CN104044340A - Optical detecting element, mark sensor and mark judgment method of optical detecting element - Google Patents
Optical detecting element, mark sensor and mark judgment method of optical detecting element Download PDFInfo
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- CN104044340A CN104044340A CN201410076976.7A CN201410076976A CN104044340A CN 104044340 A CN104044340 A CN 104044340A CN 201410076976 A CN201410076976 A CN 201410076976A CN 104044340 A CN104044340 A CN 104044340A
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- mark
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- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
The invention provides an optical detecting element, a mark sensor and a mark judgment method based on the optical detecting element. The optical detecting element is capable of easily producing intensity differences of output signals of all light after receiving light of differently distributed intensity of wavelengths. The optical detecting element is provided with a light receiving element (31) with multiple photo-translating areas (32a-32c) with different spectrum sensitivity characteristics, an external terminal (39) used for outwardly outputting signals of the multiple photo-translating areas (32a-32c) and multiple switches (SW1-SW3) arranged on pathes (41a-41c) connected among the multiple photo-translating areas (32a-32c) and the external terminal (39).
Description
The application advocates the priority of No. 2013-049478th, Japanese patent application based on March 12nd, 2013 application.All the elements of this Japanese patent application are by reference to being applied in this description.
Technical field
The present invention relates to a kind of by the light receiving be converted to the signal of telecommunication photodetector, utilize the mark sensor of this element and the mark decision method based on photodetector.
Background technology
When being undertaken by colored printing system in the situation of colored printing, on the cylinder material such as paper, film, the mark of printing regulation, detects this mark by mark sensor, controls the skew that results from the printing position between each plate cylinder according to testing result.
Generally, mark sensor possesses the light source of cylinder material light irradiation and receives from the reverberation of cylinder material and the photodiode of output signal.When to cylinder material light irradiation, conventionally, there are differences between substrate and mark with respect to the intensity distribution (following, to be called Wavelength strength and to distribute) of reverberation wavelength, this difference table is shown the intensity difference of the output signal of photodiode.Output signal and the defined threshold of mark sensor to photodiode compares and is determined with unmarked (for example, referring to Patent Document 1).
Patent documentation 1: Japanese kokai publication hei 05-016337 communique
Mark sensor distributes the different light time receiving Wavelength strength, and the intensity difference of the output signal of the each light based on photodiode is the bigger the better.Thus, output signal is diminished by the impact of noise, can be determined with accurately unmarked.The present inventor recognizes about the structure that can realize this requirement and still has room for improvement.
Summary of the invention
The present invention completes in light of this situation, and its object is to provide a kind of can make the output signal of each light produce photodetector, mark sensor and the mark decision method based on photodetector of intensity difference receiving Wavelength strength different light time that distributes simply.
A certain mode of the present invention relates to a kind of photodetector.Photodetector possesses: photo detector, has multiple photoelectric conversion regions that spectral sensitivity characteristic is different; Outside terminal, exports the signal from multiple each photoelectric conversion regions respectively to outside; And multiple switches, be arranged on each path connecting between multiple photoelectric conversion regions and outside terminal.
And a certain mode of the present invention relates to a kind of mark sensor.Mark sensor possesses: light source, to cylinder material light irradiation; Photodetector, has the photo detector receiving from the light of cylinder material; And mark detection unit, according to being determined with without the mark that is arranged at cylinder material from the signal of photodetector output.Photodetector uses the element of above-mentioned form.
And a certain mode of the present invention relates to a kind of mark decision method based on photodetector.Mark decision method comprises the steps: the scope internal radiation light that the mark to being arranged on the cylinder material in moving passes through, and receives the light from cylinder material by the photo detector of photodetector, from the step of outside terminal output signal; And judge whether the signal strength signal intensity of exporting from outside terminal exceedes the step of defined threshold, in the situation that signal strength signal intensity does not exceed defined threshold, switch conducting and the disconnection of multiple switches, again repeat the step of output signal and determine whether the step that exceedes defined threshold.Photodetector uses the element of above-mentioned form.
According to the photodetector of a certain mode of the present invention, distribute the different light time receiving Wavelength strength, can make simply the output signal of each light produce intensity difference.
Brief description of the drawings
Fig. 1 is the figure that represents the structure of the colored printing system that uses the related mark sensor of present embodiment.
Fig. 2 is the figure that represents the structure of the mark sensor that uses the related photodetector of present embodiment.
Fig. 3 is the circuit diagram that represents the structure of the related photodetector of present embodiment.
Fig. 4 is the figure that represents the spectral sensitivity characteristic of the related photo detector of present embodiment.
