CN109270669B - Telecentric lens system - Google Patents
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- CN109270669B CN109270669B CN201710580031.2A CN201710580031A CN109270669B CN 109270669 B CN109270669 B CN 109270669B CN 201710580031 A CN201710580031 A CN 201710580031A CN 109270669 B CN109270669 B CN 109270669B
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- 239000011521 glass Substances 0.000 claims abstract description 27
- 230000003287 optical effect Effects 0.000 claims description 14
- 239000006185 dispersion Substances 0.000 claims description 12
- 230000005499 meniscus Effects 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 abstract description 24
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 21
- 230000004075 alteration Effects 0.000 description 11
- 210000001747 pupil Anatomy 0.000 description 6
- 239000006059 cover glass Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000003706 image smoothing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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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
- G02B13/22—Telecentric objectives or lens systems
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
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Abstract
一种远心镜头系统，其最大像高设定为Max IMH，并由投影侧至影像源侧依序包含：一第一透镜、第二透镜、第三透镜、第四透镜、光圈、第五透镜、第六透镜、第七透镜、第八透镜及第九透镜，该第一透镜与第二透镜皆为负透镜，又第一透镜或第二透镜为玻璃非球面透镜，该玻璃非球面透镜的有效半径设定为SD，并符合下列条件：1.3＜SD/Max IMH＜2.4。本发明借由玻璃非球面透镜的有效半径与最大像高的匹配，在一定匹配范围内，亦可衡平投影成像质量与制造成本、体积之间，配合以玻璃非球面透镜取代原本镜头常用的塑料非球面透镜，亦提升投影成像质量的可靠度，因此，适用于高亮度投影机。
A telecentric lens system, whose maximum image height is set to Max IMH, and includes, from the projection side to the image source side, a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens, wherein both the first lens and the second lens are negative lenses, and the first lens or the second lens is a glass aspheric lens, wherein the effective radius of the glass aspheric lens is set to SD and meets the following conditions: 1.3＜SD/Max IMH＜2.4. The present invention can balance the projection imaging quality with the manufacturing cost and volume within a certain matching range by matching the effective radius of the glass aspheric lens with the maximum image height, and by replacing the plastic aspheric lens commonly used in the original lens with the glass aspheric lens, the reliability of the projection imaging quality is also improved, and therefore, the present invention is suitable for high-brightness projectors.
Description
Technical Field
The invention relates to a telecentric lens system, in particular to a telecentric lens system which can balance the projection imaging quality with the manufacturing cost and volume by matching the effective radius with the maximum image height within a certain matching range, and can improve the reliability of the projection imaging quality by matching a glass aspheric lens instead of a plastic aspheric lens.
Background
As optical technology advances, projectors are used not only in offices for bulletins, but also in homes for viewing videos and programs, so that manufacturers are also developing and developing the reduction of the size of the lens of the projector for the convenience of using and carrying the projectors, and the reduction of the size of the lens can reduce the disadvantage of the high manufacturing cost, and further the reduction of the size of the lens of the projector makes the projector light, and also satisfies the requirement of consumers for miniaturization of the projector, and at the same time, the reduction of the manufacturing cost of the manufacturers is satisfied, but the projection imaging quality is affected.
Secondly, the projector is developed toward high brightness, and relatively, the temperature generated during operation is high, and the plastic aspheric lens commonly used in the original lens also causes the risk of reliability of the projection imaging quality. However, it is also an objective of the present invention to find that the projection imaging quality, the manufacturing cost, and the volume of the lens of the projector depend on the optical design of the plurality of lens structures, and how to balance the projection imaging quality, the manufacturing cost, and the volume of the lens of the projector with the optical design of the plurality of lens structures, and to improve the reliability of the projection imaging quality.
Disclosure of Invention
The main technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and to provide a telecentric lens system, which can balance the efficiency between the projection imaging quality and the manufacturing cost and volume within a certain matching range by the technical characteristics of effective radius and maximum image height matching; the glass aspheric lens replaces the plastic aspheric lens, and the reliability of the projection imaging quality is also improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a telecentric lens system with a maximum image height set to Max IMH, comprising, in order from the projection side to the image source side: a first lens element, a second lens element, a third lens element, a fourth lens element, an aperture stop, a fifth lens element, a sixth lens element, a seventh lens element, an eighth lens element and a ninth lens element, wherein the first lens element and the second lens element are both negative lens elements, and the first lens element or the second lens element is a glass aspheric lens element, and the effective radius of the glass aspheric lens element is set to be SD, and the following conditions are satisfied: SD/MaxIMH is more than 1.3 and less than 2.4.
