CN210927718U - Contact image sensor and anti-counterfeiting device - Google Patents
Contact image sensor and anti-counterfeiting device Download PDFInfo
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- CN210927718U CN210927718U CN201922495577.5U CN201922495577U CN210927718U CN 210927718 U CN210927718 U CN 210927718U CN 201922495577 U CN201922495577 U CN 201922495577U CN 210927718 U CN210927718 U CN 210927718U
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Abstract
The utility model provides a contact image sensor and anti-fake device. A contact image sensor comprising: a light source emitting at least deep ultraviolet light; the light source is positioned on one side of the light-transmitting glass, light emitted by the light source is emitted to the light-transmitting glass, the object to be scanned is placed on the other side of the light-transmitting glass, and the light emitted by the light source is reflected to form reflected light; and the imaging device and the light source are positioned on the same side of the light-transmitting glass, and the reflected light enters the imaging device for imaging. The utility model provides an among the prior art contact image sensor have the problem that can not detect fluorescence anti-fake information.
Description
Technical Field
The utility model relates to a contact image sensor equipment technical field particularly, relates to a contact image sensor and anti-counterfeiting device.
Background
The contact image sensor is mainly applied to equipment such as fax machines, scanners, multifunctional integrated machines, automatic teller machines, cash sorters, book readers and bill scanners and is used for scanning and identifying images of originals. Most of scanning information of the contact type image sensor used by the device is visible light information or infrared light information, the used light source is a multispectral light source comprising visible light, infrared light or ultraviolet light, and the assembled glass plate is made of common glass. The existing contact image sensor can not detect the fluorescent anti-counterfeiting information on the bill.
That is, the contact image sensor in the prior art has the problem that the fluorescent anti-counterfeiting information cannot be detected.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a contact image sensor and an anti-counterfeit device, which can solve the problem of the prior art that the contact image sensor cannot detect the fluorescent anti-counterfeit information.
In order to achieve the above object, according to an aspect of the present invention, there is provided a contact image sensor including: a light source emitting at least deep ultraviolet light; the light source is positioned on one side of the light-transmitting glass, light emitted by the light source is emitted to the light-transmitting glass, and the object to be scanned is placed on the other side of the light-transmitting glass to reflect the light emitted by the light source to form reflected light; and the imaging device and the light source are positioned on the same side of the light-transmitting glass, and the reflected light enters the imaging device for imaging.
Further, the light-transmitting glass is quartz glass.
Furthermore, the number of the light sources is multiple, at least one light source emits deep ultraviolet light, and at least one light source emits at least one of visible light, infrared light and ultraviolet light; or the light source is one, the light source is a multispectral light source, and the light source emits at least one of visible light, infrared light and ultraviolet light and deep ultraviolet light.
Furthermore, when the light source is a plurality of, contact image sensor still includes the narrow band filter, and the narrow band filter is located the emergent direction of the light source of launching dark ultraviolet light.
Further, when the light source is plural, the light source emitting deep ultraviolet light may be one of an array light source and a light guide bar light source.
Further, the image forming apparatus includes: the lens is positioned below the light-transmitting glass; the photoelectric conversion chip is positioned below the lens and is arranged opposite to the lens; and the circuit board is arranged below the photoelectric conversion chip and is electrically connected with the photoelectric conversion chip.
Further, the imaging device further comprises an interface, and the interface is arranged on the circuit board and used for transmitting the electric signals.
Further, when there are two light sources, the two light sources are respectively located at two sides of the lens.
Further, the contact image sensor also comprises a frame, the frame is provided with an accommodating cavity, and the light source, the light-transmitting glass and the imaging device are all positioned in the accommodating cavity.
Further, the wavelength of the deep ultraviolet light is 210 nm or more and 365 nm or less.
According to another aspect of the present invention, there is provided an anti-counterfeiting device, comprising the above-mentioned contact image sensor.
By applying the technical scheme of the utility model, the contact image sensor comprises a light source, light-transmitting glass and an imaging device, wherein the light source at least emits deep ultraviolet light; the light source is positioned at one side of the light-transmitting glass, light emitted by the light source is emitted to the light-transmitting glass, and the object to be scanned is placed at the other side of the light-transmitting glass to reflect the light emitted by the light source to form reflected light; the imaging device and the light source are positioned on the same side of the light-transmitting glass, and the reflected light enters the imaging device to be imaged.
