CN113917649B - High-precision optical lens focusing mechanism - Google Patents
High-precision optical lens focusing mechanism Download PDFInfo
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- CN113917649B CN113917649B CN202111213793.1A CN202111213793A CN113917649B CN 113917649 B CN113917649 B CN 113917649B CN 202111213793 A CN202111213793 A CN 202111213793A CN 113917649 B CN113917649 B CN 113917649B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
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Abstract
The invention belongs to the technical field of optical machinery and optical imaging equipment, and particularly relates to a high-precision optical lens focusing mechanism, which comprises: the lens barrel comprises a lens barrel body, a rotating wheel, a driving motor, an L-shaped wedge nail, a rotating wheel base, a rotating wheel external pressure sleeve, a camera body, a spring, a fixing screw and other parts. The lens focusing mechanism adopts a rotating wheel driving wedge nail to push the lens barrel main body to translate and finely tune. The mechanism does not adopt a threaded connection mounting structure of a general focusing system, but realizes the hole shaft matching mounting with very high processing precision through the outer wall of the lens barrel and the smooth inner wall of the cylindrical connecting barrel with higher precision, thereby avoiding the problems of optical axis deviation, inclination and the like caused by larger threaded matching tolerance. The lens barrel main body adopts a straight-forward movement mode, so that the problems of optical axis runout and the like caused by rotary focusing are avoided, the alignment precision and the imaging quality are effectively improved, and the lens barrel main body is suitable for application occasions with strict requirements on optical axis tolerance such as measurement, observation and aiming.
Description
Technical Field
The invention belongs to the technical field of optical machinery and optical imaging equipment, and particularly relates to a high-precision optical lens focusing mechanism.
Background
At present, the industrial lens is focused by adopting a mode of matching the lens with the camera connecting cylinder in a threaded manner, and as the processing precision of the threads is generally not high, the problems of large relative eccentricity, inclination and the like of the optical axis of the lens barrel and the vertical optical axis of the camera sensor are easy to occur, and the imaging quality, the precision and the like are greatly influenced. Traditional focusing mode needs to adopt rotatory mode to adjust lens cone axial position, can lead to optical axis position change, beat in the rotation in-process, can bring great extra error when being applied to scenes such as sight, measurement.
Disclosure of Invention
First, the technical problem to be solved
The invention aims to solve the technical problems that: in order to solve the foregoing problems, a straight-in high-precision focusing mechanism scheme without screw-fit is proposed.
(II) technical scheme
In order to solve the above technical problems, the present invention provides a high-precision optical lens focusing mechanism, the mechanism comprising:
the lens barrel main body is provided with an inclined annular groove near the tail part, and the inclined annular groove is used for being matched with the tip of the long end of the L-shaped wedge nail;
the four L-shaped wedge nails comprise long ends and short ends which are L-shaped, and the tips of the long ends are cut into alpha-degree sharp-angle conical shapes;
the device comprises a rotating wheel used for guiding the L-shaped wedge nail to move radially, a circle of outer edge gear is machined on the outer edge of the rotating wheel, four curve guide grooves used for being matched with the short ends of the L-shaped wedge nail are uniformly distributed on the inner surface of the rotating wheel, the width of each curve guide groove is equal to the diameter of the L-shaped wedge nail, and guide line parameters of the curve guide grooves are obtained by the relation between the rotating angle of the rotating wheel and the radial displacement corresponding to the wedge nail;
the runner base, its inside with 90 interval equipartition processing have four along radial and L shape wedge nail's long end matched with straight flute, straight flute width with L shape wedge nail's diameter, the degree of depth is the diameter half of L shape wedge nail, runner base outer fringe is equipped with the external screw thread, is used for fixing the runner external pressure cover.
