CN109307916A - A kind of lens focusing method, focus adjusting mechanism and camera lens - Google Patents
A kind of lens focusing method, focus adjusting mechanism and camera lens Download PDFInfo
- Publication number
- CN109307916A CN109307916A CN201710631424.1A CN201710631424A CN109307916A CN 109307916 A CN109307916 A CN 109307916A CN 201710631424 A CN201710631424 A CN 201710631424A CN 109307916 A CN109307916 A CN 109307916A
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- lens
- straight pin
- cylindrical cam
- sleeve
- cam sleeve
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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
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
Abstract
The present invention relates to technical field of optical, specifically disclose a kind of lens focusing mechanism, including focusing bracelet, fixed cylinder, at least one straight pin and cylindrical cam sleeve；The external cylindrical surface of the cylindrical cam sleeve is provided with multiple thread, is provided with the multiple thread matched with the cylindrical cam sleeve on the inside of the fixed cylinder；At least one cam path is arranged radially on the cylindrical cam sleeve, in lens barrel outer circle, the straight pin and the cam path correspond the straight pin radial equipartition；The fixed cylinder is fixedly connected with the camera lens, and the cylindrical cam sleeve is sheathed in the fixed cylinder, and the cylindrical cam sleeve is connect by the cam path and the straight pin with the lens barrel, and the focusing bracelet is fixedly connected with the cylindrical cam sleeve.Focus adjusting mechanism of the invention effectively reduces friction, precisely focusing, reliable and stable beneficial effect.
Description
Technical field
The present invention relates to technical field of optical, in particular to a kind of lens focusing method, focus adjusting mechanism and camera lens.
Background technique
Lens focusing is the most common function of camera lens, and lens focusing passes through the tune manually or on electronic rotation camera lens
Burnt ring realizes the linear motion of lens barrel, to realize the focusing function of camera lens.Industry now and business lens focusing are generally logical
Cylindrical cam sleeve is crossed to realize, the lens barrel for needing to move along a straight line is realized in the rotation by cylindrical cam sleeve relative to lens barrel
Linear motion, to realize focusing function.The rotation of cylindrical cam sleeve generally has electronic and manual two ways.Electric adjustable
Coke needs to process the structures such as gear on cylindrical cam sleeve to be matched with motor；Manual focusing needs on cylindrical cam sleeve
The lines of the hand easy to process that can be manually rotated.There are two types of connections between cylindrical cam sleeve and camera lens, and one is cylindrical cam sleeves
Inner circle and camera lens outer circle directly contact, one is the intermediate machines such as steel ball by adding circumference uniform distribution at cylindrical cam both ends
Structure erects cylindrical cam relative to camera lens.Obvious first way will cause cylindrical cam sleeve inner circle and camera lens outer circle it
Between friction, bring resistance and unstable factor to entire rotary motion, and then influence the feel and precision of rotation, or even occur
Caton phenomenon.Although second method avoids the direct contact of cylindrical cam sleeve inner circle and camera lens outer circle, by sliding friction
It is changed to rolling friction, but many steel ball of circumference uniform distribution will increase the caliber size of total, and a large amount of steel ball
It will increase the complexity of assembly and reduce the reliability of system.
Summary of the invention
Existing focus adjusting mechanism stability is poor, frictional force is big, the technological deficiency of easy Caton the present invention is directed to overcoming, and provides one kind
Lens focusing mechanism.
To achieve the above object, the invention adopts the following technical scheme:
On the one hand, the present invention provides a kind of lens focusing mechanism, including
Including focusing bracelet, fixed cylinder, at least one straight pin and cylindrical cam sleeve；
The external cylindrical surface of the cylindrical cam sleeve is provided with multiple thread, is provided with and the circle on the inside of the fixed cylinder
The multiple thread that column cam sleeve matches；
At least one cam path is arranged radially on the cylindrical cam sleeve, the straight pin radial equipartition is outside lens barrel
On circle, the straight pin and the cam path are corresponded；
The fixed cylinder is fixedly connected with the camera lens, and the cylindrical cam sleeve is sheathed in the fixed cylinder, described
Cylindrical cam sleeve is connect by the cam path and the straight pin with the lens barrel, and the focusing bracelet and the cylinder are convex
Wheel sleeve is fixedly connected；
When focusing, the focusing bracelet drives the cylindrical cam sleeve rotating, and the cylindrical cam sleeve is relative to institute
Fixed cylinder back-out is stated, the cam path rotates and the straight pin is driven to move, and the lens barrel is under the drive of the straight pin
It is moved forward and backward relative to the fixed cylinder.
