CN101285925B - Focus fixing lens - Google Patents
Focus fixing lens Download PDFInfo
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- CN101285925B CN101285925B CN200710091752A CN200710091752A CN101285925B CN 101285925 B CN101285925 B CN 101285925B CN 200710091752 A CN200710091752 A CN 200710091752A CN 200710091752 A CN200710091752 A CN 200710091752A CN 101285925 B CN101285925 B CN 101285925B
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- 230000005499 meniscus Effects 0.000 claims description 6
- 241000219739 Lens Species 0.000 description 167
- 210000000695 crystalline len Anatomy 0.000 description 167
- 230000003287 optical effect Effects 0.000 description 12
- 230000004075 alteration Effects 0.000 description 11
- 239000011521 glass Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000003442 weekly effect Effects 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000006059 cover glass Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
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Abstract
The invention relates to a fixed-focus lens comprising a first lens group and a second lens group the dioptre of which are all positive, wherein, the first lens group consists of a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged in order from an object side to an image side, wherein, the dioptre from the first lens to the fifth lens is orderly negative, negative, negative, positive and positive, and the first lens is an aspheric lens; the second lens group consists of two balsaming lenses and a positive lens positioned between the two balsaming lenses; the fixed-focus lens meets the following conditions: (1) FL45 is more than 5.0 and less than 7.5; (2) FG2/F is more than 3.5 and less than 4.8; (3) FG2/H is more than 3.755, wherein, FL45 refers to the effective focal length between the fourth lens and the fifth lens of the first lens group; the FG2 is the effective focal length of the second lens group; F refers to the effective focal length of the fixed-focus lens; and H refers to the maximum image height on the image side.
Description
Technical field
The invention relates to a kind of camera lens, and particularly relevant for a kind of tight shot.
Background technology
Please refer to Fig. 1, the tight shot 100 that disclosed tradition is applied to back projection TV in No. 6542316 patent case of the U.S. comprises one first lens group 110, one second lens group 120 and one the 3rd lens group of being arranged in regular turn by thing side to a light valve (light valve) 50 130.First lens group 110 comprises that six-element lens 112,114,116,117,118,119, the second lens groups 120 comprise a slice lens 122, and the 3rd lens group 130 comprises four lens 132,134,136,138.
Because the lens numbers of traditional tight shot 100 is more, so production cost is higher.In addition, the more length of tight shot 100 that also causes of lens numbers is longer, and (rear projection television, thickness RPTV) is thicker to cause adopting the back projection TV of this tight shot 100.If will reduce the thickness of back projection TV, then can cause the optical imagery aberration to become big, even all phenomenons that can influence image quality such as ghost (ghost image) occur.
Summary of the invention
A purpose of the present invention provides a kind of tight shot, and it has the advantage that volume is little and image quality is good.
Other purposes of the present invention and advantage can be further understood from technical characterictic disclosed in this invention.
For reaching one of above-mentioned or partly or all purposes or other purposes, the present invention proposes a kind of tight shot, and it comprises that diopter is one first positive lens group and one second lens group.First lens group is made up of one first lens, one second lens, one the 3rd lens, one the 4th lens and one the 5th lens arranged in regular turn to a picture side (image side) from a thing side (object side).That the diopter of first lens to the, five lens is respectively is negative, negative, negative, positive, just, and first lens are non-spherical lens.In addition, second lens group is disposed between first lens group and the picture side, and by being formed from thing side to one the 6th lens, one the 7th lens, one the 8th lens with positive diopter, one the 9th lens and 1 the tenth lens arranged in regular turn as side.The 6th lens and the 7th lens are formed one first balsaming lens (cemented lens), and the 9th lens and the tenth lens are formed one second balsaming lens.In addition, tight shot meets following condition: (1) 5.0＜FL45/F＜7.5; (2) 3.5＜FG2/F＜4.8; (3) FG2/H＞3.755, wherein FL45 be the 4th lens to the five lens effective focal length (effective focal length, EFL), FG2 is the effective focal length of second lens group, F is the effective focal length of tight shot, H for the picture side maximum image height.
