CN111965780A - Clearance-eliminating type double-field-of-view infrared thermal imaging lens and using method thereof - Google Patents
Clearance-eliminating type double-field-of-view infrared thermal imaging lens and using method thereof Download PDFInfo
- Publication number
- CN111965780A CN111965780A CN202010839849.3A CN202010839849A CN111965780A CN 111965780 A CN111965780 A CN 111965780A CN 202010839849 A CN202010839849 A CN 202010839849A CN 111965780 A CN111965780 A CN 111965780A
- Authority
- CN
- China
- Prior art keywords
- zoom
- variable
- driven wheel
- spring
- lens
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
The invention provides a gap-eliminable double-field infrared thermal imaging lens and a using method thereof, and the adopted scheme is as follows: the variable-power driven wheel comprises a variable-power group and a post-fixing group which are connected together in a matching mode, wherein the variable-power group comprises a variable-power lens barrel and a variable-power driven wheel, the variable-power driven wheel is installed at the rear part of the variable-power lens barrel and can rotate around a central shaft of the variable-power lens barrel, an anti-backlash mechanism and a motor are installed on the post-fixing group, a driving gear is installed on the motor and meshed with the variable-power driven wheel, the anti-backlash mechanism comprises a constant-force spring, a spring rotating shaft and a spring guiding assembly, the constant-force spring is wound on the spring rotating shaft, the extending end of the constant-force spring is connected to the variable-power driven wheel, the constant-force spring is wound around the spring guiding assembly and plays a tensioning role on the constant-force spring by the spring guiding assembly, and when. The effect of keeping the image clear after impact is achieved.
Description
Technical Field
The invention relates to the field of thermal infrared imaging lenses, in particular to a gap-eliminable double-field thermal infrared imaging lens and a using method thereof.
Background
In recent years, with the development of infrared detection technology, the infrared thermal imaging lens is widely applied to the military and civil fields, and compared with a single-view-field infrared thermal imaging lens with fixed focal length, the double-view-field infrared thermal imaging lens can realize target search of a wide view field and target identification and tracking of a narrow view field; compared with the continuous zoom infrared thermal imaging lens, the imaging lens number is reduced, so that the cost can be effectively reduced, and the design period is short. Due to the advantages of dual-field thermal imaging, the dual-field thermal imaging system is more and more widely applied to the field of observation and aiming.
The patent with application number 201610699315.9 discloses a long-wave infrared large-target-surface double-view-field zoom lens and a zooming method thereof, wherein a motor drives a zoom cam to rotate correspondingly, a zoom curve groove and a zoom guide pin assembly drive a zoom carriage to move according to the mode of the zoom curve groove, and under the restriction of a straight groove, the rotary motion of the zoom carriage is changed into linear motion to zoom. The lens has high requirements on the processing precision of parts, and the structure of a transmission link is complicated, so that the production and assembly efficiency is low. Due to the inevitable existence of machining errors and the rotation clearance of the output shaft of the driving motor, the double-field thermal imaging lens with the structure is easy to generate virtual focus when being used in a strong vibration impact environment. While the 202010256666.9 patent provides a solution, it is somewhat deficient and does not solve this problem well.
The problem commonly existing in the existing double-field thermal imaging products in the market at present is solved, and therefore the problem of developing a double-field thermal imaging lens which is simple and compact in structure and can keep clear images after impact becomes a difficult problem to be solved urgently.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides the anti-backlash double-field thermal infrared imaging lens which can keep clear images after impact.
The technical scheme adopted by the invention for solving the technical problems is as follows: an anti-backlash double-field infrared thermal imaging lens comprises a zoom group and a rear fixed group which are connected together in a matching way, the zooming group comprises a zooming lens cone and a zooming driven wheel, the zooming driven wheel is arranged at the rear part of the zooming lens cone and can rotate around the central shaft of the zooming lens cone, the rear fixed group is provided with a clearance eliminating mechanism and a motor, a rotating shaft of the motor is provided with a driving gear, the driving gear is meshed with the variable-power driven wheel, the anti-backlash mechanism comprises a constant-force spring, a spring rotating shaft and a spring guide assembly, the constant force spring is wound on the spring rotating shaft, the extending end of the constant force spring is connected to the variable-power driven wheel, the constant-force spring bypasses the spring guide assembly and plays a tensioning role for the constant-force spring by the spring guide assembly, when the variable-power driven wheel rotates, the variable-power driven wheel can be subjected to tangential tension by virtue of the resilience force of the constant-force spring. The driving gear is meshed with the variable-power driven wheel, the rotation precision is improved by utilizing gear driving to ensure the variable-power precision, the constant-force spring is tensioned by the spring guide assembly, the tangential tension applied to the variable-power driven wheel by the constant-force spring is increased, the tooth profile of the driving wheel is always in unilateral contact with the tooth profile of the variable-power driven wheel in the transmission process, so that the gap of a motor output shaft, the gear meshing gap, the possible matching gap between a variable-power driven wheel clamping groove and a variable-power driving rod and the possible matching gap between a sliding rod assembly and a cam curve groove are eliminated, the variable-power lens assembly can be instantly restored to the original position after being impacted, and the system can always keep clear images after being impacted.
