CN114236789A - High-definition micro-projection lens - Google Patents
High-definition micro-projection lens Download PDFInfo
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- CN114236789A CN114236789A CN202111525144.5A CN202111525144A CN114236789A CN 114236789 A CN114236789 A CN 114236789A CN 202111525144 A CN202111525144 A CN 202111525144A CN 114236789 A CN114236789 A CN 114236789A
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- positive lens
- lens
- lens group
- biconvex
- negative lens
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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
-
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a high-definition micro-projection lens which sequentially comprises a positive lens group A, a diaphragm B and a positive lens group C from an object side to an image side, wherein the focal length of the positive lens group A is fA and consists of a rightward bent meniscus negative lens A1 and a biconvex positive lens A2, and the focal length of the positive lens group C is fC and consists of a biconcave negative lens C1, a biconvex positive lens C2, a leftward bent meniscus negative lens C3 and a biconvex positive lens C4. The invention has the advantages of low cost, clear imaging and stable image quality, and effectively improves the application and experience of users.
Description
Technical Field
The invention belongs to the technical field of projection lenses, and particularly relates to a high-definition micro-projection lens.
Background
Over the years of development, the development of miniature projectors is now beginning to enter the maturity stage. People pay attention to the application experience of products, and the micro projector has the current development trend that the functions are more and more abundant and the price is more favorable. Thanks to the trend of high-definition and full-high-definition of multimedia content, the dominance of consumer customers on the resolution of projection products is also increasing, and high-resolution products are more and more popular in LED projection. The performance of the projection lens, which is an important component of a projection product, directly affects the display effect of the projection product.
In the prior art, the micro-projector is automatically out of focus after being used for a period of time due to heat, that is, although the focus is adjusted at the beginning, the lens must be focused again after watching a movie. In order to solve the problem of lens out-of-focus, some add an automatic focusing function, find the position of the movable lens corresponding to the highest value of definition in the moving range by moving the movable lens, and control the movable lens to fall on the position of the highest value of definition in the moving range to realize focusing again; some are refocused by a global or local structure. But with a consequent increase in cost and a reduction in the user's experience of the application.
In the prior art, because the imaging quality of the working temperature range of the projection lens is not properly optimized in the structure of an optical system, the imaging cannot be always kept clear when the projection lens works in the temperature fluctuation range of-20-60 ℃, the image quality is stable, and a user needs to manually or electrically adjust the lens to focus in the use process, so that the use experience of the user is influenced. Therefore, the present invention is based on the deficiencies of the conventional design techniques.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a high-definition micro-projection lens which can meet the requirements of an imaging size of an imaging circle with the diameter of phi 8mm, a 1920 x 1080 pixel resolution ratio, and working lens focal length within an environment range from low temperature of-20 ℃ to high temperature of +60 ℃ without defocusing, and can meet the requirement of unchanged imaging definition without refocusing.
In order to achieve the design purpose, the technical scheme adopted by the invention is as follows: the utility model provides a little projection lens of high definition, from the object space to the image space, includes positive lens group A, diaphragm B and positive lens group C in proper order, positive lens group A focus is fA, comprises meniscus negative lens A1 and the positive lens of biconvex A2 of bending right, positive lens group C focus is fC, comprises biconcave negative lens C1 and the positive lens of biconvex C2, the meniscus negative lens C3 and the positive lens of biconvex C4 of bending left.
The biconcave negative lens C1, the biconvex positive lens C2 and the left-curved meniscus negative lens C3 are sealed and cemented into a negative lens group.
The diaphragm is arranged behind the biconvex positive lens A2, and the following conditions are satisfied between the focal lengths of the positive lens group A and the positive lens group C: fA/fC is more than 2.1 and less than 2.2.
The right-curved meniscus negative lens A1 and the biconvex positive lens C4 are both made of glass, and two radius surfaces of the two lenses are both designed to be even aspheric shapes.
