Ten-million-level pixel day and night confocal imaging lens and electronic device

Abstract

The invention relates to the technical field of imaging lenses, and discloses a ten-million-level pixel day and night confocal imaging lens and an electronic device.The imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged from the object space to the image space; the aperture diaphragm is arranged between the second lens and the third lens; the imaging surface is positioned on one side of the image space of the ninth lens; the focal length relational expression of the first lens to the ninth lens is as follows:-0.7 lt; f1 / Flt; -0.2%; 0.2 lt; f2 / Flt; 0.8; 0.2 lt; f3 / Flt; 0.8; -0.8 1t,-0.8 1t; f4 / Flt; -0.4, and-0.4; 0.2 lt; f5 / Flt; 0.8; -0.9 1t;-0.9 1t; f6 / Flt; -0.5,-0.5; -0.8 1t,-0.8 1t; f7 / Flt; -0.2%; 0.2 lt; f8 / Flt; 0.8; 1lt; f9 / Flt; 2. According to the imaging lens and the electronic device, the lens can achieve high resolution of ten millions of pixels, can be matched with a chip with a 1.4-micron pixel, is suitable for a 1 / 1.8-inch large-target-surface chip, improves the sensitivity and definition of an image, has higher spectral transmission capacity and spectral correction capacity especially under the condition of low illumination, and is suitable for large-target-surface chips with high resolution of 10 millions of pixels. The method is suitable for occasions requiring high-resolution and high-sensitivity monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and in particular to a 10 million-pixel day and night confocal imaging lens and an electronic device. Background Art

[0002] The statements in this section merely provide background art related to the present disclosure and do not necessarily constitute prior art.

[0003] The 10 million-pixel day and night confocal imaging lens is a lens that can maintain clear imaging under different lighting conditions. It is usually used in monitoring, industrial inspection and other fields. Its main functions and features are: support for high-definition imaging of 10 million pixels. Day and night dual-use, providing color images during the day and black and white images at night. Built-in autofocus function, easy to operate. Fog-penetrating function, able to achieve clear imaging in foggy environments. Automatic temperature compensation function, adapt to environments with large temperature differences. Military-grade standards, can work in extreme environments of -40℃ to 70℃. These 10 million-pixel day and night confocal imaging lenses can provide high-quality imaging effects under various lighting conditions through optical design and functional integration, and are suitable for occasions that require all-weather monitoring.

[0004] In specific usage environments, tens of millions of pixels day and night confocal imaging lenses are widely used in monitoring practical scenarios such as video surveillance, perimeter security, personnel positioning, industrial monitoring, traffic monitoring, commercial monitoring, and environmental monitoring, especially in scenarios such as elderly care, child care, infant care, and medical care.

[0005] In the above-mentioned monitoring scenarios, the current 10 million-pixel day and night confocal imaging lenses have problems such as small target area, large chromatic aberration, low illumination, low resolution, and high cost. The resolution of lenses suitable for 1 / 1.8-inch chips is mostly 2.74um, which has gradually become unable to meet the needs of the monitoring market. Summary of the invention

[0006] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a cutoff frequency of 300 line pairs / mm at the full field of view, and a corresponding modulation transfer function value is better than 0.3. The lens can achieve a high resolution of tens of millions pixels and can be adapted to chips with 1.4um pixels, which helps to improve the sensitivity and clarity of the image, especially under low light conditions. It is suitable for 1 / 1.8-inch large target chip, has stronger spectral transmission and spectral correction capabilities, and is suitable for tens of millions of pixels day and night confocal imaging lens and electronic equipment in occasions requiring high resolution and high sensitivity monitoring.

