CN110879452A - Continuous focusing mechanism and corresponding lens - Google Patents
Continuous focusing mechanism and corresponding lens Download PDFInfo
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- CN110879452A CN110879452A CN201911240350.4A CN201911240350A CN110879452A CN 110879452 A CN110879452 A CN 110879452A CN 201911240350 A CN201911240350 A CN 201911240350A CN 110879452 A CN110879452 A CN 110879452A
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- focusing
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- lens frame
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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
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
The invention discloses a continuous focusing mechanism and a corresponding lens, wherein the focusing mechanism adopts a 360-degree continuous sinusoidal focusing wheel design, ensures that a motor-driven focusing wheel set can drive a lens to linearly reciprocate no matter the motor-driven focusing wheel set rotates forwards and backwards, and realizes potentiometer-free and limit-free continuous focusing; a plurality of adjusting screws are adopted to ensure that the axial lead of a lens structure carried by the objective lens frame coincides with the central line of an optical axis so as to obtain ideal imaging quality; and the polytetrafluoroethylene gasket is adopted to reduce the friction force and the pause feeling of the focusing wheel set in the rotating process. The focusing mechanism simplifies the structure of the lens, avoids the idle rotation damage of the motor, is simple and convenient to assemble, and has better overall reliability and stability.
Description
Technical Field
The invention relates to the technical field of photoelectricity and machinery, in particular to a continuous focusing mechanism and a corresponding lens.
Background
The focal length of the lens objective is easy to defocus under the influence of various factors such as environmental temperature change and the like. To solve this problem, the modern industry usually employs an electromechanical adjustment mechanism to adjust the position of one of the lenses to compensate for the defocus of the focal length. The existing lens focusing mechanism generally drives a cylindrical cam sleeve to rotate relative to a lens barrel through a motor, so that the axial linear motion of the lens barrel is driven, and the automatic focusing function of the lens is finally realized.
In the adjusting mechanism, the cylindrical cam sleeve is mostly designed in a way that a curved ring groove with a circumferential angle smaller than 360 degrees is formed on the cylindrical surface of the cylindrical cam sleeve, and the motor gear drives the cylindrical cam sleeve to rotate so as to drive the guide screw to move along the curved ring groove. Because the two ends of the curve ring groove are respectively the starting point and the end point of the ring groove, when the guide screw approaches the end point of the curve groove, the mechanical limit structure arranged on the cylindrical cam sleeve contacts the potentiometer in advance, and the potentiometer sends an electric signal to feed back to the motor to force the cylindrical cam sleeve to stop rotating. The existing lens focusing structure has obvious defects: and a potentiometer must be arranged, once the potentiometer fails, when the guide screw directly moves to the two ends of the curve ring groove, the lens stops moving linearly, the motor still keeps running, and power cannot be output, so that the motor is easily damaged. Similar lens focusing structures are disclosed in the published chinese patents CN109307916A, CN104238235A, CN201029007Y, CN108008518A and so on.
In a word, the reliability and stability of the existing lens focusing structure are insufficient, and the structure is complex and is not beneficial to the miniaturization design of products.
Disclosure of Invention
The invention aims to solve the problems of easy failure of a limiting mechanism, easy damage and short service life of a focusing motor, complex lens structure, high lens assembly difficulty and the like of the conventional lens focusing mechanism, and completely cancels a potentiometer through structural optimization design, so that the phenomena of jamming and incapability of outputting power cannot occur even if the motor continuously rotates in one direction.
The invention aims at providing a lens continuous focusing mechanism, which comprises a focusing lens frame 2, an objective lens frame 4, a guide screw 5 and a focusing wheel set 6; the focusing lens frame 2 is sleeved inside the objective lens frame 4, and the focusing wheel set 6 is sleeved outside the objective lens frame 4; the focusing wheel set 6 comprises a focusing gear 14 and a focusing ring 15 which are sleeved together, and a circular curve groove is formed in the surface of the focusing ring 15; one end of a guide screw 5 is fixed on the outer surface of the focusing lens frame 2, and the other end of the guide screw passes through a guide hole on the objective lens frame 4 and then extends into a circular curve groove of the focusing ring 15; the focusing motor 13 drives the focusing wheel set 6 to rotate through gear transmission, and the guide screw 5 moves in a circular curve groove of the focusing wheel set 6 to drive the focusing frame 2 to do linear reciprocating motion so as to realize a focusing function.
Further, the lens focusing mechanism further comprises an objective lens assembly 1 composed of at least two lenses, and at least one lens is fixed on the objective lens frame 4 and the focusing lens frame 2 respectively.
