CN209803444U - miniature projection lens - Google Patents
miniature projection lens Download PDFInfo
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- CN209803444U CN209803444U CN201920235249.9U CN201920235249U CN209803444U CN 209803444 U CN209803444 U CN 209803444U CN 201920235249 U CN201920235249 U CN 201920235249U CN 209803444 U CN209803444 U CN 209803444U
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Abstract
the embodiment of the application provides a miniature projection lens, includes: the first group of lenses, the diaphragm, the second group of lenses, the light splitting device and the image source surface are coaxially and sequentially arranged; the first group of lenses has a positive focal length, the first group of lenses has a focal length of 84.06< f8< 86.06; the second group of lenses has a positive focal length, the focal length of the second group of lenses 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 application relates to the technical field of projection lenses, in particular to a miniature projection lens.
Background
With the development of scientific technology, technologies serving consumers are emerging, especially in the field of electronic products. As the application of projection devices to increasingly rich and wide scenes, how to design a projection lens with small size, good imaging quality, high brightness and low cost is a matter of thought for those skilled in the art.
The focal length of miniature projection lens all is more than 2 in the existing market, rarely accomplish the focal length and be less than 1.6, because numerical aperture is littleer, imaging quality satisfies more easily, nevertheless because numerical aperture is littleer, miniature projection lens's luminance also reduces thereupon, consequently, how when improving numerical aperture, guarantees imaging quality and is the technical problem that this application needs to solve.
Disclosure of Invention
the application provides a miniature projection lens for when improving numerical aperture, guaranteed imaging quality.
In view of the above, a first aspect of the present application provides a micro projection lens, including:
The first group of lenses, the aperture diaphragm, the second group of lenses, the light splitting device and the image source surface are coaxially and sequentially arranged;
The first group of lenses has a positive focal length, the first group of lenses has a focal length of 84.06< f8< 86.06;
The second group of lenses has a positive focal length, the focal length of the second group of lenses is 11.06< f9< 13.06.
Optionally, the first group of lenses comprises a first optic, a second optic, and a third optic;
The first lens is a concave-convex lens with negative focal power; the second lens is a concave-convex lens with negative focal power; the third lens is a biconvex lens with positive focal power.
Optionally, the first lens has an effective focal length of-12.93 < f1< -10.93; the effective focal length of the second lens is-62.75 < f2< -60.75; the third lens has an effective focal length of 12.3< f3< 14.3.
Optionally, both surfaces of the first lens are aspheric, and a surface with a small curvature radius of the two surfaces of the first lens faces the aperture stop; both surfaces of the second lens are spherical surfaces; and the two surfaces of the third lens are both spherical surfaces, and the surface with the small curvature radius in 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 comprises a fourth optic, a fifth optic, a sixth optic, and a seventh optic;
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 sixth lens has an effective focal length of 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; two surfaces of the sixth lens are spherical surfaces, and two surfaces of the sixth lens face the aperture diaphragm; the two surfaces of the seventh lens are both spherical surfaces, and the surface with the small curvature radius in 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.
According to the technical scheme, the embodiment of the application has the following advantages:
In an embodiment of the present application, a micro projection lens is provided, including: the first group of lenses, the diaphragm, the second group of lenses, the light splitting device and the image source surface are coaxially and sequentially arranged; the first group of lenses has a positive focal length, the first group of lenses has a focal length of 84.06< f8< 86.06; the second group of lenses has a positive focal length, the focal length of the second group of lenses 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 structural diagram of a micro projection lens according to an embodiment of the present disclosure;
Fig. 2 is a graph of MTF of chip surface transfer functions of each field of view of a micro projection lens according to an embodiment of the present disclosure;
FIG. 3 is a diagram illustrating curvature of field and distortion of a micro projection lens according to an embodiment of the present disclosure;
fig. 4 is a vertical axis chromatic aberration diagram of a micro projection lens according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application designs a miniature projection lens for when improving numerical aperture, guaranteed imaging quality.
