Embodiment also is described in further detail the utility model in conjunction with the accompanying drawings below by specific embodiment.
As everyone knows, various materials have different reflectivity and absorptivity to the light of different wave length, and the chromatogram of surface color has higher reflectivity to the material between the blueness to infrared light in redness, and black material has higher absorptivity to infrared light.If have on a kind of printed matter chromatogram in redness to the colored reticulate pattern background between the blueness, have simultaneously the Word message of black again, under the infrared light irradiation, just background and Word message can be distinguished and come with imageing sensor scanning.Utilize same principle can adopt the light source of different wave length and optical image sensor to select to obtain the scanned character image information that goes up different color.For example, if certain form adopts green the printing, adopt black pen to fill in again, then scanner uses monochromatic green light source scanning, can extract the information that black pen is filled in, and is very beneficial for the identification and the storage of handwritten text message.
As shown in Figure 1 be the schematic block circuit diagram of optical imagery scanner, comprise control module 10, memory module 20, optical image sensor module 30, interface module 40, motor and driver module 50 thereof and control panel module 60.
Control module 10 is main control chips of scanner, is responsible for and main-machine communication, produces the needed control signal of each module, and the data that the reception imageing sensor transmits are also handled, and are uploaded to host computer then.
Memory module 20 is as the interim storage space of the buffering in the data processing transfer process, and it is very big that this carries out the data volume that treatment conversion, imageing sensor transmit because of main control chip.Memory module also can be deposited the cognizance code of some scanners, as the type of scanner, and rank, version number and manufacturer's ID etc.
Optical image sensor 30, according to the control signal of main control chip select and put in order azarin, green, blue, infrared or ultraviolet lamp tube scans, and passes to main control chip scanning a gained signal.
Interface module 40 is interface circuits, and it is an interface of two-way communication between main control chip and computer.
Motor and driver module 50 thereof can produce enough big driving force by the motor driven paper feed according to four phase input signals of main control chip, perhaps drive optical image sensor 30 scannings.
Control panel module 60 is provided with keying circuit, working station indicator etc., and performance that can the enhanced ct scans instrument makes it more humane, operates more flexibly, uses more convenient.
As an embodiment of the present utility model, be a kind of structural representation of Certificate scanner as shown in Figure 2, comprise loam cake 1, middle cover 2, lower cover 5; Optical image sensor module 3 and moving track and making-up unit are arranged between middle cover 2 and lower cover 5, also have motor 4 and gear train thereof.Shown in Figure 2 is a kind of plate scanner, and those skilled in the art can both understand, and according to principle of the present utility model, also can be designed to paper feeding scanner.
The embodiment of paper feeding scanner of the present utility model sees Fig. 3 and Fig. 4.As shown in Figure 3, paper feeding scanner comprises housing 101, driving and scanister 102 and circuit board 103.Its middle shell 101 comprises loam cake 11 and lower cover 12, and its inner cavity that forms of combination back is provided with certificate inlet 111 on loam cake 11, and the intersection of loam cake 11 and lower cover 12 is located in the certificate outlet.Drive and scanister 102 comprises first support member 211 and second support member 212, also comprise imageing sensor module 3, roll bar 23, CD-ROM drive motor 24, train of reduction gears 25.First support member 211 and second support member 212 are individually fixed in the relative both sides of lower cover 12, on the opposite face of first support member 211 and second support member 212, respectively be provided with driving rod 2111,2121 and pivoted hole 2112,2122, position at the two ends of imageing sensor module 3 with respect to driving rod 2111,2121 respectively is provided with pivoted hole 221, and cooperating between driving rod 2111,2121 and its corresponding pivoted hole 221 makes imageing sensor module 3 be positioned between first support member 211 and second support member 212 and close on the certificate exit; Roll bar 23 two ends relative engagement simultaneously on first support member 211 and second support member 212 in the set pivoted hole 2112,2122, this project organization makes that rolling bar 23 and imageing sensor module 3 is parallel to each other and has certain intervals and be used for scanned passing through.CD-ROM drive motor 24 is assembled on first support member 211, and the train of reduction gears of being made up of gear not of uniform size 25 also is positioned on first support member 211, and train of reduction gears 25 is rolled bar 23 rotations with the transmission of power of CD-ROM drive motor 24 and the rear drive of slowing down.Circuit board 103 is positioned in the lower cover 12, and have with imageing sensor module 3 and CD-ROM drive motor 24 and to be electrically connected, circuit board 103 also connects the interface arrangement 131 that can be used for connecting host computer, this interface arrangement 131 not only can be used as data channel, still be power channel simultaneously, the power supply of CD-ROM drive motor 24 and imageing sensor module 3 is provided by circuit board 103.A side of certificate inlet 111 has infrared window 113 on loam cake 11, under these infrared window 113 positions infrared sensor 132 is arranged, and whether be used for perception has scanned insertion, and utilizes this signal to make scanner prepare scanning.
