CN107329352B - Projection lens and projection system - Google Patents
Projection lens and projection system Download PDFInfo
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- CN107329352B CN107329352B CN201710675058.XA CN201710675058A CN107329352B CN 107329352 B CN107329352 B CN 107329352B CN 201710675058 A CN201710675058 A CN 201710675058A CN 107329352 B CN107329352 B CN 107329352B
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- lens
- spherical
- projection
- aspheric
- crescent
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- 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
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
Abstract
The invention discloses a projection lens and a projection system, wherein the projection lens comprises a first spherical biconvex lens, a second spherical biconvex lens or a plano-convex lens, an aspheric biconvex lens, a spherical biconcave lens, a third spherical biconvex lens, a first spherical crescent lens or a plano-convex lens, a second spherical crescent lens, a third spherical crescent lens and an aspheric crescent lens or a plano-concave lens which are coaxially and sequentially arranged along an axis, and the projection system comprises a display device, a prism and any one of the projection lenses. The projection lens is matched with a DMD or LCOS display device for use, light beams modulated by the display device are collected and focused on a display screen, the projection lens has the characteristics of large display size and high light utilization efficiency, and the lens comprises two aspheric lenses, so that the number of lens lenses is small while the thermal stability of the lens is ensured, the cost is reduced, and the influence of assembly tolerance is reduced.
Description
Technical Field
The invention relates to the technical field of image display, in particular to a projection lens and a projection system.
Background
In the existing Digital projection display technology, a DMD (Digital Micromirror Device) or an LCOS (Liquid Crystal On Silicon) is mainly used as a display Device, a Polarization Beam Splitter (PBS) or a total reflection beam splitter (TIR) is used as an illumination/imaging beam splitter, and an image reflected from the display Device is focused On a display screen through a projection lens optical path designed reasonably. In the prior art, in order to obtain good display image quality and larger picture size (projection ratio < 1.5), the projection lens is generally complex in structure, the number of lens lenses is generally more than 14, so that the processing and assembly processes are complex, the yield is not easy to control, and the conventional projection lens is generally expensive and has uneven display image quality.
Disclosure of Invention
The invention provides a projection lens and a projection system, aiming at the defects of the prior art, and overcoming the defects of the prior art that the number of lenses of the projection lens and the projection system is large, and the processing and assembling processes are complex.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a projection lens comprises a first spherical biconvex lens, a second spherical biconvex lens or a plano-convex lens, an aspheric biconvex lens, a spherical biconcave lens, a third spherical biconvex lens, a first spherical crescent lens or a plano-convex lens, a second spherical crescent lens, an aspheric crescent lens or a plano-concave lens and a third spherical crescent lens which are coaxially and sequentially arranged along an axis.
According to an embodiment of the present invention, the aspherical biconvex lens, the spherical biconcave lens and the third spherical biconvex lens are cemented to form a cemented triplet.
According to an embodiment of the present invention, an aspherical shape of the aspherical biconvex lens, the aspherical meniscus lens or the plano-concave lens satisfies the following polynomial expression:
where Z denotes a distance in the optical axis direction from a point on the aspherical surface to the vertex of the aspherical surface, r denotes a distance from a point on the aspherical surface to the optical axis, c denotes a central curvature of the aspherical surface, k denotes a conicity, and a4, a6, a8, a10, a12, a14, a16 denote aspherical high-order term coefficients.
A projection system comprising a display device, a prism and a projection lens according to any one of claims 1 to 3 coaxially arranged in sequence along an axis.
According to an embodiment of the present invention, a cover glass is provided at a front end of the display device.
According to an embodiment of the invention, a diaphragm is arranged between the lenses of the projection lens.
According to an embodiment of the present invention, the diaphragm is disposed between the third spherical biconvex lens, the first spherical crescent lens or between the third spherical biconvex lens and the plano-convex lens.
The technical scheme of the invention has the following beneficial effects: the projection lens is matched with a DMD or LCOS display device for use, light beams modulated by the display device are collected and focused on a display screen, the projection lens has the characteristics of large display size and high light utilization efficiency, and the lens comprises two aspheric lenses, so that the number of lens lenses is small while the thermal stability of the lens is ensured, the cost is reduced, and the influence of assembly tolerance is reduced.