Furthermore, the rear fixing group comprises a rear lens cone, a flange used for connecting the zoom group is arranged at the front part of the rear lens cone, the motor is fixed on the rear lens cone through a motor fixing frame, the driving gear is fixed at the shaft outlet end of the motor, and the spring rotating shaft and the spring guiding assembly are both arranged on the flange.
Furthermore, internal teeth are arranged on the variable-power driven wheel, one side, provided with the internal teeth, of the variable-power driven wheel protrudes out of the flange of the rear lens barrel and is located behind the flange, and the driving gear is meshed with the internal teeth. The meshing connection of the driving gear and the variable-power driven wheel is realized, and a foundation is provided for the installation and the work of the constant-force spring.
Further, the spring rotating shaft penetrates through a center hole of the constant force spring and then is fixedly connected to the flange, an avoiding groove is formed in the rear portion of the variable-power driven wheel, and the extending end of the constant force spring is stretched to penetrate through the avoiding groove and is connected to the outer side face of the variable-power driven wheel. The rear part of the variable-power driven wheel is provided with incomplete internal teeth (non-whole circumference type internal tooth structure), and the avoidance groove is formed, so that the constant-force spring can penetrate through the outer cylindrical surface of the variable-power driven wheel to be connected with the outer cylindrical surface of the variable-power driven wheel in a non-inclined state, and tangential force can be provided for the variable-power driven wheel.
Further, clockwork spring direction subassembly includes clockwork spring direction pivot, antifriction bearing and direction space ring, the direction space ring suit is in clockwork spring direction pivot, antifriction bearing's inner circle suit is in the direction pivot, antifriction bearing's outer lane and the medial surface contact of constant force clockwork spring, separate through the direction space ring between two upper and lower antifriction bearing, the direction space ring is connected the inner circle that makes antifriction bearing with two adjacent antifriction bearing's inner circle and is not rotated relatively with the direction pivot. The space ring has the effects that the inner rings of all the bearings are connected and do not rotate relative to the rotating shaft, after the rotating shaft is screwed down, the rotating shaft, the inner rings of the bearings and the space ring form a whole and are fixed, and the friction between the outer ring of the rolling bearing and the side face of the constant-force spring is rolling friction, so that the friction force during transmission is reduced, and the service life of the constant-force spring is prolonged.
Furthermore, the zoom group further comprises a sliding sleeve, a sliding rod assembly and a zoom lens assembly, the sliding sleeve is mounted inside the zoom lens barrel and can rotate around the central shaft of the zoom lens barrel in the zoom lens barrel, the zoom lens assembly is mounted in the sliding sleeve, the sliding rod assembly penetrates through the zoom lens barrel and the sliding sleeve and then is connected with the zoom lens assembly, and a sliding sleeve check ring used for limiting the axial movement of the sliding sleeve is mounted at the front end of the zoom lens barrel.
Furthermore, a cam curve groove for realizing the movement track of the lens is arranged on the cylindrical surface of the sliding sleeve, a front-back linear groove is arranged on the cylindrical surface of the front part of the zoom lens barrel, and a circumferential linear groove is arranged on the cylindrical surface of the rear end of the zoom lens barrel; the zoom lens component is arranged in the inner cavity of the sliding sleeve, the sliding rod component passes through the linear groove in the front of the zoom lens barrel and the cam curve groove of the sliding sleeve and then is arranged on the corresponding threaded hole of the zoom lens component, and the zoom lens component can move back and forth in the sliding sleeve to realize the field switching of the lens.
Furthermore, a zooming driving rod is installed on the sliding sleeve, the zooming driving rod penetrates through a linear groove at the rear end of the zooming lens barrel and then is installed on a threaded hole of the sliding sleeve, a clamping groove is formed in the inner wall of the zooming driven wheel, and the clamping groove is sleeved on the zooming driving rod; and the zoom lens barrel is also provided with a left limiting assembly and a right limiting assembly.
