CN111580247B - Integrally-focusing high-definition micro-projection lens - Google Patents
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- CN111580247B CN111580247B CN202010615813.7A CN202010615813A CN111580247B CN 111580247 B CN111580247 B CN 111580247B CN 202010615813 A CN202010615813 A CN 202010615813A CN 111580247 B CN111580247 B CN 111580247B
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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
- 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
- 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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- 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
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
Abstract
The invention discloses an integrally-focusing high-definition micro-projection lens, which belongs to the technical field of optical lenses and comprises an even aspheric lens, a first crescent lens, a biconcave negative lens, a first biconvex lens, a second biconvex lens, a first achromatic lens group, a second achromatic lens group and a dioptric lens group which are sequentially arranged from left to right along the light direction, wherein the first achromatic lens group comprises a second crescent lens and a first biconvex lens, the second achromatic lens group comprises a biconcave lens and a second biconvex lens, and the dioptric lens group comprises a third biconvex lens and a fourth biconvex lens. The micro-projection lens has the advantages of high resolution, good imaging quality, large projection coverage, strong performance stability and low cost.
Description
Technical Field
The invention relates to the technical field of optical lenses, in particular to an integrally-focusing high-definition micro-projection lens.
Background
With the social development, a micro projector adopting the DLP projection technology appears, and a high requirement is put forward on the performance of a projection lens. The transmittance of the existing projection lens is generally more than 1.0, the field angle is about 60 degrees, most lenses use fewer lenses for pursuing compact structure, and when higher imaging quality is required, the correction of pixels is not ideal, so that the existing micro projection lens cannot project large-size pictures within a limited distance, has a smaller field angle, and cannot project finer pictures; moreover, the DLP micro projector in the market is usually used as a screen-less television, which has higher requirements for the definition and the fineness of the product, and the requirement for the projection lens is further increased due to the reduction of the size (5.4 um) of the micromirror, and especially for the projection lens, in order to ensure the stable performance of the assembly efficiency and the product, the traditional method adopts the method that the product performance and the assembly efficiency of the lens are ensured by increasing the design requirements and the processing requirements of tight parts. 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 with publication number CN 209311771U discloses a micro projection lens, which includes a first group lens with positive focal length, a diaphragm, a second group lens with positive focal length, a beam splitter, a protective glass and an imaging plane; the first group of lenses has a focal length of 17.2 < f12<27, and the second group of lenses has a focal length of 102.6< f13< 111.8. The patent discloses a miniature projection lens, can effectual solution current miniature projection lens can not throw the jumbo size picture in the finite distance, be difficult for the equipment, imaging quality is not high and projection lens easily runs the technical problem burnt. However, the micro projection lens disclosed in this patent cannot project a large-sized screen, has a small angle of view, and has low resolution.
Publication number is CN 109633868A's patent document discloses a well burnt high definition throws projecting lens a little, belongs to optical lens technical field, and this well burnt high definition throws projecting lens a little and has set gradually aspherical lens, negative meniscus lens, biconcave negative lens, focus group, achromatism lens assembly and dioptric lens group from left to right along the light direction, focus group is including biconvex positive lens and biconcave negative lens group, achromatism lens group is including biconcave lens group and biconvex lens group, dioptric lens group is including first biconvex lens and second biconvex lens. The high-definition medium-focus 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. However, the intermediate-focus high-definition micro-projection lens disclosed in the patent document uses a large number of lenses, which increases the cost and reduces the assembly efficiency.
Disclosure of Invention
In view of the above, the present invention provides an overall focusing high definition micro-projection lens with high resolution, good imaging quality, large projection coverage, strong performance stability and low cost, which is provided for overcoming the defects of the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides an overall focusing high definition throws projecting lens a little, includes even order aspherical lens, first crescent lens, biconcave negative lens, first biconvex lens, second biconvex lens, first achromat lens group, second achromat lens group and dioptric lens group that set gradually from left to right along the light direction.
Further, the first achromatic lens group includes a second meniscus lens and a first biconvex lens, and the second achromatic lens group includes a biconcave lens and a second biconvex lens.
Further, the diopter lens group comprises a third biconvex lens and a fourth biconvex lens.
Further, the overall focusing high-definition micro-projection lens realizes the image definition from 40 inches to 120 inches through overall back focus adjustment.
Further, the effective focal length of the integrally-focusing high-definition micro-projection lens is 12.59mm, and the aperture value of the lens is F1.7.
Furthermore, the overall focusing high-definition micro-projection lens has the image resolution of 100lp/mm in the central resolution and 93lp/mm in the peripheral resolution under a projection picture of 40 inches to 120 inches.
Further, the throw ratio of the integrally-focusing high-definition micro-projection lens is 1.2.
