Ultra-wide field-of-view high-resolution optical lenses, their manufacturing methods and applications

Abstract

This invention provides an ultra-wide field-of-view, high-resolution optical lens, comprising: fifteen lenses in ten groups arranged sequentially from the object plane to the image plane; a first lens group consisting of a first lens with negative optical power; a second lens group consisting of a second lens with negative optical power; a third lens group consisting of a third cemented lens with positive optical power; a fourth lens group consisting of a fourth cemented lens with positive optical power; a fifth lens group consisting of a fifth cemented lens with negative optical power; a sixth lens group consisting of a sixth lens with positive optical power; a seventh lens group consisting of a seventh lens with positive optical power; an eighth lens group consisting of an eighth cemented lens with negative optical power; a ninth lens group consisting of a ninth cemented lens with positive optical power; and a tenth lens group consisting of a tenth lens with positive optical power. This invention improves the field of view and resolution of the lens, thereby reducing the cost of special projection engineering projects.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and in particular to a high-resolution optical lens with an ultra-wide field of view, as well as a method for manufacturing the ultra-wide field of view high-resolution optical lens and its applications. Background Technology

[0002] With the development of optical imaging technology, various exhibition and display projects, dome theater projects, monitoring, drone aerial photography or identification camera projects have increasingly higher requirements for lenses; in particular, the demand for ultra-wide field of view and high resolution optical lenses has been increasing in recent years; at present, the projection of dome, panoramic and irregularly shaped screens on the market is mostly achieved by multi-projector fusion technology, which is very expensive in terms of personnel, equipment and materials, so the cost of such projects remains high. Summary of the Invention

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

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

[0005] A high-resolution optical lens with an ultra-wide field of view includes:

[0006] A ten-lens group with fifteen lenses arranged sequentially from the object plane to the image plane;

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

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

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

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

[0011] A method for manufacturing the aforementioned ultra-wide field-of-view high-resolution optical lens first sets the basic optical parameters of the entire system: field of view, relative aperture, and operating wavelength. Simultaneously, an equivalent parallel plate is inserted after the rear group to simulate the internal synthesizing prism of the imaging device. Then, the system focal length is adjusted to the target value. Based on this, a design optimization method combining manual intervention and design software is used to modify and optimize the system. During modification and optimization, it is ensured that the aperture stop is located between the front and rear groups, and closer to the rear group.

[0012] In the later design optimization, the precise calculation of aperture and field of view is combined with manual subdivision to locate the positions of boundary rays and feature rays, find the relationship between various aberrations in the lens, and reasonably match the aberrations. Then, through continuous optimization, attention is paid to updating and adjusting various optimization target values ​​at any time during the optimization process.

[0013] One application of the aforementioned ultra-wide field-of-view high-resolution optical lens is that, after adjusting the air gap between the front and rear groups and the radius of curvature of the lens, it can be used for digital projectors with different light sources based on DLP and LCD chip sizes ranging from 0.33 to 1.38 inches, as well as for CCD or CMOS photography and surveillance cameras with chip sizes ranging from 1 / 3 to 4 / 3 inches. The full field of view can be adjusted between 185 and 230 degrees.

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

[0015] The ultra-wide field of view high-resolution optical lens of this invention, by setting up a ten-lens group of fifteen lenses, eliminates the need for multi-camera fusion technology when projecting onto dome screens, panoramic screens, and irregularly shaped screens. The setting of ten-lens group of fifteen lenses improves the field of view and resolution of the lens, and reduces the cost required for the projection system. At the same time, the optical lens of this application has a simple structure, low processing difficulty, significantly reduces processing costs, and the optical lens has strong tolerance performance.

[0016] Secondly, the lens features an ultra-wide field of view (185-230 degrees), high resolution, high contrast, and good chromatic aberration correction.

[0017] In addition, this optical lens has good applicability, meaning it is suitable for different application scenarios. After adjusting the air gap between the front and rear groups and the radius of curvature of the lens, it can be used for digital projectors with different light sources, such as DLP and LCD chip sizes ranging from 0.33 to 1.38 inches, as well as CCD or CMOS photography and surveillance cameras with chip sizes ranging from 1 / 3 to 4 / 3 inches. The full field of view can be adjusted between 185 and 230 degrees. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

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

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

[0021] Explanation of reference numerals in the attached diagram: 1. First lens group; 2. Second lens group; 3. Third lens group; 4. Fourth lens group; 5. Fifth lens group; 6. Sixth lens group; 7. Seventh lens group; 8. Eighth lens group; 9. Ninth lens group; 10. Tenth lens group; 11. Aperture. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0023] In the description of this invention, it should be noted that the use of terms such as "upper," "lower," "inner," and "outer," indicating orientation or positional relationship, is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the use of terms such as "first" and "second" is also for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] Furthermore, in the description of this invention, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention in light of the specific circumstances.

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

[0026] This embodiment relates to an ultra-wide field-of-view high-resolution optical lens to improve the field of view and resolution of the lens, thereby reducing the cost of the projection lens.

[0027] In terms of overall structure, such as Figures 1 to 2As shown, this ultra-wide field-of-view, high-resolution optical lens includes: fifteen lenses in ten groups arranged sequentially 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. An aperture stop 11 is provided between the fifth lens group 5 and the sixth lens group 6.