As shown in Figure 4, in the housing 1 imageing sensor module 3 with roll bar 23 and be close in the certificate outlet, when scanned by loam cake 11 on certificate inlet 111 insert, this is scanned will to enter housing 1 and from imageing sensor module 3 with roll between the bar 23 and pass through, imageing sensor module 3 and roll gap between the bar 23 and make the two sides scanning of a surface of contact image sensor module 3 and the surface of rolling bar 23 simultaneously of certificate.Because the scanned scanning of a surface of imageing sensor module 3 contacts is a shiny surface, so when scanning switch 132 starts CD-ROM drive motor 24 rotations, or when seeing through the external software instruction and start CD-ROM drive motor 24 rotations by interface arrangement 131, roll its surperficial friction force of bar 23 mats and drive scanned scanning of a surface by imageing sensor module 3, and be sent to outlet with scanned, this moment, imageing sensor module 3 was converted to electrical signal transfer to circuit board 103 with scanned optical image, was sent to host computer by coupling arrangement 131 again.Use screw fixing spring holding piece 222 respectively in the two sides of imageing sensor module 3, and the small embossment thing 2113 and 2123 that connects on this spring holding piece 222 and corresponding first support member 211 and second support member 212 with spring 223 respectively; This structure can make imageing sensor module 3 to do the rotation of limited angle around the axis that driving rod 2111,2121 constitutes, and provides certain elastic pressure to make the scanned scanning plane of pressing close to imageing sensor module 3; And can adapt to scanned different-thickness, and utilize the skin-friction force that rolls bar 23 to drive scanned process.
As shown in Figure 5 be the composition synoptic diagram of image sensor module 30 of the present utility model, comprise infrared diode array module 31, primaries source module 32, column lens array module 33, sensor assembly 34, gain and compensation control module 35; Infrared diode array module 31 comprises that one comes and is equivalent to be scanned the infrared light light emitting diode matrix of arranging on the part Width; Primaries source module 32 comprises redness, green, blue three kinds of light emitting diodes, and the light that Tricolor LED sends can make it have uniform brightness by the effect of light pipe on the length that is equivalent to the scanned document width; Column lens array 33 can focus on reflected light or the transmitted light that comes from scanned document on the optical image sensor; Image sensor module 34 receiving optical signals also become electric signal according to its intensity-conversion, and this electric signal is read and send to gain and compensation control module 35 by shift register; Gain and compensation control module 35 are handled sweep signal according to gain and penalty coefficient.
Image sensor module 30 is a specific embodiment of the present utility model as shown in Figure 5, be not to restriction of the present utility model, the person skilled in art can both understand the specific design scheme can be had multiple, for example infrared diode array module 31 also can adopt lamp guide, and primaries source module 32 also can adopt light emitting diode matrix.
The utility model also can be designed to the combination of ultraviolet source and three primary colors light source.
Image sensor module of the present utility model has four kinds of light sources, can in scanning, select to adopt a kind of or multiple light source, for example select three-color light source, infrared source working, perhaps select ultraviolet source scanning, select the monochromatic visible light source to implement scanning according to concrete needs.Image sensor module also can include only a kind of visible light source and infrared or ultraviolet source.
Comprise imageing sensor module 3 in the image sensor module 30, as shown in Figure 6 be the structural representation of imageing sensor module 3 of the present utility model, the length of imageing sensor module 3 is equivalent to be scanned the width of part, walking abreast along its length on its end face is provided with infrared or ultraviolet diode array 301 and three primary colors light source lamp guide 302, between infrared or ultraviolet diode array 301 and three primary colors light source lamp guide 302, be provided with column lens array 33, bottom at imageing sensor module 3, there is image sensor array 304 at 33 places over against column lens array, bottom at imageing sensor module 3, the next door of image sensor array 304 also has printed circuit board (PCB) 309, also schematically shows the position that is scanned part 308 among the figure.
