CN220509204U - 4K high definition LCD projection lens - Google Patents
4K high definition LCD projection lens Download PDFInfo
- Publication number
- CN220509204U CN220509204U CN202322002869.7U CN202322002869U CN220509204U CN 220509204 U CN220509204 U CN 220509204U CN 202322002869 U CN202322002869 U CN 202322002869U CN 220509204 U CN220509204 U CN 220509204U
- Authority
- CN
- China
- Prior art keywords
- lens
- focal length
- focal power
- meniscus
- refractive index
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005499 meniscus Effects 0.000 claims abstract description 35
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 239000005308 flint glass Substances 0.000 claims description 11
- 239000005331 crown glasses (windows) Substances 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 10
- 238000005452 bending Methods 0.000 claims description 9
- 229910052788 barium Inorganic materials 0.000 claims description 7
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052746 lanthanum Inorganic materials 0.000 claims description 4
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 9
- 238000003384 imaging method Methods 0.000 abstract description 9
- 239000005304 optical glass Substances 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Lenses (AREA)
Abstract
The utility model discloses a 4K high-definition LCD projection lens, which comprises a meniscus negative focal power first lens, a meniscus positive focal power second lens, a meniscus negative focal power third lens, a biconvex positive focal power fourth lens, a bonding lens formed by a meniscus positive focal power fifth lens and a meniscus negative focal power sixth lens, a meniscus positive focal power seventh lens, a Fresnel lens and an LCD liquid crystal display screen, wherein the meniscus negative focal power first lens, the meniscus positive focal power second lens, the meniscus negative focal power third lens, the biconvex positive focal power fourth lens, the bonding lens formed by a meniscus positive focal power fifth lens and a meniscus negative focal power sixth lens, the meniscus positive focal power seventh lens, the Fresnel lens and the LCD liquid crystal display screen, and a diaphragm is arranged between the fourth lens and the bonding lens. The effective focal length F' =137.36 mm, the relative aperture number F/# =3.0, the projection ratio 1.2, the total length of the optical system is smaller than 90mm, the projection size range is 40-150 inches of the projection picture, and the resolution of 3840 x 2160 pixels is 3840, so that the 4K high-definition imaging effect is achieved.
Description
Technical Field
The utility model relates to an objective lens imaging lens, in particular to a 4K high-definition LCD projection lens, which is a 4K high-definition LCD projection lens suitable for an imaging system.
Background
An LCD (liquid crystal display ), i.e., a liquid crystal display technology, uses the photoelectric effect of liquid crystal molecules to change the transmittance or reflectance of a liquid crystal cell to realize picture display.
In recent years, with the shortage of supply in the semiconductor industry chain and under the influence of the global demand increment brought by epidemic home economy and European and American loose currency policy, the projector light valve market pattern is undergoing a structural change of-! The single-chip LCD home projector is rapidly developed at low cost.
The monolithic LCD optical system consists of one liquid crystal panel. White light emitted by the light source is changed into regular parallel light through the first Fresnel lens, polarized light is formed through the polaroid, image light with different colors is transmitted after passing through the middle LCD panel, the image light is focused and enhanced by the second Fresnel lens, and finally a projection display picture is projected through the total reflection mirror. The performance of the projection lens as an important component of LCD projection products directly influences the display effect of the projection products.
The resolution of the conventional LCD projection lens is generally 720P to 1080P, the picture imaging effect is poor, and along with the improvement of the performance requirements of people on projector products, the development of a 4K high-definition LCD projection lens with excellent performance is urgently needed.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a 4K high-definition LCD projection lens with good picture imaging effect so as to meet the requirements of people on the performance of projector products.
In order to solve the technical problems, the utility model adopts the following technical scheme: A4K high-definition LCD projection lens is an optical system lens group composed of 6 groups of 7 lens assemblies, wherein the optical system lens group sequentially comprises a meniscus negative focal power first lens bent to the right, a meniscus positive focal power second lens bent to the right, a meniscus negative focal power third lens bent to the right, a biconvex positive focal power fourth lens, a cemented lens composed of a meniscus positive focal power fifth lens bent to the left and a meniscus negative focal power sixth lens bent to the left, a meniscus positive focal power seventh lens bent to the left, a Fresnel lens and an LCD liquid crystal display screen along the incidence direction of light rays from the left to the right, and a diaphragm is positioned between the fourth lens and the cemented lens.
