CN102621775B - Imaging and lighting device and optical identifying equipment - Google Patents
Imaging and lighting device and optical identifying equipment Download PDFInfo
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- CN102621775B CN102621775B CN201210086691.2A CN201210086691A CN102621775B CN 102621775 B CN102621775 B CN 102621775B CN 201210086691 A CN201210086691 A CN 201210086691A CN 102621775 B CN102621775 B CN 102621775B
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Images
Abstract
The invention relates to an imaging and lighting device, which includes a light source (4), a uniform light plate (2) and a light guide pipe (3), wherein a lamp holder of the light source (4) is embedded in the uniform light plate (2); the light guide pipe (3) is arranged on one side of the uniform light plate (2); the uniform light plate (2) is used for enabling the light emitted from the light source (4) to be uniform; and the light guide pipe (3) is used for guiding the uniform light to an imaging surface (6). The invention also relates to optical identifying equipment, which includes a housing (5), an imaging module (1) arranged in the housing (5) and used for obtaining the optical image of the imaging surface (6) from a view finding window, and the imaging and lighting device arranged in the housing (5), wherein the light guide pipe (3) of the imaging and lighting device is opposite to the view finding window and lights the imaging surface (6) for the imaging module (1). The imaging and lighting device and the optical identifying equipment can enable the object plane illumination of rather a large area to be uniform, so as to prevent the highlighted part on the high-reflectivity surface from forming light spots and flare spots during the imaging process.
Description
Technical field
The present invention relates to lighting engineering, relate in particular to a kind of imaging lighting device and optical identification equipment.
Background technology
Along with scientific and technical development, can realize data message to recording on various media carries out digitized data and reads, these data messages are arranged on dielectric surface with the form of optical imagery conventionally, and user need to carry out reading of optical image information by special-purpose optical identification equipment.
Electronic pen is a kind of common optical identification equipment with less viewfinder range, as shown in Figure 1, this electronic pen has the shell 2a of interior section hollow, shell 2a is divided into two parts, a part is held camera head 7a, this camera head 7a comprises camera lens 6a and image sensor 8a, another part is tapered, in the cavity 3a of this tapering part, accommodate viewfinder window 1a, upper position in taper is also provided with light source 4a, the light 5a that this light source 4a launches can form illumination to dielectric surface, to facilitate camera head 7a to carry out reading of optical image information.Center on the lower at this tapering part is also provided with cylinder type hollow chamber, can play the light that light source 4a is sent and carry out the effect of diffusion homogenising.
Employing for medium, conventionally can use common paper, but also there is the paper that some are more senior, art paper for example, gold and silver paperboard, aluminium-foil paper, viscose papers etc. equally also can arrange data, but the electronic pen of introducing for Fig. 1, its viewfinder range is smaller, the image information reading is more limited, can only realize the uniform-illumination compared with small size, if and simply expand viewfinder window, be difficult to realize larger area uniform-illumination, the paper like this with high reflectance surface may produce due to the uneven irradiation of light source speck and solar flare, have influence on normally reading of optical image information, and then cause the deviation of Data Analysis.
Summary of the invention
The object of the invention is to propose a kind of imaging lighting device and optical identification equipment, can realize larger area object plane uniform-illumination, avoid the high light part on high reflectance surface in imaging process, to form speck and solar flare.
For achieving the above object, the invention provides a kind of imaging lighting device, comprise: light source (4), even tabula rasa (2) and light pipe (3), at least one lamp holder of described light source (4) embeds described even tabula rasa (2), described light pipe (3) is arranged on a side of described even tabula rasa (2), the light uniformization of described even tabula rasa (2) for described light source (4) is sent, described light pipe (3) is for being directed to imaging surface (6) by the light of described even tabula rasa (2) homogenising.
Further, described even tabula rasa (2) comprises reflector plate (205), light guide plate (206) and diffusion sheet (207), the lamp holder of described light source (4) is embedded in described light guide plate (206), with respect to described light guide plate (206), described reflector plate (205) is close to setting with described light guide plate (206) in the direction away from described imaging surface (6), for the light of described light guide plate (206) diffusion is reflexed in described light guide plate (206) again, described diffusion sheet (207) is close to setting with described light guide plate (206) in the direction of closing on described imaging surface (6), and described diffusion sheet (207) and described light pipe (3) adjacency, be used for the light scattering in described light guide plate (206) and be transmitted to described light pipe (3).
Further, the edge of described light guide plate (206) is provided with at least one outshot, and this outshot is provided with light source mounting hole (201), for embedding the lamp holder of described light source (4).
Further, at least one side of described light guide plate (206) is provided with and is a plurality of scattering points (202) that optical pattern is arranged.