According to the aforementioned characteristics, the focal ratio of the aperture is set to 1.7 to 2.1.
According to the features of the present disclosure, the fifth lens element, the sixth lens element, the seventh lens element, the eighth lens element and the ninth lens element form a cemented lens element by the fifth lens element, the sixth lens element and the seventh lens element, and the fifth lens element, the sixth lens element, the seventh lens element, the eighth lens element and the ninth lens element at least include a glass aspheric lens element and two high dispersion lens elements, and the abbe number of the high dispersion lens element is Vd, wherein Vd is less than 30.
According to the disclosed features, the first and second lenses are configured as a focus group; the third lens is set as a fixed group; the fourth lens element is configured as a first zoom group; the diaphragm, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are set to be a second zooming group, and the first zooming group and the second zooming group are linked to zoom and move the focusing group to focus.
According to the characteristics of the previous disclosure, the third lens is a concave-convex lens, and the convex surface of the third lens faces the projection side; the fourth lens is a concave-convex lens, and the convex surface of the fourth lens faces the projection side; the fifth lens is a concave-convex lens, and the concave surface of the fifth lens faces the projection side; the sixth lens is a biconcave lens; the seventh lens is a biconvex lens; the eighth lens is a biconvex lens; the ninth lens is a plano-convex lens with its flat surface facing the projection side.
According to the characteristics of the previous disclosure, the third lens is a concave-convex lens, and the concave surface of the third lens faces the projection side; the fourth lens is a concave-convex lens, and the convex surface of the fourth lens faces the projection side; the fifth lens is a biconvex lens; the sixth lens is a biconcave lens; the seventh lens is a biconvex lens; the eighth lens is a biconvex lens; the ninth lens is a biconvex lens.
According to the aforementioned feature, the negative lens of the second lens is a biconcave lens; the third lens is a biconvex lens, and forms a compound lens with the second lens; the fourth lens is a concave-convex lens, and the convex surface of the fourth lens faces the projection side; the fifth lens is a concave-convex lens, and the concave surface of the fifth lens faces the projection side; the sixth lens is a biconcave lens; the seventh lens is a biconvex lens; the eighth lens is a biconvex lens; the ninth lens is a biconvex lens.
According to the aforementioned features, the optical element is disposed behind the ninth lens element.
According to the aforementioned characteristics, the image forming apparatus further includes a transmissive smoothing device disposed between the optical element and the ninth lens.
By means of the technical means disclosed above, the invention can balance the quality of projection imaging with the manufacturing cost and volume by the technical characteristics of matching of the effective radius and the maximum image height in a certain matching range, and can improve the reliability of the projection imaging quality by matching the glass aspheric lens instead of the plastic aspheric lens, thereby being suitable for a high-brightness projector.
The invention has the advantages that the invention can balance the effects of projection imaging quality, manufacturing cost and volume within a certain matching range by the technical characteristics of effective radius and maximum image height matching; the glass aspheric lens replaces the plastic aspheric lens, and the reliability of the projection imaging quality is also improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1A is a schematic view of a lens arrangement according to a first embodiment of the present invention.
FIG. 1B is a schematic diagram of the imaged radius and the maximum image height according to the first embodiment of the present invention.
Fig. 1C is a schematic diagram of an optical path according to the first embodiment of the present invention.
FIG. 1D is a focusing and zooming diagram of the first embodiment of the present invention.
FIG. 1E is a transverse ray fan diagram of the first embodiment of the present invention.
Fig. 1F is a graph of field curvature and distortion for the first embodiment of the present invention.
Fig. 1G is a lateral chromatic aberration diagram of the first embodiment of the present invention.
FIG. 1H is a longitudinal aberration diagram of the first embodiment of the present invention.
Fig. 2A is a schematic view of a lens configuration according to a second embodiment of the present invention.
FIG. 2B is a diagram illustrating the imaged radius and the maximum image height according to a second embodiment of the present invention.
Fig. 2C is a schematic diagram of an optical path according to a second embodiment of the present invention.