[0028] By setting up a ten-lens group with fifteen lenses, when projection is needed on dome screens, circular screens, and irregularly shaped screens, it is not necessary to use multiple camera fusion technology. Setting up a ten-lens group with fifteen lenses improves the field of view and resolution of the lens, and reduces the cost required for projection. At the same time, the optical lens structure of this application is simple, the processing difficulty is low, which significantly reduces the processing cost, and the optical lens has strong tolerance performance.

[0029] Based on the above overview, the optical lens described in this embodiment has a focal length f = 1mm, a relative aperture (D / f) = 1 / 2.3, a full field of view 2w = 210°, a back working distance greater than 10.5mm, and a contrast ratio greater than 10. Furthermore, this optical lens employs a refractive optical path.

[0030] The design method for this optical lens is as follows: First, the basic optical parameters of the entire system are set in the software. These basic optical parameters include the field of view, relative aperture, and working wavelength. Simultaneously, an equivalent parallel plate of a certain thickness is inserted after the rear group to simulate the internal synthesizing prism of the imaging device, ensuring that the finished lens matches the imaging process. Next, the system focal length is adjusted to the target value. Based on this, a design optimization method combining manual intervention and design software is used to modify and optimize the system. During modification and optimization, the aperture stop 11 is positioned between the front and rear groups, and closer to the rear group. This ensures that the optical path difference between each field of view, aperture, and wavefront of the rear group is small, which is beneficial for further aberration optimization and correction. The thickness of the equivalent parallel plate varies depending on the imaging device, and the material also varies depending on the imaging device.

[0031] In the later design optimization stage, precise calculations of aperture and field of view are combined with manual subdivision to accurately locate the positions of boundary rays and characteristic rays, find the interrelationships of various aberrations in the lens, and reasonably match the aberrations. Through continuous optimization, the lens structure is optimized until it achieves good aberration quality, uniform image plane illumination, and excellent manufacturability. During the optimization process, attention is paid to constantly updating and adjusting various optimization target values.

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

[0033]

[0034] The aforementioned ultra-wide field-of-view, high-resolution optical lens has the following applications: After adjusting the air gap between the front and rear elements and the radius of curvature of the lenses, it can be used for digital projectors with different light sources (DLP, LCD chip sizes ranging from 0.33 to 1.38 inches) and for CCD or CMOS photography and surveillance cameras with chip sizes ranging from 1 / 3 to 4 / 3 inches. The full field of view can be adjusted between 185 and 230 degrees. While maintaining the same image quality (resolution) as other existing lens structures, it utilizes all domestically produced, low-cost spherical optical materials, resulting in a simple structure, significantly reduced processing costs, and strong tolerance performance.

[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 principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An ultra-wide field angle high resolution optical lens characterized in that, Ten mirror groups, fifteen lenses arranged in order from object plane to image plane; The first mirror group (1) is a first lens with negative focal length; the second mirror group (2) is a second lens with negative focal length; the third mirror group (3) is a third cemented lens with positive focal length; the fourth mirror group (4) is a fourth cemented lens with positive focal length; the fifth mirror group (5) is a fifth cemented lens with negative focal length; the sixth mirror group (6) is a sixth lens with positive focal length; the seventh mirror group (7) is a seventh lens with positive focal length; the eighth mirror group (8) is an eighth cemented lens with negative focal length; the ninth mirror group (9) is a ninth cemented lens with positive focal length; and the tenth mirror group (10) is a tenth lens with positive focal length. The optical lens has a relative aperture (D / f)=1 / 2.3 and a full field angle 2w=210°.

2. The optical lens according to claim 1, wherein: An aperture stop (11) is arranged between the fifth mirror group (5) and the sixth mirror group (6).

3. The optical lens according to claim 1, wherein: The optical lens has a focal length f=1mm, a back working distance greater than 10.5mm, and a reverse tele ratio greater than 10.

4. The optical lens according to claim 1, wherein: The optical lens adopts a refractive optical path.

5. A manufacturing method of the optical lens according to any one of claims 1-4, wherein: First, the basic optical parameters of the whole system, including the field angle, the relative aperture and the working wavelength, are set, and an equivalent parallel plate is inserted after the rear group to simulate the internal synthetic prism of the imaging device; then, the focal length of the system is adjusted to the target value, and on this basis, a design optimization method combining manual and design software is adopted to modify and optimize the system; during the modification and optimization, the aperture stop (11) is ensured to be located between the front group and the rear group, and closer to the rear group; During the later design optimization, the accurate calculation of the aperture and the field angle is combined with manual subdivision, the positions of the boundary rays and the characteristic rays are located, the mutual relationship of various aberrations in the lens is found, the aberrations are reasonably matched, and then continuous optimization is carried out; during the optimization process, the various optimization target values are updated and adjusted in time.

6. Use of the super-wide field of view high resolution optical lens according to any one of claims 1-4, characterized in that, After adjusting the air gap and the curvature radius of the lenses of the front and rear groups of the optical lens, the lens is used for digital projectors based on DLP, LCD chips with sizes ranging from 0.33 to 1.38 inches, and CCD or CMOS cameras with chip sizes ranging from 1 / 3 to 4 / 3 inches, and the full field angle can be adjusted between 185 and 230 degrees.

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