FORM-2
THE PATENT ACT,1970
(39 OF 1970)
AND
THE PATENT RULES, 2003
(As Amended)
COMPLETE SPECIFICATION (See section 10;rule 13)
"OPTICAL ILLUMINATION SYSTEM FOR VEIN PATTERN ANALYSIS"
Mantra Softech India Pvt Ltd., a corporation organized and existing under the laws of India, of B-203, Shapath Hexa, Opp. Gujarat High Court, S. G. Highway, Sola, Ahmedabad - 380060, India.
The following specification particularly describes the invention and the manner in which it is to be performed:

OPTICAL ILLUMINATION SYSTEM FOR VEIN PATTERN ANALYSIS
FIELD OF INVENTION
This invention relates to biometric devices, more specifically, an optical illumination system that finger or palm vein analysis, which is freed of any mechanical scanning or without constraining movement the hand for data analysis.
BACKGROUND OF THE INVENTION
In the current scenario, personal identification is of high importance in different various circumstances. As one of the techniques for precisely detecting personal ID, biometrics is practiced in which each person is authenticated using uniqueness associated with a particular body human body part of each person, for example, fingerprint, vein patterns, eye retina pattern, or even face detection. In this category, analyzing vein pattern by illuminating the finger is highly preferred by many since its difficult to manipulate the vein pattern in a person’s palm or fingers. However, analyzing vein pattern by illuminating the finger or palm with a full light beam without any pattern generation for review is crucial due to low contrast. This is due to multiple scattered light interference when light travels through a volume of the finger or palm.
Prior art US patent number 8855378B2 detects the vein pattern, which involves the principle of hand motion with multiple readings in time and complex data analysis. Here, an imaging element receives reflection light from the palm and converts the reflection light to an electric signal indicating an image of the palm to output the electric signal. When an image of the palm is picked up by this imaging device, an authenticated person moves and monotonically brings the palm closer to the imaging device while holding the palm over the imaging device. However, there is the problem of multiple scattered light interference that reduces the contrast in the pattern formation. Moreover, some of the current products in the market also works on a line scan laser, which involves scanning the laser beam over the palm. Therefore, there is a long felt and unresolved need for a finger or palm vein pattern scanner optics that is freed of any mechanical scanning or without constraining movement the hand for data analysis.
SUMMARY OF THE INVENTION

The following presents a simplified summary of the subject matter in order to provide a basic understanding of some of the aspects of subject matter embodiments. This summary is not an extensive overview of the subject matter. It is not intended to identify key/critical elements of the embodiments or to delineate the scope of the subject matter. Its sole purpose to present some concepts of the subject matter in a simplified form as a prelude to the more detailed description that is presented later.
An optical illumination system addresses the above-mentioned need for a finger or palm vein pattern scanner optics that is freed of any mechanical scanning or without constraining movement the hand for data analysis. The optical illumination system comprises electronically controlled discrete light sources, collimating lens, a lens array, an imaging optical module, and a detector. The light sources are supported by the collimating lens to generate discrete angular beams, and the discrete angular beams produce an irradiance pattern via the lens array. The lens array is positioned below the light source to produce the irradiance pattern based on veins on a palm positioned below the lens array, and the irradiance pattern is generated when the discrete angular beams from the light source are emitted through the lens array. The imaging optical module is positioned below the palm to capture the irradiance pattern in the form of an optical irradiance distribution on a detector positioned below the imaging optical module. The detector is synchronized with the light sources to convert the optical irradiance distribution into an electrical signal, where each frame of image generated from the detector with selective pixels correspond to a particular frame for a selected light source that is ON and rest light sources are OFF. A summation of data comprising the frames allows to reconstruct vein pattern of the palm or finger and to generate a complete vein pattern data.
In an embodiment, the light sources comprise multiple light emitting bulbs that are point based. The collimating lens along with the light sources produce a collimating beam that comprises a different wavelength and a different field angle relative to the optical axis. The lens array is a crossed cylindrical lens array that produces the irradiance pattern in form of cells that are defined in rows and columns based on the vein pattern on the surface of the palm, where the rows and columns are defined as dark and bright illumination cells in the irradiance pattern on the surface