Compared to conventional art, the lens numbers of tight shot of the present invention is less, so can save production cost and dwindle small product size.In addition, the framework of tight shot of the present invention can effectively be eliminated aberration (aberration), therefore has good image quality.
For above-mentioned feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the structural representation of traditional tight shot.
Fig. 2 is the structural representation of the tight shot of one embodiment of the invention.
Fig. 3 A to Fig. 3 C is the image optics digital simulation figure of the tight shot of Fig. 2.
Fig. 4 is the structural representation of the tight shot of another embodiment of the present invention.
Fig. 5 A to Fig. 5 C is the image optics digital simulation figure of the tight shot of Fig. 4.
Fig. 6 is the structural representation of the tight shot of further embodiment of this invention.
Fig. 7 A to Fig. 7 C is the image optics digital simulation figure of the tight shot of Fig. 6.
Fig. 8 is the structural representation of the tight shot of another embodiment of the present invention.
The main element symbol description
30: level and smooth image element
40: inner full-reflection prism
50: light valve
60: the image processing element
70: polaroid
80: the contrast coupling element
90: glass cover
100,200,200 ': tight shot
110,210: the first lens groups
112,114,116,117,118,119,122,132,134,136,138: lens
120,220: the second lens groups
130: the three lens groups
212: the first lens
214: the second lens
215: the three lens
216: the four lens
218: the five lens
222: the six lens
223: the first balsaming lenss
224: the seven lens
225: the eight lens
226: the nine lens
227: the second balsaming lenss
228: the ten lens
230: aperture
S1～S25: surface
Embodiment
The explanation of following each embodiment is graphic with reference to what add, can be in order to the specific embodiment of implementing in order to illustration the present invention.The direction term that the present invention mentioned, for example upper and lower, front, rear, left and right etc. only are directions with reference to the accompanying drawings.Therefore, the direction term of use is to be used for explanation, but not is used for limiting the present invention.
Fig. 2 is the structural representation of the tight shot of one embodiment of the invention.Please refer to Fig. 2, the tight shot 200 of present embodiment comprises one first lens group 210 and one second lens group 220, and the diopter of first and second lens group 210,220 just is.First lens group 210 is made up of one first lens 212, one second lens 214, one the 3rd lens 215, one the 4th lens 216 and one the 5th lens 218 arranged in regular turn as side from a thing side to.That the diopter of first lens, 212 to the 5th lens 218 is respectively is negative, negative, negative, positive, just.In the present embodiment, first lens 212 and second lens 214 are the meniscus of convex surface (surperficial S1, S3) towards the thing side, and first lens 212 are non-spherical lens, and the convex surface of first lens 212 and concave surface (surperficial S2) are aspheric surface.The 3rd lens 215 are biconcave lens, and the 4th lens 216 for example are the concave-convex lens of convex surface (surperficial S8) towards the picture side, and the 5th lens 218 are biconvex lens.Second lens 214, the 3rd lens 215, the 4th lens 216 and the 5th lens 218 are spherical lens.
Tight shot 200 meets following condition: (1) 5.0＜FL45/F＜7.5; (2) 3.5＜FG2/F＜4.8; (3) FG2/H＞3.755, wherein FL45 is the effective focal length of the 4th lens 216 to the 5th lens 218, and FG2 is the effective focal length of second lens group 220, and F is the effective focal length of tight shot 200, and H is the maximum image height of picture side.Generally speaking, be provided with an image processing element 60 as side, and image processing element 60 for example is a light valve in the present embodiment.Maximum image height H then images in image height on the image processing element 60 for actual object.In addition, tight shot 200 for example also comprises an aperture 230, and it is disposed between first lens group 210 and second lens group 220.
The tight shot 200 of present embodiment reaches the elimination aberration by a slice non-spherical lens (i.e. first lens 212) nine spherical lenses of collocation (i.e. second lens to the, ten lens), wherein, non-spherical lens more can help to eliminate above big field angle (the field of view of 90 degree, FOV) distortion that is produced (distortion), and second lens group 220 can color difference eliminating (chromatic aberration) and spherical aberration (spherical aberration).The tight shot of being formed by ten a slice lens compared to tradition 100 (as shown in Figure 1), the lens numbers of tight shot 200 of the present invention is less, thus can save the material cost of lens, and can reduce the accumulation of tolerance, improve and produce yield, and then reduce production costs.
