CN102967944A - Optical mixing rod rotary structure for eliminating laser lighting speckles - Google Patents
Optical mixing rod rotary structure for eliminating laser lighting speckles Download PDFInfo
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- CN102967944A CN102967944A CN2012104575051A CN201210457505A CN102967944A CN 102967944 A CN102967944 A CN 102967944A CN 2012104575051 A CN2012104575051 A CN 2012104575051A CN 201210457505 A CN201210457505 A CN 201210457505A CN 102967944 A CN102967944 A CN 102967944A
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Abstract
The invention discloses an optical mixing rod rotary structure for eliminating laser lighting speckles. The optical mixing rod rotary structure comprises a coupling lens, an optical mixing rod, a rotary mechanism and a control circuit. A light source emits laser, the laser enters the coupling lens, and the coupling lens converges the laser emitted by the light source and outputs the laser to an incident plane of the optical mixing rod. A shaft of the optical mixing rod coincides with an optical axis of the laser output by the coupling lens, the optical mixing rod is located in the rotary mechanism, the rotary mechanism drives the optical mixing rod to perform constant speed self-rotational motion, and a rotary shaft coincides with the optical axis. The laser passes through the optical mixing rod and then is output from the incident plane of the optical mixing rod. The control circuit controls the rotary speed of the rotary mechanism. The optical mixing rod rotary structure can effectively eliminate the laser speckles, greatly improves lighting efficiency and imaging quality, simultaneously can maintain laser energy efficiency and a polarization characteristic and solves contradiction of speckle elimination and energy efficiency in a conventional laser speckle eliminating technology.
Description
Technical field
The present invention relates to a kind of optical mixing rod rotational structure for the elimination of laser lighting speckle, belong to the laser lighting technical field.
Background technology
Continuous miniaturization along with all kinds of digital products, conventional bulb source can not satisfy the demand of various product, and laser is compared with conventional lighting source as a kind of new type light source of miniaturization, laser can allow the brightness of image of system is higher, colour gamut is wider, and volume is less.
Laser is as the lighting source that a kind of monochromaticity is good, brightness is high, the coherence is good, when the illumination optical rough surface, can there be a kind of speckle phenomena, speckle not only affects the resolution of image, and the outward appearance of image is modulated by the nutty structure of speckle field, had a strong impact on picture quality, therefore must have been suppressed.
The approach that addresses this problem mainly contains three kinds, 1) to the control of light source space and coherence in frequency domain, 2) based on the time domain average of finite aperture space samples, 3) digital processing three classes, wherein 1) be by the technology on optics or the material lighting source to be controlled, because this approach relates to the Disciplinary Frontiers such as semiconductor material, semiconductor machining, to be difficult to realize in a short time, 3) then normally after obtaining digital picture, process again and analyze, can not process in real time 2) be to realize and to bring actual application value in a short time.
Time domain average based on the finite aperture space samples, present stage mainly passes through: 1) shooting angle of control light source reduces the spatial domain coherence of light source, 2) sensor was on average realized in the sampling realization time domain in integral time, all there is the contradiction between capacity usage ratio and the speckle elimination in two kinds of traditional methods, speckle is eliminated the acceptable level of human eye, prior art need to be lost at least 50% energy, and can lose polarization characteristic and the monochromaticity of laser itself, these all are useful for micro lighting or imaging system, and in microsystem, because the restriction of volume, the luminous energy of LASER Light Source itself does not just reach the standard of conventional bulb light source, and it is worthless therefore reducing capacity usage ratio.
Summary of the invention
The objective of the invention is for solve that speckle in the conventional laser speckle technology for eliminating is eliminated and energy efficiency between contradiction, a kind of optical mixing rod rotational structure of eliminating for the laser lighting speckle has been proposed.
A kind of optical mixing rod rotational structure for the elimination of laser lighting speckle comprises coupled lens, optical mixing rod, rotating mechanism and control circuit;
The light source Emission Lasers, laser enters coupled lens, and coupled lens converges the laser that light source sends, and exports in the plane of incidence of optical mixing rod;
The optical axis coincidence of the axle of optical mixing rod and coupled lens Output of laser, optical mixing rod is arranged in rotating mechanism, and rotating mechanism drives optical mixing rod and does at the uniform velocity spinning campaign, and rotating shaft and optical axis coincidence; Laser is by behind the optical mixing rod, from the exit facet output of optical mixing rod;
Control circuit is finished the control to the rotating mechanism rotating speed.
