CA2358709C - Optical sensor with planar wall - Google Patents
Optical sensor with planar wall Download PDFInfo
- Publication number
- CA2358709C CA2358709C CA002358709A CA2358709A CA2358709C CA 2358709 C CA2358709 C CA 2358709C CA 002358709 A CA002358709 A CA 002358709A CA 2358709 A CA2358709 A CA 2358709A CA 2358709 C CA2358709 C CA 2358709C
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- CA
- Canada
- Prior art keywords
- emitters
- radiation
- lens
- banknote
- receiver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 230000003287 optical effect Effects 0.000 title claims abstract description 35
- 230000005855 radiation Effects 0.000 claims abstract description 67
- 230000037361 pathway Effects 0.000 claims abstract description 23
- 238000012216 screening Methods 0.000 claims description 2
- 230000005693 optoelectronics Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 208000032366 Oversensing Diseases 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 101100323108 Mus musculus Amot gene Proteins 0.000 description 1
- 241000610397 Scarus Species 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
- G07D7/121—Apparatus characterised by sensor details
Abstract
An improved optical sensor for a banknote validator uses an aspherical lens having a planar wall as a combination radiation plug for a port in the pathway and a focusing arrangement. Emitters and receivers are closely positioned on a common support and generally located at the focal point of the lens. The radiation reflected by a banknote is focused and received by the receiver. The lens also serves to collimate the produced radiation of the emitters for scanning of the banknote.
Description
___ _ _. ___ ø_ Y 4~ .. __ ___ __ _ __ F iELD OF TIC INV~111TION
Th,e present iavention rela~ea to validatorsr and in particular, relates to valic~ators having optical scanrlera _ far measuring the reflectance of paper bankuoteB as they move past a sensor.
~~xourr~ o~ z~ nvv~y i ioN
The evaluation of bar~cnotes to determine their authenticity in theory is relatively straightfoZ~vaard, rowever, in practice, it is quite difficult to carry out in a cost effective manner. Banknotes are evalu$ted by scanning stripped regions of the dote or security paper as it is icoved past a sensor. The banknote is normally evaluated wits respect to optical characteristics, magr~etiC
characts~=istics and/or with respect to capacitance.
Published Application GB 2093179A discloses a system fnr measuring the opacity of ba~2k_'rlotes anal detecting poles in banknotes. A rads.ation source is provided on one side of the bar_knote and two receivers are provided on the oppos:~te side of the banknote. This arrangement allows independent detection of izoles or tears as well as a measurement of opacity.
U.S. Patent 5,304,813 discloses an arrangement for optically sensing characteristics of banknotes using a series of radiation emitters, spaced either site of a photoelectric element and having a particular angular relationship there~rith.
The optical characteristics of a banknote are evah_ated by measuring the amot;nt of radiation reflected from the banknote. The optical sensors include erdtters which produce radiation of different wave lengths, and focus the radiation or_ a particular target location of the barll~.ote. The reflected radiation is measured and compared Printed:l2-01-2001 ' 1 wi~?rence s'_gnal$ to determine whether to accept or reject the banknote.
This optical evaluation ie difficult in that the exact spacing of the bat~ote grcun the optical sensor varies as the banknote ie, ess~tially, f7.oatit~g ~rithin an oversized pathway along which the bss~ote moves. In addition, the bsnJaiace Can be angled in the pathway lorgitudianlly and laterally, even though the banla~ote is generally centered. Thug, the spacing sad the angle change, which influences the measured signal. Furthermore.
czeases in the banknote also caussa angle variations which in turn ir.~pect the amount of radi ation that will be reflected from the b~ote back to a sensor. Other factors which affect the measured signal include the t~mount of radiation reflected back to a receiver by the optical sensor which radiation has not been r~flected by~the banJoZOte. This portion of the signal typically produces what is referred to as cross-talk and it is desirable to keep this to as small a level as possible.
