CN207926475U - A kind of closed-loop feedback arrangement of voice coil motor, voice coil motor and camera module - Google Patents
A kind of closed-loop feedback arrangement of voice coil motor, voice coil motor and camera module Download PDFInfo
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- CN207926475U CN207926475U CN201820312213.1U CN201820312213U CN207926475U CN 207926475 U CN207926475 U CN 207926475U CN 201820312213 U CN201820312213 U CN 201820312213U CN 207926475 U CN207926475 U CN 207926475U
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- voice coil
- coil motor
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- focusing
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Abstract
The utility model discloses a kind of closed-loop feedback arrangement of voice coil motor, voice coil motor and camera modules.The closed-loop feedback arrangement includes：First pole piece is arranged for the pole for forming capacitance structure that is powered on the movable component of voice coil motor；Second pole piece is arranged for another pole for forming capacitance structure that is powered on the fixation kit of voice coil motor；Processing module, the capacitance parameter of the capacitance structure for being formed according to first pole piece and the second pole piece calculate and export focusing driving current to the focusing drive component；Memory module, for storing the computer program executed for the processing module；The processing module is respectively electrically connected to the focusing drive component, the first pole piece, the second pole piece and memory module.The focusing feedback device has the advantages such as at low cost, perceived accuracy is high.
Description
Technical field
The utility model is related to field of photography more particularly to a kind of closed-loop feedback arrangement of voice coil motor, voice coil motor and
Camera module.
Background technology
With the development of photography technology, existing voice coil motor is widely used closed-loop feedback manner to carry out focusing drive
It is dynamic.In closed loop voice coil motor, generally use Hall sensor perceives moving field caused by movable component, with this determines activity
Real time position of the component in focus process forms closed loop feedback, can quickly and accurately calculate by movable component drive to
Focusing driving current needed on focusing position, with rapid focus, the advantage precisely focused, but Hall sensor not only at
This is higher, and perceived accuracy also suffers from the influence of permanent magnetic field caused by fixation kit.
Utility model content
In order to solve above-mentioned the deficiencies in the prior art, the utility model provide a kind of closed-loop feedback arrangement of voice coil motor,
Voice coil motor and camera module.The focusing feedback device has the advantages such as at low cost, perceived accuracy is high.
Technical problem to be solved in the utility model is achieved by the following technical programs：
A kind of closed-loop feedback arrangement of voice coil motor, including：
First pole piece is arranged for the pole for forming capacitance structure that is powered on the movable component of voice coil motor；
Second pole piece is arranged for another pole for forming capacitance structure that is powered on the fixation kit of voice coil motor；
Processing module, the capacitance parameter of the capacitance structure for being formed according to first pole piece and the second pole piece, calculates
And focusing driving current is exported to the focusing drive component；
Memory module, for storing the computer program executed for the processing module；
The processing module is respectively electrically connected to the focusing drive component, the first pole piece, the second pole piece and memory module.
Further, when the processing module executes the computer program in the memory module, following steps are carried out：
Step 1：Obtain the capacitance parameter for the capacitance structure that first pole piece and the second pole piece are formed；
Step 2：According to the capacitance parameter obtained, calculate between the movable component of voice coil motor and fixation kit in optical axis
On relative distance；
Step 3：According to the relative distance calculated, calculates and drive movable component to driving electricity required on focusing position
Stream；
Step 4：Calculated driving current is exported to the focusing drive component.
Further, the capacitance parameter includes one of capacitance voltage, capacitance or charging and discharging currents.
A kind of voice coil motor, including movable component, fixation kit, focusing drive component and closed loop feedback component, it is described right
Burnt drive component is for driving the movable component to carry out mobile focusing on optical axis relative to the fixation kit；The closed loop
Feedback component includes the first pole piece and the second pole piece, and first pole piece is arranged on the movable component, is formed for being powered
One pole of capacitance structure；Second pole piece is arranged on the fixation kit, for another pole for forming capacitance structure that is powered.
Further, the focusing drive component includes moving field producing element and permanent magnetic field producing element, the dynamic magnetic
Field producing element is arranged on the movable component, for the moving field for generating focusing driving that is powered；The permanent magnetic field generates
Element is arranged on the fixation kit, the permanent magnetic field for generating focusing driving；Between the moving field and permanent magnetic field
Movable component described in interaction power drive carries out mobile focusing on optical axis.
Further, further include upper shrapnel and lower shrapnel, the interior outside of the upper shrapnel, which is separately connected, is fixed on the work
The upper end of the upper end and the fixation kit of dynamic component, the interior outside of the lower shrapnel, which is separately connected, is fixed on the movable component
Lower end and the fixation kit lower end.