[0007] The technical solution adopted by the present invention is: a tens of millions of pixel day and night co - focal imaging lens, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence from the object side to the image side, and an aperture stop disposed between the third lens and the fourth lens; and an imaging surface on the image side of the ninth lens; wherein: the focal lengths of the first lens to the ninth lens satisfy the following focal length relational expressions: -0.7 < F1 / F < -0.2; 0.2 < F2 / F < 0.8; 0.2 < F3 / F < 0.8; -0.8 < F4 / F < -0.4; 0.2 < F5 / F < 0.8; -0.9 < F6 / F < -0.5; -0.8 < F7 / F < -0.2; 0.2 < F8 / F < 0.8; 1 < F9 / F < 2; where F is the total focal length F, 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.

[0008] In at least one embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are all spherical mirrors.

[0009] In at least one embodiment, the first lens and the second lens, the fifth lens and the sixth lens, and the seventh lens and the eighth lens are respectively one - piece cemented lenses, and at the same time, an air gap is provided between the second lens and the third lens, between the third lens and the aperture stop, between the aperture stop and the fourth lens, between the fourth lens and the fifth lens, between the sixth lens and the seventh lens, between the seventh lens and the eighth lens, and between the ninth lens and the imaging surface.

[0010] In at least one embodiment, the relationship between the optical total length TTL of the imaging lens and the maximum image height IH corresponding to the maximum field of view angle is: 5 ≤ TTL / IH ≤ 7.

[0011] In at least one embodiment, the relationship between the back focal length BFL of the imaging lens and the total focal length F is: 0.5 ≤ BFL / F ≤ 1.

[0012] In at least one embodiment, the first lens is a negative - powered biconcave lens, the second lens is a positive - powered biconvex lens, the third lens is a positive - powered biconvex lens, the fourth lens is a negative - powered biconcave lens, the fifth lens is a positive - powered biconvex lens, the sixth lens is a negative - powered biconcave lens, the seventh lens is a negative - powered biconcave lens, the eighth lens is a positive - powered biconvex lens, and the ninth lens is a positive - powered biconvex lens.

[0013] An electronic device having the above-mentioned 10 million-pixel day and night confocal imaging lens.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The first lens, the second lens, the third lens, the aperture stop, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are arranged in sequence along the optical axis, and the effective focal length F of the optical system composed of these lenses satisfies the focal length relationship of the formula, which can be adapted to the chip with 1.4um pixel, which helps to improve the sensitivity and clarity of the image, especially in low light conditions. It is suitable for 1 / 1.8-inch large target chip, thereby improving the resolution of the 10 million-pixel day and night confocal imaging lens and electronic devices, and can provide very clear images, capture more details, and have a lower cost.

[0016] 2. The first lens is designed as a biconcave lens with negative optical power, the second lens is designed as a biconvex lens with positive optical power, the third lens is designed as a biconvex lens with positive optical power, the fourth lens is designed as a biconcave lens with negative optical power, the fifth lens is designed as a biconvex lens with positive optical power, the sixth lens is designed as a biconcave lens with negative optical power, the seventh lens is designed as a biconcave lens with negative optical power, the eighth lens is designed as a biconvex lens with positive optical power, and the ninth lens is designed as a biconvex lens with positive optical power. The first lens to the ninth lens are all spherical lenses, which are easy to process and detect.

[0017] The 10 million-pixel day and night confocal imaging lens and electronic device of the present invention have a cutoff frequency of 300 line pairs / mm at the full field of view, and the corresponding modulation transfer function value is better than 0.3. The imaging lens can achieve a high resolution of 10 million pixels and can be adapted to chips with 1.4um pixels, which helps to improve the sensitivity and clarity of the image, especially under low light conditions. It is suitable for 1 / 1.8-inch large target chip, has stronger spectral transmission and spectral correction capabilities, is suitable for occasions requiring high-resolution and high-sensitivity monitoring, and has good practical and economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the optical structure of a high-resolution 10 million-pixel day-night confocal imaging lens according to an embodiment of the present invention;

[0019] Figure 2 yes Figure 1 A modulation transfer function curve diagram of an embodiment of the invention, wherein the abscissa is the spatial frequency in cycles / mm, and the ordinate is the OTF modulus value;

