Autofocus camera lens

Abstract

An automatic focusing shooting lens is disclosed and comprises a first lens group which is negative in focal power, a diaphragm, a second lens group which is positive in focal power, and a focusing lens which is negative in focal power that are all arranged in order from an object side to an image side. The automatic focusing shooting lens is characterized by small size, light weight, high image quality, wide focusing range and the like.

Description

technical field

[0001] The invention relates to a technology in the field of optical devices, in particular to an autofocus camera lens. Background technique

[0002] At present, drones and video conferencing generally use fixed-focus lenses for portability and installation, but the focus position of conventional fixed-focus lenses is often fixed, resulting in low pixels and inability to clearly image distant objects or nearby objects in the picture; The fixed aperture of the focal lens is prone to overexposure under changing ambient lighting conditions. Existing solutions include adding lenses, etc., but this will also increase the size and weight of the lens, and this type of lens is also difficult to deal with the defects of small field of view and distortion. Contents of the invention

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes an auto-focus camera lens, which has the characteristics of small size, light weight,...

Examples

Embodiment 1

[0025] Such as figure 1 As shown, this embodiment includes: a first lens group F1 with negative power, a stop STP, a second lens group F2 with positive power; and a focus lens F3 with negative power.

[0026] The first lens group F1 includes: first to third lenses L1, L2, L3, wherein: L3 is a glass aspherical lens.

[0027] The second lens group F2 includes: fourth to seventh lenses L4, L5, L6 and L7, wherein: L5 is a cemented lens, and L6 is a glass aspheric lens.

[0028] The focusing lens F3 is a plastic aspheric lens L8.

[0029]

[0030]

[0031] The ones marked with "*" in the table are aspherical lenses.

[0032] In this embodiment, the third lens L3, the sixth lens L6 and the eighth lens L8 are aspheric lenses, and the formulas of their aspheric lens coefficients are as follows:

[0033] Among them: Z is the sag value of the lens, c is the reciprocal of the radius of curvature, h is the height from the lens edge to the optical axis, k is the conic coefficien...

Embodiment 2

[0041] The lens parameters of this embodiment are shown in the table below:

[0042]

[0043]

[0044] The aspheric coefficients of the present embodiment are listed in the following table:

[0045] S5 S6 S13 S14 S17 S18 K 1.8027 6.1312 -0.1532 -0.1781 -6.5300 -3.7722 A 0.0007 0.0008 0.0004 0.0002 -0.0047 -0.0036 B -4.71E-06 0.0002 3.91E-05 5.01E-05 0.0001 9.70E-05 C 4.35E-06 -5.68E-05 1.35E-06 -3.22E-07 -3.98E-08 -1.20E-06 D -8.37E-07 7.78E-06 -4.02E-08 3.86E-08 -3.34E-08 3.47E-10 E 8.35E-08 -2.03E-07 -2.17E-09 -5.33E-10 -6.02E-11 1.26E-10

[0046] Parameter table under different object distances:

[0047] endless 1m 0.3m focal length F 8.35 8.3 8.25 Fno 2.61 2.6 2.59 D1 endless 1000 300 D2 0.57 0.71 1.06 D3 3.24 3.1 2.75 FOV 90.1 90.3 90.5

[0048] Such as Figure 4 Shown are the aberration diagrams of Example 2, including ax...

Embodiment 3

[0050] The difference between this embodiment and Embodiment 1 lies in that the angle of view of this embodiment is larger, the aperture is larger, and the third lens L3 and the sixth lens L6 use plastic aspheric lenses.

[0051] This embodiment includes: a first lens group F1 with negative power, a stop STP, a second lens group F2 with positive power; and a focus lens F3 with negative power.

[0052] The first lens group F1 includes: first to third lenses L1, L2, L3, wherein: L3 is a plastic aspheric lens.

[0053] The second lens group F2 includes: fourth to seventh lenses L4, L5, L6 and L7, wherein: L5 is a cemented lens, and L6 is a plastic aspheric lens.

[0054] The focusing lens F3 is a plastic aspheric lens L8.

