CN114755807A - Reflective wide-angle lens - Google Patents

Reflective wide-angle lens Download PDF

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Publication number
CN114755807A
CN114755807A CN202210143869.6A CN202210143869A CN114755807A CN 114755807 A CN114755807 A CN 114755807A CN 202210143869 A CN202210143869 A CN 202210143869A CN 114755807 A CN114755807 A CN 114755807A
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lens
lens group
group
lenses
cemented
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CN202210143869.6A
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Chinese (zh)
Inventor
苏文露
孔建平
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Jiangxi Xingchi Electronic Technology Co.,Ltd.
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Fujian Ruichi Intelligent Technology Research Institute Co ltd
Quanzhou Ruichi Intelligent Technology Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/142—Adjusting of projection optics
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/28—Reflectors in projection beam

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention provides a reflective wide-angle lens for projecting light rays from a display assembly, which comprises a first lens group, a second lens group and a curved reflector, wherein the first lens group is used for receiving the light rays from the display assembly and comprises at least one group of three cemented lenses, at least one first aspheric lens and at least one group of first doubly-cemented lens, the second lens group is used for receiving the light rays from the first lens group and comprises at least two second aspheric lenses and one group of second doubly-cemented lenses, and the focal lengths of the first lens group, the second lens group and the concave reflector are respectively f1、f2And f3The relationship between the trifocal distances satisfies: 3.4 < | f2/f1< 4.25 and 1.1 < | f3/f1And | is less than 1.45. The invention has large aperture and small throw ratio, uses less optical lenses, does not need to independently adjust some lenses during production, has simple process and is beneficial to mass production.