For further guaranteeing to decide image quality, can make in the present embodiment tight shot 200 meet following condition at least one of them: (1) 2.0＜DG12/FG2＜5.0; (2) 1.3＜| FL67/FL910|＜5.5; (3) 15＜Vp-Vn＜45; (4) 1.35＜| R15/R16|＜4.2.Wherein, DG12 is the distance of first lens group, 210 to second lens groups 220, and FL67 is the effective focal length of first balsaming lens 223, and FL910 is the effective focal length of second balsaming lens 227.In addition, one of them diopter of first balsaming lens 223 and second balsaming lens 227 is being for example for just, and another diopter is for example for negative, and the Abbe number of Vp to be diopter be positive balsaming lens, Vn is that diopter is the balsaming lens of bearing.In addition, R15 is the radius-of-curvature on the surface towards the thing side (surperficial S15) of the 8th lens 225, and R16 is the radius-of-curvature towards the surface (surperficial S16) that looks like side of the 8th lens 225.
Following content will be enumerated an embodiment of tight shot 200.Be noted that listed data information is not that any those skilled in the art are after reference the present invention in order to qualification the present invention in following table one and the table two, when doing suitable change to its parameter or setting, it must belong in the category of the present invention.
＜table one 〉
In Table 1, spacing is meant the air line distance on main shaft between two adjacent surfaces, for instance, the spacing of surperficial S1, promptly surperficial S1 is to the air line distance on main shaft between surperficial S2.The pairing thickness of each lens, refractive index and Abbe number please be joined each spacing in the same column, refractive index and Abbe number value corresponding in the remarks column.In addition, in Table 1, surperficial S1, S2 are two surfaces of first lens 212, S3, S4 are two surfaces of second lens 214 on the surface, surface S5, S6 are two surfaces of the 3rd lens 216, and surperficial S7, S8 are two surfaces of the 4th lens 222, and surperficial S9, S10 are two surfaces of the 5th lens 232.Surface S11 is an aperture.Surface S12 is the surface towards the thing side of the 6th lens 222, and surperficial S13 is the surface that the 6th lens 222 link to each other with the 7th lens 224, and surperficial S14 is the surface towards the picture side of the 7th lens 224.S15, S16 are two surfaces of the 8th lens 225 on the surface.Surface S17 is the surface towards the thing side of the 9th lens 226, and surperficial S18 is the surface that the 9th lens 226 link to each other with the tenth lens 228, and surperficial S19 is the surface towards the picture side of the tenth lens 228.S20, S21 are two surfaces of a polaroid (polarizer) 70 on the surface; surface S22, S23 are a contrast coupling element (contrastcoupler) 80 two surfaces, and surperficial S24, S25 one are used to protect two surfaces of the glass cover (cover glass) 90 of image processing element 60.The spacing of being filled out in surface those row of S25 (row) is the spacing of surperficial S25 to image processing element 60.
Relevant for parameter values such as each surperficial radius-of-curvature, spacings, please refer to table one, no longer repeat at this.
Above-mentioned surperficial S1, S2 is aspheric surface, and its available following formulate:
In the formula, Z is the side-play amount (sag) of optical axis direction, and c is the inverse of the radius of osculating sphere (osculating sphere), just near the inverse of the radius-of-curvature (as the radius-of-curvature of S1, S2 in the form) at optical axis place.K is quadric surface coefficient (conic), and r is the aspheric surface height, is from the lens center height toward rims of the lens, and A1, A2, A3, A4, A5... are asphericity coefficient (aspheric coefficient), and wherein coefficient A1 is 0.What table two was listed is the parameter value of surperficial S1 and surperficial S2.
