CN112099183B - PEEK-based ultra-light continuous zoom lens - Google Patents
PEEK-based ultra-light continuous zoom lens Download PDFInfo
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- CN112099183B CN112099183B CN202011063937.5A CN202011063937A CN112099183B CN 112099183 B CN112099183 B CN 112099183B CN 202011063937 A CN202011063937 A CN 202011063937A CN 112099183 B CN112099183 B CN 112099183B
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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
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective 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
- G02B7/006—Filter holders
Abstract
The invention relates to an ultra-light type continuous zoom lens based on PEEK, which comprises a lens tube 1, a zoom lens tube 2, an objective lens group 4, a zoom group 5, a compensation group 6, a rear fixed group 7 and the like, wherein the lens tube 1, the zoom lens tube 2, a focusing gear 3, a rear fixed group lens barrel and the like are all made of PEEK materials. On the premise of ensuring the consistency of the optical axis stability and the optical axis of the lens, the invention reduces the quality and the volume of the lens as much as possible through the optimization of the structure and the materials, so that the lens is more convenient to carry. The continuous zoom lens has light weight, small volume and good reliability, can be assembled on various handheld and vehicle-mounted photoelectric devices, and has wide application.
Description
Technical Field
The invention relates to the technical field of photoelectric equipment, in particular to an ultra-light type continuous zoom lens based on PEEK.
Background
The television imaging technology is widely applied to television guidance and photoelectric reconnaissance, and various lenses are key to the television imaging technology, wherein the most widely applied lenses are continuous zoom lenses. The continuous zoom lens can clearly image targets with different distances and different sizes in a certain range.
Modern battlefield situations are complex and changeable, and the volume and weight of fighter carrying equipment are more and more strict, particularly various portable reconnaissance equipment is more strictly limited. Television imaging reconnaissance is also a necessary means of battlefield reconnaissance, and the television imaging equipment is required to be small in size and light in weight on the premise of meeting technical indexes. The research finds that the main weight of the television imaging device is the lens, and the continuous zoom lens also needs to switch the field of view to finish the large-field-of-view target searching and the small-field-of-view accurate tracking, and in the field of view conversion process, in order to prevent the target from losing, high requirements are also put forward on the consistency of the optical axis and the stability of the optical axis of the lens. Therefore, it is a challenge to reduce the volume and weight of the continuous zoom lens as much as possible while ensuring good optical axis consistency and optical axis stability.
The traditional lens component material is generally selected from aviation aluminum material (density is 2.7 g/cm) 3 ) Lens focal length is 2The weight of the material is 600g when 5mm-110 mm. To reduce the weight and bulk of the product, it is considered to replace a low density material. The PEEK is also called polyether-ether-ketone, is a special engineering plastic with excellent performances of high temperature resistance, self lubrication, easy processing, high mechanical strength and the like, and can be manufactured and processed into various automobile parts (such as automobile gears, oil screens and gear shifting starting discs), aircraft engine parts, automatic washing machine rotating wheels, medical instrument parts and other products. PEEK has a density of 1.4g/cm 3 Only about half of the aluminum material; its yield strength is 210MPa and thermal expansion coefficient is 25×10 -6 m/(mk), is substantially equivalent to aluminum. Although PEEK performance is very outstanding, the PEEK can not be used for completely replacing aluminum materials to prepare the ultra-light continuous zoom lens, because the consistency of the optical axis and the stability of the optical axis can not be ensured after the PEEK is completely replaced, and therefore the structure and the material collocation of the lens are required to be further optimized after the materials for replacing aluminum materials are selected.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide an ultra-light type continuous zoom lens based on PEEK, which comprises a lens tube 1, a zoom lens tube 2, an objective lens group 4, a zoom group 5, a compensation group 6 and a rear fixing group 7, wherein at least one part is made of PEEK materials. The zoom lens group 5 and the compensation group 6 are packaged in the lens tube 1, the zoom lens tube 2 is sleeved on the lens tube 1, and the objective lens group 4 and the rear fixed group 7 are fixedly connected with two ends of the lens tube 1 respectively; the zoom lens tube 2 is provided with a cam curve groove, and the lens tube 1 is provided with a corresponding straight line groove; the pin passes through the cam curve groove on the zoom lens tube 2 and the straight line groove on the lens tube 1 and is respectively fixedly connected with the zoom group 5 and the compensation group 6; when the zoom lens tube 2 rotates, the pin is driven to move along the cam curve groove on the zoom lens tube 2, and the pin drives the zoom group 5 and the compensation group 6 to move back and forth in the straight line groove of the lens tube 1, so that the continuous change of focal length is realized.
