Photo readers device

 

The invention relates to photo readers devices. Its application in the device authentication of banknotes and documents allows to obtain a technical result in the form of a uniform illumination of the object. This result is achieved due to the fact that the device comprises a pair of radiation sources, each of which is addressed to the first end of the corresponding side of the light guide placed on opposite sides of the Central waveguide and the radiation detector, converted to one end of the Central conductor, the second end facing the illuminated area of the object. When this second lateral ends of all optical fibers optically connected to the Central light guide away from its second end at an acute angle to the direction of its first end at the junction, and also the side surfaces of all the optical fibers are made of a diffuse reflective in the wavelength range of all of the used radiation. 5 C.p. f-crystals, 2 Il.

The invention relates to photo readers devices and can be used for the perception of images with different lighting objects by radiation lying in the visible range STI, this invention can be applied in devices for authentication of banknotes and other valuable documents.

The existing level of technology currently, valuable documents, in particular banknotes, bear various protective elements. One such protective elements is available on a protected document image made paint with a special effect, for example, luminescense in the visible wavelength range under the action of infrared radiation (U.S. patent 5463212, G 06 K 7/10, 31.10.1995), or giving the image irradiation of infrared radiation, while the rest of the document such images does not (PCT application WO 95/13597, CL G 07 D 7/00, 18.05.1995). For the perception of such (or similar) radiation using different photo readers.

So, it is known a device for controlling the authenticity of banknotes, in which there are radiators in the form of infrared LEDs and the receiver of the reflected radiation, installed coaxial-collinear angle to the vertical axis (a utility model certificate of the Russian Federation 15040, CL G 07 D 7/00, 10.09.2000). However, this device does not provide uniform illumination controlled banknotes, resulting resulting izobrazevalno pairs of radiation sources, each of which is addressed to the first end of the corresponding side of the light guide placed on opposite sides of the Central fiber and the receiver of the reflected radiation is directed toward one end of the Central conductor, the second end facing the illuminated area of the object (the PCT application WO 97/26616, CL G 07 D 7/00, 24.07.1997). This device provides a relatively uniform illumination of a controlled document through the use of two groups of radiation sources arranged perpendicular to the long side of the controlled document (banknotes). However, as can be seen from Fig.1, showing charts 11 and 12 of one pair of radiation sources 14 and 15 of the radiation in this device, the total illumination 13 document 16 between the two sources of this pair turns out to still uneven.

The invention is Therefore a purpose of this invention is to provide a photo readers device free from the above disadvantages, i.e. providing the technical result in the form of a uniform illumination of the object.

This problem is solved with the achievement of the technical result in the present invention, which is a photo is to the first end of the corresponding side of the light guide, placed on opposite sides of the Central waveguide and the radiation detector, converted to one end of the Central conductor, the second end facing the lighted portion of the study object, and second lateral ends of all optical fibers optically connected to the Central light guide away from its second end at an acute angle to the direction of its first end at the junction, and also the side surfaces of all the optical fibers are made of a diffuse reflective in the wavelength range of all of the used radiation.

An additional distinction of the present invention is that all the fibers are made almost round in cross section. In particular, they may all have the same diameter.

One additional difference between the present invention is that all the fibers are made hollow or made of a material that is transparent in the wavelength range of all of the used radiation.

Finally, another difference of the present invention is that the angle between the second ends of the lateral optical fibers and the Central fiber and the diffuse reflectance of the side surfaces of all the optical fibers are selected so that dissipation side walls of the fibers radiation the Cai of the radiation receiver, and in the presence of the examined object at the second end of the Central light guide is not obstructed perception with a given accuracy reflected from the test object or generated radiation is specified by radiation receiver.

In the existing prior art revealed no objects that would contain the same set of features as the device of the present invention, can be considered a new one.

In the existing prior art revealed no objects that would contain a set of features that distinguish the present invention from the closest analogue that allows us to consider the invention to involve an inventive step.

A brief description of the drawings Fig. 1 illustrates the distribution of illumination from two sources of radiation in the near equivalent.

Fig.2 is a simplified diagram of the photo readers of the device of the present invention.

A detailed description of the preferred implementation of Fig.2 presents a simplified schematic photo readers of the device illustrating the basic principles underlying the present invention.

Photo readers the device according to Fig.2 includes a Central optical fiber 1 and at least one is 1, to the first end of which facing the receiver 3 of the reflected radiation. To the first end of each of the side optical fibers 2 facing the corresponding radiation source 4. In this description, the term "facing" means that the receiver 3 is directed to the first end of the Central light guide 1, to perceive coming from this Central light guide 1 radiation; similarly, each radiation source 4 is directed to the first end of the corresponding side of the light guide 2, to send his rays. The radiation sources 4 can be, for example, LEDs, and a receiver 3 of the radiation can be, for example, a matrix of charge-coupled devices (CCD), producing images or photocell perception only of the radiation intensity.

