CN203658667U - Liquid lens focusing system based on phase-locked loop - Google Patents
Liquid lens focusing system based on phase-locked loop Download PDFInfo
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- CN203658667U CN203658667U CN201420037113.4U CN201420037113U CN203658667U CN 203658667 U CN203658667 U CN 203658667U CN 201420037113 U CN201420037113 U CN 201420037113U CN 203658667 U CN203658667 U CN 203658667U
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- 239000007788 liquid Substances 0.000 title claims abstract description 39
- 238000005259 measurement Methods 0.000 claims abstract description 38
- 238000012545 processing Methods 0.000 claims abstract description 18
- 238000001914 filtration Methods 0.000 claims description 18
- 230000003111 delayed effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
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Abstract
The utility model relates to a liquid lens focusing system based on a phase-locked loop. The liquid lens focusing system comprises a distance measurement module, a data processing module, a drive circuit and a liquid lens. The distance measurement module comprises a frequency source, a delay module, the phase-locked loop, a light wave generator, a light wave receiver and a filter module. The frequency source sends frequency-constant signals to the light wave generator; the light wave generator generates a measurement light wave, sends a part of the measurement light wave to the delay module and emits the other part of the measurement light wave out; the light wave receiver receives the measurement light wave, the received reflected measurement light wave being a reflection light wave; the reflection light wave is sent to the filter module; the delayed measurement light wave and the filtered reflection light are input to the phase-locked loop; and the phase-locked loop outputs a distance voltage signal. The distance measurement module, the data processing module, the drive circuit and the liquid lens are in electrical connection in sequence. According to the liquid lens focusing system based on the phase-locked loop, focusing precision and focusing speed are improved, the structure of the focusing system is simplified, the size of the focusing system is reduced, and the cost of the system is reduced.
Description
Technical field
The utility model relates to a kind of focusing system, particularly a kind of liquid lens focusing system and focusing system based on phaselocked loop.
Background technology
Along with the fast development of mobile terminal, be integrated with the mobile terminal of camera, be particularly integrated with high pixel, constantly increase with the demand of the mobile terminal of automatic focusing function.But in relevant prior art, focus process all, by repeatedly adjusting just and complete, exemplifies several method:
1. first set a reference picture, set dynamic thresholding, adjust the focal length of optical element, finally focus;
2. set predetermined focusing reference position, focus regulating mechanism adjusting focal length progressively within the scope of adjustable focal length, catches picture analysis, obtains best focal position, then controls gear train optical module is adjusted to best focal position;
3. first environment is scanned, predict the possible position of focus, then confirm successively the particular location of focus;
4. first receive image, judge focus level, then control gear train and scan between the focal region of pre-judgement, utilize image analysis processing system to judge after best focus image, control gear train optical module is adjusted to best focus position;
5. with respect to the progressively comparison to the left or to the right of the center position of zoom lens, thereby find the maximum evaluation of estimate of wanting photographic images, best focus position adjusted to by optical module by any control kinematic train mechanism.
All these methods have following shortcoming:
1. focus process complexity, speed is slow;
2. need gearing (scan driving mechanism and focus regulating mechanism), thereby increased the structure of focusing system, the complexity of control, reduced focusing speed;
3. volume is large, not light;
4. cost is high.
Above-mentioned drawbacks limit with high pixel, there is the development of the mobile terminal of automatic focusing function.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of liquid lens focusing system and focusing system based on phaselocked loop that can a step completes, increases focusing precision, improves focusing speed.