of the palm. The irradiance pattern comprises one of a square structured and rectangular structured cell patterns.
In an embodiment, the irradiance pattern in the form of the cells defined in rows and columns is generated by the light sources that are sequentially time-controlled to reduce contrast loss and improve image quality of the irradiance based on the vein pattern in the palm on a placement area of the palm. The multiple light sources comprise same wavelength and is controlled electronically for independently switching ON and switching OFF. The multiple light sources comprise different wavelength and is controlled electronically for independently or simultaneously switching ON and switching OFF. The detector is an opto-electronic two-dimensional photodiode array detector that is monochrome based. In an embodiment, the detector is an opto-electronic two-dimensional photodiode array detector that is one of an RGB filter array and selective filter array based.
In an embodiment, spatial arrangement and number of the light sources depend on chromatic characteristics of the opto-electronic two-dimensional photodiode array detector. The discrete light sources that are arranged in a focal plane of the collimated lens produce independent collimated beams with different angle with respect to an optical axis, where the lens array modifies the collimated beams and produces one of square and rectangular patches type irradiance pattern on a plane of the placement area of the palm. In an embodiment, during each instant, gaps in illumination patches generated by the light source are shifted spatially by controlling the light sources to avoid scattering of light along the veins of the palm while detecting using the detector for contrast. The light sources comprising different wavelengths and spatial arrangement of each light source in the focal plane of the lens array depends on type of colour filter array used in the detector, wherein the light sources are ON simultaneously and a single frame of the detector is used for analysis of the palm vein pattern.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The following drawings are illustrative of particular examples for enabling systems and methods of the present disclosure, are descriptive of some of the methods and mechanism, and are not

intended to limit the scope of the invention. The drawings are not to scale (unless so stated) and are intended for use in conjunction with the explanations in the following detailed description.
Figure 1 shows a front perspective view of the optical illumination system, as an example embodiment of the present disclosure.
Figure 2A shows a front perspective view showing placement of the discrete light sources and crossed cylindrical lens array in different view planes, as an example embodiment of the present disclosure.
Figure 2B shows a side perspective view showing placement of the discrete light sources and crossed cylindrical lens array in different view planes, as an example embodiment of the present disclosure.
Figure 2C shows a top perspective view showing placement of the discrete light sources, as an example embodiment of the present disclosure.
Figure 3 shows the optical path associated with the optical illumination system, in X-Z plane, as an example embodiment of the present disclosure.
Figure 4 shows the optical path associated with the optical illumination system in Y-Z plane, as an example embodiment of the present disclosure.
Figure 5 shows the irradiance pattern generated using the optical illumination system on the finger or palm surface when the first light source is ON, as an example embodiment of the present disclosure.
Figure 6 shows the irradiance pattern generated using the optical illumination system on the finger or palm surface when the second light source is ON, as an example embodiment of the present disclosure.

Figure 7 shows the irradiance pattern generated using the optical illumination system on the finger or palm surface when the third light source is ON, as an example embodiment of the present disclosure.
Figure 8 shows the irradiance pattern generated using the optical illumination system on the finger or palm surface when the fourth light source is ON, as an example embodiment of the present disclosure.
Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may represent both hardware components of the system. Further, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.
DETAILED DESCRIPTION
Exemplary embodiments now will be described. The disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey its scope to those skilled in the art. The terminology used in the detailed description of the particular exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting. In the drawings, like numbers refer to like elements.
It is to be noted, however, that the reference numerals used herein illustrate only typical embodiments of the present subject matter, and are therefore, not to be considered for limiting of its scope, for the subject matter may admit to other equally effective embodiments.
The specification may refer to “an”, “one” or “some” embodiment(s) in several locations. This does not necessarily imply that each such reference is to the same embodiment(s), or that the feature only applies to a single embodiment. Single features of different embodiments may also be combined to provide other embodiments.

As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless expressly stated otherwise. It will be further understood that the terms “includes”, “comprises”, “including” and/or “comprising” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being “connected” or “coupled” to another element, it can be directly connected or coupled to the other element or intervening elements may be present. Furthermore, “connected” or “coupled” as used herein may include operatively connected or coupled. As used herein, the term “and/or” includes any and all combinations and arrangements of one or more of the associated listed items.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Figure 1 shows a front perspective view of the optical illumination system 100, as an example embodiment of the present disclosure. The optical illumination system 100 comprises electronically controlled discrete light sources 102, collimating lens 104, lens array 106, an imaging optical module 108, and a detector 110. The light sources 102 are supported by the collimating lens 104 to generate discrete angular beams, and the discrete angular beams produce an irradiance pattern 502 via the lens array 106. The lens array 106 is positioned below the light source 102 to produce the irradiance pattern 502 based on veins on a palm 112 positioned below the lens array 106, and the irradiance pattern 502 is generated when the discrete angular beams from the light source 102, collimating lens 104 are emitted through the lens array 106. The imaging optical module 108 is positioned below the palm 112 to capture the irradiance pattern 502 in the form of an optical irradiance distribution on the detector 110 positioned below the