The pathway typically includes additiarml elements or surfaces between the optical sensor and the banknote and these elements ar s~.xrfaces ca:~ cause reflected radiation.
which again is not dependent upon the banknote. For example, there coul3 be a window member which forms part of the pathway with the optical sensor directly behind the window. The window provides the desired smooth pathway.
but increases cross--talk.
ether optical ban3rnote scaru~l~.ng arra.~gernents have positianed the emitter at a first acute ar_g3e, relative to the banknote, and appropriately positioned the receiver at a different angle for receiving the reflected radiation.
Two distinc= optical arrangements are provided to focus the emitted ana received radiation. Unfortunately, these systems produce significant variations with respect to
Th,e present iavention rela~ea to validatorsr and in particular, relates to valic~ators having optical scanrlera _ far measuring the reflectance of paper bankuoteB as they move past a sensor.
~~xourr~ o~ z~ nvv~y i ioN
The evaluation of bar~cnotes to determine their authenticity in theory is relatively straightfoZ~vaard, rowever, in practice, it is quite difficult to carry out in a cost effective manner. Banknotes are evalu$ted by scanning stripped regions of the dote or security paper as it is icoved past a sensor. The banknote is normally evaluated wits respect to optical characteristics, magr~etiC
characts~=istics and/or with respect to capacitance.
Published Application GB 2093179A discloses a system fnr measuring the opacity of ba~2k_'rlotes anal detecting poles in banknotes. A rads.ation source is provided on one side of the bar_knote and two receivers are provided on the oppos:~te side of the banknote. This arrangement allows independent detection of izoles or tears as well as a measurement of opacity.
U.S. Patent 5,304,813 discloses an arrangement for optically sensing characteristics of banknotes using a series of radiation emitters, spaced either site of a photoelectric element and having a particular angular relationship there~rith.
The optical characteristics of a banknote are evah_ated by measuring the amot;nt of radiation reflected from the banknote. The optical sensors include erdtters which produce radiation of different wave lengths, and focus the radiation or_ a particular target location of the barll~.ote. The reflected radiation is measured and compared Printed:l2-01-2001 ' 1 wi~?rence s'_gnal$ to determine whether to accept or reject the banknote.
This optical evaluation ie difficult in that the exact spacing of the bat~ote grcun the optical sensor varies as the banknote ie, ess~tially, f7.oatit~g ~rithin an oversized pathway along which the bss~ote moves. In addition, the bsnJaiace Can be angled in the pathway lorgitudianlly and laterally, even though the banla~ote is generally centered. Thug, the spacing sad the angle change, which influences the measured signal. Furthermore.
czeases in the banknote also caussa angle variations which in turn ir.~pect the amount of radi ation that will be reflected from the b~ote back to a sensor. Other factors which affect the measured signal include the t~mount of radiation reflected back to a receiver by the optical sensor which radiation has not been r~flected by~the banJoZOte. This portion of the signal typically produces what is referred to as cross-talk and it is desirable to keep this to as small a level as possible.
The pathway typically includes additiarml elements or surfaces between the optical sensor and the banknote and these elements ar s~.xrfaces ca:~ cause reflected radiation.
which again is not dependent upon the banknote. For example, there coul3 be a window member which forms part of the pathway with the optical sensor directly behind the window. The window provides the desired smooth pathway.
but increases cross--talk.
ether optical ban3rnote scaru~l~.ng arra.~gernents have positianed the emitter at a first acute ar_g3e, relative to the banknote, and appropriately positioned the receiver at a different angle for receiving the reflected radiation.
Two distinc= optical arrangements are provided to focus the emitted ana received radiation. Unfortunately, these systems produce significant variations with respect to
- 2 --Printed:l 2-01-2001;
~ta~3.cas in the position of the ban'~ota in the pathway as well as variatiory.s due to creaewa in the be~nlaxot~ .
~ta~3.cas in the position of the ban'~ota in the pathway as well as variatiory.s due to creaewa in the be~nlaxot~ .