Furthermore, a limiting rod is installed on the front end face of the variable-power driven wheel, when the variable-power driven wheel rotates to the limit positions at the two ends, the limiting rod just presses the micro switch, the power supply of the driving motor can be cut off in time, and the motor is prevented from being locked.
Furthermore, the infrared refrigeration machine further comprises a front fixing group and an infrared uncooled core group, wherein the front fixing group, the zooming group, the rear fixing group and the infrared uncooled core group are sequentially connected from front to back.
Furthermore, the uncooled infrared core set comprises a thermal image core, and the thermal image core is electrically connected with the stepping motor and the microswitch.
Further, preceding fixed group, zoom group, back fixed group do not install the lens subassembly, and the lens subassembly includes lens, O type circle, clamping ring and packing ring, be provided with the lens mounting groove in the packing ring, lens pass through the lens mounting groove embedding in the packing ring, O type circle sets up in the lens outside, the clamping ring is fixed with lens locking through O type circle.
In addition, the invention also provides a using method of the infrared thermal imaging lens, which comprises the infrared thermal imaging lens, when the infrared thermal imaging lens is used, after the infrared camera core receives a view field switching instruction, the position parameter of a target view field is called, the direct current motor is started and controlled to rotate, the driving gear drives the zoom driven wheel to rotate in a certain circumferential range, the zoom driving rod drives the sliding sleeve to rotate in the zoom lens barrel, and the sliding sleeve can drive the zoom lens component to move back and forth in the inner cavity of the sliding sleeve according to a certain movement track while rotating, so that the view field switching is finally completed; when the lens finishes the field switching, the limiting rod just can compress the blocking piece of the microswitch, and the power supply of the direct current motor is cut off in time.
According to the technical scheme, the invention has the following advantages:
after the lens is impacted, due to the existence of mechanical gaps, the impact force can cause slight position deviation of the zoom lens assembly in the sliding sleeve along the optical axis direction, and the lens deviates from the theoretical position, so that imaging blurring is caused. Therefore, the clearance-eliminating type double-view-field infrared thermal imaging lens and the using method thereof have the advantages that the effect of tensioning the constant-force spring is achieved through the spring guide assembly, the tangential tension applied to the variable-power driven wheel by the constant-force spring is increased, the tooth profiles of the driving wheel and the variable-power driven wheel are in unilateral contact all the time in the transmission process, the gap of the output shaft of the motor, the gear meshing gap, the possibly existing fit gap between the clamping groove of the variable-power driven wheel and the variable-power driving rod and the possibly existing fit gap between the sliding rod assembly and the cam curve groove are eliminated, the variable-power lens assembly can be instantly restored to the original position after being impacted, and the system can be ensured to always keep clear images after being impacted.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a sectional view showing an internal structure and an assembly relationship according to an embodiment of the present invention.
Fig. 3 is an exploded view of the front set of fig. 1.
Fig. 4 is an exploded view of the construction of the zoom lens assembly of fig. 2.
Fig. 5 is an exploded view of the structure of the assembling relationship between the zoom lens assembly and the zoom lens barrel and the sliding sleeve.
Fig. 6 is an exploded view of the structure of the assembly relationship among the variable-power driven wheel, the limiting component and the variable-power lens barrel.
Fig. 7 is an exploded view of the structure of the variable-magnification left limit assembly in fig. 6.
Fig. 8 is an exploded view of the construction of the variable right limit assembly of fig. 6.
Fig. 9 is an exploded view of the structure of the rear set of fig. 2.
Fig. 10 is an exploded view of the structure of the driving motor assembly of fig. 1.
Fig. 11 is an exploded view of the construction of the spring guide assembly of fig. 2.
Fig. 12 is an exploded view of the structure of the sliding rod assembly of fig. 2.
