CN106990513B - Electric focusing type uncooled infrared telephoto lens and working method thereof - Google Patents
Electric focusing type uncooled infrared telephoto lens and working method thereof Download PDFInfo
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- CN106990513B CN106990513B CN201710323910.7A CN201710323910A CN106990513B CN 106990513 B CN106990513 B CN 106990513B CN 201710323910 A CN201710323910 A CN 201710323910A CN 106990513 B CN106990513 B CN 106990513B
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- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
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Abstract
The invention relates to an electric focusing type non-refrigeration infrared telephoto lens and a working method thereof, wherein the electric focusing type non-refrigeration infrared telephoto lens comprises a lens barrel, a front group A and a rear group B, lenses of the front group A are positive focal power, lenses of the rear group B are positive focal power, the lens barrel comprises a front main barrel and a rear barrel, the front group A is arranged in the front main barrel, a front pressing ring is arranged in the front main barrel, the rear group B is arranged in the rear barrel, a rear pressing ring for fixing the rear group B is arranged in the rear barrel, the rear barrel is sleeved in the rear end of the front main barrel and can move back and forth relative to the front main barrel, a rotating sleeve is sleeved outside the rear end of the front main barrel, a convex ring is arranged on the outer circumference of the rotating sleeve, tooth grooves are uniformly distributed on the outer circumference of the convex ring, a cam guide groove is arranged on the outer circumference of the rear barrel, a cam guide pin is vertically arranged in the front part of the convex ring, the lower end of the cam guide pin sequentially penetrates through the rotating sleeve and the front main barrel and then extends into the cam guide groove, and a focusing motor is arranged on the front main barrel.
Description
Technical Field
The invention relates to an electric focusing type uncooled infrared telephoto lens and a working method thereof.
Background
With the rapid development of scientific technology and the continuous development and the increasing maturity of the uncooled detector technology, the long-wave infrared uncooled optical system is widely applied to the military and civil fields. Since the infrared optical material and the mechanical material can generate thermal deformation when the temperature changes, the drastic change of the working temperature can cause the influences of the focal length change, the image plane drift, the imaging quality reduction and the like of the optical system. In order to eliminate or reduce the influence of temperature variation on the imaging of the optical system, a corresponding compensation technology must be adopted to keep the focal length of the optical system unchanged within a larger temperature difference range, so as to ensure good imaging quality.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the present invention is to provide an electric focusing type uncooled infrared telephoto lens and a working method thereof.
In order to solve the technical problem, the technical scheme of the invention is as follows: an electric focusing type uncooled infrared telephoto lens comprises a lens barrel and an optical system arranged in a main lens barrel, wherein the optical system comprises a front group A and a rear group B which are sequentially arranged along the incident direction of light from left to right, the front group A lens is positive focal power, the rear group B lens is positive focal power, the front group A is the front group A, the rear group B is the rear group B, the air space between the front group A and the rear group B is 43.94 to 45.94mm, the lens barrel comprises a front main barrel and a rear barrel, the front group A is arranged in the front main barrel, a front pressing ring for fixing the front group A is arranged in the front main barrel, the rear group B is arranged in the rear barrel, a rear pressing ring for fixing the rear group B is arranged in the rear barrel, the rear end of the front main barrel is sleeved with the rear barrel, the rear barrel can move back and forth relative to the front main barrel, a rotating sleeve is sleeved outside the rear end of the front main barrel, a convex ring is uniformly distributed on the periphery of the rotating sleeve, a cam tooth groove is arranged outside the rear barrel, a cam guide groove is arranged on the periphery of the cam, a cam groove, a cam guide pin penetrates through a cam and a cam shaft and is vertically arranged on the front end of the motor, and a cam guide pin is meshed with a motor.
Furthermore, a potentiometer is arranged beside the focusing motor and mounted on the front main barrel, and a shaft part of the potentiometer is provided with a fixed focus gear in meshing transmission with the tooth socket.