imaging optical module 108. The detector 110 is synchronized with the light sources 102 to convert the optical irradiance distribution into an electrical signal, where each frame of image generated from the detector 110 with selective pixels correspond to a particular frame for a selected light source 102 that is ON and rest light sources 102 are OFF. A summation of data comprising the frames allows to reconstruct vein pattern of the palm 112 or finger and to generate a complete vein pattern data.
Referring to Figures 2A-2C, Figure 2A shows a front perspective view showing placement of the discrete light sources 102a, 102b, 102c, and 102d, and crossed cylindrical lens array 106 in different view planes. Figure 2B shows a side perspective view showing placement of the discrete light sources 102a, 102b, 102c, and 102d, and crossed cylindrical lens array 106 in different view planes. Figure 2C shows a top perspective view showing placement of the discrete light sources 102a, 102b, 102c, and 102d. In an embodiment, the light sources 102a, 102b, 102c, and 102d comprise multiple light emitting bulbs that are point based. The collimating lens 104 along with the light sources 102a, 102b, 102c, and 102d, produce a collimating beam that comprises a different wavelength and a different field angle relative to the optical axis 114. The lens array 106 is, for example, a crossed cylindrical lens array that produces the irradiance pattern 502 in form of cells that are defined in rows and columns based on the vein pattern on the surface of the palm 112, where the rows and columns are defined as dark and bright illumination cells in the irradiance pattern 502 on the surface of the palm 112, as shown in Figures 5-8. As shown in Figures 5-8, the irradiance pattern 502 comprises one of a square structured and rectangular structured cell patterns. In an example, the finger or palm 112 placement area, where the user places his/her finger or palm 112 is a non-contact surface without any support material or it is a contact surface with supporting glass plate or any suitable component.
Referring to Figures 3 and 4, Figure 3 shows the optical path associated with the optical illumination system 100, in X-Z plane and Figure 4 shows the optical path associated with the optical illumination system 100 in Y-Z plane. In an embodiment, the irradiance pattern 502 in the form of the cells defined in rows and columns is generated by the light sources 102a, 102b, 102c, and 102d that are sequentially time-controlled to reduce contrast loss and improve image quality of the irradiance based on the vein pattern in the palm 112 on a placement area of the

palm 112. The multiple light sources 102a, 102b, 102c, and 102d comprise same wavelength and is controlled electronically for independently switching ON and switching OFF. The multiple light sources 102a, 102b, 102c, and 102d comprise different wavelength and is controlled electronically for independently or simultaneously switching ON and switching OFF. The detector 110 is an opto-electronic two-dimensional photodiode array detector that is monochrome based. In another embodiment, the detector 110 is an opto-electronic two-dimensional photodiode array detector that is one of an RGB filter array and selective filter array based.
Referring to Figures 5-8, Figure 5 shows the irradiance pattern 502a generated using the optical illumination system 100 on the finger or palm 112 surface when only the first light source 102a is ON. Figure 6 shows the irradiance pattern 502b generated using the optical illumination system 100 on the finger or palm 112 surface when only the second light source 102b is ON. Figure 7 shows the irradiance pattern 502c generated using the optical illumination system 100 on the finger or palm 112 surface when only the third light source 102c is ON. Figure 8 shows the irradiance pattern 502 generated using the optical illumination system 100 on the finger or palm 112 surface when only the fourth light source 102d is ON.
In an embodiment, spatial arrangement, and number of the light sources 102a, 102b, 102c, and 102d depend on chromatic characteristics of the opto-electronic two-dimensional photodiode array detector 110. The discrete light sources 102a, 102b, 102c, and 102d that are arranged in a focal plane of the collimated lens 104 produce independent collimated beams with different angle with respect to an optical axis 114, where the lens array 106 modifies the collimated beams and produces one of square and rectangular patches type irradiance pattern 502 on a plane of the placement area of the palm 112. In an embodiment, during each instant, gaps in illumination patches generated by each light source 102a, 102b, 102c, and 102d are shifted spatially by controlling the light sources 102a, 102b, 102c, and 102d to avoid scattering of light along the veins of the palm 112 while detecting using the detector 110 for contrast. The light sources 102a, 102b, 102c, and 102d comprising different wavelengths and spatial arrangement of each light source 102a, 102b, 102c, and 102d in the focal plane of the lens array 106 depends on type of colour filter array used in the detector 110, where the light sources 102a, 102b, 102c, and 102d

