CN103057261A - Control method and control device used for edge detection device - Google Patents
Control method and control device used for edge detection device Download PDFInfo
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- CN103057261A CN103057261A CN201110329260XA CN201110329260A CN103057261A CN 103057261 A CN103057261 A CN 103057261A CN 201110329260X A CN201110329260X A CN 201110329260XA CN 201110329260 A CN201110329260 A CN 201110329260A CN 103057261 A CN103057261 A CN 103057261A
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Abstract
The invention discloses a control method and a control device used for an edge detection device. In the control method, the edge detection device comprises a lighting element, receives an output light meter generated based on a driving signal by the lighting element and generates a sensing signal. The control method includes the steps of determining a first strong-weak difference value corresponding to strong-weak difference of the sensing signal, adjusting the driving signal, determining a second strong and weak difference value based on the adjusted driving signal of the sensing signal, comparing the first strong and weak difference value with the second strong and weak difference value to generate a comparison result, and adjusting the driving signal based on the result meter.
Description
Technical field
The present invention relates to the edge detection device in the printing equipment, and be particularly related to a control method and relative control apparatus, it is in order to control the power output of a light-emitting component in the edge detection device.
Background technology
In general exist, carrying out a large amount of and during continuous printing (such as label printing) that content is identical, can apply to the technology of edge detection, it can determine the marginal position of thing to be printed, and then determines the starting point of printing, guarantees the position consistency of print content.
The technological concept of existing edge detection such as Fig. 1.As shown in the figure, edge detection device 120 includes light-emitting component 122 in order to producing an output light, and OPTICAL SENSORS 124 is in order to receiving this output light, and then produces a sensing signal.Edge detection device 120 is in order to carry out edge detection to the thing a plurality of to be printed 12 on the thing row 10 to be printed, and thing 12 to be printed is carried by a film 13.In general, the discontinuous local gap 11 that forms between the thing 12 to be printed, gap 11 is the part of film 13.Because thing 12 to be printed is different from film 13 materials, when output light was beaten at diverse location, the sensing signal that OPTICAL SENSORS 124 produces also can be different.When the output light that light-emitting component 122 is launched is directly beaten when film 13 (11 places, gap) is upper, because the light transmittance of film 13 is higher, so sensing signal has larger intensity, otherwise, when the output light that light-emitting component 122 is launched is beaten on thing 12 to be printed, because light transmittance is lower, thus the intensity of sensing signal then a little less than, above difference can be further with reference to the signal waveform (a) of figure 2.In the middle of, the center position that signal wave crest H place can be considered gap 11 is the sensing points P by sensor 124 by chance, because the center position in gap 11 has maximum light transmittance.
After the center position in gap 11 determines, just set the critical value TH of a signal strength signal intensity, when signal strength signal intensity is lower than critical value TH, judge it is that thing 12 to be printed is by sensing points P at this moment, when if signal strength signal intensity is higher than critical value TH, judge it is that gap 11 is by sensing points P at this moment.Thus, can determine the plotted point between gap 11 and the thing to be printed 12, the edge A of thing 12 to be printed namely, it can be used as the initial reference point of printing.
