CN100463485C - Multiple light source scanning system and its method - Google Patents
Multiple light source scanning system and its method Download PDFInfo
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- CN100463485C CN100463485C CNB2005100878712A CN200510087871A CN100463485C CN 100463485 C CN100463485 C CN 100463485C CN B2005100878712 A CNB2005100878712 A CN B2005100878712A CN 200510087871 A CN200510087871 A CN 200510087871A CN 100463485 C CN100463485 C CN 100463485C
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Abstract
The invention relates to a scanning system and scanning method, with multi light sources, wherein the scanning system comprises: a backlight module, a light sensing module, and a controller; the backlight module has several light sources inside the module; the document is between the backlight module and the light sensing module; the light sensing module moves relative the document and the backlight module, to pick up the image of document; the controller controls the movement of light sensing module, and controls the backlight module to turn on at least part of said light sources; when the light sensing module moves to different positions, relative light sources are turned on, and the light will pass through the document to enter into the light sensing module.
Description
Technical field
The invention relates to a kind of scanning system and scan method thereof, and particularly relevant for a kind of multiple light courcess scanning system and scan method thereof.
Background technology
Current scanline transmission contribution (as positive and negative film) mainly has dual mode, comprises fixed two kinds of light source movable type and light source.Below will its scan mode and pluses and minuses be described at dual mode.
Please refer to Figure 1A, Figure 1A illustrates the fixed scanning schematic diagram of conventional light source.The fixed scanning means 100a of light source is in order to scanning transmission contribution 107.The fixed scanning means 100a of light source comprises light source 101, light guide plate 102 and illuminant module 103.Illuminant module 103 is along with stepping motor moves, with receiving optical signals and change into the signal of telecommunication.And light source is fixed on the light guide plate 102, and the light that light source produces is expanded into uniform directional light via light guide plate 102 and penetrates.And light source 101 and light guide plate 102 can't be along with stepping motor moves.
Please refer to Figure 1B, Figure 1B illustrates the portable scanning of conventional light source schematic diagram.Be different from the fixed scanning means of light source, the portable scanning means 100b of light source makes light source 101 and illuminant module 103 same moved further, and shown in 1B figure, illuminant module 103 moves toward the x direction simultaneously with light source 101.
For the fixed scanning means 100a of light source, because seeing through extension element 102, light transmits, though can produce uniform parallel rays, reduced the brightness of bright dipping simultaneously.If desire improves brightness, then certainly will need to increase the brightness of power consumption with undercompensation.
For the portable scanning means 100b of light source, because light source 101 and illuminant module 102 same moved further, the control of machinery needs more accurate and raises the cost.Simultaneously, the volume of illuminant module 103 generally can be bigger and impracticable.
Summary of the invention
In view of this, purpose of the present invention overcomes problems of the prior art exactly, provides a kind of uniform luminance can be provided, multiple light courcess scanning system and scan method thereof that luminous efficiency is high.
According to purpose of the present invention, a kind of scanning system of multiple light courcess is proposed, in order to scan a transmission contribution, scanning system comprises: backlight module, illuminant module and control unit.Backlight module has several light sources, and these distribution of light sources are in backlight module.The transmission contribution places between backlight module and the illuminant module, and illuminant module moves with respect to transmission contribution and backlight module, with the image of acquisition transmission contribution.Control unit moves in order to the sense of control optical module, and control unit is also relatively controlled backlight module, to light the described light source to small part.When the relative transmission contribution of illuminant module when different time points moves to several positions, the described light source system that corresponds to the part of described position is lighted in regular turn, the light that this light source of lighting sends is to inject this illuminant module after passing this transmission contribution.
According to purpose of the present invention, reintroduce a kind of method for scanning manuscripts, contribution is placed in the scanning system, scanning system comprises backlight module, illuminant module and a control unit, and backlight module has several light sources, and control unit is in order to sense of control optical module and backlight module, the light that those light sources of illuminant module receiving unit are produced, scan method comprises: at first, drive illuminant module, one side make illuminant module moving along this contribution.Come, control unit calculates moving of illuminant module again, and control unit also sends a control signal.Then, backlight module receives control signal.At last, according to control signal with light the part those light sources.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below especially exemplified by an embodiment, and cooperate institute's accompanying drawing, be described in detail below:
Description of drawings
Figure 1A illustrates conventional fixed formula scanning schematic diagram.
Figure 1B illustrates the portable scanning of tradition schematic diagram.
