CN210155381U - Zooming core of automatic zooming lens based on incremental magnetic encoder - Google Patents
Zooming core of automatic zooming lens based on incremental magnetic encoder Download PDFInfo
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- CN210155381U CN210155381U CN201921053985.9U CN201921053985U CN210155381U CN 210155381 U CN210155381 U CN 210155381U CN 201921053985 U CN201921053985 U CN 201921053985U CN 210155381 U CN210155381 U CN 210155381U
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Abstract
The utility model discloses a zooming core of an automatic zooming lens based on an incremental magnetic encoder, which comprises a front fixing component and a rear fixing component which are arranged at the front end and the rear end of a zooming lens cone, wherein the front fixing component and the rear fixing component are matched in the zooming lens cone, the zooming component and the compensation component are matched in the zooming lens cone, an axial guide straight groove is arranged on the zooming lens cone, a zooming curve cylinder is sleeved on the zooming lens cone and passes through the front fixing component, the back rolling bearing is in place, the zooming curve cylinder is provided with a front spiral driving groove and a back spiral driving groove corresponding to the zooming component and the compensating component, a front pin and a back pin are arranged in the guide straight groove in a sliding manner, the front pin is connected with the zooming component and the front spiral driving groove, the back pin is connected with the compensating component and the back spiral driving groove, a zooming curve cylinder corner feedback unit is arranged between the zooming curve cylinder and the zooming lens barrel and comprises a magnetized multi-pole magnetic ring and a correspondingly arranged incremental magnetic encoder with an auxiliary circuit. The utility model discloses a zoom process is smooth and easy, reliable, simple, the precision is high, good reproducibility.
Description
Technical Field
The utility model relates to an optical instrument specifically is a nuclear of becoming doubly of automatic zoom camera lens based on incremental magnetic encoder.
Background
The zoom lens generally comprises a front fixed component, a zoom component, a compensation component and a rear fixed component. When the lens is zoomed, the zooming component and the compensation component move along the optical axis according to a specific track, thereby keeping the position of the image surface of the lens stable.
The structure of a typical zoom lens is as follows: the front fixing component and the rear fixing component are fixedly arranged at two ends of the zoom lens barrel, the zoom component and the compensation component are matched with the zoom lens barrel by adopting small clearance, a guide straight groove is processed on the zoom lens barrel, and the two components can slide in the zoom lens barrel along the direction of the guide straight groove; the zoom lens barrel is sleeved with a zoom curve barrel, and the zoom curve barrel and the zoom lens barrel are in small clearance fit; a spiral groove for driving the variable-power component and the compensation component to move is processed on the variable-power curve cylinder; the zooming component and the compensation component penetrate through the straight guide groove of the zooming lens barrel through the connecting pin to be connected with the zooming curve barrel. When the zooming curve cylinder rotates, the zooming component and the compensating component move along the straight guide groove direction according to the track of the zooming curve spiral groove.
Typical auto zoom lenses are: the zooming curve cylinder is provided with a gear, a motor with a coder is arranged and fixed on the shell of the lens, the gear arranged on the output shaft of the motor is meshed with the gear on the zooming curve cylinder, the motor drives the zooming curve cylinder to rotate, and the rotation angle of the zooming curve cylinder and the multiplying power of the lens have the unique corresponding relation. The external drive control circuit is connected with the motor through a cable, and the control panel can send a drive pulse signal to the motor and receive an angle feedback signal from the encoder; the external drive control circuit is connected with a PC (personal computer) through a signal cable for data communication, and an external power supply directly supplies power to the drive control circuit. The working process is as follows: the PC sends a zooming instruction to the drive control circuit, the drive control circuit drives the motor to move and receives feedback data from the encoder in real time, and the drive control circuit uploads related data to the PC after zooming is completed.
Therefore, the zooming lens barrel and the zooming curve barrel are in small clearance fit, and the two ends of the zooming curve barrel are limited and cannot move up and down, so that friction of parts matched with the zooming curve barrel exists on the front end face, the rear end face and the inner hole of the zooming curve barrel, and the zooming process is not smooth directly due to the friction. The precision of the rotation angle control of the zoom curve cylinder has extremely important significance on the zoom precision of the lens. However, due to the existence of gear transmission errors, the feedback value of the encoder on the motor cannot truly reflect the rotation angle of the zooming curve cylinder; this error will be greater when reversing the motion.
