CN1464472A - Optical scanner having optical well - Google Patents
Optical scanner having optical well Download PDFInfo
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- CN1464472A CN1464472A CN 02122610 CN02122610A CN1464472A CN 1464472 A CN1464472 A CN 1464472A CN 02122610 CN02122610 CN 02122610 CN 02122610 A CN02122610 A CN 02122610A CN 1464472 A CN1464472 A CN 1464472A
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Abstract
The invention relates to an imaging device of an optical scanner module in an optical scanner characterized by that, an optical well imaging device is used to replace the traditional micro-lens imaging device for receiving the line image light source produced by the light source illuminating the scanning object. Further, the height of the non-sensing area on the optical sensor is sufficient to prevent the interference of other light sources, making the optical sensor can only receive part of the line light source and not being interfered. Therefore, by using an optical well imaging device to replace the traditional micro-lens imaging device, the light dispersion effect can be improved, and the image data can be completely focused on the optical sensor to obtain the optimum resolution and better modulation transfer function (MTF).
Description
Technical field
The present invention relates to a kind of optical scanner, imaging system in particularly a kind of optic scan module is to prevent optical dispersion effect (light dispersion effect) and to obtain best modulation transfer function (MTF, modulation transfer function), the optical scanner that promptly has optical well.
Background technology
General scanister (scanner device) is known by popular as falt bed scanner (flatbed scanner), and this falt bed scanner can produce the image data of machinery-can read, and this image data is represented the image data of sweep object.General in the application of scanner, image data with scanner scanning and the image that utilizes the object that personal computer is scanned with generation on display device, can be cathode-ray tube (CRT) (CRT, cathode ray tube) or printer in this display device.
Falt bed scanner (flatbed scanner) uses with computer system widely, makes the data of printing can convert signal of video signal (image signal) to.Optic scan module is one of most important composition assembly in the falt bed scanner.Generally speaking, optic scan module comprises the housing (housing) with an opening, this housing is in order to receive the light source that is transmitted by scanning document, in addition, also comprise an optical sensor (optical sensor), for example, charge-coupled device (CCD) (CCD, charge coupled device), this optical sensor is positioned at the housing inboard, and the light source that scanning document is transmitted converts corresponding signal of video signal to, and optic scan module also comprises a plurality of lens devices (lens) in addition, and this lens devices is that the light source that transmits is focused on optical sensor.
Typical falt bed scanner has comprised irradiation system (illumination) and optical system to finish the scanning of object.Irradiation system irradiation object (being commonly referred to as " scanning area " (scanregion)) partly, its optical system is to assemble to be irradiated to the light that scanning area reflects, and this pocket (being commonly referred to as " sweep trace " (scan line)) that is irradiated to scanning area is focused on the surface of an optical sensor that is positioned at this scanner.The image data of whole object can be obtained across crossing whole object by sweep trace, normally moves the image data signal that irradiation system and optical system obtain object with respect to object.
At this, irradiation system comprises light source, (as fluorescent lamp (fluorescent) or white lamp (incandescent) or light emitting diode (LED, light-emitting diode).Optical system comprises lens and/or minute surface shines the top of the image of sweep trace to detector surface with focusing.On the other hand, one " contact image sensor " (CIS, contact image sensor) also can be used for being assembled and focused light source above detector by the irradiation scanning area.
But the camera lens degree of depth of contact image sensor approximately has only 0.3 millimeter, and based on classic flat-plate formula optical scanner, this camera lens degree of depth is very difficult to guarantee that sweep object can focus on the contact image sensor.Even the less fabrication errors or the distortion of structure all can influence the quality of whole optics image pattern.
With reference to Figure 1A, wherein reference number 100 is a sweep object; Reference number 102 is reflection sources that light source irradiation sweep object 100 is produced afterwards; Reference number 104 is to be traditional lens imaging device; And reference number 106 is an optical sensor.In traditional optic scan module, be the optical image pattern to be focused on the optical sensor 106 according to image-forming principle, its reflection source 102 is sent to lens imaging device 104 by sweep object 100, then the optical image signal is sent on the optical sensor 106 again.Then, the optical image conversion of signals is become digital signal, and by output unit such as screen or printer output optical image pattern.
