CN-122018118-A - Optical imaging lens

CN122018118ACN 122018118 ACN122018118 ACN 122018118ACN-122018118-A

Abstract

The application discloses an optical imaging lens, wherein the inner diameter d02m of the image side end surface of a second lens barrel is 2.85< d02m/EPD (E-D) of the optical imaging lens is less than or equal to 3.20, the combined focal length f34 of a third lens and a fourth lens is 56.65< f34/T34<65.45 between an air gap T34 on an optical axis of the third lens and the fourth lens, the interval distance EP12 between a first interval element and a second interval element along the optical axis direction is the interval distance EP23 between the second interval element and the third interval element along the optical axis direction, and the interval distance EP34 between the third interval element and the fourth interval element along the optical axis direction is 1.45< (EP 12+EP 23)/EP 34<2.00. The optical imaging lens can realize the balance of a light and thin structure and high imaging quality, and effectively improve the optical performance.

Inventors

DING MINGHAO
LIU BINGHUI
YU YANG
DING XIANCUI
HE LINGBO

Assignees

浙江舜宇光学有限公司

Dates

Publication Date: 20260512
Application Date: 20260304

Claims (13)

1. An optical imaging lens, characterized by comprising a second barrel, a lens group arranged in the second barrel, and a plurality of spacing elements; The lens group sequentially comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, and a fifth lens with negative focal power from the object side to the image side along the optical axis of the optical imaging lens; The air gap between the fourth lens and the fifth lens on the optical axis is larger than the sum of the air gaps between other adjacent lenses in the lens group on the optical axis; The plurality of spacer elements includes a first spacer element disposed on the first lens image side and in contact with the first lens image side, a second spacer element disposed on the second lens image side and in contact with the second lens image side, a third spacer element disposed on the third lens image side and in contact with the third lens image side, and a fourth spacer element disposed on the fourth lens image side and in contact with the fourth lens image side; The inner diameter d02m of the image side end surface of the second lens barrel, and the entrance pupil diameter EPD of the optical imaging lens is 2.85< d02m/EPD less than or equal to 3.20; A combined focal length f34 of the third lens and the fourth lens, the third lens and the fourth lens satisfying 56.65< f34/T34<65.45 between air gaps T34 on an optical axis; The spacing distance EP12 between the first spacing element and the second spacing element along the optical axis direction, the spacing distance EP23 between the second spacing element and the third spacing element along the optical axis direction, and the spacing distance EP34 between the third spacing element and the fourth spacing element along the optical axis direction satisfy 1.45< (EP 12+EP 23)/EP 34<2.00.
2. The optical imaging lens of claim 1, further comprising a first barrel disposed on an object side of the first lens and an autofocus assembly disposed therein, the autofocus assembly having a variable curvature surface; The object side end far shaft position of the second lens barrel is provided with a stepped surface, and the first lens barrel and the second lens barrel are supported by the stepped surface.
3. The optical imaging lens of claim 2, wherein the second spacer element image side surface is in contact with the third lens object side surface; an outer diameter D2m of the second spacing element image side surface, an inner diameter D2m of the second spacing element image side surface satisfying 2.15< D2m/D2m <2.60; The outer diameter D3s of the third spacer element side surface is 1.95-2.45, and the inner diameter D3s of the third spacer element side surface is 1.95-3 s/D3 s.
4. The optical imaging lens according to claim 2, wherein a maximum height L2 of the second barrel, an air gap T45 between the fourth lens and the fifth lens on an optical axis, is 3.35< L2/T45 is equal to or less than 4.5.
5. The optical imaging lens of claim 4, wherein an effective focal length f1 of the first lens and an effective focal length f2 of the second lens satisfy 1.45< (f1+|f2|)/f <1.70; The maximum height L2 of the second lens barrel, the spacing distance EP01 from the object side end surface of the second lens barrel to the object side surface of the first spacing element along the optical axis direction, and the spacing distance EP12 between the first spacing element and the second spacing element along the optical axis direction satisfies 2.60< L2/(EP 01+EP 12) <3.70.
6. The optical imaging lens according to claim 1 or 2, wherein an air gap T45 on an optical axis between the fourth lens and the fifth lens, and an air gap T34 on an optical axis between the third lens and the fourth lens satisfy 10.05< T45/T34 is equal to or less than 13.65; the spacing distance EP34 between the third spacing element and the fourth spacing element along the optical axis direction is 1.40< EP34/EP23<2.10, and the spacing distance EP23 between the second spacing element and the third spacing element along the optical axis direction is satisfied.
7. The optical imaging lens according to claim 2, wherein a spacing distance EP12 between the first spacing element and the second spacing element in the optical axis direction, an air gap T12 between the first lens and the second lens on the optical axis, and an air gap T23 between the second lens and the third lens on the optical axis satisfy 1.85< EP 12/(t12+t23) +.3.35.
8. The optical imaging lens as claimed in claim 2, wherein the combined focal length f12 of the first lens and the second lens, the inner diameter d1s of the first spacer element side, and the inner diameter d2s of the second spacer element side satisfy 2.05< f 12/(d1s+d2s). Ltoreq.2.45.
9. The optical imaging lens as claimed in claim 3, wherein an effective focal length f3 of the third lens and an effective focal length f2 of the second lens satisfy-1.25 < f3/f2< -0.85; the outer diameter D3s of the third spacer element object side surface and the outer diameter D2m of the second spacer element image side surface satisfy 0.95< D3s/D2m <1.25.
10. The optical imaging lens as claimed in claim 2, wherein an effective focal length f4 of the fourth lens and an effective focal length f3 of the third lens satisfy-8.00 < f4/f3< -3.65; the maximum outer diameter OD4 of the fourth lens and the maximum outer diameter OD3 of the third lens meet that 1.10< OD4/OD3 is less than or equal to 1.25.
11. The optical imaging lens as claimed in claim 2, wherein an outer diameter D02s of the object side end surface of the second barrel, a maximum outer diameter OD1 of the first lens, and an effective radius DT11 of the first lens satisfy 2.15< D02 s/(OD 1-DT11 x 2) <3.05.
12. An optical imaging lens as claimed in claim 3, wherein a distance EP23 between the second spacing element and the third spacing element in the optical axis direction is 1.95< EP23/ED3<3.05 between an image side effective radius vertex of the third lens element and a distance ED3 between an object side effective radius vertex of the fourth lens element in the optical axis direction.
13. The optical imaging lens according to claim 1 or 2, wherein an air gap T45 on an optical axis between the fourth lens and the fifth lens, the fourth spacing element satisfies 1.75< T45/CP4<2.10 between a maximum thickness CP4 in an optical axis direction.