The invention has the advantages that:
(1) eliminate laser speckle has effectively greatly improved illumination efficiency and image quality;
(2) adopt rotation optical mixing rod structure, when eliminating speckle, can keep energy efficiency and the polarization characteristic of laser, solved that speckle in the conventional laser speckle technology for eliminating is eliminated and energy efficiency between contradiction;
(3) propose two kinds of rotating mechanisms for different application scenarios, be applicable to different microminiaturization illumination occasions;
(4) the invention provides the system and device that a kind of laser speckle is eliminated, under the prerequisite that keeps energy of light source efficient and polarization characteristic, reach the purpose of eliminate laser speckle by rotating optical mixing rod, and small volume, be easy to processing.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is micro hollow motor cut-open view of the present invention;
Fig. 3 is the connection glued construction front elevation that the present invention adopts the micro hollow motor;
Fig. 4 is normal miniature motor configuration cut-open view of the present invention;
Fig. 5 is the connection glued construction front elevation that the present invention adopts the normal miniature motor;
Fig. 6 is the result schematic diagram that speckle of the present invention is eliminated.
Among the figure:
1-coupled lens, 2-optical mixing rod, 3-rotating mechanism
4-control circuit, 5-micro hollow motor, 6-glued construction
7-micro hollow motor axis hole, 8-normal miniature motor 9-rotation hollow cylinder
10-spring bearing, 11-gear A, 12-gear B
13-microsystem supporting member, 14-optical cement
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
The present invention is a kind of optical mixing rod rotational structure for the elimination of laser lighting speckle, as shown in Figure 1, comprises coupled lens 1, optical mixing rod 2, rotating mechanism 3 and control circuit 4.
Light source emission one-wavelength laser, laser enters coupled lens 1, and the laser that 1 pair of light source of coupled lens sends converges, and exports in the plane of incidence of optical mixing rod 2.
The optical axis coincidence of the axle of optical mixing rod 2 and coupled lens 1 Output of laser, optical mixing rod 2 is arranged in rotating mechanism 3, and rotating mechanism 3 drives optical mixing rod 2 and does at the uniform velocity spinning campaign, and rotating shaft and optical axis coincidence.Laser is by behind the optical mixing rod 2, from the exit facet output of optical mixing rod 2.
Rotating mechanism 3 is micro hollow motor 5 or normal miniature motor 8, when rotating mechanism 3 is micro hollow motor 5, as shown in Figures 2 and 3, the square sectional of the vertical axial of optical mixing rod 2 and micro hollow motor 5 axis holes 7 expose the cross section, fixedly be bonded on the glued construction 6 by optical cement 14, then optical mixing rod 2 just is fixed on the inside of micro hollow motor 5 indirectly.
When rotating mechanism 3 is the normal miniature motor, structure as shown in Figure 4, the square sectional of the vertical axial of optical mixing rod 2 fixedly is bonded on the glued construction 6 by optical cement 14 with the cross section of exposing of rotation hollow cylinder 9, and then optical mixing rod 2 just is fixed on the inside of rotation hollow cylinder 9 indirectly.Rotation hollow cylinder 9 is fixed on spring bearing 10 inside, one end and the gear A 11 of rotation hollow cylinder 9 are tightly bonding, the tightly interlock of gear B 12 of gear A 11 and normal miniature motor 8, normal miniature motor 8 driven gear B12 and gear A 11 rotations, gear A 11 driven rotary hollow cylinders 9 are at spring bearing 10 internal rotatings, and then drive optical mixing rod 2 is around self axle do spin rotation.Normal miniature motor 8 and rotation hollow cylinder 9 are fixing by microsystem supporting member 13.
Described glued construction 6 adopts material identical with optical mixing rod 2 for being coated with the wave plate of anti-reflection film.