SUMMERY OF THE UTILITY MODEL
For solving the not enough of prior art, the utility model provides an automatic zoom camera lens's zoom nuclear based on incremental magnetic encoder.
The zooming core of the automatic zooming lens based on the incremental magnetic encoder can solve the technical problems, and comprises a front fixed component and a rear fixed component which are coaxially arranged at the front end and the rear end of a zooming lens barrel, the front zooming component and the rear zooming component and the compensating component are in clearance fit in the barrel body of the zooming lens barrel, an axial guide straight groove is arranged on the barrel body of the zooming lens barrel, a zooming curve barrel is sleeved in the zooming lens barrel, a front spiral driving groove and a rear spiral driving groove which correspond to the zooming component and the compensating component are arranged on the barrel body of the zooming curve barrel, a front pin and a rear pin are arranged in the guide straight groove in a sliding way, two ends of the front pin are respectively connected with the zooming component and the front spiral driving groove, two ends of the rear pin are respectively connected with the compensating component and the rear spiral driving groove, the difference is that the zooming curve barrel is matched with the zooming lens barrel through a front rolling bearing and a rear rolling bearing, a corner feedback unit of the zooming curve barrel is arranged between the zooming curve barrel and the zooming lens barrel, the variable-magnification curve cylinder corner feedback unit comprises a magnetized multi-pole magnetic ring and an incremental magnetic encoder with an auxiliary circuit, wherein the incremental magnetic encoder is correspondingly arranged in an induction interval, and when the multi-pole magnetic ring rotates relative to the incremental magnetic encoder, the center of a magnetic pole of the multi-pole magnetic ring is superposed with the center of a magnetic sensitive detector of the incremental magnetic encoder.
Conventionally, the multi-pole magnetic ring is coaxially and fixedly arranged on the zoom curve cylinder, and the incremental magnetic encoder is fixedly arranged on the zoom lens cylinder.
Further, when the direction of magnetization of the multi-pole magnetic ring is axial, the detection surface of the incremental magnetic encoder is arranged perpendicular to the axial direction; when the direction of magnetization of the multi-pole magnetic ring is radial, the detection surface of the incremental magnetic encoder is arranged in parallel to the axial direction.
Conventionally, the variable-magnification curve cylinder corner feedback unit is arranged at the front end or the rear end of the variable-magnification curve cylinder.
The utility model has the advantages that:
1. the utility model discloses the zoom nuclear of automatic zoom camera lens based on incremental magnetic encoder, the antifriction bearing cooperation with a zoom curve section of thick bamboo through preceding, back both ends is installed on the zoom lens cone in its structure for the zoom process is more smooth and easy.
2. The utility model discloses in the structure, accurate information such as its rotation direction, rotational speed, rotation angle of quadrature coded pulse of output when becoming doubly a curve section of thick bamboo rotates can direct representation, has eliminated the influence of gear drive error to the precision of becoming doubly.
3. The utility model has the characteristics of simple structure, operation are reliable, the zoom precision is high and the repeatability is good.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another embodiment of the present invention.
And (3) identifying the figure number: 1. pressing a ring; 2. a front rolling bearing; 3. a zoom lens barrel; 4. a variable-magnification curve cylinder; 5. a variable-magnification component; 6. a compensation component; 7. a rear rolling bearing; 8. an incremental magnetic encoder; 9. a multi-pole magnetic ring; 10. rear fixed component; 11. a rear pin; 12. a front pin; 13. a front fixed component; 14. and (4) guiding the straight groove.
Detailed Description
The technical solution of the present invention will be further explained with reference to the embodiments shown in the drawings.