The light source emits deep ultraviolet light, so that the deep ultraviolet light can excite fluorescence on the bill, the fluorescence anti-counterfeiting information on the bill can be identified, the contact type image sensor can detect the fluorescence anti-counterfeiting information, and the application range of the contact type image sensor is enlarged. The transparent glass is arranged to enable light emitted by the light source to penetrate through so as to irradiate on an object to be scanned. Meanwhile, the light-transmitting glass can also seal and protect the light source and the imaging device, so that the light source and the imaging device can be stably used. The light emitted by the light source irradiates to the object to be scanned, the light excites and reflects the object to be scanned and then irradiates to the imaging device, and the imaging device converts the optical information into the electrical information to form an image.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of an overall structure of a contact image sensor according to a first embodiment of the present invention; and
fig. 2 is a schematic view showing an overall structure of a contact image sensor according to a second embodiment of the present invention;
fig. 3 is a schematic view showing an overall structure of a contact image sensor according to a third embodiment of the present invention;
fig. 4 is a schematic diagram illustrating an overall structure of a contact image sensor according to a fourth embodiment of the present invention;
fig. 5 is a schematic view showing an overall structure of a contact image sensor according to a fifth embodiment of the present invention;
fig. 6 is a schematic diagram showing the position relationship between the first light source and the narrow-band filter in fig. 5.
FIG. 7 illustrates image information of a deposit slip illuminated with visible light;
FIG. 8 illustrates image information for a deposit slip illuminated with deep violet light;
fig. 9 shows image information of the front surface of the canvas irradiated with visible light;
fig. 10 shows image information of irradiating the front surface of the canvas with deep ultraviolet light;
fig. 11 shows image information of the reverse side of the canvas irradiated with visible light;
fig. 12 shows image information of irradiating the reverse side of the canvas with deep ultraviolet light;
fig. 13 shows image information of irradiating the reverse side of the canvas with ultraviolet light;
fig. 14 shows a spectral characteristic diagram of a narrow-band filter segment according to the present invention.
Wherein the figures include the following reference numerals:
10. a light source; 11. a first light source; 111. an LED light emitting section; 112. a light guide; 12. a second light source; 20. a light-transmitting glass; 30. an imaging device; 31. a lens; 32. a photoelectric conversion chip; 33. a circuit board; 34. an interface; 40. a narrow band filter; 50. a frame; 51. a receiving cavity.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.
In order to solve the problem that the contact image sensor in the prior art can not detect the fluorescent anti-counterfeiting information, the utility model provides a contact image sensor and anti-counterfeiting device.
As shown in fig. 1 to 14, the contact image sensor includes a light source 10, a light-transmitting glass 20, and an imaging device 30, the light source 10 emitting at least deep ultraviolet light; the light source 10 is positioned at one side of the transparent glass 20, light emitted by the light source 10 is emitted to the transparent glass 20, and the object to be scanned is placed at the other side of the transparent glass 20 to reflect the light emitted by the light source 10 to form reflected light; the imaging device 30 is located on the same side of the light-transmitting glass 20 as the light source 10, and the reflected light enters the imaging device 30 to be imaged.
The light source 10 emits deep ultraviolet light, so that the deep ultraviolet light can excite fluorescence on the bill, fluorescent anti-counterfeiting information on the bill can be identified, the contact type image sensor can detect the fluorescent anti-counterfeiting information, and the application range of the contact type image sensor is enlarged. The transparent glass 20 is provided so that light emitted from the light source 10 can be transmitted to irradiate an object to be scanned. Meanwhile, the light-transmitting glass 20 may also seal and protect the light source 10 and the imaging device 30, so that the light source 10 and the imaging device 30 may be stably used. The light emitted from the light source 10 irradiates an object to be scanned, the light excites and reflects the object to be scanned and then enters the imaging device 30, and the imaging device 30 converts optical information into electrical information to form an image.
Specifically, the light-transmitting glass 20 is quartz glass. The quartz glass has high transmittance, and the deep ultraviolet light emitted by the light source 10 can be irradiated on the object to be scanned through the quartz glass, so that the normal operation of the contact sensor can be ensured. The common glass can absorb the deep ultraviolet light, the intensity of the deep ultraviolet light after being absorbed by the common glass can be greatly reduced, and the deep ultraviolet light can not irradiate on an object to be scanned, so that the scanning fails.
