CN103945084A - Contact type image sensor and scanning method thereof - Google Patents
Contact type image sensor and scanning method thereof Download PDFInfo
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- CN103945084A CN103945084A CN201410159767.9A CN201410159767A CN103945084A CN 103945084 A CN103945084 A CN 103945084A CN 201410159767 A CN201410159767 A CN 201410159767A CN 103945084 A CN103945084 A CN 103945084A
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Abstract
The invention relates to a contact type image sensor and a scanning method of the contact type image sensor. The contact type image sensor is characterized by comprising three sets of phototonus sensors and a control module. The three sets of phototonus sensors are arranged below cylindrical lens sets, the distances between the phototonus sensors and the cylindrical lens sets in the scanning direction are larger than or equal to 0.3 mm, and the phototonus sensors and the cylindrical lens sets are connected with a photosensitive circuit, so that after each pixel passes through the three sets of phototonus sensors in the image scanning process, the photosensitive circuit outputs three sets of electrical signals respectively; the control module conducts comparison on every two sets of the three sets of electrical signals of the same pixel, and the average value of the two sets of electrical signals of the smallest difference is obtained to serve as the final output electrical signal of the pixel. By means of the contact type image sensor and the scanning method of the contact type image sensor, unusual influences of dust and dirty points on the phototonus sensors on the quality of the scanned images can be effectively avoided.
Description
Technical field
The present invention relates to a kind of contact-type image sensor and scan method thereof, relate in particular to a kind of contact-type image sensor and scan method thereof of keeping away dirty point, dust.
Background technology
?in paper feeding scanner or paper currency sorter, the use of contact-type image sensor CIS (Contact Image Sensor) is more and more, image quality is more and more focused on simultaneously, and image quality can have influence on the discrimination of scanning thing.Yet in the application of these equipment, dust and dirty point that paper or coin take in board are maximum problems always, and dust and dirty point can cover photoinduction transducer.In traditional C IS, generally comprise setting LED light-guiding pillar, LED light source, lens pillar group (Rod Lens), glass, photoinduction transducer and photosensitive circuit plate in the enclosure, make LED light-guiding pillar by described LED light source by glass be irradiated to scanned on, and reflex in lens pillar group, by photoinduction transducer and photoinduction circuit, produce signal of telecommunication output image information.Be used in scanner, by photosensitive unit close-packed arrays, directly collect the light information that is scanned contribution reflection, because itself is cheap, again without set of lenses, so can produce the scanner that structure is more compact, cost also reduces greatly, but owing to reading image with wall scroll photoinduction transducer, in the use of paper feeding scanner or paper currency sorter, because being in operation, paper or coin can drive a large amount of dust and dirty point, when dust and dirty point drop on certain photoinduction transducer of CIS, will cause the image of scanning to produce abnormal lines or point.
Summary of the invention
The object of the present invention is to provide a kind of contact-type image sensor and scan method thereof, to avoid dust on photoinduction transducer and dirty quality of scanned image to be produced to anomalous effects.
In order to address the above problem, the present invention relates to a kind of contact-type image sensor, comprise shell, glass, LED light-guiding pillar, LED light source, lens pillar group and photosensitive circuit, glass is arranged on cover top portion, in the enclosure, described LED light-guiding pillar by described LED light source from described glass be irradiated to scanned, reflex to again in lens pillar group, it is characterized in that three groups of photoinduction transducers that also comprise control module and be arranged at described lens pillar group below
Described three groups of photoinduction transducers are all more than or equal to 0.3mm along the distance of scanning direction each other, and all connect described photosensitive circuit, while making scan-image each pixel by described three groups of photoinduction transducers after, described photosensitive circuit is exported respectively three groups of signals of telecommunication;
Described control module, contrasts between two to three of same pixel groups of signals of telecommunication, obtains the signal of telecommunication that wherein mean value of two groups of signals of telecommunication of difference minimum is finally exported as this pixel.