In general, critical value TH is approximately the intermediate point of sensing signal maximum (crest H place) and minimum of a value (L place), namely the critical value TH in Fig. 2 a-signal waveform.Yet, because sensing signal can be subject to the interference of noise usually, so in fact the waveform of sensing signal compares close to the signal waveform shown in Fig. 2 B.In addition, the difference between sensing signal maximum H and the minimum of a value L is decided along with the output light intensity of light-emitting component 122, and when the power output of light-emitting component 122 is larger, then the difference between sensing signal maximum and the minimum of a value is also thereupon larger, and vice versa.Yet, when the power output of light-emitting component 122 exceeds to a certain degree, difference between sensing signal maximum and the minimum of a value is also changed, signal waveform shown in Fig. 2 C, this signal waveform is corresponding to when light-emitting component 122 is high-power output, clearly, this moment sensing signal strong and weak difference: the difference between maximum H and the minimum of a value L is less than Fig. 2 A and Fig. 2 B.Be that the output light power of light-emitting component 122 is excessively strong about such phenomenon, strong to scope that can partial penetration thing 12 to be printed, so that the minimum of a value L of the sensing signal of this scope raising, thereby cause the maximum H of sensing signal and the difference between the minimum of a value L to diminish.Under the situation of Fig. 2 C, because noise jamming causes signal waveform indefinite (have more than one may crest), and the maximum H of sensing signal and minimum of a value L are too approaching again, the difficult so the decision of critical value TH becomes.Therefore, need a kind of mechanism that can in good time control the power output of light-emitting component, make the power output of light-emitting component remain on suitable scope, in order to correctly carry out edge detection.
Summary of the invention
In view of this, the object of the invention is to propose a kind of control method and relative control apparatus, it can be used in the edge detection device, the power output of control light-emitting component wherein, make the power output of light-emitting component be remained on suitable scope, avoid too high power output to cause the situation of edge detection difficulty with this.
Embodiments of the invention provide a kind of control method for an edge arrangement for detecting, wherein this edge detection device comprises a light-emitting component, and receive this light-emitting component and drive the output light that signal produces based on one and produce a sensing signal, the method comprises: determine one first strong and weak difference value corresponding to the strong and weak difference of this sensing signal; Adjust this driving signal, and determine one second strong and weak difference value of the driving signal after this sensing signal is based on this adjustment; Relatively this first strong and weak difference value and this second strong and weak difference value are to produce a comparative result; And adjust this driving signal according to this comparative result.
Embodiments of the invention provide a kind of control device for an edge arrangement for detecting, and wherein this edge detection device comprises a light-emitting component, and receive this light-emitting component and drive the output light that signal produces based on one and produce a sensing signal.This control method comprises: an adjusting module, in order to adjust this sensing signal; And a sensing signal intensity detecting module, it is in order to determining one first strong and weak difference value corresponding to the strong and weak difference of this sensing signal, and the one second strong and weak difference value that determines the driving signal after this sensing signal is adjusted based on this adjusting module; And a difference calculating module, in order to relatively this first strong and weak difference value and this second strong and weak difference value to produce a comparative result; Wherein, this adjusting module is adjusted this driving signal according to this comparative result.
Description of drawings
Fig. 1 is the schematic diagram of existing edge detection device.
Fig. 2 A～Fig. 2 C is the oscillogram of the sensing signal of existing edge detection device.
Fig. 3 is that strong and weak difference value is to the functional relation of the intensity level of driving signal.
Fig. 4 is the function block schematic diagram of the embodiment of control device of the present invention.
Figure 5 shows that the aging result who causes of light-emitting component.
Fig. 6 is the flow chart of the embodiment of control method of the present invention.
Wherein, description of reference numerals is as follows:
120,300: the edge detection device
122,400: light-emitting component
124,600: sensing apparatus
10: thing row to be printed
11: the gap
12: thing to be printed
13: film
500: control circuit
510～570: circuit module
The specific embodiment
In the middle of specification and follow-up claim, used some vocabulary to censure specific element.The person with usual knowledge in their respective areas should understand, and hardware manufacturer may be called same element with different nouns.This specification and follow-up claim are not used as distinguishing the mode of element with the difference of title, but the criterion that is used as distinguishing with the difference of element on function.Be an open term mentioned " comprising " in the middle of specification and the follow-up request item in the whole text, so should be construed to " comprise but be not limited to ".In addition, " couple " word and comprise any means that indirectly are electrically connected that directly reach at this.Therefore, be coupled to one second device if describe a first device in the literary composition, then represent this first device and can directly be electrically connected in this second device, or indirectly be electrically connected to this second device through other devices or connection means.