The focal length of the LCD lens is defined as f ', the back focal length is defined as lf', the focal length of the first lens is defined as f '1, the focal length of the second lens is defined as f'2, the focal length of the third lens is defined as f '3, the focal length of the fourth lens is defined as f'4, the focal length of the cemented lens composed of the fifth lens and the sixth lens is defined as f '56, and the focal length of the seventh lens is defined as f'7, then:
the focal length f 'and the back focal length lf' satisfy the relation |lf '/f' | < 0.05;
the focal length f '1 of the first lens and the focal length f' of the lens satisfy the relation
0.5＜∣f’1/f’∣＜0.82；
The focal length f '2 of the second lens and the focal length f' of the lens satisfy the relation
0＜∣f’2/f’∣＜0.4；
The focal length f '3 of the third lens and the focal length f' of the lens satisfy the relation
0.5＜∣f’3/f’∣＜0.55；
The focal length f '4 of the fourth lens and the focal length f' of the lens satisfy the relation
1＜∣f’4/f’∣＜1.2；
The focal length f '56 of the cemented lens formed by the fifth lens and the sixth lens and the focal length f' of the lens satisfy the relation 1 < |f '56/f' | < 1.22;
the focal length f '7 of the seventh lens and the focal length f' of the lens satisfy the relation
0.7＜∣f’7/f’∣＜0.87。
The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens form a cemented lens and a seventh lens are all spherical glass lenses, wherein the first lens is barium crown glass, the second lens and the seventh lens are heavy lanthanum flint glass, the third lens is heavy flint glass, the fourth lens is crown glass, the fifth lens is heavy crown glass, and the sixth lens is heavy barium flint glass.
The bending radius of the 7 lenses is defined as a left bending sign "-", a right bending sign "+", a lens thickness t, a refractive index n and an air gap d, and then:
further, the refractive index of the first lens is 1.568, the refractive index of the second lens and the seventh lens is 1.804, the refractive index of the third lens is 1.717, the refractive index of the fourth lens is 1.516, the refractive index of the fifth lens is 1.589, and the refractive index of the sixth lens is 1.701.
According to the 4K high-definition LCD projection lens designed by the technical scheme, through the combination of the selection of the optical glass materials and the matching of different curvature radiuses, the 5inch LCD lens is designed, the effective focal length F' =137.36 mm, the relative aperture number F/# =3.0, the projection ratio is 1.2, the total length of the optical system is smaller than 90mm, the projection size range is 40-150 inches, the resolution of 3840 x 2160 pixels is 3840, and the 4K high-definition imaging effect is achieved.
Drawings
FIG. 1 is a diagram of an optical glass without light ray according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of an optical glass with light rays according to an embodiment of the present utility model;
fig. 3 is a graph of MTF (modulation transfer function) for an embodiment of the present utility model, in which the abscissa represents spatial frequency in units: line pair/millimeter (lp/mm), the ordinate indicates the MTF value;
FIG. 4 is a graph of field curvature/distortion effect for an embodiment of the present utility model, with the abscissa representing percent distortion and the ordinate representing field of view;
fig. 5 is a dot column diagram of an embodiment of the present utility model.
Detailed Description
The utility model relates to a 4K high-definition LCD projection lens, which is specifically described below with reference to the accompanying drawings.
The utility model relates to a 4K high-definition LCD projection lens, which is provided with an optical system lens group, referring to fig. 1 and 2, wherein the optical system lens group is formed by arranging and configuring 6 groups of 7 lenses according to different combination forms, and the optical system comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a diaphragm STOP, a bonding lens L56 formed by a fifth lens and a sixth lens, a seventh lens L7, a Fresnel lens L8 and an LCD liquid crystal screen L9 in sequence along the incidence direction of light rays from left to right.