3'he preseat inv~tiart provides an optical sensor with improved accuracy in the measurement of the optical _ reflecting properties of a banknote 8s the ban3caote is moved past the sensor.
sub or rxx znw~mmzo~
A validator according to the present invention comprises a pathway through which the bar~a~ote is moved cad an optical sensor ~.s positioned in this pathway for evaluating the o~rtical characteristics on a face of the banknote. The optical sexi~or comprises a lens, a plurality of radiation emitters and a radiat:Lor r~~~~= °r ~'"-e 'sr°
- 2a -Printed:l2-01-2001 ;
has a first surface which is generally planar and a second surface which is convex. These surfaces cooperating to define a focal point of the lens which faces the convex surface. The pathway includes an opening which receives the lens, with the planar surface of the lens closing the opening and forming part of the pathway. The radiation emitters and radiation receiver are closely clustered at the focal point of the lens and include a shield member which isolates the receiver from direct radiation of the emitters. The lens collimates the emitted radiation of the emitters to produce generally parallel rays of radiation which are reflected by the banknote as it moves past the sensor. The reflected radiation from the banknote that impinges on the lens is focused by the lens and directed to the receiver. The lens directs radiation reflected by the convex surface and the planar surface of the lens away from the receiver and reduces cross-talk between the receiver and the emitters.
According to a preferred aspect of the invention, the emitters each emit radiation of a different wavelength.
According to a further aspect of the invention, the emitters are clustered together with minimal spacing therebetween.
According to yet a further aspect of the invention, the emitters and the receiver are separated by a screening member.
According to yet a further aspect of the invention, the emitters and the receiver are all located on a common circuit board.
According to yet a further aspect of the invention, the emitters include at least two different types of emitters to produce radiation having two desired wave lengths for investigating a banknote.
According to yet a further aspect of the invention, five emitters are provided, each of which produce a wave length of a different radiation for investigating the banknote.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the invention are shown in the drawings, wherein:
Figure 1 is an illustrative view of part of a validator showing a banknote moving past an optical sensor;
Figure 2 is a top view of the optoelectronic components of the optical sensor;
Figure 3 is a sectional view taken along AA of Figure 2; and Figure 4 is an illustrative view showing the positioning of the emitters and receivers to reduce cross-talk.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The validator 2 includes a pathway 4 for moving the banknote 10 past an optical sensor 14. The pathway includes an exterior wall 6 and an interior wall 8 having a port 22 in the interior wall 8. The optical sensor 14 includes a lens 16 which is sized to fit into the port 22 as generally shown in Figure 1. The lens 16 includes a planar surface 18 which forms a continuation of the interior wall 8 of the pathway and effectively closes the port 22. The lens also includes a convex surface 20 which faces the opto-electronic components 26. The lens is preferrably, an aspherical lens.
The lens cooperates with the opto-electronic component 26 secured on the circuit board 28. The opto-electronic component includes a series of pins soldered to the circuit board.
sub or rxx znw~mmzo~
A validator according to the present invention comprises a pathway through which the bar~a~ote is moved cad an optical sensor ~.s positioned in this pathway for evaluating the o~rtical characteristics on a face of the banknote. The optical sexi~or comprises a lens, a plurality of radiation emitters and a radiat:Lor r~~~~= °r ~'"-e 'sr°
- 2a -Printed:l2-01-2001 ;
has a first surface which is generally planar and a second surface which is convex. These surfaces cooperating to define a focal point of the lens which faces the convex surface. The pathway includes an opening which receives the lens, with the planar surface of the lens closing the opening and forming part of the pathway. The radiation emitters and radiation receiver are closely clustered at the focal point of the lens and include a shield member which isolates the receiver from direct radiation of the emitters. The lens collimates the emitted radiation of the emitters to produce generally parallel rays of radiation which are reflected by the banknote as it moves past the sensor. The reflected radiation from the banknote that impinges on the lens is focused by the lens and directed to the receiver. The lens directs radiation reflected by the convex surface and the planar surface of the lens away from the receiver and reduces cross-talk between the receiver and the emitters.
According to a preferred aspect of the invention, the emitters each emit radiation of a different wavelength.
According to a further aspect of the invention, the emitters are clustered together with minimal spacing therebetween.
According to yet a further aspect of the invention, the emitters and the receiver are separated by a screening member.
According to yet a further aspect of the invention, the emitters and the receiver are all located on a common circuit board.
According to yet a further aspect of the invention, the emitters include at least two different types of emitters to produce radiation having two desired wave lengths for investigating a banknote.
