CN201107450Y - Camera lens drive apparatus - Google Patents
Camera lens drive apparatus Download PDFInfo
- Publication number
- CN201107450Y CN201107450Y CNU2007201727254U CN200720172725U CN201107450Y CN 201107450 Y CN201107450 Y CN 201107450Y CN U2007201727254 U CNU2007201727254 U CN U2007201727254U CN 200720172725 U CN200720172725 U CN 200720172725U CN 201107450 Y CN201107450 Y CN 201107450Y
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- assembly
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- piezo
- electric motor
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- 230000033001 locomotion Effects 0.000 description 11
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- 238000005516 engineering process Methods 0.000 description 2
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- 230000001737 promoting effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
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- Lens Barrels (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The utility model provides a lens-driving device, which comprises a piezoelectric motor component and a driven component, wherein, the piezoelectric motor component consists of a piezoelectric motor, a motor base and a friction coupling head, one end of the piezoelectric motor is fixed on the motor base, the other end is bonded with the friction coupling head, which presses the driven component, one side of a base is connected with one side of the driven component, the piezoelectric motor component and the driven component are placed on the base, and a pretightening component is sandwiched between the motor base and the base. When the piezoelectric motor is driven, the driven component can move relative to the base, because the action point of driving force is on the end of the friction coupling head and the distance from the piezoelectric motor is maintained, the travel and mass of a lens mount in the driven component do not affect the capability of the lens mount to repond to the vibration of the piezoelectric motor, and the bonded area between the friction coupling head and the piezoelectric motor is larger than the size of the friction coupling head, thus ensuring firm bonding between the friction coupling head and the piezoelectric motor.
Description
Technical field
The utility model relates to the camera technique field, relates in particular to a kind of drive unit of camera lens.
Background technology
Along with popularizing and the variation of function of mobile phone, the mobile phone with automatic focusing camera will have more and more broader market outlook.Automatic focusing mobile phone on the market is normally used now is electromagnetic induction machines, it has big, the power advantages of higher of moment, but not enough be that bearing accuracy is not high, can not fast self-locking, be difficult to microminiaturization or the like, be unsuitable for the fashion trend that present mobile phone cam is done littler and littler.
Piezo-electric motor has the bearing accuracy height, and low speed high torque is simple in structure, and advantages such as no electromagnetic interference (EMI) are just beginning to be widely used in the mobile phone cam module of focusing automatically at present.And two kinds of wherein main type of drive drive and inertia-activated for resonance.The advantage that resonance drives is that speed is fast, efficient height, but a series of problems such as that shortcoming is is overheated, noise, dust.The ultrasound wave of the inertia-activated mobile phone cam of focusing automatically can effectively be avoided the problems referred to above.
Focus the automatically product of module of the mobile phone cam that adopts inertia-activated to produce in the market, its structure as shown in Figures 1 and 2, this lens driving apparatus 1 comprises motor base 11, piezo-electric motor 12, driving stem 13 and lens bracket 14.Motor base 11 surfaces are bonding with the bottom of piezo-electric motor 12, the bottom of driving stem 13 is bonded in the top of piezo-electric motor 12, lens bracket 14 is as driven member, it comprises the sleeve 141 that assembles camera lens and by the elastic force folder 142 that is connected in sleeve 141 1 sides, and elastic force folder 142 and driving stem 13 are fixed together by friction force.Motor base 11 is piezo-electric motor 12 bottoms and support whole motion fixedly, piezo-electric motor 12 is converted into kinetic energy with electric energy, for entire mechanism provides power, when piezo-electric motor 12 work, driving stem 13 can the in the vertical direction vibration down along with the vibration of piezo-electric motor 12.
