CN103685833B - Lighting apparatus, image sensor cell and paper type recognition - Google Patents
Lighting apparatus, image sensor cell and paper type recognition Download PDFInfo
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- CN103685833B CN103685833B CN201310404403.8A CN201310404403A CN103685833B CN 103685833 B CN103685833 B CN 103685833B CN 201310404403 A CN201310404403 A CN 201310404403A CN 103685833 B CN103685833 B CN 103685833B
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Abstract
Lighting apparatus, image sensor cell and paper type recognition.This lighting apparatus comprises: the light source sending the light of multi-wavelength; With the bar-shaped light guide of the light shape will sent by light source, wherein, light conductor is made up of the material comprising the inconstant region of the transmissivity of wavelength, light source is configured at one end in a longitudinal direction of light conductor, light source comprises the wavelength to the inconstant region of the transmissivity of light conductor, and reflecting surface is formed at the other end in a longitudinal direction of light conductor, and this reflecting surface comprises the reflecting member light of multi-wavelength to difference in reflectivity.
Description
Related application
The application based on and the priority of the Japanese patent application No.2013-141003 submitted to 4, on July at first Japanese patent application No.2012-197563 and 2013 requiring on September 7th, 2012 to submit to, its full content is incorporated herein by reference.
Technical field
The present invention relates to lighting apparatus, image sensor cell and paper type recognition.More particularly, the present invention relates to the lighting apparatus of the light of the multi-wavelength sending such as visible ray and infrared light etc., comprise the image sensor cell of this lighting apparatus and comprise the paper type recognition of this image sensor cell.
Background technology
Some image sensor cells of reading images comprise the bar-shaped light guide making the light shape sent by the point-source of light of such as LED etc.In the structure of light source with the one end being configured in light conductor longitudinal direction, the illumination intensity of the light sent from light conductor may reduce towards the end of opposition side.Patent documentation 1 and patent documentation 2 disclose the light conductor on the inclined plane comprising certain angle, and this inclined plane does not allow light transmission, and inclined plane is formed at the end of the opposition side at light source.According to this structure, arrive the light of the end of the opposition side of light source by the illumination intensity of light reflecting to increase near end.This can make the Illumination Distribution of the light throughout whole light conductor even.
The image sensor cell of reading images is also applied to the true and false paper type recognition determining bank note etc.True and false in order to determine, bank note comprises regions different with the image obtained under infrared light under visible light.Therefore, the image sensor cell being applied to paper type recognition can send visible ray and infrared light to read visible images and the infrared light image of bank note to bank note.
Patent documentation 1: Japanese Unexamined Patent Publication 2006-85975 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2007-183470 publication
According to the material that light conductor uses, the spectral-transmission favtor of light conductor can be different.Therefore, if the transmissivity of infrared light is lower than the transmissivity of visible ray, then compared with the illumination intensity of visible ray, the illumination intensity of the infrared light sent from light conductor reduces towards the end of opposition side.Therefore, the Illumination Distribution being mapped to the infrared light of bank note is tending towards uneven.As a result, the reading accuracy of infrared light image may be reduced.
Summary of the invention
In view of the foregoing, the object of the invention is to provide uniform Illumination Distribution to the light of the wavelength with low transmissivity in light conductor.
In order to solve this problem, the invention provides a kind of lighting apparatus, it comprises: light source, and it comprises multiple light-emitting components of the light sending different wave length; And bar-shaped light guide, its light shape will sent by described light source, wherein, described light source is configured at one end in a longitudinal direction of described light conductor, described light conductor is made up of the inconstant material of the transmissivity of the light of the different wave length sent described light source, and the reflecting surface being provided with reflecting material is formed at the other end in a longitudinal direction of described light conductor, the light of described reflecting material to different wave length has difference in reflectivity.
The invention provides a kind of image sensor cell, it comprises: light source, and it comprises multiple light-emitting components of the light sending different wave length; Bar-shaped light guide, its light shape will sent by described light source; Condensing body, it assembles the light from irradiated body; And imageing sensor, the reverberation that its reception is assembled by described condensing body is to convert described reverberation to the signal of telecommunication, wherein, described light source is configured at one end in a longitudinal direction of described light conductor, described light conductor is made up of the inconstant material of the transmissivity of the light of the different wave length sent described light source, and the reflecting surface being provided with reflecting material is formed at the other end in a longitudinal direction of described light conductor, the light of described reflecting material to different wave length has difference in reflectivity.