Furthermore, the even-order aspheric lens is made of plastic, and the first crescent lens, the biconcave negative lens, the first biconvex lens, the second biconvex lens, the first achromatic lens group, the second achromatic lens group and the dioptric lens group are made of glass.
Due to the rapid development of DLP projection technology, such as screen-less television, the development of projection lenses is also increasing rapidly, to replace the conventional tv screen with new technology, the skilled person first thinks that, high definition imaging and projection surfaces are large, so as to overcome the defects of large volume, inconvenient movement, easy damage, large screen and high cost of the traditional television, the high imaging definition depends on the number of lenses, the optical path is increased under the same condition, the high imaging quality can be naturally ensured on a large projection surface, for example, patent document CN 103631006A discloses a large zoom ratio continuous zoom projection lens, the optical system lens comprises a focusing group, a zooming group, a first compensation group, a second compensation group and a rear fixing group, which are arranged in order from the screen side to the image plane side along the optical axis, and a diaphragm is located on the second compensation group. The focusing is realized by moving the focusing group back and forth, and the zooming is realized by moving the zoom group, the first compensation group and the second compensation group in the same direction along the optical axis from the wide-angle end to the telephoto end, in the zooming process, a projection picture is always clear, the total distance from the first surface of the lens to the image surface is kept unchanged, all lenses in the lens are made of glass with high domestic use frequency, and are all spherical lenses, so the cost is low, the manufacturability is good, the mass production is adapted, and the method can be widely applied to the field of micro-projection; still like a middle jiao high definition projection lens that patent document publication No. CN 109633868A discloses, belong to optical lens technical field, this middle jiao high definition projection lens that throws a little has set gradually aspherical lens, negative meniscus lens, biconcave negative lens, focus group, achromatism battery 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 includes biconcave battery and biconvex battery, dioptric lens group includes first biconvex lens and 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.
The two existing micro-projection lenses achieve the large projection surface high-definition effect, and up to 12 lenses are adopted, so that the prior art can easily think that a plurality of lenses are mutually matched to form a system light path, high-definition projection can be realized, the number of the lenses is reduced, the imaging quality is easily reduced, and therefore, in order to ensure the imaging effect, the technical personnel in the field can easily think that the product performance of the lenses is ensured by improving the design requirements and tightening the part processing requirements on the basis of the plurality of lenses, rather than reducing the lenses by reversing the way.
This trade personnel know, in order to practice thrift the cost and reduce the equipment procedure, the material that uses is the better less, just realize the high definition in view of above two kinds of little projection lens all adopt 12 lenses, big plane of throwing, this trade personnel only can realize the little projection lens of at least 12 lenses, a plurality of lens interact, form stable light path, just can realize satisfying the effect of the big plane of throwing of high definition, if remove one or several of them wantonly, the influence to the light path is huge, seriously influence the imaging quality, therefore, when satisfying the high-definition formation of image of big plane of throwing, reduce the quantity of lens, it is difficult to realize to technical staff in the field.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an integrally-focusing high-definition micro-projection lens, which is sequentially provided with an even aspheric lens, a first crescent lens, a biconcave negative lens, a first biconvex lens, a second biconvex lens, a first achromatic lens group, a second achromatic lens group and a dioptric lens group from left to right along the light direction. The high-definition micro-projection lens is combined by 11 lenses, the number of different lenses and the arrangement of the lenses are optimized, the upper even-order aspheric lens is made of plastic materials, the other aspheric lenses are made of glass materials, the high-definition micro-projection lens is good in optical performance and imaging quality, and the projection size is from a small picture to a large picture.
The invention provides an integrally-focusing high-definition micro-projection lens, which can obtain the image resolving power of the high-definition micro-projection lens under a 40-inch to 120-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 coverage is from a small picture to a large picture, the performance stability is high, and the requirement of a 0.47DMD (digital micromirror device) chip can be met.
Drawings
FIG. 1 is a 2D diagram of an optical system of the present invention;
FIG. 2 is a 2D view of the optical system of the present invention;
FIG. 3 is a graph of MTF for a 80 inch projection of the lens of the present invention;
FIG. 4 is a graph of MTF for a 120 inch projection of the lens of the present invention;
FIG. 5 is a graph of MTF for a 40 inch projection of the lens of the present invention;
FIG. 6 is a diagram of standard light spots for a lens projection of 80 inches according to the present invention;
the lens comprises a 1-even aspheric lens, a 2-first crescent lens, a 3-biconcave negative lens, a 4-first biconvex lens, a 5-second biconvex lens, a 6-second crescent lens, a 7-first biconvex lens, an 8-biconcave lens, a 9-second biconvex lens, a 10-third biconvex lens and a 11-fourth biconvex lens.