Further, the side in described light guide plate (206) is provided with encapsulation reflectance coating (204).
Further, in described light guide plate (206), be also provided with imaging hole (203).
Further, described light pipe (3) is tubular light gatherer, and the shape of described light pipe (3) one end is consistent with the shape of the even tabula rasa (2) closing on, and the shape of described light pipe (4) other end is consistent with the shape of viewfinder window.
Further, the inwall (302) of described light pipe (3) is provided with mirror face reflection coating or diffuse reflection coating.
In technique scheme, light source is not directly imaging surface to be irradiated, but by the lamp holder of light source is embedded in even tabula rasa, the light uniformization that utilizes even tabula rasa that light source is sent, recycling light pipe is directed to imaging surface by the light of homogenising, completed the Uniform Illumination of imaging surface, the imaging surface high for reflectivity, area is large can be avoided the generation of speck and solar flare.
In an embodiment of the present invention, described even tabula rasa (2) comprises reflector plate (205), light guide plate (206) and diffusion sheet (207), the lamp holder of described light source (4) is embedded in described light guide plate (206), with respect to described light guide plate (206), described reflector plate (205) is close to setting with described light guide plate (206) in the direction away from described imaging surface (6), for the light of described light guide plate (206) diffusion is reflexed in described light guide plate (206) again, described diffusion sheet (207) is close to setting with described light guide plate (206) in the direction of closing on described imaging surface (6), and described diffusion sheet (207) and described light pipe (3) adjacency, be used for the light scattering in described light guide plate (206) and be transmitted to described light pipe (3).
By reflector plate, light guide plate, diffusion sheet is stacked and in the even tabula rasa that forms, light source is launched light by the lamp holder embedding in light guide plate, this light can spread in light guide plate, utilize diffusion sheet that the light in light guide plate is carried out to scattering and is transmitted to imaging surface, reflector plate can make light import light guide plate, improves the utilization factor of light.
In an embodiment of the present invention, the edge of described light guide plate (206) is provided with at least one outshot, and this outshot is provided with light source mounting hole (201), for embedding the lamp holder of described light source (4).Outshot at the edge of light guide plate embeds lamp holder, can avoid forming at imaging surface the reflection image of the hot spot of light source, is also convenient in addition the installation of light source.
In an embodiment of the present invention, at least one side of described light guide plate (206) is provided with and is a plurality of scattering points (202) that optical pattern is arranged.In light guide plate, arrange and be the scattering point that optical pattern arranges and the light that is mapped to scattering point can be diffuseed to form to scattered light to all angles.
In an embodiment of the present invention, at the side of described light guide plate (206), be provided with encapsulation reflectance coating (204).Encapsulation reflectance coating can make the light in light guide plate can not overflow from side, improves the light utilization efficiency of light source.
In an embodiment of the present invention, in described light guide plate (206), be also provided with imaging hole (203).For imaging modules and imaging surface, by the separated situation of light guide plate, can make imaging modules can get the optical imagery of imaging surface by imaging hole is set in light guide plate.
In an embodiment of the present invention, described light pipe (3) is tubular light gatherer, the shape of described light pipe (3) one end is consistent with the shape of the even tabula rasa (2) closing on, and the shape of described light pipe (4) other end is consistent with the shape of viewfinder window.Light pipe can be collected viewfinder window by the light of even tabula rasa homogenising, avoid the light of even tabula rasa institute outgoing to be diffused into the loss that light is caused in other places, and light guide plate has certain arrangement effect to the distribution of light, form the hot spot of the shape that is applicable to viewfinder window, the hollow structure of light pipe can also guarantee that uniform light that imaging surface is reflected back is smoothly by light pipe, and the camera lens that enters imaging modules carries out imaging.
In an embodiment of the present invention, the inwall (302) of described light pipe (3) is provided with mirror face reflection coating or diffuse reflection coating.Adopt mirror face reflection coating or diffuse reflection coating can further make to enter into light in light pipe by multiple reflections, the light that makes to shine viewfinder window is more even.
For achieving the above object, the invention provides a kind of optical identification equipment, comprising:
The shell (5) with viewfinder window,
Be arranged on the imaging modules (1) in shell (5), for obtain the optical imagery of imaging surface (6) from described viewfinder window;
Be arranged on the aforementioned arbitrary imaging lighting device in shell (5), the light pipe of described imaging lighting device (3) is relative with described viewfinder window, and is the illumination that described imaging modules (1) provides described imaging surface (6).
Further, be also provided with imaging hole (203) in the light guide plate of described imaging lighting device (206), the center of described imaging hole (203) is consistent with the entrance pupil center (102) of the camera lens (103) of described imaging modules (1).