For easy understanding, please refer to fig. 1, in which fig. 1 is an optical structure diagram of a micro projection lens in an embodiment of the present application, and as shown in fig. 1, the optical structure diagram specifically includes:
The first group of lenses, the aperture diaphragm, the second group of lenses, the light splitting device and the image source surface are coaxially and sequentially arranged;
The first group lens has a positive focal length, and the focal length of the first group lens is 84.06< f8< 86.06;
the second group of lenses has a positive focal length, and the focal length of the second group of lenses 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 micro projection lens is provided, including: the first group of lenses, the diaphragm, the second group of lenses, the light splitting device and the image source surface are coaxially and sequentially arranged; the first group of lenses has a positive focal length, the first group of lenses has a focal length of 84.06< f8< 86.06; the second group of lenses has a positive focal length, the focal length of the second group of lenses 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 concave-convex lens with negative focal power; the second lens G2 is a concave-convex lens with negative focal power; the third lens G3 is a biconvex lens with positive 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 mirror P1 are aspheric, and the surface with a small radius of curvature of the two surfaces of the first mirror P1 faces the aperture stop; both surfaces of the second lens G2 are spherical; both surfaces of the third mirror G3 are spherical, and the surface with the small radius of curvature of the two surfaces of the third mirror 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 optic G4, a fifth optic G5, a sixth optic G6, and a seventh optic P7;
the fourth lens G4 is a concave-convex lens with positive focal power; the fifth lens G5 is a concave-convex lens with negative focal power; the sixth lens G6 is a meniscus lens with positive power; the seventh lens P7 is a biconvex lens with positive 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, and both surfaces of the sixth lens G6 face the aperture stop; both surfaces of the seventh mirror P7 are spherical, and the surface having a small radius of curvature of the both surfaces of the seventh mirror P7 faces the aperture stop.
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.
in an application example of the micro projection lens provided by the present application, specific parameters of each lens are shown in table 1:
Table 1:
The parameters include the thickness and spacing of each lens, the refractive index Nd (refractive index) of each lens, the radius of curvature R (radius of curvature), the numerical aperture F/NO, the focal length F (focus length), and the Abbe number Vd (Abbe number) of each lens.
Specifically, the method comprises the following steps:
The first lens P1 is a concave-convex lens made of plastic material (nd 1.531, vd 56.04), wherein the concave surface faces the aperture direction of the stop, 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 power made of glass material (nd is 1.487, vd is 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 power made of glass material (nd is 1.846, vd is 23.787), the more curved surface faces the aperture stop, both surfaces are spherical, 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 made of a glass material (nd is 1.487, vd is 70.420) and has a positive optical power, 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 power made of glass material (nd is 1.846, vd is 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 made of glass material (nd 1.487, vd 70.420) and has positive power, 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 made of glass material (nd 1.531, vd 56.04) with positive power, in which the more curved surface faces the aperture stop and 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 piece P1 and the seventh lens piece 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 a curve corresponding to a spherical surface by an aspheric formula; the expression of the aspherical formula is as follows:
wherein: z represents a distance in the optical axis direction of a point on the aspherical surface from the aspherical surface vertex; r represents the distance of a point on the aspheric surface from the optical axis; c represents the center curvature of the aspherical surface; k represents the conicity; a is4、a6、 a8、a10Representing aspheric high order term coefficients.
the respective order coefficients of the aspherical convex-concave lens P1 and the aspherical biconvex lens P7 are shown in table two:
Table two:
the MTF (Modulation Transfer Function) index, which is the most accurate and scientific evaluation standard of the current lens, is the MTF value of each field-of-view chip surface Transfer Function of the micro projection lens provided in the embodiment of the application. The ordinate is the contrast, the closer to 1, the more perfect the lens imaging is represented. The abscissa represents the resolution in units of log per millimeter. The size of the image source pixel adopted by the application is 5.4um, and the corresponding design resolution is 93 line pairs per millimeter. The projection lens generally requires that the MTF value of each field of view at least reaches above 0.3 at the design resolution, and the MTF value of each field of view of the present application is substantially above 0.4.
