A wide-angle lens

Abstract

The present invention discloses a wide-angle lens comprising a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, arranged sequentially along an optical axis from the object side to the image side. The first lens has a negative refractive power, the second lens has a positive refractive power, the third lens has a positive refractive power, the fourth lens has a negative refractive power, and the fifth lens has a positive refractive power. The first, second, fourth, and fifth lenses are all plastic aspheric lenses, and the third lens is a glass lens. The wide-angle lens of the present invention utilizes a 1G4P glass-plastic hybrid design, resulting in a compact overall structure, small size, and low cost. It also exhibits minimal temperature drift and exhibits good imaging performance within a temperature range of -40°C to 80°C.

Claims

1. A wide-angle lens, characterized in that: It includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence along an optical axis from the object side to the image side. Each of the first lens to the fifth lens includes an object side facing the object side through which imaging light passes and an image side facing the image side through which imaging light passes; The first lens has a negative diopter, and the object side of the first lens is concave, and the image side is concave; The second lens has a positive diopter, and the object side of the second lens is concave, and the image side is convex; The third lens has a positive diopter, and the object side of the third lens is convex, and the image side is convex; The fourth lens has a negative diopter, and the object side of the fourth lens is convex, and the image side is concave; The fifth lens has a positive diopter, and the object side of the fifth lens is convex, and the image side is convex; The aperture stop is located on the image side of the third lens. The first lens, the second lens, the fourth lens, and the fifth lens are all plastic aspherical lenses, and the third lens is a glass lens; This lens satisfies: -6mm < f1 < -5mm, 22mm < f2 < 26mm, 7mm < f3 < 9mm, -7mm < f4 < -5mm, 4mm < f5 < 6mm, where f1, f2, f3, f4, and f5 are the focal length values of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens respectively.

2. The wide-angle lens according to claim 1, wherein: This lens satisfies: 1 < |(f1 / f)| < 2, 5 < |(f2 / f)| < 7, 2 < |(f3 / f)| < 3, 0.5 < |(f4 / f)| < 1.5, 1 < |(f5 / f)| < 2, where f is the overall focal length value of the lens, and f1, f2, f3, f4, and f5 are the focal length values of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens respectively.

3. The wide-angle lens according to claim 1, wherein: This lens satisfies: 1.5 < nd1 < 1.6, 50 < vd1 < 60, 1.6 < nd2 < 1.7, 18 < vd2 < 26, 1.3 < nd3 < 1.7, 60 < vd3 < 100, 1.6 < nd4 < 1.7, 18 < vd4 < 26, 1.5 < nd5 < 1.7, 50 < vd5 < 60, where nd1, nd2, nd3, nd4, and nd5 are the refractive indices of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens respectively, and vd1, vd2, vd3, vd4, and vd5 are the dispersion coefficients of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens respectively.

4. The wide-angle lens according to claim 1, wherein: This lens satisfies: 1 < |(f12 / f345)| < 2, where f12 is the combined focal length value of the first lens and the second lens, and f345 is the combined focal length value of the third lens, the fourth lens, and the fifth lens.

5. The wide-angle lens according to claim 1, wherein: This lens satisfies: 0.5 < CT12 / CT345 < 1.2, where CT12 is the sum of the lens thicknesses of the first lens and the second lens on the optical axis, and CT345 is the sum of the lens thicknesses of the third lens, the fourth lens, and the fifth lens on the optical axis.

6. The wide-angle lens according to claim 1, wherein: The lens satisfies: 0.7 < IMH / EFL < 0.9, where IMH is the image-side semi-image height of the lens and EFL is the effective focal length of the lens.

7. A wide-angle lens according to claim 1 or 6, characterized in that: The effective focal length EFL of the lens satisfies: 3.8 mm < EFL < 4.0 mm.

8. The wide-angle lens according to claim 1, wherein: The lens satisfies: 5.0 ≤ TTL / AAG, where TTL is the overall optical length of the lens and AAG is the sum of the air gaps between adjacent two lenses of the first to fifth lenses on the optical axis.

9. The wide-angle lens according to claim 1 or 8, characterized in that: The overall optical length TTL of the lens satisfies: TTL < 23 mm.

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