JP2003162207A - Optical information reader and optical recording medium - Google Patents

Optical information reader and optical recording medium

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Publication number
JP2003162207A
JP2003162207A JP2001362374A JP2001362374A JP2003162207A JP 2003162207 A JP2003162207 A JP 2003162207A JP 2001362374 A JP2001362374 A JP 2001362374A JP 2001362374 A JP2001362374 A JP 2001362374A JP 2003162207 A JP2003162207 A JP 2003162207A
Authority
JP
Japan
Prior art keywords
information
optical
recording medium
information recording
cgh
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.)
Withdrawn
Application number
JP2001362374A
Other languages
Japanese (ja)
Inventor
Koichiro Nishikawa
浩一郎 西川
Original Assignee
Victor Co Of Japan Ltd
日本ビクター株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Victor Co Of Japan Ltd, 日本ビクター株式会社 filed Critical Victor Co Of Japan Ltd
Priority to JP2001362374A priority Critical patent/JP2003162207A/en
Publication of JP2003162207A publication Critical patent/JP2003162207A/en
Application status is Withdrawn legal-status Critical

Links

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical information reader which positions an information recording part without using a special mechanism, and to provide an optical recording medium. <P>SOLUTION: The optical information reader is provided with a light emitting means 52 which irradiates the information recording part 10 of the optical recording medium 1 with monochromatic light 61, a display window 55 to display reproduction information on a diffracted light beam 62 which monochromatic light emitted to the information recording part is diffracted, and an optical system which guides the diffracted light beam diffracted by the information recording part and images it on the display window. At least either the relative position or the inclination of the optical recording medium with respect to the information recording part is made adjustable from the outside on the basis of the reproduction information displayed on the display window. The optical recording medium has the information recording part on which information is recorded with a CGH (computer generated hologram). A marker CGH on which an indicator is recorded to direct the central direction of the information recording part is disposed on the peripheral part of the information recording part, or a data CGH and a marker CGH are alternately disposed in each lengthwise and crosswise divided region. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an optical recording medium on which information is recorded as a hologram image and an optical information reading apparatus for reading information from the optical recording medium. The present invention relates to an optical recording medium such as an authenticated card product which is excellent in prevention of identification, forgery, and alteration, and an optical information reading device that allows information recorded on the optical recording medium to be visually recognized. [0002] Prepaid cards, credit cards,
For recording media such as cash cards and certification cards,
It is necessary to identify whether the contents or the recording medium itself has been illegally forged or altered. As one method of identifying the recording medium, a hologram is used for a credit card, a bank card, and the like. The hologram enables a single hologram image to be visually recognized by interference of white light. However,
At present, this hologram can record only a single hologram image such as a manufacturer's mark. Therefore, it cannot be said that this hologram has a sufficient function for preventing unauthorized use or forgery, and the amount of recordable information is limited. [0003] For example, credit cards and cash cards with holograms are applied for authentication by visually judging patterns unique to companies and banks. The hologram pattern has a large display area, and the hologram image can be easily distinguished. However, these also lead to easy forgery or alteration of the card. That is, if a hologram can be created, a pseudo image can be produced relatively easily, and it has not been possible to completely prevent the production of a counterfeit product. Accordingly, the present applicant has developed CGH as a recording medium using a hologram effective for preventing unauthorized use and forgery.
An optical recording medium to which (Computer Generated Hologram) is applied (JP-A-10-198259) has been proposed. This optical recording medium is considerably small because one side of each hologram pattern is a region of about several hundreds of micrometers, and can store a large amount of information. Since it is necessary to read only light, it is possible to prevent unauthorized use. [0005] FIG. 13 shows a conventional optical recording medium.
It is an example of arrangement of GH. The CGH recording information of the information recording unit 10 is composed of a collection of square data CGHs 100 on which the same information is recorded. The size of the data CGH 100 recorded in this manner is as small as several hundred μm on one side, but in order to read the data, it is necessary to accurately irradiate the data CHG 100 with a spotlight of a reader. Therefore, in the conventional optical recording medium information reading device, it is necessary to provide a special mooring portion or perform mechanical positioning for positioning the CGH 100 and the reading device. Specific examples of these configurations will be described with reference to FIGS. FIG. 14 shows an example of the configuration of a reading device using a mooring device. Here, the mooring portion 12 is provided at the bottom of the housing 11.
Are integrally formed. Display window 1 on the surface of housing 11
3 is provided, and an opening 14 is provided on the bottom surface of the portion where the mooring portion 12 is formed. Inside the housing 11, a light emitting unit 15 such as a monochromatic laser, a mirror 16 for reflecting the monochromatic light 21 toward the opening 14, and a diffracted light reflected by the CGH of the information recording unit 10 of the optical recording medium 1 Are sequentially reflected and mirrors 17 and 18 are guided to the display window 13. An insertion groove 19 which is parallel to the bottom surface of the housing 11 and has an abutment portion 19a in the depth direction is formed in the mooring portion 12, and when the optical recording medium 1 is inserted into the insertion groove 19 and abuts on the back. The information recording unit 10 is aligned with the opening. At this time, the monochromatic light 21 from the light emitting unit 15 is reflected by the mirror 16 toward the information recording unit 10, further reflected by the CGH of the information recording unit 10, and is a diffracted light having a different reflection direction from the zero-order reflected light 22. 23 is reflected by the mirrors 17 and 18, and image information recorded as CGH in the information recording unit 10 is displayed on the display window 13. FIG. 15 shows an example of the configuration of a device for performing mechanical positioning. The optical recording medium 1 is transported to a predetermined position inside the protective case 31 by transport means (not shown).