The technical scheme that the utility model solves the problems of the technologies described above is as follows: a kind of liquid lens focusing system based on phaselocked loop, comprises range finder module, data processing module, driving circuit and liquid lens;
Described range finder module comprises frequency source, Postponement module, phaselocked loop, light wave generator, light wave receiver and filtration module;
Described range finder module, data processing module, driving circuit and liquid lens are electrically connected successively, data processing module is according to the distance voltage signal of range finder module output, output is apart from value, and obtain the input value of driving circuit according to object distance value, driving circuit to the control voltage on liquid lens, and then regulates the focal length of liquid lens according to input value regulation output;
Described frequency source sends signal that frequency is constant to light wave generator, light wave generator produces the measurement light wave of corresponding frequencies according to the frequency of the signal receiving, send to Postponement module to postpone a part of measurement light wave, another part is measured light wave and is launched, described light wave receiver receives and runs into the measurement light wave that testee reflects, the measurement light wave reflecting receiving is reflecting light, send to filtration module to carry out filtering reflecting light, measurement light wave through postponing and reflecting light are after filtering input in phaselocked loop, phaselocked loop is according to the measurement light wave of input and the phase differential of reflecting light, output is apart from voltage signal.
The beneficial effects of the utility model are: the utility model utilizes phaselocked loop to survey the phase differential of transmitting light wave and reflecting light, and algorithm is simple, and precision is high, and cost is low; Utilize liquid lens zoom, small-sized, the compact advantage of existing digital zoom method, has again the high-resolution resolution of optical zoom, there is no gear train, simple in structure, easy to use, focusing speed is exceedingly fast, focus effective, frequency of light wave is adjustable, can meet the range finding requirement of different finding ranges.
On the basis of technique scheme, the utility model can also do following improvement.
Further, described Postponement module is lag line or phase shifter.
Further, described light wave generator is infrared launcher, and light wave receiver is infrared receiving device.
Further, described light wave generator is laser generator, and light wave receiver is laser pickoff.
The frequency of the signal that further, the measurement light wave frequency of described light wave generator transmitting is sent with frequency source is identical.
Brief description of the drawings
Fig. 1 is the utility model system architecture diagram figure;
Fig. 2 is the utility model data processing module workflow diagram.
In accompanying drawing, the list of parts of each label representative is as follows:
1, range finder module, 2, data processing module, 3, driving circuit, 4, liquid lens, 1.1, frequency source, 1.2, Postponement module, 1.3, phaselocked loop, 1.4, light wave generator, 1.5, light wave receiver, 1.6, filtration module.
Embodiment
Below in conjunction with accompanying drawing, principle of the present utility model and feature are described, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
As shown in Figure 1, be the utility model system architecture diagram; Fig. 2 is the utility model data processing module workflow diagram.
Embodiment 1
A liquid lens focusing system based on phaselocked loop, comprises range finder module 1, data processing module 2, driving circuit 3 and liquid lens 4;
Described range finder module 1 comprises frequency source 1.1, Postponement module 1.2, phaselocked loop 1.3, light wave generator 1.4, light wave receiver 1.5 and filtration module 1.6;
Described range finder module 1, data processing module 2, driving circuit 3 and liquid lens 4 are electrically connected successively, the distance voltage signal that data processing module 2 is exported according to range finder module 1, output is apart from value, and obtain the input value of driving circuit 3 according to object distance value, driving circuit 3 to the control voltage on liquid lens 4, and then regulates the focal length of liquid lens 4 according to input value regulation output;
Described frequency source 1.1 sends signal that frequency is constant to light wave generator 1.4, light wave generator 1.4 produces the measurement light wave of corresponding frequencies according to the frequency of the signal receiving, send to Postponement module 1.2 to postpone a part of measurement light wave, another part is measured light wave and is launched, described light wave receiver 1.5 receives and runs into the measurement light wave that testee reflects, the measurement light wave reflecting receiving is reflecting light, send to filtration module 1.6 to carry out filtering reflecting light, measurement light wave through postponing and reflecting light are after filtering input in phaselocked loop 1.3, phaselocked loop 1.3 is according to the measurement light wave of input and the phase differential of reflecting light, output is apart from voltage signal.
Described Postponement module 1.2 is lag line or phase shifter.
Described light wave generator 1.4 is infrared launcher, and light wave receiver 1.5 is infrared receiving device.