Further, the focusing drive component includes several memorial alloy columns, is connected to the movable component and fixation
Between component, for being powered, generation deformation drives the movable component to carry out mobile focusing on optical axis.
Further, the movable component further includes carrier, and/or, the fixation kit further includes pedestal and is set in
Shell on the pedestal.
Further, the fixation kit further includes connection terminal, and the connection terminal is respectively electrically connected to described first
Pole piece, the second pole piece and focusing drive component.
A kind of camera module, including above-mentioned voice coil motor.
The utility model has the advantages that：The focusing feedback device is led to respectively using the first pole piece and the second pole piece
The capacitance structure of electric forming carrys out feedback position information, and closed loop feedback is formed in the focus process of voice coil motor, to substitute tradition
Hall sensor, the advantages that have that at low cost, perceived accuracy is high etc..
Description of the drawings
Fig. 1 is the functional block diagram of the closed-loop feedback arrangement of voice coil motor provided by the utility model；
Fig. 2 is the work step block diagram of the closed-loop feedback arrangement of voice coil motor provided by the utility model；
Fig. 3 is the schematic diagram of voice coil motor provided by the utility model；
Fig. 4 is the schematic diagram of another voice coil motor provided by the utility model.
Specific implementation mode
The utility model is described in detail with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of closed-loop feedback arrangement of voice coil motor, including：
First pole piece is arranged for the pole for forming capacitance structure that is powered on the movable component of voice coil motor；
Second pole piece is arranged for another pole for forming capacitance structure that is powered on the fixation kit of voice coil motor；
Processing module, the capacitance parameter of the capacitance structure for being formed according to first pole piece and the second pole piece, calculates
And focusing driving current is exported to the focusing drive component；
Memory module, for storing the computer program executed for the processing module；
The processing module is respectively electrically connected to the focusing drive component, the first pole piece, the second pole piece and memory module.
Voice coil motor includes movable component, fixation kit and focusing drive component, and the focusing drive component is for driving
The movable component carries out mobile focusing relative to the fixation kit on optical axis.Wherein, the focusing drive component foundation
Voice coil motor it is different focusing driving type and it is different.
Such as：In the voice coil motor of common electromagnetic drive focusing, the focusing drive component includes that moving field generates member
Part and permanent magnetic field producing element, the moving field producing element are arranged on the movable component, are driven for being powered to generating to focus
The moving field employed；The permanent magnetic field producing element is arranged on the fixation kit, the permanent magnetism for generating focusing driving
；Movable component described in interaction power drive between the moving field and permanent magnetic field carries out mobile focusing on optical axis.Again
Such as：In the voice coil motor of memorial alloy driving focusing, the focusing drive component includes several memorial alloy columns, described several
Memorial alloy column is connected between the movable component and fixation kit, and for being powered, generation deformation drives the movable component to exist
Mobile focusing is carried out on optical axis.
Certainly, also other it is a variety of focusing type of drive voice coil motor, differ a citing herein.
First pole piece and the second pole piece a capacitance structure can be collectively formed using air as medium after being separately energized,
In the focus process of voice coil motor, first pole piece is as the movable component on optical axis when moving, first pole
Distance between piece and the second pole piece on optical axis can change, and lead to the relevant capacitor parameter of the capacitance structure of the two formation
It also can be with changing；The relevant capacitor parameter that the processing module is changed by reading, then pass through preset computer journey
Algorithm in sequence calculates the relative distance on optical axis between the movable component and fixation kit, with the determination activity group
Real time position of the part in focus process finally calculates and output driving current is to the focusing drive component.
Optimally, first pole piece and the second pole piece are plate or sheet, are spatially overlapped along optical axis.
As shown in Fig. 2, when the processing module executes the computer program in the memory module, following steps are carried out：
Step 1：Obtain the capacitance parameter for the capacitance structure that first pole piece and the second pole piece are formed；
Step 2：According to the capacitance parameter obtained, calculate between the movable component of voice coil motor and fixation kit in optical axis
On relative distance；
Step 3：According to the relative distance calculated, calculates and drive movable component to driving electricity required on focusing position
Stream；
Step 4：Calculated driving current is exported to the focusing drive component.
The capacitance parameter includes one of capacitance voltage, capacitance or charging and discharging currents.
In the capacitance of capacitance structure（The quantity of electric charge）In the case of constant, the capacitance voltage at capacitance structure both ends is with described
Distance between first pole piece and the second pole piece on optical axis increases and reduces；Capacitance voltage at capacitance structure both ends is constant
In the case of, the capacitance of capacitance structure increases as the distance between first pole piece and the second pole piece on optical axis increases
Add；It is of course also possible to calculate distance by size of current of the capacitance structure in charge and discharge process.