Alternatively, when the light source 10 is plural, the light source 10 emitting deep ultraviolet light may be one of an array light source and a light guide bar light source.
In order to see the effect of the deep ultraviolet light, the images scanned by various lights are compared. Fig. 7 is information of a deposit receipt irradiated with visible light, fig. 8 is information irradiated with deep ultraviolet light, and the green anti-counterfeiting thread in fig. 8 can be clearly seen, but the green anti-counterfeiting thread is not visible without being excited by the deep ultraviolet light. If the narrow-band filter is not added, stray light can be mixed, and the background in fig. 8 can have visible light images, so that the anti-counterfeiting thread is not obvious. Fig. 9 is information irradiated by visible light on the front surface of the canvas, and fig. 10 is information irradiated by deep ultraviolet light, which can see the anti-counterfeiting pattern and the anti-counterfeiting thread background, and can also see the information irradiated by visible light in the anti-counterfeiting pattern and the anti-counterfeiting thread background, that is, the anti-counterfeiting image is affected by stray light. Fig. 11 is information of the back surface of the canvas irradiated by visible light, and fig. 12 is information of the back surface of the canvas irradiated by deep ultraviolet light, so that the anti-counterfeiting pattern and the anti-counterfeiting thread background can be seen, and the information of the anti-counterfeiting pattern and the anti-counterfeiting thread background irradiated by visible light can also be seen, that is, the anti-counterfeiting image is affected by stray light. Fig. 13 shows the information of the back side of the canvas irradiated by ultraviolet light, the bright color is visible light excited by the ultraviolet light, the dark image is stray light in the ultraviolet light, and the image is not pure.
Example one
Optionally, the light source 10 is plural, at least one light source 10 emits deep ultraviolet light, and at least one light source 10 emits at least one of visible light, infrared light, and ultraviolet light. In the present embodiment, the light source emitting deep ultraviolet light is the first light source 11, and the light source emitting visible light, infrared light, and ultraviolet light is the second light source. The first light source 11 only emits deep ultraviolet light, which can ensure the intensity of the emitted deep ultraviolet light to ensure that the deep ultraviolet light can excite the fluorescence information on the object to be scanned. The second light source 12 can be used for imaging and conventional anti-counterfeiting scanning, so that the contact image sensor in the application can identify various anti-counterfeiting information, and the working diversity of the contact image sensor is increased.
It should be noted that the first light source 11 and the second light source 12 are lighted at different time intervals, and the light sources 10 that are different at different time intervals are lighted, so that the first light source 11 and the second light source 12 respectively process image information.
It should be noted that the ultraviolet light mentioned in the present application is ultraviolet light with a wavelength of more than 350nm, and does not include deep ultraviolet light. The ultraviolet light is used for conventional anti-counterfeiting identification, and the deep ultraviolet light is used for fluorescent anti-counterfeiting identification in the application. This can increase the range of use of the contact image sensor.
As shown in fig. 1, the imaging device 30 includes a lens 31, a photoelectric conversion chip 32, and a circuit board 33, the lens 31 is located below the light-transmitting glass 20, and the lens 31 is located in the middle of the contact image sensor; the photoelectric conversion chip 32 is positioned below the lens 31 and is arranged opposite to the lens 31; the circuit board 33 is disposed below the photoelectric conversion chip 32, and is electrically connected to the photoelectric conversion chip 32. The light emitted by the light source 10 irradiates on an object to be scanned and is reflected by the object to be scanned to form reflected light with information of the object to be scanned, the reflected light enters the lens 31, the lens 31 converges the reflected light with the information of the object to be scanned and then sends the reflected light to the photoelectric conversion chip 32, the photoelectric conversion chip 32 converts an optical signal into an electric signal and then transmits the electric signal to the circuit board 33, image information is formed on the circuit board, and anti-counterfeiting information on the object to be scanned is identified by observing the image information. Placing the lens 31 in the middle of the contact image sensor facilitates the lens 31 to collect the reflected light, avoiding information omission of the object to be scanned. The photoelectric conversion chip 32 is arranged right below the lens 31, so that the converged reflected light can be completely and quickly transmitted to the photoelectric conversion chip 32, and the integrity of the information of the object to be scanned carried by the reflected light is ensured. The circuit board 33 is electrically connected to the photoelectric conversion chip 32 so that an electrical signal formed by the photoelectric conversion chip 32 can be transmitted onto the circuit board 33.