Control circuit 4 adopts DSP, finishes the control to rotating mechanism 3 rotating speeds, and at the uniform velocity the rotating speed of spinning campaign is adjustable, to satisfy the different demands in the illumination.Be the rotating speed of control circuit 4 control micro hollow motors 5 or normal miniature motor 8.
Described optical mixing rod 2 adopts the cylindricality solid construction, the cross section is square, barred body employing refractive index is 1.518 K9 glass, four lateral surfaces of optical mixing rod 2 all are coated with one deck and increase anti-film, plane of incidence plating one deck anti-reflection film of optical mixing rod 2, optical mixing rod 2 is of a size of 2mm * 2mm * 18mm, satisfies microminiaturized demand fully.
Because glued construction 6 is for being coated with the wave plate of anti-reflection film, so the laser from the exit facet of optical mixing rod 2 is exported penetrates through glued construction 6.
The high degree of polarisation of light source emission and relevant laser, laser is finished multiple total reflection in the optical mixing rod 2 of at the uniform velocity rotation, the multi beam illuminating bundle of outgoing has different optical path differences and phase differential, finish the superposed average in the finite aperture, superposed average can't form stable speckle fringes each other, reaches the purpose of eliminating speckle.
Compare with traditional speckle technology for eliminating, the present invention does to spin at a high speed to rotate around optical axis by micro hollow motor or the conventional hollow motor drive optical mixing rod 2 of rotating mechanism 3, rotating speed is adjustable, when adopting 40 π/s rotating speed, finish mutual stack to the light beam of out of phase in integral time in (50ms) at human eye, be equivalent to the sample averaging of several separate speckle pattern, reach the purpose of eliminating speckle, can under the prerequisite that keeps elementary beam 90% energy, speckle contrast be dropped to 0.15% in the actual test of the present invention.
The result that speckle of the present invention is eliminated as shown in Figure 6, Fig. 6 (a) is for entering the speckle pattern before the optical mixing rod, the output pattern when Fig. 6 (b) is 40 π/s for the optical mixing rod speed of rotation can find that speckle has obtained effectively elimination.
Claims (6)
1. one kind is used for the optical mixing rod rotational structure that the laser lighting speckle is eliminated, and comprises coupled lens, optical mixing rod, rotating mechanism and control circuit;
The light source Emission Lasers, laser enters coupled lens, and coupled lens converges the laser that light source sends, and exports in the plane of incidence of optical mixing rod;
The optical axis coincidence of the axle of optical mixing rod and coupled lens Output of laser, optical mixing rod is arranged in rotating mechanism, and rotating mechanism drives optical mixing rod and does at the uniform velocity spinning campaign, and rotating shaft and optical axis coincidence; Laser is by behind the optical mixing rod, from the exit facet output of optical mixing rod;
Control circuit is finished the control to the rotating mechanism rotating speed.
2. a kind of optical mixing rod rotational structure of eliminating for the laser lighting speckle according to claim 1, when described rotating mechanism was the micro hollow motor, the optical mixing rod rotational structure also comprised glued construction;
The end face of optical mixing rod vertical axial and hollow motor axis hole vertical axial expose end face, be fixedly connected with glued construction.
3. a kind of optical mixing rod rotational structure of eliminating for the laser lighting speckle according to claim 1, when described rotating mechanism was the normal miniature motor, the optical mixing rod rotational structure also comprised glued construction, rotation hollow cylinder, spring bearing, gear A and gear B;
The end face of optical mixing rod vertical axial and the end face that exposes that rotates the hollow cylinder vertical axial, be fixedly connected with glued construction, the rotation hollow cylinder is fixed on spring bearing inside, one end of rotation hollow cylinder is fixedly connected with gear A, the gear B interlock of gear A and normal miniature motor, normal miniature motor driving gear B and gear A rotation, gear A driven rotary hollow cylinder drive optical mixing rod around self axle do spin rotation at the spring bearing internal rotating.
4. a kind of optical mixing rod rotational structure of eliminating for the laser lighting speckle according to claim 3, described normal miniature motor and rotation hollow cylinder are fixing by microsystem supporting member 13.