Please refer to Fig. 3, relation between the drive signal strength (wherein, the power output of drive signal strength and light-emitting component has again certain proportionate relationship) of its strong and weak difference value (maximum and minimum of a value poor) that is depicted as sensing signal and light-emitting component.As shown in the figure, in the drive signal strength value of light-emitting component during less than P, the strong and weak difference of sensing signal is directly proportional with the drive signal strength of light-emitting component, and when the driving signal of light-emitting component during greater than P, the strong and weak difference of sensing signal and the drive signal strength of light-emitting component are inversely proportional to.Therefore, in the optimal situation, the drive signal strength of light-emitting component need be controlled near the P value, this moment, the strong and weak difference of sensing signal was come maximum, also was conducive to the carrying out of edge detection.
The running of control circuit 500 of the present invention below will be described, please also refer to Fig. 3 and Fig. 4, Fig. 4 is the schematic diagram of control circuit of the present invention.As shown in the figure, control circuit 500 is coupled to edge survey and detects device 300, wherein the edge is surveyed and to be detectd device 300 and comprise a light-emitting component 400 and a sensor 600, and adjust for the driving signal S_Drv that drives light-emitting component 400 in order to the sensing signal S_Light that foundation sensor 600 produces, wherein driving signal S_Drv can be produced by control circuit 500, perhaps produced by other circuit, adjusted by control circuit 500 more subsequently.As shown in the figure, control circuit 500 includes a sensing signal intensity detecting module 510, a difference calculating module 520, a filtration module 530, an integration module 540, a slope modular converter 550 and a driving signal adjusting module 560.Sensing signal intensity detecting module 510 can be calculated the maximum of sensing signal S_Light and the difference between the minimum of a value, produce a strong and weak difference signal S_Light_Diff, wherein, sensing signal intensity detecting module 510 with the relative maximum of sensing signal S_Light within a period of time as maximum, the signal wave crest H that namely produces corresponding to the place of the central point in as shown in Figure 1 gap 11, and with the mean value of sensing signal S_Light within a period of time as relative minimum of a value, the mean values that namely produces in the scope corresponding to as shown in Figure 1 thing to be printed 12.After strong and weak difference signal S_Light_Diff determines, difference S_error between the strong and weak difference signal S_Light_Diff ' that difference calculating module 520 meeting calculating are previous and the present strong and weak difference signal S_Light_Diff, control circuit 500 is adjusted the intensity that drives signal S_Dry according to difference S_error.
At the beginning of control circuit 500 runnings, drive intensity level (it can be voltage or electric current) that signal adjusting module 560 will drive signal S_Drv by zero adjustment A most, at this moment, by present strong and weak difference value S_Light_Diff (driving the strong and weak difference that causes when signal S_Drv is A) greater than previous strong and weak difference value S_Light_Diff ' (driving the strong and weak difference that causes when signal S_Drv is zero), therefore, result according to intensity detecting module 510, drive signal adjusting module 560 and can continue to increase the intensity that drives signal S_Drv, to drive signal S_Drv increases a step (step), causes the intensity level that drives signal S_Drv can increase to B.Should be noted in the discussion above that in different embodiments of the invention, drive the driving signal S_Drv after signal adjusting module 560 can directly be exported adjustment, or export this step, and adjust driving signal S_Drv by the circuits/modules of outside.Afterwards, until drive signal S_Drv intensity in the adjustment mode that increases progressively step during to C, at this moment, present strong and weak difference value S_Light_Diff (the strong and weak difference when being C corresponding to driving signal S_Drv) is still greater than previous strong and weak difference value S_Light_Diff ' (the strong and weak difference when being B corresponding to driving signal S_Drv).At this moment, in different embodiments of the invention, drive signal adjusting module 560 and can select to continue to increase the intensity that drives signal S_Drv, or temporarily stop to increase the intensity that drives signal S_Drv.Select to continue to increase the intensity that drives signal S_Drv when driving signal adjusting module 560, and when the intensity level that drives signal S_Drv increases to D, this moment according to the detecting result of intensity detecting module 510 as can be known, present strong and weak difference signal S_Light_Diff is less than previous strong and weak difference value S_Light_Diff ', downgrade the intensity that drives signal S_Dry so that the intensity level of driving signal S_Dry falls within C point or E point so can change, finish the mode that script is adjusted to increase progressively step, and use comparatively accurately fine-tuning mode instead, make driving signal S_Drv be maintained at certain intensity level.Fine-tuning mode of the present invention is described as follows:
At first, difference calculating module 520 can be used as reference value with the corresponding strong and weak difference value S_reference1 of the intensity level of present driving signal S_Drv or S_reference2 (corresponding to C point or E point), and the strong and weak difference value S_Light_Diff with present sensing signal compares with reference to value, produces difference S_error.According to difference S_error, filtration module 530 will produce a filtering result.Then, 540 pairs of this filtering of integration module result carries out an Integral Processing to produce an integral result.Afterwards, slope modular converter 550 will carry out the slope conversion to this integral result, drive the signal compensation value to produce one, wherein the slope conversion is carried out based on the slope (or other parallel segment) of line segment AB, reason is, the difference S_error that is produced by difference calculating module 520 is corresponding to the numerical difference between on the Y-axis of Fig. 3, poor between the strong and weak difference value namely, if will produce according to this difference the gain compensation value of light-emitting component 400, then this difference must be converted to the numerical difference between on the X-axis.At last, drive signal adjusting module 560 and can adjust the intensity that drives signal S_Drv according to this driving signal compensation value.Running by above circuit, when the strong and weak difference value (S_reference1 or S_reference2) of reference during greater than present strong and weak difference value (S_Light_Diff), the adjusting module 570 that is then formed by above circuit, can be by getting a succession of processes such as difference, filtering, integration, increase the intensity level that drives signal S_Drv, otherwise adjusting module 570 downgrades the intensity level of this driving signal.In the desirable setting of parameter (for example: under the situation time constant of filtration module or integration module), the intensity level that drives signal S_Drv can stably be maintained at reference value S_reference1 or the corresponding intensity level C of S_reference2 or E.The intensity level that adjusting module 570 will drive signal S_Drv that is to say, in case when corresponding strong and weak difference value is adjusted front strong and weak difference value less than drive signal strength after the adjustment of discovery drive signal strength, will retract present reference value.And in the strong and weak difference value of the strong and weak difference value of the sensing signal after adjustment before adjusting greater than drive signal strength, then continue to increase the intensity level of driving signal S_Drv.
In some cases, if the reference value of difference calculating module 520 is selected in the respective value S_reference3 of P value institute, and present strong and weak difference value is S_reference2, then according to above-described adjustment mechanism, the intensity level that drives signal S_Drv will be toward the right-hand increase of X-axis, continue according to this trend, then calculating present strong and weak difference value (S_Light_Diff) will continuous decrease, so that it is forever less than reference value S_reference3, thus, just can't reach the originally effect of stable control light-emitting component.Occur for fear of such situation, therefore, if drive signal adjusting module 560 receive for several times by on the occasion of driving signal compensation value (being produced by slope modular converter 550), can assert that the intensity level of present driving signal S_Drv is P this moment, and downgrade the intensity level that drives signal S_Drv, it can see through and a negative circuit is set in driving signal adjusting module 560 processes and drive the signal compensation value and reach.Note that above control device 500 can software, software adds hardware, or simple hardware structure implements, and more than changes all to belong to category of the present invention.
The invention has the advantages that the problem of aging that to avoid noise jamming or light-emitting component itself.As shown in Figure 5, if when light-emitting component has aging phenomenon, strong and weak difference value can be offset the functional relation of upper drive signal strength value.At this moment, the better operating point of light-emitting component will be obtained difficult, but by mechanism of the present invention, still can be effectively the intensity level of the driving signal of light-emitting component be maintained the position of a relative ideal.