Fig. 5 represents that multiple switches are in the time of a kind of conducting off-state, the figure that the intensity of reflected light of the spectral sensitivity characteristic of photodetector and mark and substrate distributes.
Fig. 6 represents that multiple switches are in the time of another kind of conducting off-state, the figure that the intensity of reflected light of the spectral sensitivity characteristic of photodetector and mark and substrate distributes.
Fig. 7 is the flow chart that represents the mark decision method of the photodetector related based on present embodiment.
In figure: 10-mark sensor, 30-photodetector, 31-photo detector, SW1～SW3-switch, 37-add circuit, 50-cylinder material.
Detailed description of the invention
Fig. 1 is the figure that represents the structure of the colored printing system 60 that uses the related mark sensor of present embodiment 10.
Colored printing system 60 possesses multiple printing elements 61 and control device 71.Printing element 61 possesses plate cylinder 63, impression cylinder 65 and mark sensor 10.Cylinder material 50 is directed along the mobile route of regulation by guide roller 67, and by plate cylinder 63 and impression cylinder 65, prints the pattern with plate cylinder 63 corresponding color.On cylinder material 50, be printed with regulation mark by plate cylinder 63, this mark is detected by mark sensor 10.Control device 71 is judged the skew in the printing position producing between each plate cylinder 63 according to the testing result of mark sensor 10.In the case of the skew that has printing position, control device 71 makes the amount of spin of plate cylinder 63 increase and decrease to eliminate this skew.
Fig. 2 represents the structure of mark sensor 10.Mark sensor 10 possesses light source 11, photodetector 30 and mark detection unit 73.Light source 11 is white light source.The irradiation penetrating from light source 11 is in cylinder material 50.The reflection of light light irradiating on cylinder material 50, receives by the photo detector 31 of photodetector 30 after by optically focused by known optical system 13.
Fig. 3 represents the circuit structure of photodetector 30.Photodetector 30 possesses photo detector 31, current-to-voltage converting circuit 33a～33c, amplifying circuit 35a～35c, switch SW 1～SW3, add circuit 37 and outside terminal 39.
Photo detector 31 is rgb light electric diode.Photo detector 31 has multiple photoelectric conversion regions 32a～32c.Fig. 4 represents the spectral sensitivity characteristic of photo detector 31.Spectral sensitivity characteristic Sa～Sc of each region 32a～32c differs from one another.The 1st region 32a has the characteristic Sa at red wave band with peak wavelength λ R, and the 2nd region 32b has the characteristic Sb at green wave band with peak wavelength λ G, and the 3rd region 32c has the characteristic Sc at blue wave band with peak wavelength λ B.The cathode side ground connection of each region 32a～32c, converts the light receiving to current signal anode side output afterwards.This current signal is by the light intensity receiving (W) and is subject to the product value of luminous sensitivity (A/W) to carry out the size of integration gained according to each wavelength.
Turn back to Fig. 3, between the 1st region 32a, the 2nd region 32b and the 3rd region 32c and outside terminal 39, be respectively equipped with the 1st path 41a, the 2nd path 41b and the 3rd path 41c.On the 1st path 41a, be provided with the 1st current-to-voltage converting circuit 33a, the 1st amplifying circuit 35a and the 1st switch SW 1.On the 2nd path 41b, be provided with the 2nd current-to-voltage converting circuit 33b, the 2nd amplifying circuit 35b and the 2nd switch SW 2.On the 3rd path 41c, be provided with the 3rd current-to-voltage converting circuit 33c, the 3rd amplifying circuit 35c and the 3rd switch SW 3.
Current-to-voltage converting circuit 33a～33c exports by be converted to voltage signal from the current signal of each photoelectric conversion regions 32a～32c after.Output after amplifying circuit 35a～35c amplifies the voltage signal from each current-to-voltage converting circuit 33a～33c.Amplifying circuit 35a～35c amplifies each path 41a～41c with identical ratio, so that the signal processing of being undertaken by mark detection unit 73 becomes easy.
Switch SW 1～SW3 switches the having or not of electrical connection of each path 41a～41c.Although switch SW 1～SW3 in conducting with can manual switchover between disconnecting, also can carry out switching controls by mark detection unit 73.
Add circuit 37 carries out exporting after add operation to the voltage signal of the amplifying circuit 35a～35c from each path 41a～41c.Outside terminal 39 is exported the signal from add circuit 37 to outside mark detection unit 73.