The first lens L1 is a meniscus lens with negative focal power, the second lens L2 is a meniscus lens with positive focal power, the third lens L3 is a meniscus lens with negative focal power, the fourth lens L4 is a biconvex lens with positive focal power, the fifth lens L5 is a meniscus lens with positive focal power, the sixth lens L6 is a meniscus lens with negative focal power, the fifth lens L5 and the sixth lens L6 form a cemented lens, the seventh lens L7 is a seventh lens with positive focal power, the STOP STOP is positioned between the fourth lens L4 and the fifth lens L5 in the cemented lens, the phenanthrene lens is positioned behind the seventh lens and has the function of converging light, and the LCD liquid crystal display screen is 5inch.
The focal length of the LCD lens of the present utility model is defined as f ', the back focal length is defined as lf', the focal length of the first lens is defined as f '1, the focal length of the second lens is defined as f'2, the focal length of the third lens is defined as f '3, the focal length of the fourth lens is defined as f'4, the focal length of the cemented lens composed of the fifth lens and the sixth lens is defined as f '56, and the focal length of the seventh lens is defined as f'7, then:
the focal length f 'and the back focal length lf' satisfy the relation |lf '/f' | < 0.05;
the focal length f '1 of the first lens and the focal length f' of the lens satisfy the relation
0.5＜∣f’1/f’∣＜0.82；
The focal length f '2 of the second lens and the focal length f' of the lens satisfy the relation
0＜∣f’2/f’∣＜0.4；
The focal length f '3 of the third lens and the focal length f' of the lens satisfy the relation
0.5＜∣f’3/f’∣＜0.55；
The focal length f '4 of the fourth lens and the focal length f' of the lens satisfy the relation
1＜∣f’4/f’∣＜1.2；
The focal length f '56 of the cemented lens formed by the fifth lens and the sixth lens and the focal length f' of the lens satisfy the relation 1 < |f '56/f' | < 1.22;
the focal length f '7 of the seventh lens and the focal length f' of the lens satisfy the relation
0.7＜∣f’7/f’∣＜0.87。
The utility model discloses a lens assembly, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, wherein the first lens and the seventh lens are all glass spherical lenses, the first lens is barium crown glass, the second lens and the seventh lens are heavy lanthanum flint glass, the third lens is heavy flint glass, the fourth lens is crown glass, the fifth lens is heavy crown glass, and the sixth lens is heavy barium flint glass.
The configuration of the bending radius R (left bending sign "-", right bending sign "+"), the lens thickness t, the refractive index n, and the air gap d of the 7-piece lens of the present utility model satisfies the following requirements:
from left to right: the radius R1 of the meniscus glass negative lens L1 bent to the right ranges from (+ 77.1- + 77.11) mm, and the radius R2 ranges from (+ 34.44- + 34.46) mm; the thickness t of L1 ranges from (2.98 to 3.0) mm; the refractive index n ranges from (1.53 to 1.57), preferably 1.568; the air interval d ranges from (0.12 to 0.13) mm;
the radius R3 of the aspherical positive lens L2 of the meniscus glass bent to the right is in the range of (+ 32.9- + 32.91) mm, and the radius R4 is in the range of (+ 168.51- + 168.52) mm; the thickness t of L2 is in the range of (14.14-14.16) mm; the refractive index n ranges from (1.80 to 1.85), preferably 1.804; the air interval d ranges from (3.60 to 3.61) mm;
the radius R5 of the meniscus glass negative lens L3 bent to the right ranges from (+ 587.69- + 587.71) mm, and the radius R6 ranges from (+ 48.66- +48.67) mm; the thickness t of L3 is in the range of (1.97-1.99) mm; the refractive index n of L3 ranges from (1.68 to 1.75), preferably 1.717; the air interval d ranges from (2.14 to 2.16) mm;
the radius R7 of the biconvex glass positive lens L4 is in the range of (+ 83.62-83.63) mm, and the radius R8 is in the range of (-1234.47-1234.50) mm; the thickness t of L4 ranges from (4.37 to 4.39) mm; the refractive index n of L4 ranges from (1.49 to 1.53), preferably 1.516; the air interval d ranges from (0.85 to 0.87) mm;
diaphragm B, air interval d is (16.67-16.69) mm;
in the cemented lens group in which the positive meniscus glass lens L5 curved to the left and the negative meniscus glass lens L6 curved to the left are closely adhered, the radius R9 is (-30.04 to-30.05) mm, R10/R11 is (-19.63 to-19.64) mm, and the radius R12 is (-39.94 to-39.96) mm; the thickness t of L5 is (8.74-8.75) mm, and the thickness t of L6 is (1.94-1.95) mm; the refractive index n of L5 is (1.57-1.59), preferably 1.589; the refractive index n of L6 is (1.70-1.72), preferably 1.701; the air interval d is (0.18-0.19) mm;
the radius R13 of the meniscus glass positive lens L7 bent to the left is (-110.39-110.395) mm, and the radius R14 is (-52.623-52.628) mm; the thickness t ranges from (6.15 to 6.16) mm; the refractive index n ranges from (1.80 to 1.85), preferably 1.804; the air interval d is in the range of (105.29-105.31) mm;
the surface R15 of the Fresnel lens is a plane, and the radius R16 of the Fresnel surface is (-66.63-66.635) mm; the thickness t ranges from (1.8 to 1.805) mm; the refractive index n ranges from (1.49 to 1.50), preferably 1.4918; the air interval d ranges from (9.04-9.05) mm.
