Optical imaging lens

Abstract

An optical imaging lens including a first, a second, a third and a fourth lens element sequentially along an optical axis from an object-side to an image-side is provided. The first to the fourth lens element each includes an object-side surface facing toward the object-side and allowing an imaging ray to pass through as well as an image-side facing toward the image-side and allowing the imaging rays to pass through. Wherein an optical axis region of the image-side surface of the third lens element is concave, a periphery region of the object-side surface of the fourth lens element is convex, an optical axis region of the image-side surface of the fourth lens element is concave, a periphery region of the image-side surface of the fourth lens element is convex, and the lens elements of the optical imaging lens has only the four lens elements.

Claims

1. An optical imaging lens, comprising, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, and a fourth lens, wherein each of the first to fourth lenses includes an object-side surface facing the object side and through which an imaging ray passes, and an image-side surface facing the image side and through which the imaging ray passes; an optical axis region of the image-side surface of the second lens is concave; an optical axis region of the image-side surface of the third lens is concave; a circumferential region of the object-side surface of the fourth lens is convex; an optical axis region of the image-side surface of the fourth lens is concave; and a circumferential region of the image-side surface of the fourth lens is convex; wherein, The optical imaging lens has only the four lenses mentioned above, and satisfies the following condition: EPD / AAG≥2.500, where EPD is the entrance pupil diameter of the optical imaging lens, and AAG is the sum of the three air gaps of the first lens to the fourth lens on the optical axis.

2. An optical imaging lens, comprising, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, and a fourth lens, wherein each of the first to fourth lenses includes an object-side surface facing the object side and through which an imaging ray passes, and an image-side surface facing the image side and through which the imaging ray passes; a circumferential region of the object-side surface of the third lens is convex; an optical axis region of the image-side surface of the third lens is concave; a circumferential region of the object-side surface of the fourth lens is convex; an optical axis region of the image-side surface of the fourth lens is concave; and a circumferential region of the image-side surface of the fourth lens is convex; wherein, The optical imaging lens has only the four lenses mentioned above and satisfies the following condition: EPD / (AAG+BFL)≥1.000, where EPD is the entrance pupil diameter of the optical imaging lens, AAG is the sum of the three air gaps on the optical axis from the first lens to the fourth lens, and BFL is the distance from the image side of the fourth lens to an imaging surface on the optical axis.

3. An optical imaging lens, comprising, sequentially from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, and a fourth lens, wherein each of the first to fourth lenses includes an object-side surface facing the object side and through which an imaging ray passes, and an image-side surface facing the image side and through which the imaging ray passes; a circumferential region of the object-side surface of the third lens is convex; an optical axis region of the image-side surface of the fourth lens is concave; and a circumferential region of the image-side surface of the fourth lens is convex; wherein, The optical imaging lens has only the four lenses mentioned above and satisfies the following condition: EPD / ImgH≥2.600, where EPD is the entrance pupil diameter of the optical imaging lens and ImgH is the maximum image height of the optical imaging lens.

4. The optical imaging lens as claimed in any one of claims 1 and 2, wherein the optical imaging lens further satisfies the following condition: TL / (Fno*ImgH)≥2.400, where TL is the distance on the optical axis from the object side of the first lens to the image side of the fourth lens, Fno is the aperture value of the optical imaging lens, and ImgH is the maximum image height of the optical imaging lens.

5. The optical imaging lens as claimed in any one of claims 1 and 2, wherein the optical imaging lens further satisfies the following condition: ALT / (Fno*AAG)≥1.400, where ALT is the sum of the thicknesses of the four lenses from the first lens to the fourth lens on the optical axis, and Fno is the aperture value of the optical imaging lens.

6. The optical imaging lens as claimed in any one of claims 1 and 2, wherein the optical imaging lens further satisfies the following condition: TL / (Fno*AAG)≥2.200, where TL is the distance on the optical axis from the object side of the first lens to the image side of the fourth lens, and Fno is the aperture value of the optical imaging lens.

7. The optical imaging lens as claimed in any one of claims 1 and 2, wherein the optical imaging lens further satisfies the following condition: TTL / ImgH ≥ 4.900, where TTL is the distance from the object side of the first lens to an imaging surface on the optical axis, and ImgH is the maximum image height of the optical imaging lens.