With reference to Figure 1B, reply distribution pattern (response distribution curvediagram) 200 via what lens imaging device 104 was sent to that optical sensor 106 produced according to reflection source among Figure 1A 102.In this response curve distribution pattern 200, because optical dispersion effect (lightdispersion effect), cause the two-end-point 202A and the 202B of the response curve that produced to be lower than the response curve that is produced by light source point 102C (linear light source) and other light source point (in Figure 1B, not representing) between two light source point 102A and 102B.In addition, because the optical dispersion effect, the resolution of the image data that is produced at two-end-point 202A and 202B is relatively poor, causes the resolution of whole image data not good.
Because lens imaging device 104 can cause the optical dispersion effect, makes the optical image pattern can't focus on optical sensor 106 tops completely.In addition, when reflection source 102 is sent to optical sensor 106 by sweep object 100, makes that resultant modulation transfer function after the scanning is relatively poor and can't obtain the resolution of preferable optical image pattern.
Summary of the invention
Fundamental purpose of the present invention is to overcome the deficiencies in the prior art and defective, provides an imaging device to replace traditional lens imaging device to save the manufacturing cost of optical scanner.
Another purpose of the present invention is to improve the optical dispersion effect that is produced when sweep object.
A further object of the present invention is to improve modulation transfer function (MTF, modulationtransfer function) to obtain best resolution (resolution).
According to the purpose of the above, the invention provides a kind of imaging device and utilize the optical scanner of lens devices as imaging device to replace tradition.In the present invention, an optical well imaging device (optical well imaging device) is used to replace the lens imaging device and is sent to optical sensor in order to transmit by the image light source that is produced after the irradiation sweep object.At this, the optical well imaging device has a plurality of optical gates (optical gate) and is positioned on the non-induction zone (non-inducted region) of optical sensor, when a plurality of optical gates are used to block for the imaging of optical image pattern, cause the part image light source of interference, make optical sensor can only receive the straight line image light source next from the front.Therefore, the image light source can intactly be sent to optical sensor improving the optical dispersion effect, and can obtain best resolution.
Description of drawings
Figure 1A represents that an image light source is sent to the optical scanner with a traditional lens imaging device;
Figure 1B represents the scatter chart of replying that produces according to Figure 1A;
Fig. 2 is according to device of the present invention, and expression has the structure calcspar of the optical scanner of an optical well imaging device;
Fig. 3 is according to device of the present invention, and expression optical well imaging device receives the synoptic diagram of a reflected light light beam; And
Fig. 4 is according to device of the present invention, and expression has the structural representation of the optic scan module of optical well imaging device.
Main symbol description among the figure
1 optical scanner, 2 light sources
3 optical well imaging devices, 4 optical sensors
5 analog-digital conversion systems, 6 Application Specific Integrated Circuit
7 correction databases, 8 scratch-pad memories
9 transmission interfaces, 10 main frames
11 output units, 20 sweep objects
22 image light sources, 24 non-induction zones
26 optical gates, 28 optical well imaging devices
30 optical sensors, 40 penetration scan modules
42 light sources, 50 reflective scanning mode modules
52 light sources, 60 image light sources
100 sweep objects, 102 reflection sources
102A light source point 102B light source point
102C light source point 104 lens imaging devices
106 optical sensors, 200 response curve distribution plans
202A end points 202B end points
The 202C end points
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with drawings and Examples.
Calcspar (block diagram) with reference to figure 2 expressions one optical scanning instrument apparatus.In this calcspar, optical scanner 1 utilizes light source 2 irradiation sweep objects (not in this expression).Then, be sent to imaging device 3 by the image light source 2 that is produced after the irradiation sweep object, as optical well imaging device (optical well imaging device), this optical well imaging device is used for replacing tradition with lens imaging device (lens-imaging device), make optical sensor 4 only can be received in the straight line image light source in optical sensor 4 the place aheads, to reduce problem by the interference that other light beam was caused.Therefore, can improve optical dispersion effect and the best modulation transfer function (MTF, modulation transfer function) of acquisition.
