High-resolution optical lens with ultra-large field angle and manufacturing method and application thereof

Abstract

The invention provides an ultra-large field angle high-resolution optical lens. The ultra-large field angle high-resolution optical lens comprises ten lens groups and fifteen lenses which are sequentially arranged from an object plane to an image plane, the first lens group is a first lens with negative focal power; the second lens group is a second lens with negative focal power; the third lens group is a third glued lens with positive focal power; the fourth lens group is a fourth glued lens with positive focal power; the fifth lens group is a fifth glued lens with negative focal power; the sixth lens group is a sixth lens with positive focal power; the seventh lens group is a seventh lens with positive focal power; the eighth lens group is an eighth glued lens with negative focal power; the ninth lens group is a ninth glued lens with positive focal power; and the tenth lens group is a tenth lens with positive focal power. According to the invention, the field angle and the resolution of the lens are improved, so that the cost of a special projection engineering project is reduced.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular to an ultra-large field of view and high-resolution optical lens, and also to a manufacturing method and use of the ultra-large field of view and high-resolution optical lens. Background Art

[0002] With the development of optical imaging technology, various exhibition projects, dome theater projects, monitoring, drone aerial photography or identification camera projects have higher and higher requirements for lenses; especially optical lenses with ultra-large field of view and high resolution, which have been in increasing demand in recent years; currently, the projection of dome screens, circular screens and special-shaped screens on the market is mostly achieved by the fusion technology of multiple projectors, which has high costs in terms of personnel, equipment and materials. Therefore, the cost of such projects remains high. Summary of the invention

[0003] In view of this, the present invention aims to provide an ultra-large field of view and high-resolution optical lens to improve the field of view and resolution of the lens and reduce the cost of special projection engineering projects.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] An ultra-large field-of-view high-resolution optical lens, comprising:

[0006] Fifteen lenses in ten groups arranged from the object plane to the image plane;

[0007] The first lens group is a first lens with negative optical power; the second lens group is a second lens with negative optical power; the third lens group is a third cemented lens with positive optical power; the fourth lens group is a fourth cemented lens with positive optical power; the fifth lens group is a fifth cemented lens with negative optical power; the sixth lens group is a sixth lens with positive optical power; the seventh lens group is a seventh lens with positive optical power; the eighth lens group is an eighth cemented lens with negative optical power; the ninth lens group is a ninth cemented lens with positive optical power; and the tenth lens group is a tenth lens with positive optical power.

[0008] Furthermore, a light barrier is provided between the fifth lens group and the sixth lens group.

[0009] Furthermore, the focal length of the optical lens is f=1 mm, the relative aperture (D / f) is 1 / 2.3, the full field angle 2w is 210°, the back working distance is greater than 10.5 mm, and the inverse distance ratio is greater than 10.

[0010] Furthermore, the optical lens adopts a refractive light path.

[0011] A manufacturing method of the above-mentioned ultra-large field angle high-resolution optical lens, firstly setting the basic optical parameters of the whole system: field angle, relative aperture and working wavelength, and inserting an equivalent parallel plate after the rear group to simulate the internal synthetic prism of the imaging device; then adjusting the focal length of the system to the target value, and on this basis, using a design optimization method combining manual and design software to transform and optimize the system; during the transformation and optimization, ensuring that the light barrier is located between the front group and the rear group, and closer to the rear group;

[0012] In the later stage of design optimization, the precise calculation of the manually subdivided aperture and field of view is combined to locate the boundary light and characteristic light positions, find the relationship between various aberrations in the lens, reasonably match the aberrations, and then continuously optimize. During the optimization process, pay attention to updating and adjusting various optimization target values ​​at any time.

[0013] A use of the above-mentioned ultra-large field of view high-resolution optical lens, after adjusting the air gap between the front and rear groups of the optical lens and the lens curvature radius, it is used to realize the use of digital projectors with different light sources based on DLP, LCD chips with a size of 0.33-1.38 inches and CCD or CMOS photography and surveillance cameras with a chip size of 1 / 3 to 4 / 3 inches, and the full field of view can be adjusted between 185-230 degrees.