The capacitance structure to be formed is separately energized come feedback position using the first pole piece and the second pole piece in the focusing feedback device
Information forms closed loop feedback in the focus process of voice coil motor, to substitute traditional Hall sensor, has at low cost, sense
Know the advantages such as precision height.
Embodiment two
As shown in Figures 3 and 4, a kind of voice coil motor, including movable component, fixation kit, focusing drive component and closed loop are anti-
Component is presented, the focusing drive component is for driving the movable component to be moved on optical axis relative to the fixation kit
Focusing；The closed loop feedback component includes the first pole piece 41 and the second pole piece 42, and first pole piece 41 is arranged in the activity
On component, for the pole for forming capacitance structure that is powered；Second pole piece 42 is arranged on the fixation kit, for being powered
Form another pole of capacitance structure.
Wherein, it is described focusing drive component it is different according to the voice coil motor focusing driving type and it is different.
In the voice coil motor of electromagnetic drive focusing, as shown in figure 3, the focusing drive component includes moving field producing element
31 and permanent magnetic field producing element 32, the moving field producing element 31 is arranged on the movable component, is generated pair for being powered
The moving field of burnt driving；The permanent magnetic field producing element 32 is arranged on the fixation kit, is used for generating focusing driving
Permanent magnetic field；Movable component described in interaction power drive between the moving field and permanent magnetic field carries out mobile pair on optical axis
It is burnt.
In the present embodiment, the movable component further includes carrier 11, and/or, the fixation kit further includes 21 He of pedestal
The shell 22 being set on the pedestal 21；The accommodating chamber surrounded in the pedestal 21 and shell 22 is arranged in the movable component
It is interior.The moving field producing element 31 is an AF coils, is wrapped on the outer surface of the carrier 11；The permanent magnetic field generates member
Part 32 is several pieces of permanent magnets, is evenly arranged in outside the movable component and places.
Further include upper shrapnel 7 and lower shrapnel 6 in the voice coil motor, the interior outside of the upper shrapnel 7, which is separately connected, to be fixed on
The upper end of the movable component（The upper end of the carrier 11）With the upper end of the fixation kit（In the top surface of the shell 22
Side）, the interior outside of the lower shrapnel 6 is separately connected the lower end for being fixed on the movable component（The lower end of the carrier 11）And institute
State the lower end of fixation kit（The upper surface of the pedestal 21）.
In the voice coil motor of memorial alloy driving focusing, closed as shown in figure 4, the focusing drive component includes several memories
Principal column 33 is connected between the movable component and fixation kit, and the deformation driving movable component is generated in light for being powered
Mobile focusing is carried out on axis.
In the present embodiment, the movable component further includes carrier 11, and/or, the fixation kit further includes 21 He of pedestal
The shell 22 being set on the pedestal 21；The accommodating chamber surrounded in the pedestal 21 and shell 22 is arranged in the movable component
It is interior.The carrier 11 is supported on the top of the pedestal 21 by several memorial alloy columns 33.
One end of each memorial alloy column 33 is both connected on the carrier 11, and the other end is both connected to the pedestal 21
On, being made on the carrier 11 has stereo circuit, so that several memorial alloy columns 33 are led by stereo circuit formation
Logical circuit；Alternatively, each memorial alloy column 33 is U-shaped, wherein the both ends of U-shaped are both connected on the pedestal 21, U-shaped
Bottom be connected on the carrier 11.The structure and conduction mode of the memorial alloy column 33 are not limited to above two.
Certainly, also other it is a variety of focusing type of drive voice coil motor, differ a citing herein.
Preferably, first pole piece 41 is annular plate-like or annular slice, and the carrier 11 in the movable component is arranged
Lower end, and be looped around the outer of its light hole and place；Second pole piece 42 is also annular plate-like or annular slice, is arranged described
21 upper surface of pedestal of fixation kit, and be looped around the outer of its light hole and place.According to different voice coil motor structures, described
22 inside top surface of shell in the fixation kit can also be arranged in two pole pieces 42.
Optimally, first pole piece, 41 and second pole piece 42 is spatially overlapped along optical axis.
The fixation kit further includes connection terminal 24, and the connection terminal 24 is respectively electrically connected to first pole piece
41, the second pole piece 42 and focusing drive component（Moving field producing element 31 or memorial alloy column 33）.First pole piece 41,
Two pole pieces 42 and focusing drive component are electrically connected to the processing module on the wiring board of camera module by the connection terminal 24.