Drawings
The advantages and realisation of the invention will be more apparent from the following detailed description, given by way of example, with reference to the accompanying drawings, which are given for the purpose of illustration only, and which are not to be construed in any way as limiting the invention, and in which:
FIG. 1 is a schematic view of a first projection system according to an embodiment of the present invention;
FIG. 2 is a light ray trace diagram illustrating a first exemplary projection system according to the present invention;
FIG. 3 is a schematic representation of the MTF of the modulus transfer function of the first projection system according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating distortion of an optical system according to a first embodiment of the present invention;
FIG. 5 is a vertical axis aberration diagram for a first projection system according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a second projection system according to an embodiment of the present invention;
FIG. 7 is a light ray trace diagram of a second embodiment of a projection system according to the invention;
FIG. 8 is a diagram illustrating a modulus transfer function MTF of a second projection system according to an embodiment of the present invention;
FIG. 9 is a diagram illustrating distortion of an optical system according to a second embodiment of the present invention;
FIG. 10 is a diagram of a vertical axis chromatic aberration of a second projection system according to an embodiment of the present invention;
FIG. 11 is a schematic view of a third projection system according to an embodiment of the present invention;
FIG. 12 is a light ray trace diagram illustrating a third exemplary embodiment of a projection system according to the invention;
FIG. 13 is a diagram illustrating a modulus transfer function MTF of a third projection system according to an embodiment of the present invention;
FIG. 14 is a diagram illustrating distortion of an optical system according to a third embodiment of the present invention;
FIG. 15 is a vertical axis color difference diagram of a third projection system according to an embodiment of the present invention;
FIG. 16 is a schematic view of a fourth projection system according to an embodiment of the present invention;
FIG. 17 is a light ray trace diagram illustrating a fourth exemplary projection system according to the invention;
FIG. 18 is a diagram showing a MTF of a modulus transfer function in a fourth projection system according to an embodiment of the present invention;
FIG. 19 is a diagram illustrating distortion of an optical system according to a fourth embodiment of the present invention;
FIG. 20 is a vertical axis color difference diagram of a fourth projection system according to an embodiment of the present invention.
Detailed Description
The projection lens comprises a first spherical biconvex lens 1, a second spherical biconvex lens 2 or a plano-convex lens, an aspheric biconvex lens 3, a spherical biconcave lens 4, a third spherical biconvex lens 5, a first spherical crescent lens 6 or a plano-convex lens, a second spherical crescent lens 7, an aspheric crescent lens 8 or a plano-concave lens and a third spherical crescent lens 9 which are coaxially and sequentially arranged along an axis. According to the embodiment of the present invention, the aspherical biconvex lens 3, the spherical biconcave lens 4 and the third spherical biconvex lens 5 are cemented to form a cemented triplet. The aspherical shape of the aspherical biconvex lens 3, the aspherical crescent lens 8 or the plano-concave lens satisfies the following polynomial expression:
where Z denotes a distance in the optical axis direction from a point on the aspherical surface to the vertex of the aspherical surface, r denotes a distance from a point on the aspherical surface to the optical axis, c denotes a central curvature of the aspherical surface, k denotes a conicity, and a4, a6, a8, a10, a12, a14, a16 denote aspherical high-order term coefficients.
The projection system of the present invention comprises the display device 10, the prism 11 and the projection lens as described above, which are coaxially arranged in sequence along an axis. According to the embodiment of the present invention, a cover glass is provided at the front end of the display device 10. Between the lenses of the projection lens a diaphragm 12 is arranged. The diaphragm 12 is arranged between the third spherical biconvex lens 5 and the first spherical crescent lens 6 or between the third spherical biconvex lens 5 and the plano-convex lens.
TABLE 1 lens parameter Table
In table 1 above, f': projection imaging system focal length (in mm), fi': focal length of each lens (in mm), rij: when the radii (in mm) of the respective refractive surfaces are aspherical, the reciprocal of the central curvature, i.e., 1/c, ti: center thickness (in mm) of each lens, di: spacing (in mm) between the posterior apex of each lens to the next lens or optical surface, ds: stop-to-next-lens-vertex spacing, i: lens number, j: the front and back refracting surfaces of the ith lens. Among the above-mentioned lenses, a spherical biconvex lens [ L3], a spherical biconcave lens [ L4] and a spherical biconvex lens [ L5] are cemented into a triple cemented lens.
