CN112162368B - A free-form surface reflective coupling lens - Google Patents
A free-form surface reflective coupling lens Download PDFInfo
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- CN112162368B CN112162368B CN202011150104.2A CN202011150104A CN112162368B CN 112162368 B CN112162368 B CN 112162368B CN 202011150104 A CN202011150104 A CN 202011150104A CN 112162368 B CN112162368 B CN 112162368B
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- guide part
- light guide
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- lens
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- 230000008878 coupling Effects 0.000 title claims abstract description 36
- 238000010168 coupling process Methods 0.000 title claims abstract description 36
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 36
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/421—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical component consisting of a short length of fibre, e.g. fibre stub
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
A free-form surface reflective coupling lens relates to the technical field of coupling lenses. The technical defects of complex manufacturing process, high process requirement and high production cost of the traditional optical coupling lens framework are overcome, and the optical coupling lens framework comprises a first light guide part corresponding to a laser light source and a second light guide part corresponding to a light receiving module; a free curved surface part is arranged at the included angle of the optical axes of the first light guide part and the second light guide part; the deflection angle of the incident light of the principal ray of the first light guide part and the emergent light of the second light guide part on the free curved surface part is between 45+/-3 degrees; the laser light source led in by the first light guide part is reflected by the free curved surface part, forms converged light and then is emitted from the second transmission surface of the second light guide part. The lens surface is not required to be processed on the light incident side and the light emergent side of the lens respectively, and the structure is simple and is suitable for mass production. The free-form surface reflective lens is insensitive to the wavelength of the laser light source, the wavelength drift of the laser does not influence the coupling efficiency, and the coupling efficiency is high and the coupling efficiency is suitable for the laser light sources with different wavelengths.
Description
Technical Field
The invention relates to the field of optical elements, in particular to the technical field of coupling lenses.
Background
In the field of optical communication, an optical coupling lens is used between a laser light source and a light receiving module to realize optical coupling. As shown in fig. 1, the existing coupling lens is provided with a collimation and transmission surface 122 on the light incident side, and a focusing lens surface 121 on the light emergent side, the light emitted from the laser source is collimated and incident into the coupling lens through the collimation and transmission surface, and is directly focused to the light receiving module through the focusing lens surface, or is turned through a total reflection surface 114 and then emitted to the light receiving module through the focusing lens surface 121. For example: the application number is: CN2012103680474 discloses an optical coupling lens, which adopts the above-mentioned structure when optical coupling is performed. The structure needs to process the lens surface in two perpendicular directions respectively, and has complex manufacturing process, high process requirement and high production cost.
Disclosure of Invention
In summary, the present invention aims to solve the technical shortcomings of the existing optical coupling lens structure that lens surfaces are required to be processed on a light incident side and a light emergent side of a lens respectively, the manufacturing process is complex, the process requirement is high, and the production cost is high, and provide a free-form surface reflective coupling lens.
In order to solve the technical problems, the invention adopts the following technical scheme:
The free-form surface reflection type coupling lens is characterized by comprising a first light guide part corresponding to a laser light source and a second light guide part corresponding to a light receiving module; one side of the first light guide part corresponding to the laser light source is a first transmission surface, one side of the second light guide part corresponding to the light receiving module is a second transmission surface, and a free curved surface part is arranged at an included angle of an optical axis of the other side of the first light guide part and the other side of the second light guide part; the free-form surface part comprises a base material which is integrally formed with the first light guide part and the second light guide part and has the outer surface shape of a free-form surface, and a reflecting film layer arranged on the outer layer of the free-form surface; the deflection angle of the incident light of the principal ray of the first light guide part and the emergent light of the second light guide part on the free curved surface part is between 45+/-3 degrees; the laser light source led in by the first light guide part is reflected by the free curved surface part, and forms converged light rays to be emitted by the second transmission surface of the second light guide part, and the emergent converged focus corresponds to the light receiving module to realize light coupling.
The parameter characteristics of the free-form surface reflective coupling lens meet the following formula definition:
Wherein z is the sagittal amount of the free-form surface, c is the curvature of the curved surface vertex, k is the conic coefficient, aiEi is the coefficient of the higher order term of the free-form surface, x, y is the x, y coordinates of the point on the free-form surface, and x, y and z together form the 3-dimensional coordinates of the point; curved surface vertex radius of curvature r=1/c.
