CN109656002B - Miniature projection lens - Google Patents
Miniature projection lens Download PDFInfo
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- CN109656002B CN109656002B CN201910138777.7A CN201910138777A CN109656002B CN 109656002 B CN109656002 B CN 109656002B CN 201910138777 A CN201910138777 A CN 201910138777A CN 109656002 B CN109656002 B CN 109656002B
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- 239000011521 glass Substances 0.000 claims description 14
- 230000005499 meniscus Effects 0.000 claims description 4
- 239000006059 cover glass Substances 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 15
- 238000003384 imaging method Methods 0.000 abstract description 10
- 238000013461 design Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The embodiment of the application provides a miniature projection lens, which comprises: the first group lens, the diaphragm, the second group lens, the light splitting device and the image source surface are coaxially and sequentially arranged; the first group of lenses has a positive focal length, and the focal length of the first group of lenses is 384.06< f8<86.06; the second group lens is positive focal length, and the focal length of the second group lens is 11.06< f9< 13.06. The application provides a miniature projection lens has increased numerical aperture through optical design, has still guaranteed imaging quality simultaneously.
Description
Technical Field
The present disclosure relates to the field of projection lenses, and more particularly to a miniature projection lens.
Background
With the development of scientific technology, technologies for serving consumers are also emerging continuously, especially in the field of electronic products. As the scenes in which projection devices are applied become increasingly rich and wide, how to design a projection lens that is small in size, good in imaging quality, high in brightness, and low in cost is a matter that one skilled in the art needs to think about.
The focal length of the miniature projection lens in the current market is more than 2, the focal length is less than 1.6, and the imaging quality is easy to meet as the numerical aperture is smaller, but the brightness of the miniature projection lens is reduced as the numerical aperture is smaller, so that the imaging quality is ensured while the numerical aperture is improved.
Disclosure of Invention
The application provides a miniature projection lens for when improving numerical aperture, guaranteed imaging quality.
In view of this, a first aspect of the present application provides a miniature projection lens, comprising:
the first group lens, the aperture diaphragm, the second group lens, the light splitting device and the image source surface are coaxially and sequentially arranged;
the first group of lenses has a positive focal length, and the focal length of the first group of lenses is 384.06< f8<86.06;
the second group lens is positive focal length, and the focal length of the second group lens is 11.06< f9< 13.06.
Optionally, the first group of lenses includes a first lens, a second lens, and a third lens;
the first lens is a convex-concave lens with negative focal power; the second lens is a convex-concave lens with negative focal power; the third lens is a biconvex lens with positive focal power.
Optionally, the effective focal length of the first lens is-12.93 < f1< -10.93; the effective focal length of the second lens is-62.75 < f2< -60.75; the effective focal length of the third lens is 12.3< f3< 14.3.
Optionally, both surfaces of the first lens are aspheric, and a surface with a small radius of curvature among the two surfaces of the first lens faces the aperture stop; both surfaces of the second lens are spherical surfaces; the two surfaces of the third lens are spherical, and the surface with small curvature radius among the two surfaces of the third lens faces the aperture diaphragm.
Optionally, in the first group of lenses, the first lens is a plastic lens, and the second lens and the third lens are glass lenses.
Optionally, the second group of lenses includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens;
the fourth lens is a concave-convex lens with positive focal power; the fifth lens is a concave-convex lens with negative focal power; the sixth lens is a meniscus lens with positive focal power; the seventh lens is a biconvex lens with positive focal power.
Optionally, the effective focal length of the fourth lens is 16.31< f4<18.31; the effective focal length of the fifth lens is-15.83 < f5< -13.83; the effective focal length of the sixth lens is 53.16< f6<55.16; the effective focal length of the seventh lens is 14.18< f7<16.18.
Optionally, both surfaces of the fourth lens are spherical; both surfaces of the fifth lens are spherical surfaces; both surfaces of the sixth lens are spherical surfaces, and both surfaces of the sixth lens face the aperture diaphragm; both surfaces of the seventh lens are spherical surfaces, and a surface with a small radius of curvature among the two surfaces of the seventh lens faces the aperture stop.
Optionally, in the second group of lenses, the fourth lens, the fifth lens and the sixth lens are all glass lenses, and the seventh lens is a plastic lens.
Optionally, a protective glass is further disposed between the light splitting device and the image source surface.
From the above technical solutions, the embodiments of the present application have the following advantages:
in an embodiment of the present application, a miniature projection lens is provided, including: the first group lens, the diaphragm, the second group lens, the light splitting device and the image source surface are coaxially and sequentially arranged; the first group of lenses has a positive focal length, and the focal length of the first group of lenses is 384.06< f8<86.06; the second group lens is positive focal length, and the focal length of the second group lens is 11.06< f9< 13.06. The application provides a miniature projection lens has increased numerical aperture through optical design, has still guaranteed imaging quality simultaneously.