Described light wave generator 1.4 is laser generator, and light wave receiver 1.5 is laser pickoff.
The frequency of the signal that the measurement light wave frequency that described light wave generator 1.4 is launched is sent with frequency source 1.1 is identical.
A liquid lens focusing method based on phaselocked loop, comprises the following steps:
Step 1: frequency source 1.1 sends signal that frequency is constant to light wave generator 1.4;
Step 2: light wave generator 1.4 produces the measurement light wave of corresponding frequencies according to the frequency of the signal receiving, send to Postponement module 1.2 to postpone a part of measurement light wave, another part is measured light wave and is launched;
Step 3: described light wave receiver 1.5 receives and runs into the measurement light wave that testee reflects, and the measurement light wave reflecting receiving is reflecting light, sends to filtration module 1.6 to carry out filtering reflecting light;
Step 4: the measurement light wave through postponing and reflecting light are after filtering input in phaselocked loop 1.3, and phaselocked loop 1.3 is according to the measurement light wave of input and the phase differential of reflecting light, and output is apart from voltage signal;
Step 5: the distance voltage signal that data processing module 2 is exported according to range finder module 1, output is apart from value, and obtaining the input value of driving circuit 3 according to object distance value, driving circuit 3 to the control voltage on liquid lens 4, and then regulates the focal length of liquid lens 4 according to input value regulation output.
Described Postponement module 1.2 is lag line or phase shifter.
Described light wave generator 1.4 is infrared launcher, and light wave receiver 1.5 is infrared receiving device.
Described light wave generator 1.4 is laser generator, and light wave receiver 1.5 is laser pickoff.
The frequency of the signal that the measurement light wave frequency that described light wave generator 1.4 is launched is sent with frequency source 1.1 is identical.
In concrete enforcement, referring to Fig. 1, in range finder module 1, frequency source 1.1 sends signal that frequency is constant to light wave generator 1.4, light wave generator 1.4 produces the light wave of corresponding frequencies, and light wave runs into testee and reflects, and light wave receiver 1.5 receives reflection wave, and give filtration module 1.6 and process, remove the interference of natural light.A transmitting light wave part is passed to Postponement module 1.2, and Postponement module can postpone to launch the signal of light wave, equals the reflected light required time of module after filtering its time delay, and concrete realization as there is light wave can produce phase deviation after Postponement module.The utilizing emitted light that filtered reflected light and delayed module 1.2 postpone is as two input signals of phaselocked loop 1.3.Phaselocked loop 1.3 is exported the voltage signal being directly proportional to the phase differential of input signal, gives data processing module 2 process this signal.
Referring to Fig. 2, data processing module 2 is the circuit taking single-chip microcomputer as core, sets up look-up table 1 and look-up table 2 in single-chip microcomputer.Look-up table 1 receives the magnitude of voltage of the voltage signal of phaselocked loop output, exports corresponding object distance value; Again the object distance value calculating is input to look-up table 2, the input value of the driving circuit 3 of dispensing liquid camera lens.Value in two look-up table tables in single-chip microcomputer is measured by experiment, measures under n different object distance value, and the output voltage values of phaselocked loop, and this n is write in look-up table 1 voltage-object distance value, it is more accurate that n is not less than the larger measurement of 50, n.In when range finding, the magnitude of voltage of the phaselocked loop of measuring not in look-up table 1 time, adopts its corresponding distance value of interpolation calculation; Look-up table 2 is by object distance in optical lens, at a distance of, the satisfied relational expression of focal length, and liquid lens drives in chip that the relation of input value and output voltage values is determined.
The core of the driving circuit 3 of liquid lens is the driving chip of liquid lens, gives and drives chip to write different values, can export the control voltage of corresponding liquid lens.