In the present embodiment, the connection terminal 24 is several metals through the upper and lower surface of the pedestal 21
PIN。
Embodiment three
A kind of camera module, including voice coil motor, camera lens, sensitive chip and wiring board described in embodiment two, it is described
Voice coil motor and sensitive chip are electrically connected and secured on the wiring board, wherein the voice coil motor is located at described photosensitive
The top of chip；The camera lens is assemblied in the carrier 11 of the voice coil motor.
Processing module and memory module are additionally provided on the wiring board, the processing module is distinguished by the wiring board
It is electrically connected to the memory module and voice coil motor.
The embodiment of the utility model above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Cannot it therefore be interpreted as the limitation to the utility model patent range, as long as using the form institute of equivalent substitution or equivalent transformation
The technical solution of acquisition, shall fall within the scope of the present invention.
Claims (9)
1. a kind of closed-loop feedback arrangement of voice coil motor, which is characterized in that including：
First pole piece is arranged for the pole for forming capacitance structure that is powered on the movable component of voice coil motor；
Second pole piece is arranged for another pole for forming capacitance structure that is powered on the fixation kit of voice coil motor；
Processing module, the capacitance parameter of the capacitance structure for being formed according to first pole piece and the second pole piece, calculates and defeated
Go out to focus driving current to voice coil motor focusing drive component；
Memory module, for storing the computer program executed for the processing module；
The processing module is respectively electrically connected to the focusing drive component, the first pole piece, the second pole piece and memory module.
2. the closed-loop feedback arrangement of voice coil motor according to claim 1, which is characterized in that the capacitance parameter includes electricity
Hold one of voltage, capacitance or charging and discharging currents.
3. a kind of voice coil motor, including movable component, fixation kit, focusing drive component and closed loop feedback component, the focusing
Drive component is for driving the movable component to carry out mobile focusing on optical axis relative to the fixation kit；Its feature exists
In the closed loop feedback component includes the first pole piece and the second pole piece, and first pole piece is arranged on the movable component, uses
In the pole for forming capacitance structure that is powered；Second pole piece is arranged on the fixation kit, and capacitive junctions are formed for being powered
Another pole of structure.
4. voice coil motor according to claim 3, which is characterized in that the focusing drive component includes that moving field generates member
Part and permanent magnetic field producing element, the moving field producing element are arranged on the movable component, are driven for being powered to generating to focus
The moving field employed；The permanent magnetic field producing element is arranged on the fixation kit, the permanent magnetism for generating focusing driving
；Movable component described in interaction power drive between the moving field and permanent magnetic field carries out mobile focusing on optical axis.
5. voice coil motor according to claim 4, which is characterized in that further include upper shrapnel and lower shrapnel, the upper shrapnel
Interior outside be separately connected the upper end of the upper end for being fixed on the movable component and the fixation kit, the lower shrapnel it is inside and outside
Side is separately connected the lower end of the lower end for being fixed on the movable component and the fixation kit.
6. voice coil motor according to claim 3, which is characterized in that the focusing drive component includes several memorial alloys
Column is connected between the movable component and fixation kit, and the deformation driving movable component is generated in optical axis for being powered
Carry out mobile focusing.
7. according to any voice coil motor in claim 3-6, which is characterized in that the movable component includes carrier, and/
Or, the fixation kit includes pedestal and is arranged shell on the base.
8. according to any voice coil motor in claim 3-6, which is characterized in that the fixation kit further includes connecting pin
Son, the connection terminal are respectively electrically connected to first pole piece, the second pole piece and focusing drive component.
9. a kind of camera module, which is characterized in that including any voice coil motor in claim 3-8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820312213.1U CN207926475U (en) | 2018-03-07 | 2018-03-07 | A kind of closed-loop feedback arrangement of voice coil motor, voice coil motor and camera module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820312213.1U CN207926475U (en) | 2018-03-07 | 2018-03-07 | A kind of closed-loop feedback arrangement of voice coil motor, voice coil motor and camera module |
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| CN207926475U true CN207926475U (en) | 2018-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242907A (en) * | 2018-03-07 | 2018-07-03 | 信利光电股份有限公司 | A kind of closed-loop feedback arrangement of voice coil motor, voice coil motor and camera module |
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2018
- 2018-03-07 CN CN201820312213.1U patent/CN207926475U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108242907A (en) * | 2018-03-07 | 2018-07-03 | 信利光电股份有限公司 | A kind of closed-loop feedback arrangement of voice coil motor, voice coil motor and camera module |
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