Furthermore, a plurality of threaded holes and matched adjusting screws 3 are arranged on the circumference of the objective lens frame 4, and after the lens is arranged at a preset position in the objective lens frame 4, each adjusting screw is rotated to enable the optical axis of the lens on the objective lens frame 4 to coincide with the optical axis of the optical system, so that the design requirement is met and better imaging quality is obtained. After the adjustment is completed, sealant is filled in the gap between the lens and the objective lens frame 4, and the adjusting screw 3 is removed.
Further, the number of the guide screws 5 is 2, and the two are aligned (equivalent to 180 ° of the two).
Further, a screw hole is provided in the surface of the focus lens frame 2, and the guide screw 5 is fixed to the focus lens frame 2 by a screw thread at the end portion.
Furthermore, a waist-shaped through hole is formed in the position, opposite to the circular curve groove, of the surface of the focusing gear 14, and therefore the guide screw is convenient to mount and dismount. The number of the through holes is the same as the number of the guide screws.
Further, the lens focusing mechanism further comprises a gasket 7 and a connecting flange 9, wherein the gasket 7 is sleeved on the objective lens frame 4 and locked by the connecting flange 9, and then the objective lens frame 4 and the connecting flange 9 are fixed through a fastening screw 8. The gasket 7 is made of polytetrafluoroethylene material with certain elasticity and low friction resistance.
Further, the lens focusing mechanism further comprises a motor fixing seat 11, the motor fixing seat 11 is fixedly connected with the objective lens frame 4 through a motor fixing screw 12, a motor gear 10 is fixed on a focusing motor 13, the focusing motor 13 is fixed on the motor fixing seat 11, and the motor gear 10 is meshed with a focusing gear 14, so that the focusing motor rotates to drive the motor gear 10 to rotate, and further the focusing assembly 6 is driven to rotate.
Further, the circular curve groove is a through 360-degree continuous sine curve ring groove.
Another object of the present invention is to provide a lens having the above-described focus adjustment mechanism mounted thereon.
Compared with the prior lens focusing mechanism of the same type, the invention has the following beneficial effects: (1) the traditional limiting mechanism is abandoned, a 360-degree continuous sine curve focusing wheel design is adopted, the motor-driven focusing wheel set can drive the lens to do linear reciprocating motion no matter the motor drives the focusing wheel set to rotate positively and negatively, continuous focusing without a potentiometer and limiting is realized, the lens structure is simplified, the motor is prevented from being damaged by idling, and the overall reliability and stability are greatly improved; (2) four threaded holes are uniformly distributed on the radial circumference of the front end of the objective lens frame, and the position of the first lens in the radial direction is adjusted through an adjusting screw, so that the structural axis line of the first lens is superposed with the optical axis center line, thereby achieving the design requirement and the ideal imaging quality, simplifying the optical correction and installation and debugging by the structure, and improving the assembly operability and stability of the lens; (3) compared with the traditional mode that a steel ball is arranged between an objective lens frame and the focusing wheel set to reduce friction, the invention not only can effectively reduce the caliber size of the whole lens structure, but also reduces the complexity of lens assembly and improves the tightness and reliability of the system.
Drawings
FIG. 1 is a schematic structural diagram of a continuous focusing mechanism for lens according to the present invention;
FIG. 2 is a side cross-sectional view of a focusing wheel assembly;
fig. 3 is an expanded view of the focusing wheel set a.
The focusing mechanism comprises a 1-objective lens assembly, a 2-focusing lens frame, a 3-adjusting screw, a 4-objective lens frame, a 5-guiding screw, a 6-focusing wheel set, a 7-gasket, an 8-fastening screw, a 9-connecting flange, a 10-motor gear, a 11-motor fixing seat, a 12-motor fixing screw, a 13-focusing motor, a 14-focusing gear, a 15-focusing ring and a 16-screw.
Detailed Description
In order to make those skilled in the art fully understand the technical solution of the present invention, the following embodiments are further described.
As shown in fig. 1, the continuous focusing mechanism for lens mainly includes an objective lens assembly 1, a focusing lens frame 2, an objective lens frame 4, a focusing wheel set 6, a connecting flange 9, a motor fixing base 11 and a focusing motor 13. The whole set of equipment uses objective picture frame 4 as the assembly main part, and 4 internal diameters of objective picture frame are located to 2 covers of focusing picture frame, and 4 external diameters of objective picture frame are located to 6 covers of focusing wheelset, and two lenses of objective picture assembly 1 are fixed respectively inside objective picture frame 4 and focusing picture frame 2 to use the clamping ring to fix it. In order to facilitate the installation of the lens on the objective lens frame and the optical center adjustment, four threaded holes and corresponding adjusting screws 3 are uniformly arranged on the circumference of the front end in the radial direction. A1-2 mm gap is formed between the inner diameter of the objective lens frame 4 and the outer diameter of the lens, the lens is arranged behind the objective lens frame 4, the adjusting screws 3 are arranged in the four threaded holes, and the position and the height of the lens in the radial direction are precisely finely adjusted through the adjusting screws 3, so that the optical axis line of the lens coincides with the optical axis line of an optical system, and the design requirement is met and the ideal imaging quality is obtained. And after the adjustment is finished, filling sealing glue solution into the gap for fixing the lens, and removing the adjusting screw 3 after the glue is dried.