The utility model discloses the zoom nuclear of automatic zoom lens based on incremental magnetic encoder, its technical scheme one includes preceding fixed component 13, back fixed component 10, zoom component 5 and compensation component 6 and a zoom curve section of thick bamboo 4. The front fixing component 13 and the rear fixing component 10 are coaxially arranged at the front end and the rear end of the zoom lens barrel 3, the rear end of the zoom lens barrel 3 is provided with a flange, the zoom component 5 and the compensation component 6 are matched (with a small gap) in the barrel body of the zoom lens barrel 3 according to the front position and the rear position, the barrel body of the zoom lens barrel 3 is provided with an axial guide straight groove 14, and a front pin 12 and a rear pin 11 along the radial direction of the zoom lens barrel 3 are arranged in the guide straight groove 14 in a sliding manner; the zooming curve cylinder 4 is sleeved (with a small gap) on the zooming lens barrel 3 and is installed in place with the zooming lens barrel 3 through the front rolling bearing 2 and the rear rolling bearing 7, the rear rolling bearing 7 is axially limited between the bottom of a flange plate of the zooming lens barrel 3 and the rear end of the zooming curve cylinder 4, and the front end of the zooming lens barrel 3 is screwed with the pressing ring 1 to axially limit the front rolling bearing 2 at the front end of the zooming curve cylinder 4; the front and rear barrel bodies of the zooming curve barrel 4 are respectively provided with a front screw driving groove and a rear screw driving groove, the inner end of the front pin 12 is fixedly connected with the zooming component 5, the outer end of the front pin 12 is slidably arranged in the front screw driving groove, the inner end of the rear pin 11 is fixedly connected with the compensation component 6, and the outer end of the rear pin 11 is slidably arranged in the rear screw driving groove, as shown in fig. 1.
In the structure, when the zooming curve cylinder 4 rotates, the front pin 12 and the rear pin 11 respectively drive the zooming component 5 and the compensating component 6 to move along the track of the front and rear spiral driving grooves along the direction (i.e. axial direction) of the straight guiding groove 14.
A variable-power curve cylinder corner feedback unit is arranged between the rear end of the variable-power curve cylinder 4 and a flange plate at the rear end of the variable-power lens barrel 3, the variable-power curve cylinder corner feedback unit comprises a multi-pole magnetic ring 9 magnetized in the axial direction and an incremental magnetic encoder 8 with an attached circuit, the multi-pole magnetic ring 9 is coaxially and fixedly arranged at the rear end of the variable-power curve cylinder 4, the incremental magnetic encoder 8 is horizontally and fixedly arranged at the bottom of the flange plate, the detection surface of the incremental magnetic encoder 8 is perpendicular to the axial direction and is opposite to the multi-pole magnetic ring 9 and is kept in a reasonable induction interval, when the multi-pole magnetic ring 9 rotates along with the variable-power curve cylinder 4, the magnetic pole center of the incremental magnetic encoder can be superposed with the center of a magnetic sensitive detector of the incremental magnetic encoder 8, and the regular output of the incremental magnetic encoder 8 can represent orthogonal encoding pulses of the rotating speed, the direction and the rotating angle of the variable-power curve cylinder 4 (namely the feedback quantity, through the orthogonal coding pulse, the control system can drive the control motor to accurately reach the target multiplying power, as shown in fig. 1.
The utility model discloses the zoom nuclear of automatic zoom camera lens based on incremental magnetic encoder, its technical scheme two is in the difference of zoom curved tube corner feedback unit with the difference of technical scheme one.
In the technical scheme of the utility model two, become doubly a curve section of thick bamboo corner feedback unit includes that one is radial by magnetized multipolar magnetic ring 9 and an incremental magnetic encoder 8 of taking the attached circuit, the coaxial fixed mounting of multipolar magnetic ring 9 is in the rear end of becoming doubly a curve section of thick bamboo 4, incremental magnetic encoder 8 is vertical to be installed in the lateral part of ring flange, and incremental magnetic encoder 8's detection surface is on a parallel with the axial and relative and keep in a reasonable induction interval with multipolar magnetic ring 9, as shown in fig. 2.
The working principle of the second technical solution of the present invention is the same as that of the first technical solution, and will not be described in detail herein.
If the multi-pole magnetic ring 9 is coaxially and fixedly arranged at the front end of the zooming curve barrel 4, the pressing ring 1 is provided with a flange plate which is the same as that arranged at the rear end of the zooming lens barrel 3, and the arrangement method of the incremental magnetic encoder 8 is the same as that of the first technical scheme or the second technical scheme.
