CN1773325A - Light gathering device for image scanning assembly - Google Patents
Light gathering device for image scanning assembly Download PDFInfo
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- CN1773325A CN1773325A CN 200410095780 CN200410095780A CN1773325A CN 1773325 A CN1773325 A CN 1773325A CN 200410095780 CN200410095780 CN 200410095780 CN 200410095780 A CN200410095780 A CN 200410095780A CN 1773325 A CN1773325 A CN 1773325A
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Abstract
The present invention provides a light-collecting device capable of gathering light source and guiding it onto scanned area. Said light-collecting device is made up by combining circular and elliptical arc reflecting surfaces, on these reflecting surfaces the light-reflecting sheets can be stuck or light-reflecting material can be plated so as to improve light intensity and light uniformity of scanned area. When the light is emitted from light source, the light can be collected and guided onto the scanned area, then can be imaged on the photosensitive component CCD or CMQS by means of scanned area.
Description
Technical field
The present invention is meant a kind of light collecting device of image scanning assembly, refers to a kind of light collecting device that can effectively improve the scanning plane luminous flux of injecting this image scanning assembly especially.
Background technology
The operation principles of employed image scanning assembly is that rayed that light source is sent is on the object that is scanned in image analyzer (scanner) or the multifunctional paper feeding machine (MFP), pass through then lens with light-ray condensing in charge coupled cell (CCD, charge coupled device) or on CMOS (the complementary metal oxidesemiconductor CMOS) photo-sensitive cell, signal transition with light is the signal of electricity again, and produces digital pixel (pixel) data; And general light source can be light emitting diode (LED), fluorescent lamp, cold-cathode tube (CCFL) or special lamp tube, as xenon fluorescent tube etc.
General image scanning assembly can be divided into two big classes, the first kind is the contact type image sensing component (CISM that is formed by combining with a group of photo-sensitive cell, lens pillar, light source and glass, contact image sensormodule), second class is charge-coupled device (CCD) assembly (CCDM, the charge coupled device module for utilizing sensing element, lens combination, reflector group, light source and glass etc. to be combined then; Lensreduction type).
See also Fig. 1, it is the synoptic diagram of aforesaid first kind image scanning assembly when scanning, wherein, image scanning assembly 10 is made of glass 11, light source 12, first light reflection surface 131, lens pillar 14, photo-sensitive cell 15, circuit board 16 and shell 17.This is the image scanning assembly of light source with the fluorescent tube, be by circular-arc or curve-like shape mostly on light collecting device as first light reflection surface 131, by the structure shown in the figure as can be known, only have effective light 181 of minority directly to be incident upon or reflexed to scanning area 19 by first light reflection surface 131,182 of a large amount of invalid light can't be led to scanning area 19.
See also Fig. 2, it is the synoptic diagram of image scanning assembly when the laggard line scanning of structural improvement of Fig. 1, wherein nearly all main element is all identical with Fig. 1, but be reflected and be incident upon the luminous flux of scanning area 29 in order to increase effective light 281, special second light reflection surface 232 that installs one plane (or curved surface shape) in the oblique upper of first light reflection surface 231 additional, yet, even so, the luminous flux of invalid light 282 still has space to be improved.
See also Fig. 3, it is the synoptic diagram of the aforesaid second class image scanning assembly when scanning, wherein, image scanning assembly 30 is made of glass 31, light source 32, first light reflection surface 331, lens 34, photo-sensitive cell 35, circuit board 36 and reflector group 37.Similarly, the light collecting device of this image scanning assembly 30 also is by the circular-arc or curve-like shape as first light reflection surface 331, therefore only have effective light 381 of minority directly to be incident upon or reflexed to scanning area 39 by first light reflection surface 331,382 of a large amount of invalid light can't be led to scanning area 39.
See also Fig. 4, it is the synoptic diagram of image scanning assembly when the laggard line scanning of structural improvement of Fig. 3, wherein nearly all main element is all identical with Fig. 3, but be reflected and be incident upon the luminous flux of scanning area 49 in order to increase effective light 481, special install second light reflection surface 432 of one plane (or curved surface shape) additional, but the luminous flux of invalid light 482 is still too high in the oblique upper of first light reflection surface 431.
