CN101488058B - Optical sensing apparatus and its operation method - Google Patents
Optical sensing apparatus and its operation method Download PDFInfo
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- CN101488058B CN101488058B CN200810000500XA CN200810000500A CN101488058B CN 101488058 B CN101488058 B CN 101488058B CN 200810000500X A CN200810000500X A CN 200810000500XA CN 200810000500 A CN200810000500 A CN 200810000500A CN 101488058 B CN101488058 B CN 101488058B
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Abstract
The invention provides an optical sensing device which at least comprises a sensor which is used for sensing a reflected light, an image capture unit which is used for reading the reflected light and calculating the average light intensity, a light source intensity controller which is used for outputting a control signal according to the average light intensity of the reflected light, a light source driver which receives the control signal to output a drive current, and a light source which receives the drive current and lightens correspondingly. The optical sensing device can adjust and sense the brightness of the light source according to surface color, so as to compensate the surface reflectivity deviation.
Description
Technical field
The present invention relates to a kind of optical sensing apparatus and method of operating thereof, particularly relate to a kind of optical sensing apparatus and the method for operating thereof that can adjust according to surface color the sensing light source.
Background technology
Optical mouse is to use optical sensor that one reflection backing plate is transmitted, and calculate moving direction and distance by the signal that receives after the reflection of reflection backing plate, therefore reflect the surface appearance of backing plate or the execution usefulness that surface color all can affect optical mouse.Be a dark coloured surface when reflecting the backing plate surface for example, during the relatively poor reflectivity of tool, this moment can be by the picture frame detecting frequency (frame rate) of adjusting optical sensor, so as to increasing the time shutter, compensate the signal because of the not enough reflection of reflectivity variation, yet this kind compensation way will affect the usefulness of mouse.
Therefore, how in the situation that do not affect the target of sensing shortcoming for pursuing that the compensation of mouse usefulness causes because of the surface reflectivity variation.
This shows, above-mentioned existing optical mouse obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, finished by development but have no for a long time applicable design always, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious wish of relevant dealer solves.Therefore how to found a kind of new optical sensing apparatus and method of operating thereof, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that above-mentioned existing optical mouse exists, the inventor is based on being engaged in for many years abundant practical experience and professional knowledge of this type of product design manufacturing, and the utilization of cooperation scientific principle, positive research and innovation in addition, to founding a kind of new optical sensing apparatus and method of operating thereof, can improve general existing optical mouse, make it have more practicality.Through constantly research, design, and through after repeatedly studying sample and improvement, finally create the present invention who has practical value.
Summary of the invention
Fundamental purpose of the present invention is, overcome the defective that existing optical mouse exists, and provide a kind of new optical sensing apparatus and method of operating thereof, technical matters to be solved is to make it adjust the sensing light-source brightness according to surface color, so as to compensating the problem of surface reflectivity variation, thereby more be suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.A kind of optical sensing apparatus according to the present invention proposes is characterized in that comprising at least: a sensor, in order to sensing one reflected light; One image acquisition unit couples this sensor, in order to read this reflected light and to calculate this catoptrical average luminous intensity; One intensity of light source controller couples this image acquisition unit, in order to export a control signal according to this catoptrical average luminous intensity; One light source drive couples this intensity of light source controller, in order to receive this control signal and to export a drive current according to this control signal; And one light source couple this light source drive, in order to receive this drive current and corresponding luminous.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid optical sensing apparatus, wherein said light source are a laser diode or a light emitting diode.
The work period that aforesaid optical sensing apparatus, wherein said control signal can change this drive current size or change this drive current.
The object of the invention to solve the technical problems also realizes by the following technical solutions.A kind of method for sensing that can immediately adjust the intensity of light source according to the present invention's proposition, wherein this light source can produce one first light signal, and this first light signal is reflected into one second light signal, and the method comprises at least: this second light signal of sensing within a schedule time; Read this second light signal and calculate the average luminous intensity of this second light signal; Average luminous intensity and a preset value of this second light signal are compared; And different from this preset value when the average luminous intensity of this second light signal, then adjusting this first light signal is one the 3rd light signal.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The aforesaid method for sensing that can immediately adjust the intensity of light source, wherein said light source are a laser diode or a light emitting diode.