Then, image data is sent to analog-digital conversion system (ADC, analogy-digitalconvert system) 5, converts image data to digital signal.And then digital signal is sent to specific use integrated circuit (ASIC, application specific integrated circuit) 6, utilize in this specific use integrated circuit 5, different chipset (chip set) is to handle the desired function of user.When the capacity of whole image data can't finish in single treatment, then data partly temporarily can be stored into buffer (buffer) or be called (RAM in the scratch-pad memory, random access memory) 8, when this document of needs, can from scratch-pad memory 8, read and then send out via specific use integrated circuit 6.In addition, when signal need pass through aligning step, then can transmit signals in the correction database (calibrationdatabase) 7 and proofread and correct, to obtain the signal of a correction.And then with corrected signal via interface (interface) 9, as parallel serial port (parallel port), universal serial bus (Universal Serial Bus), minicomputer system interface (SCSI, Small ComputerSystem Interface) or utilize the host-host protocol of infrared transmission or the like image data or signal to be sent to the main frame (host) 10 of personal computer now, main frame 10 via personal computer transmits signals to output unit 11 again, as screen (monitor), printer (printer) or personal digital assistant (PDA, personal digital assistant) are with the image data of reading scan object.In this calcspar, except optical well imaging device 3, optical sensor 4, analog-digital conversion system 5 and specific use integrated circuit 6, remaining object can be called environment (article), optical scanner 1 utilizes these environment, increases the function of optical scanner 1 and improves the resolution of optical scanner sweep object and the quality of image output.
Then, with reference to figure 3, represent that an image light source (imaged light) 22 as reflective light source (reflected light) or penetration light source (transparent light) are sent to imaging device 28 and optical sensor 30 by sweep object 20, wherein optical sensor 30 can be contact image sensor (CIS, contact image sensor) or charge-coupled device (CCD, charge coupleddevice).In one embodiment of the invention, the optical well imaging device (optical well imaging device) 28 of (the optical gat) 26 that have a plurality of optical gates is provided, and each optical well 28 corresponds to each pixel (pixel) on the optical sensor 30, with replace tradition utilize lenticule (micro-lens) as imaging device to receive image data.In most preferred embodiment of the present invention, a plurality of optical gates 26 have a height and optical gate 26 and are positioned on the non-induction zone (non-inducted region) 24 of optical sensor 30 and can disturb the linear light source 22 that is entered optical sensor by optical sensor 30 the place aheads with the image light source that stops other, wherein a plurality of optical gate height need be high enough to stop the image light source 22 of other interference, and the width between a plurality of optical gate 26 equates and less than the size of each pixel on the corresponding to optical sensor 30.
According to above description, can know the image light source 22 that utilizes optical well 28 can receive directly to advance as imaging device, and the height of a plurality of optical gates 26 can block the image light source 22 of interference on the non-induction zone 24 of optical sensor 30, makes the image light source 22 of straight line can intactly be sent to optical imaging device 28 to transmit complete image data.When image data intactly by the (ADC of analog-digital conversion system, analogy-digital convert system) when converting digital signal to, its image data can intactly be presented on the output unit, make modulation transfer function (MTF, modulation transfer function) to improve and the resolution in image data when output can increase.
Then, Fig. 4 is the vertical view with optical scanner of an optical well imaging device 28.In Fig. 4, two optic scan modules are arranged, one is the penetration scan module (transparent scanningmodule) 40 that is used to scan penetration sweep object (transparent scanning object), and another is the reflective scanning mode module (reflected scanning module) 50 that is used for scanning reflection formula sweep object (reflected scanningobject).When scanning penetration sweep object 20, after light source 42 irradiation penetration sweep objects 20, produce an image light source 60, and be sent to optical well imaging device 28.Then its image data is sent to optical sensor 30 and image pattern is focused on the optical sensor 30.When scanning reflection formula sweep object 20, when light source 52 irradiation reflective scanning mode objects 20, produce image light source 60.Image light source 60 is sent to optical well imaging device 28 then, and image data is sent to optical sensor 30, simultaneously with complete the focusing on the optical sensor 30 of image data.