In the figure, 1-front fixed group, 2-variable-magnification group, 3-rear fixed group, 4-non-refrigeration infrared camera core group, 5-driving motor component, 6-base, 7-sliding rod component, 8-machine core fixing component, 9-infrared machine core, 10-front lens cone, 11-first lens, 12-first pressure ring, 13-first O-shaped ring, 14-first gasket, 15-variable-magnification lens cone, 16-sliding sleeve, 17-sliding sleeve check ring, 18-variable-magnification lens component, 19-rotating shaft of rotating spring, 20-constant-force spring, 21-spring guide component, 22-variable-magnification frame, 23-second pressure ring, 24-second O-shaped ring, 25-second gasket, 26-second lens, 27-variable-magnification driving rod, 28-variable-magnification left limit component, 29-a variable-power right limit component, 30-a variable-power driven wheel, 31-a limit rod, 32-a limit plate, 33-a microswitch, 34-a third lens, 35-a third O-shaped ring, 36-a third pressure ring, 37-a third gasket, 38-a rear lens barrel, 39-a fourth gasket, 40-a fourth O-shaped ring, 41-a fourth pressure ring, 42-a fourth lens, 43-a direct current motor, 44-a motor fixing frame, 45-a driving gear, 46-a spring guide rotating shaft, 47-a rolling bearing, 48-a guide space ring, 49-a sliding rod, 50-a miniature bearing and 51-a space ring.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the present embodiment, and it is apparent that the embodiments described below are only a part of embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.
Detailed description of the preferred embodiment 1
As shown in attached drawings 1 and 2, the invention provides a gap-eliminable double-view-field infrared thermal imaging lens, which comprises a front fixing group 1, a zoom group 2, a rear fixing group 3 and an uncooled infrared core group 4, wherein the front fixing group 1, the zoom group 2, the rear fixing group 3 and the uncooled infrared core group 4 are sequentially connected and fixed to form the double-view-field infrared thermal imaging lens.
The front fixing group 1 comprises a front lens barrel 10, a first lens 11, a first pressing ring 12, a first O-shaped ring 13 and a first gasket 14.
The zooming group comprises a base 6, a sliding rod component 7, a zooming lens barrel 15, a sliding sleeve 16, a sliding sleeve retainer ring 17, a zooming lens component 18, a zooming driving rod 27, a zooming left limiting component 28, a zooming right limiting component 29, a zooming driven wheel 30 and a limiting rod 31.
As shown in fig. 5 and fig. 6, the sliding sleeve 16 is installed inside the zoom lens barrel 15 and can rotate inside the zoom lens barrel 15; a cam curve groove for realizing the movement track of the lens is arranged on the cylindrical surface of the sliding sleeve 16; the sliding sleeve retainer ring 17 is arranged at the front end of the zoom lens barrel 15 and used for limiting the axial movement of the sliding sleeve 16; the cylindrical surface at the front part of the zoom lens barrel 15 is provided with a straight line groove in the front-back direction, and the cylindrical surface at the rear end is provided with a straight line groove in the circumferential direction; the zoom lens assembly 18 is arranged in the inner cavity of the sliding sleeve 16, the sliding rod assembly 7 passes through the linear groove of the zoom lens barrel 15 and the cam curve groove of the sliding sleeve 16 and then is arranged on the corresponding threaded hole of the zoom lens assembly 18, and the zoom lens assembly can move back and forth in the sliding sleeve to realize the field switching of the lens; the zooming driving rod 27 passes through a linear groove at the rear end of the zooming lens barrel 15 and then is installed on a threaded hole of the sliding sleeve 16; the zooming driven wheel 30 is sleeved at the rear end of the zooming lens barrel 15 and can rotate around the central shaft of the zooming lens barrel 15; the inner wall of the variable-power driven wheel 30 is provided with a rectangular clamping groove, and the clamping groove is just sleeved on the variable-power driving rod 27. The front end face of the variable-power driven wheel 30 is provided with a threaded hole for installing a limiting rod 31. The cylindrical surface of the zoom lens barrel 15 is provided with a limit component fixing threaded hole, and a zoom left limit component 28 and a zoom right limit component 29 are respectively installed on the limit component fixing threaded hole.
As shown in fig. 4, the variable power lens assembly 18 includes a variable power lens holder 22, a second lens 26, a second pressing ring 23, a second gasket 25, and a second O-ring 24, wherein the second lens 26 is fixed in the same manner as the first lens 11, the second lens 26 is embedded in a lens mounting groove of the second gasket 25, the second O-ring 24 is disposed on the outer side of the second lens 26, the second lens 26 is locked and fixed by the second pressing ring 23, and the second O-ring 24 and the second gasket 25 are made of the same material as the first O-ring 13 and the first gasket 14, respectively.
As shown in fig. 7 and 8, the variable-magnification left limit assembly 28 and the variable-magnification right limit assembly 29 use the same components, and the microswitch 33 is fixed to the side surface of the limit plate 32 by screws, only the installation direction of the microswitch 33 relative to the limit plate 32 is different. The variable-magnification left limit component 28 and the variable-magnification right limit component 29 are used in pairs.