The lens 31 is located in the middle of the contact image sensor, and is not located in the middle of the contact image sensor, but only in a region in the middle of the contact image sensor.
As shown in fig. 1, the imaging device 30 further includes an interface 34, and the interface 34 is provided on the circuit board 33 to transmit an electrical signal. The electric signal received by the circuit board 33 is transmitted through the interface 34 to form image information, and the anti-counterfeiting information on the object to be scanned is identified through the image information.
In the embodiment shown in fig. 1, when there are two light sources 10, the two light sources 10 are respectively located at two sides of the lens 31. Since the lens 31 is used for collecting the reflected light, the object to be scanned is placed above the lens 31, and the first light source 11 and the second light source are respectively symmetrically arranged at two sides of the lens 31 so as to be irradiated on the object to be scanned, which is beneficial to imaging.
As shown in fig. 1, the contact image sensor further includes a frame 50, the frame 50 has a receiving cavity 51, and the light source 10, the transparent glass 20 and the imaging device 30 are all located in the receiving cavity 51. The arrangement of the frame 50 provides an accommodation space for the light source 10, the transparent glass 20 and the imaging device 30, and the frame 50 can protect the light source 10, the transparent glass 20 and the imaging device 30, so that the contact image sensor can stably operate.
Optionally, the wavelength of the deep ultraviolet light is greater than or equal to 210 nanometers and less than or equal to 365 nanometers. The arrangement can ensure that the deep ultraviolet light can excite the fluorescent anti-counterfeiting information, so that the contact type image sensor can identify various anti-counterfeiting information, and the use diversity of the contact type image sensor is increased.
Preferably, the wavelength of the deep ultraviolet light is 310 nanometers.
The anti-counterfeiting device comprises the contact type image sensor. The anti-counterfeiting device can not only scan the visible information of the object to be scanned, but also scan various anti-counterfeiting information, and the anti-counterfeiting information can comprise one or more different fluorescent information.
In the present embodiment, the first light source 11 is an array light source, and the second light source 12 is a light guide bar light source.
Example two
The difference from the first embodiment is the arrangement of the narrow-band filter.
As shown in fig. 2, when there are a plurality of light sources 10, the contact image sensor further includes a narrow band filter 40, and the narrow band filter 40 is located in the emitting direction of the light source 10 that emits deep ultraviolet light. The narrow-band filter 40 can transmit the deep ultraviolet light and filter out stray light with a wavelength longer than that of the deep ultraviolet light. Fig. 14 is a graph of spectral characteristics of a narrow-band filter, which is used in the present application to illustrate that the narrow-band filter is capable of transmitting deep ultraviolet light but is incapable of transmitting light longer than the wavelength of deep ultraviolet light.
Because ultraviolet light still has the production of miscellaneous light such as visible light except main shortwave under the heavy current, can filter the miscellaneous light that the wavelength is greater than the deep ultraviolet light through installing narrowband filter 40 additional, narrowband filter 40 sets up the deep ultraviolet light that makes first light source 11 take place purer, and the fluorescence information that arouses in waiting to scan is purer, can demonstrate pure fluorescence pattern, and there is not miscellaneous colour such as background colour. Compared with the embodiment, the anti-counterfeiting image formed by the embodiment is clearer and has no stray light influence.
EXAMPLE III
The difference from the first embodiment is that the number of light sources 10 is different.
In the embodiment shown in fig. 3, the light source 10 is one, the light source 10 is a multispectral light source, and the light source 10 emits at least one of visible light, infrared light, and ultraviolet light, as well as deep ultraviolet light. The contact image sensor in the third embodiment has the advantages of small volume, simple structure and low cost compared with the first embodiment. In this embodiment, the light source 10 is a large single light source structure.
Example four
The difference between the fourth embodiment and the third embodiment is that the number of light sources 10 is different.
