CN210690932U - 4K pixel level high-resolution projection zoom lens - Google Patents
4K pixel level high-resolution projection zoom lens Download PDFInfo
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- CN210690932U CN210690932U CN201921210815.7U CN201921210815U CN210690932U CN 210690932 U CN210690932 U CN 210690932U CN 201921210815 U CN201921210815 U CN 201921210815U CN 210690932 U CN210690932 U CN 210690932U
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Abstract
The utility model discloses a 4K pixel level high resolution projection zoom lens for projecting an image to a target projection surface, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a diaphragm and a fifth lens group which are coaxial and sequentially arranged along the direction from the image to the target projection surface; the first lens group, the fourth lens group and the fifth lens group are fixed groups, the second lens group and the third lens group are variable groups, and the second lens group and the third lens group move towards the direction of the first lens group when the small focal length of the projection zoom lens changes towards the large focal length. The utility model discloses a reasonable focal power distribution can eliminate the aberration better, reduces optical distortion, realizes higher optical performance requirement.
Description
Technical Field
The utility model relates to a projection zoom technical field, concretely relates to projection zoom of 4K pixel level high resolution power.
Background
As the requirement for the image quality of the cinema is higher, the 4K resolution projector plays an increasingly important role, and the projection zoom is an important component of the projector, which determines the image quality of the projection picture. The technical difficulties of the 4K projection zoom lens mainly include: the two factors determine the high imaging capability and the high design difficulty of the lens, namely the high Rach invariant and the diameter of an imaging surface; when the lens is used, high-power amplification imaging is carried out, aberration is also carried out along with the high-power amplification, particularly, the aberration, distortion, definition and illuminance uniformity are high, so that the aberration control requirement is very strict; the telecentric requirement of the lens and the addition of a prism structure between the lens and the spatial light modulator generally means that a longer optical back focus is required, which makes the design more difficult and the structure more complex; the number of lenses is large, and the zooming structure is complex, so that the requirement on the balance of aberrations is higher.
In summary, the design difficulty of the 4K pixel level projection zoom lens is high, the requirement is also high, and the defect that the off-axis aberration is obviously inferior to the on-axis aberration is generally existed. Typically, the off-axis imaging quality is 60% or less on-axis.
Therefore, there is a need in the art for a new projection zoom lens to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a projection zoom of 4K pixel level high-resolution power, its elimination aberration that can be better, off-axis aberration is close with the epaxial aberration, and the projection video development effect is better.
In order to achieve the above object, the present invention provides a 4K pixel level high resolution projection zoom lens for projecting an image onto a target projection surface, wherein the projection zoom lens comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a diaphragm and a fifth lens group, which are coaxial and sequentially arranged, along a direction from the image onto the target projection surface;
focal power phi of the first lens group1Satisfies the following conditions: -1.3 < phi1/φ*＜-0.2；
Focal power phi of the second lens group2Satisfies the following conditions: phi is more than 0.052/φ*＜0.3；
Focal power phi of the third lens group3Satisfies the following conditions: phi is more than 0.053/φ*＜0.3；
Focal power phi of the fourth lens group4Satisfies the following conditions: -0.5 < phi4/φ*＜-0.008；
Focal power phi of the fifth lens group5Satisfies the following conditions: phi is more than 0.15/φ*＜0.3；
φ*Projecting the focal power of the zoom lens in short focus;
the first lens group, the fourth lens group and the fifth lens group are fixed groups, the second lens group and the third lens group are variable groups, the projection zoom lens changes the process from a small focal length to a large focal length, and the second lens group and the third lens group move towards the first lens group.
Further, the first lens group comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power and a fourth lens with negative focal power which are arranged in sequence.
Furthermore, the second lens group comprises a fifth lens and a sixth lens which are sequentially arranged, wherein the fifth lens is a convex lens, and the sixth lens is a concave lens; the center distance between the fifth lens and the sixth lens is less than 1mm, or the fifth lens and the sixth lens are glued.
Further, the dispersion coefficient Vd5 of the fifth lens satisfies: vd5 > 55; the dispersion coefficient Vd6 of the sixth lens satisfies the following conditions: vd6 < 45.