＜table two 〉
| The aspheric surface parameter | The quadric surface coefficient k | Coefficient A2 | Coefficient A3 | Coefficient A4 | Coefficient A5 |
| S1 | -89.00191 | 9.061405E-06 | -1.492399E-09 | -5.507762E-13 | 3.353505E-16 |
| S2 | -0.5289708 | 5.306156E-06 | 1.141856E-08 | -1.314713E-11 | 3.442482E-15 |
Hold above-mentionedly, the numerical aperture (f-number) of the tight shot 200 of this embodiment is 2.417, and the maximum field of view angle is 91.3 °.In addition, F=9.804mm, FL45=68.618mm, FG2=39.792mm, H=10.243mm, DG12=134.172mm, FL67=-194.731mm, FL910=98.507, FL45/F=6.999, DG12/FG2=3.372, | FL67/FL910|=1.977, FG2/F=4.059, FG2/H=3.885,26.3＜Vp-Vn＜30.8.
Fig. 3 A to Fig. 3 C is the image optics simulated data figure of the tight shot of Fig. 2.Please refer to Fig. 3 A to Fig. 3 C, wherein Fig. 3 A is optical transfer function curve map (modulation transfer function, MTF), its transverse axis be weekly the phase/spatial frequency (spatial frequency in cycles permillimeter) of millimeter (mm), the longitudinal axis is the modulus (modulus of the OTF) of optical transfer function.In Fig. 3 A the simulated data figure that is done with the light of wavelength between 440nm and 640nm.In addition, Fig. 3 B is lateral chromatic aberration (lateral color) figure of image, and the maximum field among Fig. 3 B (maximum field) is 10.243mm, and reference wavelength is 550nm.Fig. 3 C is the transverse light rays sector diagram (transverse ray fanplot) of image.All in the scope of standard, therefore compared to conventional art, the tight shot 200 of present embodiment can use less lens to reach the good optical quality to the figure that goes out owing to Fig. 3 A to Fig. 3 C is shown.
Following content will be enumerated another embodiment of tight shot 200.Please refer to Fig. 4, table three and table four.
＜table three 〉
＜table four 〉
| The aspheric surface parameter | The quadric surface coefficient k | Coefficient A2 | Coefficient A3 | Coefficient A4 | Coefficient A5 |
| S1 | -19.197910 | 7.500722E-06 | -1.592348E-09 | -1.789404E-13 | 2.400748E-16 |
| The aspheric surface parameter | The quadric surface coefficient k | Coefficient A2 | Coefficient A3 | Coefficient A4 | Coefficient A5 |
| S2 | -0.829450 | 9.219816E-07 | 1.278201E-08 | -1.450110E-11 | 4.112173E-15 |
In the table three, surperficial S1～S19 is identical with table one, and surperficial S20, S21 are the two opposite surfaces of inner full-reflection prism (total internal reflection prism, TIR prism) 40, and surperficial S22, S23 are two surfaces of glass cover 90.The spacing of being filled out in those row of surface S23 is the spacing of surperficial S23 to image processing element 60.
The numerical aperture of the tight shot 200 of this embodiment is 2.4, and the maximum field of view angle is 90.9 °.In addition, F=10.905mm, FL45=64.233mm, FG2=42.342mm, H=11.24mm, DG12=107.538mm, FL67=-259.217mm, FL910=105.271, FL45/F=5.89, DG12/FG2=2.54, | FL67/FL910|=2.462, FG2/F=3.883, FG2/H=3.767,27.6＜Vp-Vn＜30.8.
Fig. 5 A to Fig. 5 C is the image optics simulated data figure of the tight shot of Fig. 4.Please refer to Fig. 5 A to Fig. 5 C, wherein Fig. 5 A is the optical transfer function curve map, its transverse axis be weekly the phase/spatial frequency of millimeter, the longitudinal axis is the modulus of optical transfer function.In Fig. 5 A the simulated data figure that is done with the light of wavelength between 440nm and 640nm.In addition, Fig. 5 B is the lateral chromatic aberration figure of image, and the maximum field among Fig. 5 B is 11.24mm, and reference wavelength is 550nm.Fig. 5 C is the transverse light rays sector diagram of image.All in the scope of standard, therefore compared to conventional art, the tight shot 200 of present embodiment can use less lens to reach the good optical quality to the figure that goes out owing to Fig. 5 A to Fig. 5 C is shown.
Following content will be enumerated the another embodiment of tight shot 200.Please refer to Fig. 6, table five and table six.