According to yet a further aspect of the invention, five emitters are provided, each of which produce a wave length of a different radiation for investigating the banknote.
BRIEF DESCRIPTION OF THE DRAWINGS
Preferred embodiments of the invention are shown in the drawings, wherein:
Figure 1 is an illustrative view of part of a validator showing a banknote moving past an optical sensor;
Figure 2 is a top view of the optoelectronic components of the optical sensor;
Figure 3 is a sectional view taken along AA of Figure 2; and Figure 4 is an illustrative view showing the positioning of the emitters and receivers to reduce cross-talk.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The validator 2 includes a pathway 4 for moving the banknote 10 past an optical sensor 14. The pathway includes an exterior wall 6 and an interior wall 8 having a port 22 in the interior wall 8. The optical sensor 14 includes a lens 16 which is sized to fit into the port 22 as generally shown in Figure 1. The lens 16 includes a planar surface 18 which forms a continuation of the interior wall 8 of the pathway and effectively closes the port 22. The lens also includes a convex surface 20 which faces the opto-electronic components 26. The lens is preferrably, an aspherical lens.
The lens cooperates with the opto-electronic component 26 secured on the circuit board 28. The opto-electronic component includes a series of pins soldered to the circuit board.
- 4 -Details of the opto-electronic component 26 and its relationship with lens 16 are shown in Figures 2 and 3.
Five emitters 30 are placed in a cluster type arrangement on the support 27 such that the spacing between emitters is quite small. The emitters are non-directional and preferably emit radiation of different wave lengths for evaluating the reflecting properties of the banknote as it moves past the sensor. A receiver 32 is also positioned on the support 27 and is separated from the emitters 30 by means of the spacer or barrier 34 which shields the receiver 32 from direct radiation of the emitters 30. The receiver 32 is positioned in close proximity to the emitters and slightly offset from the focal point.
The optical properties of the sensing arrangement are shown in additional detail in Figure 4. The emitters 30 are located at the focus of the lens and produce radiation. Most of the radiation is transmitted through the lens and forms a collimated beam for radiating a strip of the banknote as it moves past the sensor. The radiation reflected by the banknote that impinges on the lens is redirected and focused on the receiver 32. Variation of the spacing of the banknote from the lens does not appreciably effect the results, as the radiation has been collimated and is in parallel rays. The slight offset in the position of the receiver relative to the focal point is not significant.
The radiation reflected by the lens indicated by reflected beams 38, 40, 42 and 44 and if received contributes to undesirable cross talk. Beams 38 and 40 strike the convex surface 20 of the lens and are reflected by the surface. Most of the radiation will pass through the lens for irradiating the banknote, but there is a portion of the radiation that will be reflected. The convex nature of the lens directs this radiation outwardly and away from the receiver 32. In this way, reflected radiation from the aspherical surface 20 of the lens is
Five emitters 30 are placed in a cluster type arrangement on the support 27 such that the spacing between emitters is quite small. The emitters are non-directional and preferably emit radiation of different wave lengths for evaluating the reflecting properties of the banknote as it moves past the sensor. A receiver 32 is also positioned on the support 27 and is separated from the emitters 30 by means of the spacer or barrier 34 which shields the receiver 32 from direct radiation of the emitters 30. The receiver 32 is positioned in close proximity to the emitters and slightly offset from the focal point.
The optical properties of the sensing arrangement are shown in additional detail in Figure 4. The emitters 30 are located at the focus of the lens and produce radiation. Most of the radiation is transmitted through the lens and forms a collimated beam for radiating a strip of the banknote as it moves past the sensor. The radiation reflected by the banknote that impinges on the lens is redirected and focused on the receiver 32. Variation of the spacing of the banknote from the lens does not appreciably effect the results, as the radiation has been collimated and is in parallel rays. The slight offset in the position of the receiver relative to the focal point is not significant.
The radiation reflected by the lens indicated by reflected beams 38, 40, 42 and 44 and if received contributes to undesirable cross talk. Beams 38 and 40 strike the convex surface 20 of the lens and are reflected by the surface. Most of the radiation will pass through the lens for irradiating the banknote, but there is a portion of the radiation that will be reflected. The convex nature of the lens directs this radiation outwardly and away from the receiver 32. In this way, reflected radiation from the aspherical surface 20 of the lens is
- 5 -directed outwardly and the effect on the signal received by the receiver 32 is minimal.