See also Fig. 5, be illustrated as the light collecting device (light gathering apparatus of scanner) of a kind of scanner that United States Patent (USP) proposed for US2004/0080796A1 number, it is the light that light source 52 is sent, utilize special curved mirror 531 to convert directional light to, relend by other level crossing 532, concave-convex lens group 533 and be arranged at catoptron 534 on the image scanning assembly 50, make light can enter in the scanning area 59.
Therefore yet the needed optical element of the design of this kind light collecting device is more, and not only cost is higher and precision assembling is also strict; In addition, because the catoptron 534 of last a slice is to be positioned on the image scanning assembly 50 but the position of light source 52 is motionless, and light intensity is to become inverse square with the distance of light process, therefore when scanning, image scanning assembly 50 near with away from 52 two kinds of different situations of light source under, the received light intensities of scanning area 59 can be different; At last, this kind light collecting device is not considered the more weak problem of lamp tube ends light intensity, and the image quality that is obtained when therefore utilizing this kind light collecting device to scan also can't really satisfy required.
See also Fig. 6 (a) and Fig. 6 (b), it is the light collecting device that the Taiwan patent of the scanner of the light source component of application with self-light harvesting is proposed for TW563339 number for denomination of invention, it is to be coated with total reflection material 61 around luminous lamp tube 60 (light source) outside, and only stay a slit 62, when luminous lamp tube 60 inner generation light and outside the ejaculation, light can be by the total reflection material 61 of tube outer wall in the repeated reflection back and forth of fluorescent tube inside, penetrate via the slit 62 that is stayed at last, shown in Fig. 6 (a); In addition, this technology also increases the light intensity that secondary light source 63 increases both sides in luminous lamp tube 60 both sides, make whole brightness more even.
But this kind improvement mode is because of being the setting that coating total reflection material 61 is added secondary light source 63, therefore technical costs is also quite high, this UV light comes back reflective in the inside of luminous lamp tube 60, can cause the light absorbing energy of tube wall, cause luminous lamp tube 60 temperature to raise, cause assembly temperature to uprise and be out of shape, and then influence the image quality of photo-sensitive cell; In addition, also can't effectively be controlled by the light uniformity coefficient that slit 62 penetrates, the image quality that is obtained when therefore utilizing this kind light collecting device to scan also can't really satisfy required.
By the narration of all section of front as can be known, the light collecting device of the light source of at present general image scanning assembly, have only the light of small part can enter scanning area, the energy that can't should use up effectively improves the luminance brightness of scanning area, and other technology such as the US2004/0080796A1 (light collecting device of scanner, light gatheringapparatus of scanner) and TW563339 (application has the scanner of the light source component of self-light harvesting) disclose, manufacturing cost height not only, and its light source quality can't satisfy the demand of high-quality scanning again fully, thus these technology still difficulty be applied on the volume production product.
Summary of the invention
The light collecting device that proposes a kind of image scanning assembly that mainly is contemplated that of the present invention, be to utilize the ray-collecting that the reflecting surface of elliptic arc and circular arc will penetrate by light source and be directed to be scanned the zone, relend and enter vertically by scattering that scan components is inner to be captured light to photo-sensitive cell (CCD or COMS) and convert image to.
The present invention utilizes elliptic reflecting surface that two focuses are arranged, when light source is positioned over one of them focus, this focus is again the center of circle of circular arc reflecting surface, and another focal position of elliptic reflecting surface is to determine according to the refraction effect that is scanned face position and glass (cover glass); The light that light source is penetrated is divided into four groups, first group of light will be directly toward another focus direct projection, second group of light reflexes to another focus by elliptic reflecting surface, the 3rd group of light is run into the circular arc reflecting surface by the light source ejaculation and can be directed to another focus by elliptic reflecting surface again in the reflected back center of circle, the 4th group is invalid light, but the shared ratio of this group light is few, and utilizes the combination of the characteristic of elliptic reflecting surface and circular arc reflecting surface will effectively two, three groups ray guidance also effectively be increased the light intensity of scanning area to the required face that is scanned.