The heavy lanthanum flint glass adopted by the second lens and the seventh lens has excellent crystallization resistance and low refractive index temperature coefficient (below 2.4X10-6/DEGC), and can effectively reduce thermal aberration caused by temperature difference, thereby realizing athermalization design. The cemented lens consisting of the positive focal power fifth lens and the negative focal power sixth lens is formed by adopting dense crown glass with the refractive index between 1.57 and 1.59 and heavy barium flint glass with the refractive index between 1.70 and 1.72, so that the spherical aberration and chromatic aberration of the system are eliminated, the light energy loss of the system is reduced, and the imaging quality and brightness are improved.
Fig. 3 is a graph of MTF (modulation transfer function) for an embodiment of the present utility model, in which the abscissa represents spatial frequency in units: line pair/millimeter (lp/mm), the ordinate indicates the MTF value; as can be seen from the graph, the MTF curve concentration of the embodiment is relatively high, which indicates that the imaging consistency of the whole image surface is excellent in the technical scheme of the embodiment, and the high-definition image can be obtained on the whole image surface. Fig. 4 is a graph of field curvature/distortion effect according to an embodiment of the present utility model, wherein the abscissa represents the distortion percentage, and the ordinate represents the field of view range, and as can be seen from fig. 4, the distortion in the entire image plane is below 0.5%.
According to the utility model, through the combination of the selection of the optical glass materials and the matching of different curvature radiuses, the design of the 5inch LCD lens is realized, the effective focal length F' =137.36 mm of the system, the relative aperture number F/# =3.0, the projection ratio of the system is 1.2, the total length of the optical system is smaller than 90mm, the projection size range is 40-150 inch, the projection picture is 3840 x 2160 pixel resolution, and the 4K high-definition imaging effect is achieved.
Claims (5)
1. A4K high-definition LCD projection lens is characterized by comprising an optical system lens group consisting of 6 groups of 7 lenses, wherein the optical system lens group sequentially comprises a meniscus negative focal power first lens bent right, a meniscus positive focal power second lens bent right, a meniscus negative focal power third lens bent right, a biconvex positive focal power fourth lens, a cementing lens formed by a meniscus positive focal power fifth lens bent left and a meniscus negative focal power sixth lens bent left, a meniscus positive focal power seventh lens bent left, a Fresnel lens and an LCD liquid crystal display screen along the incidence direction of light rays from left to right, and a diaphragm is positioned between the fourth lens and the cementing lens.