[0020] Figure 3 yes Figure 1A distortion curve diagram of an embodiment of the present invention, wherein the horizontal axis is percentage and the vertical axis is field of view angle;

[0021] Figure 4 yes Figure 1 A relative illumination curve diagram of an embodiment of the present invention, wherein the abscissa is the field of view in millimeters and the ordinate is the relative illumination;

[0022] Among them: 1-first lens, 2-second lens, 3-third lens, 4-fourth lens, 5-fifth lens, 6-sixth lens, 7-seventh lens, 8-eighth lens, 9-ninth lens, 10-aperture stop, 11-imaging surface. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the combination or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, in the description of the embodiments of the present invention, the device positional relationships such as "up", "down", "front", "back", "left", "right" and the like in all the drawings are based on the positions or positional relationships shown in the accompanying drawings. Figure 1 As standard.

[0025] like Figure 1 As shown, a 10 million-pixel day and night confocal imaging 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 seventh lens 7, an eighth lens 8 and a ninth lens 9 arranged in sequence from the object side to the image side, and an aperture stop 10 arranged between the second lens 2 and the third lens 3; and an imaging surface 11 located on the image side of the ninth lens 9; wherein: the focal lengths of the first lens 1 to the ninth lens 9 satisfy the following focal length relationship:

[0026] -0.7 <F1 / F<-0.2;

[0027] 0.2 <F2 / F<0.8;

[0028] 0.2 <F3 / F<0.8;

[0029] -0.8 <F4 / F<-0.4;

[0030] 0.2 <F5 / F<0.8;

[0031] -0.9 <F6 / F<-0.5;

[0032] -0.8 <F7 / F<-0.2;

[0033] 0.2 <F8 / F<0.8;

[0034] 1 <F9 / F<2;

[0035] Wherein, F is the total focal length F, 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.

[0036] In at least one embodiment, 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 seventh lens 7, the eighth lens 8 and the ninth lens 9 are all spherical lenses, which are convenient for processing and testing.

[0037] In at least one embodiment, the first lens 1 and the second lens 2, the fifth lens 5 and the sixth lens 6, and the seventh lens 7 and the eighth lens 8 are respectively one-piece glued lenses, and air gaps are provided between the second lens 2 and the third lens 3, between the third lens 3 and the aperture stop 10, between the aperture stop 10 and the fourth lens 4, between the fourth lens 4 and the fifth lens 5, between the sixth lens 6 and the seventh lens 7, between the seventh lens 7 and the eighth lens 8, and between the ninth lens 9 and the imaging plane 11, that is, the first lens 1 and the second lens 2 are independent one-piece glued lenses, the fifth lens 5 and the sixth lens 6 are independent one-piece glued lenses, and the seventh lens 7 and the eighth lens 8 are independent one-piece glued lenses. Each group of one-piece glued lenses can be independently installed and disassembled during the installation process, but the glued glued lenses are installed and disassembled as a whole. Except for the glued groups of lenses, other lenses are arranged with air gaps.

[0038] In at least one embodiment, the relationship between the total optical length TTL of the imaging lens and the maximum image height IH corresponding to the maximum field of view angle is: 5≤TTL / IH≤7.

[0039] In at least one embodiment, the relationship between the back focal length BFL and the total focal length F of the imaging lens is: 0.5≤BFL / F≤1.

[0040] In at least one embodiment, the first lens 1 is a biconcave lens with negative optical power, the second lens 2 is a biconvex lens with positive optical power, the third lens 3 is a biconvex lens with positive optical power, the fourth lens 4 is a biconcave lens with negative optical power, the fifth lens 5 is a biconvex lens with positive optical power, the sixth lens 6 is a biconcave lens with negative optical power, the seventh lens 7 is a biconcave lens with negative optical power, the eighth lens 8 is a biconvex lens with positive optical power, and the ninth lens 9 is a biconvex lens with positive optical power.