[0055] R D Nd Vd OBJ D1 1 11.09 0.78 1.49 70.5 2 5.41 1.91 3 9.7 0.92 1.549 61.2 4 4.65 0.94 5 7.3 1.04 1.64 23 6 5.9 3.15 STP 0.28 8 30.3 2.21 1.549 68.2 ...

technical field

[0001] The invention relates to a technology in the field of optical devices, in particular to an autofocus camera lens. Background technique

[0002] At present, drones and video conferencing generally use fixed-focus lenses for portability and installation, but the focus position of conventional fixed-focus lenses is often fixed, resulting in low pixels and inability to clearly image distant objects or nearby objects in the picture; The fixed aperture of the focal lens is prone to overexposure under changing ambient lighting conditions. Existing solutions include adding lenses, etc., but this will also increase the size and weight of the lens, and this type of lens is also difficult to deal with the defects of small field of view and distortion. Contents of the invention

[0003] Aiming at the above-mentioned deficiencies in the prior art, the present invention proposes an auto-focus camera lens, which has the characteristics of small size, light weight,...

Examples

Embodiment 1

[0025] Such as figure 1 As shown, this embodiment includes: a first lens group F1 with negative power, a stop STP, a second lens group F2 with positive power; and a focus lens F3 with negative power.

[0026] The first lens group F1 includes: first to third lenses L1, L2, L3, wherein: L3 is a glass aspherical lens.

[0027] The second lens group F2 includes: fourth to seventh lenses L4, L5, L6 and L7, wherein: L5 is a cemented lens, and L6 is a glass aspheric lens.

[0028] The focusing lens F3 is a plastic aspheric lens L8.

[0029]

[0030]

[0031] The ones marked with "*" in the table are aspherical lenses.

[0032] In this embodiment, the third lens L3, the sixth lens L6 and the eighth lens L8 are aspheric lenses, and the formulas of their aspheric lens coefficients are as follows:

[0033] Among them: Z is the sag value of the lens, c is the reciprocal of the radius of curvature, h is the height from the lens edge to the optical axis, k is the conic coefficien...

Embodiment 2

[0041] The lens parameters of this embodiment are shown in the table below:

[0042]

[0043]

[0044] The aspheric coefficients of the present embodiment are listed in the following table:

[0045] S5 S6 S13 S14 S17 S18 K 1.8027 6.1312 -0.1532 -0.1781 -6.5300 -3.7722 A 0.0007 0.0008 0.0004 0.0002 -0.0047 -0.0036 B -4.71E-06 0.0002 3.91E-05 5.01E-05 0.0001 9.70E-05 C 4.35E-06 -5.68E-05 1.35E-06 -3.22E-07 -3.98E-08 -1.20E-06 D -8.37E-07 7.78E-06 -4.02E-08 3.86E-08 -3.34E-08 3.47E-10 E 8.35E-08 -2.03E-07 -2.17E-09 -5.33E-10 -6.02E-11 1.26E-10

[0046] Parameter table under different object distances:

[0047] endless 1m 0.3m focal length F 8.35 8.3 8.25 Fno 2.61 2.6 2.59 D1 endless 1000 300 D2 0.57 0.71 1.06 D3 3.24 3.1 2.75 FOV 90.1 90.3 90.5

[0048] Such as Figure 4 Shown are the aberration diagrams of Example 2, including ax...

Embodiment 3

[0050] The difference between this embodiment and Embodiment 1 lies in that the angle of view of this embodiment is larger, the aperture is larger, and the third lens L3 and the sixth lens L6 use plastic aspheric lenses.

[0051] This embodiment includes: a first lens group F1 with negative power, a stop STP, a second lens group F2 with positive power; and a focus lens F3 with negative power.

[0052] The first lens group F1 includes: first to third lenses L1, L2, L3, wherein: L3 is a plastic aspheric lens.

[0053] The second lens group F2 includes: fourth to seventh lenses L4, L5, L6 and L7, wherein: L5 is a cemented lens, and L6 is a plastic aspheric lens.

[0054] The focusing lens F3 is a plastic aspheric lens L8.

[0055] R D Nd Vd OBJ D1 1 11.09 0.78 1.49 70.5 2 5.41 1.91 3 9.7 0.92 1.549 61.2 4 4.65 0.94 5 7.3 1.04 1.64 23 6 5.9 3.15 STP 0.28 8 30.3 2.21 1.549 68.2 ...

Images