Drawings
FIG. 1 is an optical block diagram of a miniature projection lens according to an embodiment of the present application;
FIG. 2 is a graph of the transfer function MTF of each field of view chip surface of a miniature projection lens according to an embodiment of the present application;
FIG. 3 is a graph of curvature of field and distortion of a miniature projection lens according to an embodiment of the present application;
fig. 4 is a vertical axis color difference chart of a miniature projection lens according to an embodiment of the present application.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The application designs a miniature projection lens, so that the imaging quality is ensured while the numerical aperture is improved.
For ease of understanding, referring to fig. 1, fig. 1 is an optical structure diagram of a micro-projection lens according to an embodiment of the present application, as shown in fig. 1, specifically:
the first group lens, the aperture diaphragm, the second group lens, the light splitting device and the image source surface are coaxially and sequentially arranged;
the first group lens is positive in focal length, and the focal length of the first group lens is 384.06< f8<86.06;
the second group lens is positive focal length, and the focal length of the second group lens is 11.06< f9< 13.06.
In the embodiment of the present application, the light splitting device is a prism.
In an embodiment of the present application, a miniature projection lens is provided, including: the first group lens, the diaphragm, the second group lens, the light splitting device and the image source surface are coaxially and sequentially arranged; the first group of lenses has a positive focal length, and the focal length of the first group of lenses is 384.06< f8<86.06; the second group lens is positive focal length, and the focal length of the second group lens is 11.06< f9< 13.06. The application provides a miniature projection lens has increased numerical aperture through optical design, has still guaranteed imaging quality simultaneously.
Further, the first group of lenses includes a first lens P1, a second lens G2, and a third lens G3;
the first lens P1 is a convex-concave lens having negative optical power; the second lens G2 is a convex-concave lens with negative focal power; the third lens G3 is a biconvex lens having positive optical power.
Further, the effective focal length of the first lens P1 is-12.93 < f1< -10.93; the effective focal length of the second lens G2 is-62.75 < f2< -60.75; the effective focal length of the third lens G3 is 12.3< f3< 14.3.
Further, both surfaces of the first lens P1 are aspherical surfaces, and a surface with a small radius of curvature among the two surfaces of the first lens P1 faces the aperture stop; both surfaces of the second lens G2 are spherical surfaces; both surfaces of the third lens G3 are spherical surfaces, and a surface with a small radius of curvature among the two surfaces of the third lens G3 faces the aperture stop.
Further, in the first group of lenses, the first lens P1 is a plastic lens, and the second lens G2 and the third lens G3 are glass lenses.
Further, the second group of lenses includes a fourth lens G4, a fifth lens G5, a sixth lens G6, and a seventh lens P7;
the fourth lens G4 is a concave-convex lens with positive focal power; the fifth lens G5 is a concave-convex lens having negative optical power; the sixth lens G6 is a meniscus lens having positive optical power; the seventh lens P7 is a biconvex lens having positive optical power.
Further, the effective focal length of the fourth lens G4 is 16.31< f4<18.31; the effective focal length of the fifth lens G5 is-15.83 < f5< -13.83; the effective focal length of the sixth lens G6 is 53.16< f6<55.16; the effective focal length of the seventh lens P7 is 14.18< f7<16.18.
Further, both surfaces of the fourth lens G4 are spherical; both surfaces of the fifth lens G5 are spherical; both surfaces of the sixth lens G6 are spherical surfaces, and both surfaces of the sixth lens G6 face the aperture stop; both surfaces of the seventh lens P7 are spherical, and a surface having a small radius of curvature among the two surfaces of the seventh lens P7 faces the aperture stop.
Further, in the second group of lenses, the fourth lens G4, the fifth lens G5 and the sixth lens G6 are all glass lenses, and the seventh lens P7 is a plastic lens.
Furthermore, a protective glass is arranged between the light splitting device and the image source surface.
It should be noted that, in an application example of the micro projection lens provided in the present application, specific parameters of each lens are shown in table 1:
table 1:
wherein the parameters include thickness, spacing, refractive index Nd (Refractive index), radius of curvature R (Radius of curvature), numerical aperture F/No., focal length F (Focus Length), and abbe coefficient Vd (Abbe number) for each lens.
Specifically:
the first lens P1 is a convex-concave lens with negative focal power made of plastic material (nd=1.531, vd= 56.04), wherein the concave surface faces the aperture direction of the diaphragm, and both surfaces are aspheric, and the effective focal length of the first lens P1 is-12.93 < f1< -10.93.