Can know no matter be penetration sweep object or reflective scanning mode object according to described above, when the image light source is sent to optical sensor, owing to there is optical gate to block the jamming light source of other direction, make its optical sensor receive only under the situation of linear light source, its image data can intactly focus on the optical sensor, and make the optical dispersion effect when scanning reach because optical sensor departs from the modulation transfer function that is produced and can improve, further, the resolution of its image pattern can significantly increase.
The above only is the present invention's preferred embodiment, is not in order to limit the present invention's claim; All other do not break away from following equivalence of finishing of disclosed spirit and changes or modification, all should be included in the scope of claims.
Claims (15)
1. an optical scanner is characterized in that, this optical scanner comprises:
One light source irradiation one scan object is to produce an image light source;
One imaging device receives this image light source; And
A plurality of optical gates allow light beam partly to enter on the optical sensor, wherein this a plurality of optical gates be positioned on the non-induction zone of this optical sensor and this optical sensor in order to reception this part image light source by this imaging device transmission.
2. optical scanner as claimed in claim 1 is characterized in that, above-mentioned image light source comprises a reflective light source.
3. optical scanner as claimed in claim 1 is characterized in that, above-mentioned image light source comprises a penetration light source.
4. optical scanner as claimed in claim 1 is characterized in that, above-mentioned imaging device is an optical well imaging device.
5. optical scanner as claimed in claim 1 is characterized in that, above-mentioned interval between a plurality of optical gates has identical width.
6. optics sweeping device as claimed in claim 5 is characterized in that, the width between above-mentioned a plurality of optical gates is less than each pixel of this optical sensor.
7. optical scanner as claimed in claim 1 is characterized in that, the height of an above-mentioned majority optical gate is used to block the jamming light source that is produced by other light beam.
8. optical scanner as claimed in claim 1 is characterized in that, more comprises an analog-digital conversion system to receive an image data that is sent by this optical sensor and to convert a digital signal to.
9. optical scanner as claimed in claim 1 is characterized in that, more comprises an Application Specific Integrated Circuit in order to receive this digital signal that is transmitted by this analog-digital conversion system and to handle this digital signal.
10. the optical scanner with optical well imaging device is characterized in that, this optical scanner comprises:
One light source irradiation one scan object is to produce an image light source;
One optical well imaging device is in order to receive this image light source;
A plurality of optical gates have the identical distance width and are positioned on the non-induction zone of this optical sensor and allow light beam partly to enter on the optical sensor, and wherein this a plurality of optical gates have one highly is enough to block this part image light source that the jamming light source that produced by other light beam and this optical sensor are transmitted by this optical well imaging device in order to reception;
One analog-digital conversion system converts this image data to a digital signal in order to receive by one of this optical sensor transmission image data; And
One Application Specific Integrated Circuit is used for receiving by this digital signal of this analog-digital conversion system transmission and handles this digital signal.
11. optical scanner as claimed in claim 10 is characterized in that, above-mentioned image light source comprises a reflective light source.
12. optical scanner as claimed in claim 10 is characterized in that, above-mentioned image light source comprises a penetration light source.
13. optical scanner as claimed in claim 10 is characterized in that, above-mentioned optical sensor is a contact image sensor.
14. optical scanner as claimed in claim 10 is characterized in that, above-mentioned optical sensor is a charge-coupled device.
15. optical scanner as claimed in claim 10 is characterized in that, the width between above-mentioned a plurality of optical gates is less than each pixel that is positioned on this optical sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02122610 CN1464472A (en) | 2002-06-19 | 2002-06-19 | Optical scanner having optical well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02122610 CN1464472A (en) | 2002-06-19 | 2002-06-19 | Optical scanner having optical well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1464472A true CN1464472A (en) | 2003-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02122610 Pending CN1464472A (en) | 2002-06-19 | 2002-06-19 | Optical scanner having optical well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1464472A (en) |
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2002
- 2002-06-19 CN CN 02122610 patent/CN1464472A/en active Pending
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Owner name: YUDONG TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: LIJIE COMPUTER CO., LTD. Effective date: 20051118 |
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Effective date of registration: 20051118 Address after: Taipei City, Taiwan, China Applicant after: Transpacific IP Pte Ltd. Address before: No. two, No. 1-1, R & D Park, Hsinchu Science Park, Taiwan Applicant before: Lijie Computer Co., Ltd. |
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