According to above photodetector 30, by conducting and the disconnection of change-over switch SW1～SW3, only have the signal of specific photoelectric conversion regions 32a～32c to export to mark detection unit 73 from outside terminal 39.For example, when making the 1st switch SW 1 conducting, when the 2nd switch SW 2 and the 3rd switch SW 3 are disconnected, only export the signal of the 1st region 32a.When making the 1st switch SW 1 and the 2nd switch SW 2 conductings, when the 3rd switch SW 3 is disconnected, the signal of the 1st region 32a, the 2nd region 32b is undertaken being output after add operation by add circuit 37.
Mark detection unit 73 is contained in control device 71.The formation of the hardware of mark detection unit 73 is realized by CPU, memory and other LSI of any computer.Mark detection unit 73 is determined with the mark without cylinder material 50 according to the signal of exporting from photodetector 30.This processing is carried out as follows, sets defined threshold, and the signal strength signal intensity of exporting from photodetector 30 and threshold value are compared, and is determined with mark in the time that signal strength signal intensity exceedes threshold value.
Fig. 5 represents that the spectral sensitivity characteristic of photodetector 30 and the intensity of reflected light of mark and substrate distribute.The figure shows and make the 2nd switch SW 2 conductings, spectral sensitivity characteristic when the 1st switch SW 1 and the 3rd switch SW 3 are disconnected.Only export the signal of the 2nd region 32b from photodetector 30.And, represent the catoptrical Wavelength strength distribution Sn of substrate and the catoptrical Wavelength strength distribution Sm of mark with double dot dash line.The peak wavelength of these Wavelength strength distributions Sn, Sm is from the peak wavelength of the spectral sensitivity characteristic Sb of the 2nd region 32b roughly the same distance of being separated by, and intensity distribution is roughly the same.Now, the output of photodetector 30 with by the light intensity receiving be subject to the product value of luminous sensitivity to carry out being in proportion of integration gained according to each wavelength, therefore on substrate and mark, be difficult to the intensity difference of generating output signal.
Fig. 6 represents to make switch SW 1 conducting of photodetector 30, spectral sensitivity characteristic when switch SW 2, SW3 are disconnected.Only export the signal of the 1st region 32a from photodetector 30.Compared with the Wavelength strength distribution Sn of substrate, the peak wavelength of the Wavelength strength distribution Sm of mark more approaches the peak wavelength of the spectral sensitivity characteristic Sa of the 1st region 32a.Now, compared with substrate, the output of the photodetector 30 of mark one side is larger, and it is large that the intensity difference of the output signal of substrate and mark becomes.
Fig. 7 represents the flow chart of the mark decision method based on photodetector 30.Operating personnel or mark detection unit 73 only make switch SW 1 conducting of photodetector 30.The scope internal radiation light that light source 11 passes through the mark of cylinder material 50.Photodetector 30 receives the light from cylinder material 50 by photo detector 31, from outside terminal 39 to mark detection unit 73 output signals (S12).Mark detection unit 73 judges whether exported signal strength signal intensity exceedes defined threshold (S14).In this step S12, S14, also can measure and start to be subject to institute's elapsed time after light, and through after the stipulated time, judge whether the output signal storing in this time exceedes threshold value.
As (N of S14) in the situation that does not exceed defined threshold, operating personnel or mark detection unit 73 only switch to switch SW 2 conducting (S16), again repeat the step S12 of output signal and determine whether the step S14 that exceedes defined threshold.In the situation that not exceeding defined threshold, only switch SW 3 is switched to conducting, repeating step S12, S14 and end process.Also end process (Y of S14) in the situation that exceeding defined threshold.
The photodetector 30 related according to present embodiment, distributes the different light time when receiving Wavelength strength, only just can make simply the output signal of each light produce intensity difference by conducting and the disconnection of change-over switch SW1～SW3.Thus, mark sensor 10 can be determined with unmarked accurately.And, owing to add circuit 37, the signal from each photoelectric conversion regions 32a～32c being carried out exporting to outside terminal 39 after add operation, therefore without in outside, signal being carried out to add operation for mark determination processing, can make external structure densification.
The mark decision method related according to present embodiment, can set the switch SW 1～SW3 in order to judge that accurately regulation mark is required.Especially, if carry out the switching controls of switch SW 1～SW3 by mark detection unit 73, can automatically carry out this setting, reduce operating personnel's homework burden.
In addition, as making output signal produce the method for intensity difference, for example, can consider following method on substrate and mark, use and differently send out multiple light sources spectral, and toggle lights and make catoptrical Wavelength strength changes in distribution.If compare with the method, the related photodetector 30 of present embodiment, without multiple light sources are set, can be simplified the hardware configuration of the optical system that includes mark sensor 10, and having advantages of can be with low cost fabrication photodetector 30.
Above, according to embodiment, the present invention has been described, but embodiment only represents Principle and application of the present invention.And, in embodiment, in the scope of the thought of the present invention specifying, can carry out the change of various deformation example and configuration in not departing from claim.