The invention provides a kind of paper type recognition, it comprises image sensor cell and under the state making the relatively movement of image sensor cell and irradiated body, reads the light from described irradiated body.
Accompanying drawing explanation
Fig. 1 is the schematic, exploded of the structure of lighting apparatus 1;
Fig. 2 is the arrow M direction view of II part in Fig. 1;
Fig. 3 is the example graph of the relation between the reflectivity of the spectral intensity of light source 11, the transmissivity of light conductor 12 and reflecting surface 123;
Fig. 4 is the schematic, exploded of the structure of the lighting apparatus 1 of the reflecting member 13 comprised independent of light conductor 12;
Fig. 5 is the schematic, exploded of the structure of image sensor cell 3;
Fig. 6 is the schematic sectional view of the internal structure of image sensor cell 3, shows the cross section along the planar interception vertical with main scanning direction;
Fig. 7 is the schematic sectional view of the structure of paper type recognition 5, shows the cross section along the planar interception vertical with main scanning direction;
Fig. 8 is the schematic sectional view of the structure of the paper type recognition 5 also comprising transmission illumination equipment 52;
Fig. 9 is the schematic sectional view of the structure of the paper type recognition 5 comprising two groups of image sensor cells 3;
Figure 10 A is the curve chart of the Illumination Distribution of the lighting apparatus illustrated according to comparative example, and this lighting apparatus does not comprise the reflecting surface with wavelength selectivity in the opposition side of the plane of incidence of light conductor;
Figure 10 B is the curve chart of the Illumination Distribution of the lighting apparatus illustrated according to comparative example, and this lighting apparatus comprises the aluminium film of the reflector as reflecting surface;
Figure 10 C is the curve chart of the Illumination Distribution that lighting apparatus 1 is according to an embodiment of the invention shown;
Figure 11 is the curve chart of the spectral-transmission favtor that acrylic resin is shown;
Figure 12 is the partial enlarged drawing of the spectral-transmission favtor that acrylic resin is shown.
Embodiment
Now, embodiments of the present invention are described in detail with reference to the accompanying drawings.Embodiments of the present invention comprise lighting apparatus 1, comprise the image sensor cell 3 of lighting apparatus 1 and comprise the paper type recognition 5 of image sensor cell 3.In the accompanying drawings, three-dimensional will be represented by arrow X, Y and Z.X-direction is the main scanning direction of image sensor cell 3.Y-direction is the sub scanning direction of image sensor cell 3.Z-direction is the above-below direction of image sensor cell 3.
In embodiments of the present invention, " light " not only comprises visible ray, is also included in the electromagnetic wave (such as, the wavelength of region of ultra-red and ultraviolet region) of the wavelength beyond visible ray.
(lighting apparatus)
The structure of lighting apparatus 1 is described with reference to Fig. 1 and Fig. 2.Fig. 1 is the schematic, exploded of the structure of lighting apparatus 1.Fig. 2 is the arrow M direction view of II part in Fig. 1.Illustrate after a while when being incorporated into image sensor cell 3() in, lighting apparatus 1 sends visible ray and infrared light to the bank note P as irradiated body (paper).
As shown in Figure 1, lighting apparatus 1 comprises light source 11 and light conductor 12.
Light source 11 and plane of incidence 121(illustrate after a while) configure at interval, the plane of incidence 121 is light conductor 12 end faces on main scanning direction (longitudinal direction), and light source 11 sends light to the plane of incidence 121 of light conductor 12.Light source 11 comprises and such as sends the light-emitting component of light that the wavelength lighted successively is red (R), green (G), blue (B) and infrared (Ir).Light-emitting component can be various known LED.The circuit board 33(that light source 11 is installed to image sensor cell 3 illustrates after a while) upper surface (upper surface in Z-direction).
Light conductor 12 is by the optical component of the light shape sent by light source 11.Light conductor 12 is made up of the transparent resin material of such as acrylic resin etc., and is formed by injection moulding etc.Light conductor 12 has club shaped structure elongated on main scanning direction on the whole.
As shown in Figure 1, the end face of light conductor 12 on main scanning direction is the plane of incidence 121, and the light sent by light source 11 enters from the plane of incidence 121.
