CN109633868B - Medium-focus high-definition micro-projection lens - Google Patents
Medium-focus high-definition micro-projection lens Download PDFInfo
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- CN109633868B CN109633868B CN201910123795.8A CN201910123795A CN109633868B CN 109633868 B CN109633868 B CN 109633868B CN 201910123795 A CN201910123795 A CN 201910123795A CN 109633868 B CN109633868 B CN 109633868B
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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
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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Abstract
The invention provides a middle-focus high-definition micro-projection lens, which belongs to the technical field of optical lenses and is sequentially provided with an aspheric lens, a negative meniscus lens, a biconcave negative lens, a focusing group, an achromatic lens group and a dioptric lens group from left to right along the light direction, wherein the focusing group comprises a biconvex positive lens and a biconcave negative lens group, the achromatic lens group comprises a biconcave lens group and a biconvex lens group, and the dioptric lens group comprises a first biconvex lens and a second biconvex lens. The medium-focus high-definition micro-projection lens is low in cost, the structure process adopts a fixed design form, the product assembly efficiency and the performance stability can be guaranteed, the resolution ratio is high, the manufacturability is good, and the large-scale production can be realized.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to a medium-focus high-definition micro-projection lens.
Background
With the social development, a screen-free television adopting a DLP projection technology and using an LED as a light source appears, at present, DLP miniature projectors on the market all use DMD chips with the TI of 0.33 inch and 0.47 inch and are used as screen-free televisions, the requirements on the definition, the fineness and the like of products need to be improved, and unfortunately, the visual perception of the current products for people cannot achieve the visual effect of the television. Due to the reduction of the size (5.4 um) of the micromirror, the requirement on the projection lens is further improved, and particularly for the projection lens, in order to ensure the stable assembly efficiency and the product performance, the traditional method adopts the mode of improving the design requirement and the tight part processing requirement to ensure the product performance and the assembly efficiency of the lens. These measures usually increase the product cost, and the large-scale production is very important for higher cost requirements, cost reduction and guarantee of assembly efficiency and product performance stability.
The patent publication No. CN 204287589U discloses a short-focus projection lens for a projector, which comprises an optical lens group, a prism and a chip, wherein the optical lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, the prism is located between the eighth lens and the chip, the sixth lens and the seventh lens are double-cemented lenses, the double-cemented lens is located between the fifth lens and the eighth lens, the seventh lens is located on one side of the eighth lens, the fourth lens is located between the third lens and the fifth lens, the first lens and the second lens are double-cemented lenses and are located in front of the third lens, the second lens is located on one side of the third lens, the projection lens includes fourteen surfaces, the third surface is an elliptic aspheric surface, and the fourteenth surface is an even-order aspheric surface. The lens has low resolution and insufficient resolution, and needs to be further optimized.
The document with the publication number of CN207380323U provides a short-focus high-definition projection lens, and relates to a projection lens. This camera lens has from left to right set gradually negative meniscus lens, aspherical lens, biconcave surface negative lens group, focus group, biconvex lens system field lens, aberration-eliminating lens group, dioptric lens group, biconcave surface negative lens group comprises 2 biconcave negative lenses, focus group comprises 2 biconcave negative lenses and 1 biconvex positive lens, dioptric lens group comprises 2 biconcave lenses and 1 biconvex lens, achromatic lens group comprises 2 biconcave lenses and 2 biconvex lenses, dioptric lens group comprises 1 biconvex lens and 1 biconvex lens, but this projection lens is effective than short, can not satisfy 0.47DMD chip's user demand.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a medium-focus high-definition micro-projection lens, which can reduce the cost of the projection lens and improve the assembly efficiency and the stability of the product performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a well burnt high definition throws projection lens a little, has set gradually aspherical lens, negative meniscus lens, biconcave negative lens, focus group, achromatism battery of lens and dioptric lens group from left to right along the light direction, focus group is including biconvex positive lens and biconcave negative lens group, the achromatism battery of lens is including biconcave battery of lens and biconvex battery of lens, dioptric lens group is including first biconvex lens and second biconvex lens.
Further, the double-concave negative lens group is composed of 2 double-concave negative lenses.
Further, the biconcave lens group is composed of a first biconcave lens and a second biconcave lens, and the biconvex lens group is composed of a third biconvex lens and a fourth biconvex lens.
Further, the effective focal length of the medium-focus high-definition micro-projection lens is 12.6mm, and the aperture value of the lens is F1.7.
Furthermore, the medium-focus high-definition micro-projection lens can realize the image resolution under a projection image of 30 inches to 150 inches, wherein the central resolution is 100lp/mm, and the peripheral resolution is 93 lp/mm.
Further, the projection ratio of the medium-focus high-definition micro-projection lens is 1.18.
Furthermore, the aspheric lens is made of plastic, and the negative meniscus lens, the biconcave negative lens, the focusing group, the achromatic lens group and the dioptric lens group are made of glass.
Furthermore, the middle-focus high-definition micro-projection lens is fixed through a rear frame and an F frame, and the rear frame and the F frame are fixed through a slide bar, a straight cylinder and a chute.