Further, the continuous zoom lens further comprises a zoom motor group 10, the zoom motor group 10 is fixed on the lens tube 1, a gear is arranged at the end part of the zoom lens tube 2, and an output shaft of the zoom motor group 10 is meshed with the gear at the end part of the zoom lens tube 2 to drive the zoom lens tube 2 to rotate and the zoom group 5 and the compensation group 6 to slide in a translational manner in the lens tube 1.
Further, the continuous zoom lens further comprises a focusing gear 3 and a focusing motor group 9, wherein the focusing gear 3 is sleeved on the lens tube 1, and the focusing motor group 9 is fixed on the lens tube 1. A focusing straight line groove is arranged on the lens tube 1, a corresponding linear focusing curve groove is arranged on the focusing gear 3, and an output shaft of the focusing motor group 9 is meshed with a gear on the focusing gear 3; the pin passes through a linear focusing curve groove on the focusing gear 3 and a focusing straight groove on the lens tube 1 and then is fixedly connected with the objective lens group 4; the focusing motor group 9 drives the focusing gear 3 to rotate and drives the pin to move along the linear focusing curve groove, and the pin drives the objective lens group 4 to move back and forth along the focusing straight groove of the lens tube to realize micro focusing, so that stable images are provided for the continuous zoom lens.
Further, the continuous zoom lens further comprises a zoom potentiometer group 11, the zoom potentiometer group 11 is fixed on the lens tube 1, and a potentiometer shaft of the zoom potentiometer group 11 is meshed with a gear at the end part of the zoom lens tube 2 for transmission. The potentiometer set 11 is mainly used for calibrating the rotation angle value of the zoom lens tube 2, and the positions of the zoom set 5 and the compensation set 6 are calibrated through calibrating the rotation angle value of the potentiometer set, so that the focal length value of the lens is calibrated.
Further, the continuous zoom lens further comprises an optical filter switching set 12 fixedly connected with the rear fixing set 7, wherein the optical filter switching set 12 comprises a visible light wave band optical filter and a near infrared wave band optical filter, and the optical filters can be switched under the driving of a motor and an electromagnetic valve.
Further, the continuous zoom lens further includes 4 micro switches 13 fixed on the lens tube 1. The micro switch is mainly used for limiting the focusing gear 3 and the zoom lens tube 2, and prevents the pin from moving to the tail end of the curve groove, so that the motors of the focusing motor group 9 and the zoom motor group 10 are blocked and damaged.
Furthermore, the lens tube 1, the zoom lens tube 2, the focusing gear 3 and the rear fixed group lens barrel are made of PEEK, and the whole lens tube is thickened to partially carry out weight reduction and chamfering; the lens frame of the objective lens group 4, the lens frame of the zoom group 5 and the lens frame of the compensation group 6 are all made of aviation aluminum materials.
Compared with the prior art, the invention has the following beneficial effects: (1) The structure and the material of the continuous zoom lens are optimized, and the quality and the volume of the lens are reduced as much as possible on the premise of ensuring the consistency of the optical axis stability and the optical axis, so that the continuous zoom lens is more convenient to carry; (2) Experiments show that the lens weight is only 230g (which is only 38 percent of the same type of all-aluminum alloy lens) when the focal length is 25mm-110mm, the optical axis consistency is 0.1mrad, and the optical axis stability after a high-low temperature vibration impact test is 0.08mrad; (3) The lens has light weight, small volume and good reliability, can be assembled on various handheld and vehicle-mounted photoelectric tracking and reconnaissance equipment, and has wide application.