As shown in Figure 2, light conductor 12 another end face on main scanning direction is reflecting surface 123, and this reflecting surface 123 reflects the light sent by light source 11.The light reflectance of other wavelength of light reflectance comparison of reflecting surface 123 pairs of specific wavelengths is high.Such as, reflecting surface 123 is provided with the film of the reflector 125 as reflection part, and this reflection part is high to the reflectivity of the luminance factor of specific wavelength to other wavelength.
As depicted in figs. 1 and 2, exit facet 122 and diffusing surface 124 are formed at the side of light conductor 12.
Exit facet 122 is the faces light entered from the plane of incidence 121 and the light that reflected by reflecting surface 123 being transmitted into bank note P.Exit facet 122 has the elongated belt shape extended along main scanning direction.Light is transmitted into the reading line O(of bank note P see Fig. 6 to Fig. 9 by exit facet 122).Therefore, such as, exit facet 122 has the curved surface of the reading line O projection towards bank note P.
According to the size of size setting exit facet 122 on main scanning direction of bank note P.Such as, image sensor cell 3 reads under the state of the longitudinal direction relative movement along bank note P, and sets the size of exit facet 122 on main scanning direction according to the short side dimension of bank note P.
Diffusing surface 124 is the light irreflexive making to enter from the plane of incidence 121.Diffusing surface 124 is formed in the face of exit facet 122.Such as, multiple prism-like diffusion portion with required gap-forming in diffusing surface 124.Be interposed between multiple diffusion portion on main scanning direction and diminish to the other end (close to reflecting surface 123) from one end (close to the plane of incidence 121).
Diffusion portion can be such as the printed patterns be made up of the reflecting coating being generated by silk screen printing etc.In this case, the density of printed patterns reduces along with the reduction of the distance apart from the plane of incidence 121, and increases along with the increase of the distance apart from the plane of incidence 121.This structure can prevent or suppress the uneven of the Illumination Distribution of the light sent from exit facet 122.Especially, this structure can prevent or suppress the illumination intensity of light to reduce along with the increase of the distance apart from the plane of incidence 121, and can prevent or suppress the uneven of the Illumination Distribution of the light throughout whole light conductor 12.
The effect of the reflecting surface for reverberation is played in other faces of the outer peripheral face of light conductor 12.
The feature of reflecting surface 123 is described with reference to Fig. 3.The film of reflector 125 is formed at reflecting surface 123, and the film reverberation of reflector 125.Fig. 3 is the example graph of the relation between the reflectivity of the reflector 125 of the spectral intensity of light source 11, the transmissivity of light conductor 12 and reflecting surface 123.
The spectral-transmission favtor being coated to the resin material of light conductor 12 changes according to wavelength.More specifically, light conductor 12 is formed by the material comprising the inconstant wavelength region may of transmissivity.Such as, the transmissivity of acrylic resin to the transmissivity comparison visible ray (R, G and B coloured light sent by light source 11) of infrared light is low.Therefore, when light source 11 is configured at one end on main scanning direction of light conductor 12, the illumination intensity of the infrared light near the other end of light conductor 12 on main scanning direction is lower than the illumination intensity of visible ray.As a result, the Illumination Distribution throughout whole light conductor 12 of infrared light is uneven.On the other hand, when the film of the reflector 125 of the light of reflection all wavelengths is formed at the reflecting surface 123 of the other end on the longitudinal direction being configured in light conductor 12, the Illumination Distribution of infrared light can be made even, but the illumination intensity of the visible ray near reflecting surface 123 increase.As a result, the Illumination Distribution throughout whole light conductor 12 is uneven.
Like this, when light conductor 12 is made up of the material that the transmissivity of the light of other wavelength of transmissivity comparison of the light to specific wavelength is low, be difficult to the uniform illuminance of the uniform illuminance of the light (being infrared light) obtaining specific wavelength and the light (being visible ray) of other wavelength here here.
Therefore, be formed at reflecting surface 123 to the film of the high reflector 125 of the light reflectance of other wavelength of light reflectance comparison of specific wavelength, reflecting surface 123 is end faces of the opposition side of the plane of incidence 121 of light conductor 12.More specifically, because the transmissivity of the transmissivity comparison visible ray of light conductor 12 pairs of infrared lights is low, so be formed at the reflecting surface 123 of light conductor 12 to the luminance factor of the infrared light film to the high reflector 125 of visible light reflectance.
According to this structure, to enter and the infrared light arriving reflecting surface 123 to be reflected by reflecting surface 123 and penetrates from exit facet 122 from the plane of incidence 121.This can prevent the illumination intensity of infrared light from reducing along with the increase of the distance apart from the plane of incidence 121, and the Illumination Distribution of infrared light can be made even.