As shown in fig. 12, the sliding rod assembly 7 includes a sliding rod 49, two micro bearings 50, and two spacers 51, wherein the micro bearings 50 and the spacers 51 are mounted on the sliding rod 49 in a spaced manner. The miniature bearing and the space ring are sleeved on the sliding rod, the inner ring of the miniature bearing is in interference connection with the sliding rod and does not rotate relatively, and the friction between the outer ring of the miniature bearing and the side face of the cam curve groove is rolling friction, so that the transmission resistance is reduced.
Further, the base 6 is mounted at the bottom of the magnification-varying lens barrel 15.
As shown in fig. 9, the rear fixing group 3 includes a rear barrel 38, a third lens 34, a third pressing ring 36, a third gasket 37, a third O-ring 35, a fourth lens 42, a fourth pressing ring 41, a fourth gasket 39, and a fourth O-ring 40, the third lens 34 is fixed to the front end of the rear fixing group 3, the fourth lens 42 is fixed to the rear end thereof, the fixing manner of the third lens 34 and the rear end thereof is the same as that of the first lens 11, the material of the third gasket 37 and the material of the fourth gasket 39 are the same as that of the first gasket 14, and the material of the third O-ring 35 and the fourth O-ring 40 is the same as that of the first O-ring 13.
As shown in fig. 1, a driving motor assembly 5 is mounted on an upper portion of an outer cylindrical surface of the rear barrel 38, as shown in fig. 10, the driving motor assembly 5 includes a dc motor 43, a motor fixing frame 44 and a driving gear 45, the dc motor 43 is mounted in a mounting groove of the motor fixing frame 44 through a fastening screw, and the driving gear 45 is fixedly mounted at an output shaft end of the dc motor 43 through the fastening screw. After the driving motor assembly 5 is mounted on the corresponding hole position of the outer cylindrical surface of the rear lens barrel 38, the driving gear 45 is meshed with the variable-power driven wheel 30, and the variable-power driven wheel 30 is driven to rotate within a certain circumferential range.
As shown in fig. 2, a gap eliminating mechanism is mounted on the flange of the rear barrel 38, the gap eliminating mechanism includes a constant force spring 20, a spring rotating shaft 19 and a spring guiding assembly 21, the spring rotating shaft 19 passes through a central hole of the constant force spring 20 and then is mounted on the flange of the rear barrel 38, the constant force spring 20 can rotate around the spring rotating shaft 19, and an extending end of the constant force spring 20 is fixed on a mounting hole of the variable-power driven wheel 30 after being stretched. Spring guide assembly 21 is attached to the flange of rear barrel 38 and acts to tension constant force spring 20 and increase the tangential tension applied by constant force spring 20 to variable ratio driven wheel 30. The tooth profiles of the driving gear and the variable-power driven gear are in unilateral contact all the time in the transmission process, so that the clearance of a motor output shaft, the gear meshing clearance, the possible fit clearance between the variable-power driven gear clamping groove and the variable-power driving rod and the possible fit clearance between the sliding rod assembly and the cam curve groove are eliminated.
As shown in fig. 11, the spring guide assembly 21 includes a spring guide rotating shaft 46, a rolling bearing 47 and a guide spacer 48, and the rolling bearing 47 and the guide spacer 48 are sleeved on the spring guide rotating shaft 46 at intervals in pairs. The inner ring of the rolling bearing is in interference connection with the spring guide rotating shaft and does not rotate relatively, friction between the outer ring of the rolling bearing and the side face of the constant force spring is rolling friction, friction force during transmission is reduced, and the service life of the constant force spring is prolonged.
The uncooled infrared motor core set 4 comprises a core fixing piece 8 and an infrared core 9, wherein the infrared core 9 is installed at the rear end of the rear fixing set 3 through the core fixing piece 8, the infrared core 9 is electrically connected with a direct current motor 43 and a microswitch 33, and functions of data acquisition, view field switching control, image processing and the like are integrated. Since the technology of the infrared movement is mature, it is not described herein again.
Wherein, all lenses encircle fixedly by O type circle and packing ring, and O type circle adopts the silica gel material, has the effect of damping and buffering to lens, and the packing ring adopts polyformaldehyde engineering plastics, can not only effectively guarantee lens axial and radial installation accuracy, possesses reliable shock resistance moreover.