The rotating wheel external pressure sleeve is provided with an internal thread, and one end of the rotating wheel external pressure sleeve is provided with an opening, and the rotating wheel external pressure sleeve is screwed up through the matching of the internal thread and the external thread on the rotating wheel base so as to restrict the rotating wheel to be in an axial position;
the camera body is provided with a cylindrical connecting cylinder with a smooth inner wall, the inner wall of the cylindrical connecting cylinder is a smooth finish surface, and the smooth finish surface and the outer wall of the lens barrel body are matched surfaces;
a spring for eliminating the fit clearance between the lens barrel body and the wedge and providing a contact pre-tightening force and a rebound force;
a fixing screw for fixing the lens barrel body;
and the driving motor is used for driving the rotating wheel and is provided with a driving gear meshed with the outer edge gear of the rotating wheel.
Wherein, the near tail part of the lens barrel body is cut to form an annular groove with an inclined plane, the inclined plane forms a certain included angle with the mechanical axis of the lens barrel body, and the included angle is defined as
The L-shaped wedge nails are four in number, a common cylindrical nail is bent for 90 degrees, the tip end of the L-shaped long end of the L-shaped wedge nail is machined into an alpha-degree sharp angle cone shape, and the plane of the L-shaped short end of the L-shaped wedge nail is polished smoothly.
Four curve guide grooves are uniformly distributed on the inner surface of the rotating wheel in a cutting mode at an angle of 90 degrees, guide line parameters of the curve guide grooves are obtained through the relation between the rotating angle of the rotating wheel and radial displacement corresponding to the wedge nail, and the radial movement precision of the wedge nail can be adjusted through setting and modifying the curve parameters of the curve guide grooves during design.
The camera body is provided with a cylindrical connecting cylinder, a reference plane is arranged in the cylindrical connecting cylinder and is parallel to a sensor photosurface in the camera body, a certain position on the outer wall surface of the cylindrical connecting cylinder is provided with a threaded through hole, four rectangular through holes are uniformly distributed on the outer wall surface at 90 degrees, and the position of the rectangular through holes is positioned at an inclined annular groove formed in the lens barrel body, so that radial movement of the wedge nails is not hindered.
The conical surfaces of the tips of the long ends of the four L-shaped wedge nails are in tangential fit with the inclined surfaces of the annular groove in the lens cone main body, the long ends of the L-shaped wedge nails are respectively embedded into the four straight grooves of the rotating wheel base and are in tangential contact with the inner walls of the straight grooves, the short ends of the L-shaped wedge nails are arranged in the four curved guide grooves of the rotating wheel, and the plane of the short ends is in plane contact with the plane of the curved guide grooves.
The driving motor is fixedly arranged on the outer pressure sleeve of the rotating wheel, a driving gear on a rotating shaft of the driving motor is meshed with an outer edge gear of the rotating wheel, the movement speed and the angle of the rotating wheel can be controlled by controlling the rotating speed and the rotating angle of the motor, the rotating wheel transmits power to the L-shaped wedge nail, the L-shaped wedge nail pushes the lens barrel main body to axially move, through the power transmission link, the rotating angle and the angular speed of the driving motor are in direct proportion to the axial movement displacement and the speed of the lens barrel main body, and the proportion coefficient depends on the gear ratio parameter of the driving gear and the outer edge gear of the rotating wheel, the guide line parameter of the curve guide groove and the conical angle parameter alpha of the tip end of the L-shaped wedge nail, and the movement precision of the lens barrel main body in the axial movement can be controlled by setting the parameters.
One end of the spring presses the tail end of the lens barrel main body, and the other end of the spring presses an internal datum plane of the camera body connecting cylinder, so that axial pretightening force is provided for the wedge nail and the lens barrel main body, and looseness in the focusing process is prevented.
The fixing screw penetrates through the threaded hole in the cylindrical connecting cylinder of the machine body and can be used for fixing the lens barrel main body after the optical system is focused in place.
The focusing process of the imaging system using the focusing mechanism is as follows:
and the driving motor is controlled to rotate to drive the lens barrel main body to perform axial translation fine adjustment, and the driving motor stops rotating when the imaging effect reaches the expected value, and the lens barrel main body is fastened by the fixing screw.