5. according to claim 2 or 3 or 4 described a kind of optical mixing rod rotational structures of eliminating for the laser lighting speckle, described optical mixing rod adopts the cylindricality solid construction, the cross section is square, barred body employing refractive index is 1.518 K9 glass, four lateral surfaces of optical mixing rod all are coated with one deck and increase anti-film, plane of incidence plating one deck anti-reflection film of optical mixing rod; Described glued construction is wave plate, adopts identical material with optical mixing rod, and plating one deck anti-reflection film.
6. a kind of optical mixing rod rotational structure of eliminating for the laser lighting speckle according to claim 1, described control circuit adopts DSP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104575051A CN102967944A (en) | 2012-11-14 | 2012-11-14 | Optical mixing rod rotary structure for eliminating laser lighting speckles |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012104575051A CN102967944A (en) | 2012-11-14 | 2012-11-14 | Optical mixing rod rotary structure for eliminating laser lighting speckles |
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| CN102967944A true CN102967944A (en) | 2013-03-13 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293700A (en) * | 2013-05-20 | 2013-09-11 | 北京航空航天大学 | Optical mixing rod vibration structure for laser illumination speckle reduction |
| CN105872504A (en) * | 2016-03-25 | 2016-08-17 | 联想(北京)有限公司 | Data processing method and electronic device |
| CN106773487A (en) * | 2017-01-06 | 2017-05-31 | 深圳市中科创激光技术有限公司 | Laser display apparatus |
| CN106773490A (en) * | 2017-01-17 | 2017-05-31 | 上海蔚来汽车有限公司 | Optical texture, optical system and optical means for eliminating laser projection speckle |
| CN108398804A (en) * | 2018-03-28 | 2018-08-14 | 四川长虹电器股份有限公司 | A kind of laser dissipation spot light path and laser projection light-source system |
| CN108761828A (en) * | 2018-06-25 | 2018-11-06 | 太原理工大学 | A kind of special dissipation spot light source of laser display |
| CN109137059A (en) * | 2018-10-12 | 2019-01-04 | 湖南文理学院 | A kind of preparation method of silicon-based nano porous silicon list convex lens |
| CN110651219A (en) * | 2017-05-19 | 2020-01-03 | 奥林巴斯株式会社 | Illumination device, imaging system including the illumination device, endoscope system including the imaging system, and microscope system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293700A (en) * | 2013-05-20 | 2013-09-11 | 北京航空航天大学 | Optical mixing rod vibration structure for laser illumination speckle reduction |
| CN105872504A (en) * | 2016-03-25 | 2016-08-17 | 联想(北京)有限公司 | Data processing method and electronic device |
| CN106773487A (en) * | 2017-01-06 | 2017-05-31 | 深圳市中科创激光技术有限公司 | Laser display apparatus |
| CN106773487B (en) * | 2017-01-06 | 2018-11-09 | 深圳市中科创激光技术有限公司 | Laser display apparatus |
| CN106773490A (en) * | 2017-01-17 | 2017-05-31 | 上海蔚来汽车有限公司 | Optical texture, optical system and optical means for eliminating laser projection speckle |
| CN110651219A (en) * | 2017-05-19 | 2020-01-03 | 奥林巴斯株式会社 | Illumination device, imaging system including the illumination device, endoscope system including the imaging system, and microscope system |
| CN108398804A (en) * | 2018-03-28 | 2018-08-14 | 四川长虹电器股份有限公司 | A kind of laser dissipation spot light path and laser projection light-source system |
| CN108398804B (en) * | 2018-03-28 | 2023-07-25 | 四川长虹电器股份有限公司 | Laser speckle eliminating light path and laser projection light source system |
| CN108761828A (en) * | 2018-06-25 | 2018-11-06 | 太原理工大学 | A kind of special dissipation spot light source of laser display |
| CN108761828B (en) * | 2018-06-25 | 2020-11-13 | 太原理工大学 | Special speckle eliminating light source for laser display |
| CN109137059A (en) * | 2018-10-12 | 2019-01-04 | 湖南文理学院 | A kind of preparation method of silicon-based nano porous silicon list convex lens |
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Application publication date: 20130313 |