When acting on the piezo-electric motor 12 without any signal, driving stem 13 is in free state, when the drive signal voltage on acting on piezo-electric motor 12 slowly rises, driving stem 13 stretches slowly along with piezo-electric motor 12 and moves forward, and the stiction that acts on 14 of driving stem 13 and lens brackets is promoting lens bracket 14 motions; In drive signal voltage decline stage suddenly, piezo-electric motor 12 shrinks suddenly and makes driving stem 13 get back to initial position rapidly, though the movement velocity of lens bracket 14 can reduce because of the effect of the force of sliding friction of 14 of driving stem 13 and lens brackets, but lens bracket 14 also can continue along original direction of motion to move under the effect of inertial force, thereby realizes the drive controlling of 12 pairs of lens brackets 14 of motor.
Though this scheme is simple in structure, assembling easily, it also has the following disadvantages: 1, in order to guarantee stroke, driving stem 13 needs certain length, but lens bracket 14 is far away more with the distance of piezo-electric motor 12, and it is poor more to the responding ability of piezo-electric motor 12 vibrations; 2, this structure is subjected to the influence of lens bracket 14 quality easily, and lens bracket 14 quality are big more, and it is also poor more to the responding ability of piezo-electric motor 12 vibrations; 3, bondingly between driving stem 13 and the piezo-electric motor 12 be subjected to that bar is long, the influence of the quality of the cross-sectional area of bar and bar, the size of the relative driving stem 13 of bond area between driving stem 13 and the piezo-electric motor 12 is less, driving stem 13 comes off from piezo-electric motor 12 easily.
The utility model content
The technical problems to be solved in the utility model is, a kind of lens driving apparatus is provided, no matter the stroke length of lens bracket or the size of quality can both make lens bracket keep responding ability to the piezo-electric motor vibration, and the good bonding of can guarantee to rub coupling head and piezo-electric motor.
In order to solve the problems of the technologies described above, the utility model provides a kind of lens driving apparatus, comprises the piezo-electric motor assembly and is driven assembly.The piezo-electric motor assembly comprises piezo-electric motor, motor seat and friction coupling head, and an end of piezo-electric motor is fixed on the motor seat, and the other end is bonding with the friction coupling head, and the friction coupling head is pressed on and is driven on the assembly.Lens driving apparatus also comprises base and pretension assembly, piezo-electric motor assembly and be driven assembly and be placed on the base, and the pretension assembly is folded between motor seat and the base.
When piezo-electric motor is driven, utilize the pretightning force of pretension assembly, the friction coupling head is pressed on and is driven on the assembly, and friction coupling head and the friction force that is driven between the assembly are the driving force that is driven assembly, and being driven assembly can move relative to base.Be driven in the assembly motion process, because the application point of driving force is in the end of friction coupling head, it remains unchanged apart from the distance of piezo-electric motor, therefore can guarantee that the stroke and the quality that are driven the lens bracket in the assembly can not influence the responding ability of lens bracket to the piezo-electric motor vibration, and can make the friction coupling head bigger, guarantee the good bonding of friction coupling head and piezo-electric motor with the size of the relative coupling head that rubs of bond area of piezo-electric motor.
Description of drawings
Fig. 1 is the lens driving apparatus structural representation that prior art provides;
Fig. 2 is the lens driving apparatus STRUCTURE DECOMPOSITION synoptic diagram that prior art provides;
Fig. 3 is the lens driving apparatus structural representation that the utility model embodiment provides;
Fig. 4 is the lens driving apparatus STRUCTURE DECOMPOSITION synoptic diagram that the utility model embodiment provides;
Fig. 5 is that the position of spheroid and V-shaped groove concerns synoptic diagram among the utility model embodiment;
Fig. 6 is the decomposing schematic representation of the axis of guide and base among the utility model embodiment;
Fig. 7 is the structural representation of distance measuring equipment among the utility model embodiment;
Fig. 8 is the cross-sectional schematic of the utility model embodiment along A-A line among Fig. 7.