Based on technique scheme, imaging lighting device of the present invention can be arranged on the inside of optical identification equipment, light pipe is directed to viewfinder window by the light of homogenising, imaging surface is thrown light on, imaging modules can be obtained the optical imagery of imaging surface, utilize the illumination of the light of homogenising can realize larger area object plane uniform-illumination, avoid the high light part on high reflectance surface in imaging process, to form speck and solar flare.
In an embodiment of the present invention, by imaging hole is set, and consistent mode is arranged to the entrance pupil center of camera lens in the center of imaging hole, make camera lens can better receive the uniform light that object plane is reflected back.
The various embodiments described above of imaging lighting device of the present invention can be widely used in all kinds of optical identification equipment.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the inner structure schematic diagram of electronic pen in prior art.
Fig. 2 is the structural representation of an embodiment of optical identification equipment of the present invention.
Fig. 3 a-3b is front view and the upward view of the concrete structure of imaging modules in Fig. 2 embodiment.
Fig. 4 a-4c is front view, vertical view and the left view of even tabula rasa in imaging lighting device embodiment of the present invention.
Fig. 5 a-5b is front view and the vertical view of light pipe in imaging lighting device embodiment of the present invention.
Description of reference numerals: 1, imaging modules; 2, even tabula rasa; 3, light pipe; 4, light source; 5, shell; 6, imaging surface; 101, printed circuit board (PCB) (pcb board); 102, the entrance pupil center of camera lens; 103, camera lens; 104, lens base; 105, light source solder joint; 106, imageing sensor (such as CMOS chip, CCD chip etc.); 201, light source mounting hole; 202, scattering point; 203, imaging hole; 204, encapsulation reflectance coating; 205, reflector plate; 206, light guide plate; 207, diffusion sheet; 301, receiving plane; 302, the inwall of light pipe; 303, exit facet.
Embodiment
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
For optical identification equipment, on height reflection object plane, to obtain larger area illumination, need in the structure of optical identification equipment, carry out the expansion on horizontal and vertical, but after enlarged areas, easily because of the unevenness of illumination, bring the problem of speck and solar flare, technical matters based on such, the embodiment that the present invention has provided a kind of optical identification equipment by Fig. 2 describes.
In the embodiment of Fig. 2, optical identification equipment at least comprises: shell 5, imaging modules 1 and imaging lighting device.On shell 5, have viewfinder window, the imaging modules 1 being conveniently arranged in shell 5 is obtained the optical imagery of imaging surface 6 from viewfinder window.Imaging lighting device is arranged in shell 5, for imaging modules 1 is provided as the illumination of image surface 6.
The concrete structure of imaging modules is referring to Fig. 3 a-3b, and imaging modules at least comprises printed circuit board (PCB) 101 (pcb board), lens base 104, camera lens 103 and imageing sensor 106 (for example CMOS chip or CCD chip).Printed circuit board (PCB) 101 is stuck on the inwall of shell 5, on printed circuit board (PCB) 101, be also fixed with lens base 104, on lens base 104, be provided with camera lens 103, be also provided with at least one light source solder joint 105 on printed circuit board (PCB) 101, this solder joint is realized being electrically connected between power supply and light source 4.In Fig. 3 b, the center of camera lens 3 is the entrance pupil center 102 of camera lens 3.Imageing sensor 106 is for carrying out the image inductor chip of opto-electronic conversion.
Imaging modules is not defined as the structure shown in Fig. 3 a-3b and corresponding assembly, and other imaging modules of the prior art are applicable to optical identification equipment of the present invention too, such as the imaging modules etc. that adopts CCD chip.
In embodiments of the present invention, imaging lighting device at least forms (referring to Fig. 2) by light source 4, even tabula rasa 2 and light guide plate 3, wherein at least one lamp holder of light source 4 embeds even tabula rasa 2, light pipe 3 is arranged on a side of even tabula rasa 2, the light uniformization of even tabula rasa 2 for light source 4 is sent, light pipe 3 is for being directed to imaging surface 6 by the light of even tabula rasa 2 homogenising.Light source 4 can adopt various visible light sources (such as red light source etc.) or non-visible light source (such as infrared light supply etc.).According to the difference of the lamp holder of light source 4, light source 4 can be point-like, wire or block light source.
Be different from the directly mode to imaging plane illumination of light source 4 of the prior art, imaging lighting device embodiment of the present invention is by being embedded into the lamp holder of light source in even tabula rasa, the light uniformization that utilizes even tabula rasa that light source is sent, recycling light pipe is directed to imaging surface by the light of homogenising, completed the Uniform Illumination of imaging surface, the imaging surface high for reflectivity, area is large can be avoided the generation of speck and solar flare.