are ON simultaneously and a single frame of the detector 110 is used for analysis of the palm 112.
Based on Figures 1-8, in a first embodiment, the discrete light sources 102a, 102b, 102c, and 102d are arranged in the focal plane of the collimated lens 104 to produces independent collimated beams with different angle with respect to the optical axis 114. The crossed cylindrical lens array 106 modifies the collimated beam and produces square or rectangular patches type irradiance in the plane of finger or palm 112 placement area. By switching ON the light sources 102a, 102b, 102c, and 102d which are as arranged in Figure 2C, sequentially in time, produces a corresponding irradiance pattern 502 in the plane of finger or palm 112 placement area shown in Figures 5-8. In each instant the gaps in the illumination patches, which are shifted spatially by controlling the light sources 102a, 102b, 102c, and 102d help to avoid scattering of light in side-by-side portions along the veins in the finger or palm 112 while detecting with the detector 110 for good contrast.
In a second embodiment, light sources 102a, 102b, 102c and 102d are with different wavelengths and the spatial arrangement of each light source 102a, 102b, 102c, and 102d in the focal plane of the collimating lens 104 depends on the type of colour filter array used in the opto-electronic two-dimensional photodiode array detector 110. In this case all light sources 102a, 102b, 102c, and 102d and collimating lens 104 are ON simultaneously and a single frame of the opto-electronic two-dimensional photodiode array detector 110 is enough for the finger or palm 112 vein analysis.
Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternate embodiments of the invention, will become apparent to persons skilled in the art upon reference to the description of the invention. It is therefore, contemplated that such modifications can be made without departing from the spirit or scope of the present invention as defined.

We Claim:
1. An optical illumination system comprising:
electronically controlled discrete light sources that are supported by a collimating lens to generate discrete angular beams, and wherein the discrete angular beams produce an irradiance pattern via a lens array, wherein the lens array is positioned below the light source to produce the irradiance pattern based on veins on a palm positioned below the lens array, and wherein the irradiance pattern is generated when the discrete angular beams from the light source are emitted through the lens array;
an imaging optical module positioned below the palm captures the irradiance pattern in the form of an optical irradiance distribution on a detector positioned below the imaging optical module; and
the detector is synchronized with the light sources to convert the optical irradiance distribution into an electrical signal, wherein each frame of image generated from the detector with selective pixels correspond to a particular frame for a selected light source is ON and rest light sources are OFF, and wherein one or combination of summation and processing of data comprising the frames allows to reconstruct vein pattern of the palm or finger and to generate a complete vein pattern data.
2. The optical illumination system as claimed in claim 1, wherein the light sources comprise multiple light emitting bulbs that are point based.
3. The optical illumination system as claimed in claim 1, wherein the collimating lens along with the light sources produce a collimating beam that comprises a different wavelength and a different field angle relative to the optical axis.
4. The optical illumination system as claimed in claim 1, wherein the lens array is a crossed cylindrical lens array that produces the irradiance pattern in form of cells that are defined in rows and columns based on the vein pattern on the surface of the palm, wherein the rows and columns are defined as dark and bright illumination cells in the irradiance pattern on the surface of the palm.

5. The optical illumination system as claimed in claim 4, wherein the irradiance pattern comprises one of a square structured and rectangular structured cell patterns.
6. The optical illumination system as claimed in claim 4, wherein the irradiance pattern in the form of the cells defined in rows and columns is generated by the light sources that are sequentially time-controlled to reduce contrast loss and improve image quality of the irradiance based on the vein pattern in the palm on a placement area of the palm.
7. The optical illumination system as claimed in claim 1, wherein the multiple light sources comprise same wavelength, and is controlled electronically for independently switching ON and switching OFF.
8. The optical illumination system as claimed in claim 1, wherein the multiple light sources comprise different wavelength, and is controlled electronically for one of independently and simultaneously switching ON and switching OFF.
9. The optical illumination system as claimed in claim 1, wherein the detector is an opto-electronic two-dimensional photodiode array detector that is monochrome based.
10. The optical illumination system as claimed in claim 1, wherein the detector is an opto-electronic two-dimensional photodiode array detector that is one or combination of an RGB filter array based and a selective filter array based.
11. The optical illumination system as claimed in claim 9, wherein spatial arrangement and number of the light sources depend on chromatic characteristics of the opto-electronic two-dimensional photodiode array detector.
12. The optical illumination system as claimed in claim 1, wherein the discrete light sources that are arranged in a focal plane of the collimated lens produce independent collimated beams with different angle with respect to an optical axis, wherein the lens array modifies the

collimated beams and produces one of square and rectangular patches type irradiance pattern on a plane of the placement area of the palm.
13. The optical illumination system as claimed in claim 1, wherein during each instant, gaps in illumination patches generated by the light source are shifted spatially by controlling the light sources to avoid scattering of light along the veins of the palm while detecting using the detector for contrast.
14. The optical illumination system as claimed in claim 12, wherein the light sources comprising different wavelengths and spatial arrangement of each light source in the focal plane of the lens array depends on type of colour filter array used in the detector, wherein the light sources are ON simultaneously and a single frame of the detector is used for analysis of the palm.