Description

Reflective wide-angle lens
Technical Field
The invention relates to a reflective wide-angle lens.
Background
With the development of the key projection components, the resolution of the display components has reached 4K/2K, and the brightness of the light source is increasingly increased whether the light source is an LED or a laser, so that the projection products enter the home market more mature.
The short-focus projection can greatly shorten the distance between the projector and the screen, and can project hundreds of inches of pictures by only needing dozens of centimeters of projection distance, the short-focus projector can be placed on a television cabinet, is the same as the general television in position, saves more space and has the advantages of installation and the like compared with the general long-focus projector, and therefore the short-focus projection is more practical in use than the general projector.
In recent years, short-focus projection technology has gradually become the focus of the market, and the throw ratio of the current short-focus projection is about between 0.24 and 0.65, but it is still technically difficult to achieve an ultra-short-focus lens with a throw ratio below 0.2. In addition, in the case of using a large aperture projection lens to increase brightness, in order to achieve a smaller throw ratio, the lens light-emitting angle must have a larger incident angle to the screen, which not only generates more optical aberrations, but also easily causes distortion of the projected image due to a very short throw distance, and if these undesirable phenomena are to be eliminated, more lenses are required to be used for solving the problems, but more lenses cause assembly errors, and the accumulated assembly errors cause poor quality of the projected image.
Disclosure of Invention
The invention provides a reflective wide-angle lens, which has large aperture and small projection ratio, uses less optical lenses, does not need to independently adjust some lenses during production, has simple process and is beneficial to mass production.
The invention is realized by the following technical scheme:
a reflective wide-angle lens for projecting light from a display module comprises a first lens group for receiving light from the display module, at least one third cemented lens, at least one first aspheric lens, at least one first biconjugate lens, a second lens group for receiving light from the first lens group, at least two second aspheric lenses and a second biconjugate lens, wherein the focal lengths of the first and second lens groups and the concave reflector are f1、f2And f3The relationship between the trifocal distances satisfies: 3.4 < | f2/f1< 4.25 and 1.1 < | f3/f1|＜1.45。
Further, the first lens group, the second lens group and the curved reflector have the same optical axis.
Furthermore, the first lens group comprises a first aspheric lens, a group of three cemented lenses, an aperture diaphragm and a group of first cemented doublet lenses which are sequentially arranged along the light advancing direction.
Further, the second lens group includes a second aspheric lens, a group of second doublet lenses and another second aspheric lens sequentially arranged along the light advancing direction.
Further, the second lens group may move back and forth in focus.
Furthermore, the curved surface reflector is an inward concave optical axis symmetric aspheric surface curved surface reflector.
Furthermore, the three cemented lenses comprise two outer lenses and a central lens arranged between the two outer lenses, the outer lenses have negative refraction, and the central lens has positive refraction.
The invention has the following beneficial effects:
1. the first lens group comprises a cemented triplet and a cemented doublet, the second lens group comprises a cemented doublet, and the relationship between the focal lengths of the first and second lens groups and the concave reflector satisfies 3.4 < | f2/f1< 4.25 and 1.1 < | f3/f1< 1.45, thereby shortening the overall size of the wide-angle lens and achieving a very small projection ratio (TR)<The lens group has at least 10 lenses, although the first lens group and the second lens group have, each lens group only needs to be assembled 3 times, which can ensure that the assembly is simple, the assembly error caused by less assembly times is less, and the production process is simple, thereby not only realizing the requirement of mass production of the wide-angle lens, but also improving the yield of the wide-angle lens.
2. The first lens group comprises a first aspheric lens, a group of three cemented lenses, an aperture diaphragm and a group of first double cemented lenses which are sequentially arranged along the advancing direction of light rays, the resolution of the wide-angle lens can be improved, the axial chromatic aberration and the lateral chromatic aberration of the optical system can be reduced, the number of lenses used by the three cemented lenses can be reduced, and the size of the lens can be shortened.
3. The second lens group comprises a second aspheric lens, a group of second double-cemented lenses and another second aspheric lens which are sequentially arranged along the light advancing direction, so that the aberration generated in the diagonal process of the lens can be eliminated, the optical times can be reduced, and the influence can be kept clear under the condition of different projection sizes.
4. The second lens group can move back and forth in a focusing manner, and the projection image can be kept clear for different projection distances.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic view of the present invention.
FIG. 2 is a diagram of the modulation transfer function for a projection size of 110 inches according to the present invention.
FIG. 3 is a diagram of the modulation transfer function for a projection size of 100 inches according to the present invention.
FIG. 4 is a graph of the modulation transfer function for a 90 "projection size according to the present invention.
1, prism group; 21. a first aspherical lens; 22. a tri-cemented lens; 23. an aperture diaphragm; 24. a first cemented doublet lens; 31. a second aspherical lens; 32. a second cemented doublet lens; 4. a curved reflector; 5. a galvanometer.
Detailed Description