FIG. 2D is a transverse ray fan diagram of a second embodiment of the present invention.
Fig. 2E is a graph of field curvature and distortion for a second embodiment of the present invention.
Fig. 2F is a lateral chromatic aberration diagram of a second embodiment of the present invention.
FIG. 2G is a longitudinal aberration diagram of the second embodiment of the present invention.
FIG. 3A is a schematic view of a lens arrangement according to a third embodiment of the present invention.
FIG. 3B is a diagram of the imaged radius and the maximum image height according to the third embodiment of the present invention.
Fig. 3C is a schematic diagram of an optical path according to a third embodiment of the present invention.
FIG. 3D is a transverse ray fan diagram of a third embodiment of the present invention.
Fig. 3E is a graph of field curvature and distortion for a third embodiment of the present invention.
Fig. 3F is a lateral chromatic aberration diagram of a third embodiment of the present invention.
FIG. 3G is a longitudinal aberration diagram of the third embodiment of the present invention.
The reference numbers in the figures illustrate:
10A, 10B, 10C telecentric lens system
11 first lens
12 second lens
13 third lens
14 fourth lens
15 fifth lens
16 sixth lens
17 seventh lens
18 eighth lens
19 ninth lens
20 aperture
30 optical element
Effective radius of SD
Max IMH maximum image height
TSP penetration type image smoothing device
CG glass cover plate
IMA imaging surface
FS focus group
FX fixed group
Z1First zoom group
Z2Second zoom group
D1First distance of movement
D2Second distance of movement
D3Third distance of movement
D4A fourth movement distance
Detailed Description
First, referring to fig. 1A to fig. 3G, the telecentric lens system according to the present invention has a maximum image height set as Max IMH, which is in mm, and sequentially includes: a first lens element 11, a second lens element 12, a third lens element 13, a fourth lens element 14, an aperture stop 20, a fifth lens element 15, a sixth lens element 16, a seventh lens element 17, an eighth lens element 18, and a ninth lens element 19, wherein the first lens element 11 and the second lens element 12 are both negative lens elements, and the first lens element 11 or the second lens element 12 is a glass aspheric lens element, and the effective radius of the glass aspheric lens element is set to be SD, and the unit is mm, and the following conditions are satisfied: 1.3< SD/Max IMH <2.4, and also maintains good projection imaging quality.
In this embodiment, the focal ratio (F/#) of the aperture 20 is set to 1.7-2.1; the fifth lens element 15, the sixth lens element 16, the seventh lens element 17, the eighth lens element 18, and the ninth lens element 19 form a cemented lens with the fifth lens element 15, the sixth lens element 16, and the seventh lens element 17, and the fifth lens element 15, the sixth lens element 16, the seventh lens element 17, the eighth lens element 18, and the ninth lens element 19 at least include a glass aspheric lens and two high dispersion lens elements, and the abbe number of the high dispersion lens element is Vd, wherein Vd is less than 30, but not limited thereto. In addition, an optical element 30 is disposed behind the ninth lens element 19, in this embodiment, the optical element 30 may be a prism, and a Cover Glass (CG) and an image plane (IMA) of a Digital Micromirror Device (DMD) are sequentially disposed behind the prism.
In table one, table four and table six, L1R1 and L1R2 listed in Lens (Lens) are the projection side surface and the image source side surface of the first Lens 11, respectively; L2R1 and L2R2 are the projection side surface and the image source side surface of the second lens 12, respectively; L3R1 and L3R2 are the projection side surface and the image source side surface of the third lens 13, respectively; L4R1 and L4R2 are the projection side surface and the image source side surface of the fourth lens 14, respectively; aprestare is aperture 20; L5R1 is the projection side surface of the fifth lens 15; L6R1 is the projection side surface of the sixth lens 16; L7R1 and L7R2 are respectively the projection side surface and the image source side surface of the seventh lens 17; L8R1 and L8R2 are the projection side surface and the image source side surface of the eighth lens element 18, respectively; L9R1 and L9R2 are the projection side surface and the image source side surface of the ninth lens 19, respectively, and list the parameters of the Radius (Radius), Thickness (Thickness), abbe number (Vd) and refractive index (Nd) of the projection side surface and the image source side surface of each lens, and in cooperation with table two, table five and table seven, list L2R1 and list L2R2 in the glass aspheric lens (ASPH) are the projection side surface and the image source side surface of the second lens 12, respectively; L5R1 and L5R2 are the projection side surface and the image source side surface of the fifth lens element 15, respectively, and list the Consic, 4TH, 6TH, 8TH, 10TH, 12TH, 14TH and 16TH of each of the glass aspheric lens elements, such that the optimal matching range of the effective radius (SD) and the maximum image height (Max IMH) is derived as 1.3< SD/Max IMH < 2.4.