Reflected radiation 42 and 44 is produced due to radiation which passes through the first surface of the lens and is reflected by the planar surface 18 of the lens.
This reflected radiation is focused at point 50 located to one side of the receiver 32. In this way, reflected radiation returned by the planar surface 18 is focused at a point exterior to one side of the receiver and thus the effect of such reflected radiation on the receiver is reduced.
Conveniently, the opto-reciever 32 and the emitters 30 are all produced on a common support and the position thereof is accurately determined. The aspherical lens 16 appropriately processes the emitted radiation to produce a collimated beam for radiating the banknote, and the reflected radiation from the banknote is focused and directed to the receiver 32 closely positioned at the focal point of the lens. With this arrangement, the signal produced by the opto-receiver more closely correlates with the optical properties of the scanned banknote.
The present optical arrangement, has been designed to accept that wobble of the banknote within the pathway cannot be eliminated and as such the separation distance of the banknote from the optical sensor will vary. The effect of this varying distance has been reduced, due to using a collimated beam of radiation for exposing the banknote.
The structure also positions a planar surface of the optical lens to form a continuation of the pathway wall, and as such, additional optical members are eliminated.
The lens has been designed to cause a large portion of any radiation reflected by the lens itself to be directed away from the receiver, or be focused at a point to one side of the receiver. In this way, measured radiation reflected by
Reflected radiation 42 and 44 is produced due to radiation which passes through the first surface of the lens and is reflected by the planar surface 18 of the lens.
This reflected radiation is focused at point 50 located to one side of the receiver 32. In this way, reflected radiation returned by the planar surface 18 is focused at a point exterior to one side of the receiver and thus the effect of such reflected radiation on the receiver is reduced.
Conveniently, the opto-reciever 32 and the emitters 30 are all produced on a common support and the position thereof is accurately determined. The aspherical lens 16 appropriately processes the emitted radiation to produce a collimated beam for radiating the banknote, and the reflected radiation from the banknote is focused and directed to the receiver 32 closely positioned at the focal point of the lens. With this arrangement, the signal produced by the opto-receiver more closely correlates with the optical properties of the scanned banknote.
The present optical arrangement, has been designed to accept that wobble of the banknote within the pathway cannot be eliminated and as such the separation distance of the banknote from the optical sensor will vary. The effect of this varying distance has been reduced, due to using a collimated beam of radiation for exposing the banknote.
The structure also positions a planar surface of the optical lens to form a continuation of the pathway wall, and as such, additional optical members are eliminated.
The lens has been designed to cause a large portion of any radiation reflected by the lens itself to be directed away from the receiver, or be focused at a point to one side of the receiver. In this way, measured radiation reflected by
- 6 -the lens is reduced and is generally the same for the radiation at different wave lengths.
This structure also uses a plurality of non-directional emitters for producing radiation of several different wave lengths. These wave lengths are selected to reveal certain inks used in fraudulent banknotes.
Preferably, three of the emitters emit radiation in the visible range and two of the emitters emit radiation in the infrared range.
The present structure has resulted in improved accuracy of the scanning of the banknote and a simplified system.
With the present invention, a very simple construction for an optical sensor is realized. The lens is designed to act as a plug for the aperture in the pathway, and therefore, the lens acts to appropriately process the radiation, and as a window for the pathway.
The flat surface of the lens forms a continuation of the walls of the pathway and does not change the position of the banknote as it moves past the optical sensor. The interior surface of the lens is made aspherical (hyperboloid-like). This shape reduces cross-talk between the emitters and the receiver. Basically, the radiation reflected by the flat surface of the lens is generally directed away from the receiver. In the present structure, the plurality of light emitters and the photo-detector are located in immediate proximity to the centreline of the lens and adjacent the focus of the lens. The radiation from the emitters form a collimated beam irradiating a banknote, and reflected radiation from the banknote is generally directed to the photo-detector. A further aspect of the structure is the flat surface of the lens which is used to close the port in the pathway. This reduces cross-talk by simplifying the optical path and reducing the amount of radiation that will be reflected. The plurality , o rs are located as close together as possi?ale.