On the other hand, to enter and the visible ray arriving reflecting surface 123 is reflected according to the reflectivity of reflector 125 by reflecting surface 123 or absorbs from the plane of incidence 121.This can prevent the illumination intensity of visible ray from increasing near the end of reflecting surface, and the Illumination Distribution of visible ray can be made even.
This can obtain the uniform illuminance of infrared light and the uniform illuminance of visible ray throughout whole light conductor 12.
Like this, by comprise reflectivity (or absorptivity) difference, the film of reflector 125 that the reflecting material with wavelength selectivity is made is formed the example of the reflection part on reflecting surface 123.Such as, coating can be adopted as the structure (forming the structure of film) with the coating of this feature of reflecting material.The various known coating of such as infrared reflection pigment can be used as this coating.
Selectively, can comprise the reflecting member 13 as the example of reflection part, this reflecting member 13 contains reflecting material and is formed independent of light conductor 12.Fig. 4 is the schematic, exploded of the structure of the lighting apparatus 1 of the reflecting member 13 comprised independent of light conductor 12.As shown in Figure 4, light source 11 is configured at light conductor 12 one end on main scanning direction, and reflecting member 13 is configured in the other end.Reflecting member 13 has the surface characteristic identical with reflector 125.Such as, there is plate etc. as above that be coated with as the coating of reflecting material and be used as reflecting member 13.The reflecting surface 123 of light conductor 12 faced by reflecting member 13 is configured to or contact reflex face 123.According to this structure, the infrared light being transmitted into the outside of light conductor 12 from the reflecting surface 123 of light conductor 12 is reflected by reflecting member 13 and again enters light conductor 12.Therefore, it is possible to obtain identical beneficial effect.
(image sensor cell)
The structure of image sensor cell 3 is described with reference to Fig. 5 and Fig. 6.Fig. 5 is the schematic, exploded of the structure of image sensor cell 3.Fig. 6 is the schematic sectional view of the internal structure of image sensor cell 3, shows the cross section along the planar interception vertical with main scanning direction.Image sensor cell 3 can based on the image reading bank note P from the visible ray of bank note P and infrared light.
Image sensor cell 3 comprises lighting apparatus 1, frame 31, condensing body 32, circuit board 33 and lid component 35.Imageing sensor 34 is configured at the upper surface of circuit board 33.
Frame 31 is housings of image sensor cell 3.Frame 31 has club shaped structure, and is such as formed by the shading resin material of black.Such as, Merlon can be used as resin material.Top in the Z-direction of frame 31, forms the light conductor receiving room 311 can receiving the light conductor 12 of lighting apparatus 1 and the condensing body receiving room 312 can receiving condensing body 32.Bottom in the Z-direction of frame 31, forms the substrate reception room 313 can receiving circuit board 33.The opening that condensing body receiving room 312 can be passed through by light with substrate reception room 313 is connected.One end on the main scanning direction of frame 31, also forms the light source receiving room 314 can receiving the light source 11 of lighting apparatus 1.When lighting apparatus 1 comprises reflecting member 13, the reflecting member receiving room can receiving the reflecting member 13 of lighting apparatus 1 is formed at the other end on main scanning direction of frame 31.
Condensing body 32 makes to illustrate after a while at imageing sensor 34(from the visible ray of bank note P and infrared light) surface on the optical component of imaging.Condensing body 32 can be rod type lens array (rod-lensarray).Common rod type lens array is included in the image-forming component (rod-shaped lens) of multiple erecting equal-magnification imaging-types that main scanning direction arranges point-blank.As long as image-forming component arranges point-blank, then the concrete structure of condensing body 32 is unrestricted.Such as, condensing body 32 can comprise into the many image-forming components arranged point-blank.Such as the various known optical component with light-focusing function of various known microlens arrays etc. can be used as condensing body 32.
Circuit board 33 has rectangular configuration long on main scanning direction.The light source 11 of imageing sensor 34 and lighting apparatus 1 is installed to the upper surface (upper surface in Z-direction) of circuit board 33.Light source 11 is installed to the adjacent one end on main scanning direction of circuit board 33, light to be mapped to the plane of incidence 121 of light conductor 12.In addition, imageing sensor 34 is installed into and makes light receiving surface in z-direction upward to receive from the light of condensing body 32.Also circuit board 33 is installed to for distribution being connected to outside connector etc.