As shown in fig. 1A, 1B and 1C, which are aspects of a first embodiment of a telecentric lens system 10A, the Max IMH is 8.3; the negative lens of the first lens 11 is a convex-concave lens; the negative lens of the second lens 12 is a convex-concave lens, and is also a glass aspheric lens, and the SD thereof is 16.5; the third lens 13 is a concave-convex lens with its convex surface facing the projection side; the fourth lens 14 is a meniscus lens with its convex surface facing the projection side; the fifth lens 15 is a concave-convex lens, the concave surface of which faces the projection side, and is a glass aspheric lens; the sixth lens 16 is a biconcave lens and a high-dispersion lens; the seventh lens 17 is a biconvex lens; the eighth lens element 18 is a biconvex lens element; the ninth lens 19 is a plano-convex lens with its flat surface facing the projection side and is a high dispersion lens, and a Transmissive Smooth image device (TSP) is disposed between the optical element 30 and the ninth lens 19, which is a glass plate device capable of rotating slightly and rapidly, and the resolution is enhanced by image offset synthesis, so that the 1080P resolution can be enhanced to 4K2K resolution, but not limited thereto.
| Lens | Radius | Thickness | Nd | Vd |
| L1R1 | 32.20 | 3.00 | 1.62 | 60.4 |
| L1R2 | 19.26 | 10.60 | ||
| L2R1 | 102.61 | 2.00 | 1.52 | 64.1 |
| L2R2 | 14.02 | D1 | ||
| L3R1 | 49.63 | 4.30 | 1.85 | 30.1 |
| L3R2 | 294.14 | D2 | ||
| L4R1 | 58.77 | 3.50 | 1.83 | 37.2 |
| L4R2 | 211.60 | D3 | ||
| Stop | INF | 5.00 | ||
| APRETURE | INF | 14.40 | ||
| L5R1 | -86.46 | 4.55 | 1.58 | 59.5 |
| L6R1 | -18.02 | 1.50 | 1.81 | 25.5 |
| L7R1 | 27.32 | 5.90 | 1.50 | 81.6 |
| L7R2 | -39.53 | 0.50 | ||
| L8R1 | 58.06 | 6.66 | 1.50 | 81.6 |
| L8R2 | -35.21 | 1.97 | ||
| L9R1 | INF | 4.05 | 1.92 | 18.9 |
| L9R2 | -54.45 | D4 |
Watch two
| ASPH | L2R1 | L2R2 | L5R1 | L5R2 |
| Radius | 102.61 | 14.02 | -86.46 | -18.02 |
| Conic | -- | -0.40 | -- | -- |
| 4TH | -3.01E-06 | -3.27E-05 | -1.76E-05 | -- |
| 6TH | -1.97E-09 | -8.71E-08 | 6.55E-08 | -- |
| 8TH | 3.09E-11 | 1.23E-10 | -2.63E-09 | -- |
| 10th | -1.16E-13 | -1.53E-12 | 5.47E-11 | -- |
| 12th | 1.60E-16 | 4.53E-15 | -5.20E-13 | -- |
| 14th | -- | -1.01E-17 | 1.89E-15 | -- |
| 16th | -- | -- | -- | -- |
As shown in fig. 1D, the first lens 11 and the second lens 12 are set to a focus group (FS); the third lens 13 is set to a fixed group (FX) with a first moving distance (D) between the focusing group (FS) and the fixed group (FX)1) (ii) a The fourth lens element 14 is configured as a first zoom group (Z)1) The fixed group (FX) and the first zoom group (Z)1) Has a second moving distance (D) therebetween2) (ii) a The diaphragm 20, the fifth lens 15, the sixth lens 16, the seventh lens 17, the eighth lens 18, and the ninth lens 19 are set to a second zoom group (Z)2) With the first zoom group (Z)1) And the second zoom group (Z)2) Has a third moving distance (D) therebetween3) And the second zoom group (Z)2) A fourth moving distance (D) with the transmission type smooth image device (TSP)4) The first zoom group (Z)1) And a second zoom group (Z)2) Zooming and focusing group (FS) moving are carried out in a linkage manner, a zooming telecentric lens system is also formed, and the first moving distance (D) is listed in the zooming (Zoom) of the system in cooperation with table three1) A second moving distance (D)2) A third moving distance (D)3) A fourth moving distance (D)4) The parameters of the Wide-angle end (Wide) and the telephoto end (Tele) of (1) are not limited to these.