The second end of the Central light guide 1 is turned to the lighted section 6 of the investigated object 5. The latter ends of the side optical fibers 2 are optically connected to the Central optical fiber 1 at a predetermined remove L from its second end and positioned at an acute angleformed at the junction relative to the direction of the first end of the Central light guide 1. The side surfaces of all the optical fibers 1 and 2 is made diffuse th, reflected from the test object 5, or resulting from his exposure to radiation sources 4 (i.e., generated by this test object 5).

The optical fibers 1 and 2 can be a hollow channels, and channels, which are made of a material which is transparent in the wavelength range of all of the used radiation. For example, the optical fibers 1 and 2 can be made of a transmissive all used radiation material in the form shown in Fig.2 fork, or they can be made of hollow tubes connected at an acute angle, as shown in Fig.2. These fibers may in principle have any shape in cross section, but preferably they are almost round in cross section and of the same diameter.

The side surfaces of all the optical fibers 1 and 2 to provide diffuse reflection inside can be processed accordingly. For example, in the case of manufacturing optical fibers 1 and 2 of the optically transparent material of the side surfaces can be made opaque, and in the case of manufacturing optical fibers 1 and 2 of the hollow tubes of the inner parts of these tubes can have an appropriate floor, scattering the light.

The number of lateral optical fibers 2 can be greater than two. For example, the side of the light guide 2 may be h is roznych sides for each pair.

The distance L by which the connection side fibers 2 with a Central optical fiber 1 is removed from the second end of the Central light guide 1, and the transverse size and the degree of diffusely side walls of the optical fibers 1 and 2 are selected so as to provide uniform illumination of the investigated object 5 within the illuminated device section 6 of the surface of the object. On the other hand, all of the above parameters, as well as the length of the Central light guide 1 can be chosen so that dissipation side walls of the optical fibers 1 and 2 emissions from sources 4 in the absence of the investigated object 5 was sufficient for calibration of the receiver 3 radiation, and in the presence of the examined object 5 at the second end of the Central optical fiber 1 does not preclude the perception of the receiver 3 of the radiation that is reflected from the test object 5 or generated them.

Photo readers the device according to the present invention operates as follows.

The analyzed object 5 (e.g., bill) is placed directly beneath the second end of the Central light guide 1 and include the radiation sources 4. Created their radiation due to multiple internal reflections from the side walls of the light guide is a mineral fiber 1 at the output of its second end. This radiation is either reflected from the object surface 5, or causes a corresponding radiation with a different wavelength depending on the dye or pigment. This is the reverse of the radiation passes through the Central fiber 1 almost without scattering to the receiver 3 radiation and registered them. Received by the receiver 3, the signal for further processing in the respective devices, which are not shown, because they are not the subject of the present invention and is not included in the scope of patent claims.

The device according to the present invention may be calibrated directly in the process. It is enough to delete the analyzed object 5 when the radiation sources 4. Then part of the radiation scattered by the side walls of the optical fibers 1 and 2 will be included in the receiver 3 radiation and can be fixed device further processing as a zero emission level. When the location of the investigated object 5 under the second end of the Central light guide 1 of the read image is automatically deducted this zero level. Thus, the reading accuracy can be improved.

Industrial applicability the Present izobreteny the e image may change their characteristics depending on the irradiation light with the other wavelength.

Although the invention is described using the example of a particular implementation, the considered design is shown only to illustrate the basic principle underlying the present invention. This description in no way limits the scope of patent claims, defined only by the applied claims.

Claims

1. Photo readers device containing at least one pair of radiation sources, each of which is addressed to the first end of the corresponding side of the light guide placed on opposite sides of the Central waveguide and the radiation detector, converted to one end of the Central conductor, the second end facing the lighted portion of the study object, wherein the second lateral ends of all optical fibers optically connected to the Central light guide away from its second end at an acute angle to the direction of its first end at the connection point, the side surfaces of all the optical fibers are made of a diffuse reflective in the wavelength range of all of the used radiation.

2. Photo readers the device under item 1, characterized in that all the fibers are made almost kruglogodichny diameter.

4. Photo readers a device according to any one of paragraphs.1-3, characterized in that all the fibers are hollow inside.

5. Photo readers a device according to any one of paragraphs.1-3, characterized in that all the fibers are made of a material which is transparent in the wavelength range of all of the used radiation.

6. Photo readers the device under item 1, characterized in that the angle between the second ends of the lateral optical fibers and the Central fiber and the diffuse reflectance of the side surfaces of all the optical fibers are selected so that dissipation side walls of the fibers radiation in the absence of the investigated object at the second end of the Central fiber was sufficient for the calibration of the above-mentioned radiation detector, and in the presence of the examined object at the second end of the Central light guide is not obstructed perception with a given accuracy reflected from the test object or generated by the radiation of the said radiation receiver.

 

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