Preferably, described three groups of photoinduction transducers are all more than or equal to 0.5mm along the distance of scanning direction each other.
Preferably, one group of lens pillar group is being set above described three groups of photoinduction transducers or above described three groups of photoinduction transducers, one group of lens pillar group is being set respectively.
Preferably, described control module connects a connector joint, sends the signal of telecommunication of the scan-image of finally exporting to external equipment.
Preferably, described photosensitive circuit is a PCB photosensitive circuit plate, and described photosensitive circuit is a PCB circuit board, and described three groups of photoinduction transducers and described control module are all fixed on described PCB circuit board.
Preferably, described three groups of photoinduction sensor settings are at described PCB photosensitive circuit plate upper surface, and described control module is arranged on the lower surface of described PCB photosensitive circuit plate.
In order to address the above problem, the invention still further relates to a kind of scan method of contact type image, comprise the following steps:
S1: the mutual distance along scanning direction is set in a contact-type image sensor and is more than or equal to tri-groups of photoinduction transducers of 0.3mm;
S2: scan-image, make each pixel respectively after three groups of photoinduction transducers, by photosensitive circuit, obtain three groups of signals of telecommunication;
S3: contrast between two three groups of signals of telecommunication of same pixel, obtain the mean value of two groups of signals of telecommunication of difference minimum as the signal of telecommunication of the final output of this pixel.
Preferably, between photoinduction transducer, the distance along scanning direction is all more than or equal to 0.5mm.
Preferably, also comprise by a connector joint and send the signal of telecommunication of the scan-image of finally exporting to external equipment.
Preferably, three groups of signal of telecommunication a, b, c that in S3, same pixel obtains process by signal processing chip, obtain ABS(a/b-1), ABS(b/c-1) and ABS(a/c-1) in minimum value in the mean value of two groups of signals of telecommunication as the signal of telecommunication of the final output of this pixel.
The present invention, owing to adopting above technical scheme, compared with prior art, has following advantage and good effect:
The present invention is provided with three groups of photoinduction transducers, along the distance of scanning direction, be all greater than each other the diameter of general dust and dirty point, dust and dirty point can only impact one group of photoinduction transducer, by control module, calculate, effectively avoided quality of scanned image to produce abnormal impact;
Adopt PCB photosensitive circuit plate, three groups of photoinduction sensor settings are at PCB photosensitive circuit plate upper surface, and control module is arranged on the lower surface of PCB photosensitive circuit plate, make simple and compact for structurely, save space.
Accompanying drawing explanation
Fig. 1 is the profile of a kind of contact-type image sensor of the present invention;
Fig. 2 is to be the STRUCTURE DECOMPOSITION schematic diagram of a kind of contact-type image sensor of the present invention;
Fig. 3 is to be the local enlarged diagram of Fig. 2;
The surface structure schematic diagram of the PCB photosensitive circuit plate 9 of Fig. 4 embodiment of the present invention;
Fig. 5 is to be the lower surface configuration schematic diagram of the PCB photosensitive circuit plate 9 of the embodiment of the present invention;
Fig. 6 is the flow chart of a kind of contact type image scan method of the present invention.
Embodiment
Further illustrate the present invention with specific embodiment with reference to the accompanying drawings.
CIS generally includes the LED light-guiding pillar being arranged in a housing, lens pillar group, glass, photoinduction transducer, photosensitive circuit and adapter connector, a kind of contact-type image sensor provided by the invention, three groups of photoinduction transducers that comprise control module and be arranged at described lens pillar group below, three groups of spacing settings that photoinduction transducer is separated by fixing, and all connect photosensitive circuit, while making scan-image, each pixel is by after three groups of photoinduction transducers, photosensitive circuit obtains respectively three groups of signals of telecommunication, and three groups of photoinduction transducers are all more than or equal to 0.3mm along the distance of scanning direction each other, control module, contrasts three groups of signals of telecommunication of same pixel between two, obtains the mean value of two groups of signals of telecommunication of difference minimum wherein as the signal of telecommunication of the final output of this pixel.