The first light guide part and the second light guide part are of cone structures, and the first transmission surface and the second transmission surface are cone bottom end surfaces of the first light guide part and the second light guide part respectively.
The beneficial effects of the invention are as follows: the invention adopts free curved surface to lead in light to directly realize the convergence and turning of the light through one free curved surface reflection, does not need to process lens surfaces on the light inlet side and the light outlet side of the lens respectively, has simple structure and is suitable for mass production. The invention adopts the reflective lens with free curved surface, which is insensitive to the wavelength of the laser light source, the wavelength drift of the laser does not affect the coupling efficiency, and the invention is especially suitable for the laser light sources with different wavelengths and has the advantage of high coupling efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a conventional coupling lens.
Fig. 2 is a schematic structural diagram of a coupling lens according to the present invention.
Fig. 3 is a schematic perspective view of the present invention.
Detailed Description
The structure of the present invention will be further described with reference to the accompanying drawings and preferred embodiments of the present invention.
Referring to fig. 2 and 3, the free-form surface reflective coupling lens disclosed by the invention comprises a first light guide part 1 corresponding to a laser light source and a second light guide part 2 corresponding to a light receiving module; the side of the first light guide part 1 corresponding to the laser light source is a first transmission surface 11, the side of the second light guide part 2 corresponding to the light receiving module is a second transmission surface 21, and a free curved surface part 3 is arranged at the included angle of the optical axis between the other side of the first light guide part 1 and the other side of the second light guide part 2; the preferable scheme is as follows: the first light guide part 1 and the second light guide part 2 are of cone structures, and the first transmission surface and the second transmission surface are cone bottom end surfaces of the first light guide part and the second light guide part respectively. The free-form surface part comprises a base material which is integrally formed with the first light guide part and the second light guide part and has the outer surface shape of a free-form surface, and a reflecting film layer arranged on the outer layer of the free-form surface; the substrate is used for forming a specific free-form surface shape, and the reflecting film layer realizes a surface reflecting effect through a film coating process. The deflection angle of the incident light of the principal ray of the first light guide part and the emergent light of the second light guide part on the free curved surface part is between 45+/-3 degrees; the laser light source led in by the first light guide part is reflected by the free curved surface part, and forms converged light rays to be emitted by the second transmission surface of the second light guide part, and the emergent converged focus corresponds to the light receiving module to realize light coupling.
The parameter characteristics of the free-form surface reflective coupling lens meet the following formula:
Wherein z is the sagittal amount of the free-form surface, c is the curvature of the curved surface vertex, k is the conic coefficient, aiEi is the coefficient of the higher order term of the free-form surface, x, y is the x, y coordinates of the point on the free-form surface, and x, y and z together form the 3-dimensional coordinates of the point; curved surface vertex radius of curvature r=1/c.
In the implementation process, according to the above formula description of the free-form surface, the curvature radius R of the curved surface vertex, the conic coefficient k and the coefficient AiEi of the higher-order term of the free-form surface can be specifically represented by the following table data, wherein X1Y0 represents the higher-order term A1E0 (X, Y), that is, X1Y 0X 1X 0Y 0; X0Y1 represents the higher order term A0E1 (X, Y), i.e., X0Y 1X 0Y 1; X3Y1 represents the higher order term A3E1 (X, Y), i.e., X3Y 1X 3Y 1; and so on.
The working mode of the free-form surface reflective coupling mirror is as follows: after the laser light source emits light, the light is reflected by the free-form surface reflecting surface to form converged light, and the optical fiber or other coupling target devices are placed at a converging focus to realize coupling, so that the light entering by a collimating lens and the focusing by a focusing lens are not needed, and the free-form surface reflecting lens has the following advantages:
1. the laser is insensitive to the wavelength of the light source, the wavelength drift of the laser does not influence the coupling efficiency, and the laser is applicable to laser light sources with different wavelengths.
2. The light can directly pass through a free curved surface to realize collimation effect, and meanwhile, the light can be converged and turned while being reflected, so that the light collecting device is simple in structure and suitable for mass production.