Furthermore, the third lens group comprises a seventh lens and an eighth lens which are sequentially arranged, wherein the seventh lens is a concave lens, and the eighth lens is a convex lens; the center distance between the seventh lens and the eighth lens is less than 1mm, or the seventh lens and the eighth lens are glued.
Further, the dispersion coefficient Vd7 of the seventh lens satisfies: vd7 is less than 45; the dispersion coefficient Vd8 of the eighth lens satisfies the following conditions: vd8 > 55.
Further, the second lens group and the third lens group are arranged in a symmetrical structure.
Further, the fourth lens group includes a ninth lens, a tenth lens and a tenth lens arranged in sequence, and the ninth lens is a concave lens; the center distance between the tenth lens and the eleventh lens is less than 1mm, or the tenth lens and the eleventh lens are glued; wherein the dispersion coefficient Vd10 of the tenth lens satisfies the following condition: vd10 is more than 55, and the dispersion coefficient Vd11 of the eleventh lens meets the following requirements: vd11 < 45.
Further, a lens of the fifth lens group closest to the target projection surface is a biconvex lens or a convex-concave lens with a convex surface facing the first lens group.
Further, the zoom ratio of the projection zoom lens is greater than 1.2.
The utility model has the advantages that:
the utility model provides a 4K pixel level high resolution projection zoom lens, which comprises a first lens group, a second lens group, a third lens group, a diaphragm, a fourth lens group and a fifth lens group which are coaxial and arranged in sequence; focal power phi of the first lens group1Satisfies the following conditions: -1.3 < phi1/φ*< -0.2; focal power phi of the second lens group2Satisfies the following conditions: phi is more than 0.052/φ*Less than 0.3; focal power phi of the third lens group3Satisfies the following conditions: phi is more than 0.053/φ*Less than 0.3; focal power phi of the fourth lens group4Satisfies the following conditions: -0.5 < phi4/φ*< -0.008; focal power phi of the fifth lens group5Satisfies the following conditions: phi is more than 0.15/φ*＜0.3；φ*Projecting the focal power of the zoom lens in short focus; in the process of changing the small focal length to the large focal length, the first lens group is fixed, and the second lens group and the third lens group move towards the first lens group. Based on above-mentioned structure and focal power distribution of the utility model, can reach good aberration balance, make off-axis aberration and on-axis aberration be close.
Furthermore, the zooming and compensating set of the projection zoom lens is simpler, and the zooming and compensating process is easier to realize and more reliable. The second lens group and the third lens group are arranged in a symmetrical structure to eliminate coma aberration and distortion of the lens, and the fourth group and the fifth group are used as imaging groups to eliminate off-axis aberration and enable the off-axis aberration to be close to the on-axis aberration.
Drawings
Fig. 1 is a schematic diagram of a main structure of a projection zoom lens and a usage state thereof in a short focus according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an operating state of a middle focus corresponding to a projection zoom lens in an embodiment of the present invention;
fig. 3 is a schematic diagram of an operating state of a projection zoom lens corresponding to a telephoto in an embodiment of the present invention;
fig. 4 is a MTF graph corresponding to a projection zoom lens in a short focus according to an embodiment of the present invention;
fig. 5 is a distortion curve diagram corresponding to a projection zoom lens in a short focus according to an embodiment of the present invention;
fig. 6 is a MTF graph corresponding to the projection zoom lens in the middle focus according to the embodiment of the present invention;
fig. 7 is a distortion curve diagram corresponding to the projection zoom lens in the middle focus according to the embodiment of the present invention;
fig. 8 is a MTF graph corresponding to a projection zoom lens in the embodiment of the present invention;
fig. 9 is a distortion curve diagram corresponding to a projection zoom lens in the embodiment of the present invention;
fig. 10 is a graph of chromatic aberration corresponding to a projection zoom lens in short focus according to an embodiment of the present invention;