The present invention is provided with three groups of photoinduction transducers, along the distance of scanning direction, be all greater than each other the diameter of general dust and dirty point, dust and dirty point can only impact one group of photoinduction transducer, by control module, calculate, effectively avoided quality of scanned image to produce abnormal impact.
In the present embodiment, as shown in Figure 1, comprise LED light-guiding pillar 1 is set, the first lens pillar group 2, the second lens pillar group 3, the three lens pillar groups 4, glass 5, the first photoinduction transducer 6, the second photoinduction transducers 7, the 3rd photoinduction transducer 8, PCB photosensitive circuit plate 9, adapter connector 10, shell 11, the one LED lamp source 12, the two LED lamp source 13 and control modules 14.
Shell 11 tops are the two ends that glass 5, the one LED lamp sources 12 and the 2nd LED lamp source 13 are separately positioned on PCB photosensitive circuit plate 9, are not limited to this, the one LED lamp source 12, the 2nd LED lamp source 13 and LED light-guiding pillar 1 are all arranged on glass 5 belows, the one LED lamp source 12 and the 2nd LED lamp source 13 lay respectively at LED light-guiding pillar 1 both sides, make along perpendicular to scanning direction, all have light source see through glass be irradiated to scanned on, and light source is by the scanned first lens pillar group 2 that is reflected into, in the second lens pillar group 3 and the 3rd lens pillar group 4, above three groups of photoinduction transducer 6-8, lens pillar group 2-4 is set respectively, can certainly above three groups of photoinduction transducers, share one group of lens pillar group, do not limit.The first photoinduction transducer 6, along scanning direction, the distance t of (as the direction of the arrow A marking in accompanying drawing 1-2) is all more than or equal to 0.3mm each other for the second photoinduction transducer 7 and the 3rd photoinduction transducer 8, in the present embodiment, t gets and is greater than 0.5mm, can thoroughly avoid dust that naked eyes can not obviously differentiate and the interference of dirty point.When thereby dust and dirty point drop on glass when blocking one of them camera lens and having influence on the signal of telecommunication that corresponding photoinduction transducer produces, because its diameter is less than the spacing of photoinduction transducer, thereby cannot affect again in other two groups of photoinduction transducers the signal of telecommunication for same pixel simultaneously.
When paper or coin etc. scanned when the CIS, light is sent in the one LED lamp source 12 and the 2nd LED lamp source 13, by LED light-guiding pillar 1 be irradiated to scanned on, after making after scanned object is reflective the photoinduction transducer 6-8 of 3 groups of strips by CIS, each pixel is successively by lens pillar group 1-3, and 9 outputs of PCB photosensitive circuit plate obtain three groups of signals of telecommunication of same pixel.
As shown in Fig. 4-5, three groups of photoinduction sensor settings are at PCB photosensitive circuit plate upper surface, and control module 14 and adapter connector are all arranged on the lower surface of PCB photosensitive circuit plate, and adapter connector is exposed outside shell, make simple and compact for structurely, save space.Control module 14 is generally a signal processing chip, and the signal of telecommunication that dissection process PCB photosensitive circuit plate obtains contrasts three groups of signals of telecommunication of same pixel between two, obtains the mean value of two groups of signals of telecommunication of difference minimum wherein as the signal of telecommunication of the final output of this pixel.
Control module connecting contact of connector 10, is generally FFC connector etc., sends the signal of telecommunication of the scan-image of finally exporting to external equipment, and external equipment, as scanning machine, printer, computer, memory, mobile terminal etc., does not limit.
The present invention relates to a kind of scan method of contact type image, flow chart as shown in Figure 6, below by this method being elaborated in conjunction with a kind of contact-type image sensor recited above, comprise the following steps:
S1: three groups of photoinduction transducers that are more than or equal to each other 0.3mm along the distance of scanning direction are set in a contact-type image sensor.