The invention has the beneficial effects that:
1. the invention provides a medium-focus high-definition micro-projection lens, which is combined by 12 lenses, and has the advantages of less number of used lenses, simple structural design, good optical performance, easy purchase and processing, good imaging quality and large projection size by continuously optimizing the number of different lenses, the arrangement of the lenses and the process structure, wherein the upper aspheric lens is selected as the optical material of the lens and is made of plastic material, and the other aspheric lenses are made of glass material.
2. The invention provides a middle-focus high-definition micro-projection lens which is fixed through a rear frame and an F frame, wherein the rear frame and the F frame are fixed through a slide bar, a straight cylinder and a chute, high-precision focusing is realized through the chute, the slide bar and the straight cylinder, and the structure process adopts a fixed design form, so that the assembly efficiency and the performance stability of a product can be ensured, the resolution ratio is high, the manufacturability is good, and the large-scale production can be realized.
3. The invention provides a middle-focus high-definition micro-projection lens, which can obtain the image resolving power of the middle-focus high-definition micro-projection lens under a 30-inch to 150-inch projection picture through an MTF (modulation transfer function) graph, wherein the central resolution is 100lp/mm, the peripheral resolution is 93lp/mm, the image resolving power is high, the resolution is high, the imaging quality is good, the projection size is large, the performance stability is strong, the cost of the projection lens can be reduced, and the requirement of a 0.47DMD (digital micromirror device) chip can be met.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a diagram of an optical system of the present invention;
FIG. 2 is a diagram of a structural process mounting form of the present invention;
FIG. 3 is a graph of MTF according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Example 1
As shown in fig. 1, a middle-focus high-definition micro-projection lens is sequentially provided with an aspheric lens 1, a negative meniscus lens 2, a biconcave negative lens 3, a focusing group, an achromatic lens group and a dioptric lens group from left to right along the light direction.
The focusing group comprises a biconvex positive lens 4 and a biconcave negative lens group 5, wherein: the double-concave negative lens group 5 is composed of two double-concave negative lenses, and the number of the double-concave negative lenses is 2.
The achromatic lens group includes a biconcave lens group and a biconvex lens group, wherein: the biconcave lens group is composed of a first biconcave lens 6 and a second biconcave lens 7, and the biconvex lens group is composed of a third biconvex lens 8 and a fourth biconvex lens 9.
The dioptric lens group includes a first biconvex lens 10 and a second biconvex lens 11. Wherein: the number of the first biconvex lens 10 and the second biconvex lens 11 is 1.
The medium-focus high-definition micro-projection lens adopts a 12-lens optical system structure, adopts few lenses and has lower cost.
Example 2
Example 2 differs from example 1 in that: the effective focal length of the medium-focus high-definition micro-projection lens is 12.6mm, and the aperture value of the lens is F1.7. The medium-focus high-definition micro-projection lens is easy to purchase and process and good in imaging quality.
The projection ratio of the medium-focus high-definition micro-projection lens is 1.18. The middle-focus high-definition micro-projection lens is large in projection size and high in projection brightness.
Wherein: the aspheric lens 1 is made of plastic, and the negative meniscus lens 2, the biconcave negative lens 3, the focusing group, the achromatic lens group and the dioptric lens group are made of glass. Most of lenses of the lens optical material are made of glass, so that the production cost of the medium-focus high-definition micro-projection lens is saved.
In order to meet the requirements of the performance parameters, the following description is made on the structural parameters of each surface of 12 lenses in the medium-focus high-definition micro-projection lens, where each lens has two surfaces, and the total surface is 24 surfaces, and the structural parameters of the lens from left to right are shown in table 1:
table 1: structural parameters of each lens
Example 3
As shown in fig. 2, embodiment 3 differs from embodiment 2 in that: a fixed frame of a middle-focus high-definition micro-projection lens is fixed through a rear frame 12 and an F frame 13, and the rear frame 12 and the F frame 13 are fixed through a slide bar 14, a straight cylinder 15 and a chute 16. The design form is fixed by using the structure process, so that the assembly efficiency and the performance stability of the product can be ensured, the resolution ratio is high, the manufacturability is good, and the large-scale production can be realized. In the design of the structure and process fixing form of the projection lens, high-precision focusing is realized through the chute 16, the slide bar 14 and the straight cylinder 15, and by adopting the structure, 12 lenses are fixed to keep the stability of the lenses, so that the high-precision focusing is realized more easily.