Embodiment
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
As shown in Figure 3 and Figure 4, the utility model embodiment lens driving apparatus 2 comprises piezo-electric motor assembly 22 and is driven assembly 23.Piezo-electric motor assembly 22 comprises piezo-electric motor 222, motor seat 221 and friction coupling head 223, and an end of piezo-electric motor 222 is fixed on the motor seat 221, and the other end is bonding with friction coupling head 223, and friction coupling head 223 is pressed on and is driven on the assembly 23.Lens driving apparatus 2 also comprises base 21 and pretension assembly 24.One side of base 21 is connected with a side that is driven assembly 23, piezo-electric motor assembly 22 and be driven assembly 23 and be placed on the base 21, and pretension assembly 24 is folded between motor seat 221 and the base 21.
Be driven assembly 23 and comprise lens bracket 231 and friction member 232, lens bracket 231 is fixedlyed connected with friction member 232, and lens bracket 231 is connected with base 21, and friction member 232 is pressed on the friction coupling head 223, and friction member 232 can be friction ceramics or other wear parts.Pretension assembly 24 can be a spring, or other can make the device that produces pretightning force between motor seat 221 and the base 21.
When acting on the piezo-electric motor 222 without any drive signal, piezo-electric motor 222 is in free state.When the drive signal voltage on acting on piezo-electric motor 222 slowly rises, friction coupling head 223 stretches slowly along with piezo-electric motor 222 and moves, the pretightning force that pretension assembly 24 produces is pressed on friction coupling head 223 to be driven on the assembly 23 and produces stiction, therefore, friction coupling head 223 and be driven stiction between the assembly 23 and promoting to be driven assembly 23 and move.When drive signal voltage descends suddenly, friction coupling head 223 has been got back to its initial position rapidly along with shrinking suddenly of piezo-electric motor 222, can be driven the state that assembly 23 will move along original direction maintenance under the effect of inertial force because the effect that rubs coupling head 223 and be driven the force of sliding friction of 23 of assemblies reduces although be driven the movement velocity of assembly 23.Like this, under the effect of a driving pulse, be driven assembly 23 on the microcosmic and moved a bit of distance, under the effect of driving pulse sequence, can realize being driven assembly 23 continuous one-way movements.By changing the form of drive signal, convert the drive signal that descends suddenly that slowly rises to rise and slowly descend suddenly drive signal, can realize being driven the opposite direction continuous motion of assembly 23.
When piezo-electric motor 222 is driven, being driven assembly 23 moves relative to base 21, be driven assembly 23 in motion process, because friction coupling head 223 and the application point that is driven the friction force between the assembly 23 are in the end that rubs coupling head 223, application point remains unchanged apart from the distance of piezo-electric motor 222, therefore can guarantee to be driven the stroke of the lens bracket 231 in the assembly 23 and the responding ability that quality can not influence 222 vibrations of 231 pairs of piezo-electric motors of lens bracket, and can make friction coupling head 223 bigger, guarantee the good bonding of friction coupling head 223 and piezo-electric motor 222 with the size of the relative coupling head 223 that rubs of bond area of piezo-electric motor 222.
Among the utility model embodiment, lens driving apparatus 2 also comprises upper end cover 29, upper end cover 29 is pressed on base 21 and the piezo-electric motor assembly 22, fluted on the base 21, piezo-electric motor assembly 22 is positioned at groove, under the pressure effect of upper end cover 29, it does not have degree of freedom at optical axis direction, and maintenance contacts with the tight of base 21.
As shown in Figure 4, motor seat in the piezo-electric motor assembly 23 221 is fluted 224, and friction coupling head 223 leaves the gap between the top of friction coupling head 223 and the motor seat 221 in piezo-electric motor 222 is embedded in the groove 224 of motor seat 221.Like this, an end of piezo-electric motor 222 is fixed, and the other end is in free state with friction coupling head 223, has guaranteed that piezo-electric motor 222, can free vibration under the drive signal effect.
In conjunction with Fig. 4 and Fig. 5, among the utility model embodiment, being driven assembly 23 can be to be connected by spheroid 261 with connected mode between the base 21, and base 21 or the side that is driven at least one assembly in the assembly 23 are provided with groove.Can be useful on the groove 263 that embeds spheroid 261 on one of them assembly, the groove 262 as spheroid 261 guide rails can be arranged on another assembly.Base 21 and the pressure that is driven between the assembly 23 are limited in spheroid 261 in groove 263 and the groove 262, spheroid 261 is merely able to roll relatively in the groove length allowed band, friction between them is rolling friction, thereby makes the quality that is driven assembly 23 be reduced to minimum to the adverse effect that piezo-electric motor 222 vibrates.