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

[0015] The ultra-large field of view and high-resolution optical lens of the present invention is provided with ten lens groups and fifteen lenses. When projection on a spherical screen, a circular screen or a special-shaped screen is required, it is not necessary to use a multi-camera fusion technology. By providing ten lens groups and fifteen lenses, the field of view and resolution of the lens are improved, and the cost required for the projection system is reduced. At the same time, the optical lens of the present application has a simple structure and low processing difficulty, which significantly reduces the processing cost, and the tolerance performance of the optical lens is strong.

[0016] Secondly, the lens has a large field of view (full field of view is 185-230 degrees), high resolution, high contrast and good chromatic aberration correction.

[0017] In addition, the optical lens has good applicability, that is, it is suitable for different application scenarios. After adjusting the air gap between the front and rear groups of the optical lens and the lens curvature radius, it can be used in digital projectors with different light sources based on DLP and LCD chips with a size of 0.33-1.38 inches and CCD or CMOS photography and surveillance cameras with a chip size of 1 / 3 to 4 / 3 inches. The full field of view can be adjusted between 185-230 degrees. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the structure of a high-resolution optical lens with a large field of view according to an embodiment of the present invention;

[0020] Figure 2 FIG. 4 is a schematic diagram of ray tracing according to an embodiment of the present invention.

[0021] Explanation of the accompanying drawings: 1, first mirror group; 2, second mirror group; 3, third mirror group; 4, fourth mirror group; 5, fifth mirror group; 6, sixth mirror group; 7, seventh mirror group; 8, eighth mirror group; 9, ninth mirror group; 10, tenth mirror group; 11, light barrier. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0023] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc., they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first", "second", etc., they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0025] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0026] The present embodiment relates to an optical lens with ultra-large field of view and high resolution, so as to improve the field of view and resolution of the lens and reduce the cost of the projection lens.

[0027] In terms of overall structure, Figure 1 to Figure 2As shown, the ultra-large field angle high-resolution optical lens comprises: 15 lenses arranged in order from the object plane to the image plane in 10 lens groups; the first lens group 1 is a first lens with negative focal power; the second lens group 2 is a second lens with negative focal power; the third lens group 3 is a third cemented lens with positive focal power; the fourth lens group 4 is a fourth cemented lens with positive focal power; the fifth lens group 5 is a fifth cemented lens with negative focal power; the sixth lens group 6 is a sixth lens with positive focal power; the seventh lens group 7 is a seventh lens with positive focal power; the eighth lens group 8 is an eighth cemented lens with negative focal power; the ninth lens group 9 is a ninth cemented lens with positive focal power; and the tenth lens group 10 is a tenth lens with positive focal power. A light bar 11 is provided between the fifth lens group 5 and the sixth lens group 6.

[0028] By setting up ten mirror groups and fifteen mirrors, when projection on a spherical screen, a circular screen or a special-shaped screen is required, it is not necessary to use multiple camera fusion technology to achieve it. By setting up ten mirror groups and fifteen mirrors, the field of view and resolution of the lens are improved, and the cost required for projection is reduced. At the same time, the optical lens of the present application has a simple structure and low processing difficulty, which significantly reduces the processing cost, and the optical lens has strong tolerance performance.

[0029] Based on the overall introduction above, the optical lens described in this embodiment has a focal length f=1 mm, a relative aperture (D / f)=1 / 2.3, a full field angle 2w=210°, a rear working distance greater than 10.5 mm, and a reverse distance ratio greater than 10. The optical lens adopts a refractive optical path.

[0030] The design method of the optical lens is as follows: first, the basic optical parameters of the entire system are set in the software, and the basic optical parameters include the field of view angle, relative aperture and working wavelength. At the same time, an equivalent parallel plate of a certain thickness is inserted after the rear group to simulate the synthetic prism inside the imaging device, so as to ensure that the finished lens matches the imaging period. Then, the focal length of the system is adjusted to the target value. On this basis, the system is transformed and optimized by adopting a design optimization method combining manual and design software. During the transformation and optimization, it is ensured that the light barrier 11 is located between the front group and the rear group, and is closer to the rear group, so that the optical path difference of each field of view, each aperture and each wavefront of the rear group can be ensured to be small, which is conducive to further optimization and correction of aberrations. The thickness of the equivalent parallel plate varies according to the different imaging devices, and the material varies according to the different imaging devices.

