CN109298501A - A kind of lens focusing device and focus adjustment method - Google Patents
A kind of lens focusing device and focus adjustment method Download PDFInfo
- Publication number
- CN109298501A CN109298501A CN201811257467.9A CN201811257467A CN109298501A CN 109298501 A CN109298501 A CN 109298501A CN 201811257467 A CN201811257467 A CN 201811257467A CN 109298501 A CN109298501 A CN 109298501A
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- CN
- China
- Prior art keywords
- lens
- ultrasonic motor
- linear ultrasonic
- inner lens
- focusing device
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
-
- 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
Abstract
The invention discloses a kind of lens focusing device and focus adjustment methods.It is related to the technical field of focus adjustment, and proposes a kind of new focusing structure and focus adjustment method.The device is pre-processed by focal length value of the control circuit board (12) to input, voltage needed for making it be converted into control linear ultrasonic motor (03), it realizes that linear ultrasonic motor (03) drives removable inner lens cone (07) to move in a straight line, and then controls the position of lens group 1 (08) to change lens focus.And it is accurately adjusted again using the displacement information that displacement sensor (05) is fed back, and then realize the accurate focusing function of camera lens.The configuration of the present invention is simple, it is small in size, it focuses convenient, flexible, is suitable for the devices such as mobile phone camera, lesser endoscope.
Description
Technical field
The present invention relates to focus adjustment technical fields, and in particular to a kind of lens focusing device and focus adjustment method.
Background technique
Focusing is exactly the best articulation point that imaging is found by the distance between adjusting camera lens to image sensor, so that
Photo or video are more clear, better quality.
Present lens focusing is greatly focused with focusing motor, and focusing motor does not require nothing more than volume
It is small, and it is accurate to focus, and this is increased by its cost of manufacture.Focusing motor volume has the limit, so the body of focusing motor
Product limits the size of entire focusing structure.
Existing linear ultrasonic motor can all have a linear actuator driving lens group mobile, this Linear actuator
It uses so that the focus adjusting mechanism volume of camera lens can be bigger.To limit the volume of some products.
Summary of the invention
To solve the above-mentioned problems, invention proposes a kind of lens focusing device and focus adjustment method herein.
To achieve the goals above, the technical solution adopted in the present invention is as follows:
A kind of lens focusing device includes:
Outer lens barrel (01), elastic washer (02), linear ultrasonic motor (03), hard washer (04), displacement sensor (05),
Microsprings (06), removable inner lens cone (07), lens group 1 (08), inner lens cone (09), lens group 2 (10), optical sensor
(11) and control circuit board (12).
The lens group 1 (08) is connected with removable inner lens cone (07), and moves with its movement.Described is saturating
Microscope group 2 (10) is connected with inner lens cone (09), and immobilizes.
The removable inner lens cone (07) can make whole device volume directly as the rotor of linear ultrasonic motor (03)
It is smaller.
The microsprings (06) are connected to removable inner lens cone (07), and the displacement sensor (05) is according to spring
Compression and amount of tension judge the actual distance value of focus adjustment.
The elastic telescopic washer is fixed on linear ultrasonic motor (03) both ends, one side fixed straight line ultrasound electric machine
(03), on the other hand for linear ultrasonic motor, (03 running provides enough spaces.
The optical sensor (11) is connected in inner lens cone (09) end and with control circuit board (12), the control
Circuit board (12) processed is located at whole device end and connects together with outer lens barrel (01).
The control circuit board (12) includes central processing unit, image processing module, displacement voltage conversion module, displacement
Feedback module.
The image processing module is to carry out image procossing to the image on optical sensor (11), makes image at image quality
Amount is more preferable.
The displacement voltage conversion module is that the focussing distance value that external input is come in is converted into driving line ultrasonic
Voltage required for motor (03).It drives linear ultrasonic motor (03).
The Displacement Feedback module is the mobile actual distance value of the lens of sending displacement sensor (05) back and pre-
The distance value of adjusting compares and analyzes, and the difference of transmission range is to central processing unit.
The linear ultrasonic motor (03) includes: piezoelectric element (13), scope bore (14), metal cuboid (15).
Metal cuboid (15) material is phosphor bronze, againsts the stator that piezoelectric element (13) constitute motor on four sides.Piezoelectricity member
Part is stiffened piezoelectric material, their polarization direction is thickness direction, and outside is anode, and inner face is cathode.Outer surface has two
A silver electrode, and have insulator isolation between two electrodes.Inner lens cone (09) hole is slightly larger than removable inner lens cone (07).Piezoelectricity
(13) two silver electrodes of element meet E respectivelya, Eb, metal cuboid (15) ground connection.