In the embodiment shown in fig. 4, the first light source 11 is a light guide strip light source, the second light source 12 is also a light guide strip light source, the light intensity emitted by the light guide strip light source is larger, the signal identification capability is strong, and the cost is relatively low. The light source 10 in the present embodiment has a larger light emission intensity than the structure in the third embodiment.
EXAMPLE five
The difference from the second embodiment is that the first light source 11 has a different structure.
In the embodiment shown in fig. 5, the first light source 11 is a light guide strip light source, and a narrow-band filter 40 is installed outside the light guide strip light source. Compared with the second embodiment, the fifth embodiment has lower cost and smaller volume.
As shown in fig. 6, the first light source 11 in the present embodiment is composed of an LED light emitting portion 111 and a light guide 112, and the narrow band filter 40 is located between the LED light emitting portion 111 and the light guide 112. The light emitted by the LED light emitting unit 111 is filtered by the narrow band filter 40 to leave only deep ultraviolet light, and then is guided by the light guide 112, and uniformly irradiates the transparent glass 20 to scan the object to be scanned, so as to excite the fluorescence information on the object to be scanned and generate a simple fluorescence image.
It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A contact image sensor, comprising:
a light source (10), the light source (10) emitting at least deep ultraviolet light;
the scanning device comprises a light-transmitting glass (20), wherein a light source (10) is positioned on one side of the light-transmitting glass (20), light emitted by the light source (10) is emitted to the light-transmitting glass (20), an object to be scanned is placed on the other side of the light-transmitting glass (20), and the light emitted by the light source (10) is reflected to form reflected light;
the imaging device (30) and the light source (10) are positioned on the same side of the light-transmitting glass (20), and the reflected light enters the imaging device (30) for imaging.
2. The contact image sensor according to claim 1, wherein the light-transmissive glass (20) is quartz glass.
3. The contact image sensor according to claim 1,
the number of the light sources (10) is multiple, at least one light source (10) emits the deep ultraviolet light, and at least one light source (10) emits at least one of visible light, infrared light and ultraviolet light; or
The light source (10) is one, the light source (10) is a multispectral light source, and the light source (10) emits the deep ultraviolet light and at least one of visible light, infrared light and ultraviolet light.
4. A contact image sensor according to claim 3, wherein when the light source (10) is plural, the contact image sensor further comprises a narrow band filter (40), and the narrow band filter (40) is located in an emission direction of the light source (10) emitting the deep ultraviolet light.
5. The contact image sensor according to claim 3, wherein when the light source (10) is plural, the light source (10) emitting the deep ultraviolet light may be one of an array light source and a light guide bar light source.
6. The contact image sensor according to any one of claims 1 to 5, wherein the imaging device (30) comprises:
a lens (31), the lens (31) being located below the light-transmitting glass (20);
the photoelectric conversion chip (32) is positioned below the lens (31) and is arranged opposite to the lens (31);
a circuit board (33), the circuit board (33) being disposed below the photoelectric conversion chip (32) and electrically connected to the photoelectric conversion chip (32).
7. The contact image sensor according to claim 6, wherein the imaging device (30) further comprises an interface (34), the interface (34) being provided on the circuit board (33) to transmit an electrical signal out.
8. The contact image sensor according to claim 6, wherein when there are two light sources (10), the two light sources (10) are respectively located on both sides of the lens (31).
9. The contact image sensor according to any one of claims 1 to 5, further comprising a frame (50), wherein the frame (50) has a receiving cavity (51), and wherein the light source (10), the light-transmissive glass (20) and the imaging device (30) are located in the receiving cavity (51).
10. The contact image sensor according to any one of claims 1 to 5, wherein the wavelength of the deep ultraviolet light is 210 nm or more and 365 nm or less.
11. A security device comprising a contact image sensor according to any one of claims 1 to 10.
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| CN201922495577.5U CN210927718U (en) | 2019-12-31 | 2019-12-31 | Contact image sensor and anti-counterfeiting device |
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| CN201922495577.5U CN210927718U (en) | 2019-12-31 | 2019-12-31 | Contact image sensor and anti-counterfeiting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113570773A (en) * | 2021-07-09 | 2021-10-29 | 敦南科技（无锡）有限公司 | Multi-light source image sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113570773A (en) * | 2021-07-09 | 2021-10-29 | 敦南科技（无锡）有限公司 | Multi-light source image sensor |
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