Among the utility model embodiment; base 21 and being driven between the assembly 23, as long as spheroid 261 is arranged, or spheroid 261 and groove 263; the no matter flute profile and the length of the quantity of spheroid 261 and groove 263 and arrangement, groove are all within protection domain of the present utility model.
In conjunction with Fig. 4 and Fig. 6, on the base 21 of the utility model embodiment lens driving apparatus 2 pilot hole 253 is arranged, pilot hole 291 is arranged on the end cap 29, be driven gathering sill 251 is arranged on the assembly 23, be inserted with an axis of guide 252 in gathering sill 251, the two ends of this axis of guide 252 plug respectively and are fixed in the pilot hole 253,291, the dead in line of the axis of guide 252 and gathering sill 251, thereby restriction is driven assembly 23 rocking when motion, makes to be driven the movement locus that assembly 23 can keep straight line along optical axis.
In conjunction with Fig. 4, Fig. 7 and Fig. 8, the utility model embodiment lens driving apparatus 2 also comprises reflex reflector lens 271 and position transducer 272, and reflex reflector lens 271 sticks on and is driven on the assembly 23, can follow to be driven assembly 23 and to move.Position transducer 272 is fixed on the base 21, it comprises emitter and receiving trap, the infrared light that emitter sends is through after the reflection of reflex reflector lens 271, being received device receives, the light signal that receiving trap receives can change along with the variation of reflective distance, can accurately obtain being driven the displacement of assembly 23 in this way.
As shown in Figure 4, the utility model embodiment lens driving apparatus 2 also comprises pcb board 28, and pcb board 28 is connected with piezo-electric motor 222, position transducer 272 etc., realize to transmit electric energy, control signal, accepts function such as feedback information.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1, a kind of lens driving apparatus, comprise the piezo-electric motor assembly and be driven assembly, the piezo-electric motor assembly comprises piezo-electric motor, motor seat and friction coupling head, one end of piezo-electric motor is fixed on the motor seat, the other end is bonding with the friction coupling head, it is characterized in that: an end of described friction coupling head is pressed on and is driven on the assembly, described lens driving apparatus also comprises base and pretension assembly, described piezo-electric motor assembly and be driven assembly and be placed on the base, the pretension assembly is folded between described motor seat and the base.
2, lens driving apparatus as claimed in claim 1 is characterized in that: be connected by spheroid between the side of the described side that is driven assembly and base.
3, lens driving apparatus as claimed in claim 2 is characterized in that: described base is provided with groove with the side that is driven at least one assembly in the assembly, and described spheroid is positioned at groove.
4, lens driving apparatus as claimed in claim 3 is characterized in that: described base is useful on the groove that embeds spheroid with being driven on the assembly in the assembly, the groove as the spheroid guide rail is arranged on another assembly.
5, lens driving apparatus as claimed in claim 1 is characterized in that: the described assembly that is driven comprises lens bracket and friction member, and lens bracket is fixedlyed connected with friction member, and described friction coupling head is pressed on the friction member.
6, lens driving apparatus as claimed in claim 1 is characterized in that: described lens driving apparatus also comprises upper end cover, and upper end cover is pressed on described base and the piezo-electric motor assembly.
7, lens driving apparatus as claimed in claim 6, it is characterized in that: on described base and the upper end cover pilot hole is arranged, described being driven has gathering sill in the assembly, the axis of guide is arranged in the gathering sill, and axis of guide two ends are separately fixed in the pilot hole on base and the upper end cover.
8, lens driving apparatus as claimed in claim 1 is characterized in that: described motor seat is provided with groove, and described friction coupling head leaves the gap between the top of described friction coupling head and the motor seat in piezo-electric motor is embedded in the groove of described motor seat.