Claims (4)
1. A zooming core of an automatic zooming lens based on an incremental magnetic encoder comprises a front fixed component (13) and a rear fixed component (10) which are coaxially arranged at the front end and the rear end of a zooming lens barrel (3), the front zooming component (5) and the rear zooming component (6) are in clearance fit in the barrel body of the zooming lens barrel (3), an axial guide straight groove (14) is arranged on the barrel body of the zooming lens barrel (3), a zooming curve barrel (4) is sleeved on the zooming lens barrel (3), a front spiral driving groove and a rear spiral driving groove which correspond to the zooming component (5) and the compensating component (6) are arranged on the barrel body of the zooming curve barrel (4), a front pin (12) and a rear pin (11) are arranged in the guide straight groove (14) in a sliding manner, the two ends of the front pin (12) are connected with the zooming component (5) and the front spiral driving groove, the two ends of the rear pin (11) are respectively connected with the compensating component (6) and the rear spiral driving groove, the method is characterized in that: the zooming curve cylinder (4) is assembled with the zooming lens cone (3) through a front rolling bearing (2) and a rear rolling bearing (7), a zooming curve cylinder corner feedback unit is arranged between the zooming curve cylinder (4) and the zooming lens cone (3), the zooming curve cylinder corner feedback unit comprises a magnetized multi-pole magnetic ring (9) and an incremental magnetic encoder (8) with an auxiliary circuit, the incremental magnetic encoder is correspondingly arranged in an induction interval, and when the multi-pole magnetic ring (9) rotates relative to the incremental magnetic encoder (8), the magnetic pole center of the incremental magnetic encoder coincides with the center of a magnetic sensitive detector of the incremental magnetic encoder (8).
2. The zooming core of the automatic zooming lens based on the incremental magnetic encoder as recited in claim 1, wherein: the multi-pole magnetic ring (9) is coaxially and fixedly arranged on the zooming curve cylinder (4), and the incremental magnetic encoder (8) is fixedly arranged on the zooming lens cone (3).
3. The zooming core of the automatic zooming lens based on the incremental magnetic encoder as recited in claim 2, wherein: when the direction of the multi-pole magnetic ring (9) is axial, the detection surface of the incremental magnetic encoder (8) is perpendicular to the axial direction; when the multi-pole magnetic ring (9) is magnetized in the radial direction, the detection surface of the incremental magnetic encoder (8) is arranged in parallel to the axial direction.
4. The zooming core of the automatic zooming lens based on the incremental magnetic encoder as claimed in any one of claims 1 to 3, wherein: the variable-magnification curve cylinder corner feedback unit is arranged at the front end or the rear end of the variable-magnification curve cylinder (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921053985.9U CN210155381U (en) | 2019-07-08 | 2019-07-08 | Zooming core of automatic zooming lens based on incremental magnetic encoder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921053985.9U CN210155381U (en) | 2019-07-08 | 2019-07-08 | Zooming core of automatic zooming lens based on incremental magnetic encoder |
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| CN210155381U true CN210155381U (en) | 2020-03-17 |
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| CN201921053985.9U Active CN210155381U (en) | 2019-07-08 | 2019-07-08 | Zooming core of automatic zooming lens based on incremental magnetic encoder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487044A (en) * | 2020-05-22 | 2020-08-04 | 苏州天准科技股份有限公司 | Zoom lens |
| CN114764179A (en) * | 2021-01-04 | 2022-07-19 | 桂林方天光学仪器有限公司 | Electric control optical zoom system |
-
2019
- 2019-07-08 CN CN201921053985.9U patent/CN210155381U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111487044A (en) * | 2020-05-22 | 2020-08-04 | 苏州天准科技股份有限公司 | Zoom lens |
| CN111487044B (en) * | 2020-05-22 | 2022-03-25 | 苏州天准科技股份有限公司 | Zoom lens |
| CN114764179A (en) * | 2021-01-04 | 2022-07-19 | 桂林方天光学仪器有限公司 | Electric control optical zoom system |
| CN114764179B (en) * | 2021-01-04 | 2024-02-13 | 桂林方天光学仪器有限公司 | Electric control optical zoom system |
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