Ultra-large-target-surface large-relative-aperture low-light-level night vision lens

Abstract

The utility model discloses a low-light night vision lens with a super-large target surface and a large relative aperture. The low-light-level night vision lens comprises seven lenses and four balsaming lens groups, a diaphragm is located on the front surface of the second balsaming lens group, and a third lens (3) is an aspherical lens. The diagonal line of the target surface of the low-light-level night vision lens reaches 26 mm, the F number is 1.4, the focal length is 15 mm, the wave band ranges from 450 nm to 1000 nm, and the low-light-level night vision lens can be used under visible light in the daytime and can also be used under low illumination at night. The low-light night vision lens can be adapted to a low-illumination CMOS (Complementary Metal-Oxide-Semiconductor Transistor) of 1920 * 1080 and 12 microns; the low-light-level night vision lens has a large relative aperture, can provide sufficient energy under low illumination, has a long focal length, and can be seen farther.

Description

Technical Field

[0001] The utility model discloses a low-light-level night vision lens with an ultra-large image plane and a large relative aperture, and this low-light-level night vision lens belongs to the field of low-light-level night vision. Background Art

[0002] Low light, also known as night sky light, is the general term for moonlight, starlight, and airglow existing at night. There are mainly two types of low-light-level night vision imaging, one is low-light CMOS, and the other is an image intensifier tube. The objective lenses required for imaging by both devices need to have a large relative aperture, and the F-number is generally less than 1.4. There are many domestic manufacturers engaged in low-light CMOS imaging, and there are various specifications for the core pixels. Among them, the 12-micron core produced by a certain company has a large image plane and good imaging effect.

[0003] The current problem is that: due to the large image plane of this core and low-light-level night vision imaging, the lens is required to have a large relative aperture and a large imaging target surface. There are many visible light lenses on the market, but the lenses that can simultaneously meet the requirements of a large relative aperture (F#≤1.4), a large target surface, a long working distance, and a large field of view are in a blank state. Summary of the Invention

[0004] The purpose of the utility model is to provide a low-light-level night vision lens with an ultra-large image plane and a large relative aperture, and this low-light-level night vision lens has the advantages of a large field of view, a large relative aperture, and low-light-level night vision.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] A low-light-level night vision lens with an ultra-large image plane and a large relative aperture, the low-light-level night vision lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a first cemented lens group, a second cemented lens group, a seventh lens, a third cemented lens group, and a fourth cemented lens group arranged in sequence from the object side to the image side along the optical axis; the first lens is a meniscus negative lens, the second lens is a biconvex positive lens, the third lens is a meniscus negative lens, the fourth lens is a meniscus negative lens, the fifth lens is a meniscus positive lens, the sixth lens is a biconcave negative lens, both the first cemented lens group and the second cemented lens group have positive optical powers, the seventh lens is a meniscus negative lens, and both the third cemented lens group and the fourth cemented lens group have positive optical powers.

[0007] Further, in the low-light-level night vision lens, the aperture stop is located on the front surface of the second cemented lens group.

[0008] Further, the third lens is an aspherical mirror.

[0009] Furthermore, the diagonal of the target surface of the low-light night vision lens reaches 26 mm, the F number is 1.4, the focal length is 15 mm, and the wavelength band ranges from 450 nm to 1000 nm.

[0010] The beneficial effects of the low-light night vision lens of the present utility model compared with the prior art are as follows:

[0011] 1) The low-light night vision lens of the present utility model has a large relative aperture, which can provide sufficient energy under low illumination;

[0012] 2) The low-light night vision lens of the present utility model has a long focal length. For the same target characteristics, it can see farther;

[0013] 3) The low-light night vision lens of the present utility model has a large field of view angle, which can view a larger range. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the super-large target surface and large relative aperture low-light night vision lens of the present utility model;

[0015] Figure 2 Short-focus two-dimensional diagram of the super-large target surface and large relative aperture low-light night vision lens of the present utility model;

[0016] Figure 3 MTF diagram of the super-large target surface and large relative aperture low-light night vision lens of the present utility model @ 40 lp / mm;

[0017] Figure 4 Spot diagram of the super-large target surface and large relative aperture low-light night vision lens of the present utility model;

[0018] Figure 5 Distortion diagram of the super-large target surface and large relative aperture low-light night vision lens of the present utility model;

[0019] Figure 6 Relative illumination diagram of the super-large target surface and large relative aperture low-light night vision lens of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following specific embodiments are used to further illustrate the present utility model:

[0021] This embodiment provides a super-large target surface and large relative aperture low-light night vision lens. This low-light night vision lens has the advantages of a large field of view, a large relative aperture, and low-light night vision, with good imaging quality and small distortion, and is suitable for the requirements of low-illumination camera modules.