Furthermore, a limit position contact switch A and a limit position contact switch B are arranged on the front main cylinder, a positioning screw is arranged between the contact switch A and the contact switch B, and the positioning screw is arranged on the rotating sleeve.
Furthermore, a switching ring is arranged at the rear end of the rear cylinder and is fixed on the rear cylinder through screws.
An electric focusing type uncooled infrared telephoto lens working method comprises the following steps: the adjusting gear on the focusing motor drives the rotating sleeve to rotate, and meanwhile, the cam guide nail slides along the cam guide groove and drives the rear lens barrel to move back and forth to realize focusing.
Furthermore, the potentiometer outputs a pulse electrical signal while adjusting voltage and current, and when the pulse electrical signal reaches a preset position, the potentiometer obtains the electrical signal by adjusting the voltage, so that a fixed-focus gear on the potentiometer changes output torque force to be matched with a gear on a focusing motor to rotate, and the positioning effect is achieved.
Compared with the prior art, the invention has the following beneficial effects: the structure design is simple, compact and reasonable, and the air distance change between the lenses under different temperature conditions is realized to adjust the imaging performance of the optical system and obviously improve the optical imaging performance under different object distances through the matching of the motor and the potentiometer.
The invention is described in further detail below with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a schematic diagram of an optical system according to the present invention;
FIG. 2 is a schematic view of the overall construction of the present invention;
fig. 3 is a right side view of fig. 2.
In the figure:
a-front group A; b-rear group B; c-image plane; 1-front main cylinder; 2-a motor set; 3, cam guide nail; 4-rotating the sleeve; 5-a transfer ring; 6-front pressing ring; 7-rear cylinder; 8-back pressing ring; 9-a potentiometer; 10-contact switch a; 11-a set screw; 12-contact switch B.
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1 to 2, an electric focusing type uncooled infrared telephoto lens includes a lens barrel and an optical system arranged in the main lens barrel, the optical system includes a front group a and a rear group B sequentially arranged along a left-to-right incident direction of light, the front group a lens has positive focal power, the rear group B lens has positive focal power, the front group a is a front group a, the rear group B is a rear group B, an air space between the front group a and the rear group B is 43.94 to 45.94mm, the lens barrel includes a front main barrel and a rear barrel, the front group a is arranged in the front main barrel, a front press ring for fixing the front group a is arranged in the front main barrel, the rear group B is arranged in the rear barrel, a rear pressing ring used for fixing the rear group B is arranged in the rear barrel, the rear barrel is sleeved at the rear end of the front main barrel, the rear barrel can move back and forth relative to the front main barrel, a rotating sleeve is sleeved outside the rear end of the front main barrel, a convex ring is arranged on the peripheral ring of the rotating sleeve, tooth grooves are uniformly distributed on the periphery of the convex ring, a cam guide groove is formed in the periphery of the rear barrel, a cam guide nail is vertically arranged in the front of the convex ring, the lower end of the cam guide nail penetrates through the rotating sleeve and the front main barrel in sequence and then extends into the cam guide groove, a focusing motor is arranged on the front main barrel, and an output shaft of the focusing motor is provided with an adjusting gear which is meshed with the tooth grooves for transmission.
In the embodiment, in order to prevent the convex ring from rotating without reason after the focusing is finished, a potentiometer is arranged beside the focusing motor and used for positioning the focal length, the potentiometer is arranged on the front main barrel, and a shaft part of the potentiometer is provided with a fixed focus gear which is in meshing transmission with the tooth socket.
In this embodiment, be provided with extreme position contact switch A, extreme position contact switch B on the preceding main section of thick bamboo, be provided with set screw between contact switch A, the contact switch B, set screw sets up on rotating the cover, when the bulge loop rotated two extreme positions, need make motor stop work through set screw touching contact switch.
In this embodiment, the rear end of the rear cylinder is provided with an adapter ring, the adapter ring is fixed on the rear cylinder through screws, and the adapter ring is provided with a thread tooth of M34X0.75-6g to be matched with the camera.