Drawings
FIG. 1 is a front view of a progressive lens of the present invention;
FIG. 2 is a top view of the continuous zoom lens of the present invention;
FIG. 3 is a cross-sectional view of FIG. 2 (cross-section taken in a plane perpendicular to the plane of the paper and passing through the center line);
FIG. 4 is a schematic view of a mirror tube structure;
FIG. 5 is a schematic view of a zoom lens tube structure;
fig. 6 is a schematic view of a focusing gear structure.
The device comprises a 1-lens tube, a 2-zoom lens tube, a 3-focusing gear, a 4-objective lens group, a 5-zoom group, a 6-compensation group, a 7-rear fixed group, an 8-pin, a 9-focusing motor group, a 10-zoom motor group, a 11-zoom potentiometer group, a 12-optical filter switching group and a 13-micro switch.
Detailed Description
In order for those of ordinary skill in the art to fully understand the technical solutions and advantageous effects of the present invention, the following description is further given with reference to specific embodiments and drawings.
The PEEK-based ultra-light continuous zoom lens shown in fig. 1-6 mainly comprises a lens tube 1, a zoom lens tube 2, a focusing gear 3, an objective lens group 4, a zoom group 5, a compensation group 6, a rear fixing group 7, a pin 8, a focusing motor group 9, a zoom motor group 10, a zoom potentiometer group 11, an optical filter switching group 12 and a micro switch 13. The lens tube 1 consists of two cylinders with different diameters, a focusing straight line groove is arranged on the surface of a thicker cylinder, and a zooming straight line groove and a compensating straight line groove are arranged on a thinner cylinder. Two cam curve grooves (a variable-magnification cam curve groove and a compensation cam curve groove) are symmetrically arranged on the surface of the variable-magnification lens tube 2, and a gear is further arranged at one end of the variable-magnification lens tube. A focusing curve groove is formed in the surface of the focusing gear 3, and a half circle of gear is arranged at the end part of the focusing curve groove; the objective lens group 4, the magnification changing group 5, the compensating group 6 and the rear fixing group 7 all comprise a lens frame and an optical lens group fixed in the lens frame, and the optical filter switching group 12 comprises a visible light wave band optical filter, a near infrared wave band optical filter and a switching component.
During assembly, the variable magnification group 5 and the compensation group 6 are firstly arranged in the lens tube 1, then the variable magnification lens tube 2 is sleeved on the lens tube 1, and finally one end of the lens tube 1 is provided with the objective lens group 4, and the other end of the lens tube 1 is provided with the rear fixing group 7. The two groups of pins respectively pass through the two cam curve grooves on the zoom lens tube 2 and the zoom straight line groove and the compensation straight line groove on the lens tube 1 and are respectively fixedly connected with the zoom group 5 and the compensation group 6; the third group of pins pass through the focusing curve groove on the focusing gear 3 and the focusing straight groove on the lens tube 1 and then are fixedly connected with the objective lens group 4. The focusing motor group 9 and the zooming motor group 10 are fixed on the lens tube 1, and the output shafts of the focusing motor group and the zooming motor group are respectively meshed with a gear at the end part of the zooming lens tube and a focusing gear for transmission. When the zoom motor group 10 works, the zoom lens tube 2 is driven to rotate, the pin is driven to move along the cam curve groove, and the pin drives the zoom group 5 and the compensation group 6 to move back and forth along the corresponding straight line groove of the lens tube 1, so that continuous zooming of the lens is realized. When the focusing motor group 9 works, the focusing gear 3 is driven to rotate, the pin is driven to move along the focusing curve groove, and the pin drives the objective lens group 4 to move back and forth along the focusing straight line groove of the lens tube 1, so that micro focusing of the objective lens group 4 is realized. The focusing motor group 9 and the zooming motor group 10 are limited and protected through a micro switch fixed on the lens tube. The rear fixing group 7 is arranged at the tail part of the lens tube 1 and is mainly used for fine adjustment of the synthetic focal length of the continuous zoom lens system, so that the imaging of the system is ensured to fall on the image surface of the imaging lens. The outside of the rear fixed group 7 is also fixedly connected with an optical filter switching group 12, and the structure and the working principle of the optical filter switching group are as shown in the prior application CN111239991A or the 'large-view-field high-zoom-ratio continuous zoom lens based on double-group compensation'.