Referring to figures 1, 2, 3, 4 and 5 for a first projection system embodiment of the present invention,
TABLE 2 first projection System embodiment optical System parameters
| Parameter(s) | Unit of | Numerical value | Remarks for note |
| Half field angle | ° | 42.68 | - |
| Focal length | mm | 8.50 | - |
| Object space numerical aperture | 0.2676 | - | |
| MTF | ％ | >53％ | Details of spatial frequency 0.87lp/mm are shown in FIG. 3 |
| Distortion of | ％ | <0.74％ | See figure 4 for details |
| Color difference of vertical axis | μm | ≤177.3 | See FIG. 5 for details, half pixel size 287 μm |
Table 3 optical path specific parameter table of the first projection system embodiment
Note: x along the long side direction of the display area, y along the short side direction, z along the light advancing direction, and a right-hand coordinate system. The radius is the radius of curvature of the lens, and the inverse of the central curvature, namely 1/c, is adopted in the case of an aspherical surface. The thickness is the lens center thickness. The spacing is the distance from the back vertex of each lens to the next lens or optical surface.
TABLE 4 aspheric parameter Table for the first projection System embodiment
As shown in figures 6, 7, 8, 9 and 10 for a second projection system embodiment of the present invention,
TABLE 5 second projection System embodiment optical System parameters
| Parameter(s) | Unit of | Numerical value | Remarks for note |
| Half field angle | ° | 46.28 | - |
| Focal length | mm | 7.50 | - |
| Object space numerical aperture | 0.2545 | - | |
| MTF | ％ | >56％ | Spatial frequency 0.84, see FIG. 8 for details |
| Distortion of | ％ | <0.93％ | See figure 9 for details |
| Color difference of vertical axis | μm | ≤300.9 | Half-pixel size 298 μm, see FIG. 10 for details |
TABLE 6 light path detailed parameter Table for the second projection System embodiment
Note: x along the long side direction of the display area, y along the short side direction, z along the light advancing direction, and a right-hand coordinate system. The radius is the radius of curvature of the lens, and when the lens is aspherical, the inverse of the central curvature, namely 1/c, is used. The thickness is the lens center thickness. The spacing is the distance from the back vertex of each lens to the next lens or optical surface.
TABLE 7 example two aspheric parameter Table
Referring to figures 11, 12, 13, 14 and 15 for a third embodiment of the projection system of the present invention,
TABLE 8 third projection System embodiment optical System parameters
| Parameter(s) | Unit of | Numerical value | Remarks to note |
| Half field angle | ° | 39.23 | - |
| Focal length | mm | 9.50 | - |
| Object space numerical aperture | 0.2676 | - | |
| MTF | ％ | >45％ | Spatial frequency 0.84, see FIG. 13 for details |
| Distortion of | ％ | <0.72％ | See FIG. 14 for details |
| Color difference of vertical axis | μm | ≤228 | Half pixel size 297 μm, see FIG. 15 for details |
TABLE 9 optical path detailed parameter Table for the third projection System embodiment
Note: x along the long side direction of the display area, y along the short side direction, z along the light advancing direction, and a right-hand coordinate system. The radius is the radius of curvature of the lens, and when the lens is aspherical, the inverse of the central curvature, namely 1/c, is used. The thickness is the lens center thickness. The spacing is the distance from the back vertex of each lens to the next lens or optical surface.
TABLE 10 third projection System embodiment aspheric parameter Table
Referring to figures 16, 17, 18, 19 and 20 for a fourth projection system embodiment of the present invention,
TABLE 11 fourth projection System embodiment optical System parameters
| Parameter(s) | Unit of | Numerical value | Remarks for note |
| Half field angle | ° | 36.54 | - |
| Focal length | mm | 10.42 | - |
| Object space numerical aperture | 0.2676 | - | |
| MTF | ％ | >49％ | Spatial frequency 0.84, see FIG. 18 for details |
| Distortion of | ％ | <0.95％ | See FIG. 19 for details |
| Color difference of vertical axis | μm | ≤196 | Half pixel size 298 μm, see FIG. 20 for detail |
TABLE 12 optical path detailed parameter Table for the fourth projection System embodiment
Note: x along the long side direction of the display area, y along the short side direction, z along the light advancing direction, and a right-hand coordinate system. The radius is the radius of curvature of the lens, and when the lens is aspherical, the inverse of the central curvature, namely 1/c, is used. The thickness is the lens center thickness. The spacing is the distance from the back vertex of each lens to the next lens or optical surface.