In the present embodiment, t gets and is greater than 0.5mm, can thoroughly avoid dust that naked eyes can not obviously differentiate and the interference of dirty point.When thereby it drops on glass when blocking one of them camera lens and having influence on corresponding photoinduction sensor electrical signal, because its diameter is less than the spacing of photoinduction transducer, thereby cannot affect again in other two groups of photoinduction transducers the signal of telecommunication for same pixel simultaneously.
S2: scan-image, make each pixel respectively through three groups of photoinduction transducers, by photosensitive circuit, obtain three groups of signals of telecommunication.
In the present embodiment, when paper or coin etc. scanned when the CIS, light is sent in the one LED lamp source 12 and the 2nd LED lamp source 13, by LED light-guiding pillar 1 be irradiated to scanned on, after making after scanned object is reflective the photoinduction transducer 6-8 of 3 groups of strips by CIS, each pixel is successively by lens pillar group 1-3, and 9 outputs of PCB photosensitive circuit plate obtain three groups of signals of telecommunication of unified pixel.
S3: contrast between two three groups of signals of telecommunication of same pixel, obtain the mean value of two groups of signals of telecommunication of difference minimum as the signal of telecommunication of the final output of this pixel.
Three groups of signal of telecommunication a, b, c that same pixel obtains process by control module 14, obtain ABS(a/b-1), ABS(b/c-1) and ABS(a/c-1) in minimum value in the mean value of two groups of signals of telecommunication as the signal of telecommunication V of the final output of this pixel.Control module 14 is generally signal processing chip.
Four kinds of possible selections are as follows:
1) work as ABS(a/b-1) hour, get the mean value of a and b;
2) work as ABS(b/c-1) hour, get the mean value of a and b;
3) work as ABS(a/c-1) hour, get the mean value of a and c;
4), when a=b=c, get any value in a, b, c.
By above-mentioned signal processing, can be easy to draw optimum image output electrical signals, computational speed is fast, and owing to having set up three groups of photoinduction transducers, result accuracy is high, has effectively avoided dust on photoinduction transducer and dirty quality of scanned image has been produced to anomalous effects.
S4: send the signal of telecommunication of the scan-image of finally exporting to external equipment by a connector joint.In the present embodiment, control module 14 connecting contact of connectors 10, are generally FFC connector etc., send the signal of telecommunication of the scan-image of finally exporting to external equipment, external equipment, as scanning machine, printer, computer, memory, mobile terminal etc., does not limit.
Above-mentioned disclosed be only specific embodiments of the invention, this embodiment is only that clearer explanation the present invention is used, and limitation of the invention not, the changes that any person skilled in the art can think of, all should drop in protection range.
Claims (10)
1. a contact-type image sensor, comprise shell, glass, LED light-guiding pillar, LED light source, lens pillar group and photosensitive circuit, glass is arranged on cover top portion, in the enclosure, described LED light-guiding pillar by described LED light source from described glass be irradiated to scanned, then reflex in lens pillar group, it is characterized in that, three groups of photoinduction transducers that also comprise control module and be arranged at described lens pillar group below
Described three groups of photoinduction transducers are all more than or equal to 0.3mm along the distance of scanning direction each other, and all connect described photosensitive circuit, while making scan-image each pixel by described three groups of photoinduction transducers after, described photosensitive circuit is exported respectively three groups of signals of telecommunication;
Described control module, contrasts between two to three of same pixel groups of signals of telecommunication, obtains the signal of telecommunication that wherein mean value of two groups of signals of telecommunication of difference minimum is finally exported as this pixel.
2. a kind of contact-type image sensor as claimed in claim 1, is characterized in that, described three groups of photoinduction transducers are all more than or equal to 0.5mm along the distance of scanning direction each other.
3. a kind of contact-type image sensor as claimed in claim 1, is characterized in that, one group of lens pillar group is being set above described three groups of photoinduction transducers or above described three groups of photoinduction transducers, one group of lens pillar group is being set respectively.