(III) beneficial effects
The invention provides a straight-in type high-precision focusing mechanism scheme without screw thread matching, which adopts a rotating wheel to drive wedge nails to push a lens barrel main body to translate and finely tune through matching of a precision machined hole shaft. The small optical axis eccentricity and inclination tolerance can be realized, and the better axial movement precision of the lens barrel can be achieved through the design of the gear ratio and the runner curve guide groove parameters.
Compared with the prior art, the technical scheme of the invention adopts the form of direct hole shaft matching of the outer wall of the lens cone and the inner wall of the cylindrical connecting cylinder of the sensor, avoids the problems of inclination, offset and the like of an optical axis caused by large matching tolerance of the traditional threaded connection, and can directly control the precision of optical axis alignment by controlling the machining tolerance of the hole shaft;
meanwhile, in the technical scheme of the invention, the lens barrel main body adopts a movement mode of straight movement rather than rotation and translation, so that the problems of optical axis jumping and the like caused by a precession mode are avoided.
Drawings
Fig. 1 is a cross-sectional view of a focusing mechanism according to an embodiment of the present invention. Wherein, 1-the lens barrel body; 2-wedge nailing; 3-rotating wheels; 4-a runner base; 5-rotating wheel external pressure sleeve; 6-a camera body with a connecting cylinder; 8-spring.
Fig. 2 is a view of the focusing mechanism according to the present invention. Wherein 7-driving the motor; 9-set screw.
Fig. 3 is a schematic cross-sectional view of a lens barrel according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a curve guide groove of a transfer wheel in the technical scheme of the invention.
Fig. 5 is a schematic view of a wheel base in the technical scheme of the invention.
Detailed Description
In order to solve the above technical problems, the present invention provides a high-precision optical lens focusing mechanism, the mechanism comprising:
the lens barrel main body is provided with an inclined annular groove near the tail part, and the inclined annular groove is used for being matched with the tip of the long end of the L-shaped wedge nail;
the four L-shaped wedge nails comprise long ends and short ends which are L-shaped, and the tips of the long ends are cut into alpha-degree sharp-angle conical shapes;
the device comprises a rotating wheel used for guiding the L-shaped wedge nail to move radially, a circle of outer edge gear is machined on the outer edge of the rotating wheel, four curve guide grooves used for being matched with the short ends of the L-shaped wedge nail are uniformly distributed on the inner surface of the rotating wheel, the width of each curve guide groove is equal to the diameter of the L-shaped wedge nail, and guide line parameters of the curve guide grooves are obtained by the relation between the rotating angle of the rotating wheel and the radial displacement corresponding to the wedge nail;
the runner base, its inside with 90 interval equipartition processing have four along radial and L shape wedge nail's long end matched with straight flute, straight flute width with L shape wedge nail's diameter, the degree of depth is the diameter half of L shape wedge nail, runner base outer fringe is equipped with the external screw thread, is used for fixing the runner external pressure cover.
The rotating wheel external pressure sleeve is provided with an internal thread, and one end of the rotating wheel external pressure sleeve is provided with an opening, and the rotating wheel external pressure sleeve is screwed up through the matching of the internal thread and the external thread on the rotating wheel base so as to restrict the rotating wheel to be in an axial position;
the camera body is provided with a cylindrical connecting cylinder with a smooth inner wall, the inner wall of the cylindrical connecting cylinder is a smooth finish surface, and the smooth finish surface and the outer wall of the lens barrel body are matched surfaces;
a spring for eliminating the fit clearance between the lens barrel body and the wedge and providing a contact pre-tightening force and a rebound force;
a fixing screw for fixing the lens barrel body;
and the driving motor is used for driving the rotating wheel and is provided with a driving gear meshed with the outer edge gear of the rotating wheel.