Detailed Description
In order to better understand the present invention, the following examples are further provided to clearly illustrate the contents of the present invention, but the contents of the present invention are not limited to the following examples. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details.
Example one
As shown in fig. 1-2, an integrally focusing high-definition micro-projection lens includes an even aspheric lens 1, a first meniscus lens 2, a biconcave negative lens 3, a first biconvex lens 4, a second biconvex lens 5, a first achromatic lens group, a second achromatic lens group and a dioptric lens group, which are sequentially arranged from left to right along a light direction.
The first achromatic lens group includes a second meniscus lens 6 and a first biconvex lens 7, and the second achromatic lens group includes a biconcave lens 8 and a second biconvex lens 9.
The dioptric lens group includes a third biconvex lens 10 and a fourth biconvex lens 11.
The integral focusing high-definition micro-projection lens realizes the definition of a picture from 40 inches to 120 inches through integral back focus adjustment.
The overall focusing high-definition micro-projection lens has the image resolution of 100lp/mm and the peripheral resolution of 93lp/mm under a projection picture of 40 inches to 120 inches.
The integrally-focusing high-definition micro-projection lens provided by the embodiment of the invention adopts an 11-lens optical system structure, and compared with the existing micro-projection lens with the same resolution, the lens adopted is less, the cost is reduced, the assembly efficiency is improved, the high resolution, the good imaging quality, the large projection coverage and the strong performance stability can be ensured.
Example two
As shown in fig. 1 to 6, an integrally focusing high definition micro-projection lens includes an even aspheric lens 1, a first meniscus lens 2, a biconcave negative lens 3, a first biconvex lens 4, a second biconvex lens 5, a first achromatic lens group, a second achromatic lens group and a dioptric lens group, which are sequentially arranged from left to right along a light direction.
The first achromatic lens group includes a second meniscus lens 6 and a first biconvex lens 7, and the second achromatic lens group includes a biconcave lens 8 and a second biconvex lens 9.
The dioptric lens group includes a third biconvex lens 10 and a fourth biconvex lens 11.
The integral focusing high-definition micro-projection lens realizes the definition of a picture from 40 inches to 120 inches through integral back focus adjustment.
The overall focusing high-definition micro-projection lens has the image resolution of 100lp/mm and the peripheral resolution of 93lp/mm under a projection picture of 40 inches to 120 inches.
The integrally focusing high-definition micro-projection lens provided by the embodiment of the invention is different from the first embodiment in that:
the effective focal length of the integrally-focusing high-definition micro-projection lens is 12.59mm, and the aperture value of the lens is F1.7.
The projection ratio of the integrally-focusing high-definition micro-projection lens is 1.2, and the integrally-focusing high-definition micro-projection lens has a projection size covering from a small picture to a large picture and high definition.
To meet the above performance parameters, the following description is further made on the structural parameters of each surface of 11 lenses, and the structural parameters of the lens from left to right are shown in table 1:
table 1: structural parameters of each lens
An aspherical surface expression:
aspherical surface coefficient:
the overall focusing high-definition micro-projection lens provided by the embodiment of the invention is analyzed after MTF analysis if the following steps are carried out: the MTF curve for a projected picture of 80 inches is shown in fig. 3, the MTF curve for a projected picture of 120 inches is shown in fig. 4, the MTF curve for a projected picture of 40 inches is shown in fig. 5, and the standard flare map for a projected picture of 80 inches is shown in fig. 6.
As can be seen from fig. 3 to 5, in the 40-120 inch projection image, the contrast and the resolution of the projection lens at the maximum aperture F1.7 are good at the center, but slightly decrease at the edge, the resolution is relatively average, but slightly attenuate at the edge, the whole is smooth, and the focusing imaging stability is good.
As can be seen from fig. 6, the projected image is a standard speckle pattern when the projected image is 80 inches, in which the scattered spot is small, the imaging effect is good, the optical system is stable, and the actual processing can be performed.
EXAMPLE III
As shown in fig. 1 to 6, an integrally focusing high-definition micro-projection lens comprises an even aspheric lens 1, a first crescent lens 2, a biconcave negative lens 3, a first biconvex lens 4, a second biconvex lens 5, a first achromatic lens group, a second achromatic lens group and a dioptric lens group which are sequentially arranged from left to right along the light direction.
The first achromatic lens group includes a second meniscus lens 6 and a first biconvex lens 7, and the second achromatic lens group includes a biconcave lens 8 and a second biconvex lens 9.
The dioptric lens group includes a third biconvex lens 10 and a fourth biconvex lens 11.
The integral focusing high-definition micro-projection lens realizes the image definition from 40 inches to 120 inches through integral back focus adjustment.