The aforesaid method for sensing that can immediately adjust the intensity of light source, it more comprises:
Judge that this light source could produce the 3rd light signal; And
When this light source can not produce the 3rd light signal, adjust this schedule time.
The aforesaid method for sensing that can immediately adjust the intensity of light source, it more comprises:
Keep this first light signal when the average luminous intensity of this second light signal identical with this preset value.
The aforesaid method for sensing that can immediately adjust the intensity of light source, wherein when the average luminous intensity of this second light signal during greater than this preset value, this first light signal strength is greater than the 3rd light signal strength; And when the average luminous intensity of this second light signal during less than this preset value, this first light signal strength is less than the 3rd light signal strength.
The object of the invention to solve the technical problems also realizes in addition by the following technical solutions.According to a kind of method for sensing that can immediately adjust the intensity of light source that the present invention proposes, wherein this light source can produce one first light signal, and this first light signal is reflected into one second light signal, and the method comprises at least: set an acceptable average luminous intensity scope; This second light signal of sensing within a schedule time; Read this second light signal and calculate the average luminous intensity of this second light signal; The average luminous intensity of this second light signal is compared with this acceptable average luminous intensity scope; And do not drop in this acceptable average luminous intensity scope when the average luminous intensity of this second light signal, then adjusting this first light signal is one the 3rd light signal.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The aforesaid method for sensing that can immediately adjust the intensity of light source, wherein said light source are a laser diode or a light emitting diode.
The aforesaid method for sensing that can immediately adjust the intensity of light source, it more comprises:
Judge that this light source could produce the 3rd light signal; And
When this light source can not produce the 3rd light signal, adjust this schedule time.
The aforesaid method for sensing that can immediately adjust the intensity of light source, it more comprises:
Keeping this first light signal drops in this acceptable average luminous intensity scope when the average luminous intensity of this second light signal.
The aforesaid method for sensing that can immediately adjust the intensity of light source, wherein said the 3rd light signal is reflected into one the 4th light signal, and the average luminous intensity of the 4th light signal drops in this acceptable average luminous intensity scope.
The present invention compared with prior art has obvious advantage and beneficial effect.By above technical scheme as can be known, main technical content of the present invention is as follows:
In order to achieve the above object, the invention provides a kind of optical sensing apparatus, comprise at least: a sensor, in order to sensing one reflected light; One image acquisition unit couples this sensor, in order to read this reflected light and to calculate this catoptrical average luminous intensity; One intensity of light source controller couples this image acquisition unit, in order to export a control signal according to this catoptrical average luminous intensity; One light source drive couples this intensity of light source controller, in order to receive this control signal and to export a drive current according to this control signal; And one light source couple this light source drive, in order to receive this drive current and corresponding luminous.
In addition, in order to achieve the above object, the present invention provides a kind of method for sensing that can immediately adjust the intensity of light source in addition, and wherein this light source can produce one first light signal, and this first light signal is reflected into one second light signal, comprises: this second light signal of sensing within a schedule time; Read this second light signal and calculate the average luminous intensity of this second light signal; Average luminous intensity and a preset value of this second light signal are compared; And to adjust this first light signal be one the 3rd light signal when the average luminous intensity of this second light signal different from this preset value.
By technique scheme, optical sensing apparatus of the present invention and method of operating thereof have following advantages at least: because method of the present invention is adjusted the sensing light-source brightness according to surface color, problem so as to compensation surface reflectivity variation, therefore need not change the picture frame detecting frequency (framerate) of optical sensor, so as to increasing/the minimizing time shutter, therefore can not affect the usefulness of mouse.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, and for above and other purpose of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and the cooperation accompanying drawing, be described in detail as follows.
Description of drawings
Fig. 1 is the optical sensing apparatus skeleton diagram that one preferred embodiment can be adjusted according to surface color the sensing light-source brightness according to the present invention.
Fig. 2 is the present invention's one preferred embodiment is adjusted the sensing light-source brightness according to surface color process flow diagram.
Fig. 3 is the process flow diagram of adjusting the sensing light-source brightness according to this preferred embodiment.
Fig. 4 then is a tolerance interval of the reflected light signal intensity that sets in certain time shutter in lower time according to this preferred embodiment.