Wherein, the near tail part of the lens barrel body is cut to form an annular groove with an inclined plane, the inclined plane forms a certain included angle with the mechanical axis of the lens barrel body, and the included angle is defined as
The L-shaped wedge nails are four in number, a common cylindrical nail is bent for 90 degrees, the tip end of the L-shaped long end of the L-shaped wedge nail is machined into an alpha-degree sharp angle cone shape, and the plane of the L-shaped short end of the L-shaped wedge nail is polished smoothly.
Four curve guide grooves are uniformly distributed on the inner surface of the rotating wheel in a cutting mode at an angle of 90 degrees, guide line parameters of the curve guide grooves are obtained through the relation between the rotating angle of the rotating wheel and radial displacement corresponding to the wedge nail, and the radial movement precision of the wedge nail can be adjusted through setting and modifying the curve parameters of the curve guide grooves during design.
The camera body is provided with a cylindrical connecting cylinder, a reference plane is arranged in the cylindrical connecting cylinder and is parallel to a sensor photosurface in the camera body, a certain position on the outer wall surface of the cylindrical connecting cylinder is provided with a threaded through hole, four rectangular through holes are uniformly distributed on the outer wall surface at 90 degrees, and the position of the rectangular through holes is positioned at an inclined annular groove formed in the lens barrel body, so that radial movement of the wedge nails is not hindered.
The conical surfaces of the tips of the long ends of the four L-shaped wedge nails are in tangential fit with the inclined surfaces of the annular groove in the lens cone main body, the long ends of the L-shaped wedge nails are respectively embedded into the four straight grooves of the rotating wheel base and are in tangential contact with the inner walls of the straight grooves, the short ends of the L-shaped wedge nails are arranged in the four curved guide grooves of the rotating wheel, and the plane of the short ends is in plane contact with the plane of the curved guide grooves.
The driving motor is fixedly arranged on the outer pressure sleeve of the rotating wheel, a driving gear on a rotating shaft of the driving motor is meshed with an outer edge gear of the rotating wheel, the movement speed and the angle of the rotating wheel can be controlled by controlling the rotating speed and the rotating angle of the motor, the rotating wheel transmits power to the L-shaped wedge nail, the L-shaped wedge nail pushes the lens barrel main body to axially move, through the power transmission link, the rotating angle and the angular speed of the driving motor are in direct proportion to the axial movement displacement and the speed of the lens barrel main body, and the proportion coefficient depends on the gear ratio parameter of the driving gear and the outer edge gear of the rotating wheel, the guide line parameter of the curve guide groove and the conical angle parameter alpha of the tip end of the L-shaped wedge nail, and the movement precision of the lens barrel main body in the axial movement can be controlled by setting the parameters.
One end of the spring presses the tail end of the lens barrel main body, and the other end of the spring presses an internal datum plane of the camera body connecting cylinder, so that axial pretightening force is provided for the wedge nail and the lens barrel main body, and looseness in the focusing process is prevented.
The fixing screw penetrates through the threaded hole in the cylindrical connecting cylinder of the machine body and can be used for fixing the lens barrel main body after the optical system is focused in place.
The focusing process of the imaging system using the focusing mechanism is as follows:
and the driving motor is controlled to rotate to drive the lens barrel main body to perform axial translation fine adjustment, and the driving motor stops rotating when the imaging effect reaches the expected value, and the lens barrel main body is fastened by the fixing screw.
The present application is described in further detail below with reference to the accompanying drawings by way of specific embodiments. This application may be embodied in many different forms and is not limited to the specific implementations described in this embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure.
However, one skilled in the relevant art will recognize that the detailed description of one or more of the specific details may be omitted, or that other methods, components, or materials may be used. In some instances, some embodiments are not described or described in detail.