Fig. 3 is a field curvature and distortion diagram of a micro projection lens provided in an embodiment of the present application, where a left diagram in fig. 3 is a field curvature evaluation diagram, and a right diagram is a distortion evaluation diagram. The ordinate represents the angle of the field of view of the lens. The abscissa of the curvature of field graph represents the magnitude of the curvature of field value, and the abscissa of the distortion graph represents the amount of distortion. Distortion is a very important index of a projection lens, and generally needs to be controlled within 3%, and the distortion amount of the application is within 1.2%.
fig. 4 is a vertical axis chromatic aberration diagram of the lens, the ordinate is the size of the image height field of view value, and the abscissa is the size of the numerical value in unit micrometer. The difference in color for each field of view between blue, red and green light (dominant wavelength) is plotted separately, based on the dominant wavelength. The projection lens generally requires that the color difference value is within the size of one image source pixel, the vertical axis chromatic aberration of the invention is controlled within 2.2um and less than 0.5 pixel (namely: 2.7um), and the chromatic aberration 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 improving the 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 method and the device can be applied to various image source display schemes such as DMD, laser, LCOS, LCD and the like.
4. this application adopts 7 lens structures, has great tolerance ranges, can improve miniature projection lens's volume production yield.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. 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 the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. 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 only used for illustrating the technical solutions 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A miniature projection lens, comprising:
The first group of lenses, the aperture diaphragm, the second group of lenses, the light splitting device and the image source surface are coaxially and sequentially arranged;
The first group of lenses has a positive focal length, the first group of lenses has a focal length of 84.06< f8< 86.06;
The second group of lenses has a positive focal length, the focal length of the second group of lenses is 11.06< f9< 13.06.
2. The micro projection lens of claim 1,
The first group of lenses comprises a first optic, a second optic, and a third optic;
The first lens is a concave-convex lens with negative focal power; the second lens is a concave-convex lens with negative focal power; the third lens is a biconvex lens with positive focal power.
3. The micro projection lens of claim 2 wherein the first lens has an effective focal length of-12.93 < f1< -10.93; the effective focal length of the second lens is-62.75 < f2< -60.75; the third lens has an effective focal length of 12.3< f3< 14.3.
4. the micro projection lens of claim 3,
The two surfaces of the first lens are both aspheric surfaces, and the surface with the small curvature radius in the two surfaces of the first lens faces the aperture diaphragm; both surfaces of the second lens are spherical surfaces; and the two surfaces of the third lens are both spherical surfaces, and the surface with the small curvature radius in the two surfaces of the third lens faces the aperture diaphragm.
5. The micro projection lens as claimed in claim 4, wherein the first lens of the first group of lenses is a plastic lens, and the second lens and the third lens are glass lenses.
6. The micro projection lens of claim 1,
The second group of lenses comprises a fourth optic, a fifth optic, a sixth optic, and a seventh optic;
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.
7. The micro projection lens of claim 6 wherein 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 sixth lens has an effective focal length of 53.16< f6< 55.16; the effective focal length of the seventh lens is 14.18< f7< 16.18.
8. The micro projection lens of claim 7, wherein both surfaces of the fourth lens are spherical; both surfaces of the fifth lens are spherical surfaces; two surfaces of the sixth lens are spherical surfaces, and two surfaces of the sixth lens face the aperture diaphragm; the two surfaces of the seventh lens are both spherical surfaces, and the surface with the small curvature radius in the two surfaces of the seventh lens faces the aperture stop.
9. the micro projection lens as claimed in claim 8, wherein the fourth lens, the fifth lens and the sixth lens of the second group of lenses are all glass lenses, and the seventh lens is a plastic lens.
10. the micro projection lens according to claim 1, wherein a protective glass is further disposed between the beam splitter and the image source surface.
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| CN201920235249.9U CN209803444U (en) | 2019-02-25 | 2019-02-25 | miniature projection lens |
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| CN201920235249.9U CN209803444U (en) | 2019-02-25 | 2019-02-25 | miniature projection lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109656002A (en) * | 2019-02-25 | 2019-04-19 | 深圳市点睛创视技术有限公司 | A kind of Miniature projection lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109656002A (en) * | 2019-02-25 | 2019-04-19 | 深圳市点睛创视技术有限公司 | A kind of Miniature projection lens |
| CN109656002B (en) * | 2019-02-25 | 2024-04-16 | 深圳市点睛创视技术有限公司 | Miniature projection lens |
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