2 threaded holes are formed in the outer circumferential surface of the focusing mirror frame 2 and used for connecting and fixing guide screws 5; two waist-shaped holes which are symmetrical with each other at 180 degrees are also arranged at the radial corresponding position of the cylindrical surface of the objective lens frame 4, so that the guide screw 5 can conveniently penetrate through the objective lens frame and enter the focusing wheel group 6. The focusing wheel set 6 comprises a focusing gear 14 and a focusing ring 15 which are sleeved and fixed together, wherein the focusing gear 14 is arranged in the outer focusing ring, and the two are fixed through a screw 16. A penetrating 360-degree continuous sinusoidal ring groove is formed in the outer cylindrical surface of the focusing ring 15, and the end of the guide screw can enter the continuous sinusoidal ring groove after being assembled and move along the sinusoidal ring groove. The outer circumference of the focusing gear 14 is provided with a gear and two waist-shaped holes which are symmetrical with each other at 180 degrees, the positions of the waist-shaped holes correspond to the positions of the guide screws, and the gear is meshed with and can be driven by the motor gear 10 of the focusing motor 13. The focusing motor 13 is fixed on the motor fixing seat 11, and then the whole is fixedly connected with the objective lens frame 4 through 2 motor fixing screws 12. The gasket 7 made of polytetrafluoroethylene is sleeved at the end part of the right side of the objective lens frame 4, and then the gasket is connected with the connecting flange 9 and fastened through the fastening screw 8, so that reliable connection and sealing are realized.
The working principle of the lens continuous focusing mechanism is as follows: the focusing motor 13 rotates (clockwise and anticlockwise) after being electrified, the focusing wheel set 6 is driven to rotate through the transmission of the motor gear 10 and the focusing gear 14, and the guide screw 5 is limited in a continuous sine curve ring groove of the focusing ring 15, so that the guide screw is driven to move along the continuous sine curve ring groove, and finally the focusing frame 2 and a lens on the focusing frame are driven to reciprocate back and forth along a straight line, so that the lens focusing function is realized. In this process, the focus lens frame 2 is a lens carrier that moves linearly with respect to the objective lens frame 4, and the focus process is a process in which the focus lens frame 2 moves linearly with respect to the objective lens frame 4.
Compared with the existing lens focusing device, the continuous focusing mechanism provided by the invention simplifies the lens structure, avoids the damage of motor clamping and idling, is convenient to assemble and correct, and improves the stability and reliability of the system.
Claims (10)
1. A continuous focusing mechanism for a lens is characterized by comprising a focusing lens frame (2), an objective lens frame (4), a guide screw (5) and a focusing wheel set (6); the focusing lens frame (2) is sleeved inside the objective lens frame (4), and the focusing wheel set (6) is sleeved outside the objective lens frame (4); the focusing wheel set (6) comprises a focusing gear (14) and a focusing ring (15) which are sleeved together, and a circular curve groove is formed in the surface of the focusing ring (15); one end of a guide screw (5) is fixed on the outer surface of the focusing lens frame (2), and the other end of the guide screw penetrates through a guide hole in the objective lens frame (4) and then extends into a circular curve groove of the focusing ring (15); the focusing motor (13) drives the focusing wheel set (6) to rotate, the guide screw (5) moves in a circular curve groove of the focusing wheel set (6) and drives the focusing frame (2) to do linear reciprocating motion to realize a focusing function.
2. A lens continuous focusing mechanism as claimed in claim 1, wherein: the continuous focusing mechanism of the lens further comprises an objective lens assembly (1) consisting of at least two lenses, and at least one lens is respectively fixed on the objective lens frame (4) and the focusing frame (2).
3. A lens continuous focusing mechanism as claimed in claim 2, wherein: the circumference of the objective lens frame (4) is provided with a plurality of threaded holes and matched adjusting screws (3), after the lens is installed at a preset position in the objective lens frame (4), each adjusting screw is rotated to enable the optical axis of the lens on the objective lens frame (4) to coincide with the optical axis of an optical system, and then sealant is filled in a gap between the lens and the objective lens frame (4) and the adjusting screws (3) are removed.