EaCalculation formula it is as follows:
Ea=AE sin(2πfEt)
EbCalculation formula it is as follows:
Eb=AE sin(2πfEt+φ)
Wherein AEAnd fEIt is to apply alive amplitude and frequency respectively, φ is EaAnd EbBetween phase difference, t is the time.
Piezoelectric element (13) can generate both of which under different voltage effects, and one kind being referred to as first and expands mode,
Another kind expands mode for second.Work as Ea=EbWhen, piezoelectric element (13) can generate the first expansion mode i.e. it is duplicate contraction and it is swollen
It is swollen.Work as Ea=-EbWhen, piezoelectric element (13) can generate second of expansion mode and shrink left side expansion right side.Mould is expanded first
Provide for 1/4 time difference among formula and the second expansion mode, the surface of such scope bore (14) can generate the fortune of elliptical orbit
Dynamic, this movement is transmitted to removable inner lens cone (07) by frictional force, driving move inner lens cone (07) move in a straight line thus
To change the focal length of camera lens.
The focus adjustment method of the lens focusing device characterized by comprising
(1) central processing unit described in is used to receive the signal of focussing distance, and gives signal to displacement voltage conversion module.
(2) the then displacement voltage conversion module, carries out the conversion of displacement voltage, and required voltage is sent to straight line
Ultrasound electric machine (03) controls the movement of lens group 1 (08).
(3) displacement sensor (05) sends back the mobile actual distance value of adjustable lens, and passes through Displacement Feedback module analysis pair
Than seeing adjustable lens group will also move how many distance.Distance value is sent to central processing unit again.
(4) (1) is repeated, (2), (3) step arrives required position until adjusting.
A kind of described lens focusing device and focus adjustment method, which is characterized in that the central processing unit, displacement voltage
Conversion module, linear ultrasonic motor (03) and displacement sensor (05) form a closed-loop control system, it is ensured that preferably imaging
Effect and more accurately focusing.
Detailed description of the invention
Fig. 1 is the structure chart (side, sectional) of a kind of lens focusing device and focus adjustment method proposed by the present invention.
Fig. 2 is linear ultrasonic motor (03) structure chart.
Fig. 3 is the schematic diagram that linear ultrasonic motor (03) connects voltage.
Fig. 4 is the first expansion mode of piezoelectric element (13).
Fig. 5 is the second expansion mode of piezoelectric element (13).
Fig. 6 is the block diagram of control circuit board (12).
Fig. 7 is the flow chart focused.
Drawing reference numeral explanation:
01 outer lens barrel, 02 elastic washer, 03 linear ultrasonic motor, 04 hard washer, 05 displacement sensor, 06 miniature bullet
Spring, 07 removable inner lens cone, 08 lens group 1,09 inner lens cone, 10 lens groups 2,11 optical sensors, 12 control circuit boards, 13 pressures
Electric device, 14 scope bore, 15 metal cuboids.
Specific embodiment
Detailed process to illustrate the invention, is described in detail below with reference to attached drawing.
With reference to Fig. 1, a kind of lens focusing device and focus adjustment method.Lens focusing device in the present invention includes: 01 epi mirror
Cylinder, 02 elastic washer, 03 linear ultrasonic motor, 04 hard washer, 05 displacement sensor, 06 microsprings, 07 removable scope
Cylinder, 08 lens group 1,09 inner lens cone, 10 lens groups 2,11 optical sensors, 12 control circuit boards.
The lens group 1 (08) is connected with removable inner lens cone (07), and moves with its movement.Described is saturating
Microscope group 2 (10) is connected with inner lens cone (09), and immobilizes.
The removable inner lens cone (07) can make whole device volume directly as the rotor of linear ultrasonic motor (03)
It is smaller.
The microsprings (06) are connected to removable inner lens cone (07), and the displacement sensor (05) is according to spring
Compression and amount of tension judge the actual distance value of focus adjustment.
The elastic telescopic washer is fixed on linear ultrasonic motor (03) both ends, one side fixed straight line ultrasound electric machine
(03), enough spaces on the other hand are provided for the running of ultrasound electric machine.
The optical sensor (11) is connected in inner lens cone (09) end and with control circuit board (12), the control
Circuit board (12) processed is located at whole device end and connects together with outer lens barrel (01).
It is the linear ultrasonic motor (03), comprising: 13 piezoelectric elements, 14 scope bore, 15 metals are long with reference to Fig. 2
Cube.