As shown in Fig. 4 a-4c, be front view, vertical view and the left view of even tabula rasa in imaging lighting device embodiment of the present invention.Even tabula rasa 2 comprises reflector plate 205, light guide plate 206 and diffusion sheet 207, and the lamp holder of light source 4 is embedded in light guide plate 206.Preferably, at the edge of light guide plate 206, at least one outshot is set, in Fig. 4 b, be two outshots, at outshot, be provided with light source mounting hole 201, for embedding the lamp holder of light source 4, this embedded mode and structure can avoid forming at imaging surface the reflection image of the hot spot of light source, also more convenient installing of light source in addition.
The light that light source is launched can Multiple Scattering, reflection be realized the homogenising of light between reflector plate and diffusion sheet, and the horizontal area of light guide plate corresponding size can need to be set according to the area of viewfinder window, obtains the uniform light spots of the size of hope acquisition.
Side in light guide plate 206 can also arrange encapsulation reflectance coating 204, to prevent that light from overflowing from the side of light guide plate 206, thereby further improves the utilization factor of light.
In various optical identification apparatus embodiments, some imaging modules and viewfinder window are at the homonymy of even tabula rasa, and some imaging modules and viewfinder window are respectively in the both sides of even tabula rasa, like this for the imaging needs of imaging modules, can in light guide plate 206, offer imaging hole 203.The camera lens front end of imaging modules is placed in to imaging hole 203 places, imaging hole 203 center is arranged to consistent with the entrance pupil center 102 of the camera lens 103 of imaging modules, so just can better receive the light that object plane is reflected back.The pore size of imaging hole 203 can determine according to factors such as the focal length of imaging demand and camera lens, visual angles.
As shown in Fig. 5 a-5b, be front view and the vertical view of light pipe in imaging lighting device embodiment of the present invention.Light pipe 3 can have hollow structure for tubular light gatherer, and the shape of light pipe 3 one end (being receiving plane 301) is consistent with the shape of the even tabula rasa 2 closing on, and the shape of light pipe 3 other ends (being exit facet 303) is consistent with the shape of viewfinder window.Light pipe 3 has the collecting action of light, and the light of even tabula rasa 2 outgoing is brought to viewfinder window, and does not terminate in the loss that is diffused into other places and causes light.The distribution of 3 pairs of light of light pipe also has certain arrangement effect, can, according to the shape and size of the shape adjustments hot spot of exit facet 303, therefore can by changing the shape and size of exit facet 303, adjust the light spot shape in viewfinder window according to demand.For example foursquare hot spot just can obtain by foursquare exit facet 303 is set.
The hollow structure of light pipe can also guarantee that uniform light that imaging surface is reflected back is smoothly by light pipe, and the camera lens that enters imaging modules carries out imaging.
In addition, on the inwall 302 of light pipe 3, be also provided with mirror face reflection coating or diffuse reflection coating.Adopt mirror face reflection coating or diffuse reflection coating can further make to enter into light in light pipe by multiple reflections, the light that makes to shine viewfinder window is more even.
The embodiment of the above-mentioned imaging lighting device of introduction of the present invention can be widely used in various optical identification equipment, especially for large-scale optical identification equipment provides good imaging lighting environment.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; Although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characterictic is equal to replacement the specific embodiment of the present invention; And not departing from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention asks for protection.
Claims (8)
1. an imaging lighting device, it is characterized in that, comprise: light source (4), even tabula rasa (2) and light pipe (3), at least one lamp holder of described light source (4) embeds described even tabula rasa (2), described light pipe (3) is arranged on a side of described even tabula rasa (2), the light uniformization of described even tabula rasa (2) for described light source (4) is sent, described light pipe (3) is for being directed to imaging surface (6) by the light of described even tabula rasa (2) homogenising;
Described even tabula rasa (2) comprises reflector plate (205), light guide plate (206) and diffusion sheet (207), the lamp holder of described light source (4) is embedded in described light guide plate (206), with respect to described light guide plate (206), described reflector plate (205) is close to setting with described light guide plate (206) in the direction away from described imaging surface (6), for the light of described light guide plate (206) diffusion is reflexed in described light guide plate (206) again, described diffusion sheet (207) is close to setting with described light guide plate (206) in the direction of closing on described imaging surface (6), and described diffusion sheet (207) and described light pipe (3) adjacency, be used for the light scattering in described light guide plate (206) and be transmitted to described light pipe (3),
The edge of described light guide plate (206) is provided with at least one outshot, and this outshot is provided with light source mounting hole (201), for embedding the lamp holder of described light source (4).