4. a kind of contact-type image sensor as claimed in claim 1, is characterized in that, described control module connects a connector joint, sends the signal of telecommunication of the scan-image of finally exporting to external equipment.
5. a kind of contact-type image sensor as claimed in claim 1, is characterized in that, described photosensitive circuit is a PCB circuit board, and described three groups of photoinduction transducers and described control module are all fixed on described PCB circuit board.
6. a kind of contact-type image sensor as claimed in claim 5, is characterized in that, described three groups of photoinduction sensor settings are at described PCB photosensitive circuit plate upper surface, and described control module is arranged on the lower surface of described PCB photosensitive circuit plate.
7. a scan method for contact type image, is characterized in that, comprises the following steps:
S1: the mutual distance along scanning direction is set in a contact-type image sensor and is more than or equal to tri-groups of photoinduction transducers of 0.3mm;
S2: scan-image, make each pixel respectively after three groups of photoinduction transducers, by photosensitive circuit, obtain three groups of signals of telecommunication;
S3: contrast between two three groups of signals of telecommunication of same pixel, obtain the mean value of two groups of signals of telecommunication of difference minimum as the signal of telecommunication of the final output of this pixel.
8. the scan method of a kind of contact type image as claimed in claim 7, is characterized in that,
Distance along scanning direction between photoinduction transducer is all more than or equal to 0.5mm.
9. the scan method of a kind of contact type image as claimed in claim 7, is characterized in that, also comprises by a connector joint and sends the signal of telecommunication of the scan-image of finally exporting to external equipment.
10. the scan method of a kind of contact type image as claimed in claim 7, it is characterized in that, three groups of signal of telecommunication a, b, c that in S3, same pixel obtains process by signal processing chip, obtain ABS(a/b-1), ABS(b/c-1) and ABS(a/c-1) in minimum value in the mean value of two groups of signals of telecommunication as the signal of telecommunication of the final output of this pixel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410159767.9A CN103945084A (en) | 2014-04-21 | 2014-04-21 | Contact type image sensor and scanning method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410159767.9A CN103945084A (en) | 2014-04-21 | 2014-04-21 | Contact type image sensor and scanning method thereof |
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| CN103945084A true CN103945084A (en) | 2014-07-23 |
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| CN201410159767.9A Pending CN103945084A (en) | 2014-04-21 | 2014-04-21 | Contact type image sensor and scanning method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0670099A (en) * | 1992-08-20 | 1994-03-11 | Fujitsu Ltd | Picture reading system |
| JP2001339582A (en) * | 2000-05-30 | 2001-12-07 | Minolta Co Ltd | Image reader |
| CN1744655A (en) * | 2004-08-30 | 2006-03-08 | 夏普株式会社 | Image reading device and image forming apparatus |
| CN201336688Y (en) * | 2009-01-15 | 2009-10-28 | 威海华菱光电有限公司 | Contact image sensor |
| CN203552346U (en) * | 2013-10-12 | 2014-04-16 | 深圳市创自技术有限公司 | Dust control mechanism of payment terminal and payment terminal |
-
2014
- 2014-04-21 CN CN201410159767.9A patent/CN103945084A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0670099A (en) * | 1992-08-20 | 1994-03-11 | Fujitsu Ltd | Picture reading system |
| JP2001339582A (en) * | 2000-05-30 | 2001-12-07 | Minolta Co Ltd | Image reader |
| CN1744655A (en) * | 2004-08-30 | 2006-03-08 | 夏普株式会社 | Image reading device and image forming apparatus |
| CN201336688Y (en) * | 2009-01-15 | 2009-10-28 | 威海华菱光电有限公司 | Contact image sensor |
| CN203552346U (en) * | 2013-10-12 | 2014-04-16 | 深圳市创自技术有限公司 | Dust control mechanism of payment terminal and payment terminal |
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Application publication date: 20140723 |
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