Due to the influence of part machining precision and the limitation of production and assembly level, various fit clearances can exist among parts of the assembled infrared thermal imaging lens, such as a return difference of an output shaft of the direct current motor 43, a gear meshing clearance, a fit clearance possibly existing between the rectangular clamping groove of the zoom driven wheel 30 and the zoom driving rod 27, a fit clearance possibly existing between the sliding rod assembly 7 and a cam curve groove arranged on the sliding sleeve 16, and the like. When the infrared thermal imaging lens is impacted, the impact force can cause slight position deviation of the zoom lens assembly 18 in the sliding sleeve 16 along the optical axis direction due to the existence of the mechanical clearance, and the second lens 26 deviates from the theoretical position, thereby causing imaging blurring. The backlash eliminating mechanism provided by the invention can enable the variable-power driven wheel 30 to always bear tangential tension by virtue of the resilience force of the constant-force spring 20 after the variable-power lens assembly 18 generates axial position deviation, so that the tooth profile of the driving gear 45 and the variable-power driven wheel 30 is always in unilateral contact in the transmission process, the variable-power lens assembly 18 can be instantly restored to the original position after being impacted, and the system can be ensured to always keep clear images after being impacted.
Detailed description of the preferred embodiment 2
After the infrared camera core 9 receives a view field switching instruction, position parameters of a target view field are retrieved, the direct current motor 43 is started and controlled to rotate, the driving gear 45 drives the zoom driven wheel 30 to rotate within a certain circumferential range, the zoom driving rod 27 drives the sliding sleeve 16 to rotate in the zoom lens barrel 15, the sliding sleeve 16 rotates, and meanwhile, the zoom lens assembly 17 is driven to move back and forth in the inner cavity of the sliding sleeve 16 according to a certain movement track, and finally the view field switching is completed. When the lens finishes the field switching, the limiting rod 31 just compresses the blocking piece of the microswitch 33, the power supply of the direct current motor 43 is cut off in time, and the direct current motor 43 is prevented from being damaged due to rotation blockage.
The terms "upper", "lower", "outside", "inside", and the like in the description and claims of the present invention and the above-described drawings (if any) are used for distinguishing relative positions without necessarily being construed qualitatively. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The double-view-field infrared thermal imaging lens capable of eliminating backlash comprises a zoom group (2) and a rear fixing group (3) which are connected with each other in a matching mode, and is characterized in that the zoom group (2) comprises a zoom lens barrel (15) and a zoom driven wheel (30), the zoom driven wheel (30) is mounted at the rear part of the zoom lens barrel (15) and can rotate around the central shaft of the zoom lens barrel (15), an anti-backlash mechanism and a motor (43) are mounted on the rear fixing group (3), a driving gear (45) is mounted on a rotating shaft of the motor (43), the driving gear (45) is meshed with the zoom driven wheel (30) and is connected with the zoom driven wheel, the anti-backlash mechanism comprises a constant force spring (20), a spring rotating shaft (19) and a spring guiding assembly (21), the constant force spring (20) is wound on the spring rotating shaft (19), and the extending end of the constant force spring (20) is connected to the zoom driven wheel (30), the constant-force spring (20) bypasses the spring guide assembly (21) and plays a tensioning role for the constant-force spring (20) through the spring guide assembly (21), and when the variable-power driven wheel (30) rotates, the variable-power driven wheel (30) can be subjected to tangential tension through the resilience force of the constant-force spring (20).
2. The double-field thermal infrared imaging lens of the formula of can disappearing of claim 1, characterized by, the said rear fixed group (3) includes the rear lens-barrel (38), there is flange used for connecting the group of zooming in the anterior part of the said rear lens-barrel (38), the said electrical machinery (43) is fixed on rear lens-barrel (38) through the electrical machinery mount (44), the said driving gear (45) is fixed on the output shaft end of the electrical machinery (44), the said clockwork spring spindle (19) and clockwork spring guide assembly (21) are installed on flange.
3. The anti-backlash dual-field thermal infrared imaging lens according to claim 2, wherein the variable power driven wheel (30) is provided with internal teeth, one side of the variable power driven wheel (30) having the internal teeth protrudes out of a flange of the rear barrel (38) and is located behind the flange, and the driving gear (45) is engaged with the internal teeth.
4. The double-field thermal infrared imaging lens capable of eliminating the backlash according to claim 3, wherein the spring rotating shaft (19) is fixedly connected to a flange after passing through a central hole of the constant force spring (20), an avoiding groove is formed in the rear portion of the variable-power driven wheel (30), and an extending end of the constant force spring (20) passes through the avoiding groove after being stretched and is connected to the outer side face of the variable-power driven wheel (30).
