CN108169918B - Underwater imaging laser illumination light spot homogenization adjusting device - Google Patents
Underwater imaging laser illumination light spot homogenization adjusting device Download PDFInfo
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- CN108169918B CN108169918B CN201711462308.8A CN201711462308A CN108169918B CN 108169918 B CN108169918 B CN 108169918B CN 201711462308 A CN201711462308 A CN 201711462308A CN 108169918 B CN108169918 B CN 108169918B
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- circular ring
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- adjusting device
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0961—Lens arrays
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention belongs to the technical field of optical illumination and imaging, and particularly relates to a homogenizing adjusting device for an illumination spot of underwater imaging laser. The lens comprises a lens barrel, a first fixed block, a second fixed block, a first circular ring and a second circular ring, wherein the first fixed block, the second fixed block, the first circular ring and the second circular ring are arranged in the lens barrel and are coaxial with the lens barrel; the first fixing block and the second fixing block are respectively used for fixing the first circular ring and the second circular ring, and the first circular ring and the second circular ring are respectively used for fixing two micro lenses; through the mechanical structure design, the micro-adjustment of relative axial distance error, relative rotation error and relative translation error (plane movement in X and Y directions) between two groups of micro-lenses is effectively realized by adopting a mode of independently adjusting four degrees of freedom, the strict alignment of the optical axes of two groups of micro-lens arrays is ensured, the adjustment precision is high, the adjustment method is simple, and the light spot quality is good.
Description
Technical Field
The invention belongs to the technical field of optical illumination and imaging, and particularly relates to a device for homogenizing an output beam of an illumination laser in underwater imaging by using a double-row micro-lens array adjusting mechanism.
Background
When underwater imaging is carried out, the water body has strong absorption and scattering to natural light, and when the natural light is used as an illumination light source, the energy attenuation of the light is large, and the transmission distance is short. Therefore, in an underwater imaging camera system, a laser light source is mostly adopted for illumination. The light spots directly emitted by the laser obey Gaussian distribution, the energy distribution is uneven, the characteristics of large central energy and low edge energy are presented, the imaging effect of an underwater camera can be influenced by adopting the light source for illumination, the light spots can not be directly used, and the light spots directly emitted by the laser need to be shaped into flat-top light beams, so that the energy of the whole light spots is uniformly distributed.
The current widely applied solutions are as follows: binary diffraction element, hollow conduit and microlens array. The micro lens array method has the characteristics of small volume of a light beam homogenization system, high energy transmission efficiency, insensitivity to input light intensity distribution and the like, and can also realize the advantages of certain focal depth and the like, so the method is more and more applied to the homogenization of laser.
The common microlens array method is formed by combining two rows of microlenses connected in series, and the two rows of microlenses must have a strict relative position relationship, that is, each microlens unit needs to be strictly aligned on the premise of ensuring the focal length between the two microlenses. This requires that the two microlenses have a certain adjustment mechanism to eliminate errors due to the machining assembly of the mounting body and the like.
Disclosure of Invention
The invention aims to provide an underwater imaging laser illumination light spot homogenization adjusting device, which effectively realizes the micro-adjustment of relative axial distance error, relative rotation error and relative translation error (planar movement in X and Y directions) between two groups of micro-lenses by adopting a mode of independently adjusting four degrees of freedom through a mechanical structure design, ensures the strict alignment of the optical axes of two groups of micro-lens arrays, and has high adjustment precision, simple adjusting method and good light spot quality.