Fig. 7 is another structural representation of imageing sensor module of the present utility model, and the outline of imageing sensor module 3 is a rectangular parallelepiped, and its length is equivalent to be scanned the width of part, comprises glass 371; Lamp guide 372; Light source 373; Lens combination 374; Shell 375; Circuit board 376; Electric connector 378 and metal holder 377; On circuit board 376, also has image sensor array 304 over against lens combination 374 places.Have Red Green Blue light emitting diode and infrarede emitting diode or ultraviolet light-emitting diode in the light source 373; Also can have only a kind of light emitting diode in the light source 373; Have on the end face of lamp guide 372 on the light source 373 and can see through the optical window of various light and closely cooperate, be used for scanning on the glass 371 thereby light that light source 373 sends is radiated at through the even action of lamp guide 372 with lamp guide 372.Lens combination 374 is installed in the shell 375, and the light that is scanned the part reflection shines in lens combination 374 through glass 371, and is converged at image sensor array 304.Image sensor array 304 is converted to electric signal with this light signal, and this electric signal spreads out of by electric connector 378 through the back of the processing such as preposition amplification on the circuit board 376.Metal holder 377 is combined glass 371, shell 375 and circuit board 376 clampings of imageing sensor module 3.
For example on the bank note, have the anti-fake mark with the ultraviolet sensitivity material at some printed matter, this anti-fake mark is sightless under the environment of visible light, but under UV-irradiation, can be inspired visible light, thereby shows anti-fake mark.At this anti-fake mark, an embodiment of the present utility model is, a kind of scanner adopts ultraviolet and visible light source, and lens and scanned between or between lens and image sensor array, have can the mistake filtering ultraviolet optical filter.
The collaborative work under software control of the hardware of scanner is obtained the view data that is scanned part by the scan mode that the user is provided with, so that the user therefrom extracts required useful information.With host apparatus that scanner is connected in have the driver of scanner.As an embodiment of the present utility model, shown in Figure 8 is the workflow synoptic diagram with scanner of four kinds of light sources.
After scanner connects, at first answer initialization scan instrument 782, detect then and whether carried out overcorrect, as denying the correction data 784 that then obtains and preserve three primary colors light source and infrared light supply; After the user asked scanning, scanning operation and writing scan data 786 handled 787 with scan-data by user's request then, and the data after will handling are again submitted to user 788 by the mode of user's request.
In initialization scan instrument 782 steps, finish being connected and the initialization of scanner self of scanner and host computer.
In correction data 784 steps of acquisition and preservation three primary colors light source and infrared light supply, can obtain various correction datas, be used in real image acquisition procedures, going to improve the raw data of image, so that offer the scan-data of user's the best.This is the consistency problem in order to solve different scanners and to be scanned difference on the part, because under the situation of various reality, the signal that image sensing module obtains can not produce identical output to different scanners, and the output reference difference that produces at the difference of full line.In this step, obtain the optimal gain and the compensation of full line from actual signal, and the optimal time shutter of obtaining full line.Under the condition of not having illumination, actual scanning obtains the signal of delegation, and service routine is calculated the gain of full line data.Under the condition of illumination fully, adjust the time shutter, make output reach optimal predetermined value, preserve this time shutter; And under this time shutter, actual scanning obtains the signal of delegation, and service routine is calculated the compensation of full line data.Obtain the optimal gain and the compensation of difference the full line then from actual signal.Under the condition of not having illumination, actual scanning obtains the multirow signal, the gain of each point behind average each line data of service routine calculating.Under the optimal time shutter, actual scanning obtains the multirow signal, the compensation of each point behind average each line data of service routine calculating.
In scanning operation and writing scan data 786 steps, at first carry out hardware setting, the resolution of motor rotary speed, optical image sensor etc. for example is set.After obtaining digital signal, digital signal must be proofreaied and correct according to the gain of proofreading and correct and the data of compensation.Digital signal after this correction (image pixel) can be reappeared the image of scanned document fully.In when operation scanning, according to the user both be provided with can infrared scan and the scanning of three primary colors light source carry out respectively, promptly earlier will be scanned part and sweep one time with infrared light supply, sweep one time with the three primary colors light source again; Also can infrared scan and the scanning of three primary colors light source carry out simultaneously, can also select a kind of light source to work independently and finish being scanned the scanning of part.
In that scan-data is handled by user's request in 787 steps, scan-data can be organized into piece image, perhaps be organized into two width of cloth images that contain different information respectively.
Data after will handling are submitted in user's 788 steps by the mode of user's request, and the data that scanning is obtained offer the user by the mode that shows, prints or fax.