100: optical sensing apparatus 1001: light source
1002: light source drive 1003: intensity of light source controller
1004: image acquisition unit 1005: sensor
102: reflecting plate 103: light signal
104: reflected light signal 201-206,301-307: step
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked in order further to set forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, optical sensing apparatus and its embodiment of method of operating, structure, feature and effect thereof to foundation the present invention proposes are described in detail as follows.
Figure 1 shows that according to the present invention one preferred embodiment can adjust according to surface color the optical sensing apparatus skeleton diagram of sensing light-source brightness.Optical sensing apparatus 100 of the present invention comprises: a light source 1001, a light source drive 1002, an intensity of light source controller 1003, an image acquisition unit 1004 and a sensor 1005.Wherein light source 1001, for example are a laser diode or a light emitting diode.When operation, light source 1001 can be to reflecting plate 102 emissions one light signal 103, through reflecting plate 102 reflections, after sensor 1005 senses this reflected light signal 104, this light signal can be transferred into image acquisition unit 1004 this reflected light signal 104 is carried out video recording analysis and intensity interpretation, and intensity of light source controller 1003 can be adjusted according to the intensity sentence read result of image acquisition unit 1004 output driving current of light source drive 1002, adjusts the brightness of light source 1001 by different drive currents.
In other words, under framework of the present invention, the output brightness of light source 1001 can be changed according to the surface state of reflecting plate 102.For example, when the surface of reflecting plate 102 is a dark surface, cause the undercapacity of reflected light signal 104, this moment, image acquisition unit 1004 meetings send the sentence read result of reflected light signal 104 undercapacities to intensity of light source controller 1003, control light source drive 1002 increases the drive current size of output, so as to increasing light signal 103 intensity of light source 1001.Because the strength increase of light signal 103, so the intensity of reflected light signal 104 also can increase.In other words, utilize the increase of light signal 103 intensity can compensate the antiradar reflectivity on dark surface, need not change the picture frame detecting frequency and obtain identical exposure, therefore can't affect the execution usefulness of optical sensing apparatus 100.
And on the other hand, when the surface of reflecting plate 102 is a smooth surface, cause the intensity of reflected light signal 104 to be crossed when strong, this moment, image acquisition unit 1004 meetings send the excessively strong sentence read result of reflected light signal 104 intensity to intensity of light source controller 1003, control light source drive 1002 reduces the drive current size of output, so as to reducing light signal 103 intensity of light source 1001, lower reflected light signal 104 intensity, so also low-energy consumption can be fallen.Wherein control the intensity of light source 1001 output optical signals, except can directly changing the output driving current size by light source drive 1002, in another embodiment, also can in the situation that do not change the output driving current size, utilize the mode that changes the work period (duty cycle) to be finished.
Consult and Figure 2 shows that the present invention's one preferred embodiment is according to the process flow diagram of surface color adjustment sensing light-source brightness.Please consult simultaneously Fig. 1 and Fig. 2, at first in step 201, image acquisition unit 1004 can read reflected light signal 104 that sensor 1005 senses and the mean flow rate of this reflected light signal 104 of interpretation.Then in step 202, judge whether these reflected light signal 104 mean flow rates reach a desired value.After the mean flow rate of reflected light signal 104 had reached desired value, the light intensity that represents reflected light signal 104 met the requirements, meeting this moment execution in step 203, the time shutter sensing reflected light signal 104 of sensor 1005 to set.When mean flow rate and the desired value of reflected light signal 104 is not inconsistent, the light intensity that represents reflected light signal 104 does not meet or exceeds requirement, meeting this moment execution in step 204, the output driving current of adjustment light source drive 1002 is adjusted the brightness of light source 1001 by different drive currents.And in step 205, judge that the adjustment rear drive electric current transfer to light source 1001 is whether in light source 1001 acceptable scopes, so as to avoiding damaging light source 1001.If adjusting the rear drive electric current is in light source 1001 acceptable scopes, then carry out the brightness adjustment of light source 1001, and execution in step 201 again.Anti-, exceed light source 1001 acceptable scopes if adjust the rear drive electric current, then do not carry out the brightness adjustment of light source 1001, and execution in step 206, in known manner, for example by adjusting the picture frame detecting frequency (frame rate) of sensor to reflected light signal 104, so as to increasing/the minimizing time shutter.