Watch III
| Zoom | Wide | Tele |
| D1 | 41.01 | 30.67 |
| D2 | 11.36 | 2.00 |
| D3 | 1.88 | 7.72 |
| D4 | 5.50 | 9.02 |
Thus, the first embodiment of the telecentric lens system 10A, which simulates the transverse ray fans of FIG. 1E at different wavelengths (0.450, 0.480, 0.550, 0.600, 0.630 microns), respectively, exhibits different image heights (IMH) at the same imaging plane (IMA) (IMA: 0.0000mm, 1.6600mm, 3.3200mm, 4.9800mm, 6.6400mm, 8.3000mm), and the symbols ey, py, ex, px represent coordinate axes (maximum scale ± 20 microns); FIG. 1F is a plot of Field curvature and distortion with a Maximum Field of view (Maximum Field) of 35.009 degrees; FIG. 1G is a lateral chromatic aberration diagram with a Maximum Field of view (Maximum Field) of 8.3000 microns; the longitudinal aberration diagram of fig. 1H has a Pupil Radius (Pupil Radius) of 3.3807 mm, and thus it can be seen that the effective Radius (SD) and the maximum image height (Max IMH) satisfy the following condition: SD/Max IMH is more than 1.3 and less than 2.4, and good projection imaging quality is also maintained, so that the optimal matching range is obtained.
As shown in fig. 2A, 2B and 2C, which are second embodiment aspects of telecentric lens system 10B, the Max IMH is 7.803; the negative lens of the first lens 11 is a convex-concave lens; the negative lens of the second lens 12 is a convex-concave lens, and is also a glass aspheric lens, and the SD is 15; the third lens 13 is a concave-convex lens with its concave surface facing the projection side; the fourth lens 14 is a meniscus lens with its convex surface facing the projection side; the fifth lens element 15 is a biconvex lens element; the sixth lens 16 is a biconcave lens and a high-dispersion lens; the seventh lens 17 is a biconvex lens and a glass aspheric lens; the eighth lens element 18 is a biconvex lens element; the ninth lens element 19 is a double-convex lens element and a high dispersion lens element, and the third lens element 13 and the fourth lens element 14 are set as a focus group to form a telecentric lens system.
Watch four
| Lens | Radius | Thickness | Nd | Vd |
| L1R1 | 38.02 | 3.00 | 1.77 | 49.6 |
| L1R2 | 17.52 | 8.02 | ||
| L2R1 | 30.09 | 3.00 | 1.61 | 57.9 |
| L2R2 | 8.79 | 28.85 | ||
| L3R1 | -69.65 | 8.00 | 1.80 | 35.0 |
| L3R2 | -35.69 | 0.36 | ||
| L4R1 | 29.15 | 6.40 | 1.77 | 49.6 |
| L4R2 | 134.50 | 16.24 | ||
| Stop | INF | 4.00 | ||
| APERTURE | INF | 3.66 | ||
| L5R1 | 27.04 | 4.80 | 1.44 | 95.1 |
| L6R1 | -15.71 | 1.08 | 1.85 | 23.8 |
| L7R1 | 13.08 | 5.30 | 1.51 | 63.9 |
| L7R2 | -40.94 | 3.22 | ||
| L8R1 | 234.61 | 4.92 | 1.50 | 81.6 |
| L8R2 | -23.35 | 0.95 | ||
| L9R1 | 88.45 | 4.60 | 1.92 | 18.9 |
| L9R2 | -42.73 | 4.50 |
Watch five
| ASPH | L2R1 | L2R2 | L7R1 | L7R2 |
| Radius | 30.09 | 8.79 | 13.08 | -40.94 |
| Conic | -13.41 | -0.90 | -- | -- |
| 4TH | -1.11E-05 | -1.04E-04 | -- | 1.79E-05 |
| 6TH | 5.26E-09 | 1.44E-07 | -- | -2.44E-07 |
| 8TH | 6.11E-11 | -5.24E-10 | -- | 3.08E-09 |
| 10th | -4.14E-13 | -2.17E-12 | -- | -1.00E-10 |
| 12th | 4.53E-16 | 3.05E-14 | -- | 1.31E-13 |
| 14th | 7.18E-19 | -1.40E-16 | -- | 2.22E-14 |
| 16th | -- | 2.57E-19 | -- | -2.61E-16 |