5. The double-field infrared thermal imaging lens capable of eliminating backlash according to any one of claims 2 to 4, wherein the spring guide assembly (21) comprises a spring guide rotating shaft (46), a rolling bearing (47) and a guide spacer ring (48), the guide spacer ring (48) is sleeved on the spring guide rotating shaft (46), an inner ring of the rolling bearing (47) is sleeved on the guide rotating shaft (46), an outer ring of the rolling bearing (47) is in contact with an inner side surface of the constant force spring (20), the upper rolling bearing (47) and the lower rolling bearing (47) are spaced by the guide spacer ring (48), and the guide spacer ring (48) connects the inner rings of the two adjacent rolling bearings (47) to enable the inner rings of the rolling bearings (47) and the guide rotating shaft (46) not to rotate relatively.
6. The anti-backlash double-field thermal infrared imaging lens according to any one of claims 1 to 4, wherein the zoom group (2) further includes a sliding sleeve (16), a sliding rod assembly (7), and a zoom lens assembly (18), the sliding sleeve (16) is installed inside the zoom lens barrel (15) and can rotate around a central axis of the zoom lens barrel (15) inside the zoom lens barrel (15), the zoom lens assembly (18) is installed in the sliding sleeve (16), the sliding rod assembly (7) passes through the zoom lens barrel (15) and the sliding sleeve (16) and then is connected with the zoom lens assembly (18), and a sliding sleeve retainer ring (17) for limiting the axial movement of the sliding sleeve is installed at the front end of the zoom lens barrel (15).
7. The anti-backlash double-field thermal infrared imaging lens according to claim 6, wherein a cam curved groove for realizing a lens movement track is provided on a cylindrical surface of the sliding sleeve (16), a front-rear direction linear groove is provided on a cylindrical surface of a front portion of the zoom lens barrel (15), and a circumferential direction linear groove is provided on a cylindrical surface of a rear end; the zoom lens assembly (18) is arranged in an inner cavity of the sliding sleeve (16), the sliding rod assembly (7) passes through a linear groove in the front of the zoom lens barrel and a cam curve groove of the sliding sleeve and then is arranged on a corresponding threaded hole of the zoom lens assembly (18), and the zoom lens assembly (18) can move back and forth in the sliding sleeve (16) to realize the field switching of the lens.
8. The anti-backlash double-field of view infrared thermal imaging lens according to claim 7, wherein the sliding sleeve (16) is provided with a zoom driving rod (27), the zoom driving rod (27) passes through a linear groove at the rear end of the zoom lens barrel (15) and then is mounted on a threaded hole of the sliding sleeve (16), and a clamping groove is formed in the inner wall of the zoom driven wheel (30) and is sleeved on the zoom driving rod (27); and the zooming lens barrel (15) is also provided with a zooming left limiting component (28) and a zooming right limiting component (29).
9. The camera according to claim 1, further comprising a front fixed group (1) and a non-refrigerated infrared thermal imaging lens group (4), wherein the front fixed group (1), the zoom group (2), the rear fixed group (3) and the non-refrigerated infrared thermal imaging lens group (4) are sequentially connected from front to back.
10. An infrared thermal imaging lens using method is characterized by comprising the infrared thermal imaging lens of claim 9, when in use, after an infrared core (9) receives a view field switching instruction, position parameters of a target view field are retrieved, a motor (43) is started and controlled to rotate, a driving gear (45) drives a zoom driven wheel (30) to rotate in a certain circumferential range, a zoom driving rod (27) drives a sliding sleeve (16) to rotate in a zoom lens barrel (15), and the zoom lens assembly (17) is driven to move back and forth in an inner cavity of the sliding sleeve (16) while the sliding sleeve (16) rotates, so that the view field switching is finally completed; when the lens finishes the view field switching, the limiting rod (31) just presses the blocking piece of the microswitch (33) and cuts off the power supply of the motor (43) in time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010839849.3A CN111965780B (en) | 2020-08-19 | 2020-08-19 | Clearance-eliminating type double-field-of-view infrared thermal imaging lens and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010839849.3A CN111965780B (en) | 2020-08-19 | 2020-08-19 | Clearance-eliminating type double-field-of-view infrared thermal imaging lens and using method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111965780A true CN111965780A (en) | 2020-11-20 |