9, lens driving apparatus as claimed in claim 1 is characterized in that: described pretension assembly is a spring.
10, lens driving apparatus as claimed in claim 1 is characterized in that: described being driven is pasted with reflecting piece on the assembly, be fixed with position transducer on the described base, and position transducer comprises emitter and receiving trap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201727254U CN201107450Y (en) | 2007-10-26 | 2007-10-26 | Camera lens drive apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201727254U CN201107450Y (en) | 2007-10-26 | 2007-10-26 | Camera lens drive apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201107450Y true CN201107450Y (en) | 2008-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201727254U Expired - Lifetime CN201107450Y (en) | 2007-10-26 | 2007-10-26 | Camera lens drive apparatus |
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| Country | Link |
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| CN (1) | CN201107450Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728970A (en) * | 2008-10-10 | 2010-06-09 | 德昌电机(深圳)有限公司 | Piezoelectric type moving system and lens driving device with same |
| CN101728971A (en) * | 2008-10-17 | 2010-06-09 | 德昌电机(深圳)有限公司 | Piezoelectric type moving system and lens driving device with same |
| US8292248B2 (en) | 2008-09-01 | 2012-10-23 | Johnson Electric S.A. | Rotatable platform |
| CN105607211A (en) * | 2015-12-31 | 2016-05-25 | 中国华录集团有限公司 | Lens adjustment structure and projection optical system |
| CN105988180A (en) * | 2015-02-13 | 2016-10-05 | 信泰光学(深圳)有限公司 | Optical device capable of quick focusing |
| CN111770214A (en) * | 2019-04-01 | 2020-10-13 | 北京小米移动软件有限公司 | Camera telescopic machanism and mobile terminal |
-
2007
- 2007-10-26 CN CNU2007201727254U patent/CN201107450Y/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8292248B2 (en) | 2008-09-01 | 2012-10-23 | Johnson Electric S.A. | Rotatable platform |
| CN101666898B (en) * | 2008-09-01 | 2013-04-03 | 德昌电机(深圳)有限公司 | Multi-directional rotating platform |
| CN101728970A (en) * | 2008-10-10 | 2010-06-09 | 德昌电机(深圳)有限公司 | Piezoelectric type moving system and lens driving device with same |
| CN101728970B (en) * | 2008-10-10 | 2013-12-11 | 德昌电机(深圳)有限公司 | Piezoelectric type moving system and lens driving device with same |
| CN101728971A (en) * | 2008-10-17 | 2010-06-09 | 德昌电机(深圳)有限公司 | Piezoelectric type moving system and lens driving device with same |
| CN101728971B (en) * | 2008-10-17 | 2013-10-30 | 德昌电机(深圳)有限公司 | Piezoelectric type moving system and lens driving device with same |
| CN105988180A (en) * | 2015-02-13 | 2016-10-05 | 信泰光学(深圳)有限公司 | Optical device capable of quick focusing |
| CN105607211A (en) * | 2015-12-31 | 2016-05-25 | 中国华录集团有限公司 | Lens adjustment structure and projection optical system |
| CN105607211B (en) * | 2015-12-31 | 2018-06-19 | 中国华录集团有限公司 | Lens adjustment structure and projection optical system |
| CN111770214A (en) * | 2019-04-01 | 2020-10-13 | 北京小米移动软件有限公司 | Camera telescopic machanism and mobile terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Guangdong Dechang Motor Co.,Ltd. Assignor: Johnson Electric (Shenzhen) Co., Ltd. Contract fulfillment period: 2009.9.8 to 2014.9.7 Contract record no.: 2009440001443 Denomination of utility model: Two-section lens driver Granted publication date: 20080827 License type: Exclusive license Record date: 20090918 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.9.8 TO 2014.9.7; CHANGE OF CONTRACT Name of requester: GUANGDONG DECHANG ELECTRIC MACHINE CO., LTD. Effective date: 20090918 |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080827 |