[0041] In at least one embodiment, the air spacing between the second lens 2 and the third lens 3 is between 0.1 mm and 0.5 mm, the air spacing between the third lens 3 and the aperture stop 10 is between 0.1 mm and 0.5 mm, the air spacing between the aperture stop 10 and the fourth lens 4 is between 0.4 mm and 1 mm, the air spacing between the fourth lens 4 and the fifth lens 5 is between 0.4 mm and 1 mm, the air spacing between the sixth lens 6 and the seventh lens 7 is between 0.1 mm and 0.5 mm, the air spacing between the eighth lens 8 and the ninth lens 9 is between 0.1 mm and 0.5 mm, and the air spacing between the ninth lens 9 and the imaging plane 11 is between 6 mm and 12 mm.

[0042] In one embodiment, the air gap between the second lens 2 and the third lens 3 is 0.1 mm, the air gap between the third lens 3 and the aperture stop 10 is 0.4 mm, the air gap between the aperture stop 10 and the fourth lens 4 is 0.6 mm, the air gap between the fourth lens 4 and the fifth lens 5 is 0.6 mm, the air gap between the sixth lens 6 and the seventh lens 7 is 0.1 mm, the air gap between the eighth lens 8 and the ninth lens 9 is 0.1 mm, and the air gap between the ninth lens 9 and the imaging plane 11 is 9.3 mm. In this embodiment, the effective focal length F of the high-resolution 10 million pixel day and night confocal imaging lens is 12.5 mm, the relative numerical aperture is F / 2.4, the full field angle is 39.2°, the diagonal size of the imaging plane is 9 mm, and the total optical length is 28 mm from the first lens 1 to the ninth lens 9. The working band is 400-900 nm, wherein the optical parameters of each lens are shown in Table 1 below for the optical parameters of the lens in this embodiment.

[0043] Table 1 Optical parameters of lenses in the embodiment

[0044] Face number radius thickness Refractive Index Abbe number 1 -12.1 3 1.92 20.9 2 9.1 3.0 1.75 51 3 -12.6 0.1 / / 4 10.6 1.8 2.10 17.0 5 -47.1 0.4 / / 6(Aperture) unlimited 0.6 / / 7 -27.0 0.8 1.61 44.1 8 6.2 0.6 / / 9 6.9 1.7 1.88 40.8 10 -737.2 1.0 1.85 23.8 11 9.4 1.0 / / 12 -12.4 0.8 1.99 16.5 13 8.7 2.5 1.59 68.3 14 -8.5 0.1 / / 15 29.6 1.4 2.10 17.0 16 -43.1 7.6 / / 17 unlimited 9.3 / / Image plane unlimited / / /

[0045] like Figure 2 As shown, Figure 1The high-resolution 10 million pixel day and night confocal imaging lens shown has a cutoff frequency of 300 line pairs / mm at the full field of view, and the corresponding modulation transfer function value is better than 0.3. The imaging lens can reach 10 million pixels and can be adapted to chips with 1.4um pixels. It is suitable for 1 / 1.8-inch large target chip, and the modulation transfer function curves of each field of view are relatively concentrated, indicating that the high-resolution 10 million pixel day and night confocal imaging lens can achieve high-precision detection of targets.

[0046] like Figure 3 As shown, Figure 1 The high-resolution 10 million pixel day and night confocal imaging lens shown has a distortion value of less than 2% over the entire field of view, achieving high fidelity from visible to infrared imaging.

[0047] like Figure 4 As shown, Figure 1 The high-resolution 10 million pixel day and night confocal imaging lens shown has a relative illumination value greater than 80% in the entire field of view, avoiding the occurrence of dark corners.

[0048] Electronic devices with the above-mentioned 10 million-pixel day and night confocal imaging lens include but are not limited to medical diagnosis, microscope systems, bill imaging acquisition, industrial assembly line imaging acquisition, fingerprint, palm print imaging acquisition, desktop image, portrait, iris acquisition, high-speed license plate capture, outdoor monitoring, etc. in the fields of medical, banking, industry, security, transportation, and monitoring. The 10 million-pixel day and night confocal imaging lens has high resolution, providing clear and delicate images; thus providing high-speed frame rate to ensure the smoothness of dynamic images, with high color reproduction, providing realistic image colors; achieving no compression and no interpolation to ensure the authenticity of the image; multiple trigger and I / O options to meet different shooting needs.