One embodiment of the invention provide a kind of control method for the edge detection device, and the embodiment of the method please refer to Fig. 6, and it is a flow chart.As shown in the figure, the inventive method includes: step 610: determine one first strong and weak difference value corresponding to the strong and weak difference of this sensing signal; Step 620: adjust this driving signal, and determine one second strong and weak difference value of the driving signal after this sensing signal is based on this adjustment; Step 630: relatively this first strong and weak difference value and this second strong and weak difference value are to produce a comparative result; And step 640: adjust this driving signal according to this comparative result.Because above step in previous explanation, is not given unnecessary details in addition at this.
In sum, control device of the present invention and control method can be kept the output light intensity of the light-emitting component in the edge device device effectively, guarantee the quality of sensing signal, improve the correctness of edge detection.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (16)
1. control method that is used for an edge arrangement for detecting, wherein this edge detection device comprises a light-emitting component, and receives this light-emitting component and drive the output light that signal produces based on one and produce a sensing signal, and the method comprises:
Decision is corresponding to one first strong and weak difference value of the strong and weak difference of this sensing signal;
Adjust this driving signal, and determine one second strong and weak difference value of the driving signal after this sensing signal is based on this adjustment;
Relatively this first strong and weak difference value and this second strong and weak difference value are to produce a comparative result; And
Adjust this driving signal according to this comparative result.
2. control method as claimed in claim 1 wherein comprises according to the step that this comparative result is adjusted this driving signal:
When this comparative result is pointed out this first strong and weak difference value less than this second strong and weak difference value, increase the intensity level of this driving signal; And
When this comparative result is pointed out this first strong and weak difference value greater than this second strong and weak difference value, downgrade the intensity level of this driving signal.
3. control method as claimed in claim 1 wherein comprises according to the step that this comparative result is adjusted this driving signal:
When this comparative result is pointed out this first strong and weak difference value greater than this second strong and weak difference value, increase the intensity level of this driving signal; And
When this comparative result is pointed out this first strong and weak difference value less than this second strong and weak difference value, downgrade the intensity level of this driving signal.
4. control method as claimed in claim 1 wherein comprises according to the step that this comparative result is adjusted this driving signal:
When this comparative result is pointed out this first strong and weak difference value greater than this second strong and weak difference value, increase the intensity level of this driving signal; And
If this driving signal after increasing is still so that this comparative result when continuing to point out this first strong and weak difference value greater than this second strong and weak difference value, downgrades the intensity level of this driving signal.
5. control method as claimed in claim 1, wherein adjust the step that drives signal according to this comparative result and comprise:
Calculate the difference between this first signal strength difference value and this secondary signal strength difference value;
This difference is carried out a filtering process to produce a filtering result;
This filtering result is carried out an Integral Processing to produce an integral result; And
Adjust this driving signal according to this integral result rice.
6. control method as claimed in claim 5 wherein comprises according to the step that this integral result is adjusted this driving signal:
This integral result is carried out a slope conversion produce a driving signal compensation value; And
Adjust this driving signal according to driving the signal compensation value;
Wherein this slope conversion is carried out corresponding to the relation before and after this driving signal adjustment according to this first strong and weak difference value and this second strong and weak difference value.
7. control method as claimed in claim 1 determines that wherein the step of this first strong and weak difference value comprises:
Determine the mean value of this sensing signal in a special time;
Determine a maximum of this sensing signal; And
Decide the strong and weak difference value of this first signal according to this mean value and this maximum.
8. control method as claimed in claim 1 determines that wherein the step of this second strong and weak difference value comprises:
Determine the mean value of this sensing signal in a special time;
Determine a maximum of this sensing signal; And
Decide this second strong and weak difference value according to this mean value and this maximum.