In addition, in another embodiment of the present invention, for avoiding 1001 little errors because of reflected light signal 104 of light source, then need the drive current of variable light source 1001 to change luminous intensity, cause switching too frequent.Therefore in this embodiment, by a tolerance interval of setting reflected light signal 104, just the drive current of light source 1001 is changed when exceeding this tolerance interval.Figure 3 shows that the process flow diagram of adjusting the sensing light-source brightness according to this preferred embodiment.Consult the tolerance interval of the reflected light signal intensity that sets in certain time shutter in lower time according to this preferred embodiment of then being shown in Figure 4.
According to Fig. 4, to suppose under certain time shutter T, acceptable reflected light signal 104 strength ranges are to drop on V
HAnd V
LBetween, and producible reflected light signal 104 intensity are maximum and little value is respectively V
MaxAnd V
MinEasy speech, when the intensity of reflected light signal 104 is when dropping on this tolerance interval, drive current that can't variable light source 1001.And the intensity of working as reflected light signal 104 surpasses V
HThe time, drive current that can variable light source 1001 reduces light signal 103 intensity of light source 1001, is V so as to lowering reflected light signal 104 intensity
HOtherwise, when the intensity of reflected light signal 104 is lower than V
LThe time, drive current that can variable light source 1001 increases light signal 103 intensity of light source 1001, is V so as to increasing reflected light signal 104 intensity
L
It controls process flow diagram as shown in Figure 3, please consults simultaneously Fig. 3 and Fig. 4.At first in step 301, the intensity of detection of reflected light signal 104 under certain time shutter T.Then in step 302, judge whether the intensity of this reflected light signal 104 surpasses V
HIf the intensity of this reflected light signal 104 does not surpass V
H, then in step 303, judge that whether the intensity of this reflected light signal 104 is less than V
LIf the intensity of reflected light signal 104 is not less than V
L, the intensity that then represents reflected light signal 104 is to drop in the tolerance interval, so district's streaming current of light source 1001 can't be changed.And the intensity of working as reflected light signal 104 surpasses V
HThe time, then execution in step 304, judge whether the drive current of light source 1001 has been minimum value V
MinIf not, be minimum value V
Min, then execution in step 306, reduce the drive current of light source 1001, and lowering reflected light signal 104 intensity is V
HOtherwise, if be minimum value V
Min, then reflected light signal 104 intensity can't change by changing the driving electric weight, then come back to step 301.On the other hand, the intensity when reflected light signal 104 is lower than V
LThe time, then execution in step 305, judge whether the drive current of light source 1001 has been maximal value V
MaxIf not, be maximal value V
MaxThen execution in step 307, increase the drive current of light source 1001, are V so as to increasing reflected light signal 104 intensity
LOtherwise, if be maximal value V
Max, then reflected light signal 104 intensity can't change by changing the driving electric weight, then come back to step 301.
It should be noted that in the above-described embodiment, all is that the intensity with reflected light signal 104 changes to V
HAnd V
LYet, in another embodiment, also the intensity of reflected light signal 104 can be changed to V
HAnd V
LBetween.
Generally speaking, because method of the present invention is adjusted the sensing light-source brightness according to surface color, problem so as to compensation surface reflectivity variation, therefore need not change the picture frame detecting frequency (frame rate) of optical sensor, so as to increasing/the minimizing time shutter, therefore can not affect the usefulness of mouse.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet be not to limit the present invention, any those skilled in the art, within not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (13)
1. optical sensing apparatus is characterized in that comprising at least:
One sensor is in order to sensing one reflected light;
One image acquisition unit couples this sensor, in order to read this reflected light and to calculate this catoptrical average luminous intensity;
One intensity of light source controller couples this image acquisition unit, in order to export a control signal according to this catoptrical average luminous intensity;
One light source drive couples this intensity of light source controller, in order to receive this control signal and to export a drive current according to this control signal; And
One light source couples this light source drive, in order to receive this drive current and corresponding luminous.
2. optical sensing apparatus according to claim 1 is characterized in that wherein said light source is a laser diode or a light emitting diode.