Metal cuboid (15) material is phosphor bronze, and phosphor bronze has a feature of metal, but tool have good wearability and
Elasticity.Four sides againsts the stator that piezoelectric element (13) constitute motor.Piezoelectric element is stiffened piezoelectric material, their polarization direction
For thickness direction, outside is anode, and inner face is cathode.There are two silver electrodes for outer surface tool, and have insulation between two electrodes
Body isolation.Inner lens cone (09) hole is slightly larger than removable inner lens cone (07).
With reference to Fig. 3, piezoelectric element (13) one end all meets Ea, piezoelectric element (13) other end all meets Eb, metal cuboid (15)
Ground connection.Linear ultrasonic motor (03) principle is as follows:
EaCalculation formula it is as follows:
Ea=AE sin(2πfEt)
EbCalculation formula it is as follows:
Eb=AE sin(2πfEt+φ)
Wherein AEAnd fEIt is to apply alive amplitude and frequency respectively, φ is EaAnd EbBetween phase difference, t is the time.
Piezoelectric element (13) can generate both of which under different voltage effects, and one kind being referred to as first and expands mode
(referring to Fig. 4), another kind expand mode (referring to Fig. 5) for second.Work as Ea=EbWhen, piezoelectric element (13) can generate the first expansion
Mode, that is, duplicate contraction and expansion.Work as Ea=-EbWhen, piezoelectric element (13) can generate second of expansion mode and shrink left side
Expansion right side.1/4 time difference, the table of such scope bore (14) are provided among the first expansion mode and the second expansion mode
Face can generate the movement of elliptical orbit, and this movement is transmitted to removable inner lens cone (07) by frictional force, drive removable scope
Cylinder (07) moves in a straight line to come the focal length that changes camera lens.
It is the control circuit board (12), including central processing unit, image processing module, displacement piezoelectric turn with reference to Fig. 6
Change module, Displacement Feedback module.The image processing module, displacement piezoelectric conversion module, Displacement Feedback module and centre
It manages device and uses two-way communication, form a small closed-loop control.
The central processing unit is used to receive the signal of focussing distance, and gives signal to displacement voltage conversion module.
The image processing module is to carry out image procossing to the image on optical sensor (11), makes image at image quality
Amount is more preferable.
The displacement voltage conversion module is that the focussing distance value that external input is come in is converted into driving line ultrasonic
Voltage required for motor (03).It drives linear ultrasonic motor (03).
The Displacement Feedback module is the mobile actual distance value of the lens of sending displacement sensor (05) back and pre-
The distance value of adjusting compares and analyzes, and the difference of transmission range is to central processing unit.
The focus adjustment method of the lens focusing device, referring to Fig. 7, detailed process is as follows:
(1) central processing unit described in is used to receive the signal of focussing distance, and gives signal to displacement voltage conversion module.
(2) the then displacement voltage conversion module, carries out the conversion of displacement voltage, and required voltage is sent to straight line
Ultrasound electric machine (03), the movement of control lens group 1 (08) group.
(3) displacement sensor (05) sends back the mobile actual distance value of adjustable lens, and passes through Displacement Feedback module analysis pair
Than seeing adjustable lens group will also move how many distance.Distance value is sent to central processing unit again.
(4) (1) is repeated, (2), (3) step arrives required position until adjusting.
Described central processing unit, displacement voltage conversion module, linear ultrasonic motor (03) and displacement sensor (05) shape
At a closed-loop control system, it is ensured that better imaging effect and more accurately focusing.
The above is only preferable a kind of embodiment of the invention, but protection scope of the present invention is not limited to this, is appointed
What those familiar with the art can also make more preferable adjustment and change without departing from the principle of the present invention
Into these adjustment and improvement should be all included within the scope of the present invention.
Claims (8)
1. a kind of lens focusing device, includes:
It is outer lens barrel (01), elastic washer (02), linear ultrasonic motor (03), hard washer (04), displacement sensor (05), miniature
Spring (06), removable inner lens cone (07), lens group 1 (08), inner lens cone (09), lens group 2 (10), optical sensor (11),
And control circuit board (12).
2. a kind of lens focusing device according to claim 1, which is characterized in that the lens group 1 (08) with it is removable
Dynamic inner lens cone (07) is connected, and moves as removable inner lens cone (07) is mobile.The lens group 2 (10) and inner lens cone
(09) it is connected, and immobilizes.
3. a kind of lens focusing device according to claim 1, which is characterized in that the removable inner lens cone (07) is straight
The rotor as linear ultrasonic motor (03) is connect, whole device volume can be made smaller.
4. a kind of lens focusing device according to claim 1, which is characterized in that the microsprings (06) are connected to
Removable inner lens cone (07), compression and amount of tension of the displacement sensor (05) according to spring judge the reality of focus adjustment
Border distance value.