The voltage of liquid lens 4 is controlled in driving circuit 3 outputs, changes the curvature of eyeglass, thereby changes the focus of eyeglass, makes the focal length of eyeglass reach pinpointed focus.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (5)
1. the liquid lens focusing system based on phaselocked loop, is characterized in that: comprise range finder module (1), data processing module (2), driving circuit (3) and liquid lens (4);
Described range finder module (1) comprises frequency source (1.1), Postponement module (1.2), phaselocked loop (1.3), light wave generator (1.4), light wave receiver (1.5) and filtration module (1.6);
Described range finder module (1), data processing module (2), driving circuit (3) and liquid lens (4) are electrically connected successively, data processing module (2) is according to the distance voltage signal of range finder module (1) output, output is apart from value, and obtain the input value of driving circuit (3) according to object distance value, driving circuit (3) to the control voltage on liquid lens (4), and then regulates the focal length of liquid lens (4) according to input value regulation output;
Described frequency source (1.1) sends signal that frequency is constant to light wave generator (1.4), light wave generator (1.4) produces the measurement light wave of corresponding frequencies according to the frequency of the signal receiving, send to Postponement module (1.2) to postpone a part of measurement light wave, another part is measured light wave and is launched, described light wave receiver (1.5) receives and runs into the measurement light wave that testee reflects, the measurement light wave reflecting receiving is reflecting light, send to filtration module (1.6) to carry out filtering reflecting light, measurement light wave through postponing and reflecting light are after filtering input in phaselocked loop (1.3), phaselocked loop (1.3) is according to the measurement light wave of input and the phase differential of reflecting light, output is apart from voltage signal.
2. liquid lens focusing system according to claim 1, is characterized in that: described Postponement module (1.2) is lag line or phase shifter.
3. liquid lens focusing system according to claim 1, is characterized in that: described light wave generator (1.4) is infrared launcher, and light wave receiver (1.5) is infrared receiving device.
4. liquid lens focusing system according to claim 1, is characterized in that: described light wave generator (1.4) is laser generator, and light wave receiver (1.5) is laser pickoff.
5. according to the arbitrary described liquid lens focusing system of claim 1 to 4, it is characterized in that: the frequency of the signal that the measurement light wave frequency of described light wave generator (1.4) transmitting is sent with frequency source (1.1) is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420037113.4U CN203658667U (en) | 2014-01-21 | 2014-01-21 | Liquid lens focusing system based on phase-locked loop |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420037113.4U CN203658667U (en) | 2014-01-21 | 2014-01-21 | Liquid lens focusing system based on phase-locked loop |
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| Publication Number | Publication Date |
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| CN203658667U true CN203658667U (en) | 2014-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420037113.4U Expired - Lifetime CN203658667U (en) | 2014-01-21 | 2014-01-21 | Liquid lens focusing system based on phase-locked loop |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103744176A (en) * | 2014-01-21 | 2014-04-23 | 武汉虹识技术有限公司 | Liquid lens focusing system and method based on phase-locked ring |
| CN109361876A (en) * | 2018-12-20 | 2019-02-19 | 广州医软智能科技有限公司 | Focusing circuit, method and microcirculation imaging device |
| CN113960704A (en) * | 2021-11-02 | 2022-01-21 | 深圳技术大学 | Automatic focusing method, system and device of liquid lens and storage medium |
-
2014
- 2014-01-21 CN CN201420037113.4U patent/CN203658667U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103744176A (en) * | 2014-01-21 | 2014-04-23 | 武汉虹识技术有限公司 | Liquid lens focusing system and method based on phase-locked ring |
| CN109361876A (en) * | 2018-12-20 | 2019-02-19 | 广州医软智能科技有限公司 | Focusing circuit, method and microcirculation imaging device |
| CN113960704A (en) * | 2021-11-02 | 2022-01-21 | 深圳技术大学 | Automatic focusing method, system and device of liquid lens and storage medium |
| CN113960704B (en) * | 2021-11-02 | 2023-10-27 | 深圳技术大学 | Automatic focusing method and device for liquid lens and storage medium |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140618 |