CN1527579A - Circuit board with image selecting elements - Google Patents
Circuit board with image selecting elements Download PDFInfo
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- CN1527579A CN1527579A CNA031195040A CN03119504A CN1527579A CN 1527579 A CN1527579 A CN 1527579A CN A031195040 A CNA031195040 A CN A031195040A CN 03119504 A CN03119504 A CN 03119504A CN 1527579 A CN1527579 A CN 1527579A
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- integrated circuit
- signal
- image selection
- selection element
- asic
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Abstract
The circuit board with image selecting elements includes analog front end and time sequence generator integrated inside one integrated circuit, and the integrated circuit is connected with a specific application integrated circuit, which feeds sync signal to the integrated circuit for the synchronous transmission of digital signal in between. Owing to the analog front end and the time sequence generator integrated inside the same integrated circuit, the analog signal is transmitted in very short distance from the image selecting element to the analog front end, and this reduces the interference and attenuation of the analog signal.
Description
Technical field
The present invention relates to a kind of image selection element plate, relate in particular to and a kind ofly comprise AFE (analog front end) and sequential generator, and AFE (analog front end) and sequential generator are integrated in the image selection element plate in the same integrated circuit.
Background technology
Scanner is a kind of a kind of machine between photocopier and camera.In the past because expensive price almost is some patents as particular job persons such as artistic workings.In recent years,, squeezed into the main flow in the personal computer world finally, become the senior general of personal computer peripheral device equipment because the price that strong competition the caused downslide in scanner market is added in advancing by leaps and bounds of computer technology.
Scanner can be divided into some kinds of forms according to its price or function, and general scanner is broadly divided into handly scanner, paper feeding scanner, business card scanner, negative film scanner and falt bed scanner etc.Wherein, the similar glass platform of falt bed scanner is that file or pattern are placed on the flat glass, is moved by transducer and data is read in.Because its structure is can be too complicated, and also difficulty not too of using method, add the function extendibility that it has height, therefore become the arrange in pairs or groups main flow of scanner of computer user now.
In scanner, the way of prior art is with ASIC(Application Specific Integrated Circuit) (ApplicationSpecific Integrated Circuit, be called for short ASIC) and AFE (analog front end) (Analog Front End, be called for short AFE) be positioned on the mainboard (Main Board), and be built in the ASIC(Application Specific Integrated Circuit) in the clock generator.Because at image selection element plate (for example is charge coupled cell (Charge CoupledDevice, abbreviation CCD) analog electrical signal that is transmitted between image selection element (for example being charge coupled cell) plate) and the AFE (analog front end) is the signal of higher-frequency, and the way of prior art can make that the transmission range of analog electrical signal is longer, so such way can make scanner can produce higher electromagnetic interference (Electromagnetic Interference is called for short EMI).For the purpose of clearer, please refer to Fig. 1, shown in the figure the mainboard 102 in existing a kind of scanner 10 and the functional block diagram of image selection element plate (for example CCD board) 104.As shown in Figure 1, mainboard 102 comprises ASIC(Application Specific Integrated Circuit) 106, AFE (analog front end) 108 and oscillator 110, wherein ASIC(Application Specific Integrated Circuit) 106 is built-in clock generator.And image selection element plate 104 comprises image selection element (for example being charge coupled cell) 112.Function mode between mainboard 102 and the image selection element plate 104 will be described below.The light signal of gained converted analog electrical signal to when at first, image selection element 112 will scan file.Then, analog electrical signal converts digital electric signal to through AFE (analog front end) 108.Then, digital electric signal is sent to ASIC(Application Specific Integrated Circuit) 106 and processes.And ASIC(Application Specific Integrated Circuit) 106 transmits serial input signals to AFE (analog front end) 108, and meeting transmitted image selection element input signal is to image selection element 112.Various sequential in this operation are to be provided by the clock generator in the ASIC(Application Specific Integrated Circuit) 106, and oscillator 110 is sent to clock generator with the oscillator signal that produces, so that clock generator produces various sequential.In this operation, because that the analog electrical signal that is sent to AFE (analog front end) 108 from image selection element 112 is the distance of the signal of higher-frequency and transmission is quite long, so can produce very high electromagnetic interference.Because electromagnetic interference can influence the health of human body,, therefore how to reduce the electromagnetic interference of scanner and the standard that meets various countries' defined is considerable so all there is certain standard various countries for the electromagnetic interference of electronic product.