fig. 11 is a graph of chromatic aberration corresponding to a projection zoom lens in the middle focus according to an embodiment of the present invention;
fig. 12 is a graph of chromatic aberration corresponding to a projection zoom lens in a telephoto according to an embodiment of the present invention;
fig. 13 is a graph illustrating the illuminance uniformity of the projection zoom lens in the short focus according to the embodiment of the present invention;
fig. 14 is a graph illustrating the illuminance uniformity of the projection zoom lens in the middle focus according to the embodiment of the present invention;
fig. 15 is a graph illustrating illuminance uniformity of the projection zoom lens in the embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
Referring to fig. 1, fig. 1 illustrates a main structure of a 4K pixel level high-resolution projection zoom lens provided by this embodiment, and as shown in fig. 1, the 4K pixel level high-resolution projection zoom lens provided by this embodiment is used for projecting an image onto a target projection surface, and a zoom ratio of the projection zoom lens is greater than 1.2. The projection zoom lens comprises a first lens group 1, a second lens group 2, a third lens group 3, a fourth lens group 4, a diaphragm (not shown in the figure) and a fifth lens group 5 which are coaxially and sequentially arranged along the image-to-target projection surface; the first lens group 1, the fourth lens group 4 and the fifth lens group 5 are fixed groups, the second lens group 2 and the third lens group 3 are variable groups, and the second lens group 2 and the third lens group 3 move towards the first lens group 1 when the small focal length of the projection zoom lens changes towards the large focal length.
Wherein, the focal power phi of the first lens group1Satisfies the following conditions: -1.3 < phi1/φ*< -0.2; focal power phi of the second lens group2Satisfies the following conditions: phi is more than 0.052/φ*Less than 0.3; focal power phi of the third lens group3Satisfies the following conditions: phi is more than 0.053/φ*Less than 0.3; focal power phi of the fourth lens group4Satisfies the following conditions: -0.5 < phi4/φ*< -0.008; focal power phi of the fifth lens group5Satisfies the following conditions: phi is more than 0.15/φ*＜0.3；φ*For projecting the focal power of the zoom lens in short focus1，φ2，φ3，φ4，φ5The focal powers of the five lens groups are respectively.
Based on the distribution scheme of the power distribution, the lens groups are distributed in balance and have small numerical values, so that the aberration value is smaller, and the tolerance is not too large, thereby being beneficial to the adjustment of the lens. The diaphragm is located between the fourth lens group and the fifth lens group, so that the size of the lens is more reasonable, no halo needs to be added, the illumination uniformity of the lens can be better, and the illumination uniformity is close to 100%.
The first lens group 1 includes a first lens 11 having a negative refractive power, a second lens 12 having a negative refractive power, a third lens 13 having a positive refractive power, and a fourth lens 14 having a negative refractive power, which are arranged in sequence, and specifically, the first lens 11 may be a convex-concave lens, the second lens 12 may be a biconcave lens, the third lens 13 may be a biconvex lens, and the fourth lens 14 may be a biconcave lens. The first lens group 1 adopts the combination of negative, positive and negative focal power lenses to better reflect the light to the variable group.
The second lens group 2 is composed of a fifth lens 25 and a sixth lens 26 which are arranged in sequence, the fifth lens 25 is a convex lens, the sixth lens 26 is a concave lens, and the center distance between the fifth lens 25 and the sixth lens 26 is less than 1mm, or the fifth lens 25 and the sixth lens 26 are glued, i.e. connected through a gluing process. The dispersion coefficient Vd5 of the fifth lens 25 satisfies: vd5 is more than 55, and the dispersion coefficient Vd6 of the sixth lens 26 satisfies the following conditions: vd6 < 45. The chromatic aberration can be eliminated better by utilizing the matching combination of the fifth lens 25 and the sixth lens 26, and when the chromatic aberration is eliminated, the curvature radius of the lenses is larger, the tolerance is looser, and therefore, the processing is easier.