The technical scheme of the invention is to provide an underwater imaging laser illumination light spot homogenization adjusting device, which is characterized in that: the lens barrel fixing device comprises a lens barrel, a first fixing block, a second fixing block, a first circular ring and a second circular ring, wherein the first fixing block, the second fixing block, the first circular ring and the second circular ring are arranged in the lens barrel and are coaxial with the lens barrel; the first fixing block and the second fixing block are respectively used for fixing the first circular ring and the second circular ring, and the first circular ring and the second circular ring are respectively used for fixing the two micro lenses;
the fixing and adjusting device comprises a first set screw, a second set screw, an adjusting screw and a shaft-moving screw;
the center of the first fixed block is provided with an oval through hole, the minor axis direction of the oval through hole is defined as the vertical direction, and the major axis direction of the oval through hole is defined as the left-right direction;
the inner wall of the lens cone is provided with a hole groove, the outer wall of the left side and the outer wall of the right side of the first fixing block are both planes and are attached to the plane of the hole groove in the lens cone, and the distance between the upper cambered surface and the lower cambered surface of the hole groove is larger than the distance between the upper cambered surface and the lower cambered surface of the first fixing block;
the first circular ring is positioned in the oval through hole, and the upper part and the lower part of the oval through hole are tightly attached to the excircle of the first circular ring;
the first set screw and the second set screw are respectively positioned on the short axis and the long axis extension line of the oval through hole, the first set screw and the second set screw penetrate through the lens cone, and the head parts of the first set screw and the second set screw respectively push against the first circular ring and the first fixed block;
an annular protrusion is further arranged along the circumferential direction of the inner wall of the lens barrel, and the second fixing block is in contact with one end face of the annular protrusion; one end of the axial screw penetrates through the front end cover of the lens cone, the second fixed block and the annular protrusion in sequence and is limited on the other end face of the annular protrusion through an elastic retaining ring for the shaft; the other end of the axial screw is contacted with the front end cover of the lens cone; the axial moving screw is in threaded connection with the second fixed block;
a circular through hole is formed in the center of the second fixing block, the second circular ring is fixed in the circular through hole and can rotate circumferentially along the inner wall of the circular through hole, threaded holes are formed in the radial direction of the second circular ring, waist holes are formed in the second fixing block and the lens barrel, and the adjusting screw penetrates through the lens barrel and the waist holes of the second fixing block to be fixed with the threaded holes in the second circular ring.
Preferably, in order to realize the second fixing speed and the stable axial movement of the second circular ring, the underwater imaging laser illumination light spot homogenization adjusting device further comprises a guide polished rod, wherein one end of the guide polished rod sequentially penetrates through the front end cover of the lens barrel, the second fixing block and the annular protrusion to be limited on the other end face of the annular protrusion; the other end of the guide polish rod is tightly pressed on the end surface of the front end cover of the lens cone.
Preferably, the lens barrel is provided with 2 threaded holes at the upper and lower parts and 2 through holes at the left and right parts, the two threaded holes are positioned on the extension line of the minor axis of the elliptical through hole, and the through hole is positioned on the extension line of the major axis of the elliptical through hole;
two threaded holes are formed in the first fixing block and located on an extension line of a long axis of the elliptical hole, and the first fastening screw penetrates through the through hole of the lens barrel and the threads on the first fixing block in sequence and then tightly pushes the first circular ring.
Preferably, the first fixing block is further provided with two blind holes, and the second set screw penetrates through the thread of the lens barrel to jack the blind holes tightly.
Preferably, the thickness of the first fixing block is greater than that of the first ring, a groove is formed in the circumferential direction of the inner wall of the first fixing block, and the first ring is partially clamped in the groove.
Preferably, the invention further comprises a small end cover, the small end cover is positioned on the end face of the second fixing block, an annular groove is formed in the second fixing block along the circumferential direction of the circular through hole, and the second circular ring is positioned in the annular groove and fixed through the small end cover.
Preferably, the present invention further comprises a locking mechanism by which the adjusting screw is locked in a fixed position.
Preferably, the locking mechanism includes a lock nut and a washer.
Preferably, the micro lens is fixed in the first circular ring and the second circular ring through glue injection.
Preferably, the other end of the guide polish rod is pressed on the end surface of the front end cover of the lens barrel through a nut.