TABLE 13 fourth projection System embodiment aspheric parameter Table
As will be apparent to those skilled in the art, many modifications can be made to the invention without departing from the spirit and scope thereof, and it is intended that the present invention cover all modifications and equivalents of the embodiments of the invention covered by the appended claims.
Claims (4)
1. A projection lens, characterized in that: the lens comprises a first spherical biconvex lens, a second spherical biconvex lens or a plano-convex lens, an aspheric biconvex lens, a spherical biconcave lens, a third spherical biconvex lens, a diaphragm, a first spherical crescent lens or a plano-convex lens, a second spherical crescent lens, an aspheric crescent lens or a plano-concave lens and a third spherical crescent lens which are coaxially and sequentially arranged along an axis;
the aspheric surface shape of the aspheric surface biconvex lens, the aspheric surface crescent lens or the plano-concave lens satisfies the following polynomial expression:
wherein Z represents the distance in the optical axis direction of a point on the aspherical surface from the vertex of the aspherical surface, r represents the distance from the point on the aspherical surface to the optical axis, c represents the central curvature of the aspherical surface, k represents the conicity, a 4 、 a 6 、 a 8 、 a 10 、 a 12 、 a 14 、 a 16 Representing aspheric high-order term coefficients.
2. The projection lens of claim 1, wherein: the aspheric biconvex lens, the spherical biconcave lens and the third spherical biconvex lens are cemented to form a tri-cemented lens.
3. A projection system, characterized by: comprising a display device, a prism and a projection lens according to claim 1 or 2, arranged coaxially in sequence along an axis.
4. The projection system of claim 3, wherein: and the front end of the display device is provided with protective glass.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710675058.XA CN107329352B (en) | 2017-08-09 | 2017-08-09 | Projection lens and projection system |
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| CN201710675058.XA CN107329352B (en) | 2017-08-09 | 2017-08-09 | Projection lens and projection system |
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| CN107329352B true CN107329352B (en) | 2022-11-11 |
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| CN114355717A (en) * | 2022-01-14 | 2022-04-15 | 苏州石头记智能科技有限公司 | Digital film exposure device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789044A (en) * | 2012-08-08 | 2012-11-21 | 中国科学院长春光学精密机械与物理研究所 | Aspherical focal length-variable photoetching objective lens system |
| CN104360465A (en) * | 2014-10-20 | 2015-02-18 | 东莞市普密斯精密仪器有限公司 | Zooming telecentric lens |
| CN104570296A (en) * | 2014-12-17 | 2015-04-29 | 深圳市亿思达科技集团有限公司 | Ultra-short focus projection lens |
| CN207051641U (en) * | 2017-08-09 | 2018-02-27 | 深圳市安华光电技术有限公司 | A kind of projection lens and optical projection system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789044A (en) * | 2012-08-08 | 2012-11-21 | 中国科学院长春光学精密机械与物理研究所 | Aspherical focal length-variable photoetching objective lens system |
| CN104360465A (en) * | 2014-10-20 | 2015-02-18 | 东莞市普密斯精密仪器有限公司 | Zooming telecentric lens |
| CN104570296A (en) * | 2014-12-17 | 2015-04-29 | 深圳市亿思达科技集团有限公司 | Ultra-short focus projection lens |
| CN207051641U (en) * | 2017-08-09 | 2018-02-27 | 深圳市安华光电技术有限公司 | A kind of projection lens and optical projection system |
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Address after: 518067 3C, 3D, Block CD, Building 7, Xinghua Industrial Building, No. 4, Industrial 6th Road, Huaguoshan Community, Merchants Street, Nanshan District, Shenzhen, Guangdong Province Patentee after: Shenzhen Anhua Photoelectric Technology Co.,Ltd. Address before: 518000 room 201-202, building D, Chuangye No.1, 43 Yanshan Road, Shekou, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN ANHUA OPTOELECTRONICS TECHNOLOGY Co.,Ltd. |