Description

Optical imaging lens Technical Field The present application relates generally to the technical field of optical imaging devices. More particularly, the present application relates to an optical imaging lens. Background With the rapid development of the augmented reality and virtual reality technologies, the optical imaging system of the optical imaging system needs to meet the requirements of large visual angle, high resolution, low distortion and high imaging quality, and the wearing equipment has severe limitations on small size and light weight, so that the requirements of the traditional optical design are difficult to meet. In the prior art, the front lens is designed with a fixed focal length, so that dynamic focusing cannot be realized, and the flexibility of a used scene is limited. In order to realize the zooming function, the conventional zooming module often needs seven or more lenses, which directly leads to the total length of the lenses exceeding the standard, and is difficult to adapt to the requirements of the wearable device on small volume and light weight. Meanwhile, the traditional lens is insufficient in parasitic light inhibition capability, and excessive parasitic light is easy to interfere with an imaging process to influence imaging definition. In order to achieve both miniaturization and imaging quality, some designs attempt to achieve miniaturization by compressing the lens space. However, the lens, which performs the core aberration correction function, is sensitive to assembly errors and environmental temperature and humidity changes due to limited space. Minor deviations or thermal expansions in the assembly may destroy the aberration correction state of the optical imaging system, resulting in serious degradation of the lens modulation transfer function performance and insufficient stability, which makes it difficult to ensure continuous high imaging quality. In view of the foregoing, it is desirable to provide an optical imaging lens that is capable of achieving a balance between a light and thin structure and high imaging quality, and effectively improving optical performance. Disclosure of Invention In order to solve at least one or more of the technical problems mentioned above, the present application proposes an optical imaging lens capable of realizing a light and thin structure and high imaging quality in the following aspects. In a first aspect, the present application provides an optical imaging lens including a second barrel and a lens group and a plurality of spacer elements provided in the second barrel; the lens group sequentially comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, and a fifth lens with negative focal power from the object side to the image side along the optical axis of the optical imaging lens; the air gap between the fourth lens and the fifth lens on the optical axis is larger than the sum of the air gaps between other adjacent lenses in the lens group on the optical axis; the plurality of spacer elements including a first spacer element, a second spacer element, a third spacer element and a fourth spacer element, the first spacer element being disposed on the first lens image side and in contact with the first lens image side, the second spacer element being disposed on the second lens image side and in contact with the second lens image side, the third spacer element being disposed on the third lens image side and in contact with the third lens image side, the fourth spacer element being disposed on the fourth lens image side and in contact with the fourth lens image side, the second lens barrel image side end surface inner diameter d02m, the entrance pupil diameter EPD of the optical imaging lens satisfying a combined focal length f34 of 2.85< d02 m/epd≤3.20, the third lens satisfying a combined focal length f34 between the third lens and the fourth lens, an air gap T34 on the optical axis between the third lens and the fourth lens satisfying 56.65< f 34/T65.45, the first spacer element and the second spacer element satisfying a distance between the third spacer element and the fourth spacer element in the EP23 along the third lens image side and the second spacer element in the EP 12-optical axis direction, the spacing distance EP34 between the third spacing element and the fourth spacing element along the optical axis direction is 1.45< (EP 12+EP 23)/EP 34<2.00. In some embodiments, the optical imaging lens further comprises a first lens barrel arranged on the object side of the first lens and an automatic focusing component arranged in the first lens barrel, wherein the automatic focusing component is provided with a curvature variable surface, the second lens barrel is provided with a stepped surface close to the object side, and the first lens barrel and the second lens barrel are supported by the stepped surface. In