9. control device that is used for an edge arrangement for detecting, wherein this edge detection device comprises a light-emitting component, and receives this light-emitting component and drive the output light that signal produces based on one and produce a sensing signal, and this control device comprises:
One adjusting module is in order to adjust this driving signal;
One sensing signal intensity detecting module is in order to determine one first strong and weak difference value corresponding to the strong and weak difference of this sensing signal; And determine that this sensing signal adjusts corresponding one second strong and weak difference value behind this driving signal based on this adjusting module; And
One difference calculating module is coupled to this sensing signal intensity detecting module, in order to relatively this first strong and weak difference value and this second strong and weak difference value to produce a comparative result;
Wherein this adjusting module is adjusted this driving signal again according to this comparative result.
10. control device as claimed in claim 9, wherein:
When this comparative result was pointed out this first strong and weak difference value less than this second strong and weak difference value, this adjusting module increased the intensity level of this driving signal; And
When this comparative result was pointed out this first strong and weak difference value greater than this second strong and weak difference value, adjusting module downgraded the intensity level of this driving signal.
11. control device as claimed in claim 9, wherein:
When this comparative result was pointed out this first strong and weak difference value greater than this second strong and weak difference value, this adjusting module increased the intensity level of this driving signal; And
When this comparative result was pointed out this first strong and weak difference value less than this second strong and weak difference value, this adjusting module downgraded the intensity level of this driving signal.
12. control device as claimed in claim 9 wherein comprises according to the step that this comparative result is adjusted this driving signal:
When this comparative result was pointed out this first strong and weak difference value greater than this second strong and weak difference value, this adjusting module increased the intensity level of this driving signal; And
If this driving signal after increasing is still so that this comparative result when continuing to point out this first strong and weak difference value greater than this second strong and weak difference value, this adjusting module downgrades the intensity level of this driving signal.
13. control device as claimed in claim 9 wherein comprises according to this adjusting module:
One difference calculating module is in order to calculate the difference between this first signal strength difference value and this secondary signal strength difference value;
One filtration module is coupled to this difference calculating module, processes to produce a filtering result in order to this difference is carried out a filtering;
One integration module is coupled to this filtration module, in order to this filtering result is carried out an Integral Processing to produce an integral result; And
One drives signal adjusting module, is coupled to this integration module, in order to adjust this driving signal according to this integral result.
14. control device as claimed in claim 13, wherein this adjusting module comprises in addition:
One slope modular converter, be coupled between this integration module and this driving signal adjusting module, produce a driving signal compensation value in order to this integral result is carried out a slope conversion, wherein this driving signal adjusting module is adjusted this driving signal according to driving the signal compensation value;
Wherein this slope modular converter carries out this slope conversion according to this first strong and weak difference value and this second strong and weak difference value corresponding to the relation before and after this driving signal adjustment.
15. control device as claimed in claim 9, wherein this sensing signal intensity detecting module:
Determine the mean value of this sensing signal in a special time;
Determine a maximum of this sensing signal; And
Decide the strong and weak difference value of this first signal according to this mean value and this maximum.
16. control device as claimed in claim 9, wherein sensing signal intensity detecting module:
Determine the mean value of this sensing signal in a special time;
Determine a maximum of this sensing signal; And
Decide this second strong and weak difference value according to this mean value and this maximum.
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| EP0015553A1 (en) * | 1979-03-07 | 1980-09-17 | Vydec, Inc. | Method and apparatus for determining the position of the printing medium in a high speed printer |
| US4727399A (en) * | 1984-11-01 | 1988-02-23 | Fuji Photo Film Co., Ltd. | Photographic printer and method for detecting and positioning frames |
| US5564846A (en) * | 1994-06-28 | 1996-10-15 | Kabushiki Kaisha Tec | Printer with sheet positioning marks control |
| US5803635A (en) * | 1995-05-04 | 1998-09-08 | Intermec Corporation | Method and apparatus to determine position and sense motion of linerless media |
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Application publication date: 20130424 |