The beneficial effects of the invention are:
1) The adjusting device can be simplified into four-freedom-degree adjustment, two groups of micro-lens array optical axes can be completely aligned, the respective freedom-degree adjustments are not interfered with each other, and the adjusting precision is high;
2) The invention realizes the left-right translation and the up-down translation through the two independent adjusting modules, and the subsidiary rotating effect generated by common adjustment can not be generated;
3) The mode that uses the screw thread is adjusted translation and axial displacement and is had higher regulation precision, to the rotation regulation and the axial adjustment that the regulating variable is great relatively, has added locking mechanism, has good regulation stability and operation convenience.
4) After adjustment, interference fringes of laser emergent light spots are effectively reduced, speckle phenomenon is reduced, and the light spot illumination is more uniform;
5) The device has small volume, uniform output light intensity distribution and high energy efficiency.
Drawings
FIG. 1 is a rear end view of a dodging lens including an adjustment device of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a cross-sectional view taken at C-C of FIG. 1;
FIG. 5 is a view taken along line D of FIG. 1;
the reference numbers in the figures are: 1-lens cone, 2-front end cover, 3-first fixed block, 4-first ring, 5-second set screw, 6-second fixed block, 7-small end cover, 8-second ring, 9-axial screw, 10-guide polished rod, 11-spring washer, 12-nut, 13-elastic retainer ring for shaft, 14-first set screw, 15-adjusting screw, 16-locking nut, 17-gasket, 18-first hexagon socket screw, 19-second hexagon socket screw, 20-microlens, 21-annular protrusion.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
With reference to fig. 1 and 2, it can be seen that the adjusting device of the present invention mainly includes a lens barrel 1, a first fixing block 3, a second fixing block 6, a first ring 4 and a second ring 8, which are disposed in the lens barrel 1 and coaxial with the lens barrel 1;
as can be seen from fig. 1, the inner wall of the lens barrel 1 is provided with a hole groove, the left outer wall and the right outer wall of the first fixing block 3 are planes and are attached to the hole groove plane in the lens barrel 1, and the distance between the upper cambered surface and the lower cambered surface of the hole groove is greater than the distance between the upper cambered surface and the lower cambered surface of the first fixing block 3;
an oval through hole is formed in the center of the first fixing block 3, the oval through hole is a hole in the left-right direction, the first circular ring 4 is located inside the oval through hole, and the upper portion and the lower portion of the oval through hole are tightly attached to the outer circle of the first circular ring 4;
the lens barrel 1 is provided with 2 threaded holes at the upper part and the lower part, 2 through holes at the left part and the right part, two threaded holes are positioned on the minor axis extension line of the oval through hole, and the through hole is positioned on the major axis extension line of the oval through hole;
two threaded holes (see fig. 3) are formed in the first fixing block 3, the two threaded holes are located on an extension line of a long axis of the elliptical hole, the first set screw 14 sequentially penetrates through the through hole of the lens barrel 1 and the threaded hole in the first fixing block 3 and then tightly pushes the first circular ring 4, a blind hole can be formed in the first circular ring 4, and the head of the first set screw 14 tightly pushes the blind hole.
And the second set screw 5 penetrates through a threaded hole of the lens cone 1 in the minor axis direction of the oval through hole to tightly push the first fixing block 3.
As can be seen from fig. 2, a circular through hole is formed in the center of the second fixing block 6, an annular groove is formed in the second fixing block 6 along the circumferential direction of the circular through hole, the second ring 8 is located in the annular groove and fixed through the small end cover 7, and the second ring 8 is fixed in the circular through hole and can rotate circumferentially along the inner wall of the circular through hole;
an annular protrusion 21 is further arranged along the circumferential direction of the inner wall of the lens barrel 1, and the second fixing block 6 is in contact with one end face of the annular protrusion 21; one end of the axial screw 9 sequentially penetrates through the front end cover 2 of the lens barrel 1, the second fixed block 6 and the annular protrusion 21 and is limited on the other end face of the annular protrusion 21 through the elastic retaining ring 13 for the shaft; the other end of the axial screw 9 loosely contacts the front end cover 2 of the lens cone 1; the axial screw 9 is in threaded connection with the second fixed block 6; one end of the guide polished rod 10 sequentially passes through the lens cone front end cover 2, the second fixing block 6 and the annular protrusion 21 and is limited on the other end face of the annular protrusion 21; the other end of the guide polished rod 10 is pressed on the front end cover 2 of the lens cone through a nut 12.