Summary of the invention
For addressing the above problem, the invention provides a kind of image selection element plate.Because AFE (analog front end) and sequential generator that image selection element plate of the present invention is comprised are integrated in the same integrated circuit, so be sent to from the image selection element AFE (analog front end) analog electrical signal the distance of process quite short, therefore can reduce the interference and the decay of analog signal.
For reaching above-mentioned and other purpose, the invention provides a kind of image selection element plate.This image selection element plate is coupled to ASIC(Application Specific Integrated Circuit).This image selection element plate comprises image selection element and integrated circuit.Above-mentioned image selection element is used to receive the light signal of gained when scanning file, and converts light signal to analog electrical signal.And said integrated circuit is coupled to image selection element and ASIC(Application Specific Integrated Circuit).This integrated circuit comprises AFE (analog front end) and sequential generator.Wherein, AFE (analog front end) is used for converting analog electrical signal to digital electric signal, and digital electric signal is sent to ASIC(Application Specific Integrated Circuit).And clock generator is used to produce the required various sequential of image selection element.In addition, ASIC(Application Specific Integrated Circuit) is sent out synchronizing signal to integrated circuit, and makes the digital electric signal that is transmitted between integrated circuit and the ASIC(Application Specific Integrated Circuit) can reach synchronous.
In a preferred embodiment of the present invention, image selection element plate also comprises oscillator, is used to produce oscillator signal, and this oscillator signal is sent to clock generator, so that clock generator produces various sequential.
In a preferred embodiment of the present invention, the wait state time of synchronizing signal control timing generator is so that the digital electric signal that is transmitted between integrated circuit and the ASIC(Application Specific Integrated Circuit) can reach synchronous.
In a preferred embodiment of the present invention, synchronizing signal is pixel synchronizing signal or line locking signal.
In a preferred embodiment of the present invention, the image selection element is a charge coupled cell.
The present invention also provides a kind of image selection element plate.This image selection element plate comprises AFE (analog front end) and sequential generator, and AFE (analog front end) and sequential generator are integrated in the integrated circuit, and the stationary problem of this integrated circuit and ASIC(Application Specific Integrated Circuit), send synchronizing signal to this integrated circuit by ASIC(Application Specific Integrated Circuit), and make the digital electric signal that is transmitted between this integrated circuit and the ASIC(Application Specific Integrated Circuit) can reach synchronous.
In a preferred embodiment of the present invention, the wait state time of synchronizing signal control timing generator is so that the digital electric signal that is transmitted between integrated circuit and the ASIC(Application Specific Integrated Circuit) can reach synchronous.
In a preferred embodiment of the present invention, synchronizing signal is pixel synchronizing signal or line locking signal.
In a preferred embodiment of the present invention, image selection element plate also comprises oscillator, is used to produce oscillator signal, and this oscillator signal is sent to clock generator, so that clock generator produces various sequential.
In a preferred embodiment of the present invention, AFE (analog front end) is used for converting analog electrical signal to digital electric signal, and digital electric signal is sent to ASIC(Application Specific Integrated Circuit).
In a preferred embodiment of the present invention, clock generator is used to produce the required various sequential of image selection element.
In a preferred embodiment of the present invention, image selection element plate also comprises oscillator, is used to produce oscillator signal, and this oscillator signal is sent to clock generator, so that clock generator produces various sequential.
In a preferred embodiment of the present invention, the image selection element is a charge coupled cell.
In sum, because AFE (analog front end) and sequential generator that image selection element plate of the present invention is comprised are integrated in the same integrated circuit, so be sent to from the image selection element AFE (analog front end) analog electrical signal the distance of process quite short, therefore can reduce the interference and the decay of analog signal.
For making above and other objects of the present invention, feature and advantage, can become apparent more, below just introduce the present invention in detail in conjunction with a preferred embodiment and accompanying drawing.