Fig. 2 illustrates the multiple light courcess scanning system stereogram according to first embodiment of the invention.
Fig. 3 illustrates the backlight module stereogram.
Fig. 4 illustrates light-source brightness curve distribution figure.
Fig. 5 illustrates transmission method for scanning manuscripts flow chart.
Fig. 6 illustrates the multiple light courcess scanning system stereogram according to second embodiment of the invention.
Embodiment
First embodiment:
Please be simultaneously with reference to Fig. 2 and Fig. 3, Fig. 3 illustrates the multiple light courcess scanning system stereogram according to first embodiment of the invention.Multiple light courcess scanning system 200 comprises: backlight module 201, illuminant module 203, control unit 205 and stepping motor 202.Backlight module 201, illuminant module 203 are disposed at the both sides of transmission contribution 207, and promptly backlight module 201 is the upside of fixed configurations in transmission contribution 207, and illuminant module 203 packaged types are disposed at the downside of transmission contribution 207.Control unit 205 for example is that (Printed circuit board PCB), is fixed on the multiple light courcess scanning system 200 circuit control panel.And illuminant module 203 can be charge-coupled device (CCD) illuminant module or CMOS (Complementary Metal Oxide Semiconductor) (CMOS) illuminant module.
Please refer to Fig. 3, Fig. 3 illustrates the backlight module stereogram.Have several light sources, light guide plate or reflector plate in the backlight module.Light source 201 is as light source 201a-light source 201f, light source 201 can be light-emitting diode (LED), discharge lamp (Discharge lamp) or other form of light source, preferably with LED as light source, and diffusion components such as light guide plate and reflector plate penetrate in the backlight module 201 uniformly in order to directing light.
For illuminant module 203, its power resources that move are provided by stepping motor 202.Therefore, only want correct calculating to light time and the rotating speed or the step number of control step motor 202 accordingly, just can make to reach to make multiple light courcess scanning system 200 luminous efficiency height and even brightness result by the mode of some bright light source in turn.Wherein, the distance that illuminant module 203 moves becomes positive correlation with the step number of stepping motor 202, and the step number of stepping motor 202 is determined by the number of the pulse of the control signal of control step motor 202.And the adjustment of stepping motor 202 rotating speeds can be reached by the number of the pulse of unit of adjustment in the time.Below will describe at the scanning theory and the control mode of multiple light courcess scanning system.
Please be simultaneously with reference to Fig. 3 and Fig. 4, Fig. 4 illustrates light-source brightness curve distribution figure.In Fig. 4, transverse axis (X-axis) is the position of illuminant module, and the longitudinal axis (Y-axis) is represented brightness (Brightness).When stepping motor 202 drove illuminant module 203, illuminant module 203 moved along transverse axis (X-axis).In Fig. 4,340a represents desirable brightness line (straight line).That is ideally, definite value is kept in illuminant module 203 received brightness in the process that moves.Yet actual Luminance Distribution is as follows:
Please see curve 340c, curve 340c is that the brightness curve of lighting single source 340b distributes.The characteristics of this curve 340c are sections of curve, and protruding both sides are recessed in the middle of being as section i.The physical significance of its representative be under the light source 201a for the brightest, long more with distance under the light source 201a, its brightness is more little, and is the dark distribution in both sides (Luminance Distribution inequality).In like manner, each section i-2 can be like this to section i+2, thereby forms the continuity curve 340c of Luminance Distribution inequality.
In order to solve the problem of Luminance Distribution inequality, satisfy the mode of some bright light source in turn that adopts.Please see curve 340b, curve 340b is that the brightness curve superposition of single source 340b forms, it is the curve 340b representative brightness distribution curve of point bright light source 201a-201f in turn, that is when illuminant module when X-direction moves, the position X2 that supposes illuminant module this moment be positioned at the i section under (light source 201c), this moment, corresponding brightness value was A1 brightness.And because illuminant module continues toward directions X to continue to move, brightness this moment A1 successively decreases then gradually, and is just more little from X2 brightness far away more.When brightness when a certain value, as near A2 brightness, wherein A2 brightness is less than A1, and this moment, the correspondence position of illuminant module was X2a, the corresponding light source of section i+1 (201d) can be lighted then, promptly begins to be provided jointly by light source 201c and light source 201d simultaneously in the brightness of the position of X2a.When illuminant module continues to move along X-direction, brightness this moment increases progressively then gradually, when brightness increases to the brightness near A2, this moment, the correspondence position of illuminant module was X2a ', the corresponding light source of section i (201c) can be closed then, is promptly provided by the corresponding light source 201d of section i+1 in the brightness of the position of X2a ' to get final product.Therefore, but the just brightness of undercompensation.