As can be seen from fig. 4, the second ring 8 is provided with a threaded hole in the radial direction, waist holes are formed in the second fixing block 6 and the lens barrel 1, the adjusting screw 15 passes through the lens barrel 1 and the waist holes of the second fixing block 6 to be fixed with the threaded hole in the second ring 8, and the adjusting screw 15 is further provided with a locking nut 16 and a gasket 17.
Two microlens 20 are respectively packed in two different rings through injecting glue, wherein the first ring 4 can drive the microlens 20 to move up and down and left and right, and the second ring 8 can drive the microlens 20 to move axially and rotate relative to the microlens 20 in the first ring 4.
The method is realized by the following steps:
left-right translation of the microlenses 20 in the first circular ring 4: as shown in fig. 1 and 3, the first ring 4 is installed in the oval through hole of the first fixing block 3, the oval through hole is a hole in the left-right direction, the top and the bottom of the oval through hole are tightly attached to the excircle of the first ring 4, the first set screw 14 passes through the through holes in the left side and the right side of the lens barrel 1 and is installed in the threaded hole of the first fixing block 3, and the first ring 4 can be horizontally moved under the action of the first set screw 14.
Up-down translation of the microlenses 20 in the first circular ring 4: as shown in fig. 1 and 2, the first fixing block 3 is a non-standard circle, two sides of the first fixing block are flattened and attached to a hole groove plane matched with the first fixing block in the lens barrel 1, the distance between the upper arc surface and the lower arc surface of the hole groove is larger than the distance between the upper arc surface and the lower arc surface of the first fixing block 3, the second set screw 5 is installed in threaded holes at the upper side and the lower side of the lens barrel 1, and the first fixing block 3 and the first ring 4 can move up and down under the action of the second set screw 5.
Rotation of the microlenses 20 in the second ring 8: as shown in fig. 4 and 5, the second ring 8 is mounted in the groove of the second fixing block 6 through the small end cap 7, and since the matching circumferential surface is circular, the second ring 8 can rotate around the axis thereof relative to the second fixing block 6, the second ring 8 is provided with a threaded hole in the radial direction, the second fixing block 6 is provided with a waist hole in the circumferential position direction corresponding to the second fixing block 6, and the lens barrel 1 is also provided with a larger hole in the adjusted position, therefore, the adjusting screw 15 penetrates through the larger hole in the lens barrel 1 and the waist hole in the second fixing block 6 to be connected with the threaded hole in the second ring 8, and can drive the second ring 8 to rotate relative to the second fixing block 6, and after the adjustment is completed, the outer arc surface of the second ring 8 can be pressed against the inner arc surface of the second fixing block 6 by screwing the adjusting screw 15, so as to perform locking.
Axial movement of the microlenses 20 in the second ring 8: as shown in fig. 2, the front end cap 2 is connected to the lens barrel 1 by a bolt, one end of the axial screw 9 and the guide rod 10 is installed in a hole of the front end cap 2, the other end is installed in a hole in the lens barrel 1, and the axial screw 9 is axially loosely fixed by using a shaft circlip 13. The second fixing block 6 is provided with a threaded hole and a unthreaded hole, is respectively connected with the axial screw 9 and the guide polished rod 10 and is arranged in the lens cone 1. The second fixed block 6 can be driven by rotating the axial moving screw 9 to move and adjust along the guide polished rod 10 in the axial direction. After the adjustment, the second fixing block 6 is locked at the adjusted axial position by tightening the lock nut 16.