Furthermore, the features and aspects described herein may be combined in any suitable manner in one or more embodiments. It will be readily understood by those skilled in the art that the steps or order of operation of the methods associated with the embodiments provided herein may also be varied. Thus, any order in the figures and examples is for illustrative purposes only and does not imply that a certain order is required unless explicitly stated that a certain order is required.
Example 1
Fig. 1 to 5 show an embodiment of a high-precision optical lens focusing scheme, as shown in the sectional view of fig. 1 and the outline view of fig. 2, the scheme including: the lens barrel comprises a lens barrel body 1, L-shaped wedge nails 2, a rotating wheel 3 with a curve guide groove, a rotating wheel base 4, a rotating wheel external pressure sleeve 5, a camera body 6, a driving motor 7, a spring 8 and a fixing screw 9;
wherein: as shown in fig. 3, the lens barrel body 1 is processed near the tail end to form an annular groove 1a with an inclined surface; the inclined plane forms an included angle with the mechanical axis of the lens barrel main body 1Is that
As shown in fig. 1, the number of the L-shaped wedge nails 2 is four, which can be regarded as a common cylindrical nail which is bent by 90 degrees, the tip 2a of the long end of the L-shaped wedge nail is cut into an alpha-degree sharp-angle cone shape, and the plane 2b of the short end of the L-shaped wedge nail is polished smoothly;
as shown in fig. 4, a circle of outer edge gears 3b are machined on the outer edge of the rotating wheel 3; simultaneously, four curve guide grooves 3a are uniformly distributed and cut on the inner surface of the wedge nail 2 at 90 degrees, the width of each curve guide groove 3a is equal to the diameter of the L-shaped wedge nail 2, the guide line parameters of the curve guide grooves 3a are obtained by the relation between the rotation angle of the rotating wheel 3 and the corresponding radial displacement of the wedge nail 2, and the radial movement precision of the wedge nail 2 can be adjusted by setting and modifying the guide curve parameters of the curve guide grooves 3a during design.
As shown in fig. 5, four straight grooves 4a uniformly distributed at 90 ° are machined in the rotating wheel base 4 in the radial direction, the width of each straight groove is the same as the diameter of the wedge nail 2, the depth is half of the diameter of the wedge nail 2, and external threads 4b are arranged on the outer edge of the rotating wheel base 4 and used for fixing the rotating wheel external pressure sleeve 5.
As shown in fig. 1, the outer pressing sleeve 5 of the rotating wheel is matched and screwed with the outer thread 4b on the rotating wheel base 4 through the inner thread 5a so as to restrict the rotating wheel 3 to be in the axial position.
The camera body 6 has a cylindrical connecting cylinder 6a, a reference plane 6b is provided in the cylindrical connecting cylinder 6a, the reference plane is parallel to a sensor light sensing surface 6c in the camera body 6, the inner wall of the cylindrical connecting cylinder 6a is a smooth finish surface, the smooth finish surface is a matching surface with the outer wall of the lens barrel body 1, a threaded through hole 6d is provided at a certain position on the outer wall surface of the cylindrical connecting cylinder 6a, four through holes 6e are uniformly formed on the outer wall surface at 90 DEG, and the positions are positioned at an inclined annular groove 1a formed on the lens barrel body 1 so that radial movement of the wedge 2 is not hindered.
The long end conical surfaces of the four L-shaped wedge nails 2 are tangentially assembled with the inclined surface 1a of the annular groove in the lens barrel main body 1, the long ends of the L-shaped wedge nails are embedded into four straight grooves 4a of the rotating wheel base 4 and are tangentially contacted with the inner walls of the straight grooves 4a, the short ends of the L-shaped wedge nails are installed into four curved guide grooves 3a of the rotating wheel 3, and the short end planes 2b are contacted with the groove planes;
as shown in FIG. 4, the curve guiding groove 3a of the inner wall of the runner determines the relation between the rotation angle of the runner 3 and the radial displacement of the wedge 2, and the rotation angle dθ of the runner 3 and the radial displacement dr of the wedge 2 are set to satisfy the linear relation, namely
dr＝kdθ (1)
Where k is the scaling factor;
the integral yields the equation for the center line of the curved guide groove 3a of the wheel 3 in polar coordinates:
r＝kθ+r 0 (2)
wherein r is 0 The initial position of the curve guiding groove is determined by the geometric dimension factor of the part; during design, through modification and setting of the curve guide groove 3a guide line parameter k, the relation between the rotation angle of the rotating wheel 3 and the radial movement displacement of the wedge nail 2 can be changed, and the movement precision of the wedge nail 2 can be adjusted.