Whether the light source igniting of each section just can be by that analogy.And for scanned position, in the Luminance Distribution that does not influence not scanning place, the light source of correspondence position just can be closed.In the present embodiment, time point that can the calculation level bright light source make brightness curve level off to ideal curve 340a, that is lightness distribution approaches evenly.
In the multiple light courcess scanning system of present embodiment, provide a kind of scan method.Please refer to Fig. 5, Fig. 5 illustrates transmission method for scanning manuscripts flow chart.Scan method comprises: step 401 at first drives illuminant module 203, one side make illuminant module 203 moving along transmission contribution 207.Come step 403 again, control unit 205 calculates the relative position of illuminant module 203 and backlight module 201, and control unit 205 sends a control signal.Follow step 405, backlight module 201 receives control signals.At last, step 407 backlight module 201 according to control signal in order to light the part those light sources 201a-201f.
Second embodiment
Please refer to Fig. 6, Fig. 6 illustrates multiple light courcess scanning system 500 stereograms of second embodiment of the invention.What be different from first embodiment is also comprise several infrared receivers 506 in a second embodiment in the control unit 505, and illuminant module 503 to dispose an infrared transmitter 508.When illuminant module 503 when the transmission contribution scans for 507 times, see through infrared transmitter 508 and send signal, be positioned at the signal of the infrared receiver 506 receiving infrared-ray reflectors 508 on the control unit 505, each infrared receiver 506 is each light source of the corresponding backlight module 501 of difference.For example the pairing receiver of light source 201a is infrared receiver 506a.If infrared receiver 506a receives the signal of infrared transmitter 508, expression illuminant module 503 is adjacent to light source 201a, so control unit 505 can be lighted by control light source 201a.In this way, by the signal transmission and the reception of infrared transmitter 508 and each infrared receiver 506, the time point of light source igniting can be more accurate, makes the quality and the uniformity lifting more of 503 sensitization of associative perception optical module.
Above-mentioned first embodiment of the present invention and disclosed multiple light courcess scanning system of second embodiment and scan method thereof, utilize the mode of lighting several light sources in turn, not only do not have the bulky shortcoming of the portable backlight module of light source, it is not high not have the fixed luminous efficiency of light source yet, and the phenomenon of brightness irregularities produces, and then can promote the quality of scanning of whole scanning system.
Though multiple light courcess scanning system of the present invention and scan method thereof are that example explains with the scanning of transmission contribution.The scan mode of several light sources is lighted in right utilization in turn, the scanning that also can be used for reflecting contribution, and its difference is: when being used to reflect the scanning of contribution, backlight module, illuminant module are disposed at the same side of reflection contribution.
In sum; though the present invention with a preferred embodiment openly as above; right its is not in order to limit the present invention; any insider; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (15)
1. the scanning system of a multiple light courcess, in order to the scanning transmission contribution, this scanning system comprises:
Backlight module, this backlight module has a plurality of light sources, and those distribution of light sources are in this backlight module;
Illuminant module, this transmission contribution place between this backlight module and this illuminant module, and this illuminant module moves with respect to this transmission contribution and this backlight module, to capture the image of this transmission contribution; And
Control unit, in order to control moving of this illuminant module, this control unit is also relatively controlled this backlight module, to light to those light sources of small part;
Wherein this transmission contribution is when different time points moves to a plurality of diverse location relatively when this illuminant module, and those light sources of part of corresponding those positions are lighted in regular turn, and the light that those light sources of lighting send is injected this illuminant module after passing this transmission contribution.
2. system according to claim 1, it is characterized in that, this scanning system also comprises stepping motor, move in order to drive this illuminant module, this control unit is by the rotating speed or the step number of this stepping motor, to calculate the position of this illuminant module, whether light the corresponding light source of this illuminant module position with decision.
3. system according to claim 1, it is characterized in that, this illuminant module comprises reflector, this control unit comprises a plurality of receivers, the position of each those receiver is provided with corresponding to the position of each those light source, whether by making this reflector output signal to one of those receivers, this control unit is learnt the position of this illuminant module, light to determine those light sources of corresponding part.
4. system according to claim 3 is characterized in that, this reflector and this recipient are respectively infrared transmitter and infrared receiver.