Claims (8)
1. The utility model provides an underwater imaging laser illumination light spot homogenization adjusting device which characterized in that: comprises a lens cone (1), a first fixed block (3), a second fixed block (6), a first circular ring (4) and a second circular ring (8), wherein the first fixed block (3), the second fixed block (6), the first circular ring (4) and the second circular ring (8) are arranged in the lens cone (1) and are coaxial with the lens cone (1); the first fixing block (3) and the second fixing block (6) are respectively used for fixing the first circular ring (4) and the second circular ring (8), and the first circular ring (4) and the second circular ring (8) are respectively used for fixing the two micro lenses (20);
the device also comprises a fixed adjusting device, wherein the fixed adjusting device comprises a first set screw (14), a second set screw (5), an adjusting screw (15) and a shaft-moving screw (9);
an elliptical through hole is formed in the center of the first fixing block (3), the minor axis direction of the elliptical through hole is defined as the vertical direction, and the major axis direction of the elliptical through hole is defined as the horizontal direction;
the inner wall of the lens cone (1) is provided with a hole groove, the outer wall of the left side and the outer wall of the right side of the first fixing block (3) are planes and are attached to the plane of the hole groove in the lens cone (1), and the distance between the upper cambered surface and the lower cambered surface of the hole groove is larger than the distance between the upper cambered surface and the lower cambered surface in the first fixing block (3);
the first circular ring (4) is positioned inside the oval through hole, and the upper part and the lower part of the oval through hole are tightly attached to the excircle of the first circular ring (4);
the first set screw (14) and the second set screw (5) are respectively positioned on the short axis and long axis extension lines of the oval through hole, the first set screw (14) and the second set screw (5) penetrate through the lens cone (1), and the head parts of the first set screw (14) and the second set screw (5) respectively push against the first circular ring (4) and the first fixed block (3);
an annular protrusion (21) is further arranged along the circumferential direction of the inner wall of the lens barrel (1), and the second fixing block (6) is in contact with one end face of the annular protrusion (21); one end of the axial-moving screw (9) sequentially penetrates through the lens barrel front end cover (2), the second fixing block (6) and the annular protrusion (21) and is limited on the other end face of the annular protrusion (21) through an elastic retaining ring (13) for a shaft; the other end of the axial screw (9) is contacted with the front end cover (2) of the lens cone; the axial moving screw (9) is in threaded connection with the second fixed block (6);
a circular through hole is formed in the center of the second fixing block (6), the second circular ring (8) is fixed in the circular through hole and can rotate circumferentially along the inner wall of the circular through hole, a threaded hole is formed in the radial direction of the second circular ring (8), waist holes are formed in the second fixing block (6) and the lens cone (1), and the adjusting screw (15) penetrates through the lens cone (1) and the waist holes of the second fixing block (6) to be fixed with the threaded hole in the second circular ring (8); the device also comprises a guide polish rod (10), wherein one end of the guide polish rod (10) sequentially penetrates through the lens barrel front end cover (2), the second fixing block (6) and the annular protrusion (21) to be limited on the other end face of the annular protrusion (21); the other end of the guide polish rod (10) is tightly pressed on the end surface of the lens cone front end cover (2);
the micro lens (20) is fixed in the first circular ring (4) and the second circular ring (8) through glue injection.
2. The underwater imaging laser illumination spot homogenization adjusting device according to claim 1, characterized in that: the lens cone (1) is provided with 2 threaded holes at the upper and lower parts and 2 through holes at the left and right parts, the two threaded holes are positioned on the extension line of the minor axis of the oval through hole, and the through hole is positioned on the extension line of the major axis of the oval through hole;
two threaded holes are formed in the first fixing block (3), the two threaded holes are located on an extension line of a long axis of the elliptical hole, and a first set screw (14) sequentially penetrates through a through hole of the lens cone (1) and a thread on the first fixing block (3) and then tightly pushes the first circular ring (4).