Since the tip 2a of the wedge 2 is a conical surface with an angle α, the displacement dr of the wedge 2 in the radial direction and the displacement ds of the barrel body 1 in the axial direction satisfy the following relationship, namely
Thereby, the axial movement precision of the lens barrel body 1 can be set by changing the parameter alpha in the design stage;
as shown in fig. 2, a driving gear 7a mounted on the driving motor 7 is meshed with an outer edge gear 3b of the rotating wheel 3, and the movement speed and the movement angle of the rotating wheel 3 can be controlled by controlling the rotation speed and the rotation angle of the motor 7, and the gear ratio M of the outer edge gear 3b and the driving gear 7a, the driving motor 7 and the rotation angle dθ of the rotating wheel 3 M The dθ relationship is as follows:
wherein N is s For the number of teeth of the outer gear 3b, N M For driving the gear 7a number of teeth. The rotation of the rotating wheel 3 drives the wedge nail 2 to move radially, and the wedge nail 2 pushes the lens barrel main body 1 to move axially through contact fit, and the wedge nail is obtained by (1) (3) (4):
rotation angle dθ of driving motor 7 M The axial displacement ds of the lens barrel body 1 is proportional to the gear ratio M, the guide line parameter of the curved guide groove 3a of the turning wheel 3, and the angle of the tip 2a of the wedge 2, and a desired axial displacement accuracy of the lens barrel body 1 can be obtained by setting these parameters.
As shown in fig. 1, one end of the spring 8 presses the tail end of the lens barrel body 1, and the other end presses the reference plane 6a inside the connecting barrel of the camera body 6, so as to provide axial pretightening force for the wedge nail 2 and the lens barrel body 1, and prevent looseness in the focusing process.
As shown in fig. 2, the fixing screw 9 passes through the threaded through hole 6d on the body cylindrical connecting tube 6a, and can be used to fix the lens barrel body 1 after the optical system is focused in place.
The focusing process of the imaging system using the scheme is as follows: the lens barrel body 1 is driven to conduct axial translation fine adjustment by controlling the driving motor 7 to rotate, the driving motor 7 is stopped rotating when the imaging effect reaches the expected value, and finally the lens barrel body 1 is fastened by the fixing screw 9.