＜table five 〉
＜table six 〉
| The aspheric surface parameter | The quadric surface coefficient k | Coefficient A2 | Coefficient A3 | Coefficient A4 | Coefficient A5 |
| S1 | -163.3925 | 8.756840E-06 | -1.598966E-09 | -1.736070E-13 | 2.737983E-16 |
| S2 | -0.5796957 | 4.181319E-06 | 1.225761E-08 | -1.448743E-11 | 4.066283E-15 |
In the table five, S1～S19 is identical with table one on the surface, surface S20, S21 are two surfaces of level and smooth image element (smooth picture element) 30, and surperficial S22, S23 are the two opposite surfaces of inner full-reflection prism 40, and surperficial S24, S25 are two surfaces of glass cover 90.The spacing of being filled out in those row of surface S25 is the spacing of surperficial S23 to image processing element 60.
The numerical aperture of the tight shot 200 of this embodiment is 2.4, and the maximum field of view angle is 90.9 °.In addition, F=10.413mm, FL45=65.653mm, FG2=41.565mm, H=10.706mm, DG12=104.988mm, FL67=-462.489mm, FL910=110.426, FL45/F=6.3, DG12/FG2=2.526, | FL67/FL910|=4.188, FG2/F=3.99, FG2/H=3.88,27.6＜Vp-Vn＜42.
Fig. 7 A to Fig. 7 C is the image optics simulated data figure of the tight shot of Fig. 6.Please refer to Fig. 7 A to Fig. 7 C, wherein Fig. 7 A is the optical transfer function curve map, its transverse axis be weekly the phase/spatial frequency of millimeter, the longitudinal axis is the modulus of optical transfer function.In Fig. 7 A the simulated data figure that is done with the light of wavelength between 430nm and 670nm.In addition, Fig. 7 B is the lateral chromatic aberration figure of image, and the maximum field among Fig. 7 B is 10.7061mm, and reference wavelength is 550nm.Fig. 7 C is the transverse light rays sector diagram of image.All in the scope of standard, therefore compared to conventional art, the tight shot 200 of present embodiment can use less lens to reach the good optical quality to the figure that goes out owing to Fig. 7 A to Fig. 7 C is shown.
Fig. 8 is the structural representation of the tight shot of another embodiment of the present invention.Please refer to Fig. 8, the tight shot 200 ' of present embodiment is similar to the tight shot of Fig. 2 200, and difference is in tight shot 200 ' and also comprises a reflecting element 240, and it is disposed between first lens group 210 and second lens group 220.In other words, tight shot 200 ' is a L type camera lens.Because the length of tight shot 200 ' is shorter, it can make and adopt the back projection TV of this tight shot 200 ' can do thinlyyer.
In sum, tight shot of the present invention has following advantage at least:
1. the tight shot of being formed by ten a slice lens compared to tradition 100, tight shot of the present invention 200,200 ' lens numbers are less, thus can save the material cost of lens, and can reduce the accumulation of tolerance, produce yield to improve, and then reduce production costs.
2. the framework of tight shot of the present invention can effectively be eliminated aberration, therefore has good image quality.
3. tight shot of the present invention can be L type camera lens, so can effectively lower the camera lens total length, makes and adopts the back projection TV of tight shot of the present invention can do thinlyyer.
Though the present invention with preferred embodiment openly as above; right its is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking claims person of defining.In addition, arbitrary embodiment of the present invention or claim must not reached whole purpose disclosed in this invention or advantage or characteristics.In addition, summary part and title only are the usefulness that is used for assisting the patent document search, are not to be used for limiting interest field of the present invention.