Present technique can attach reflector plate or be coated with reflecting material to improve the light intensity of reflection on elliptic reflecting surface or circular arc reflecting surface, and aspect the brightness lifting at two ends, then place the reflector plate or the high relatively reflecting material of coating of relative high reflectance in the two ends appropriate area, the light that increases two ends reflects and compensates the darker shortcoming in general lamp tube light source two ends, increases WBR in the homogeneity that is scanned face illumination.
The elliptic reflecting surface of present technique can directly design on the shell of scan components, when ejection formation, directly finish, and the circular arc reflecting surface can also be finished by shoot mode, be assembled in again on the shell of scan components, and this light collecting device also extendible be two groups, its position can be in being scanned the left and right sides, face below.
The present invention by in conjunction with following accompanying drawing to the detailed description of its preferred embodiment and can obtain more deep understanding.
Description of drawings
Fig. 1 is the synoptic diagram of image scanning assembly when scanning of prior art;
Fig. 2 is the synoptic diagram of image scanning assembly when the laggard line scanning of structural improvement of Fig. 1;
Fig. 3 is the synoptic diagram of another kind of image scanning assembly when scanning of prior art;
Fig. 4 is the synoptic diagram of image scanning assembly when the laggard line scanning of structural improvement of Fig. 3;
Fig. 5 is the light collecting device structural representation that United States Patent (USP) is proposed for US2004/0080796A1 number;
Fig. 6 (a) and 6 (b) are the light collecting device structural representations that the Taiwan patent is proposed for TW563339 number;
Fig. 7 is the structural representation of light collecting device first embodiment of image scanning assembly of the present invention;
Fig. 8 is the structural representation of light collecting device second embodiment of image scanning assembly of the present invention;
Fig. 9 is the structural representation of light collecting device the 3rd embodiment of image scanning assembly of the present invention; And
Figure 10 is the structural representation of light collecting device the 4th embodiment of image scanning assembly of the present invention.
Embodiment
See also Fig. 7, it is the structural representation of light collecting device first embodiment of image scanning assembly of the present invention, and employed technology is to make example with the contact type image sensing component among the figure.
In Fig. 7, image scanning assembly 70 is by glass (cover glass) 71, light source 72, elliptic reflecting surface 73, lens pillar (rod lense) 74, photo-sensitive cell 75, circuit board 76 and shell 77 constitute, light source 72 can be a fluorescent lamp, cold-cathode tube (CCFL) or special lamp tube (as xenon fluorescent tube etc.), elliptic reflecting surface 73 can be assembled, paste, spiral shell is solid, trip, latch or one-body molded mode are located at this shell, and can attach on demand on the elliptic reflecting surface 73 different reflectivity reflecting piece or the coating different reflectivity material, make the illumination and the uniformity coefficient of scanning area 79 (so-called scanning area is meant that generally to be positioned at this on glass, but the situation with this glass partition one distance is also arranged) can meet different demands herein.
Because elliptic reflecting surface 73 has two elliptic focus, and the position of light source 72 elliptic focus just in time located therein then must cooperate the thickness of scanning area 79, glass 71, the refractive index of glass 71 and the actual demand of image scanning assembly 70 to do suitably to adjust as for another elliptic focus.
By this design, most light that is sent by light source 72 can converge at another elliptic focus (that is scanning area 79) via the reflection of elliptic reflecting surface 73 and form effective light 781, and the luminous flux of invalid light 782 is then few.
Certainly, do the example with the contact type image sensing component, can also use aspect the charge-coupled device (CCD) assembly except above-mentioned.
See also Fig. 8, it is the structural representation of light collecting device second embodiment of image scanning assembly of the present invention, with first embodiment of Fig. 7 comparatively difference be, as used herein except elliptic reflecting surface 831, also add a circular arc reflecting surface 832, wherein the center of circle of circular arc reflecting surface 832 must overlap with a wherein focus of elliptic reflecting surface 831, in addition, also in wherein having added one group of reflector group 842, reflexing to lens 841 by the light that elliptic reflecting surface 831 and circular arc reflecting surface 832 reflex to scanning area 89.
Similarly, by this design, most light that is sent by light source 82 can gather via the reflection of elliptic reflecting surface 831 and circular arc reflecting surface 832 in another elliptic focus (that is scanning area 89) and forms effective light 881, the luminous flux of invalid light is then few, in addition, this embodiment also can be applicable on the contact type image sensing component.
See also Fig. 9, it is the structural representation of light collecting device the 3rd embodiment of image scanning assembly of the present invention, with second embodiment of Fig. 8 comparatively difference be, as used herein except elliptic reflecting surface 931, also add two circular arc reflectings surface 932,933, wherein the circular arc reflecting surface 932 and 933 the center of circle all must overlap with a wherein focus of elliptic reflecting surface 931, and reflector group 942 then is that the light that will reflex to scanning area 99 by elliptic reflecting surface 931 and circular arc reflecting surface 932,933 reflexes to lens 941.
By this design, most light that is sent by light source 92 can gather in another elliptic focus (that is scanning area 99) via the reflection of elliptic reflecting surface 931 and circular arc reflecting surface 932,933 and forms effective light 981, the luminous flux of invalid light is then few, this embodiment can be converted to effective light 981 with more invalid light, can make the illumination of scanning area 99 improve more.
Though present embodiment is with CCDM as an example, same technology also can be applicable in the occasion of CISM.
See also Figure 10, it is the structural representation of light collecting device the 4th embodiment of image scanning assembly of the present invention, be with aforesaid three embodiment differences, be to use 1031,1032 and two circular arc reflectings surface 1033,1034 of two elliptic reflecting surfaces herein, wherein the circular arc reflecting surface 1033 and 1034 the center of circle are to overlap with a wherein focus of elliptic reflecting surface 1031,1032 respectively, and light source 1021 and 1022 then lays respectively at the center of circle of circular arc reflecting surface 1033 and 1034.
Similarly, by this design, most by light source 1021,1022 light that sent can be respectively via elliptic reflecting surface 1031 and circular arc reflecting surface 1033, and the reflection of elliptic reflecting surface 1032 and circular arc reflecting surface 1034 converges at the effective light 1081 of another elliptic focus (that is scanning area 99) formation, the luminous flux of invalid light is then few, this embodiment is when image scanning assembly 100 needs higher illumination, utilize two lamp tube light sources 1021,1022 o'clock light collecting device, this embodiment can make scanning area 109 illumination brighter, sweep velocity can be faster, undoubtedly, present embodiment still can be applicable in the occasion of CISM.
The light collecting device of image scanning assembly of the present invention is the together circle center that light source is put in elliptic reflecting surface and circular arc reflecting surface, utilizes the reflection characteristic of elliptic reflecting surface and circular arc reflecting surface, and invalid ray-collecting and guiding are entered scanning area.This design will significantly promote the illumination of scanning area, and the improvement of lamp tube ends uniformity coefficient can utilize the difference of the reflectivity of two ends reflecting surface to adjust whole uniformity coefficient, the lifting of illumination and uniformity coefficient will help make in sweep velocity accelerate, the scanning quality change is good; In addition, guiding device can combine with the scan components structure and design, and comes moulding with shoot mode, helps the miniaturization and the production of scan components, and significantly reduces manufacturing cost.
Claims (10)
1. the light collecting device of an image scanning assembly, this image scanning assembly has one scan zone, lens and a photo-sensitive cell at least, and this light collecting device comprises:
At least one elliptic reflecting surface has one first elliptic focus;
At least one circular arc reflecting surface has a center of circle, and this center of circle coincides with this first elliptic focus; And
At least one light source is positioned at this first elliptic focus, and the light that this light source sends converges at this photo-sensitive cell via these lens after reflexing to this scanning area by this elliptic reflecting surface and this circular arc reflecting surface.
2. light collecting device as claimed in claim 1 is characterized in that this image scanning assembly is a contact type image sensing component.
3. light collecting device as claimed in claim 2 is characterized in that these lens are a lens pillar.
4. light collecting device as claimed in claim 1 is characterized in that this image scanning assembly is a charge-coupled device (CCD) assembly.
5. light collecting device as claimed in claim 4 is characterized in that also comprising a reflector group, will reflex to this lens by the light that this elliptic reflecting surface and this circular arc reflecting surface reflex to this scanning area.