8. An optical imaging lens as claimed in any one of claims 1 and 2, wherein the optical imaging lens further satisfies the following condition: (G12+G23+T3) / ImgH≥0.500, where G12 is the air gap between the first lens and the second lens on the optical axis, G23 is the air gap between the second lens and the third lens on the optical axis, T3 is the thickness of the third lens on the optical axis, and ImgH is the maximum image height of the optical imaging lens.

9. An optical imaging lens as claimed in any one of claims 1 and 3, wherein the optical imaging lens further satisfies the following condition: (T1+T2)(G12+G23+BFL)≥0.600, where T1 is the thickness of the first lens on the optical axis, T2 is the thickness of the second lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, G23 is the air gap between the second lens and the third lens on the optical axis, and BFL is the distance from the image side of the fourth lens to an imaging surface on the optical axis.

10. An optical imaging lens as claimed in any one of claims 1 and 3, wherein the optical imaging lens further satisfies the following condition: (BFL+T3) / (G12+G23)≥3.500, where BFL is the distance from the image-side surface of the fourth lens to an imaging surface on the optical axis, T3 is the thickness of the third lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, and G23 is the air gap between the second lens and the third lens on the optical axis.

11. The optical imaging lens of any one of claims 1 and 3, wherein the optical imaging lens further satisfies the following condition: TTL / (EPD+Tmax)≤1.400, where TTL is the distance from the object side of the first lens to an imaging surface on the optical axis, and Tmax is the maximum value of the four lens thicknesses of the first lens to the fourth lens on the optical axis.

12. The optical imaging lens of any one of claims 1 and 3, wherein the optical imaging lens further satisfies the following condition: TTL / EPD≤3.250, where TTL is the distance from the object side of the first lens to an imaging surface on the optical axis.

13. An optical imaging lens as claimed in any one of claims 1 to 3, wherein the optical imaging lens further satisfies the following condition: (T1+T2) / (Fno*(G12+G23))≥2.600, where T1 is the thickness of the first lens on the optical axis, T2 is the thickness of the second lens on the optical axis, Fno is the aperture value of the optical imaging lens, G12 is the air gap between the first lens and the second lens on the optical axis, and G23 is the air gap between the second lens and the third lens on the optical axis.

14. An optical imaging lens as claimed in any one of claims 1 to 3, wherein the optical imaging lens further satisfies the following condition: Fno*EFL / Tavg≤9.500, where Fno is the aperture value of the optical imaging lens, EFL is the effective focal length of the optical imaging lens, and Tavg is the average of the thicknesses of the four lenses from the first lens to the fourth lens on the optical axis.

15. An optical imaging lens as claimed in any one of claims 1 to 3, wherein the optical imaging lens further satisfies the following condition: Fno*(T1+T3+T4) / EPD≤1.550, where Fno is the aperture value of the optical imaging lens, T1 is the thickness of the first lens on the optical axis, T3 is the thickness of the third lens on the optical axis, and T4 is the thickness of the fourth lens on the optical axis.

16. An optical imaging lens as claimed in any one of claims 1 to 3, wherein the optical imaging lens further satisfies the following condition: (T1+T2) / (G12+G23)≥3.200, where T1 is the thickness of the first lens on the optical axis, T2 is the thickness of the second lens on the optical axis, G12 is the air gap between the first lens and the second lens on the optical axis, and G23 is the air gap between the second lens and the third lens on the optical axis.

17. The optical imaging lens of any one of claims 1 to 3, wherein the optical imaging lens further satisfies the following condition: EPD / Tavg ≥ 1.750, where Tavg is the average of the thicknesses of the four lenses of the first lens to the fourth lens on the optical axis.

18. The optical imaging lens of any one of claims 1 to 3, wherein the optical imaging lens further satisfies the following condition: Tmin / G34≤1.200, where Tmin is the minimum of the thicknesses of the first to fourth lenses on the optical axis, and G34 is the air gap between the third and fourth lenses on the optical axis.

19. The optical imaging lens of any one of claims 1 to 3, wherein the optical imaging lens further satisfies the following condition: ALT / EPD≤2.250, where ALT is the sum of the thicknesses of the four lenses of the first lens to the fourth lens on the optical axis.

20. An optical imaging lens as claimed in any one of claims 1 to 3, wherein the optical imaging lens further satisfies the following condition: TL / (G12+G23)≥6.100, where TL is the distance on the optical axis from the object side of the first lens to the image side of the fourth lens, G12 is the air gap between the first lens and the second lens on the optical axis, and G23 is the air gap between the second lens and the third lens on the optical axis.