The invention has the beneficial effects that: compared with the prior art, the first even-order aspheric lens 1 and the second even-order aspheric lens 2 are both made of plastic materials, so that the phenomenon of thermal defocusing exists, a user needs to manually or electrically adjust the lens to focus in the using process, and the structural scheme in the invention can meet the requirements of imaging size of an imaging circle phi 8mm, resolution of 1920 x 1080 pixels, no defocusing of the focal length of the lens in the working environment range from low temperature of minus 20 ℃ to high temperature of plus 60 ℃, and imaging definition can be met without focusing again. The invention has the advantages of low cost, clear imaging and stable image quality, and effectively improves the application and experience of users.
Drawings
FIG. 1 is a schematic view of the arrangement of the optical glass with light according to the present invention;
FIG. 2 is a schematic view of the arrangement of the optical glass of the present invention without light rays;
FIG. 3 is a graph of the MTF (modulation transfer function, reflecting lens resolution) at-20 ℃ of the present invention;
FIG. 4 is a graph of MTF (modulation transfer function, reflecting lens resolution) at +20 ℃ in accordance with the present invention;
fig. 5 is a graph of MTF (modulation transfer function, reflecting lens resolution) at +60 ℃ in accordance with the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. As shown in fig. 1-5: the utility model provides a little projection lens of high definition, from the object space to the image space, includes positive lens group A, diaphragm B and positive lens group C in proper order, positive lens group A focus is fA, comprises meniscus negative lens A1 and the positive lens of biconvex A2 of bending right, positive lens group C focus is fC, comprises biconcave negative lens C1 and the positive lens of biconvex C2, the meniscus negative lens C3 and the positive lens of biconvex C4 of bending left.
The biconcave negative lens C1, the biconvex positive lens C2 and the left-curved meniscus negative lens C3 are sealed and cemented into a negative lens group.
The diaphragm is arranged behind the biconvex positive lens A2, and the following conditions are satisfied between the focal lengths of the positive lens group A and the positive lens group C: fA/fC is more than 2.1 and less than 2.2.
The right-curved meniscus negative lens A1 and the biconvex positive lens C4 are both made of glass, and two radius surfaces of the two lenses are both designed to be even aspheric shapes.
In fig. 1, No. 1 is a rightward curved meniscus negative lens a1, No. 2 is a biconvex positive lens a2, No. 3 is a stop B, No. 4 is a biconcave negative lens C1, No. 5 is a biconvex positive lens C2, No. 6 is a leftward curved meniscus negative lens C3, and No. 7 is a biconvex positive lens C4.
The performance parameters to be achieved by the present invention are: effective focal length F ″ =6.25mm, aperture value F1.7, back focal length is 12.3mm, total length of an optical system is smaller than 47mm, resolution is 1920 x 1080 pixels, the focal length of a working lens in an environment range from low temperature of minus 20 ℃ to high temperature of plus 60 ℃ is not defocused, and the high-definition micro-projection lens effect with unchanged imaging definition can be met without focusing again.
In order to meet the requirements of the performance parameters, referring to fig. 2, the configuration of the bending radius R (left bending symbol is "-", right bending symbol is "+") of the 6-piece lens, the lens thickness t, the refractive index n, and the air gap d meets the following requirements:
in fig. 2, from left to right: the radius R1 of the rightward curved meniscus negative lens a1 is +11.2mm, and R2 is +3.75 mm; the thickness t is 1.22 mm; the refractive index n is 1.4971; the air gap d ranges from 9.6 mm.
The radius R3 of the biconvex positive lens A2 is +14.33mm, and R4 is-380.2 mm; the thickness t is 2.0 mm; the refractive index n is 2.0007; the air gap d is 1.82 mm.
Diaphragm B, air gap d is 2.12 mm.