6. light collecting device as claimed in claim 1 is characterized in that:
This light collecting device also comprises a glass, this scanning area be positioned at this on glass or with this glass partition one distance; And/or
This elliptic reflecting surface has one second elliptic focus, and this second elliptic focus is to adjust according to this scanning area, the thickness of this glass, the refractive index of this glass and the actual demand of this scan components.
7. described light collecting device as claimed in claim 1 is characterized in that this light collecting device also comprises a shell, and this elliptic reflecting surface and this circular arc reflecting surface are to be located at this shell with assembling or one-body molded mode.
8. described light collecting device as claimed in claim 1 is characterized in that also forming at least one reflective material layer on this elliptic reflecting surface and this circular arc reflecting surface of whole or part.
9. described light collecting device as claimed in claim 1 is characterized in that this light source is a fluorescent lamp, cold-cathode tube, xenon fluorescent tube or other kind fluorescent tubes.
10. the light collecting device of an image scanning assembly, this image scanning assembly has one scan zone, lens and a photo-sensitive cell at least, and this light collecting device comprises:
At least one elliptic reflecting surface has one first elliptic focus; And
At least one light source is positioned at this first elliptic focus, this light source sends only reflex to this scanning area by this elliptic reflecting surface after, converge at this photo-sensitive cell via these lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410095780 CN1773325A (en) | 2004-11-12 | 2004-11-12 | Light gathering device for image scanning assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410095780 CN1773325A (en) | 2004-11-12 | 2004-11-12 | Light gathering device for image scanning assembly |
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| Publication Number | Publication Date |
|---|---|
| CN1773325A true CN1773325A (en) | 2006-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410095780 Pending CN1773325A (en) | 2004-11-12 | 2004-11-12 | Light gathering device for image scanning assembly |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101668986B (en) * | 2007-04-24 | 2012-02-22 | 皇家飞利浦电子股份有限公司 | Luminaire and reflector |
| CN103891262A (en) * | 2011-10-25 | 2014-06-25 | 三菱电机株式会社 | Lighting unit and image scanner using same |
| CN103907337A (en) * | 2011-10-25 | 2014-07-02 | 三菱电机株式会社 | Lighting unit and image scanner using the same |
| CN105444046A (en) * | 2014-09-24 | 2016-03-30 | 信泰光学(深圳)有限公司 | Optical mechanism with even point light source strip |
| CN108131574A (en) * | 2018-02-09 | 2018-06-08 | 天津海达奥普光电技术股份有限公司 | A kind of high efficiency LED directional lights irradiate linear light sorurce |
| CN111931540A (en) * | 2020-09-16 | 2020-11-13 | 苏州斯普锐智能***有限公司 | Improve sweep a yard device of sweeping of a yard lighting efficiency |
-
2004
- 2004-11-12 CN CN 200410095780 patent/CN1773325A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101668986B (en) * | 2007-04-24 | 2012-02-22 | 皇家飞利浦电子股份有限公司 | Luminaire and reflector |
| CN103891262A (en) * | 2011-10-25 | 2014-06-25 | 三菱电机株式会社 | Lighting unit and image scanner using same |
| CN103907337A (en) * | 2011-10-25 | 2014-07-02 | 三菱电机株式会社 | Lighting unit and image scanner using the same |
| CN103907337B (en) * | 2011-10-25 | 2016-08-24 | 三菱电机株式会社 | Lighting unit and use the image read-out of this lighting unit |
| CN105444046A (en) * | 2014-09-24 | 2016-03-30 | 信泰光学(深圳)有限公司 | Optical mechanism with even point light source strip |
| CN105444046B (en) * | 2014-09-24 | 2019-02-12 | 信泰光学(深圳)有限公司 | The optical facilities of point light source item homogenization |
| CN108131574A (en) * | 2018-02-09 | 2018-06-08 | 天津海达奥普光电技术股份有限公司 | A kind of high efficiency LED directional lights irradiate linear light sorurce |
| CN111931540A (en) * | 2020-09-16 | 2020-11-13 | 苏州斯普锐智能***有限公司 | Improve sweep a yard device of sweeping of a yard lighting efficiency |
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