4. A lens continuous focusing mechanism as claimed in claim 1, wherein: the number of the guide screws (5) is 2, and the two are in the same straight line.
5. A lens continuous focusing mechanism as claimed in claim 1, wherein: the surface of the focusing lens frame (2) is provided with a threaded hole, and the guide screw (5) is fixed on the focusing lens frame (2) through the thread at the end part.
6. A lens continuous focusing mechanism as claimed in claim 1, wherein: through holes are arranged at the position, opposite to the circular curve groove, of the surface of the focusing gear (14), and the number of the through holes is the same as that of the guide screws.
7. A lens continuous focusing mechanism as claimed in claim 1, wherein: the lens focusing mechanism further comprises a gasket (7) and a connecting flange (9) which are made of polytetrafluoroethylene materials, the gasket (7) is sleeved on the objective lens frame (4) and locked by the connecting flange (9), and then the objective lens frame (4) and the connecting flange (9) are fixed through fastening screws (8).
8. A lens continuous focusing mechanism as claimed in claim 1, wherein: the lens focusing mechanism further comprises a motor fixing seat (11), the motor fixing seat (11) is fixedly connected with the objective lens frame (4) through a motor fixing screw (12), a motor gear (10) is fixed on a focusing motor (13), the focusing motor (13) is fixed on the motor fixing seat (11), the motor gear (10) is meshed with a focusing gear (14), the focusing motor rotates to drive the motor gear (10) to rotate, and a focusing assembly (6) is further driven to rotate.
9. A lens continuous focusing mechanism as claimed in claim 1, wherein: the circulating curve groove is a through 360-degree continuous sine curve ring groove.
10. An optical lens, characterized in that the optical lens is equipped with a continuous focusing mechanism as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911240350.4A CN110879452A (en) | 2019-12-06 | 2019-12-06 | Continuous focusing mechanism and corresponding lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911240350.4A CN110879452A (en) | 2019-12-06 | 2019-12-06 | Continuous focusing mechanism and corresponding lens |
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| Publication Number | Publication Date |
|---|---|
| CN110879452A true CN110879452A (en) | 2020-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911240350.4A Pending CN110879452A (en) | 2019-12-06 | 2019-12-06 | Continuous focusing mechanism and corresponding lens |
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| Country | Link |
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| CN (1) | CN110879452A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285935A (en) * | 2020-11-17 | 2021-01-29 | 京东方科技集团股份有限公司 | Display assembly, assembling method thereof and wearable display device |
| CN112719783A (en) * | 2020-12-03 | 2021-04-30 | 河北汉光重工有限责任公司 | Method for machining cylindrical cam with built-in curve groove |
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| CN204406019U (en) * | 2014-12-04 | 2015-06-17 | 深圳市威华立德电子有限公司 | A kind of focusing structure of projector ray machine |
| CN104849834A (en) * | 2015-06-03 | 2015-08-19 | 福建福光数码科技有限公司 | Medium-wave infrared continuous zooming camera shot and control method thereof |
| CN107656349A (en) * | 2017-11-06 | 2018-02-02 | 厦门力鼎光电技术有限公司 | A kind of camera lens of anti-vibration |
| JP2018025578A (en) * | 2016-08-08 | 2018-02-15 | キヤノン株式会社 | Lens device |
| CN207529001U (en) * | 2017-12-12 | 2018-06-22 | 上海帛视光电科技有限公司 | A kind of recognition of face imaging lens |
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2019
- 2019-12-06 CN CN201911240350.4A patent/CN110879452A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204406019U (en) * | 2014-12-04 | 2015-06-17 | 深圳市威华立德电子有限公司 | A kind of focusing structure of projector ray machine |
| CN104849834A (en) * | 2015-06-03 | 2015-08-19 | 福建福光数码科技有限公司 | Medium-wave infrared continuous zooming camera shot and control method thereof |
| JP2018025578A (en) * | 2016-08-08 | 2018-02-15 | キヤノン株式会社 | Lens device |
| CN107656349A (en) * | 2017-11-06 | 2018-02-02 | 厦门力鼎光电技术有限公司 | A kind of camera lens of anti-vibration |
| CN207529001U (en) * | 2017-12-12 | 2018-06-22 | 上海帛视光电科技有限公司 | A kind of recognition of face imaging lens |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285935A (en) * | 2020-11-17 | 2021-01-29 | 京东方科技集团股份有限公司 | Display assembly, assembling method thereof and wearable display device |
| CN112719783A (en) * | 2020-12-03 | 2021-04-30 | 河北汉光重工有限责任公司 | Method for machining cylindrical cam with built-in curve groove |
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| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200313 |