A working method of an electric focusing type uncooled infrared telephoto lens comprises the following steps: the adjusting gear on the focusing motor drives the rotating sleeve to rotate, and meanwhile, the cam guide nail slides along the cam guide groove and drives the rear lens barrel to move back and forth to realize focusing.
In this embodiment, the potentiometer is used for outputting a pulse electrical signal while adjusting voltage and current, and when the potentiometer reaches a predetermined position, the potentiometer obtains the electrical signal by adjusting the voltage (power off or changing the magnitude of the voltage), so that the fixed-focus gear on the potentiometer changes the output torque to cooperate with the gear on the focusing motor to rotate, thereby playing a role in positioning (for example, when the motor is powered off, the potentiometer receives the electrical signal, and increases the torque in time to stop the motor immediately and maintain the motor at the predetermined position).
In the present embodiment, the optical system constituted by the lens group achieves the following optical indexes: relative pore diameter F:1.0; resolution ratio: can be adapted with a 640 x 512 μm detector camera; the total length sigma of the optical path is less than or equal to 68.49mm, and the optical back intercept l' is more than or equal to 11.53mm; applicable spectral line range: 8-12 μm;
the lens parameters were as follows:
the specific surface type equation of the aspheric surface is as follows:
s2 c =1/R, R =59.233, k =0, A0=0, A1=8.349E-008, A2=4.285E-011, A3= -2.035E-014;
s3 c =1/R, R =25.235, k =0, A0=0, A1= -7.565E-008, A2=1.617E-009, A3= -6.345E-011, A4=1.247E-013.
During optical design, aberration correction and balance are carried out on a wide spectral range of 8-12 mu m, so that the lens has excellent image quality in the wide spectral range, wide-spectrum confocal is realized, and the lens can clearly image in a medium-long wave range; the optical glass material with high refraction and low dispersion is selected, and various aberrations of the optical lens are corrected through design and optimization, so that the lens has the advantages of high resolution, large relative aperture, low distortion and the like; the distortion is small, is less than 1%, and is better controlled relative to the distortion of an old structure; when the structure is designed, the concentricity, the precision and the axial position of the lens are ensured to be accurate, and the structure of the lens is compact and beautiful as much as possible; the imaging performance of the optical system is adjusted by changing the air distance between the lenses under different temperature conditions and the optical imaging performance is obviously improved under different object distances by matching the motor set and the potentiometer set.
The present invention is not limited to the above-described preferred embodiments, and any one can obtain various other types of electrically focusing uncooled infrared telephoto lenses and methods for operating the same, based on the teaching of the present invention. All equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (6)
1. The utility model provides an infrared telephoto type camera lens of electronic focusing formula uncooled which characterized in that: the lens barrel comprises a front main barrel and a rear lens group, the front lens group A is positive focal power, the rear lens group B is positive focal power, the air interval between the front lens group A and the rear lens group B is 43.94 to 45.94mm, the lens barrel comprises a front main barrel and a rear lens group barrel, the front lens group A is arranged in the front main barrel, a front pressing ring for fixing the front lens group A is arranged in the front main barrel, the rear lens group B is arranged in the rear lens group barrel, a rear pressing ring for fixing the rear lens group B is arranged in the rear lens group barrel, the rear end of the front main barrel sleeves the rear lens group barrel, the rear lens group barrel can move back and forth relative to the front main barrel, a rotating sleeve is sleeved outside the rear end of the front main barrel, a convex ring is arranged on the periphery of the rotating sleeve, a convex ring is uniformly distributed on the periphery of the convex ring, a cam is arranged on the periphery of the rear lens group barrel, a convex ring is arranged on the periphery of the rear main barrel, a cam is arranged on the front end of the cam, a front guide groove and a motor is arranged on the front guide pin and a motor, and a focusing pin is arranged on the front guide groove and a motor, and a focusing pin is meshed with a motor;
the thickness of the front group A lens is 6.1 mm, and the material is germanium;
the thickness of the rear group B lens is 5.23 mm, and the material is germanium;
the curvature radius of the object side surface of the front group A lens is 51.23mm, and the image side surface of the front group A lens is an aspheric surface;
the object side surface of the rear group B lens is an aspheric surface, and the curvature radius of the image side surface is 27.4mm;
the aspheric curve equation is as follows:
wherein the front group a lens image side values are c =1/R, R =59.233, k =0, A0=0, A1=8.349E-008, A2=4.285E-011, A3= -2.035E-014;
wherein the values of the object side of the lenses of the rear group B were c =1/R, R =25.235, k =0, A0=0, A1= -7.565E-008, A2=1.617E-009, A3= -6.345E-011, A4=1.247E-013.