5. system according to claim 1 is characterized in that this backlight module comprises light guide plate, and this light guide plate penetrates this backlight module equably in order to the light of those light sources generations of leader.
6. system according to claim 1 is characterized in that, this illuminant module is charge coupled device ccd illuminant module or CMOS (Complementary Metal Oxide Semiconductor) CMOS illuminant module.
7. system according to claim 1 is characterized in that, those light sources are distributed in the scanning area equably, and this illuminant module captures the image of this transmission contribution in this scanning area.
8. system according to claim 1 is characterized in that those light sources are lighted one by one, and once only one of those light sources or two lighted, other those light sources are extinguished.
9. a multiple light courcess method for scanning manuscripts is characterized in that, is used for having the scanning system of a plurality of light sources, the position that can move according to illuminant module, and those light sources that the corresponding points highlights divides, this scan method comprises:
By this illuminant module of step motor drive, this illuminant module is moved along this contribution;
Calculate moving of this illuminant module, and send control signal;
Receive this control signal; And
In order to light those light sources of part, make illuminant module receive the light that those light sources produced of this part according to this control signal.
10. multiple light courcess method for scanning manuscripts according to claim 9 is characterized in that, receive the step of this control signal at this backlight module after, also comprise according to this control signal and close another those light sources partly.
11. multiple light courcess method for scanning manuscripts according to claim 9 is characterized in that, in the step that this illuminant module of calculating moves, also comprises:
Whether the Luminance Distribution of those light sources of calculating section sends control signal with decision.
12. multiple light courcess method for scanning manuscripts according to claim 9 is characterized in that, the step that moves at this illuminant module of calculating comprises:
The transmitting site signal;
Receive this position signalling; And
According to this position signalling, calculate the position that this illuminant module moves.
13. multiple light courcess method for scanning manuscripts according to claim 12 is characterized in that, this position signalling is an infrared signal.
14. multiple light courcess method for scanning manuscripts according to claim 9 is characterized in that, the step that moves at this illuminant module of calculating comprises:
Calculate the rotating speed or the step number of this stepping motor, calculate the position that this illuminant module moves according to rotating speed or step number.
15. multiple light courcess method for scanning manuscripts according to claim 9 is characterized in that, those light sources can see through light guide plate, so that the light that those light sources produce can penetrate equably.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100878712A CN100463485C (en) | 2005-08-01 | 2005-08-01 | Multiple light source scanning system and its method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100878712A CN100463485C (en) | 2005-08-01 | 2005-08-01 | Multiple light source scanning system and its method |
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| Publication Number | Publication Date |
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| CN1909586A CN1909586A (en) | 2007-02-07 |
| CN100463485C true CN100463485C (en) | 2009-02-18 |
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| CNB2005100878712A Expired - Fee Related CN100463485C (en) | 2005-08-01 | 2005-08-01 | Multiple light source scanning system and its method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5959746A (en) * | 1997-06-04 | 1999-09-28 | Tsai; Shui Chuan | Lighting system having partially overlapping light sources for an image scanning device |
| CN1412623A (en) * | 2001-12-26 | 2003-04-23 | 威盛电子股份有限公司 | Base plate exposure device and method |
| CN1453996A (en) * | 2002-04-26 | 2003-11-05 | 佳能株式会社 | Image reading apparatus |
| CN1494311A (en) * | 2002-08-23 | 2004-05-05 | 力捷电脑股份有限公司 | Image scanning device light source control method and apparatus |
| CN2655556Y (en) * | 2003-12-05 | 2004-11-10 | 北京五岳鑫信息技术有限公司 | Step output multi-light source contact type image sensor |
-
2005
- 2005-08-01 CN CNB2005100878712A patent/CN100463485C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5959746A (en) * | 1997-06-04 | 1999-09-28 | Tsai; Shui Chuan | Lighting system having partially overlapping light sources for an image scanning device |
| CN1412623A (en) * | 2001-12-26 | 2003-04-23 | 威盛电子股份有限公司 | Base plate exposure device and method |
| CN1453996A (en) * | 2002-04-26 | 2003-11-05 | 佳能株式会社 | Image reading apparatus |
| CN1494311A (en) * | 2002-08-23 | 2004-05-05 | 力捷电脑股份有限公司 | Image scanning device light source control method and apparatus |
| CN2655556Y (en) * | 2003-12-05 | 2004-11-10 | 北京五岳鑫信息技术有限公司 | Step output multi-light source contact type image sensor |
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| CN1909586A (en) | 2007-02-07 |
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Granted publication date: 20090218 |