The overall focusing high-definition micro-projection lens has the image resolution of 100lp/mm and the peripheral resolution of 93lp/mm under a projection picture of 40 inches to 120 inches.
The effective focal length of the integrally-focusing high-definition micro-projection lens is 12.59mm, and the aperture value of the lens is F1.7.
The projection ratio of the integrally-focusing high-definition micro-projection lens is 1.2, and the integrally-focusing high-definition micro-projection lens has a projection size covering from a small picture to a large picture and high definition.
Compared with the first embodiment and the second embodiment, the integrally focusing high-definition micro-projection lens provided by the embodiment of the invention has the following differences: the material of the even-order aspheric lens is a plastic material, and the material of the first crescent lens, the biconcave negative lens, the first biconvex lens, the second biconvex lens, the first achromatic lens group, the second achromatic lens group and the dioptric lens group is glass material.
The integrally-focusing high-definition micro-projection lens provided by the embodiment of the invention is combined by 11 lenses, the number of different lenses and the arrangement optimization of the lenses are realized, the upper even-order aspheric lens selected as the lens optical material is made of a plastic material, and the other lenses are made of glass materials.
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 (2)
1. The utility model provides an wholly focusing high definition throws projection lens a little which characterized in that: the optical lens comprises an even aspheric lens, a first crescent lens, a biconcave negative lens, a first biconvex lens, a second biconvex lens, a first achromatic lens group, a second achromatic lens group and a dioptric lens group which are sequentially arranged from left to right along the light direction; the first achromatic lens group including a second meniscus lens and a first biconvex lens, the second achromatic lens group including a biconcave lens and a second biconvex lens, the diopter lens group including a third biconvex lens and a fourth biconvex lens;
the lens surface parameters of the 11 lenses from left to right are as follows:
the aspheric surface coefficient and the aspheric surface expression of the even-order aspheric surface lens are as follows:
aspherical surface coefficient:
An aspherical surface expression:
the integral focusing high-definition micro-projection lens realizes the definition of a picture from 40 inches to 120 inches through integral back focus adjustment, and the integral focusing high-definition micro-projection lens has image resolution under the projection picture from 40 inches to 120 inches: the central resolution is 100lp/mm, and the peripheral resolution is 93 lp/mm; the effective focal length of the integrally-focusing high-definition micro-projection lens is 12.59mm, and the aperture value of the lens is F1.7; the throw ratio of the integrally-focusing high-definition micro-projection lens is 1.2.
2. The integrally focusing high definition micro-projection lens of claim 1, wherein: the material of the even-order aspheric lens is a plastic material, and the material of the first crescent lens, the biconcave negative lens, the first biconvex lens, the second biconvex lens, the first achromatic lens group, the second achromatic lens group and the dioptric lens group is glass material.
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| CN111856848B (en) * | 2020-08-31 | 2021-11-26 | 南阳南方智能光电有限公司 | Micro-projection lens for 0.23-inch chip |
| CN113917670B (en) * | 2021-09-23 | 2023-06-20 | 江苏宇迪光学股份有限公司 | High-resolution ultrashort-focus projection lens |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590985A (en) * | 2011-11-15 | 2012-07-18 | 深圳市亿思达显示科技有限公司 | High-resolution wide-angle projection lens and projector |
| CN103631006A (en) * | 2012-12-28 | 2014-03-12 | 利达光电股份有限公司 | Large zoom ratio continuous zooming projection lens |
| EP2765446A1 (en) * | 2013-01-08 | 2014-08-13 | Canon Kabushiki Kaisha | Optical system and image projection apparatus including the same |
| CN106154506A (en) * | 2015-03-30 | 2016-11-23 | 鸿富锦精密工业（深圳）有限公司 | Projection lens |
| CN109633868A (en) * | 2019-02-19 | 2019-04-16 | 南阳南方智能光电有限公司 | The micro- throwing projection lens of burnt high definition in one kind |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590985A (en) * | 2011-11-15 | 2012-07-18 | 深圳市亿思达显示科技有限公司 | High-resolution wide-angle projection lens and projector |
| CN103631006A (en) * | 2012-12-28 | 2014-03-12 | 利达光电股份有限公司 | Large zoom ratio continuous zooming projection lens |
| EP2765446A1 (en) * | 2013-01-08 | 2014-08-13 | Canon Kabushiki Kaisha | Optical system and image projection apparatus including the same |
| CN106154506A (en) * | 2015-03-30 | 2016-11-23 | 鸿富锦精密工业（深圳）有限公司 | Projection lens |
| CN109633868A (en) * | 2019-02-19 | 2019-04-16 | 南阳南方智能光电有限公司 | The micro- throwing projection lens of burnt high definition in one kind |
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