2. An electrically focusing uncooled infrared telephoto type lens according to claim 1, wherein: the focusing motor side is provided with the potentiometre, and the potentiometre is installed on the main section of thick bamboo in front, and the axial region of potentiometre is provided with the fixed focus gear with tooth's socket meshing transmission.
3. An electrically focusing uncooled infrared telephoto type lens according to claim 2, wherein: the front main cylinder is provided with a limit position contact switch A and a limit position contact switch B, a positioning screw is arranged between the contact switch A and the contact switch B, and the positioning screw is arranged on the rotating sleeve.
4. An electrically focusing uncooled infrared telephoto type lens according to claim 3, wherein: the rear end of the rear group lens barrel is provided with a switching ring, and the switching ring is fixed on the rear group lens barrel through screws.
5. An operating method of an electrically-focused uncooled infrared telephoto lens, which employs the electrically-focused uncooled infrared telephoto lens of claim 4, and is characterized in that: the adjusting gear on the focusing motor drives the rotating sleeve to rotate, meanwhile, the cam guide nail slides along the cam guide groove, and the cam guide nail drives the rear group lens barrel to move back and forth to realize focusing.
6. The method of claim 5, wherein the step of operating the electronic focusing uncooled infrared telephoto type lens includes: the potentiometer outputs a pulse electrical signal when adjusting voltage and current, and when reaching a preset position, the potentiometer obtains the electrical signal by adjusting the voltage, so that a focusing gear on the potentiometer changes output torque to cooperate with an adjusting gear on a focusing motor to rotate, and the positioning effect is achieved.
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| CN201710323910.7A CN106990513B (en) | 2017-05-10 | 2017-05-10 | Electric focusing type uncooled infrared telephoto lens and working method thereof |
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| CN107390349B (en) * | 2017-08-30 | 2020-05-19 | 福建福光股份有限公司 | Long-wave refrigeration type athermalization lens |
| CN107479174A (en) * | 2017-09-02 | 2017-12-15 | 福建福光股份有限公司 | A kind of LONG WAVE INFRARED optical system |
| CN107505685A (en) * | 2017-09-29 | 2017-12-22 | 福建福光天瞳光学有限公司 | Electromotion focusing LONG WAVE INFRARED camera lens and its method of work |
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| JPS5827109A (en) * | 1981-08-10 | 1983-02-17 | Olympus Optical Co Ltd | Distance controller for camera |
| CN106094182B (en) * | 2016-08-26 | 2018-06-12 | 福建福光股份有限公司 | The strong Penetrating Fog high definition zooming camera lens of folded form |
| CN106094174A (en) * | 2016-08-26 | 2016-11-09 | 福建福光天瞳光学有限公司 | Far infrared long wave dolly-out,s dolly-back high mist transmitting without transconversion into heat camera lens and preparation method thereof |
| CN106443991B (en) * | 2016-12-16 | 2019-01-29 | 福建福光天瞳光学有限公司 | A kind of long drive type LONG WAVE INFRARED motorized zoom lens and its working method |
| CN106483644B (en) * | 2016-12-16 | 2018-11-16 | 福建福光股份有限公司 | 38 times of super large zoom ratio Size Zoom TV camera lens |
| CN207020388U (en) * | 2017-05-10 | 2018-02-16 | 福建福光天瞳光学有限公司 | Electromotion focusing formula uncooled ir is dolly-out,ed dolly-back type camera lens |
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