Thus, the second embodiment of telecentric lens system 10B, which simulates the transverse ray fan plot of figure 2D at different wavelengths (0.452, 0.550, 0.624 microns, which present different image heights (IMH) in the same imaging plane (IMA) (IMA: 0.0000mm, 1.5610mm, 3.1210mm, 4.6820mm, 6.2420mm, 7.8030mm), and the symbols ey, py, ex, px represent coordinate axes (maximum scale ± 20 microns); the field curvature and distortion plot of figure 2E, its Maximum Field of view (Maximum Field) is 42.539 degrees; the lateral color difference map of figure 2F, its Maximum Field of view (Maximum Field) is 7.8030 microns; the longitudinal aberration diagram of figure 2G, its Pupil Radius (Pupil Radius) is 2.3997 mm, from which it can be seen that the effective Radius (SD) and the maximum image height (Max IMH) meet the following condition: SD/Max IMH is more than 1.3 and less than 2.4, and good projection imaging quality is also maintained, so that the optimal matching range is obtained.
As shown in fig. 3A, 3B and 3C, which are third exemplary aspects of telecentric lens system 10C, the Max IMH is 7.803; the negative lens of the first lens 11 is a convex-concave lens, and is a glass aspheric lens, and the SD is 12; the negative lens of the second lens 12 is a biconcave lens; the third lens element 13 is a biconvex lens element, and forms a compound lens element with the second lens element 12; the fourth lens 14 is a meniscus lens with its convex surface facing the projection side; the fifth lens 15 is a concave-convex lens, the concave surface of which faces the projection side, and is a glass aspheric lens; the sixth lens 16 is a biconcave lens and a high-dispersion lens; the seventh lens 17 is a biconvex lens; the eighth lens element 18 is a biconvex lens element; the ninth lens element 19 is a double-convex lens element and a high dispersion lens element, and the first lens element 11, the second lens element 12, the third lens element 13, the fourth lens element 14, the stop 20, the fifth lens element 15, the sixth lens element 16, the seventh lens element 17, the eighth lens element 18, and the ninth lens element 19 are set as a focus group, and another fixed-focus telecentric lens system is also formed.
Watch six
| Lens | Radius | Thickness | Nd | Vd |
| L1R1 | 23.19 | 2.00 | 1.81 | 40.9 |
| L1R2 | 7.50 | 8.70 | ||
| L2R1 | -21.46 | 6.20 | 1.49 | 70.4 |
| L3R1 | 48.65 | 5.35 | 1.74 | 44.9 |
| L3R2 | -29.46 | 0.20 | ||
| L4R1 | 17.09 | 4.60 | 1.80 | 46.6 |
| L4R2 | 61.74 | 5.00 | ||
| Stop | INF | 6.50 | ||
| APERTURE | INF | 3.55 | ||
| L5R1 | -25.64 | 3.50 | 1.58 | 59.2 |
| L6R1 | -7.50 | 2.00 | 1.85 | 23.8 |
| L7R1 | 39.80 | 5.00 | 1.50 | 81.6 |
| L7R2 | -14.39 | 0.30 | ||
| L8R1 | 94.39 | 5.40 | 1.50 | 81.6 |
| L8R2 | -19.84 | 0.20 | ||
| L9R1 | 79.31 | 3.90 | 1.92 | 18.9 |
| L9R2 | -54.22 | 4.50 |
Watch seven
| ASPH | L1R1 | L1R2 | L5R1 | L5R2 |
| Radius | 23.19 | 7.50 | -25.64 | -7.50 |
| Conic | -20.37 | -0.61 | -- | -- |
| 4TH | 3.34E-05 | -2.27E-04 | -1.08E-04 | -- |
| 6TH | -4.39E-07 | 2.55E-06 | -2.26E-05 | -- |
| 8TH | 4.56E-09 | -5.21E-08 | 5.45E-06 | -- |
| 10th | -4.23E-11 | 5.95E-10 | -6.78E-07 | -- |
| 12th | 2.67E-13 | -5.06E-12 | 4.54E-08 | -- |
| 14th | -9.45E-16 | 2.58E-14 | -1.56E-09 | -- |
| 16th | 1.41E-18 | -6.61E-17 | 2.15E-11 | -- |