2. The 4K high-definition LCD projection lens according to claim 1, wherein the focal length of the 4K high-definition LCD projection lens is defined as f ', the back focal length is defined as lf', the focal length of the first lens is defined as f '1, the focal length of the second lens is defined as f'2, the focal length of the third lens is defined as f '3, the focal length of the fourth lens is defined as f'4, the focal length of the cemented lens comprising the fifth lens and the sixth lens is defined as f '56, and the focal length of the seventh lens is defined as f'7, then:
the focal length f 'and the back focal length lf' satisfy the relation |lf '/f' | < 0.05;
the focal length f '1 of the first lens and the focal length f' of the lens satisfy the relation
0.5＜∣f’1/f’∣＜0.82；
The focal length f '2 of the second lens and the focal length f' of the lens satisfy the relation
0＜∣f’2/f’∣＜0.4；
The focal length f '3 of the third lens and the focal length f' of the lens satisfy the relation
0.5＜∣f’3/f’∣＜0.55；
The focal length f '4 of the fourth lens and the focal length f' of the lens satisfy the relation
1＜∣f’4/f’∣＜1.2；
The focal length f '56 of the cemented lens formed by the fifth lens and the sixth lens and the focal length f' of the lens satisfy the relation 1 < |f '56/f' | < 1.22;
the focal length f '7 of the seventh lens and the focal length f' of the lens satisfy the relation
0.7＜∣f’7/f’∣＜0.87。
3. The 4K high definition LCD projection lens according to claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all spherical glass lenses, wherein the first lens is barium crown glass, the second lens and the seventh lens are heavy lanthanum flint glass, the third lens is heavy flint glass, the fourth lens is crown glass, the fifth lens is heavy crown glass, and the sixth lens is heavy barium flint glass.
4. The 4K high definition LCD projection lens of claim 1, wherein the 7 lens has a bending radius defined by a left bending sign "-", a right bending sign "+", a lens thickness t, a refractive index n, and an air gap d:
5. the 4K high definition LCD projection lens of claim 4, wherein the first lens refractive index is 1.568, the second lens refractive index and the seventh lens refractive index are 1.804, the third lens refractive index is 1.717, the fourth lens refractive index is 1.516, the fifth lens refractive index is 1.589, and the sixth lens refractive index is 1.701.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322002869.7U CN220509204U (en) | 2023-07-28 | 2023-07-28 | 4K high definition LCD projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322002869.7U CN220509204U (en) | 2023-07-28 | 2023-07-28 | 4K high definition LCD projection lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220509204U true CN220509204U (en) | 2024-02-20 |
Family
ID=89870855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322002869.7U Active CN220509204U (en) | 2023-07-28 | 2023-07-28 | 4K high definition LCD projection lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220509204U (en) |
-
2023
- 2023-07-28 CN CN202322002869.7U patent/CN220509204U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107422458B (en) | L-shaped short-focus full-high-definition projection lens with low F number | |
| CN103777314A (en) | Wide-angle projection lens | |
| KR20050107521A (en) | Low element count projection lenses for use with pixelized panels | |
| US11480782B1 (en) | Reflective eyepiece optical system and head-mounted near-to-eye display device | |
| WO2020168817A1 (en) | Optical system and near-eye display device | |
| US11768382B2 (en) | Reflective eyepiece optical system and head-mounted near-to-eye display device | |
| CN112987264A (en) | Ultra-short-focus projection lens with large view field and high brightness | |
| CN220509204U (en) | 4K high definition LCD projection lens | |
| WO2022141133A1 (en) | Catadioptric eyepiece optical system and head-mounted display device | |
| CN220820352U (en) | 4K high definition light valve lens | |
| CN115421300A (en) | Optical module and head-mounted display equipment | |
| CN110673306B (en) | Small-size full high definition short-focus projection lens | |
| CN209979996U (en) | Off-axis ultra-short-focus projection lens | |
| CN100432736C (en) | 90-degree turning rear-projection object lens | |
| JP2002006298A (en) | Projection color picture display device | |
| US11536977B1 (en) | Reflective eyepiece optical system and head-mounted near-to-eye display device | |
| US20230044295A1 (en) | Reflective eyepiece optical system and head-mounted near-to-eye display device | |
| WO2023092419A1 (en) | Optical system and virtual reality device | |
| CN221039594U (en) | 4K high-definition imaging system | |
| CN218332132U (en) | Miniature projector and near-to-eye display equipment | |
| US11994667B1 (en) | Eyepiece optical assembly, system and device | |
| CN101581823B (en) | Camera lens for projector | |
| WO2023143008A1 (en) | Projection lens, projection device, and vehicle | |
| US11579434B1 (en) | Reflective eyepiece optical system and head-mounted near-to-eye display device | |
| US11762187B2 (en) | Reflective eyepiece optical system and head-mounted near-to-eye display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |