260512
Application Date
20220905

Claims (9)

  1. 1. A wide-angle lens, comprising: The first lens has negative refractive power and comprises a concave surface facing the image side; the second lens has positive refractive power and comprises a convex surface facing the image side; the third lens has refractive power; the fourth lens has positive refractive power and comprises a convex surface facing the image side The fifth lens has positive refractive power and comprises a convex surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are sequentially arranged from the object side to the image side along an optical axis; Wherein the wide angle lens meets at least one of the following conditions: 0.8 ≤ HIH/f ≤ 1.0; 10.9 ≤ TTL/HIH ≤ 12.1; 1.4 ≤ R12/f ≤ 2.0; -7 ≤ R42/f ≤ -4; Wherein f is the effective focal length of the wide-angle lens, HIH is the half-image height of the wide-angle lens, TTL is the distance between the object side surface of the first lens element and the imaging surface on the optical axis, R12 is the radius of curvature of the image side surface of the first lens element, and R42 is the radius of curvature of the image side surface of the fourth lens element.
  2. 2. The wide-angle lens of claim 1, wherein the third lens is a meniscus lens having positive refractive power.
  3. 3. The wide-angle lens of claim 2, wherein: The first lens is a meniscus lens and further comprises a convex surface facing the object side, and The second lens comprises a concave surface facing the object side.
  4. 4. A wide-angle lens as set forth in claim 3, wherein: the third lens includes a concave surface facing the object side and a convex surface facing the image side The fifth lens comprises a concave surface facing the image side.
  5. 5. A wide-angle lens as set forth in claim 3, wherein: The third lens includes a convex surface facing the object side and a concave surface facing the image side The fifth lens comprises a convex surface facing the image side.
  6. 6. The wide-angle lens of claim 1, wherein the third lens has negative refractive power and comprises a concave surface facing the object side.
  7. 7. The wide-angle lens of claim 6, wherein: The first lens is a biconcave lens and further comprises another concave surface facing the object side; The second lens includes a convex surface facing the object side, and The fifth lens comprises a convex surface facing the image side.
  8. 8. The wide-angle lens of claim 6, wherein: The first lens is a meniscus lens and further comprises a convex surface facing the object side; The second lens comprises a concave surface facing the object side; the third lens is a biconcave lens and further comprises another concave surface facing the image side; the fourth lens is a biconvex lens and further comprises another convex surface facing the object side, and The fifth lens comprises a concave surface facing the image side.
  9. 9. The wide-angle lens of any one of claims 1 to 8, further comprising an aperture stop disposed between the first lens and the third lens, the wide-angle lens satisfying at least one of the following conditions: 1.04 ≤ dsi/f5 ≤ 1.91; -2.2 ≤ f1/f ≤ -1.8; 3.2 ≤ f5/f ≤ 6.1; Wherein dsi is the distance between the aperture stop and the imaging plane on the optical axis, f is the effective focal length of the wide-angle lens, f1 is the effective focal length of the first lens, and f5 is the effective focal length of the fifth lens.

Description

Wide-angle lens Technical Field The invention relates to a wide-angle lens. Background In addition to the continuous development of wide-angle lenses towards large fields of view, the present wide-angle lenses have to have large aperture and high resolution characteristics according to different application requirements, and the present wide-angle lenses cannot meet the present requirements, and a wide-angle lens with another new architecture is required to meet the requirements of large field of view, large aperture and high resolution. Disclosure of Invention The invention aims to solve the technical problem that the wide-angle lens in the prior art cannot meet the requirements of large field of view, large aperture and high resolution, and provides the wide-angle lens which has larger field of view, smaller aperture value and higher resolution, but still has good optical performance. The invention provides a wide-angle lens which comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has negative refractive power and includes a concave surface facing the image side, the second lens has refractive power, the third lens has refractive power, the fourth lens has refractive power and includes a convex surface facing the image side, and the fifth lens has positive refractive power. The first lens, the second lens, the third lens, the fourth lens and the fifth lens are sequentially arranged from the object side to the image side along the optical axis. Wherein the wide angle lens satisfies at least one condition that HIH/f is more than or equal to 0.8 and less than or equal to 1.0, TTL/HIH is more than or equal to 10.9 and less than or equal to 12.1, R12/f is more than or equal to 1.4 and less than or equal to 2.0, R42/f is more than or equal to-4, f is the effective focal length of the wide angle lens, HIH is the half image height of the wide angle lens, TTL is the distance from the object side surface to the imaging surface of the first lens on the optical axis, R12 is the curvature radius of the image side surface of the first lens, and R42 is the curvature radius of the image side surface of the fourth lens. When the wide-angle lens of the present invention meets the above characteristics and conditions, the basic functions of the wide-angle lens of the present invention can be achieved without additional characteristics or conditions. Wherein the third lens is a meniscus lens having positive refractive power. The first lens is a meniscus lens and can further comprise a convex surface facing the object side, and the second lens comprises a concave surface facing the object side. The third lens element has a concave surface facing the object side and a convex surface facing the image side, and the fifth lens element has a concave surface facing the image side. The third lens element has a convex surface facing the object side and a concave surface facing the image side, and the fifth lens element has a convex surface facing the image side. The third lens has negative refractive power and comprises a concave surface facing the object side. The first lens is a biconcave lens and can further comprise another concave surface facing the object side, the second lens comprises a convex surface facing the object side, and the fifth lens comprises a convex surface facing the image side. The first lens element may further include a convex surface facing the object side, the second lens element may include a concave surface facing the object side, the third lens element may further include another concave surface facing the image side, the fourth lens element may further include another convex surface facing the object side, and the fifth lens element may include a concave surface facing the image side. The second lens has positive refractive power and includes a convex surface facing the image side, the fourth lens has positive refractive power, and the fifth lens includes a convex surface facing the object side. The wide-angle lens of the invention can further comprise an aperture arranged between the first lens and the third lens, wherein the wide-angle lens meets at least one of the following conditions that dsi/f5 is less than or equal to 1.04 and less than or equal to 1.91, f1/f is less than or equal to-2.2 and less than or equal to-1.8, and f5/f is less than or equal to 3.2 and less than or equal to 6.1, wherein dsi is the distance between the aperture and the imaging surface on the optical axis, f is the effective focal length of the wide-angle lens, f1 is the effective focal length of the first lens, and f5 is the effective focal length of the fifth lens. The wide-angle lens has the advantages of larger field of view, smaller aperture value and higher resolution, but still has good optical performance. Drawings Fig. 1 is a schematic view of a lens configuration and an optical path of a first embodiment of a wide-angle lens according to the present invention. Fig. 2