5. a kind of lens focusing device according to claim 1, which is characterized in that the elastic telescopic washer is fixed on
Linear ultrasonic motor (03) both ends, one side fixed straight line ultrasound electric machine (03) are on the other hand linear ultrasonic motor (03)
Running provides enough spaces.
6. a kind of lens focusing device according to claim 1, which is characterized in that the control circuit board (12) includes
Central processing unit, image processing module, displacement voltage conversion module, Displacement Feedback module.
The image processing module is to carry out image procossing to the image on optical sensor (11), makes image image quality more
It is good.
The displacement voltage conversion module is that the focussing distance value that external input is come in is converted into driving linear ultrasonic motor
(03) voltage required for.It drives linear ultrasonic motor (03).
The Displacement Feedback module be the mobile actual distance value of the lens of passing displacement sensor (05) back with it is pre-adjusted
Distance value compares and analyzes, and the difference of transmission range is to central processing unit.
7. a kind of lens focusing device according to claim 1, which is characterized in that linear ultrasonic motor (03) packet
Contain: piezoelectric element (13), scope bore (14), metal cuboid (15).
Metal cuboid (15) material is phosphor bronze, againsts the stator that piezoelectric element (13) constitute motor on four sides.Piezoelectric element is
Stiffened piezoelectric material, their polarization direction are thickness direction, and outside is anode, and inner face is cathode.There are two silver for outer surface tool
Electrode, and have insulator isolation between two electrodes.Inner lens cone (09) hole is slightly larger than removable inner lens cone (07).Piezoelectric element
(13) two silver electrodes meet E respectivelya, Eb, metal cuboid (15) ground connection.
EaCalculation formula it is as follows:
Ea=AEsin(2πfEt)
EbCalculation formula it is as follows:
Eb=AEsin(2πfEt+φ)
Wherein AEAnd fEIt is to apply alive amplitude and frequency respectively, φ is EaAnd EbBetween phase difference, t is the time.
Piezoelectric element (13) can generate both of which under different voltage effects, and one kind being referred to as first and expands mode, another
Kind expands mode for second.Work as Ea=EbWhen, piezoelectric element (13) can generate the i.e. duplicate contraction of the first expansion mode and expansion.
Work as Ea=-EbWhen, piezoelectric element (13) can generate second of expansion mode and shrink left side expansion right side.Mode is expanded first
The movement of elliptical orbit can be generated with the surface of the time difference for providing 1/4 among the second expansion mode, such scope bore (14),
This movement is transmitted to removable inner lens cone (07) by frictional force, drives removable inner lens cone (07) to move in a straight line thus to change
Become the focal length of camera lens.
8. according to claim 1 to a kind of lens focusing device and focus adjustment method described in 7, which is characterized in that the center
Processor, displacement voltage conversion module, linear ultrasonic motor (03) and displacement sensor (05) form a closed-loop control system,
Ensure better imaging effect and more accurately focusing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811257467.9A CN109298501B (en) | 2018-10-26 | 2018-10-26 | Lens focusing device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811257467.9A CN109298501B (en) | 2018-10-26 | 2018-10-26 | Lens focusing device and method |
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| CN109298501A true CN109298501A (en) | 2019-02-01 |
| CN109298501B CN109298501B (en) | 2020-12-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111103698A (en) * | 2019-12-31 | 2020-05-05 | 中国船舶重工集团公司第七一七研究所 | Cassegrain is target surface position micromatic setting for camera lens |
| CN112217991A (en) * | 2020-09-28 | 2021-01-12 | 北京环境特性研究所 | Image acquisition device, focus adjusting device and focus adjusting method |
| WO2022033356A1 (en) * | 2020-08-12 | 2022-02-17 | 华为技术有限公司 | Ultrasonic piezoelectric motor, camera module, and electronic device |
| CN114280778A (en) * | 2021-11-24 | 2022-04-05 | 歌尔光学科技有限公司 | Intelligent glasses and image distance adjusting method thereof |
| CN116454718A (en) * | 2023-06-13 | 2023-07-18 | 深圳市镭硕光电科技有限公司 | Laser device |
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| CN111103698A (en) * | 2019-12-31 | 2020-05-05 | 中国船舶重工集团公司第七一七研究所 | Cassegrain is target surface position micromatic setting for camera lens |
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| CN114280778A (en) * | 2021-11-24 | 2022-04-05 | 歌尔光学科技有限公司 | Intelligent glasses and image distance adjusting method thereof |
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| CN116454718B (en) * | 2023-06-13 | 2023-08-11 | 深圳市镭硕光电科技有限公司 | Laser device |
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