In some embodiments, the straight pin outer diameter and the cam path are of same size, form clearance fit.
In some embodiments, the multiple thread quantity is 6-12 head.
In some embodiments, the cam path is penetrating cam path, and quantity is 3, and 120 ° of cam path intervals are equal
On cylindrical cam sleeve described in cloth.
In some embodiments, hole is threaded on the lens barrel external cylindrical surface, the straight pin lower end is threaded
Column, the straight pin, which is connected through a screw thread, to be screwed on lens barrel.
In some embodiments, the cam path is distributed in the cylindrical cam sleeve according to the rule of curvilinear equation Y=KX
On, wherein Y is the movement position of lens barrel, and X is that cam path rotates corresponding arc length, and K is the proportionality coefficient of the lens barrel equation of motion.
On the other hand, a kind of camera lens, including above-mentioned lens focusing mechanism are also provided, further include camera lens and lens barrel.
In another aspect, also providing a kind of lens focusing method, focused using above-mentioned lens focusing mechanism, including with
Lower step:
Rotation focusing bracelet, drives cylindrical cam sleeve rotating；
Cylindrical cam sleeve is screwed out by multiple-threaded cooperation relative to the fixed cylinder；
The cam path rotation drives the straight pin movement；
The straight pin drives the lens barrel to move forward and backward relative to the fixed cylinder.
The beneficial effects of the present invention are: this method is passed through by processing multiple thread in cylindrical cam excircle of sleeve
The rotation of cam sleeve is realized in multiple thread rotation.Since multiple thread spin stabilization is smooth and accuracy, focusing is improved
Precision greatly reduces frictional force, avoids pause and transition in rhythm or melody sense, especially for manual focusing, considerably improves the feel of system.Again
Due to not introducing the mechanism of complex redundancy to system, the stability series and reliability of system are guaranteed, and assemble also very simple
It is single.
Detailed description of the invention
Fig. 1 is the structural schematic diagram according to the lens focusing mechanism of one embodiment of the invention；
Fig. 2 is the structural schematic diagram according to the cylindrical cam sleeve of one embodiment of the invention；
Fig. 3 is the structural schematic diagram of straight pin in one embodiment of the invention.
Appended drawing reference:
1 cylindrical cam sleeve, 2 fixed cylinder
3 lens barrels 4 focusing bracelet
5 straight pin, 21 cam path
22 multiple threads
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing and specific implementation
Example, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only to explain this hair
It is bright, but not to limit the present invention.
The principle of the present invention are as follows: this method passes through bull spiral shell by processing multiple thread in cylindrical cam excircle of sleeve
The rotation of cam sleeve is realized in line rotation.Since multiple thread spin stabilization is smooth, frictional force is greatly reduced, pause and transition in rhythm or melody is avoided
Sense, especially for manual focusing, considerably improves the feel of system.Again due to not to the machine of system introducing complex redundancy
Structure, the stability series and reliability of system are guaranteed, and assemble also very simple.
The solution of the present invention is further elaborated with reference to the accompanying drawing.
Referring to Fig. 1, for the structural schematic diagram of lens focusing mechanism in one embodiment of the invention.Lens barrel 3 is to need phase
For the lens carrier of camera lens linear motion, focussing process is both the process that lens barrel 3 moves along a straight line relative to camera lens.This implementation
In example, lens focusing mechanism includes focusing bracelet 4, fixed cylinder 2, at least one straight pin 5 and cylindrical cam sleeve 1.
The external cylindrical surface of cylindrical cam sleeve 1 is provided with multiple thread 22, is provided on the inside of fixed cylinder 2 and cylindrical cam set
The multiple thread (not shown) that 1 number of cylinder equally matches.In the present embodiment, 22 quantity of multiple thread is 6-12 head.
At least one penetrating cam path 21 is arranged radially on cylindrical cam sleeve 1,5 radial equipartition of straight pin is in lens barrel
In 3 outer circles, 5 quantity of straight pin is consistent with 21 quantity of cam path, and corresponds with cam path 21.5 outer diameter of straight pin and cam
Slot 21 is of same size, forms clearance fit.Fixed cylinder 2 is fixedly connected with camera lens, and cylindrical cam sleeve 1 is sheathed in fixed cylinder 2,
Cylindrical cam sleeve 1 is connect by cam path 21 and straight pin 5 with lens barrel 3, focusing bracelet 4 and the fixed company of cylindrical cam sleeve 1
It connects.Referring to Fig. 2, in embodiment, the structural schematic diagram of cylindrical cam sleeve 1.In 1 outer circle of cylindrical cam sleeve as shown in the figure
The multiple thread 22 of setting and the structure of cam path 21.The rule design cam path 21 given according to lens optical designer,
It can be given equation line and be also possible to the curve that multiple points fit.Cylindrical cam sleeve 1 is arranged in cam path 21
It is penetrating on external cylindrical surface and uniformly distributed.
