CN-224216937-U - Imaging lens system

Abstract

The imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens that are disposed in order from an object side of the imaging lens system toward an imaging surface of the imaging lens system along an optical axis of the imaging lens system, wherein the second lens has a positive refractive power and is made of a glass material, the fifth lens is made of a plastic material, and the imaging lens system satisfies a conditional expression f-number <2.10, wherein the f-number is an f-number of the imaging lens system.

Inventors

• ZHAO ZHUYAN
• SUN ZHUHE

Assignees

• 三星电机株式会社

Dates

Publication Date

20260508

Application Date

20250519

Priority Date

20240923

Claims (20)

1. 1. An imaging lens system, wherein the imaging lens system comprises: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in this order along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging surface of the imaging lens system, Wherein the second lens has positive refractive power and is made of a glass material, The fifth lens is made of plastic material, and The imaging lens system satisfies the following conditional expression: f-number <2.10 Wherein f-number is the f-number of the imaging lens system.
2. 2. The imaging lens system of claim 1 wherein said first lens has a negative refractive power.
3. 3. The imaging lens system of claim 1 wherein said first lens has a concave object-side surface in a paraxial region thereof.
4. 4. The imaging lens system of claim 1 wherein said second lens has a convex object side in a paraxial region thereof.
5. 5. The imaging lens system of claim 1 wherein said third lens has a convex object side in a paraxial region thereof.
6. 6. The imaging lens system of claim 1 wherein said fourth lens has a concave object-side surface in a paraxial region thereof.
7. 7. The imaging lens system of claim 1 wherein said fifth lens has a negative refractive power.
8. 8. The imaging lens system of claim 1 wherein said fifth lens has a convex object side in its paraxial region.
9. 9. The imaging lens system of claim 1, wherein the imaging lens system satisfies the following conditional expression: 2.0<f1/f5<20.0 Where f1 is the focal length of the first lens and f5 is the focal length of the fifth lens.
10. 10. An imaging lens system, wherein the imaging lens system comprises: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in this order along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging surface of the imaging lens system, Wherein the first lens has a negative refractive power, The first lens has a convex image side in its paraxial region, or the third lens has a convex image side in its paraxial region, and The imaging lens system satisfies the following conditional expression: 4.0<(R3+R5)/R10<8.0 Where R3 is a radius of curvature of an object-side surface of the second lens at the optical axis, R5 is a radius of curvature of an object-side surface of the third lens at the optical axis, and R10 is a radius of curvature of an image-side surface of the fifth lens at the optical axis.
11. 11. The imaging lens system of claim 10 wherein said first lens has a concave object-side surface in a paraxial region thereof.
12. 12. The imaging lens system of claim 10 wherein said second lens has positive refractive power.
13. 13. The imaging lens system of claim 10 wherein said second lens has a convex object side in a paraxial region thereof.
14. 14. The imaging lens system of claim 10 wherein said third lens has a convex object side in a paraxial region thereof.
15. 15. The imaging lens system of claim 10 wherein said fourth lens has a concave object-side surface in a paraxial region thereof.
16. 16. The imaging lens system of claim 10 wherein said fifth lens has a negative refractive power.
17. 17. The imaging lens system of claim 10 wherein said fifth lens has a convex object side in its paraxial region.
18. 18. The imaging lens system of claim 10, wherein the imaging lens system satisfies the following conditional expression: -10.0<f1/f2<-1.0 where f1 is the focal length of the first lens and f2 is the focal length of the second lens.
19. 19. The imaging lens system of claim 10, wherein the imaging lens system satisfies the following conditional expression: -3.0<f1/f3<2.0 Where f1 is the focal length of the first lens and f3 is the focal length of the third lens.
20. 20. The imaging lens system of claim 10, wherein the imaging lens system satisfies the following conditional expression: 2.0<f1/f5<20.0 Where f1 is the focal length of the first lens and f5 is the focal length of the fifth lens.

Description

Imaging lens system Cross Reference to Related Applications The present application claims the priority rights of korean patent application No. 10-2024-0128242 filed in the korean intellectual property office on day 9 and 23 of 2024, the entire disclosure of which is incorporated herein by reference for all purposes. Technical Field The present disclosure relates to an imaging lens system capable of minimizing a phenomenon in which incident light in a peripheral portion of an optical axis is reduced. Background The miniature monitoring camera may be configured to capture image information within a monitored area. For example, a small monitoring camera may be mounted on a front bumper, a rear bumper, or other portion of a vehicle, and may provide a captured image to a driver. Early miniature monitoring cameras were designed to capture images of obstacles adjacent to the vehicle and therefore not only had relatively low resolution, but also had a large variation in resolution according to temperature variations between-40 ℃ and 80 ℃. In order to solve such a problem, a small-sized monitoring camera includes a lens made of a glass material. However, it may be difficult for the glass material lens to achieve an incident light angle required for the image sensor of the camera module, which results in a light reduction phenomenon at the peripheral portion of the optical axis. Disclosure of utility model This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. In one general aspect, an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side of the imaging lens system toward an imaging surface of the imaging lens system along an optical axis of the imaging lens system, wherein the second lens has a positive refractive power and is made of a glass material, the fifth lens is made of a plastic material, and the imaging lens system satisfies a conditional expression f-number <2.10, wherein the f-number is an f-number of the imaging lens system. The first lens may have a negative refractive power. The first lens may have a concave object side in its paraxial region. The second lens may have a convex object side in its paraxial region. The third lens may have a convex object side in its paraxial region. The fourth lens may have a concave object-side surface in its paraxial region. The fifth lens may have a negative refractive power. The fifth lens may have a convex object side in its paraxial region. The imaging lens system may satisfy the conditional expression 2.0< f1/f5<20.0, where f1 is a focal length of the first lens and f5 is a focal length of the fifth lens. In another general aspect, an imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side of the imaging lens system toward an imaging surface of the imaging lens system along an optical axis of the imaging lens system, wherein the first lens has a negative refractive power and has a convex image side in a paraxial region thereof, the third lens has a convex image side in a paraxial region thereof, and the imaging lens system satisfies conditional expressions 4.0< (r3+r5)/r10 <8.0, wherein R3 is a radius of curvature of the object side of the second lens at the optical axis, R5 is a radius of curvature of the object side of the third lens at the optical axis, and R10 is a radius of curvature of the image side of the fifth lens at the optical axis. The first lens may have a concave object side in its paraxial region. The second lens may have positive refractive power. The second lens may have a convex object side in its paraxial region. The third lens may have a convex object side in its paraxial region. The fourth lens may have a concave object-side surface in its paraxial region. The fifth lens may have a negative refractive power. The fifth lens may have a convex object side in its paraxial region. The imaging lens system may satisfy the conditional expression-10.0 < f1/f2< -1.0, where f1 is the focal length of the first lens and f2 is the focal length of the second lens. The imaging lens system may satisfy the conditional expression-3.0 < f1/f3<2.0, where f1 is the focal length of the first lens and f3 is the focal length of the third lens. The imaging lens system may satisfy the conditional expression 2.0< f1/f5<20.0, where f1 is a focal length of the first lens and f5 is a focal length of the fifth lens. Other features and aspects will be apparent from the accompanying drawings and from the detailed description that follows. Drawings Fig. 1 is a configuration diagram of an imaging lens system according