The reflective wide-angle lens is used to project light from the display assembly, and has a high resolution, a large aperture (FNO 1.7 in this embodiment), and a low throw ratio (0.19 in this embodiment). As shown in fig. 1, the reflective wide-angle lens includes a first lens group, a second lens group and a curved reflector 4, the first lens group, the second lens group and the curved reflector 4 have the same optical axis, the first lens group is used for receiving light from the display module and includes at least one set of three cemented lenses 22, at least one piece of first aspheric lens 21 and at least one set of first cemented doublet 24, the second lens group is used for receiving light from the first lens group and can move in a front-back focusing manner and includes at least two pieces of second aspheric lenses 31 and a set of second cemented doublet 32, the focal lengths of the first lens group, the second lens group and the curved reflector are f respectively1、f2And f 3The relationship between the three focal lengths satisfies: 3.4 < | f2/f1< 4.25 and 1.1 < | f3/f1< 1.45. The light rays from the A-side display assembly sequentially pass through the prism group 1, the first lens group and the second lens group and then are reflected to the curved surface reflector 4The screen, the second lens group can focus adjustment around the projection screen size position is different to reach clear projection image, wherein, the display module can be light source modulation subassembly such as Cathode Ray Tube (CRT), Liquid Crystal Display (LCD), digital micro mirror device (DMD), silicon-based liquid crystal (LCoS), can modulate the definition of display module through changing galvanometer 5.
In the present embodiment, the first lens group includes a first aspheric lens 21, a set of three cemented lenses 22, an aperture stop 23 and a set of first cemented doublet lenses 24 sequentially arranged along the light advancing direction. The three-in-one plastic lens comprises two outer side lenses and a central lens arranged between the two outer side lenses, wherein the outer side lenses have negative refraction, and the central lens has positive refraction. The second lens group includes a second aspheric lens 31, a set of second doublet 32 and another second aspheric lens 31 sequentially arranged along the light advancing direction, and in other embodiments, the doublet may also be a spherical lens. The curved reflector 4 is a concave optical axis symmetric aspheric curved reflector 4 for reflecting the light passing through the first lens group and the second lens group from the display device and correcting the distortion aberration caused by the first lens group and the second lens group.
In the present embodiment, the curved surface reflector 4 is disposed on the same optical axis of the first lens group and the second lens group, but in other embodiments, the curved surface reflector 4 may be disposed at a position shifted or deflected upward or downward by an angle with respect to the optical axis, in which case, it is sufficient that the distance in the optical axis direction from the vertex of the lens closest to the display element of the first lens group to the center point of the curved surface reflector 4 is kept constant.
As shown in fig. 1-1, the curved mirror 4 includes a mirror surface S1, a second aspheric lens 31 includes a mirror surface S2 and a mirror surface S3 in the second lens group, a second cemented doublet 32 includes a mirror surface S4, a mirror surface S5 and a mirror surface S6, another second aspheric lens 31 includes a mirror surface S7 and a mirror surface S8 in the first lens group, a first cemented doublet 24 includes a mirror surface S9, a mirror surface S10 and a mirror surface S11 in the first lens group, a cemented triplet 22 includes a mirror surface S12, a mirror surface S13, a mirror surface S14 and a mirror surface S15 in the first lens group, a first aspheric lens 21 includes a mirror surface S16 and a mirror surface S17, a galvanometer 5 includes a mirror surface 18 and a mirror surface 19, and a prism group 1 includes a mirror surface 20, a mirror surface 21, a mirror surface 22, a mirror surface 23 and an imaging surface.
Examples of parameters of the mirror surfaces in the present embodiment are shown in tables 1 to 2, where table 1 shows the radius of curvature, thickness and material parameter (i.e., refractive index) of each mirror surface, and the thickness refers to the distance from the intersection point position of the mirror surface/screen and the optical axis to the next mirror surface (in other words, the noted thickness is the thickness of the lens or the separation distance between the mirror surface and the next mirror surface). For example, the thickness of the screen column is the distance from the screen to the mirror S1, the thickness of the mirror S1 column is the distance from the mirror S1 to the mirror S2, and the thickness of the mirror S2 column is the distance from the mirror S2 to the mirror S3 (i.e., the thickness of the lens 31). It will be understood that the dimensions described herein are exaggerated and minimized in scale and, thus, are not in units marked.
TABLE 1
Figure BDA0003507872080000051
Figure BDA0003507872080000061
Figure BDA0003507872080000071
TABLE 2
Figure BDA0003507872080000072
Figure BDA0003507872080000081
Figure BDA0003507872080000091
The parameters of the aspherical mirror surfaces S1, S2, S3, S7, S8, S16, S17 are detailed in table 2, where K is the conic constant and AR is the aspherical coefficient.
The coordinate parameters (origin of coordinates defined at the vertex of the lens) of the mirror surfaces can be obtained by substituting the parameters in the above table into the following formula, and the formula for calculating the aspheric constants of the mirror surfaces S1-S3 is:
X＝Y/NRADIUS；
Figure BDA0003507872080000092
for the mirror surfaces S7-S8, S16-S17, the calculation formula of the aspheric constants is as follows:
Figure BDA0003507872080000093
where CURV is the reciprocal of the above-mentioned radius of curvature, NRADIUS means the radius of curvature of the mirror surface, and A, B, C and D are aspheric coefficients.
TABLE 3
f1 8.94
f2 37.90
f3 12.00
|f2/f1|＝ 4.24
|f3/f1|＝ 1.34
Table 3 shows the focal lengths f of the first lens group, the second lens group and the concave mirror according to the parameters used in this embodiment1、f2And f3The relationship of the three focal lengths meets the two conditional expressions. Although the parameters of a preferred embodiment have been described in detail above, it should be understood that the above parameters are exemplary only and not limiting, and that one skilled in the art can modify the parameters without departing from the framework and scope of the present disclosure while still satisfying the two conditions described in the present disclosure.
Fig. 2-4 show the modulation transfer functions of the present embodiment when projecting projection sizes of 110 inches, 100 inches, and 90 inches, respectively, and it can be seen from the figures that the modulation transfer functions can reach above 0.5 under various projection sizes, so the wide-angle lens of the present embodiment has sufficient margin to compensate the tolerance during assembly during production and assembly, and the lens inside does not need to be adjusted separately during production, and the process is simple, thereby meeting the requirement of mass production of the wide-angle lens.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, and the equivalent variations and modifications made in the claims and the description of the present invention should be included in the scope of the present invention.