In the present embodiment, straight pin 5, which is connected through a screw thread, to be screwed on lens barrel 3.Specifically, it is processed on 3 external cylindrical surface of lens barrel
There is threaded hole, 5 lower end of straight pin is threaded column.The specific structure is shown in FIG. 3 for straight pin 5.
Straight pin 5 and cam path 21 are all evenly arranged in cylinder outer circle, in one embodiment of the invention, cam path
21 are arranged radially three on cylindrical cam sleeve 1, and every 120 ° are arranged one；Straight pin 5 is also correspondingly arranged three, and 120 ° uniformly distributed
On lens barrel 3.Since 5 head outer diameter of straight pin clearance fit consistent with 21 groove width size of cam path namely straight pin 5 are in cam
Sliding, straight pin 5 are being moved according to the design rule of cam path 21 in slot 21.In an embodiment of the invention, straight pin 5
Portion's outer diameter is 3mm, and the groove width of cam path 21 is also 3mm, and given tolerance is negative value when 5 head outer diameter of straight pin is processed, after processing
In 2.99~2.95mm or so, 21 width of cam path is given as after positive value processing as 3.005~3.01mm, such clearance fit,
Labour union is moved than smoother not clamping stagnation.
In one embodiment of the invention, optical design requirements lens barrel 3 will in 120 ° the fixed position of opposite camera lens to
Preceding mobile 27mm, and need uniform motion.According to this requirement, it is straight line Y=that setting cam path 21, which winds curvilinear equation,
KX, Y are the movement positions (starting as 0 terminal to be 27mm) of lens barrel 3, and X is that cam path 21 rotates corresponding arc length, X then from 0 to
120 degree.Preferably, the radius of cylindrical cam is 30.5mm, so the value range of X is 0~30.5x2 π/3, the value of K can lead to
The Y value 27mm for crossing final position is obtained divided by π/3 end point values 30.5x2 of X, i.e., equation is Y=0.422673X.K is the fortune of lens barrel 3
The proportionality coefficient of dynamic equation.
In the present embodiment, focussing process are as follows: rotation focusing bracelet 4 drives cylindrical cam sleeve 1 to rotate, cylindrical cam set
Cylinder 1 screws out (between cooperate for multiple thread 22) relative to fixed cylinder 2, and the rotation of cam path 21 of cylindrical cam sleeve 1 drives circle
Pin 5 moves, to realize rotation of the lens barrel 3 relative to fixed cylinder 2.
In addition, invention additionally discloses a kind of camera lens, including above-mentioned focus adjusting mechanism, it further include camera lens and lens barrel 3.
More, it invention additionally discloses a kind of lens focusing method, is focused using above-mentioned lens focusing mechanism, specifically
Step are as follows:
Rotation focusing bracelet 4, drives cylindrical cam sleeve 1 to rotate；
Cylindrical cam sleeve 1 passes through the cooperation of multiple thread 22, screws out relative to fixed cylinder 2；
The rotation of cam path 21 drives straight pin 5 to move；
Straight pin 5 is moved forward and backward with moving lens barrel 3 relative to fixed cylinder 2.
By processing multiple thread 22 on 1 outer ring of cylindrical cam sleeve, is rotated by multiple thread 22 and realize that cylinder is convex
The rotation of wheel sleeve 1.Since 22 spin stabilization of multiple thread is smooth, frictional force is greatly reduced, avoids pause and transition in rhythm or melody sense, especially
For manual focusing, the feel of system is considerably improved.Again due to not to system introducing complex redundancy mechanism, system it is steady
Fixed system and reliability are guaranteed, and assemble also very simple.
The above described specific embodiments of the present invention are not intended to limit the scope of the present invention..Any basis
Any other various changes and modifications made by technical concept of the invention should be included in the guarantor of the claims in the present invention
It protects in range.
Claims (8)
1. a kind of lens focusing mechanism, which is characterized in that convex including focusing bracelet, fixed cylinder, at least one straight pin and cylinder
Wheel sleeve；
The external cylindrical surface of the cylindrical cam sleeve is provided with multiple thread, is provided on the inside of the fixed cylinder convex with the cylinder
The multiple thread that wheel sleeve matches；
At least one cam path is arranged radially on the cylindrical cam sleeve, the straight pin radial equipartition is in lens barrel outer circle
On, the straight pin and the cam path correspond；
The fixed cylinder is fixedly connected with the camera lens, and the cylindrical cam sleeve is sheathed in the fixed cylinder, the cylinder
Cam sleeve is connect by the cam path and the straight pin with the lens barrel, the focusing bracelet and the cylindrical cam set
Cylinder is fixedly connected.