In the above-described embodiment, the photo detector 31 with 3 photoelectric conversion regions 32a～32c has been described, but, the quantity of this photoelectric conversion regions as long as 2 above.And photo detector 31 can not be also rgb light electric diode.And, also can not carry out add operation by add circuit 37 and export from outside terminal 39 from the signal of each photoelectric conversion regions 32a～32c.In this case, for mark determination processing, at outside mark detection unit 73, the signal from each photoelectric conversion regions 32a～32c is carried out to add operation.Mark sensor 10 is except receiving by photodetector 30 reverberation of cylinder material 50, also can be by receiving the transmitted light of transparent cylinder material 50 certification mark.
And, in above-mentioned mark decision method, according to only make in switch SW 1～SW3 a conducting time signal exported determine whether and exceed defined threshold, but, also can according to make in switch SW 1～SW3 more than two conducting time signal judge.
And, in above-mentioned mark decision method, also can make all switch SW 1～SW3 conducting, distribute different light also do not produce intensity difference in output signal in the situation that even if receive Wavelength strength, carry out each step S12～S16.Thus, can be used as the photodetector 30 in wider wavelength range with sensitivity and use, and distribute the different light time receiving Wavelength strength, can make stable output signal real estate green strength poor.
Claims (4)
1. a photodetector, it for the mark sensor of colored printing system, is characterized in that, possesses:
Photo detector, has multiple photoelectric conversion regions that spectral sensitivity characteristic is different;
Outside terminal, exports the signal from described multiple photoelectric conversion regions respectively to outside; And
Multiple switches, are arranged on each path connecting between described multiple photoelectric conversion regions and described outside terminal.
2. photodetector according to claim 1, is characterized in that,
Also possess add circuit, it is arranged between described multiple switch and described outside terminal, and the signal from described multiple each photoelectric conversion regions is respectively carried out to add operation.
3. a mark sensor, is characterized in that, possesses:
Light source, to cylinder material light irradiation;
Photodetector described in claim 1 or 2, has the photo detector receiving from the light of described cylinder material, and
Mark detection unit, according to being determined with without the mark that is arranged at cylinder material from the signal of described photodetector output.
4. the mark decision method based on photodetector, is characterized in that, comprising:
The scope internal radiation light that the mark being arranged on the cylinder material in moving is passed through, and receive the light from cylinder material by the photo detector of the photodetector described in claim 1 or 2, from the step of described outside terminal output signal; And
Judge the step that whether exceedes defined threshold from the signal strength signal intensity of described outside terminal output,
In the situation that described signal strength signal intensity does not exceed defined threshold, switch conducting and the disconnection of described multiple switches, again repeat to export the step of described signal and determine whether the step that exceedes described defined threshold.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013049478A JP6292759B2 (en) | 2013-03-12 | 2013-03-12 | Mark sensor and mark determination method using light detection element |
| JP2013-049478 | 2013-03-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104044340A true CN104044340A (en) | 2014-09-17 |
| CN104044340B CN104044340B (en) | 2017-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410076976.7A Active CN104044340B (en) | 2013-03-12 | 2014-03-04 | Photodetector, mark sensor and mark decision method |
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| Country | Link |
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| JP (1) | JP6292759B2 (en) |
| CN (1) | CN104044340B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107175908A (en) * | 2016-03-11 | 2017-09-19 | 住友重机械工业株式会社 | Sensor, the detection method for being directed at control unit, polychrome printing system and alignment mark |
| CN108181880A (en) * | 2016-12-08 | 2018-06-19 | 株式会社捷太格特 | Optical detection device and equipment management system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6548909B2 (en) * | 2015-02-25 | 2019-07-24 | 住友重機械工業株式会社 | Registration control unit, multi-color printing system including the registration control unit, and method of detecting a registration mark |
| JP6887404B2 (en) | 2018-07-13 | 2021-06-16 | ミネベアミツミ株式会社 | motor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107175908A (en) * | 2016-03-11 | 2017-09-19 | 住友重机械工业株式会社 | Sensor, the detection method for being directed at control unit, polychrome printing system and alignment mark |
| CN107175908B (en) * | 2016-03-11 | 2019-12-10 | 住友重机械工业株式会社 | sensor, alignment control unit, multicolor printing system, and method for detecting alignment mark |
| CN108181880A (en) * | 2016-12-08 | 2018-06-19 | 株式会社捷太格特 | Optical detection device and equipment management system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104044340B (en) | 2017-12-05 |
| JP6292759B2 (en) | 2018-03-14 |
| JP2014172359A (en) | 2014-09-22 |
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