CN1917551A - Contact type image sensing device - Google Patents
Contact type image sensing device Download PDFInfo
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- CN1917551A CN1917551A CN 200510091962 CN200510091962A CN1917551A CN 1917551 A CN1917551 A CN 1917551A CN 200510091962 CN200510091962 CN 200510091962 CN 200510091962 A CN200510091962 A CN 200510091962A CN 1917551 A CN1917551 A CN 1917551A
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- image sensing
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Abstract
The apparatus comprises: a light source for generating monochromatic light; the generated monochromatic light is used to illuminate the object; a white light source for generating white light for illuminating the object; and a light sensor for sensing the monochromatic light reflected by the object in order to scan the object under a color scanning mode, or for sensing the white light reflected from the object in order to scan the object under a black and white scanning mode.
Description
Technical field
The invention provides a kind of contact image sensing device, refer to a kind of contact image sensing device that has the high-velocity scanning ability in the black and white scan pattern especially.
Background technology
(contact image sensor CIS) is a kind of of linear sensor to contact-type image sensor, is should be used for the image or the file on plane are scanned into electronic format,, shows the photoelectric cell of handling or transmitting so that store.The modular design that its maximum characteristic is integrated not only makes application product have frivolous characteristic, and because assembling easily, can be saved production cost, main application product is a facsimile machine, image reading apparatus or the like.
See also the 1st figure, the 1st figure is the device schematic diagram of known contact-type image sensor 100.Shown in the 1st figure, contact-type image sensor 100 is by the light source module 110 of strip (or being called linear light sources), and from focus lens array (rod lens array) 120, and light-sensing element array 130 is constituted.When scan image, linear light sources 110 can be sent light earlier to the scanning of original copy 150 online (i.e. dotted line on the 1st figure original copy 150), then by the light of assembling from original copy 150 reflections from focus lens array 120, and image on the light-sensing element array 130, and each photo-sensitive cell converts the color of a line on the original copy 150 or black and white gray scale variation to electronic signal output in the light-sensing element array 130.In addition, because roller 140 can roll, original copy 150 just can be along with roller 140 moves, and therefore, contact-type image sensor 100 can be scanned into electronic format line by line with original copy 150.Contact-type image sensor 100 directly contacts with original copy when this note that owing to scanning, and therefore the title of contact-type image sensor is arranged.
See also the 2nd figure at this, the 2nd figure is the circuit function calcspar of the contact-type image sensor 100 shown in the 1st figure.Shown in the 2nd figure, in general, linear light sources 110 is by light-emitting diode (the light emitting diode of Red Green Blue, LED) 210,220,230 constitute, mode with end face irradiation (edge light) constitutes full-color cheaply linear light sources, and when scan image, the light-emitting diode 210,220,230 of Red Green Blue is lit a lamp fast in proper order, to obtain the tricolor signal of image; In addition, be to constitute from focus lens array 120 by row's graded index lens pillar (radialgradient index lens), the refractive index of each lens radially changes, and makes lens pillar have the function of imaging.Therefore, wholely original copy lastrow data can be imaged on the light-sensing element array 130 with one to one ratio, therefore the title from the focus lens array is arranged from focus lens array 120.And light-sensing element array 130 is to scrabble up suitable length by several photo-sensitive cells, early stage contact-type image sensor 100 employed photo-sensitive cells have a-Si, CdS, MOS etc. several, in recent years for the sensitivity that improves transducer (in other words, in order to improve scan efficiency), the CMOS photo-sensitive cell that light-sensing element array 130 is all made with silicon (Si) chip mostly or constitute with charge coupled cell transducer (charge coupled devicesensor, CCD sensor) chip.
In addition, light source module 110 except aforesaid strip, from focus lens array (rod lensarray) 120, and outside the light-sensing element array 130, the circuit of the contact-type image sensor 100 shown in the 2nd figure includes time schedule controller 160 and buffer 170 in addition.Time schedule controller 160 is to be coupled to light-sensing element array 130, be used for triggering each photo-sensitive cell of light-sensing element array 130 with specific sequential, so can be according to the sequential of time schedule controller 160, positively brightness (or colored) data transaction with each pixel on the original copy becomes electronic data to export continuously, and these electronic data just become output signal V after through buffer 170 bufferings
Out, to promote the circuit (such as image processing circuit) of next stage.
As previously mentioned, when color mode (color mode), the light-emitting diode 210,220,230 of Red Green Blue can be lit a lamp fast in proper order in the linear light sources 110, to obtain the tricolor signal of image, and light-sensing element array 130 is according to this tricolor signal, to produce corresponding electronic signal; Yet such design has a problem in the running, because when black and white scan pattern (BW mode), the light-emitting diode 210,220,230 that still can only use Red Green Blue is as light source; In general, for scan efficiency, we often only adopt the usefulness of one of them light-emitting diode as light source, for instance, can only adopt red light-emitting diode 210 with light source, clearly, only scan with ruddiness as black and white scanning, the quality that scanning is come out is not good enough when using red light source (because, the red area on the original copy and white portion are difficult to differentiation); And another kind to do rule be in order to ensure quality of scanning, therefore still use the light-emitting diode 210,220,230 of all Red Green Blues, by the time after trichromatic scanning all finishes, trichromatic scanning result is analyzed to produce the scanning result of black and white scanning, still such way clearly is short of efficient again again.
Summary of the invention
Therefore one of main purpose of the present invention is to provide a kind of and can takes into account the contact image sensing device of scan efficiency and quality of scanning in color mode and black and white scan pattern, to solve the problems of the prior art.
The present invention discloses a kind of contact image sensing device (contact image sensor), and it includes: light source module is used for producing monochromatic light (monochromatic light), and this monochromatic light is exposed to object; White light source is used for producing white light, and with this white light to this object; And optical sensor (sensor), be used for sensing this monochromatic light from the reflection of this object, with in following this object of scanning of color mode (colormode), perhaps be used for sensing from this white light of this object reflection, with in black and white scan pattern (BW mode) this object of scanning down.
Contact image sensing device of the present invention is when the black and white scan pattern, can directly utilize white light source to carry out scan operation, because white light source can directly reflect the GTG value of original copy black and white scanning, therefore only need carry out the scan operation that single pass just can be finished white-black pattern, in other words, the present invention not only has the high quality of scanning of black and white scanning, has also taken into account the scan efficiency of black and white scanning simultaneously.
Description of drawings
The 1st figure is the device schematic diagram of existing contact-type image sensor.
The 2nd figure is the circuit function calcspar of the contact-type image sensor shown in the 1st figure.
The 3rd figure is the circuit function calcspar of contact-type image sensor of the present invention.
[main element label declaration]
| 100、300 | Contact- | 110、310 | |
| 120、320 | From the | 130、330 | Light-sensing element array |
| 160、360 | Time schedule controller | 170、370 | Buffer |
| 210、311 | Red light emitting diodes | 220、312 | Blue LED |
| 230、313 | Green | 314 | White light-emitting diode |
| 150 | | 140 | Roller |
Embodiment
See also the 3rd figure, the 3rd figure is the circuit function calcspar of contact-type image sensor 300 of the present invention.Shown in the 3rd figure, contact-type image sensor 300 includes light source module 310, from focus lens array 320, light-sensing element array 330, time schedule controller 360 and buffer 370.In fact, the basic principle of contact-type image sensor 300 and aforesaid contact-type image sensor 100 are the same, light source module 310 is used for producing light, and with the rayed that generates to original copy, then again by the light of assembling from the original copy reflection from focus lens array 320, and image on the light-sensing element array 330; And time schedule controller 360 is to be coupled to light-sensing element array 330, therefore, each photo-sensitive cell is controlled by time schedule controller 360 in the light-sensing element array 330, to convert the color or the black and white gray scale variation of a line on the original copy to electronic signal continuously, and these electronic signals are through after the buffer 370, just with output signal V
OutMode export, to drive the circuit (not being shown in the 3rd figure) of next stage.
Please note at this, contact-type image sensor 300 of the present invention and existing contact imageing sensor 100 different places are: the light source module 310 of contact-type image sensor 300 of the present invention has also comprised white light-emitting diode 314 in addition except the light-emitting diode 311,312,313 of the Red Green Blue that originally just has; And the associative operation of white light-emitting diode 314 will describe in detail in following exposure.
When color mode (color mode), contact-type image sensor 300 can be with light-emitting diode 311,312,313 usefulness as light source of Red Green Blue in the light source module 310, to obtain the tricolor signal of image (original copy), and light-sensing element array 330 is according to this tricolor signal, to produce corresponding electronic signal; And when black and white scan pattern (BW mode), contact-type image sensor 300 does not just re-use the light-emitting diode 311,312,313 of Red Green Blue, and uses the usefulness of white light-emitting diode 314 as light source instead; Therefore, because what white light-emitting diode 314 itself sent is white light, for the black and white scan pattern, utilize white light source can determine the gray scale variation of original copy rapidly, and also avoided the known shortcoming of only utilizing a primary lights, for instance, utilized white light to carry out scan operation, do not have the situation of identification difficulty, the quality of scanning when it is hereby ensured white-black pattern scanning; In addition, for the aforementioned light-emitting diode 311,312,313 of all Red Green Blues of taking to guarantee the way of quality of scanning, the present invention utilizes white light source, just can save the sweep time of utilizing three light source scannings to waste, so black and white scan efficiency of the present invention in theory can reach three times of preceding method haply, in other words, the present invention also can have good scan efficiency.
In addition, the present invention does not limit the photo-sensitive cell that is adopted in the light-sensing element array 330, and in other words, light-sensing element array 330 can adopt CMOS sensitive chip, CCD sensitive chip or other diversiform photo-sensitive cell, so corresponding variation, and without prejudice to spirit of the present invention.
Clearly, contact-type image sensor 300 of the present invention is to be used for scanning document or other any original copy, so the present invention can be applicable to scanner, facsimile machine, and multifunctional paper feeding machine is among photocopier or other the electronic installation; In other words, the present invention does not limit contact-type image sensor 300 applied scopes, and all electronic installations with scan function all can utilize contact-type image sensor 300 of the present invention to carry out black and white and chromoscan.
Compared to prior art, the present invention not only can utilize the light source of Red Green Blue to carry out the chromoscan operation, and when the black and white scan pattern, the present invention can directly utilize white light source to carry out scan operation, because white light source can directly reflect the GTG value of original copy black and white scanning, therefore only need carry out the scan operation that single pass just can be finished white-black pattern, compared with the existing mode of utilizing monochromatic source as white light source, the present invention not only has the high quality of scanning of black and white scanning, has also taken into account the scan efficiency of black and white scanning simultaneously.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (6)
1. contact image sensing device, it includes:
Light source module is used for producing monochromatic light, and this monochromatic light is exposed to object;
White light source is used for producing white light, and with this white light to this object; And
Optical sensor is used for sensing from this monochromatic light of this object reflection, with in color mode this object of scanning down, perhaps is used for sensing from this white light of this object reflection, with this object of scanning under the black and white scan pattern.
2. contact image sensing device according to claim 1, wherein this optical sensor is to be made of CMOS field-effect transistor transducer.
3. contact image sensing device according to claim 1, wherein this optical sensor is to be made of the charge coupled cell transducer.
4. contact image sensing device according to claim 1, it is to be applied to scanner.
5. contact image sensing device according to claim 1, it is to be applied to photocopier.
6. contact image sensing device according to claim 1, it is to be applied to multifunctional paper feeding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510091962 CN1917551A (en) | 2005-08-15 | 2005-08-15 | Contact type image sensing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510091962 CN1917551A (en) | 2005-08-15 | 2005-08-15 | Contact type image sensing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1917551A true CN1917551A (en) | 2007-02-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510091962 Pending CN1917551A (en) | 2005-08-15 | 2005-08-15 | Contact type image sensing device |
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|---|---|
| CN (1) | CN1917551A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420496B (en) * | 2007-10-26 | 2012-03-28 | 山东新北洋信息技术股份有限公司 | Method and equipment for collecting image |
-
2005
- 2005-08-15 CN CN 200510091962 patent/CN1917551A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420496B (en) * | 2007-10-26 | 2012-03-28 | 山东新北洋信息技术股份有限公司 | Method and equipment for collecting image |
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