In order to reduce the weight of the product, the lens tube 1, the zoom lens tube 2, the focusing gear 3 and the rear fixed group lens barrel are made of PEEK materials, and the wall thickness of the lens tube and the wall thickness of the zoom lens tube are thickened so that the thinnest parts of the lens tube and the wall thickness of the zoom lens tube respectively reach 2.5mm and 2mm. In addition, the stress concentration position is subjected to rounding treatment, and the partial weight reduction treatment is performed. After analysis and calculation by simulation software, the deformation of the inner hole of the lens tube at high and low temperatures is smaller than 0.01mm, so that the consistency of the optical axis of the lens and the stability of the optical axis can be ensured to meet the technical index requirements; the deformation of the curve groove of the zoom lens tube is less than 0.02mm, and the design requirement is met. The weights of the actual molded lens tube 1 and the variable magnification lens tube 2 are only 27g and 16g respectively. Considering that the gaps between the objective lens group 4, the zoom lens group 5 and the compensation lens group 6 and the lens tube 1 also affect the consistency of the optical axis and the stability of the optical axis, and the length and the thickness of the lens are smaller, the lens frames of the objective lens group 4, the zoom lens group 5 and the compensation lens group 6 are all made of aluminum alloy for ensuring the stability of each lens frame. Because PEEK has self-lubricating property, the friction force between each mirror frame and the mirror tube is far smaller than that between the mirror frame and the mirror tube when the mirror tube is made of aluminum alloy materials.
The focal length of the continuous zoom lens reaches 25mm-110mm, the weight is only 230g, the consistency of the optical axis is 0.1mrad, and the stability of the optical axis after high-low temperature and vibration impact test is 0.08mrad.
Claims (3)
1. An ultralight continuous zoom lens based on PEEK, which is characterized in that: the continuous zoom lens comprises a lens tube (1), a zoom lens tube (2), a focusing gear (3), an objective lens group (4), a zoom lens group (5), a compensation group (6), a rear fixed group (7), a pin (8), a focusing motor group (9), a zoom motor group (10) and a zoom potentiometer group (11), wherein the lens tube (1), the zoom lens tube (2), the focusing gear (3) and a rear fixed group lens barrel are made of PEEK, the lens tube (1) and the zoom lens tube (2) are integrally thickened, meanwhile, the parts of the lens tube (1) and the zoom lens tube (2) are subjected to weight reduction and chamfering, and the thinnest parts of the lens tube (1) and the zoom lens tube (2) are respectively 2.5mm and 2mm; the lens frame of the objective lens group (4), the lens frame of the zoom group (5) and the lens frame of the compensation group (6) are all made of aviation aluminum materials;
the zoom lens system comprises a lens tube (1), a lens group (4), a rear fixed group (7) and a compensation group (6), wherein the zoom lens group (5) and the compensation group (6) are packaged in the lens tube (1), the zoom lens tube (2) is sleeved on the lens tube (1), and the lens group and the rear fixed group (7) are fixedly connected with two ends of the lens tube (1) respectively; the zoom potentiometer group (11) is fixed on the lens tube (1), and a potentiometer shaft of the zoom potentiometer group (11) is meshed with a gear at the end part of the zoom lens tube (2) for transmission; the focusing gear (3) is sleeved on the lens tube (1), and the focusing motor group (9) is fixed on the lens tube (1); the variable-magnification motor unit (10) is fixed on the lens tube (1), a gear is arranged at the end part of the variable-magnification lens tube (2), and an output shaft of the variable-magnification motor unit (10) is meshed with the gear at the end part of the variable-magnification lens tube (2) for transmission;
a cam curve groove is arranged on the zoom lens tube (2), and a straight line groove corresponding to the cam curve groove is arranged on the lens tube (1); the pin (8) passes through a cam curve groove on the zoom lens tube (2) and a straight line groove on the lens tube (1) and is respectively fixedly connected with the zoom group (5) and the compensation group (6); when the zoom lens tube (2) rotates, the pin (8) is driven to move along a cam curve groove on the zoom lens tube (2), and the pin (8) drives the zoom group (5) and the compensation group (6) to move back and forth in a straight line groove of the lens tube (1); a focusing straight line groove is arranged on the mirror tube (1), a linear focusing curve groove corresponding to the focusing straight line groove is arranged on the focusing gear (3), and an output shaft of the focusing motor group (9) is meshed with a gear on the focusing gear (3); the pin (8) passes through a linear focusing curve groove on the focusing gear (3) and a focusing straight line groove on the lens tube (1) and is fixedly connected with the objective lens group (4); the focusing motor group (9) drives the focusing gear (3) to rotate, the pin (8) is driven to move along the linear focusing curve groove, and the pin (8) drives the objective lens group (4) to move back and forth along the focusing straight groove of the lens tube;
the focal length of the ultra-light type continuous zoom lens is 25mm-110mm, the weight is 230g, the consistency of the optical axis reaches 0.1mrad, and the stability of the optical axis reaches 0.08mrad after a high-low temperature vibration impact test.