Thal~ aroupirig. or alueterir~g of the s~ittar~, preferably produces signals of diffe-ent wave langrthe which ars ess~tially equau.Iy effaczed by the proaertiee of tho optical system. In this way, the measured eier~al more accurately corresponc4a to the actual properties of the banlaao t a .
_ g _ TDThL F. ~9 Printed:12-01-2001 ~ 4
This structure also uses a plurality of non-directional emitters for producing radiation of several different wave lengths. These wave lengths are selected to reveal certain inks used in fraudulent banknotes.
Preferably, three of the emitters emit radiation in the visible range and two of the emitters emit radiation in the infrared range.
The present structure has resulted in improved accuracy of the scanning of the banknote and a simplified system.
With the present invention, a very simple construction for an optical sensor is realized. The lens is designed to act as a plug for the aperture in the pathway, and therefore, the lens acts to appropriately process the radiation, and as a window for the pathway.
The flat surface of the lens forms a continuation of the walls of the pathway and does not change the position of the banknote as it moves past the optical sensor. The interior surface of the lens is made aspherical (hyperboloid-like). This shape reduces cross-talk between the emitters and the receiver. Basically, the radiation reflected by the flat surface of the lens is generally directed away from the receiver. In the present structure, the plurality of light emitters and the photo-detector are located in immediate proximity to the centreline of the lens and adjacent the focus of the lens. The radiation from the emitters form a collimated beam irradiating a banknote, and reflected radiation from the banknote is generally directed to the photo-detector. A further aspect of the structure is the flat surface of the lens which is used to close the port in the pathway. This reduces cross-talk by simplifying the optical path and reducing the amount of radiation that will be reflected. The plurality , o rs are located as close together as possi?ale.
Thal~ aroupirig. or alueterir~g of the s~ittar~, preferably produces signals of diffe-ent wave langrthe which ars ess~tially equau.Iy effaczed by the proaertiee of tho optical system. In this way, the measured eier~al more accurately corresponc4a to the actual properties of the banlaao t a .
_ g _ TDThL F. ~9 Printed:12-01-2001 ~ 4
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A validator (2) comprising a pathway (4) through which a banknote is moved past an optical sensor (14) which evaluates optical characteristics on a face of a banknote;
said optical sensor (14) comprising a lens (16), a plurality of radiation emitters (30) and a radiation receiver (32), said lens (16) having a first surface (18) which is generally planar and a second surface (2) which is convex with said surfaces (18, 20) defining a focal point of said lens which faces said convex surface (20), said pathway including an opening therein which receives said optical sensor with said planar surface of said lens forming part of a boundary of said pathway (4), said radiation emitters (30) and said radiation receiver (32) being closely clustered at said focal point and including a shield member (34) which isolates said receiver (32) from direct radiation of said emitters (30), said lens (16) collimating the emitted radiation of said emitters (30) to produce parallel rays of radiation for radiating a banknote as it moves past said sensor (4) and to focus reflected radiation from said banknote that impinges said lens (16) on said receiver (32), said convex surface (20) of said lens (16) being shaped to direct radiation reflected by said convex surface (20) away from said receiver to reduce cross talk between said receiver (32) and said emitters (30).
said optical sensor (14) comprising a lens (16), a plurality of radiation emitters (30) and a radiation receiver (32), said lens (16) having a first surface (18) which is generally planar and a second surface (2) which is convex with said surfaces (18, 20) defining a focal point of said lens which faces said convex surface (20), said pathway including an opening therein which receives said optical sensor with said planar surface of said lens forming part of a boundary of said pathway (4), said radiation emitters (30) and said radiation receiver (32) being closely clustered at said focal point and including a shield member (34) which isolates said receiver (32) from direct radiation of said emitters (30), said lens (16) collimating the emitted radiation of said emitters (30) to produce parallel rays of radiation for radiating a banknote as it moves past said sensor (4) and to focus reflected radiation from said banknote that impinges said lens (16) on said receiver (32), said convex surface (20) of said lens (16) being shaped to direct radiation reflected by said convex surface (20) away from said receiver to reduce cross talk between said receiver (32) and said emitters (30).