Imageing sensor 34 converts the light concentrated by condensing body 32 to the signal of telecommunication.Imageing sensor 34 can be image sensor IC array.Image sensor IC array is included in multiple image sensor ICs on surface main scanning direction being installed on point-blank circuit board 33.Image sensor IC comprises the multiple light receiving elements (also can be called as photo-electric conversion element) corresponding with the read-out resolution of image sensor cell 3.Like this, imageing sensor 34 is included in multiple image sensor ICs (light receiving element) that main scanning direction arranges point-blank.As long as multiple image sensor IC arranges point-blank, then the structure of imageing sensor 34 is not particularly limited.Such as, image sensor IC can become many to arrange to be formed interconnected point-blank.Being included in as the image sensor IC in the image sensor IC array of imageing sensor 34 can be to visible ray and the sensitive various conventionally known image sensor IC of infrared light.
Lid component 35 is configured to the upside of covering frame 31.Lid component 35 has the function of protection light conductor 12 and condensing body 32, and has by contacting with bank note P and keep the function of the plane of bank note P.Lid component 35 is flat member, and lid component 35 can be glass plate or the transparent resin plate with equality strength.
Image sensor cell 3 also comprise illustrate after a while for being installed to paper type recognition 5() installation portion and connector for being electrically connected to paper type recognition 5.The structure of installation portion and connector is not particularly limited.Installation portion can have any structure that image sensor cell 3 can be installed to paper type recognition 5.Connector can have can connect image sensor cell 3 and paper type recognition 5 preset device to allow any structure of the transmission of electric power or the signal of telecommunication and reception.
As shown in Figure 5 and Figure 6, light conductor 12 is incorporated in the light conductor receiving room 311 of frame 31.Condensing body 32 is incorporated in the condensing body receiving room 312 of frame 31.The circuit board 33 being provided with light source 11 and imageing sensor 34 is incorporated in substrate reception room 313.
When light conductor 12 is incorporated in light conductor receiving room 311 and the circuit board 33 being provided with light source 11 is incorporated in substrate reception room 313, light source 11 with faced by be formed at the plane of incidence 121 of light conductor 12 one end mode be incorporated in light source receiving room 314.Therefore, the light sent by light source 11 enters the plane of incidence 121 of the one end being formed at light conductor 12.When using the reflecting member 13 independent of light conductor 12, reflecting member 13 is in the face of the other end of (or contact) light conductor 12.As a result, the light sent from the other end of light conductor 12 is reflected by reflecting member 13, and again enters light conductor 12.
Except the film of reflector 125 or reflecting member 13 being configured at the structure of reflecting surface 123 of light conductor 12, the structure film of reflector 125 being formed at the inner surface of the light conductor receiving room 311 of frame 31 is also possible, wherein, the reflecting surface 123 of this inner surface and light conductor 12 relatively (or contact).This structure also can obtain beneficial effect.
In order to light is transmitted into bank note P, light source 11 lights the light-emitting component of each color of light and infrared light successively.The light (RGB color visible and infrared light) sent by light source 11 enters light conductor 12 from the plane of incidence 121 of light conductor 12, and at internal communication under the state being diffused face 124 and other reflective surface.Light is transmitted into the reading line O of bank note P from the exit facet 122 of light conductor 12.
Condensing body 32 is by the surface to imageing sensor 34 in reverberation Jiao of the reading line O from bank note P.Imageing sensor 34 converts the optical image formed by condensing body 32 to the signal of telecommunication.
Image sensor cell 3 repeated each color visible and infrared light emission to bank note P and the operation of detection of reflected light in the short time.Based on aforesaid operations, image sensor cell 3 reads the visible images and the infrared light image reading bank note P that are configured at the predetermined pattern (such as, hologram) of bank note P.
Not shown and the unaccounted part of image sensor cell 3 can be identical with conventionally known image sensor cell.
(paper type recognition)
With reference to Fig. 7, the paper type recognition 5 that image sensor cell 3 is applied to is described.Fig. 7 is the schematic sectional view of the structure of paper type recognition 5, shows the cross section along the planar interception vertical with main scanning direction.Paper type recognition 5 sends light to read from the light of bank note P to bank note P etc., and uses the light of this reading to identify the kind of bank note P or true and false.