3. optical sensing apparatus according to claim 1 is characterized in that the work period that wherein said control signal can change this drive current size or change this drive current.
4. the method for sensing that can immediately adjust the intensity of light source, wherein this light source can produce one first light signal, and this first light signal is reflected into one second light signal, it is characterized in that the method comprises at least:
This second light signal of sensing within a schedule time;
Read this second light signal and calculate the average luminous intensity of this second light signal;
Average luminous intensity and a preset value of this second light signal are compared; And
Different from this preset value when the average luminous intensity of this second light signal, adjust the drive current that outputs to this light source, this first light signal that this light source is produced is changed into one the 3rd light signal.
5. the method for sensing that can immediately adjust the intensity of light source according to claim 4 is characterized in that wherein said light source is a laser diode or a light emitting diode.
6. the method for sensing that can immediately adjust the intensity of light source according to claim 4 is characterized in that it more comprises:
Judge that this light source could produce the 3rd light signal; And
When this light source can not produce the 3rd light signal, adjust this schedule time.
7. the method for sensing that can immediately adjust the intensity of light source according to claim 4 is characterized in that it more comprises:
Keep this first light signal when the average luminous intensity of this second light signal identical with this preset value.
8. the method for sensing that can immediately adjust the intensity of light source according to claim 4, when it is characterized in that wherein average luminous intensity when this second light signal is greater than this preset value, this first light signal strength is greater than the 3rd light signal strength; And when the average luminous intensity of this second light signal during less than this preset value, this first light signal strength is less than the 3rd light signal strength.
9. the method for sensing that can immediately adjust the intensity of light source, wherein this light source can produce one first light signal, and this first light signal is reflected into one second light signal, it is characterized in that the method comprises at least:
Set an acceptable average luminous intensity scope;
This second light signal of sensing within a schedule time;
Read this second light signal and calculate the average luminous intensity of this second light signal;
The average luminous intensity of this second light signal is compared with this acceptable average luminous intensity scope; And
When the average luminous intensity of this second light signal does not drop in this acceptable average luminous intensity scope, adjust the drive current that outputs to this light source, this first light signal that this light source is produced is changed into one the 3rd light signal.
10. the method for sensing that can immediately adjust the intensity of light source according to claim 9 is characterized in that wherein said light source is a laser diode or a light emitting diode.
11. the method for sensing that can immediately adjust the intensity of light source according to claim 9 is characterized in that more comprising:
Judge that this light source could produce the 3rd light signal; And
When this light source can not produce the 3rd light signal, adjust this schedule time.
12. the method for sensing that can immediately adjust the intensity of light source according to claim 9 is characterized in that more comprising:
Keeping this first light signal drops in this acceptable average luminous intensity scope when the average luminous intensity of this second light signal.
13. the method for sensing that can immediately adjust the intensity of light source according to claim 9, it is characterized in that wherein said the 3rd light signal is reflected into one the 4th light signal, and the average luminous intensity of the 4th light signal drops in this acceptable average luminous intensity scope.
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| CN101488058B true CN101488058B (en) | 2013-05-01 |
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| TW201214244A (en) * | 2010-09-30 | 2012-04-01 | Accupoint Technology Inc Lcd | Object sensing device |
| CN104008522A (en) * | 2014-06-13 | 2014-08-27 | 无锡英斯特微电子有限公司 | Self-adaptation current regulation and control method in photoelectric navigation device |
| CN105962922B (en) * | 2016-04-19 | 2018-11-27 | 矽力杰半导体技术(杭州)有限公司 | Photoelectric sensor, photoelectric detecting method and the heart rate detection equipment using it |
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| CN2643394Y (en) * | 2003-07-04 | 2004-09-22 | 昆盈企业股份有限公司 | Illuminance adjustable optical pointer |
| CN1652144A (en) * | 2004-02-04 | 2005-08-10 | 凌阳科技股份有限公司 | Apparatus for regulating and controlling optical mouse light source by pulse width |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2643394Y (en) * | 2003-07-04 | 2004-09-22 | 昆盈企业股份有限公司 | Illuminance adjustable optical pointer |
| CN1652144A (en) * | 2004-02-04 | 2005-08-10 | 凌阳科技股份有限公司 | Apparatus for regulating and controlling optical mouse light source by pulse width |
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