2. A validator (2) as claimed in claim 1, wherein said lens (16) is an aspherical lens.
3. A validator (2) as claimed in claim 2 wherein said emitters (30) emit radiation of different wavelengths.
4. A validator (2) as claimed in claim 1 wherein said emitters (30) are non-directional emitters (30) and said emitters (30) are clustered together with minimal spacing therebetween.
5. A validator (2) as claimed in claim 2 wherein said emitters (30) and said receivers (32) are separated by a screening member (34).
6. A validator (2) as claimed in claim 1 wherein said emitters (30) and said receiver (32) are all located on a common support (27) attached to a circuit board (28).
7. A validator (2) as claimed in claim 2 wherein said emitters (30) include at least two different types of emitters (30) to produce radiation having two different wavelengths for investigating a banknote.
8. A validator (2) as claimed in claim 6 wherein said emitters (30) include at least 5 emitters each of which emit a different wavelength of radiation.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CA1999/000116 WO2000049582A1 (en) | 1999-02-17 | 1999-02-17 | Optical sensor with planar wall |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2358709A1 CA2358709A1 (en) | 2000-08-24 |
| CA2358709C true CA2358709C (en) | 2005-08-02 |
Family
ID=4173352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002358709A Expired - Fee Related CA2358709C (en) | 1999-02-17 | 1999-02-17 | Optical sensor with planar wall |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1153371B1 (en) |
| JP (1) | JP2002537616A (en) |
| AU (1) | AU772395B2 (en) |
| CA (1) | CA2358709C (en) |
| DE (1) | DE69902948T2 (en) |
| ES (1) | ES2183511T3 (en) |
| WO (1) | WO2000049582A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO315264B1 (en) | 2001-01-23 | 2003-08-11 | Tomra Systems Asa | Detection System |
| JP5614957B2 (en) * | 2009-08-19 | 2014-10-29 | 日本金銭機械株式会社 | Optical sensor device for paper sheet discrimination |
| JP5702480B2 (en) * | 2014-02-10 | 2015-04-15 | 日本金銭機械株式会社 | Optical sensor device for paper sheet discrimination |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2932962C2 (en) * | 1979-08-14 | 1982-04-08 | GAO Gesellschaft für Automation und Organisation mbH, 8000 München | Method for checking the degree of soiling of recording media, in particular bank notes |
| GB2093179B (en) * | 1981-02-17 | 1984-09-19 | De La Rue Syst | Measuring opacity and detecting holes in sheet |
| GB8311795D0 (en) * | 1983-04-29 | 1983-06-02 | De La Rue Syst | Detecting luminescent security features |
| DE59208542D1 (en) * | 1991-10-14 | 1997-07-03 | Mars Inc | Device for optical recognition of documents |
-
1999
- 1999-02-17 DE DE69902948T patent/DE69902948T2/en not_active Expired - Lifetime
- 1999-02-17 WO PCT/CA1999/000116 patent/WO2000049582A1/en active IP Right Grant
- 1999-02-17 JP JP2000600246A patent/JP2002537616A/en active Pending
- 1999-02-17 AU AU25061/99A patent/AU772395B2/en not_active Ceased
- 1999-02-17 ES ES99904648T patent/ES2183511T3/en not_active Expired - Lifetime
- 1999-02-17 CA CA002358709A patent/CA2358709C/en not_active Expired - Fee Related
- 1999-02-17 EP EP99904648A patent/EP1153371B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP1153371B1 (en) | 2002-09-11 |
| JP2002537616A (en) | 2002-11-05 |
| WO2000049582A1 (en) | 2000-08-24 |
| CA2358709A1 (en) | 2000-08-24 |
| DE69902948T2 (en) | 2003-05-22 |
| EP1153371A1 (en) | 2001-11-14 |
| ES2183511T3 (en) | 2003-03-16 |
| AU2506199A (en) | 2000-09-04 |
| AU772395B2 (en) | 2004-04-29 |
| DE69902948D1 (en) | 2002-10-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20140218 |