Claims (7)

1. A reflective wide-angle lens for projecting light from a display module, comprising: comprises a first lens group, a second lens group and a curved reflector, wherein the first lens group is used for receiving light rays from a display component and comprises at least one group of three cemented lensesThe second lens group is used for receiving light rays from the first lens group and comprises at least two second aspheric lenses and a group of second double-cemented lenses, and the focal lengths of the first lens group, the second lens group and the concave reflector are respectively f1、f2And f3The relationship between the three focal lengths satisfies: 3.4 < | f2/f1< 4.25 and 1.1 < | f3/f1|＜1.45。
2. A reflective wide-angle lens as claimed in claim 1, wherein: the first lens group, the second lens group and the curved reflector have the same optical axis.
3. A reflective wide-angle lens as claimed in claim 1, wherein: the first lens group comprises a first aspheric lens, a group of three cemented lenses, an aperture diaphragm and a group of first cemented doublet lenses which are sequentially arranged along the advancing direction of light rays.
4. A reflective wide-angle lens according to claim 1, 2 or 3, wherein: the second lens group comprises a second aspheric lens, a group of second double-cemented lenses and another second aspheric lens which are sequentially arranged along the light advancing direction.
5. A reflective wide-angle lens according to claim 1, 2 or 3, wherein: the second lens group is movable in front and rear focus.
6. A reflective wide-angle lens according to claim 1, 2 or 3, wherein: the curved surface reflector is an inward concave type optical axis symmetrical aspheric surface curved surface reflector.
7. A reflective wide-angle lens according to claim 3, wherein: the tri-cemented lens comprises two outer side lenses and a central lens arranged between the two outer side lenses, wherein the outer side lenses are negative refraction lenses, and the central lens is positive refraction lenses.
CN202210143869.6A 2021-10-14 2022-02-17 Reflective wide-angle lens Pending CN114755807A (en)

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CN202111195391.3A CN113641064A (en) 2021-10-14 2021-10-14 Reflective wide-angle lens

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Publication number Priority date Publication date Assignee Title
CN106125265B (en) * 2016-08-17 2019-04-09 海信集团有限公司 Projection imaging system
TWM554571U (en) * 2017-09-13 2018-01-21 孔建平 Reflective type wide angle lens
CN213876160U (en) * 2020-11-06 2021-08-03 福建省锐驰智能技术研究院有限责任公司 Reflective wide-angle lens

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Effective date of registration: 20221107

Address after: 344000 Building B7, School Furniture Industrial Park, Nancheng County, Fuzhou City, Jiangxi Province

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Address before: 362000 no.463 Chonghong street, Quanzhou Economic and Technological Development Zone, Fujian Province

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