[0022] See Figure 1, the low-light night vision lens of this embodiment includes 7 lenses and 4 cemented lens groups, specifically, the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the first cemented lens group 7, the second cemented lens group 8, the seventh lens 9, the third cemented lens group 10, and the fourth cemented lens group 11.

[0023] Among them, the first lens 1 is a meniscus negative lens, which has the function of expanding the field of view; the second lens 2 is a biconvex positive lens; the third lens 3 is a meniscus negative lens and is an aspherical lens; the fourth lens 4 is a meniscus negative lens; the fifth lens 5 is a meniscus positive lens; the sixth lens 6 is a biconcave negative lens; both the first cemented lens group 7 and the second cemented lens group 8 have positive optical powers; the seventh lens 9 is a meniscus negative lens; both the third cemented lens group 10 and the fourth cemented lens group 11 have positive optical powers.

[0024] The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the first cemented lens group 7, the second cemented lens group 8, the seventh lens 9, the third cemented lens group 10, and the fourth cemented lens group 11 are arranged in sequence from the object side to the image side along the optical axis of the entire low-light night vision lens.

[0025] Among them, the aperture stop is located on the front surface of the second cemented lens group 8, and the third lens 3 is an aspherical mirror. The diagonal of the target surface of this low-light night vision lens reaches 26 mm, the F number is 1.4, the focal length is 15 mm, and the wavelength band ranges from 450 nm to 1000 nm. This low-light night vision lens can be used both under daylight visible light and at low illuminance at night. This low-light night vision lens can be adapted to a 1920×1080@12μm low-illuminance CMOS.

[0026] The low-light night vision lens of this embodiment has a large relative aperture, can provide sufficient energy at low illuminance, and at the same time has a long focal length. For the same target characteristics, it can see farther.

[0027] See Figure 2 , Figure 2 shows the short-focus two-dimensional diagram of the low-light night vision lens of the present invention;

[0028] See Figure 3 , Figure 3 shows the @40 lp / mm MTF diagram of the low-light night vision lens of the present invention;

[0029] See Figure 4 , Figure 4 shows the spot diagram of the low-light night vision lens of the present invention;

[0030] See Figure 5 , Figure 5The distortion diagram of the low-light night vision lens of the present utility model is shown;

[0031] See Figure 6 , Figure 6 The relative illumination diagram of the low-light night vision lens of the present utility model is shown.

[0032] The above are only the preferred embodiments of the present utility model, and are not used to limit the protection scope of the present utility model. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A super large target surface and large relative aperture low light level night vision lens, characterized in that: The low-light-level night vision lens comprises a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), a first cemented lens group (7), a second cemented lens group (8), a seventh lens (9), a third cemented lens group (10) and a fourth cemented lens group (11) which are arranged in sequence from the object side to the image side along the optical axis; The first lens (1) is a meniscus negative lens, the second lens (2) is a biconvex positive lens, the third lens (3) is a meniscus negative lens, the fourth lens (4) is a meniscus negative lens, the fifth lens (5) is a meniscus positive lens, the sixth lens (6) is a biconcave negative lens, the first cemented lens group (7) and the second cemented lens group (8) both have positive optical power, the seventh lens (9) is a meniscus negative lens, and the third cemented lens group (10) and the fourth cemented lens group (11) both have positive optical power.

2. The ultra-large target surface and large relative aperture low-light-level night vision lens according to claim 1, characterized in that: In the low-light-level night vision lens, the diaphragm is located on the front surface of the second cemented lens group (8).

3. The ultra-large target surface and large relative aperture low-light-level night vision lens according to claim 2, characterized in that: The third lens (3) is an aspherical lens.

4. The ultra-large target surface and large relative aperture low-light-level night vision lens according to claim 3, characterized in that: The target surface diagonal of the low-light-level night vision lens reaches 26 mm, the F number is 1.4, the focal length is 15 mm, and the waveband is from 450 nm to 1000 nm.

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