Description of drawings
Figure 1 shows that the mainboard in existing a kind of scanner and the functional block diagram of image selection element plate;
Figure 2 shows that the mainboard in a kind of scanner of a preferred embodiment of the present invention and the functional block diagram of image selection element plate; And
Figure 3 shows that the synchronizing signal transmitted between mainboard in a preferred embodiment of the present invention and the image selection element plate and the oscillogram of digital electric signal.
10,20: scanner
102,202: mainboard
104,204: image selection element version
106,206: ASIC(Application Specific Integrated Circuit)
108,216: AFE (analog front end)
110,208,214: oscillator
112,212: the image selection element
210: integrated circuit
218: clock generator
Embodiment
Please refer to Fig. 2, is the mainboard 202 in a kind of scanner 20 of a preferred embodiment of the present invention and the functional block diagram of image selection element plate 204 shown in the figure.As shown in Figure 2, mainboard 202 comprises ASIC(Application Specific Integrated Circuit) 206 and oscillator 208.And image selection element plate (for example being CCD board) 204 comprises integrated circuit 210, image selection element (for example being charge coupled cell) 212 and oscillator 214.Wherein, integrated circuit 210 comprises AFE (analog front end) 216 and sequential generator 218.To narrate the each several part function of image selection element plate 204 below.
Image selection element 212 is used to receive the light signal of gained when scanning file, and converts light signal to analog electrical signal.AFE (analog front end) 216 is used for converting analog electrical signal to digital electric signal, and digital electric signal is sent to ASIC(Application Specific Integrated Circuit) 206.Clock generator 218 is used to produce the required various sequential of image selection element 212.And oscillator 214 is used to produce oscillator signal, and this oscillator signal is sent to clock generator 218, so that clock generator 218 produces various sequential.Because be sent to from image selection element 212 AFE (analog front end) 216 analog electrical signal the distance of process quite short, therefore can reduce the interference and the decay of analog signal.In addition, ASIC(Application Specific Integrated Circuit) 206 is sent out synchronizing signal to integrated circuit 210, and makes the digital electric signal that is transmitted between integrated circuit 210 and the ASIC(Application Specific Integrated Circuit) 206 can reach synchronous.
The present invention is integrated in AFE (analog front end) 216 and sequential generator 218 among the integrated circuit 210, and integrated circuit 210 and ASIC(Application Specific Integrated Circuit) 206 are connected respectively to oscillator 214 and oscillator 208.Because the difference of the frequency of oscillator 214 and oscillator 208 or error can make the digital electric signal that is transmitted between integrated circuit 210 and the ASIC(Application Specific Integrated Circuit) 206 produce nonsynchronous situation, so the present invention uses the synchronizing signal that integrated circuit 206 is sent out to do Synchronous Processing.In this embodiment, synchronizing signal can be pixel synchronizing signal or line locking signal.The digital electric signal that is transmitted between integrated circuit 210 and the ASIC(Application Specific Integrated Circuit) 206 in addition, can utilize synchronizing signal to come the wait state time of control timing generator 218, so that can reach synchronous.For the purpose of clearer, please refer to Fig. 3, shown in the figure synchronizing signal of transmission and the oscillogram of digital electric signal between mainboard 202 and the image selection element plate 204 in a preferred embodiment of the present invention.In this embodiment, suppose that the frequency of oscillator 208 is 5MHz, and the frequency of oscillator 214 is 6MHz.Because the frequency of the digital electric signal that AFE (analog front end) 216 is sent out is 6MHz, faster than the frequency 5MHz of specific application integrated circuit 206, thus can make application integrated circuit 206 have little time to process, and produce the situation of digital electric signal error of transmission.As shown in Figure 3, the present invention utilizes the synchronizing signal of frequency for 5MHz, and make digital electric signal must postpone the one wait state period (even frequency becomes 5MHz), and make the digital electric signal that is transmitted between integrated circuit 210 and the ASIC(Application Specific Integrated Circuit) 206 can reach synchronous.