| CN111965780B CN111965780B (en) | 2021-05-11 |
Family
ID=73388704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010839849.3A Active CN111965780B (en) | 2020-08-19 | 2020-08-19 | Clearance-eliminating type double-field-of-view infrared thermal imaging lens and using method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111965780B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112782830A (en) * | 2021-01-20 | 2021-05-11 | 中国科学院长春光学精密机械与物理研究所 | Visual field switching device |
| CN116338957A (en) * | 2022-12-19 | 2023-06-27 | 江苏泽景汽车电子股份有限公司 | HUD lens driving system |
| CN116338957B (en) * | 2022-12-19 | 2024-05-14 | 江苏泽景汽车电子股份有限公司 | HUD lens driving system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201732199U (en) * | 2010-02-09 | 2011-02-02 | 彩亿科技(深圳)有限公司 | Focusing device of miniature projector |
| JP2011060375A (en) * | 2009-09-10 | 2011-03-24 | Funai Electric Co Ltd | Disk device |
| CN206573855U (en) * | 2016-11-25 | 2017-10-20 | 深圳市东方宇之光科技股份有限公司 | A kind of resolution ratio switching device of roller imaging |
| CN108681024A (en) * | 2018-06-08 | 2018-10-19 | 中国科学院西安光学精密机械研究所 | A kind of moving-target face focus adjusting mechanism and its target surface tilt quantity and optical axis glitch detection method |
| US20190379305A1 (en) * | 2018-06-08 | 2019-12-12 | Canon Kabushiki Kaisha | Vibration wave motor, drive control system, and optical apparatus |
-
2020
- 2020-08-19 CN CN202010839849.3A patent/CN111965780B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011060375A (en) * | 2009-09-10 | 2011-03-24 | Funai Electric Co Ltd | Disk device |
| CN201732199U (en) * | 2010-02-09 | 2011-02-02 | 彩亿科技(深圳)有限公司 | Focusing device of miniature projector |
| CN206573855U (en) * | 2016-11-25 | 2017-10-20 | 深圳市东方宇之光科技股份有限公司 | A kind of resolution ratio switching device of roller imaging |
| CN108681024A (en) * | 2018-06-08 | 2018-10-19 | 中国科学院西安光学精密机械研究所 | A kind of moving-target face focus adjusting mechanism and its target surface tilt quantity and optical axis glitch detection method |
| US20190379305A1 (en) * | 2018-06-08 | 2019-12-12 | Canon Kabushiki Kaisha | Vibration wave motor, drive control system, and optical apparatus |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112782830A (en) * | 2021-01-20 | 2021-05-11 | 中国科学院长春光学精密机械与物理研究所 | Visual field switching device |
| CN116338957A (en) * | 2022-12-19 | 2023-06-27 | 江苏泽景汽车电子股份有限公司 | HUD lens driving system |
| CN116338957B (en) * | 2022-12-19 | 2024-05-14 | 江苏泽景汽车电子股份有限公司 | HUD lens driving system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111965780B (en) | 2021-05-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7010224B2 (en) | Lens barrel incorporating the rotation transfer mechanism | |
| US7106961B2 (en) | Lens barrel incorporating the advancing/retracting mechanism | |
| US7085486B2 (en) | Lens barrel incorporating a rotatable ring | |
| US7031604B2 (en) | Lens barrel incorporating the linear guide mechanism | |
| US7079762B2 (en) | Supporting structure for supporting a rotatable ring | |
| US6963694B2 (en) | Lens barrel | |
| US6990291B2 (en) | Lens barrel having a moving optical element support frame | |
| US7062163B2 (en) | Cam mechanism of a photographing lens | |
| US7031603B2 (en) | Lens barrel | |
| US7035535B2 (en) | Optical element retracting mechanism for a retractable photographing lens | |
| US7085487B2 (en) | Cam mechanism of a photographing lens | |
| US7027727B2 (en) | Lens barrel incorporating the cam mechanism | |
| US7131772B2 (en) | Retracting mechanism of a retractable lens | |
| US6952526B2 (en) | Retractable lens barrel | |
| US7039308B2 (en) | Cam mechanism of a photographing lens | |
| US7097367B2 (en) | Optical element retracting mechanism for a photographing lens | |
| US6959148B2 (en) | Retractable photographing lens | |
| US20040042092A1 (en) | Rotation transfer mechanism and a zoom camera incorporating the rotation transfer mechanism | |
| US20040042090A1 (en) | Retractable lens barrel | |
| US20040151490A1 (en) | Optical element retracting mechanism for a retractable lens | |
| CN111965780B (en) | Clearance-eliminating type double-field-of-view infrared thermal imaging lens and using method thereof | |
| CN212846096U (en) | Gap-eliminating type double-field-of-view infrared thermal imaging lens | |
| JPH0452629A (en) | Mechanism and method for positioning lens barrel | |
| JP3128129B2 (en) | Lens barrel positioning mechanism and positioning method | |
| KR19990040876A (en) | Barrel assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |