CN216956506U - Structure of long-focus zoom lens - Google Patents
Structure of long-focus zoom lens Download PDFInfo
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- CN216956506U CN216956506U CN202122952493.7U CN202122952493U CN216956506U CN 216956506 U CN216956506 U CN 216956506U CN 202122952493 U CN202122952493 U CN 202122952493U CN 216956506 U CN216956506 U CN 216956506U
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Abstract
The utility model relates to a long-focus zoom lens structure, which is characterized in that a focusing assembly, a continuous zooming assembly, a rear fixing assembly and an optical filter switching assembly are sequentially arranged from incident light to emergent light; the focusing assembly comprises a focusing main lens barrel, a focusing lens group and a focusing cam, wherein the focusing lens group is sleeved in the focusing main lens barrel and can be adjusted and moved along the axis direction of an optical axis; the continuous zooming assembly comprises a main lens cone, a zooming sliding frame and a compensating sliding frame, wherein the zooming sliding frame and the compensating sliding frame are respectively sleeved in the front part and the rear part of the main lens cone and can be adjusted and moved along the axis direction of an optical axis, a zooming lens group and a compensating lens group are respectively and fixedly arranged in the zooming sliding frame and the compensating sliding frame, and the optical filter switching assembly comprises a rear group connecting plate with an optical filter hole and an optical filter rotating disc which is rotatably connected to the back surface of the rear group connecting plate.
Description
The technical field is as follows:
the utility model relates to a long-focus zoom lens structure, and belongs to the technical field of photoelectricity.
Background art:
for the long-focus zoom lens, because the focal length is too long, the occupied space of the whole lens assembly is larger, and meanwhile, the increase of the volume often drives the increase of the whole weight, so that the use requirements of some specific environments cannot be met; and under the condition that the weight and the volume are satisfied, the focusing range limits the size of the lens.
The utility model content is as follows:
the utility model aims to overcome the defects and provide a long-focus zoom lens structure, which reduces the whole volume and the weight of the whole structure when the long-focus zoom switching is required to be used, achieves the results of short total length and compact structure of a system through the precise matching of structural parts, and completes a light long-focus zoom lens.
The utility model relates to a long-focus zoom lens structure, which is characterized in that: a focusing assembly, a continuous zooming assembly, a rear fixing assembly and an optical filter switching assembly are sequentially arranged from incident light to emergent light; the focusing assembly comprises a focusing main lens barrel, a focusing lens group and a focusing cam, wherein the focusing lens group is sleeved in the focusing main lens barrel and can be adjusted and moved along the axis direction of an optical axis; the continuous zooming assembly comprises a main lens cone, a zooming sliding frame and a compensating sliding frame, wherein the zooming sliding frame and the compensating sliding frame are respectively sleeved in the front portion and the rear portion of the main lens cone and can be adjusted and moved along the axis direction of an optical axis, a zooming lens group and a compensating lens group are respectively and fixedly arranged in the zooming sliding frame and the compensating sliding frame, a rear fixing lens group is arranged in the rear fixing assembly, the optical filter switching assembly comprises a rear group connecting plate with a filtering hole and an optical filter rotating disc which is rotatably connected to the back of the rear group connecting plate, the optical filter rotating disc is driven by an optical filter motor to rotate and switch between two stations, a visible optical filter and a near infrared optical filter which correspond to the filtering hole are arranged on the optical filter rotating disc, and the visible optical filter or the near infrared optical filter is coaxial with the filtering hole after the position rotation and switching between the two stations.
Furthermore, a linear chute is arranged on the focusing cam, a straight slot is arranged on the focusing main lens barrel, the focusing guide nail assembly is fixed on the focusing lens group and penetrates through the linear chute and the straight slot, the focusing lens group is connected with the focusing cam and the focusing main lens barrel together, a focusing motor gear arranged on the focusing main lens barrel is meshed with a gear on the focusing cam, the focusing cam is driven to rotate when the focusing motor is powered on to rotate, and then the focusing lens group is driven to move axially along the optical axis.
Furthermore, the zoom lens group is arranged on the zoom carriage through screws to form a zoom assembly; the compensation lens group is arranged on the compensation sliding frame through a screw to form a compensation assembly; the zooming slide frame and the compensating slide frame are respectively arranged at the front part and the rear part in the main lens cone body, the zooming cam is provided with a zooming curve groove and a compensating curve groove, the zooming guide pin component and the compensating guide pin component are respectively fixed on the zooming slide frame and the compensating slide frame, the zooming guide pin component and the compensating guide pin component respectively penetrate through a straight groove and the zooming curve groove or the compensating curve groove on the main lens cone body, and the zooming cam is connected with the zooming slide frame and the compensating slide frame; the zoom motor gear driven by the zoom motor is meshed with the gear of the zoom cam to rotate, so that the zoom assembly and the compensation assembly linearly move back and forth along the optical axis, and the focal length of the system is continuously variable.
Furthermore, the optical filter motor of the optical filter switching assembly is connected with an optical filter motor gear, the optical filter motor gear is meshed with the optical filter idler wheel and a gear on the optical filter turntable, the optical filter motor gear, the optical filter idler wheel and the gear on the optical filter turntable are driven to rotate after the optical filter motor is powered on, and an optical filter Hall element which plays a limiting role is arranged on the rear group connecting plate and located beside the optical filter turntable so as to realize the back-and-forth switching between the visible light optical filter and the infrared optical filter.
The utility model has the advantages that: on the premise of meeting the use requirement of a long focal length, the overall structure size is reduced, so that the lens is more convenient to carry and wider in use range.
Description of the drawings:
FIG. 1 is a schematic cross-sectional view of a lens according to an embodiment of the utility model;
FIG. 2 is a schematic front view of a cross section of a lens focusing mechanism according to an embodiment of the present invention;
FIG. 3 is a side view schematic of the configuration of FIG. 2;
FIG. 4 is a schematic front sectional view of a zoom lens mechanism according to an embodiment of the present invention;
FIG. 5 is a side view schematic of the construction of FIG. 4;
FIG. 6 is a schematic diagram of a front view of a lens filter mechanism according to an embodiment of the present invention;
FIG. 7 is a side view schematic of the construction of FIG. 6;
in the figure: 11-a focusing cam pressing ring, 12-a focusing main barrel, 13-a focusing lens group, 14-a focusing guide pin assembly, 15-a focusing cam, 16-a focusing magnetic steel, 17-a focusing Hall element, 18-a focusing motor gear, 19-a focusing potentiometer gear, 110-a focusing motor, 111-a focusing potentiometer, 21-a zoom lens group, 22-a zoom carriage, 23-a front row of steel balls, 24-a zoom guide pin assembly, 25-a zoom cam, 26-a main barrel, 27-a rear row of steel balls, 28-a zoom cam pressing ring, 29-a compensation lens group, 210 a compensation carriage, 211-a compensation guide pin assembly, 212-a focusing Hall element, 213-a zoom magnet, 214-a zoom potentiometer, 215-a zoom motor, 216-a zoom potentiometer gear, 217-zoom motor gear, 31-rear group connecting plate, 32-visible light filter, 33-filter turntable shaft, 34-filter Hall element, 35-near infrared filter, 36-filter turntable, 37-filter motor gear, 38-filter wheel, 39-filter motor, 310-filter hole.
The specific implementation mode is as follows:
the long-focus zoom lens structure is characterized in that a focusing assembly 1, a continuous zooming assembly 2, a rear fixing assembly 4, an optical filter switching assembly 3 and a detector assembly 5 are sequentially arranged from incident light to emergent light; the focusing assembly 1 comprises a focusing main lens barrel 12, a focusing lens group 13 which is sleeved in the focusing main lens barrel 12 and can be adjusted and moved along the axis direction of an optical axis, and a focusing cam 15 which is sleeved on the focusing main lens barrel 12; the continuous zooming assembly 2 comprises a main lens barrel 26, a zooming carriage 22 and a compensating carriage 210 which are respectively sleeved in the front part and the rear part of the main lens barrel 26 and can be adjusted and moved along the axis direction of an optical axis, a zooming lens group 21 and a compensating lens group 29 are respectively and fixedly arranged in the zooming carriage 22 and the compensating carriage 210, a rear fixing lens group 41 is arranged in the rear fixing assembly body 4, the optical filter switching assembly 3 comprises a rear group connecting plate 31 with a filtering hole and an optical filter turntable 36 which is rotatably connected to the back surface of the rear group connecting plate 31, the optical filter turntable 36 is driven by an optical filter motor 39 to rotate and switch between two stations, a visible optical filter 32 and a near infrared optical filter 35 which correspond to the filtering hole 310 are arranged on the optical filter turntable 36, and the visible optical filter or the near infrared optical filter is coaxial with the filtering hole after the position rotation and the switching between the two stations.
The focusing cam 15 is provided with a linear inclined groove, the focusing main lens barrel 12 is provided with a straight groove, the focusing guide pin assembly 14 is fixed on the focusing lens group 13 and penetrates through the linear inclined groove and the straight groove, the focusing lens group 13 is connected with the focusing cam 15 and the focusing main lens barrel 12, a focusing motor gear 18 arranged on the focusing main lens barrel 12 is meshed with a gear on the focusing cam 15, the focusing cam 15 is driven to rotate when the focusing motor 110 is powered on to rotate, and then the focusing lens group 13 is driven to move axially along an optical axis.
The zooming lens group 21 is arranged on the zooming carriage 22 through screws to form a zooming assembly; the compensating mirror group 29 is mounted on the compensating carriage 210 through screws to form a compensating assembly; the zooming carriage 22 and the compensating carriage 210 are respectively arranged at the front part and the rear part in the main lens barrel 26, the zooming cam 25 is provided with a zooming curve slot and a compensating curve slot, the zooming guide pin assembly 24 and the compensating guide pin assembly 211 are respectively fixed on the zooming carriage 22 and the compensating carriage 210, the zooming guide pin assembly 24 and the compensating guide pin assembly 211 respectively pass through a straight slot and the zooming curve slot or the compensating curve slot on the main lens barrel 26, and the zooming cam 25 is connected with the zooming carriage 22 and the compensating carriage 210; the zooming motor gear driven by the zooming motor 215 is meshed with the gear of the zooming cam 25 to rotate, so that the zooming component and the compensation component linearly move back and forth along the optical axis, and the continuous variable of the system focal length is realized.
The optical filter motor 39 of the optical filter switching assembly 3 is connected with the optical filter motor gear 37, the optical filter motor gear 37 is meshed with the optical filter idle wheel 38 and the gear on the optical filter turntable 36, after the optical filter motor 39 is powered on, the optical filter motor gear 37, the optical filter idle wheel 38 and the gear on the optical filter turntable 36 are driven to rotate, and the optical filter hall element 34 which plays a role in limiting is arranged on the rear group connecting plate 31 and beside the optical filter turntable 36, so that the back-and-forth switching between the visible light optical filter and the infrared optical filter is realized.
The specific construction and the working description are as follows, referring to the figure, the focusing mechanism of the utility model selects the front fixed group lens of the optical system to form a focusing group; the focusing lens group 13 and the focusing cam 15 are respectively arranged in the focusing main lens barrel 12 after being in grinding fit with the focusing main lens barrel 12, the focusing cam 15 mills a linear inclined groove according to the requirement of an optical system on the focusing amount, and the focusing main lens barrel 12 mills a straight groove; the focusing mirror group 13 is connected with a focusing cam 15 and a focusing main lens barrel 12 by a focusing guide pin assembly 14, and a focusing motor gear 18 is meshed with a gear on the focusing cam 15; when the focusing motor 110 is powered on to rotate to drive the focusing cam 15 to rotate, the rotation motion of the focusing mirror group 13 is converted into linear motion through the restriction of a straight slot on the focusing main lens barrel 12, so that the focusing of a far target and a near target is realized, and the focusing process is completed; when focusing a far and near target, the focusing potentiometer gear 19 drives the focusing potentiometer 111 to rotate through meshing with a gear on the focusing cam 15, so that the resistance value of the zooming potentiometer changes, the change value of the zooming potentiometer can be read through a proper sampling circuit and is transmitted to a control center, and the display of a focusing distance value is realized; on the contrary, the real-time control of the focusing distance value can be realized by giving a command through the control center.
Referring to the drawings, in the continuous zooming assembly 2, a zoom lens group 21 is mounted on a zoom carriage 22 through screws to form a zoom assembly; the compensating mirror group 29 is mounted on the compensating carriage 210 through screws to form a compensating assembly; the zooming carriage 22 and the compensating carriage 210 are respectively arranged in the main lens cone 26 after being matched with the main lens cone 26 in a grinding way, the zooming cam 25 is arranged on the main lens cone 26 through front and rear precise steel balls 23 and 27 and is pressed tightly by a zooming cam pressing ring 28 to form a rolling bearing structure, and the sliding friction of the zooming cam 25 during rotation is converted into rolling friction so as to reduce the friction force of the zooming cam 25 during movement; the zoom cam 25 mills a zooming curve groove and a compensating curve groove respectively according to the requirement of an optical zooming motion equation, and then the zoom cam 25 is connected with the zooming carriage 22 and the compensating carriage 210 by using a zooming guide pin assembly 24 and a compensating guide pin assembly 211; the zoom motor gear 217 and the zoom potentiometer gear 216 are respectively meshed with the gear of the zoom cam 25; when the zoom motor 215 makes positive and negative rotation movement, the zoom potentiometer 214 and the zoom cam 25 are rotated synchronously; the zooming and compensating curve slot, the zooming guide pin component 24 and the compensating guide pin component 211 drive the zooming carriage 22 and the compensating carriage 210 to move according to the zooming and compensating curve slot; the two straight grooves on the main lens barrel 26 play a role in supporting the zoom guide pin assembly 24 and the compensation guide pin assembly 211, so that the rotary motion of the zoom carriage 22 and the compensation carriage 210 is changed into linear motion; the fit clearance between the variable-magnification guide pin assembly 24 and the compensation guide pin assembly 211 and the curve groove of the zoom cam 25 and the straight line groove of the main lens barrel 26 is strictly controlled, so that the sliding stability and comfort of the variable-magnification and compensation assemblies are ensured, and no clamping stagnation is caused; thus, the zooming motor 215 rotates to realize the forward and backward linear motion of the zooming component and the compensating component according to the requirement of the zooming motion equation, thereby realizing the continuous variable function of the system focal length.
When the focal length of the system changes, the zoom potentiometer gear is meshed with the zoom cam gear to enable the zoom potentiometer 214 to rotate, the resistance value of the zoom potentiometer 214 changes, the change value of the zoom potentiometer 214 can be taken out through a proper sampling circuit and is transmitted to the control center, and therefore the display of the focal length value is achieved; on the contrary, the real-time control of the focal length can be realized by giving a command through the control center.
Referring to the drawings, the visible light filter 32 and the infrared filter 35 of the filter switching assembly 3 are respectively installed in the filter turntable 36 according to the positions shown in the drawings, and the filter turntable 36 is fixed on the rear group connecting plate 31 through the filter turntable shaft 33, so that the filter turntable 36 is ensured to rotate stably without clamping stagnation; the filter motor gear 37 connected with the filter motor 39 is meshed with the filter turntable gear 36 through the filter transmission wheel 38, when the filter motor 39 is powered on, the filter turntable 36 is driven to rotate, and the filter Hall element 34 plays a limiting role, so that the visible light filter and the infrared filter can be switched back and forth, and the fog penetration requirement is finally met.
The optical filter comprises a continuous zooming assembly, a focusing assembly, a rear fixing assembly, an optical filter switching assembly, a detector assembly, a connecting base and the like; the device has the functions of electric continuous zooming, electric focusing, optical filter switching working mode, image output and the like; the control panel passes through the control grillage to be fixed at the camera lens top, reduces occupation space. The lens requires long-focus zooming switching for use, reduces the whole volume, lightens the weight of the whole structure, achieves the achievement of total length and compact structure of the system through precise matching between structural parts, and completes the light long-focus zooming lens.
This application focusing subassembly is through grinding the cooperation between main lens and focusing cam and the focusing mirror group to reach the assembly precision between the part, the focusing cam leads the nail through the focusing of three equipartition and couples with the focusing lens cone. The guide nail makes the focusing lens cone do linear reciprocating motion under the action of three uniformly distributed straight slots arranged on the front group lens cone, so that the circular motion of the motor drives the focusing seat to do linear motion, and the forward and reverse rotation of the motor can drive the focusing group to move back and forth, thereby realizing the focusing purpose.
This application becomes multiple subassembly and compensation assembly and is connected through leading nail and zoom cam, adjusts the position of becoming multiple subassembly and compensation assembly simultaneously through the curve groove, become multiple cam through become multiple roller on leading the nail with become multiple balladeur train hookup, lead the nail and make become multiple subassembly and compensation assembly make straight line reciprocating motion under the straight flute effect on the main lens cone, the circular motion of motor drives the balladeur train like this and is linear motion, the motor just reverses can drive the seesaw of becoming multiple mechanism, thereby realize becoming multiple purpose.
The focusing motor, the zooming motor and the optical filter motor are all mounted in a backpack mode, so that the whole lens is simple and attractive; the motor gear is equipped with the mechanism of skidding, and the gear compresses tightly the pressure spring through lock nut and the gasket that skids is fixed, and the gear skids when the motor transships, protects the motor.
When the focusing motor runs, the motor gear and the idler wheel are driven to rotate, so that the focusing cam rotates, the focusing cam is connected with the focusing lens cone through three uniformly distributed focusing guide nails, the guide nails enable the focusing lens cone to do linear reciprocating motion under the action of three uniformly distributed straight slots formed in the rear group lens cone, the circular motion of the motor drives the focusing seat to do linear motion, and the motor rotates forwards and backwards to drive the focusing group to do front-and-back motion, so that the focusing purpose is realized.
When the zooming motor runs, the zooming cam rotates by driving the motor gear and the idle wheel to rotate, the zooming cam is connected with the zooming carriage through the zooming roller on the zooming guide nail, the guide nail makes the zooming assembly and the compensation assembly do linear reciprocating motion under the action of the straight slot on the main lens cone, so that the circular motion of the motor drives the carriage to do linear motion, and the forward and reverse rotation of the motor can drive the zooming mechanism to move back and forth, thereby realizing the zooming purpose.
The focusing mechanism, the zooming mechanism and the optical filter switching mechanism are connected in a matching mode through threads and the front of the optical filter switching mechanism, the concentricity requirement can be effectively guaranteed, the appearance size is reduced, and the lens is light and small as possible. Meanwhile, the convenience of processing, assembly and debugging is considered.
All the thread joints of the lens are glued and fastened, and all the cone-end set screws are wrapped with pits and glued and fastened, so that firm connection is ensured, and the performances of vibration resistance, impact resistance and the like are improved.
The inner walls of the lens front group lens barrel, the pressing rings, the spacing rings and the like are all provided with insections with proper width, and coated with matting paint, and the inner walls of the lens barrel are utilized to scatter and absorb stray light radiation, so that the aim of inhibiting the stray light is fulfilled.
The rear focusing group is used for focusing different targets at different distances, so that the defect of small depth of field of the large-caliber lens is overcome; meanwhile, the focusing group is used for carrying out temperature focusing on the image plane drift caused by temperature, so that the lens can still well image in a high-temperature and low-temperature state.
The screw thread connection of the front lens cone, the zooming compensation mechanism and the optical filter mechanism is coated with glue and is fastened by a cone end fastening screw holding pit.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (4)
1. A long-focus zoom lens structure is characterized in that: a focusing assembly, a continuous zooming assembly, a rear fixing assembly and an optical filter switching assembly are sequentially arranged from incident light to emergent light; the focusing assembly comprises a focusing main lens barrel, a focusing lens group and a focusing cam, wherein the focusing lens group is sleeved in the focusing main lens barrel and can be adjusted and moved along the axis direction of an optical axis; the continuous zooming assembly comprises a main lens cone, a zooming sliding frame and a compensating sliding frame, wherein the zooming sliding frame and the compensating sliding frame are respectively sleeved in the front portion and the rear portion of the main lens cone and can be adjusted and moved along the axis direction of an optical axis, a zooming lens group and a compensating lens group are respectively and fixedly arranged in the zooming sliding frame and the compensating sliding frame, a rear fixing lens group is arranged in the rear fixing assembly, the optical filter switching assembly comprises a rear group connecting plate with a filtering hole and an optical filter rotating disc which is rotatably connected to the back of the rear group connecting plate, the optical filter rotating disc is driven by an optical filter motor to rotate and switch between two stations, a visible optical filter and a near infrared optical filter which correspond to the filtering hole are arranged on the optical filter rotating disc, and the visible optical filter or the near infrared optical filter is coaxial with the filtering hole after the position rotation and switching between the two stations.
2. The long focal length zoom lens structure of claim 1, wherein: the focusing cam is provided with a linear chute, the focusing main lens barrel is provided with a straight slot, the focusing guide pin assembly is fixed on the focusing lens group and penetrates through the linear chute and the straight slot, the focusing lens group is connected with the focusing cam and the focusing main lens barrel together, a focusing motor gear arranged on the focusing main lens barrel is meshed with a gear on the focusing cam, the focusing cam is driven to rotate when the focusing motor is powered on to rotate, and then the focusing lens group is driven to move axially along an optical axis.
3. The long focal length zoom lens structure of claim 1, wherein: the zooming lens group is arranged on the zooming carriage through screws to form a zooming assembly; the compensation lens group is arranged on the compensation sliding frame through a screw to form a compensation assembly; the zooming slide frame and the compensating slide frame are respectively arranged at the front part and the rear part in the main lens cone body, the zooming cam is provided with a zooming curve groove and a compensating curve groove, the zooming guide pin component and the compensating guide pin component are respectively fixed on the zooming slide frame and the compensating slide frame, the zooming guide pin component and the compensating guide pin component respectively penetrate through a straight groove and the zooming curve groove or the compensating curve groove on the main lens cone body, and the zooming cam is connected with the zooming slide frame and the compensating slide frame; the zoom motor gear driven by the zoom motor is meshed with the gear of the zoom cam to rotate, so that the focal length of the system can be continuously changed.
4. The long focal length zoom lens structure of claim 1, wherein: the optical filter motor of the optical filter switching assembly is connected with an optical filter motor gear, the optical filter motor gear is meshed with the optical filter idler wheel and a gear on the optical filter turntable, the optical filter motor gear, the optical filter idler wheel and the gear on the optical filter turntable are driven to rotate after the optical filter motor is powered on, and an optical filter Hall element which plays a limiting role is arranged on the rear group connecting plate and located beside the optical filter turntable so as to realize the back-and-forth switching between the visible optical filter and the infrared optical filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122952493.7U CN216956506U (en) | 2021-11-29 | 2021-11-29 | Structure of long-focus zoom lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122952493.7U CN216956506U (en) | 2021-11-29 | 2021-11-29 | Structure of long-focus zoom lens |
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| CN216956506U true CN216956506U (en) | 2022-07-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116047733A (en) * | 2022-12-20 | 2023-05-02 | 福建福光股份有限公司 | Zoom lens structure and working method |
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2021
- 2021-11-29 CN CN202122952493.7U patent/CN216956506U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116047733A (en) * | 2022-12-20 | 2023-05-02 | 福建福光股份有限公司 | Zoom lens structure and working method |
| CN116047733B (en) * | 2022-12-20 | 2024-03-15 | 福建福光股份有限公司 | Zoom lens structure and working method |
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