In sum, because AFE (analog front end) and sequential generator that image selection element plate of the present invention is comprised are integrated in the same integrated circuit, so be sent to from the image selection element AFE (analog front end) analog electrical signal the distance of process quite short, therefore can reduce the interference and the decay of analog signal.
Though the present invention is described in conjunction with preferred embodiment; so it is not to be used to limit the present invention, and any those skilled in the art is under the situation that does not break away from the spirit and scope of the present invention; can do various variations, thus protection scope of the present invention to should be claim described.
Claims (10)
1. an image selection element plate is coupled to an ASIC(Application Specific Integrated Circuit), comprising:
One image selection element is used to receive the light signal of gained when scanning a file, and converts this light signal to analog electrical signal; And
One integrated circuit is coupled to described image selection element and described ASIC(Application Specific Integrated Circuit), and described integrated circuit comprises:
One AFE (analog front end) is used for converting this analog electrical signal to digital electric signal, and this digital electric signal is sent to described ASIC(Application Specific Integrated Circuit); And
One sequential generator is coupled to described AFE (analog front end), is used to produce the required a plurality of sequential of described image selection element;
Described ASIC(Application Specific Integrated Circuit) is sent out a synchronous signal to described integrated circuit, makes the digital electric signal that is transmitted between described integrated circuit and the described ASIC(Application Specific Integrated Circuit) reach synchronous.
2. image selection element plate as claimed in claim 1, it is characterized in that described image selection element plate also comprises an oscillator, is used to produce an oscillator signal, this oscillator signal is sent to described clock generator, so that described clock generator produces these sequential.
3. image selection element plate as claimed in claim 1, it is characterized in that, described synchronizing signal is controlled one of described clock generator and is waited for the state time, makes the described digital electric signal that is transmitted between described integrated circuit and the described ASIC(Application Specific Integrated Circuit) reach synchronous.
4. image selection element plate as claimed in claim 1 is characterized in that, described synchronizing signal is a pixel synchronizing signal or a line locking signal.
5. image selection element plate, it is characterized in that, comprise an AFE (analog front end) and a sequential generator, and described AFE (analog front end) and described clock generator are integrated in the integrated circuit, and the stationary problem of a described integrated circuit and an ASIC(Application Specific Integrated Circuit), send out a synchronous signal to described integrated circuit by described ASIC(Application Specific Integrated Circuit), and make a digital electric signal that is transmitted between described integrated circuit and the described ASIC(Application Specific Integrated Circuit) reach synchronous.
6. image selection element plate as claimed in claim 5, it is characterized in that, described synchronizing signal is controlled one of described clock generator and is waited for the state time, so that the described digital electric signal that is transmitted between described integrated circuit and the described ASIC(Application Specific Integrated Circuit) reaches synchronous.
7. image selection element plate as claimed in claim 5 is characterized in that, described synchronizing signal is a pixel synchronizing signal or a line locking signal.
8. image selection element plate as claimed in claim 5 is characterized in that, described image selection element plate also comprises an image selection element, is used to receive a light signal of gained when scanning a file, and converts described light signal to an analog electrical signal.
9. image selection element plate as claimed in claim 8 is characterized in that described AFE (analog front end) is used for converting described analog electrical signal to described digital electric signal, and described digital electric signal is sent to described ASIC(Application Specific Integrated Circuit).
10. image selection element plate as claimed in claim 8 is characterized in that, described clock generator produces the required a plurality of sequential of described image selection element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031195040A CN1527579A (en) | 2003-03-05 | 2003-03-05 | Circuit board with image selecting elements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031195040A CN1527579A (en) | 2003-03-05 | 2003-03-05 | Circuit board with image selecting elements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1527579A true CN1527579A (en) | 2004-09-08 |
Family
ID=34285129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031195040A Withdrawn CN1527579A (en) | 2003-03-05 | 2003-03-05 | Circuit board with image selecting elements |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1527579A (en) |
-
2003
- 2003-03-05 CN CNA031195040A patent/CN1527579A/en not_active Withdrawn
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C04 | Withdrawal of patent application after publication (patent law 2001) | ||
| WW01 | Invention patent application withdrawn after publication |