[0049] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. Ten million pixel day and night confocal imaging lens, characterized by: include: 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 seventh lens (7), an eighth lens (8) and a ninth lens (9) arranged in order from the object side to the image side, and an aperture stop (10) disposed between the third lens (3) and the fourth lens (4); and An imaging surface (11) located on the image side of the ninth lens (9); Wherein: the focal lengths of the first lens (1) to the ninth lens (9) satisfy the following focal length relationship: -0.7 <F1 / F<-0.2; 0.2 <F2 / F<0.8; 0.2 <F3 / F<0.8; -0.8 <F4 / F<-0.4; 0.2 <F5 / F<0.8; -0.9 <F6 / F<-0.5; -0.8 <F7 / F<-0.2; 0.2 <F8 / F<0.8; 1 <F9 / F<2; Wherein, F is the total focal length F, 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.

2. The 10 million pixel day and night confocal imaging lens according to claim 1, characterized in that: 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 seventh lens (7), the eighth lens (8) and the ninth lens (9) are all spherical lenses.

3. The 10 million pixel day and night confocal imaging lens according to claim 2, characterized in that: The first lens (1) and the second lens (2), the fifth lens (5) and the sixth lens (6), and the seventh lens (7) and the eighth lens (8) are respectively one-piece cemented lenses, and air spaces are provided between the second lens (2) and the third lens (3), between the third lens (3) and the aperture stop (10), between the aperture stop (10) and the fourth lens (4), between the fourth lens (4) and the fifth lens (5), between the sixth lens (6) and the seventh lens (7), between the seventh lens (7) and the eighth lens (8), and between the ninth lens (9) and the imaging surface (11).

4. The 10 million pixel day and night confocal imaging lens according to claim 3, characterized in that: The relationship between the total optical length TTL of the imaging lens and the maximum image height IH corresponding to the maximum field of view is: 5≤ TTL / IH≤7.

5. The 10 million pixel day and night confocal imaging lens according to claim 4, characterized in that: The relationship between the back focal length BFL and the total focal length F of the imaging lens is: 0.5≤BFL / F≤1.

6. The 10 million pixel day and night confocal imaging lens according to any one of claims 1 to 5, characterized in that: The first lens (1) is a biconcave lens with negative optical power, the second lens (2) is a biconvex lens with positive optical power, the third lens (3) is a biconvex lens with positive optical power, the fourth lens (4) is a biconcave lens with negative optical power, the fifth lens (5) is a biconvex lens with positive optical power, the sixth lens (6) is a biconcave lens with negative optical power, the seventh lens (7) is a biconcave lens with negative optical power, the eighth lens (8) is a biconvex lens with positive optical power, and the ninth lens (9) is a biconvex lens with positive optical power.

7. The 10 million pixel day and night confocal imaging lens according to claim 6, characterized in that: The air interval between the second lens (2) and the third lens (3) is between 0.1 mm and 0.5 mm, the air interval between the third lens (3) and the aperture stop (10) is between 0.1 mm and 0.5 mm, the air interval between the aperture stop (10) and the fourth lens (4) is between 0.4 mm and 1 mm, the air interval between the fourth lens (4) and the fifth lens (5) is between 0.4 mm and 1 mm, the air interval between the sixth lens (6) and the seventh lens (7) is between 0.1 mm and 0.5 mm, the air interval between the eighth lens (8) and the ninth lens (9) is between 0.1 mm and 0.5 mm, and the air interval between the ninth lens (9) and the imaging plane (11) is between 6 mm and 12 mm.

8. An electronic device, characterized in that: A day and night confocal imaging lens with tens of millions pixels as claimed in any one of claims 1 to 7.

Images