The second lens G2 is a convex-concave lens with negative focal power made of glass material (nd=1.487, vd= 70.420), and both surfaces are spherical, and the effective focal length of the second lens G2 is-62.75 < f2< -60.75.
The third lens G3 is a biconvex lens with positive optical power made of glass material (nd=1.846, vd= 23.787), the curved surface faces the aperture stop, both surfaces are spherical surfaces, and the effective focal length of the third lens G3 is 12.3< f3< 14.3.
The fourth lens G4 is a concave-convex lens with positive focal power made of glass material (nd=1.487, vd= 70.420), and both surfaces are spherical, and the effective focal length of the fourth lens G4 is 16.31< f4< 18.31.
The fifth lens G5 is a concave-convex lens with negative focal power made of glass material (nd=1.846, vd= 23.787), and both surfaces are spherical, and the effective focal length of the fifth lens G5 is-15.83 < f5< -13.83.
The sixth lens G6 is a meniscus lens with positive optical power made of glass material (nd=1.487, vd= 70.420), both surfaces face the aperture stop and are spherical, and the effective focal length of the sixth lens G6 is 53.16< f6< 55.16.
The seventh lens P7 is a biconvex lens with positive optical power made of glass material (nd=1.531, vd= 56.04), wherein the more curved surface faces the aperture stop, both surfaces are spherical, and the effective focal length of the seventh lens P7 is 14.18< f7<16.18.
The surfaces of the first lens P1 and the seventh lens P7 are aspheric surfaces, and the surfaces S1 and S2 of the aspheric convex-concave lens P1 and the surfaces S11 and S12 of the aspheric biconvex lens P7 can obtain corresponding curves of the spherical surfaces by an aspheric formula; the expression of the aspherical formula is as follows:
wherein: z represents the distance between the point on the aspheric surface and the vertex of the aspheric surface in the direction of the optical axis; 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 cone rate; a, a 4 、a 6 、a8、a 10 And represents the aspherical high order term coefficient.
The respective order coefficients of the aspherical convex-concave lens P1 and the aspherical biconvex lens P7 are shown in table two:
and (II) table:
the MTF (English name: modulation Transfer Function) index of the transfer function MTF value of each view field chip surface of the miniature projection lens provided by the embodiment of the application is the most accurate and scientific evaluation standard of the current lens. The ordinate is the contrast, the closer to 1, representing the more perfect the lens imaging. The abscissa represents resolution in units of pairs per millimeter line. The pixel size of the image source adopted by the application is 5.4um, and the corresponding design resolution is 93 line pairs per millimeter. Projection lenses typically require at least an MTF value of each field of view above 0.3 at the design resolution, whereas the MTF value of each field of view in the present application is substantially above 0.4.
Fig. 3 is a field curvature and distortion diagram of a miniature projection lens provided in an embodiment of the present application, where the left diagram in fig. 3 is a field curvature evaluation diagram, and the right diagram is a distortion evaluation diagram. The ordinate represents the field angle of the lens. The abscissa of the field curvature graph represents the magnitude of the field curvature value, and the abscissa of the distortion graph represents the distortion amount. Distortion is a very important index of projection lenses, and is generally required to be controlled within 3%, and the distortion amount in the application is within 1.2%.
Fig. 4 is a vertical axis color difference diagram of a lens, the ordinate is the image height field value size, and the abscissa is the numerical value size in micrometers. In the figure, the dominant wavelength is used as a reference, and the color difference value of each view field among blue light, red light and green light (dominant wavelength) is respectively drawn. The projection lens generally requires that the color difference value is within the pixel size of one image source, the vertical axis color difference is controlled within 2.2um and is smaller than 0.5 pixel size (namely 2.7 um), and the color difference control is very excellent.
Compared with the prior art:
1. the miniature projection lens has the advantages of compact structure, excellent imaging effect and large numerical aperture, and is beneficial to the improvement of brightness.
2. The first lens and the seventh lens of the miniature projection lens are plastic aspheric lenses, so that cost can be effectively reduced.
3. The application can be applied to various image source display schemes such as DMD, laser, LCOS, LCD and the like.
4. The application adopts a 7-lens structure, has a larger tolerance range, and can improve the mass production yield of the miniature projection lens.