As shown in Figure 7, paper type recognition 5 comprises the conveying roller 51 of image sensor cell 3 and conveying bank note P.In paper type recognition 5, for keeping bank note P to carry the transport path A of bank note P to be arranged on conveying roller 51 between along read direction (sub scanning direction) via lid component 35 on image sensor cell 3.In this case, condensing body 32 is arranged on the central authorities of transport path A in the focus of bank note P side.The following is the operation of the paper type recognition 5 with this structure.Based on aforesaid operations, the image sensor cell 3 being applied to paper type recognition 5 reads the visible images being configured at the predetermined pattern of bank note P, and reads the infrared light image of bank note P.Than serious banknote image and the visible images of bank note P that will judge in true and false judgement and infrared light image, paper type recognition 5 is then by determining that bank note P's is true and false, wherein true banknote image is by launching visible ray to ready true bank note P and infrared light obtained.This is because true bank note P comprises regions different with the image obtained under infrared light under visible light.Undeclared or unshowned part can be identical with traditional paper type recognition.
Paper type recognition 5 can also comprise transmission illumination equipment 52.Fig. 8 is the schematic sectional view of the structure of the paper type recognition 5 also comprising transmission illumination equipment 52.
Transmission illumination equipment 52 comprises light source 11 and light conductor 12.Light source 11 and the light conductor 12 of transmission illumination equipment 52 have the structure identical with the structure of light conductor 12 with above-mentioned light source 11.Transmission illumination equipment 52 is configured in the face of the position of image sensor cell 3 to send visible ray and infrared light to bank note P.Especially, transmission illumination equipment 52 is configured to make the optical axis of the light sent from the exit facet 122 of light conductor 12 consistent with the optical axis of the condensing body 32 of image sensor cell 3.
The following is the operation of the paper type recognition 5 with this structure.The light source 11 of the light source 11 and transmission illumination equipment 52 that are combined to the lighting apparatus 1 in image sensor cell 3 lights the light-emitting component of each color visible and infrared light successively.
Be transmitted into the visible ray of bank note P and infrared light by the surface reflection of bank note P from the lighting apparatus 1 of image sensor cell 3 and enter condensing body 32, and at the image forming surface of imageing sensor 34.Formed optical image is converted to the signal of telecommunication to obtain visible images and infrared light image based on the reverberation from bank note P by imageing sensor 34.In addition, be transmitted into from transmission illumination equipment 52 condensing body 32 that the visible ray of bank note P and infrared light bank note P enter image sensor cell 3, and at the image forming surface of imageing sensor 34.Formed optical image is converted to the signal of telecommunication with based on obtaining visible images and infrared light image from bank note P through light by imageing sensor 34.
Image sensor cell 3 and transmission illumination equipment 52 repeat to send each color visible and infrared light and detection of reflected light and the operation through light to bank note P at short notice.Based on this operation, image sensor cell 3 reads the visible images and the infrared light image reading bank note P that are configured in predetermined pattern (such as, hologram) on bank note P.
According to this structure, paper type recognition 5 can read visible images and infrared light image based on the reverberation of bank note P with through light.
Paper type recognition 5 also can comprise two groups of image sensor cells 3.Fig. 9 is the schematic sectional view of the structure of the paper type recognition 5 comprising two groups of image sensor cells 3.
As shown in Figure 9, the transport path A that is configured to across bank note P of two groups of image sensor cells 3 is facing with each other.These two groups of image sensor cells 3 are configured to make send from the lighting apparatus 1 of an image sensor cell 3 and enter the condensing body 32 of another image sensor cell 3 through the visible ray of bank note P and infrared light.
The following is the operation of the paper type recognition 5 with this structure.The light source 11 being combined to the lighting apparatus 1 in two groups of image sensor cells 3 lights the light-emitting component of each color visible and infrared light successively.The visible ray sent from the lighting apparatus 1 of an image sensor cell 3 to bank note P and infrared light are by the surface reflection of bank note P and enter the condensing body 32 of a described image sensor cell 3, and the image forming surface of imageing sensor 34 at a described image sensor cell 3.Formed optical image is converted to the signal of telecommunication to obtain visible images and infrared light image based on the reverberation from bank note P by the imageing sensor 34 of a described image sensor cell 3.The visible ray sent from the lighting apparatus 1 of a described image sensor cell 3 and infrared light bank note P and enter the condensing body 32 of another image sensor cell 3, and the image forming surface of imageing sensor 34 at another image sensor cell 3 described.Formed optical image is converted to the signal of telecommunication with based on obtaining visible images and infrared light image from bank note P through light by the imageing sensor 34 of another image sensor cell 3 described.