3. The underwater imaging laser illumination light spot homogenization adjusting device according to claim 2, wherein: two blind holes are formed in the first fixing block (3), and a second set screw (5) penetrates through the thread of the lens barrel (1) to jack the blind holes tightly.
4. The underwater imaging laser illumination spot homogenization adjusting device according to claim 3, characterized in that: the thickness of first fixed block (3) is greater than the thickness of first ring (4), and first fixed block (3) inner wall circumference has the recess, and first ring (4) part is gone into in the recess.
5. The underwater imaging laser illumination light spot homogenization regulating device according to claim 4, characterized in that: the novel fixing device is characterized by further comprising a small end cover (7), wherein the small end cover (7) is located on the end face of the second fixing block (6), an annular groove is formed in the second fixing block (6) along the circumferential direction of the circular through hole, and the second circular ring (8) is located in the annular groove and fixed through the small end cover (7).
6. The underwater imaging laser illumination spot homogenization adjusting device according to claim 5, characterized in that: the locking mechanism is further included, and the adjusting screw rod (15) is locked at a fixed position through the locking mechanism.
7. The underwater imaging laser illumination spot homogenization adjusting device according to claim 6, characterized in that: the locking mechanism comprises a locking nut (16) and a gasket (17).
8. The underwater imaging laser illumination spot homogenization adjusting device according to claim 7, characterized in that: the other end of the guide polish rod (10) is tightly pressed on the end surface of the front end cover (2) of the lens cone through a nut (12).
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| CN201711462308.8A CN108169918B (en) | 2017-12-28 | 2017-12-28 | Underwater imaging laser illumination light spot homogenization adjusting device |
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| CN201711462308.8A CN108169918B (en) | 2017-12-28 | 2017-12-28 | Underwater imaging laser illumination light spot homogenization adjusting device |
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| CN108169918B true CN108169918B (en) | 2023-04-11 |
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| CN110908058B (en) * | 2019-10-31 | 2023-04-07 | 中国航空工业集团公司洛阳电光设备研究所 | Multi freedom optical axis timing device |
| CN113031176B (en) * | 2019-12-24 | 2023-01-03 | 长春长光华大智造测序设备有限公司 | Optical fiber adjusting mechanism |
| CN111929878B (en) * | 2020-07-10 | 2021-07-27 | 中国科学院西安光学精密机械研究所 | Off-axis three-mirror short-focus front objective lens system of hyperspectral imager |
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| US6912090B2 (en) * | 2003-03-18 | 2005-06-28 | Lucent Technologies Inc. | Adjustable compound microlens apparatus with MEMS controller |
| US7265908B2 (en) * | 2005-12-19 | 2007-09-04 | Coherent, Inc. | Apparatus for projecting a line of light from a diode-laser array |
| US7495838B2 (en) * | 2006-07-19 | 2009-02-24 | Inphase Technologies, Inc. | Collimation lens group adjustment for laser system |
| WO2012004995A1 (en) * | 2010-07-07 | 2012-01-12 | パナソニック株式会社 | Lens unit |
| CN101995664B (en) * | 2010-09-17 | 2013-03-27 | 北京工业大学 | Laser beam transformation shaper outputting uniform linear spots |
| JP6070741B2 (en) * | 2015-03-02 | 2017-02-01 | 住友電気工業株式会社 | Optical module |
| CN205049818U (en) * | 2015-09-11 | 2016-02-24 | 深圳市众坤高森科技有限公司 | Facula homogenizer and light filling lamp |
| CN207636853U (en) * | 2017-12-28 | 2018-07-20 | 中国科学院西安光学精密机械研究所 | A kind of Underwater Imaging laser lighting light spot homogenizing regulating device |
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