The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of operation in sequences other than those illustrated or described herein, for example. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that in this application, "at least one" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
The above embodiments are merely for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (5)
1. A miniature projection lens, comprising:
the first group lens, the aperture diaphragm, the second group lens, the light splitting device and the image source surface are coaxially and sequentially arranged;
the first group of lenses is of positive focal length, and the focal length of the first group of lenses is 86.06< f8<384.06;
the second group lens is positive in focal length, and the focal length of the second group lens is 11.06< f9<13.06;
the first group of lenses includes a first lens, a second lens, and a third lens;
the first lens is a convex-concave lens with negative focal power; the second lens is a convex-concave lens with negative focal power; the third lens is a biconvex lens with positive focal power;
the effective focal length of the first lens is-12.93 < f1< -10.93; the effective focal length of the second lens is-62.75 < f2< -60.75; the effective focal length of the third lens is 12.3< f3<14.3;
the two surfaces of the first lens are aspheric, and the surface with small curvature radius of the two surfaces of the first lens faces the aperture diaphragm; both surfaces of the second lens are spherical surfaces; the two surfaces of the third lens are spherical, and the surface with the small curvature radius among the two surfaces of the third lens faces the aperture diaphragm;
the second group of lenses includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens;
the fourth lens is a concave-convex lens with positive focal power; the fifth lens is a concave-convex lens with negative focal power; the sixth lens is a meniscus lens with positive focal power; the seventh lens is a biconvex lens with positive focal power;
the effective focal length of the fourth lens is 16.31< f4<18.31; the effective focal length of the fifth lens is-15.83 < f5< -13.83; the effective focal length of the sixth lens is 53.16< f6<55.16; the effective focal length of the seventh lens is 14.18< f7<16.18.
2. The miniature projection lens of claim 1, wherein in said first group of lenses, said first optic is a plastic lens, and said second and third optic are glass lenses.
3. The miniature projection lens of claim 1, wherein both surfaces of said fourth optic are spherical; both surfaces of the fifth lens are spherical surfaces; both surfaces of the sixth lens are spherical surfaces, and both surfaces of the sixth lens face the aperture diaphragm; both surfaces of the seventh lens are spherical surfaces, and a surface with a small radius of curvature among the two surfaces of the seventh lens faces the aperture stop.
4. The miniature projection lens of claim 3, wherein in said second group of lenses, said fourth lens, said fifth lens and said sixth lens are all glass lenses and said seventh lens is a plastic lens.
5. The miniature projection lens of claim 1, wherein a cover glass is further disposed between the beam splitter and the image source surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910138777.7A CN109656002B (en) | 2019-02-25 | 2019-02-25 | Miniature projection lens |
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| CN201910138777.7A CN109656002B (en) | 2019-02-25 | 2019-02-25 | Miniature projection lens |
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| CN109656002B true CN109656002B (en) | 2024-04-16 |
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| CN110515188A (en) * | 2019-09-23 | 2019-11-29 | 深圳市点睛创视技术有限公司 | A kind of projection lens |
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| JP2007108531A (en) * | 2005-10-14 | 2007-04-26 | Ricoh Co Ltd | Zoom lens, camera, and personal digital assistant |
| CN101614864A (en) * | 2009-06-09 | 2009-12-30 | 宁波舜宇车载光学技术有限公司 | Super wide angle mega pixel vehicle-mounted lens |
| CN204807791U (en) * | 2015-06-17 | 2015-11-25 | 浙江大华技术股份有限公司 | Optical lens |
| CN208444071U (en) * | 2018-07-13 | 2019-01-29 | 协益电子（苏州）有限公司 | On-vehicle lens |
| CN109324395A (en) * | 2018-11-15 | 2019-02-12 | 江西特莱斯光学有限公司 | A kind of undistorted glass modeling camera lens of fixed-focus |
| CN209803444U (en) * | 2019-02-25 | 2019-12-17 | 深圳市点睛创视技术有限公司 | miniature projection lens |
-
2019
- 2019-02-25 CN CN201910138777.7A patent/CN109656002B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007108531A (en) * | 2005-10-14 | 2007-04-26 | Ricoh Co Ltd | Zoom lens, camera, and personal digital assistant |
| CN101614864A (en) * | 2009-06-09 | 2009-12-30 | 宁波舜宇车载光学技术有限公司 | Super wide angle mega pixel vehicle-mounted lens |
| CN204807791U (en) * | 2015-06-17 | 2015-11-25 | 浙江大华技术股份有限公司 | Optical lens |
| CN208444071U (en) * | 2018-07-13 | 2019-01-29 | 协益电子（苏州）有限公司 | On-vehicle lens |
| CN109324395A (en) * | 2018-11-15 | 2019-02-12 | 江西特莱斯光学有限公司 | A kind of undistorted glass modeling camera lens of fixed-focus |
| CN209803444U (en) * | 2019-02-25 | 2019-12-17 | 深圳市点睛创视技术有限公司 | miniature projection lens |
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