In summary, the present invention belongs to the technical field of optical machinery and optical imaging devices, and in particular relates to a high-precision optical lens focusing mechanism, which comprises: the tail end is cut into a lens cone body with a chute, a rotating wheel with a curve guide groove and an outer edge gear, a driving motor with a driving gear, an L-shaped wedge nail, a rotating wheel base with four 90-degree uniformly distributed straight grooves in the radial direction, a rotating wheel external pressing sleeve, a camera body with a smooth inner wall cylindrical connecting cylinder, a spring, a fixing screw and other parts. The lens focusing mechanism adopts a rotating wheel driving wedge nail to push the lens barrel main body to translate and finely tune. The mechanism does not adopt a threaded connection mounting structure of a general focusing system, but realizes the hole shaft matching mounting with very high processing precision through the outer wall of the lens barrel and the smooth inner wall of the cylindrical connecting barrel with higher precision, thereby avoiding the problems of optical axis deviation, inclination and the like caused by larger threaded matching tolerance. The lens barrel main body adopts a straight-forward movement mode, so that the problems of optical axis runout and the like caused by rotary focusing are avoided, the alignment precision and the imaging quality are effectively improved, and the lens barrel main body is suitable for application occasions with strict requirements on optical axis tolerance such as measurement, observation and aiming.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (10)
1. A high precision optical lens focusing mechanism, the mechanism comprising:
the four L-shaped wedge nails comprise long ends and short ends which are L-shaped, and the tips of the long ends are cut into alpha-degree sharp-angle conical shapes;
the lens barrel body is provided with an inclined annular groove near the tail part, and the inclined annular groove is used for being matched with the tip of the long end of the L-shaped wedge nail;
the device comprises a rotating wheel used for guiding the L-shaped wedge nail to move radially, a circle of outer edge gear is machined on the outer edge of the rotating wheel, four curve guide grooves used for being matched with the short ends of the L-shaped wedge nail are uniformly distributed on the inner surface of the rotating wheel, the width of each curve guide groove is equal to the diameter of the L-shaped wedge nail, and guide line parameters of the curve guide grooves are obtained by the relation between the rotating angle of the rotating wheel and the radial displacement corresponding to the wedge nail;
the rotating wheel base is internally and uniformly provided with four straight grooves which are matched with the long ends of the L-shaped wedge nails along the radial direction at 90-degree intervals, the width of each straight groove is the same as the diameter of each L-shaped wedge nail, the depth is half of the diameter of each L-shaped wedge nail, and the outer edge of the rotating wheel base is provided with external threads for fixing the rotating wheel external pressure sleeve;
the rotating wheel external pressure sleeve is provided with an internal thread, and one end of the rotating wheel external pressure sleeve is provided with an opening, and the rotating wheel external pressure sleeve is screwed up through the matching of the internal thread and the external thread on the rotating wheel base so as to restrict the rotating wheel to be in an axial position;
the camera body is provided with a cylindrical connecting cylinder with a smooth inner wall, the inner wall of the cylindrical connecting cylinder is a smooth finish surface, and the smooth finish surface and the outer wall of the lens barrel body are matched surfaces;
a spring for eliminating the fit clearance between the lens barrel body and the wedge and providing a contact pre-tightening force and a rebound force;
a fixing screw for fixing the lens barrel body;
and the driving motor is used for driving the rotating wheel and is provided with a driving gear meshed with the outer edge gear of the rotating wheel.
2. The focusing mechanism of claim 1, wherein the lens barrel body is formed into an annular groove with a bevel surface near the tail part by cutting, and the bevel surface forms a certain included angle with the mechanical axis of the lens barrel body, and the included angle is defined as
3. The high-precision optical lens focusing mechanism as claimed in claim 2, wherein the number of the L-shaped wedge nails is four, the L-shaped wedge nails are a common cylindrical nail which is bent for 90 degrees, the tip of the L-shaped long end is cut into an alpha-degree sharp cone shape, and the plane of the L-shaped short end is polished smoothly.
4. The high-precision optical lens focusing mechanism as claimed in claim 3, wherein four curve guide grooves are uniformly cut on the inner surface of the rotating wheel at 90 degrees, guide line parameters of the curve guide grooves are obtained by the relation between the rotating angle of the rotating wheel and the corresponding radial displacement of the wedge, and the radial movement precision of the wedge can be adjusted by setting and modifying the curve parameters of the curve guide grooves during design.
5. The high-precision optical lens focusing mechanism as recited in claim 4, wherein a reference plane is provided inside the cylindrical connecting cylinder, the reference plane is parallel to the sensor photosurface in the camera body, a threaded through hole is provided at a certain position on the outer wall surface of the cylindrical connecting cylinder, four rectangular through holes are uniformly formed on the outer wall surface at 90 ° and are positioned at the inclined annular groove formed on the lens barrel body, so that radial movement of the wedge is not hindered.