Thus, the third embodiment of the telecentric lens system 10C, which simulates the transverse ray fan of FIG. 3D at different wavelengths (0.452, 0.550, 0.624 microns), respectively, exhibits different image heights (IMH) at the same imaging plane (IMA) (IMA: 0.0000mm, 1.5610mm, 3.1210mm, 4.6820mm, 6.2420mm, 7.8030mm), and the symbols ey, py, ex, px represent coordinate axes (maximum scale ± 20 microns); FIG. 3E is a Field curvature and distortion plot with a Maximum Field of view (Maximum Field) of 36.688 degrees; FIG. 3F is a lateral chromatic aberration diagram with a Maximum Field of view (Maximum Field) of 7.8030 microns; the longitudinal aberration diagram of fig. 3G has a Pupil Radius (Pupil Radius) of 2.5088 mm, and it can be seen that the effective Radius (SD) and the maximum image height (Max IMH) satisfy the following condition: SD/Max IMH is more than 1.3 and less than 2.4, and good projection imaging quality is also maintained, so that the optimal matching range is obtained.
Based on the above structure, the present invention can balance the projection imaging quality with the manufacturing cost and volume within a certain matching range by the technical characteristics of matching of the effective radius (SD) and the maximum image height (Max IMH), and the matching range has a certain degree of stability, and can be applied to the first to third embodiments.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
In summary, the present invention fully meets the needs of industrial development in terms of structural design, practical use and cost effectiveness, and the disclosed structure has an unprecedented innovative structure, novelty, creativity and practicability, and meets the requirements of the patent requirements of the invention, so that the application is filed by law.
Claims (8)
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| CN201710580031.2A CN109270669B (en) | 2017-07-17 | 2017-07-17 | Telecentric lens system |
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| CN201710580031.2A CN109270669B (en) | 2017-07-17 | 2017-07-17 | Telecentric lens system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN211043914U (en) | 2019-12-26 | 2020-07-17 | 中强光电股份有限公司 | Projection lens module and projector |
| CN113253444B (en) * | 2020-02-11 | 2023-05-02 | 上旸光学股份有限公司 | Zoom projection system |
| CN113534407B (en) * | 2021-06-30 | 2023-11-07 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10170824A (en) * | 1996-12-16 | 1998-06-26 | Ricoh Opt Ind Co Ltd | Projection lens |
| US6275343B1 (en) * | 1999-04-20 | 2001-08-14 | Minolta Co., Ltd. | Projection optical system |
| CN102236159A (en) * | 2010-04-28 | 2011-11-09 | 富士胶片株式会社 | Zoom lens for projection and projection-type display apparatus |
| CN103048776A (en) * | 2011-10-17 | 2013-04-17 | 精工爱普生株式会社 | Projection zoom lens |
| CN105652421A (en) * | 2016-04-01 | 2016-06-08 | 江苏大学 | Camera lens for digital projector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060028741A1 (en) * | 2004-08-04 | 2006-02-09 | 3M Innovative Properties Company | Projection lenses having color-correcting rear lens units |
-
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10170824A (en) * | 1996-12-16 | 1998-06-26 | Ricoh Opt Ind Co Ltd | Projection lens |
| US6275343B1 (en) * | 1999-04-20 | 2001-08-14 | Minolta Co., Ltd. | Projection optical system |
| CN102236159A (en) * | 2010-04-28 | 2011-11-09 | 富士胶片株式会社 | Zoom lens for projection and projection-type display apparatus |
| CN103048776A (en) * | 2011-10-17 | 2013-04-17 | 精工爱普生株式会社 | Projection zoom lens |
| CN105652421A (en) * | 2016-04-01 | 2016-06-08 | 江苏大学 | Camera lens for digital projector |
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