2. imaging lighting device according to claim 1, is characterized in that, at least one side of described light guide plate (206) is provided with and is a plurality of scattering points (202) that optical pattern is arranged.
3. imaging lighting device according to claim 1, is characterized in that, at the side of described light guide plate (206), is provided with encapsulation reflectance coating (204).
4. imaging lighting device according to claim 1, is characterized in that, is also provided with imaging hole (203) in described light guide plate (206).
5. imaging lighting device according to claim 1, it is characterized in that, described light pipe (3) is tubular light gatherer, and the shape of described light pipe (3) one end is consistent with the shape of the even tabula rasa (2) closing on, and the shape of described light pipe (4) other end is consistent with the shape of viewfinder window.
6. imaging lighting device according to claim 5, is characterized in that, the inwall (302) of described light pipe (3) is provided with mirror face reflection coating or diffuse reflection coating.
7. an optical identification equipment, is characterized in that, comprising:
The shell (5) with viewfinder window,
Be arranged on the imaging modules (1) in shell (5), for obtain the optical imagery of imaging surface (6) from described viewfinder window;
Be arranged on the arbitrary described imaging lighting device of claim 1～6 in shell (5), the light pipe of described imaging lighting device (3) is relative with described viewfinder window, and is the illumination that described imaging modules (1) provides described imaging surface (6).
8. optical identification equipment according to claim 7, it is characterized in that, in the light guide plate of described imaging lighting device (206), be also provided with imaging hole (203), the center of described imaging hole (203) is consistent with the entrance pupil center (102) of the camera lens (103) of described imaging modules (1).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210086691.2A CN102621775B (en) | 2012-03-29 | 2012-03-29 | Imaging and lighting device and optical identifying equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210086691.2A CN102621775B (en) | 2012-03-29 | 2012-03-29 | Imaging and lighting device and optical identifying equipment |
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| CN102621775A CN102621775A (en) | 2012-08-01 |
| CN102621775B true CN102621775B (en) | 2014-04-16 |
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| US5877487A (en) * | 1995-06-21 | 1999-03-02 | Asahi Kogaku Kogyo Kabushiki Kaisha | Data symbol reading device |
| DE10240904A1 (en) * | 2002-09-04 | 2004-03-11 | Teachscreen Software Gmbh | Device for uniform illumination of object surfaces in close up photography for skin studies, has diffuser and spacer between flash lamp and object |
| CN101030245A (en) * | 2006-03-03 | 2007-09-05 | 富士通株式会社 | Image capturing apparatus |
| CN101320421A (en) * | 2008-07-23 | 2008-12-10 | 凌阳多媒体股份有限公司 | Optical reading head |
| CN101346729A (en) * | 2005-10-24 | 2009-01-14 | 科格内克斯科技和投资公司 | Integrated illumination assembly for symbology reader |
| CN101408927A (en) * | 2007-10-10 | 2009-04-15 | 凌阳多媒体股份有限公司 | Optical reading head with diffuseness structure |
| CN201945776U (en) * | 2010-12-28 | 2011-08-24 | 歌尔声学股份有限公司 | LED backlight display device |
| CN202631917U (en) * | 2012-03-29 | 2012-12-26 | 李卫伟 | Imaging lighting device and optical identification device |
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2012
- 2012-03-29 CN CN201210086691.2A patent/CN102621775B/en active Active
Patent Citations (8)
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|---|---|---|---|---|
| US5877487A (en) * | 1995-06-21 | 1999-03-02 | Asahi Kogaku Kogyo Kabushiki Kaisha | Data symbol reading device |
| DE10240904A1 (en) * | 2002-09-04 | 2004-03-11 | Teachscreen Software Gmbh | Device for uniform illumination of object surfaces in close up photography for skin studies, has diffuser and spacer between flash lamp and object |
| CN101346729A (en) * | 2005-10-24 | 2009-01-14 | 科格内克斯科技和投资公司 | Integrated illumination assembly for symbology reader |
| CN101030245A (en) * | 2006-03-03 | 2007-09-05 | 富士通株式会社 | Image capturing apparatus |
| CN101408927A (en) * | 2007-10-10 | 2009-04-15 | 凌阳多媒体股份有限公司 | Optical reading head with diffuseness structure |
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| CN201945776U (en) * | 2010-12-28 | 2011-08-24 | 歌尔声学股份有限公司 | LED backlight display device |
| CN202631917U (en) * | 2012-03-29 | 2012-12-26 | 李卫伟 | Imaging lighting device and optical identification device |
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| CN102621775A (en) | 2012-08-01 |
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