According to this structure, paper type recognition 5 can read the reflected image on the two sides of bank note P and can read through image.
(embodiment)
The embodiment of checking beneficial effect of the present invention is described with reference to Figure 10 A to Figure 10 C.Figure 10 A is the curve chart of the Illumination Distribution of the lighting apparatus illustrated according to the first comparative example, and this lighting apparatus does not comprise the reflecting surface with wavelength selectivity in the opposition side of the plane of incidence of light conductor.Figure 10 B is the curve chart of the Illumination Distribution of the lighting apparatus illustrated according to the second comparative example, and this lighting apparatus comprises the aluminium film of the reflector as reflecting surface.Figure 10 C is the curve chart of the Illumination Distribution that lighting apparatus 1 is according to an embodiment of the invention shown, wherein, the reflecting material of the reflecting surface of lighting apparatus 1 employs " IR black " (manufacture of Seiko ink company) as infrared reflection pigment.
Figure 11 is the figure of the spectral-transmission favtor that acrylic resin is shown.Figure 12 is the partial enlarged drawing of Figure 11.As is illustrated by figs. 11 and 12, line 100 represents the spectral-transmission favtor of acrylic resin.Spectral-transmission favtor represents the transmissivity of each wavelength of light.The absorptivity of acrylic resin to light reduces along with the increase of transmissivity, and the absorptivity of acrylic resin to light increases along with the reduction of transmissivity.
Such as, synthetic resin comprises the region for absorbing infrared light.Acrylic resin comprises the region of 800nm to 1000nm.This is the inherent characteristic of material, and the absorption of vibrations infrared light caused by the structure of synthetic resin.
The spectral-transmission favtor of the acrylic resin in Figure 11 and Figure 12 represents the data of the test specimen of thickness (d)=2mm.Therefore, be such as that in the light conductor of A4, effect is being gathered from 220mm to 230mm at width.
In an embodiment of the present invention, aluminium is used to the reflector 125 of reflecting surface 123.
First comparative example of Figure 10 A illustrates the structure not forming the reflecting surface with wavelength selectivity in the opposition side of the plane of incidence of light conductor.Although the Illumination Distribution of visible ray is substantially even, the Illumination Distribution of infrared light reduces along with the increase of the distance apart from the plane of incidence.This may be because when acrylic resin is used to light conductor, because the transmissivity of the infrared light (Ir) in 800nm to 1000nm scope is lower than the transmissivity of visible ray (R, G and B), so reduce from the amount of the infrared light of exit facet injection along with the increase of the distance apart from the plane of incidence.Like this, do not formed in the structure of the reflecting surface with wavelength selectivity in the opposition side of the plane of incidence of light conductor, the Illumination Distribution of infrared light is uneven.
Second comparative example of Figure 10 B illustrates the structure comprising the aluminium film being configured at reflecting surface.Prevent the illumination intensity of infrared light from reducing along with the increase of the distance apart from the plane of incidence.But the illumination intensity of visible ray increases along with the reduction apart from reflecting surface distance.This may be because aluminium is to visible light reflectance and little to infrared light reflectance difference therebetween, so visible ray is penetrated from exit facet by reflective surface.Like this, in the structure of the light of all wavelengths sent by light source at reflective surface, the Illumination Distribution of visible ray is uneven.
Figure 10 C shows the embodiments of the invention comprising the reflecting surface with wavelength selectivity.The Illumination Distribution of infrared light is more even than the Illumination Distribution of the example shown in Figure 10 A, and compared with the example shown in Figure 10 B, the Illumination Distribution of visible ray is maintained at uniform state.Like this, according to embodiments of the invention, the Illumination Distribution of visible ray and infrared light can be made even.
Although with reference to the accompanying drawings of embodiments of the present invention, in any case the present invention is not limited to these execution modes.Various modification can be carried out in the case without departing from the scope of the present invention.Such as, although the reflecting surface of light conductor is high to visible light reflectance to the luminance factor of infrared light in embodiments, the feature of reflecting surface is not limited thereto feature.Reflecting surface for optionally reflecting the light absorbed by the material for light conductor 12 can be formed at the other end, forms Uniform Illumination with the material by having low transmissivity to the short wavelength of such as ultraviolet light etc. between short wavelength and long wavelength.In this case, light source 11 can comprise light-emitting component (such as, ultraviolet leds), and this light-emitting component sends the light of the such as ultraviolet region shorter than the wavelength of visible ray etc.
Like this, when light source sends the light of multi-wavelength and the transmissivity of light conductor to other wavelength of transmissivity comparison of the specific wavelength part in the light of the multi-wavelength sent by light source is low, the reflecting surface having a difference in reflectivity to specific wavelength part can be formed at another end face of light conductor.
Although bank note is used as paper in embodiments, the type of paper is unrestricted.Such as, paper can be various security and ID card.Regardless of type, as long as paper can react to infrared light, just can be employed.
The present invention is the effective technology used in lighting apparatus, image sensor cell and paper type recognition.
According to the present invention, there is in one end of the light source opposition side of light conductor the light of reflecting member reflects from the multi-wavelength of light source of difference in reflectivity.This can prevent or suppress the reduction of illumination intensity and the uneven of Illumination Distribution.
Claims (5)
1. a lighting apparatus, it comprises:
Light source, it comprises the light-emitting component sending infrared light and the light-emitting component sending visible ray; With
Bar-shaped light guide, its light shape will sent by described light source, wherein,
Described light source is configured at one end in a longitudinal direction of described light conductor,
The material that the transmissivity of the visible ray that described light conductor is sent by light source described in the transmissivity comparison of the infrared light sent described light source is low is made, and
The reflecting surface being provided with reflecting material is formed at the other end in a longitudinal direction of described light conductor, and described reflecting material is high to described visible light reflectance to the luminance factor of described infrared light.
2. lighting apparatus according to claim 1, wherein,
Described light source comprises the light-emitting component of the wavelength sending ultraviolet region.
3. an image sensor cell, it comprises:
Light source, it comprises the light-emitting component sending infrared light and the light-emitting component sending visible ray;
Bar-shaped light guide, its light shape will sent by described light source;
Condensing body, it assembles the light from irradiated body; With
Imageing sensor, it receives the reverberation assembled by described condensing body to convert described reverberation to the signal of telecommunication, wherein,
Described light source is configured at one end in a longitudinal direction of described light conductor,
The material that the transmissivity of the visible ray that described light conductor is sent by light source described in the transmissivity comparison of the infrared light sent described light source is low is made, and
The reflecting surface being provided with reflecting material is formed at the other end in a longitudinal direction of described light conductor, and described reflecting material is high to described visible light reflectance to the luminance factor of described infrared light.
4. image sensor cell according to claim 3, wherein,
Described light source comprises the light-emitting component of the wavelength sending ultraviolet region.
5. a paper type recognition, it reads the light from described irradiated body under the state making the relatively movement of image sensor cell and irradiated body, wherein,
Described image sensor cell is the image sensor cell according to claim 3 or 4.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
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| JP2012197563 | 2012-09-07 | ||
| JP2012-197563 | 2012-09-07 | ||
| JP2013141003A JP5820845B2 (en) | 2012-09-07 | 2013-07-04 | Illumination device, image sensor unit, and paper sheet identification device |
| JP2013-141003 | 2013-07-04 |
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| CN103685833A CN103685833A (en) | 2014-03-26 |
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| CN106033631A (en) * | 2015-03-11 | 2016-10-19 | 山东新北洋信息技术股份有限公司 | Image sensor and paper money processing device |
| CN107160867A (en) * | 2017-05-08 | 2017-09-15 | 西安印艺苑实业有限公司 | Recognize method, device and the printer of print paper attribute |
| CN109040508A (en) * | 2017-06-12 | 2018-12-18 | 菱光科技股份有限公司 | Light source module group and image-taking device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100416370C (en) * | 2004-12-27 | 2008-09-03 | 三菱电机株式会社 | Surface light source device and display apparatus using the same |
| CN101699844A (en) * | 2009-10-16 | 2010-04-28 | 威海华菱光电有限公司 | Full-spectrum identification image sensor |
| CN102572196A (en) * | 2010-12-21 | 2012-07-11 | 佳能组件股份有限公司 | Image sensor unit and image reader |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100416370C (en) * | 2004-12-27 | 2008-09-03 | 三菱电机株式会社 | Surface light source device and display apparatus using the same |
| CN101699844A (en) * | 2009-10-16 | 2010-04-28 | 威海华菱光电有限公司 | Full-spectrum identification image sensor |
| CN102572196A (en) * | 2010-12-21 | 2012-07-11 | 佳能组件股份有限公司 | Image sensor unit and image reader |
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