2. The PEEK-based ultra-light progressive lens of claim 1, wherein: the continuous zoom lens further comprises an optical filter switching group (12) fixedly connected with the rear fixed group (7), and the optical filter switching group (12) comprises a visible light wave band optical filter and a near infrared wave band optical filter.
3. The PEEK-based ultra-light progressive lens of claim 1, wherein: the continuous zoom lens further comprises a micro switch (13), wherein the micro switch (13) is fixed on the lens tube (1) and used for limiting the focusing gear (3) and the zoom lens tube (2).
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| CN202011063937.5A CN112099183B (en) | 2020-09-30 | 2020-09-30 | PEEK-based ultra-light continuous zoom lens |
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| CN113671686A (en) * | 2021-07-16 | 2021-11-19 | 河北汉光重工有限责任公司 | Infrared sighting telescope lightweight diopter adjustable eyepiece |
| CN114137779B (en) * | 2021-12-17 | 2022-12-30 | 东莞市宇瞳光学科技股份有限公司 | Zooming curve fitting method of focusing lens group and focusing lens barrel |
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| CN107765418A (en) * | 2017-09-29 | 2018-03-06 | 赛诺微医疗科技（浙江）有限公司 | The medical electronic endoscope of built-in light-source |
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| JP2009003073A (en) * | 2007-06-20 | 2009-01-08 | Hitachi Maxell Ltd | Camera module, pedestal mount, and imaging apparatus |
| TW200916870A (en) * | 2007-06-20 | 2009-04-16 | Hitachi Maxell | Lens module, camera module, and method of manufacturing camera module |
| US8429681B2 (en) * | 2007-09-06 | 2013-04-23 | Sanyo Electric Co., Ltd. | Optical disc apparatus which includes an optical pickup apparatus that includes an optical member driving apparatus |
| CN104849834B (en) * | 2015-06-03 | 2017-10-03 | 福建福光股份有限公司 | Medium wave infrared continuous zoom lens and its control method |
| CN106054363B (en) * | 2016-07-26 | 2018-06-15 | 福建福光股份有限公司 | High zoom ratio medium wave infrared continuous zoom lens and its method of work |
| CN106154524B (en) * | 2016-08-29 | 2018-12-07 | 浙江大华技术股份有限公司 | A kind of fog penetration lens and video camera |
| CN107765411B (en) * | 2017-11-14 | 2020-05-19 | 福建福光股份有限公司 | High-definition continuous zoom lens with large zoom ratio and strong fog penetration |
| CN108008518B (en) * | 2017-12-13 | 2020-08-11 | 湖北华中光电科技有限公司 | High-precision continuous zoom lens based on hyperbolic groove |
| CN211355403U (en) * | 2019-10-15 | 2020-08-28 | 中国科学院苏州生物医学工程技术研究所 | Zoom detection system for fluorescence imaging |
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| CN107765418A (en) * | 2017-09-29 | 2018-03-06 | 赛诺微医疗科技（浙江）有限公司 | The medical electronic endoscope of built-in light-source |
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