2. lens focusing mechanism as described in claim 1, which is characterized in that the straight pin outer diameter and the cam path width
It is identical, form clearance fit.
3. lens focusing mechanism as described in claim 1, which is characterized in that the multiple thread quantity is 6-12 head.
4. lens focusing mechanism as described in claim 1, which is characterized in that the cam path is penetrating cam path, quantity
It is 3,120 ° of the cam path is uniformly at intervals on the cylindrical cam sleeve.
5. lens focusing mechanism as described in claim 1, which is characterized in that be threaded on the lens barrel external cylindrical surface
Hole, the straight pin lower end are threaded column, and the straight pin, which is connected through a screw thread, to be screwed on lens barrel.
6. lens focusing mechanism as described in claim 1, which is characterized in that the cam path is according to curvilinear equation Y=KX's
Rule is distributed on the cylindrical cam sleeve, wherein Y is the movement position of lens barrel, and X is that cam path rotates corresponding arc length, K
For the proportionality coefficient of the lens barrel equation of motion.
7. a kind of camera lens, which is characterized in that further include mirror including lens focusing mechanism as claimed in any one of claims 1 to 6
Head and lens barrel.
8. a kind of lens focusing method, which is characterized in that adjusted using the lens focusing mechanism as described in claim 1-6
It is burnt, comprising the following steps:
Rotation focusing bracelet, drives cylindrical cam sleeve rotating；
Cylindrical cam sleeve is screwed out by multiple-threaded cooperation relative to the fixed cylinder；
The cam path rotation drives the straight pin movement；
The straight pin drives the lens barrel to move forward and backward relative to the fixed cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710631424.1A CN109307916B (en) | 2017-07-28 | 2017-07-28 | Lens focusing method, focusing mechanism and lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710631424.1A CN109307916B (en) | 2017-07-28 | 2017-07-28 | Lens focusing method, focusing mechanism and lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109307916A true CN109307916A (en) | 2019-02-05 |
| CN109307916B CN109307916B (en) | 2021-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710631424.1A Active CN109307916B (en) | 2017-07-28 | 2017-07-28 | Lens focusing method, focusing mechanism and lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113917648A (en) * | 2021-09-14 | 2022-01-11 | 中国科学院西安光学精密机械研究所 | Manual precision focusing and focusing mechanism capable of self-locking |
Citations (5)
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|---|---|---|---|---|
| US4636042A (en) * | 1983-01-26 | 1987-01-13 | Canon Kabushiki Kaisha | Mechanical mounting for zoom lens |
| US4865432A (en) * | 1986-02-26 | 1989-09-12 | Canon Kabushiki Kaisha | Lens mounting |
| CN101661152A (en) * | 2008-08-27 | 2010-03-03 | 鸿富锦精密工业（深圳）有限公司 | Focusing composition and projector provided with same |
| CN202153155U (en) * | 2011-05-06 | 2012-02-29 | 北京蔚蓝仕科技有限公司 | Rear focusing structure for optics infrared temp measurer |
| CN203950064U (en) * | 2014-07-04 | 2014-11-19 | 深圳银星精工科技发展有限公司 | A kind of focus adjusting mechanism of camera lens and camera lens |
-
2017
- 2017-07-28 CN CN201710631424.1A patent/CN109307916B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4636042A (en) * | 1983-01-26 | 1987-01-13 | Canon Kabushiki Kaisha | Mechanical mounting for zoom lens |
| US4865432A (en) * | 1986-02-26 | 1989-09-12 | Canon Kabushiki Kaisha | Lens mounting |
| CN101661152A (en) * | 2008-08-27 | 2010-03-03 | 鸿富锦精密工业（深圳）有限公司 | Focusing composition and projector provided with same |
| CN202153155U (en) * | 2011-05-06 | 2012-02-29 | 北京蔚蓝仕科技有限公司 | Rear focusing structure for optics infrared temp measurer |
| CN203950064U (en) * | 2014-07-04 | 2014-11-19 | 深圳银星精工科技发展有限公司 | A kind of focus adjusting mechanism of camera lens and camera lens |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113917648A (en) * | 2021-09-14 | 2022-01-11 | 中国科学院西安光学精密机械研究所 | Manual precision focusing and focusing mechanism capable of self-locking |
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| Publication number | Publication date |
|---|---|
| CN109307916B (en) | 2021-05-18 |
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