Claims (2)
1. The free-form surface reflection type coupling lens is characterized by comprising a first light guide part corresponding to a laser light source and a second light guide part corresponding to a light receiving module; one side of the first light guide part corresponding to the laser light source is a first transmission surface, one side of the second light guide part corresponding to the light receiving module is a second transmission surface, and a free curved surface part is arranged at an included angle of an optical axis of the other side of the first light guide part and the other side of the second light guide part; the free-form surface part comprises a base material which is integrally formed with the first light guide part and the second light guide part and has the outer surface shape of a free-form surface, and a reflecting film layer arranged on the outer layer of the free-form surface; the deflection angle of the incident light of the principal ray of the first light guide part and the emergent light of the second light guide part on the free curved surface part is between 45+/-3 degrees; the laser light source led in by the first light guide part is reflected by the free curved surface part, forms converged light and then is emitted by the second transmission surface of the second light guide part, and the emergent converged focus corresponds to the light receiving module to realize optical coupling;
the first light guide part and the second light guide part are of cone structures, and the first transmission surface and the second transmission surface are cone bottom end surfaces of the first light guide part and the second light guide part respectively;
There is no need to process lens surfaces on the light entrance side and the light exit side of the lens, respectively.
2. The freeform reflective coupling lens according to claim 1, wherein: the parameter characteristics of the free-form surface reflective coupling lens meet the following formula definition:
Wherein z is the sagittal amount of the free-form surface, c is the curvature of the curved surface vertex, k is the conic coefficient, aiEi is the coefficient of the higher order term of the free-form surface, x, y are the x, y coordinates of the point on the free-form surface, and x, y and z together form the 3-dimensional coordinates of the point; curved surface vertex radius of curvature r=1/c.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011150104.2A CN112162368B (en) | 2020-10-23 | 2020-10-23 | A free-form surface reflective coupling lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011150104.2A CN112162368B (en) | 2020-10-23 | 2020-10-23 | A free-form surface reflective coupling lens |
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| CN112162368A CN112162368A (en) | 2021-01-01 |
| CN112162368B true CN112162368B (en) | 2024-11-26 |
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| CN113835232A (en) * | 2021-09-30 | 2021-12-24 | 华中科技大学 | A speckle elimination device, laser projection imaging system and laser illumination imaging system |
| CN114019666B (en) * | 2021-10-25 | 2023-08-25 | 中国科学院长春光学精密机械与物理研究所 | A total reflection LED micro-illumination light distribution element |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107300777A (en) * | 2017-08-18 | 2017-10-27 | 深圳惠牛科技有限公司 | A kind of imaging system reflected based on double free form surfaces |
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| US7081999B2 (en) * | 2000-09-27 | 2006-07-25 | Canon Kabushiki Kaisha | Image display apparatus and head mounted display using it |
| US7254296B2 (en) * | 2003-01-16 | 2007-08-07 | Sae Magnetics (Hong Kong) Limited | Apparatus for improved fiber optic coupling efficiency |
| TWI432790B (en) * | 2010-04-29 | 2014-04-01 | Univ Nat Changhua Education | The collimating lens structure with free - form surface and its design method |
| JP2016143707A (en) * | 2015-01-30 | 2016-08-08 | 住友電工デバイス・イノベーション株式会社 | Light receiving element |
| CN205539724U (en) * | 2016-04-05 | 2016-08-31 | 杭州映墨科技有限公司 | A catadioptric wears and shows optical system for appearing three -dimensional scene |
| US10007072B1 (en) * | 2017-02-28 | 2018-06-26 | Foxconn Interconnect Technology Limited | Optical coupling system having a perturbed curved optical surface that reduces back reflection and improves mode matching in forward optical coupling |
| CN109085734B (en) * | 2017-06-13 | 2024-11-19 | 艾优优（深圳）技术有限公司 | Laser light source combining device |
| JP7047240B2 (en) * | 2018-01-30 | 2022-04-05 | 日亜化学工業株式会社 | Lighting equipment |
| CN110837152B (en) * | 2019-11-12 | 2023-06-09 | 浙江光塔节能科技有限公司 | Coupling lens and system thereof |
| CN111045195A (en) * | 2019-12-31 | 2020-04-21 | 深圳市都乐精密制造有限公司 | Wide-angle optical lens for mobile phone |
| CN111796350A (en) * | 2020-07-09 | 2020-10-20 | 欧菲微电子技术有限公司 | Reflective collimating mirror, laser module, camera and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107300777A (en) * | 2017-08-18 | 2017-10-27 | 深圳惠牛科技有限公司 | A kind of imaging system reflected based on double free form surfaces |
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