In the cemented negative lens group formed by tightly connecting the biconcave negative lens C1, the biconvex positive lens C2 and the left-curved meniscus negative lens C3, the radius R5 is-13.63 mm, the radius R6/R7 is +6.04mm, the radius R8/9 is-6.04 mm, and the radius R10 is-10.74 mm; the thickness t of the C1 is 0.85mm, the thickness t of the C2 is 5.2mm, and the thickness t of the C3 is 2.16 mm; the C1 refractive index n is 1.9037, the C2 refractive index n is 1.6935; c3 has a refractive index n of 1.9037; the air gap d is 0.1 mm.
The radius R11 of the biconvex positive lens C4 is +19.75mm, and R12 is-9.14 mm; the thickness t is 4.7 mm; the refractive index n is 1.4971; the air gap d ranges from 12.3 mm.
The rise standard equation for an even aspheric surface is:
in the equation, c is the curvature (reciprocal of radius R), h is the radial coordinate in units of lens length, and k is the conic coefficient. The conic coefficients are less than-1 for hyperbolic curves, -1 for parabolas, -1 to 0 for ellipses, and 0 for spheres. A1-A6 respectively represent coefficients corresponding to each radial coordinate;
the two radius surfaces R1 and R2 of the right-curved meniscus negative lens a1 are even aspheric surfaces, and the corresponding parameters are as follows in table 1:
the two radius surfaces R11 and R12 of the biconvex positive lens C4 are even aspheric surfaces, and the corresponding parameters are as follows in the following table 2:
Claims (4)
1. the utility model provides a little projection lens of high definition which characterized in that: from the object space to the image space, include positive lens group A, diaphragm B and positive lens group C in proper order, positive lens group A focus is fA, comprises the positive lens of right crooked crescent moon shape A1 and biconvex A2, positive lens group C focus is fC, comprises biconcave negative lens C1 and biconvex positive lens C2, the negative lens of left crooked crescent moon shape C3 and biconvex positive lens C4.
2. The high-definition micro-projection lens as claimed in claim 1, wherein: the biconcave negative lens C1, the biconvex positive lens C2 and the left-curved meniscus negative lens C3 are sealed and cemented into a negative lens group.
3. The high-definition micro-projection lens as claimed in claim 1, wherein: the diaphragm is arranged behind the biconvex positive lens A2, and the following conditions are satisfied between the focal lengths of the positive lens group A and the positive lens group C: fA/fC is more than 2.1 and less than 2.2.
4. The high-definition micro-projection lens as claimed in claim 1, wherein: the right-curved meniscus negative lens A1 and the biconvex positive lens C4 are both made of glass, and two radius surfaces of the two lenses are both designed to be even aspheric shapes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111525144.5A CN114236789B (en) | 2021-12-14 | 2021-12-14 | High-definition micro-projection lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111525144.5A CN114236789B (en) | 2021-12-14 | 2021-12-14 | High-definition micro-projection lens |
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| CN114236789A true CN114236789A (en) | 2022-03-25 |
| CN114236789B CN114236789B (en) | 2023-06-16 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407431A (en) * | 2014-12-05 | 2015-03-11 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN108363191A (en) * | 2017-01-26 | 2018-08-03 | 株式会社腾龙 | Imaging optical system and photographic device |
| CN110333592A (en) * | 2019-07-23 | 2019-10-15 | 福建福光天瞳光学有限公司 | A kind of small size optical system and its imaging method |
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2021
- 2021-12-14 CN CN202111525144.5A patent/CN114236789B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407431A (en) * | 2014-12-05 | 2015-03-11 | 宁波舜宇车载光学技术有限公司 | Optical lens |
| CN108363191A (en) * | 2017-01-26 | 2018-08-03 | 株式会社腾龙 | Imaging optical system and photographic device |
| CN110333592A (en) * | 2019-07-23 | 2019-10-15 | 福建福光天瞳光学有限公司 | A kind of small size optical system and its imaging method |
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| CN114236789B (en) | 2023-06-16 |
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