Claims (8)
1. tight shot comprises:
One first lens group, has positive diopter, this first lens group is one first lens of arranging in regular turn as side by from a thing side to, one second lens, one the 3rd lens, one the 4th lens and one the 5th lens are formed, wherein these first lens to the diopter of the 5th lens is respectively negative, negative, negative, just, just, and these first lens are non-spherical lens, and these first lens and this second lens are the meniscus of convex surface towards the thing side, the 3rd lens are biconcave lens, the 4th lens are the concave-convex lens of convex surface towards the picture side, and the 5th lens are biconvex lens; And
One second lens group, has positive diopter, and be disposed at this first lens group and this is as between the side, this second lens group be by from this thing side to these one the 6th lens of arranging in regular turn as side, one the 7th lens, one the 8th lens with positive diopter, one the 9th lens and 1 the tenth lens are formed, the 6th lens wherein, the 7th lens, the diopter of the 9th lens and the tenth lens just is respectively, negative, negative, just, wherein the 6th lens and the 7th lens are formed one first balsaming lens, and the 9th lens and the tenth lens are formed one second balsaming lens, and the 6th lens are that convex surface is towards this concave-convex lens as side, the 7th lens are that convex surface is towards this meniscus as side, the 8th lens and the tenth lens are biconvex lens, the 9th lens are the meniscus of convex surface towards this thing side
Wherein, FL45 is the effective focal lengths of the 4th lens to the 5th lens, and FG2 is the effective focal length of this second lens group, F is the effective focal length of this tight shot, and H is this maximum image height as side, and 5.0＜FL45/F＜7.5,3.5＜FG2/F＜4.8, FG2/H＞3.755.
2. tight shot according to claim 1 also comprises an aperture, is disposed between this first lens group and this second lens group.
3. tight shot according to claim 1 also comprises a reflecting element, is disposed between this first lens group and this second lens group.
4. tight shot according to claim 1, wherein DG12 is the distance of this first lens group to this second lens group, and 2.0＜DG12/FG2＜5.0.
5. tight shot according to claim 1, wherein FL67 is the effective focal length of this first balsaming lens, FL910 is the effective focal length of this second balsaming lens, and 1.3＜| FL67/FL910|＜5.5.
6. tight shot according to claim 5, wherein one of them diopter of this first balsaming lens and this second balsaming lens is for just, another diopter is for negative, diopter is that the Abbe number of positive balsaming lens is Vp, diopter is Vn for the Abbe number of negative balsaming lens, and 15＜Vp-Vn＜45.
7. tight shot according to claim 1, wherein the radius-of-curvature towards the surface of this thing side of the 8th lens is R15, the 8th lens be R16 towards this radius-of-curvature as the surface of side, and 1.35＜| R15/R16|＜4.2.
8. tight shot according to claim 1, wherein these second lens to the tenth lens are spherical lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710091752A CN101285925B (en) | 2007-04-09 | 2007-04-09 | Focus fixing lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710091752A CN101285925B (en) | 2007-04-09 | 2007-04-09 | Focus fixing lens |
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| Publication Number | Publication Date |
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| CN101285925A CN101285925A (en) | 2008-10-15 |
| CN101285925B true CN101285925B (en) | 2010-05-26 |
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| CN200710091752A Expired - Fee Related CN101285925B (en) | 2007-04-09 | 2007-04-09 | Focus fixing lens |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102043229B (en) * | 2009-10-15 | 2012-05-23 | 扬明光学股份有限公司 | Prime lens |
| CN102221767A (en) * | 2011-06-29 | 2011-10-19 | 苏州佳世达光电有限公司 | Projector |
| CN102253465B (en) * | 2011-08-03 | 2013-03-06 | 福建省光学技术研究所 | Vision lens of high-definition fixed-focus machine |
| CN108983400B (en) * | 2017-06-01 | 2021-11-12 | 富晋精密工业（晋城）有限公司 | Super wide-angle lens |
| CN110764221B (en) * | 2018-07-25 | 2021-09-17 | 上旸光学股份有限公司 | Projection lens system |
| CN112835176B (en) * | 2019-11-25 | 2022-07-15 | 上旸光学股份有限公司 | High-resolution prime lens |
| CN114176483B (en) * | 2021-12-16 | 2023-08-29 | 重庆西山科技股份有限公司 | Polarized light endoscope device camera optical system, camera and endoscope device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1661417A (en) * | 2004-02-24 | 2005-08-31 | 三星电子株式会社 | Retrofocus type projection optical system |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1661417A (en) * | 2004-02-24 | 2005-08-31 | 三星电子株式会社 | Retrofocus type projection optical system |
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