[0031] In the later stage of design optimization, we combine the precise calculation of artificial subdivision aperture and field of view, accurately locate the position of boundary light and characteristic light, find the relationship between various aberrations in the lens, reasonably match the aberrations, and then continuously optimize until the lens structure has good aberration quality, uniform image plane illumination and good processability. During the optimization process, we should pay attention to updating and adjusting various optimization target values ​​at any time.

[0032] When the equivalent focal length of the lens is 1mm, its structural parameters are as follows:

[0033]

[0034] The above-mentioned ultra-large viewing angle high-resolution optical lens has the following uses. After adjusting the air interval between the front and rear groups of the optical lens and the lens curvature radius, it can be used to realize the use of digital projectors with different light sources based on DLP and LCD chips with a size of 0.33-1.38 inches and CCD or CMOS photography and surveillance cameras with a chip size of 1 / 3 to 4 / 3 inches. The full viewing angle can be adjusted between 185-230 degrees. Under the premise of the same imaging quality, i.e., resolution, as other existing lens structures, all spherical domestic low-cost optical materials are used, the structure is simple, the processing cost is significantly reduced, and the tolerance performance is strong.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-resolution optical lens with a large field of view. It is characterized in that include: Fifteen lenses in ten groups arranged from the object plane to the image plane; The first lens group (1) is a first lens with negative optical power; the second lens group (2) is a second lens with negative optical power; the third lens group (3) is a third cemented lens with positive optical power; the fourth lens group (4) is a fourth cemented lens with positive optical power; the fifth lens group (5) is a fifth cemented lens with negative optical power; the sixth lens group (6) is a sixth lens with positive optical power; the seventh lens group (7) is a seventh lens with positive optical power; the eighth lens group (8) is an eighth cemented lens with negative optical power; the ninth lens group (9) is a ninth cemented lens with positive optical power; and the tenth lens group (10) is a tenth lens with positive optical power.

2. The ultra-large viewing angle and high resolution optical lens according to claim 1, Features: A light barrier (11) is arranged between the fifth lens group (5) and the sixth lens group (6).

3. The ultra-large viewing angle and high resolution optical lens according to claim 1, Features: The optical lens has a focal length f=1 mm, a relative aperture (D / f)=1 / 2.3, a full field angle 2w=210°, a rear working distance greater than 10.5 mm, and a reverse distance ratio greater than 10.

4. The ultra-large viewing angle and high resolution optical lens according to claim 1, Features: The optical lens adopts a refractive light path.

5. A method for manufacturing an ultra-large viewing angle and high-resolution optical lens according to any one of claims 1 to 4, Features: First, the basic optical parameters of the entire system are set: field angle, relative aperture and working wavelength. At the same time, an equivalent parallel plate is inserted after the rear group to simulate the synthetic prism inside the imaging device. Then, the focal length of the system is adjusted to the target value. On this basis, a design optimization method combining manual and design software is used to transform and optimize the system. During the transformation and optimization, it is ensured that the light barrier (11) is located between the front group and the rear group and is closer to the rear group. In the later stage of design optimization, the precise calculation of the manually subdivided aperture and field of view is combined to locate the boundary light and characteristic light positions, find the relationship between various aberrations in the lens, reasonably match the aberrations, and then continuously optimize. During the optimization process, pay attention to updating and adjusting various optimization target values ​​at any time.

6. Use of the ultra-large viewing angle and high-resolution optical lens according to any one of claims 1 to 4, It is characterized in that After adjusting the air gap between the front and rear groups and the curvature radius of the lens, the optical lens can be used for digital projectors with different light sources based on DLP and LCD chips with a size of 0.33-1.38 inches and CCD or CMOS photography and surveillance cameras with a chip size of 1 / 3 to 4 / 3 inches. The full field of view can be adjusted between 185-230 degrees.

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