Large aperture infrared confocal optical system and its application camera module

Abstract

The application provides a large-aperture infrared confocal optical system and an application camera module thereof, which mainly comprises nine lenses, the first lens has a convex object surface, a concave image surface and a negative optical power, the second lens has a concave object surface, a convex image surface and a negative optical power, the third lens has a convex object surface, a concave image surface and a positive optical power, the fourth lens has a convex object surface and a convex image surface and a positive optical power, the fifth lens has a convex object surface, a concave image surface and a negative optical power, the sixth lens has a convex object surface and a convex image surface and a positive optical power, the seventh lens has a convex object surface and a convex image surface and a positive optical power, the eighth lens has a concave object surface, a convex image surface and a negative optical power, and the ninth lens has a convex object surface, a concave image surface and an optical power, the number of lenses is reasonable, the structure is simple, the optical power of the lenses is reasonably distributed, the lens aberration is optimized, the imaging quality of the optical system is improved, the characteristics of super wide angle, high illumination, day and night confocal and excellent temperature characteristics are considered, and the optical system has great potential in the IPC market.

Claims

1. A large-aperture infrared confocal optical system, characterized in that: Along the optical axis from the object plane to the image plane, the lenses are sequentially arranged as follows: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens. The object side of the first lens is convex, and the image side is concave; its optical power is negative. The object side of the second lens is concave, and the image side is convex, and its optical power is negative. The object side of the third lens is convex, and the image side is concave; its optical power is positive. The fourth lens has convex surfaces on both the object plane and image plane sides, and its optical power is positive. The fifth lens has a convex surface on the object side and a concave surface on the image side, and its optical power is negative. The sixth lens has convex surfaces on both the object plane and image plane sides, and its optical power is positive. The seventh lens has convex surfaces on both the object plane and image plane sides, and its optical power is positive. The object side of the eighth lens is concave, and the image side is convex; its optical power is negative. The object side of the ninth lens is convex, and the image side is concave, and it has optical power.

2. The large-aperture infrared confocal optical system according to claim 1, characterized in that: Each lens in this optical system satisfies the following condition: -1.89 mm < f1 / f < -0.75 mm; and / or -20mm < f2 / f < -5mm; and / or 4.3mm < f3 / f < 15 mm; and / or 2.7 mm < f4 / f < 8.8 mm; and / or -7.2mm < f5 / f < -1.2mm; and / or 0.1 mm < f6 / f < 4.2 mm; and / or 1.5mm < f7 / f < 4.5mm; and / or -15.5mm < f8 / f < -9.3mm; and / or -50mm < f9 / f < 115mm; Where f is the focal length of the entire optical system; f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, f8 is the focal length of the eighth lens, and f9 is the focal length of the ninth lens.

3. The large-aperture infrared confocal optical system according to claim 1, characterized in that: Each lens in this optical system satisfies the following condition: 1.65 < Nd1 < 1.92, 35 < Vd1 < 60; and / or 1.53 < Nd2 < 1.67, 20 < Vd2 < 58; and / or 1.53 < Nd3 < 1.67, 20 < Vd3 < 58; and / or 1.43 < Nd4 < 1.62, 60 < Vd4 < 95; and / or 1.65 < Nd5 < 1.95, 17 < Vd5 < 33; and / or 1.43 < Nd6 < 1.62, 60 < Vd6 < 95; and / or 1.43 < Nd7 < 1.62, 60 < Vd7 < 95; and / or 1.53 < Nd8 < 1.67, 20 < Vd8 < 58; and / or 1.53<Nd9<1.67, 20<Vd9<58; Wherein, Nd1 is the refractive index of the first lens, and Vd1 is the Abbe number of the first lens; Nd2 is the refractive index of the second lens, and Vd2 is the Abbe number of the second lens; Nd3 is the refractive index of the third lens, and Vd3 is the Abbe number of the third lens; Nd4 is the refractive index of the fourth lens, and Vd4 is the Abbe number of the fourth lens; Nd5 is the refractive index of the fifth lens, and Vd5 is the Abbe number of the fifth lens; Nd6 is the refractive index of the sixth lens, and Vd6 is the Abbe number of the sixth lens; Nd7 is the refractive index of the seventh lens, and Vd7 is the Abbe number of the seventh lens; Nd8 is the refractive index of the eighth lens, and Vd8 is the Abbe number of the eighth lens; Nd9 is the refractive index of the ninth lens, and Vd9 is the Abbe number of the ninth lens.

4. The large-aperture infrared confocal optical system according to any one of claims 1-3, characterized in that: Lenses 1, 4, 5, 6, and 7 are spherical glass lenses; lenses 2, 3, 8, and 9 are aspherical plastic lenses; and / or The aperture stop is positioned between the second lens and the third lens.

5. The large-aperture infrared confocal optical system according to any one of claims 1-3, characterized in that: The system satisfies the following condition: 0.45mm < f / TTL*ImgH < 1.01mm; Where f is the effective focal length of the optical system, TTL is the on-axis distance from the object side of the first lens to the imaging plane, and ImgH is half the diagonal length of the effective pixel area on the imaging plane.

6. The large-aperture infrared confocal optical system according to any one of claims 1-3, characterized in that: The fifth and sixth lenses are bonded together to form a combined lens.

7. The large-aperture infrared confocal optical system according to any one of claims 1-3, characterized in that: The learning system satisfies: 2.0 ≤ FOV / TTL ≤ 6; Where TTL is the on-axis distance from the object side of the first lens to the imaging plane; FOV is the field of view angle in the diagonal direction.

8. The large-aperture infrared confocal optical system according to any one of claims 1-3, characterized in that: The learning system satisfies: TTL / f ≤ 10; Where f is the effective focal length of the optical imaging system, and TTL is the on-axis distance from the object side of the first lens to the imaging plane.

9. The large-aperture infrared confocal optical system according to any one of claims 1-3, characterized in that: The optical system satisfies the following requirements: FOV ≥ 135° and MIC ≥ 9.2mm.

10. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with the optical system according to any one of claims 1-9.

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