6. The high-precision optical lens focusing mechanism according to claim 5, wherein conical surfaces of long end tips of the four L-shaped wedge nails are tangentially matched with inclined surfaces of annular grooves in the lens barrel main body, the L-shaped long ends are respectively embedded into four straight grooves mounted in the runner base and tangentially contacted with inner walls of the straight grooves, the L-shaped short ends are mounted in four curved guide grooves of the runner, and the short end planes are contacted with the curved guide groove planes.
7. The high-precision optical lens focusing mechanism as claimed in any one of claims 1 to 6, wherein the driving motor is fixedly installed on the outer pressing sleeve of the rotating wheel, a driving gear on a rotating shaft of the driving motor is meshed with an outer edge gear of the rotating wheel, the moving speed and angle of the rotating wheel can be controlled by controlling the rotating speed and the rotating angle of the motor, the rotating wheel transmits power to the L-shaped wedge nail, the L-shaped wedge nail pushes the lens barrel body to axially move, the rotating angle and the angular speed of the driving motor are in direct proportion to the axial movement displacement and the speed of the lens barrel body through the power transmission link, and the proportion coefficient is dependent on the gear ratio parameter of the driving gear and the outer edge gear of the rotating wheel, the guide line parameter of the curve guide groove and the conical angle parameter alpha of the tip end of the L-shaped wedge nail, and the moving precision of the lens barrel body in the axial movement can be controlled through setting the parameters.
8. The high-precision optical lens focusing mechanism as recited in claim 7, wherein one end of the spring presses the tail end of the lens barrel body, and the other end presses the internal reference plane of the camera body connecting cylinder, so that axial pretightening force is provided for the wedge pin and the lens barrel body, and looseness is prevented in focusing.
9. The high-precision optical lens focusing mechanism as recited in claim 8, wherein the fixing screw passes through a threaded through hole in the cylindrical connecting barrel and is used for fixing the lens barrel body after the optical system is focused in place.
10. The high-precision optical lens focusing mechanism according to claim 9, wherein the focusing process of the imaging system using the focusing mechanism is:
and the driving motor is controlled to rotate to drive the lens barrel main body to perform axial translation fine adjustment, and the driving motor stops rotating when the imaging effect reaches the expected value, and the lens barrel main body is fastened by the fixing screw.
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| CN202111213793.1A CN113917649B (en) | 2021-10-19 | 2021-10-19 | High-precision optical lens focusing mechanism |
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| CN202111213793.1A CN113917649B (en) | 2021-10-19 | 2021-10-19 | High-precision optical lens focusing mechanism |
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| CN113917649B true CN113917649B (en) | 2024-02-27 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01164409U (en) * | 1988-04-30 | 1989-11-16 | ||
| CN104965292A (en) * | 2015-07-14 | 2015-10-07 | 福建福光股份有限公司 | Large-target-surface and high-resolution day and night lens and use method thereof |
| CN106772962A (en) * | 2016-12-28 | 2017-05-31 | 中国科学院长春光学精密机械与物理研究所 | A kind of active optics Hartmann focusing lens |
| CN108983387A (en) * | 2018-09-05 | 2018-12-11 | 北京富吉瑞光电科技有限公司 | A kind of infrared lens focus control |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3875913B2 (en) * | 2002-05-10 | 2007-01-31 | ペンタックス株式会社 | Optical unit with optical positioning adjustment mechanism |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01164409U (en) * | 1988-04-30 | 1989-11-16 | ||
| CN104965292A (en) * | 2015-07-14 | 2015-10-07 | 福建福光股份有限公司 | Large-target-surface and high-resolution day and night lens and use method thereof |
| CN106772962A (en) * | 2016-12-28 | 2017-05-31 | 中国科学院长春光学精密机械与物理研究所 | A kind of active optics Hartmann focusing lens |
| CN108983387A (en) * | 2018-09-05 | 2018-12-11 | 北京富吉瑞光电科技有限公司 | A kind of infrared lens focus control |
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| CN113917649A (en) | 2022-01-11 |
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