Example 4
As shown in fig. 3, embodiment 4 differs from embodiment 3 in that: the MTF graph has the abscissa of focal shift, the unit of mm, and the ordinate of the module value of the OTF, namely the MTF, which reflects the transfer capability of the system to frequency domain information, so that the imaging quality of the optical system can be objectively and comprehensively evaluated, and the resolving power of the medium-focus high-definition micro-projection lens under a projection picture of 30 inches to 150 inches can be obtained through the MTF graph, wherein the central resolution is 100lp/mm (flare <0.5pixels) and the peripheral resolution is 93lp/mm (flare <1.5 pixels). The medium-focus high-definition micro-projection lens is high in resolution, high in resolution and good in imaging quality, and can meet the requirement of a 0.47DMD chip.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. The utility model provides a well burnt high definition throws projection lens a little, includes aspherical lens (1), negative meniscus lens (2), biconcave negative lens (3), focus group, achromatism lens assembly and dioptric lens group, focus group includes biconvex positive lens (4) and biconcave negative lens group, biconcave negative lens group comprises biconcave negative lens (5), the number of biconcave negative lens (5) is 2, the achromatism lens assembly includes biconcave lens assembly and biconvex lens assembly, biconcave lens assembly comprises first biconcave lens (6) and second biconcave lens (7), biconvex lens assembly comprises third biconvex lens (8) and fourth biconvex lens (9), dioptric lens group includes first biconvex lens (10) and second biconvex lens (11), its characterized in that: aspheric lens (1), negative meniscus lens (2), biconcave negative lens (3), focusing group, achromatic lens group and dioptric lens group set gradually from left to right along the light direction, totally 12 lenses, 12 lenses are aspheric lens (1), negative meniscus lens (2), biconcave negative lens (3), biconvex positive lens (4), 2 biconcave negative lens (5), first biconcave lens (6), second biconcave lens (7), third biconvex lens (8), fourth biconvex lens (9), first biconvex lens (10) and second biconvex lens (11) from left to right along the light direction in proper order.
2. The medium-focus high-definition micro-projection lens as claimed in claim 1, wherein: the effective focal length of the medium-focus high-definition micro-projection lens is 12.6mm, and the aperture value of the lens is F1.7.
3. The medium-focus high-definition micro-projection lens as claimed in claim 1, wherein: the middle-focus high-definition micro-projection lens has the image resolution of 100lp/mm and the peripheral resolution of 93lp/mm under a projection picture of 30 inches to 150 inches.
4. The medium-focus high-definition micro-projection lens as claimed in claim 1, wherein: the projection ratio of the medium-focus high-definition micro-projection lens is 1.18.
5. The medium-focus high-definition micro-projection lens as claimed in claim 1, wherein: the material of aspheric surface lens (1) is the plastics material, negative meniscus lens (2) biconcave surface negative lens (3) focus group, achromatic lens group and dioptric lens group's material is the glass material.
6. The medium-focus high-definition micro-projection lens according to any one of claims 1 to 5, wherein: the middle-focus high-definition micro-projection lens is fixed through a rear frame (12) and an F frame (13), and the rear frame (12) and the F frame (13) are fixed through a slide bar (14), a straight cylinder (15) and an inclined groove (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910123795.8A CN109633868B (en) | 2019-02-19 | 2019-02-19 | Medium-focus high-definition micro-projection lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910123795.8A CN109633868B (en) | 2019-02-19 | 2019-02-19 | Medium-focus high-definition micro-projection lens |
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| Publication Number | Publication Date |
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| CN109633868A CN109633868A (en) | 2019-04-16 |
| CN109633868B true CN109633868B (en) | 2021-06-01 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580247B (en) * | 2020-07-01 | 2022-05-06 | 南阳南方智能光电有限公司 | Integrally-focusing high-definition micro-projection lens |
| CN111624836A (en) * | 2020-07-20 | 2020-09-04 | 南阳南方智能光电有限公司 | Standard micro-projection lens |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292698A (en) * | 1999-04-02 | 2000-10-20 | Canon Inc | Zoom lens |
| JP2002303790A (en) * | 2001-04-05 | 2002-10-18 | Mamiya Op Co Ltd | Retrofocus type very wideangle lens |
| CN2831163Y (en) * | 2005-10-31 | 2006-10-25 | 南阳利达光电有限公司 | Reflactive projecting lens of back projecting TV |
| CN206990887U (en) * | 2017-05-25 | 2018-02-09 | 杭州有人光电技术有限公司 | A kind of high definition projection lens |
| CN207380323U (en) * | 2017-09-27 | 2018-05-18 | 南阳南方智能光电有限公司 | Short focus high definition projection lens |
-
2019
- 2019-02-19 CN CN201910123795.8A patent/CN109633868B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292698A (en) * | 1999-04-02 | 2000-10-20 | Canon Inc | Zoom lens |
| JP2002303790A (en) * | 2001-04-05 | 2002-10-18 | Mamiya Op Co Ltd | Retrofocus type very wideangle lens |
| CN2831163Y (en) * | 2005-10-31 | 2006-10-25 | 南阳利达光电有限公司 | Reflactive projecting lens of back projecting TV |
| CN206990887U (en) * | 2017-05-25 | 2018-02-09 | 杭州有人光电技术有限公司 | A kind of high definition projection lens |
| CN207380323U (en) * | 2017-09-27 | 2018-05-18 | 南阳南方智能光电有限公司 | Short focus high definition projection lens |
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| CN109633868A (en) | 2019-04-16 |
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