The third lens group 3 comprises a seventh lens 37 and an eighth lens 38 arranged in sequence, the seventh lens 37 is a concave lens, the eighth lens 38 is a convex lens, the center distance between the seventh lens 37 and the eighth lens 38 is less than 1mm, or the seventh lens 37 and the eighth lens 38 are glued, i.e. connected through a gluing process. The dispersion coefficient Vd7 of the seventh lens 37 satisfies: vd7 is less than 45; the dispersion coefficient Vd8 of the eighth lens 38 satisfies: vd8 > 55. The chromatic aberration can be eliminated better by the matching combination of the seventh lens 37 and the eighth lens 38, and when the chromatic aberration is eliminated, the curvature radius of the lenses is larger, the tolerance is looser, and therefore the processing is easier.
Further, second lens group 2 and third lens group 3 can set up to symmetrical structure to eliminate the coma of camera lens and distortion better, realize that off-axis definition is close epaxially, off-axis distortion is also littleer.
The fourth lens group 4 includes a ninth lens 49, a tenth lens 410 and an eleventh lens 411 arranged in sequence; the ninth lens 49 is a concave lens, the center distance between the tenth lens 410 and the eleventh lens 411 is less than 1mm, or the tenth lens 410 and the eleventh lens 411 are glued, i.e. connected by a gluing process. Wherein, the abbe number Vd10 of the tenth lens 410 satisfies: vd10 is more than 55, and the dispersion coefficient Vd11 of the eleventh lens 411 satisfies the following conditions: vd11 < 45. When the chromatic aberration is eliminated by the matching combination of the tenth lens 410 and the eleventh lens 411, the curvature radius of the lenses is larger, the tolerance is looser, and the processing is easier.
The fifth lens group 5 is composed of 10 lens elements, wherein the lens element closest to the target projection surface (i.e., the last lens element) is a biconvex lens or a convex-concave lens with a convex surface facing the first lens group, so that the light can be smoothly refracted onto the target projection surface. In this embodiment, each of the fourth and fifth lens groups at least includes a cemented lens or a dual-separated lens with a center distance smaller than 1mm, and the structure can make the image formed by the first three lens groups appear on the target projection plane with higher quality.
The 4K pixel level high-resolution projection zoom lens of the present embodiment adopts 21 lenses, has a high resolution of 4K pixels, can better phase aberration, and realizes an optical distortion of less than 2%.
Referring to table 1, table 1 exemplarily shows specific parameters of each lens in the projection zoom lens.
TABLE 1
Referring to fig. 1 to fig. 3, the projection zoom lens according to an embodiment of the present invention is exemplarily shown in a short focus, a middle focus, and a long focus. Fig. 4, fig. 6, fig. 8 are the exemplary views respectively showing the projection zoom lens of the embodiment of the present invention, the MTF curve graph when the short focus, the middle focus, and the long focus, the MTF curve graph can reflect the resolution level of one of these lenses, and it can be seen that the embodiment of the present invention has higher resolution, and is suitable for the projection display of 4K high definition image. Fig. 5, fig. 7, fig. 9 respectively illustrate the projection zoom lens according to an embodiment of the present invention, and the distortion curve graph when the focus is short, middle, and long, it can be seen that the present invention provides a projection zoom lens with distortion rate of about 2%, and optical distortion is lower. Fig. 10 to 12 are graphs illustrating chromatic aberration curves of the projection zoom lens according to the embodiment of the present invention in short focus, middle focus, and long focus, respectively. Fig. 13 to 15 are diagrams illustrating illumination uniformity curves of the projection zoom lens according to the embodiment of the present invention in short focus, middle focus, and long focus, respectively. It can be seen that the utility model discloses projection zoom lens structural design is reasonable, has higher optical performance requirement.
The above description is the preferred embodiment of the present invention and the technical principle applied by the same, and for those skilled in the art, without departing from the spirit and scope of the present invention, any obvious changes such as equivalent transformation, simple replacement, etc. based on the technical solution of the present invention all belong to the protection scope of the present invention.
Claims (10)
1. A4K pixel level high-resolution projection zoom lens is used for projecting an image to a target projection surface and is characterized in that the projection zoom lens comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a diaphragm and a fifth lens group which are coaxial and sequentially arranged along the direction from the image to the target projection surface;
the above-mentionedFocal power phi of the first lens group1Satisfies the following conditions: -1.3 < phi1/φ*＜-0.2；
Focal power phi of the second lens group2Satisfies the following conditions: phi is more than 0.052/φ*＜0.3；
Focal power phi of the third lens group3Satisfies the following conditions: phi is more than 0.053/φ*＜0.3；
Focal power phi of the fourth lens group4Satisfies the following conditions: -0.5 < phi4/φ*＜-0.008；
Focal power phi of the fifth lens group5Satisfies the following conditions: phi is more than 0.15/φ*＜0.3；
φ*Projecting the focal power of the zoom lens in short focus;
the first lens group, the fourth lens group and the fifth lens group are fixed groups, the second lens group and the third lens group are variable groups, the projection zoom lens changes the process from a small focal length to a large focal length, and the second lens group and the third lens group move towards the first lens group.
2. The 4K pixel level high resolution projection zoom lens of claim 1, wherein said first lens group comprises a first lens having a negative power, a second lens having a negative power, a third lens having a positive power and a fourth lens having a negative power, which are arranged in sequence.
3. The 4K pixel level high resolution projection zoom lens of claim 1, wherein said second lens group comprises a fifth lens element and a sixth lens element arranged in series, said fifth lens element being a convex lens element and said sixth lens element being a concave lens element;
the center distance between the fifth lens and the sixth lens is less than 1mm, or the fifth lens and the sixth lens are glued.
4. The 4K pixel level high resolution projection zoom lens according to claim 3,
the dispersion coefficient Vd5 of the fifth lens satisfies the following conditions: vd5 > 55;
the dispersion coefficient Vd6 of the sixth lens satisfies the following conditions: vd6 < 45.
5. The 4K pixel level high resolution projection zoom lens of claim 1, wherein said third lens group comprises a seventh lens element and an eighth lens element arranged in series, said seventh lens element being a concave lens element and said eighth lens element being a convex lens element;
the center distance between the seventh lens and the eighth lens is less than 1mm, or the seventh lens and the eighth lens are glued.
6. The 4K pixel-level high-resolution projection zoom lens according to claim 5,
the dispersion coefficient Vd7 of the seventh lens satisfies the following conditions: vd7 is less than 45;
the dispersion coefficient Vd8 of the eighth lens satisfies the following conditions: vd8 > 55.
7. The 4K pixel high resolution projection zoom lens of claim 1, wherein said second and third lens groups are arranged in a symmetrical configuration.
8. The 4K pixel level high resolution projection zoom lens of claim 1, wherein said fourth lens group comprises a ninth lens, a tenth lens and an eleventh lens, which are arranged in sequence, said ninth lens being a concave lens;
the center distance between the tenth lens and the eleventh lens is less than 1mm, or the tenth lens and the eleventh lens are glued;
wherein the dispersion coefficient Vd10 of the tenth lens satisfies the following condition: vd10 is more than 55, and the dispersion coefficient Vd11 of the eleventh lens meets the following requirements: vd11 < 45.
9. The 4K pixel level high resolution projection zoom lens of claim 1, wherein the lens element of said fifth lens group closest to said target projection surface is a biconvex lens or a convex-concave lens with a convex surface facing said first lens group.
10. The 4K pixel level high-resolution projection zoom lens according to any one of claims 1 to 9, wherein a magnification ratio of the projection zoom lens is larger than 1.2.
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| CN201921210815.7U CN210690932U (en) | 2019-07-30 | 2019-07-30 | 4K pixel level high-resolution projection zoom lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441895A (en) * | 2019-07-30 | 2019-11-12 | 中影巴可（北京）电子有限公司 | The projecting zoom lens of 4K Pixel-level high resolution |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441895A (en) * | 2019-07-30 | 2019-11-12 | 中影巴可（北京）电子有限公司 | The projecting zoom lens of 4K Pixel-level high resolution |
| CN110441895B (en) * | 2019-07-30 | 2024-05-03 | 中影巴可（北京）电子有限公司 | Projection zoom lens with 4K pixel-level high resolution |
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