The upper surface of the protective case 31 facing the information recording unit 10 of the optical recording medium 1 is partially depressed inward, thereby forming the positioning unit 32 on the surface. Case 3
3 has a display window 34 on its surface, an opening 35 at the bottom thereof, and a projection 36 projecting downward. The projection 36 is provided on the positioning portion 32 of the protective case 31.
And positioning is performed. Inside the housing 33, a light emitting unit 37, a monochromatic reflecting mirror 38 for reflecting the monochromatic light toward the opening 35, and a diffracted light inverting mirror 39 for reflecting the diffracted light from the information recording unit 10 are housed. I have. Also in this device, the monochromatic light 41 from the light emitting section 37
Is reflected by the monochromatic reflection mirror 38 toward the information recording unit 10, and the diffracted light 42 reflected by the CGH of the information recording unit 10 is reflected by the diffraction light inverting mirror 39 toward the display window 34, and this display is performed. The window 34 displays the image information recorded in the information recording unit 10. The mooring section 12 constituting the optical information reading apparatus shown in FIG. 14 and the positioning section 32 and the projecting section 36 constituting the optical reading apparatus shown in FIG. The positioning device has a configuration based on the design of the optical information reading device, and cannot be additionally provided depending on the external appearance or the structure of a product that is available as a product even when requested by a user. was there. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to read optical information which enables positioning of an information recording unit without using a special mechanism such as a mooring unit or a positioning unit. An apparatus and an optical recording medium are provided. It is another object of the present invention to provide an optical information reading apparatus and an optical recording medium which can correct the inclination between the optical recording information reading mechanism and the optical recording medium. Another object of the present invention is to provide an optical recording medium that can be used with an inexpensive optical recording information reading device for reading an optical recording medium to which CGH is applied. Means for Solving the Problems The invention according to claim 1 is:
In an optical information reading device that reads information from an optical recording medium having an information recording unit that can read information from diffracted light obtained by irradiating monochromatic light, light emission that irradiates the information recording unit of the optical recording medium with monochromatic light Means,
A display window that displays reproduction information of diffracted light diffracted by irradiating the information recording unit with monochromatic light, and an optical system that guides the diffracted light diffracted by the information recording unit to form an image on the display window, and displays At least one of the relative position and the inclination of the optical recording medium with respect to the information recording section can be externally adjusted based on the reproduction information displayed on the window. According to a second aspect of the present invention, there is provided an optical recording medium having an information recording section on which information is recorded by CGH, wherein an information reproducing position of the information reproducing position is directed to a periphery of the information recording section in a direction toward the center of the information recording section. A marker CGH on which a sign for guiding movement is recorded is arranged. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the drawings. FIG. 1 is a sectional view showing a schematic configuration of a first embodiment of an optical reading apparatus according to the present invention, together with an optical recording medium. In FIG.
The optical recording medium 1 includes an information recording unit 10 on which a reflective CGH is adhered or molded. The CGH of this information recording unit 10
Has formed a hologram pattern by performing a calculation using a computer such that a plurality of diffraction gratings rotated in a plane including the diffraction grating are arranged so that bright points are arranged two-dimensionally. A reproduced image is obtained from the diffracted light. An apparatus for visually recognizing the image of the hologram recorded on the CGH of the optical recording medium 1, that is, an optical reading apparatus 50 is provided inside a housing 51 having a substantially rectangular parallelepiped shape and a predetermined wavelength such as a monochromatic light laser. A light emitting section (light emitting means) 52 for emitting monochromatic light is accommodated, an opening 54 is formed in a bottom wall 53, and a display window 55 is provided in an upper wall. Here, the opening 54 has a diameter equal to or slightly larger than the formation area of the information recording unit 10 formed of the reflection type CGH, and the light emitting unit 52 has its optical axis with respect to the bottom wall. By attaching it diagonally, the monochromatic light 61
Irradiates the information recording unit 10, and a display window 55 is provided at a position where the diffracted light 62 faces the upper wall. Thereby, the image information of the hologram recorded on the reflection type CGH of the information recording unit 10 of the optical recording medium 1 can be displayed on the display window 55 and visually recognized. FIG. 2 is a plan view showing the configuration of the information recording section of the first embodiment of the optical recording medium according to the present invention. Here, in the information recording unit 10A, the data CGH101 on which image information is recorded is arranged in the center of the CGH area which is substantially square in its entirety, and the data CGH is arranged on the periphery surrounding the center.
A marker CGH 102 in which a sign indicating the direction in which 101 exists is recorded as an image is arranged. FIG. 3 is a plan view showing the configuration of an information recording section of a second embodiment of the optical recording medium according to the present invention. The information recording unit 10B shown here includes a plurality of markers CGH1 separated from each other on substantially the same circumference around the data CGH101.
02 is arranged. An operation for visually recognizing the optical recording medium configured as described above with the above-described optical reading apparatus will be described.
This will be described below with reference to FIGS. 4, 5, 6, and 7.
FIG. 4 shows a state in which the monochromatic light from the light emitting section 52 is irradiated on the area of the data CGH 101 on the optical recording medium 1 and the data pattern 111 of “A” is displayed on the display window 55. In this case, when the monochromatic light 61 is correctly irradiated on the data CGH 101, only the data pattern “A” is displayed on the display window. Hereinafter, the light emitting unit 52
The direction of the diffracted light 62 from the information recording unit 10A toward the display window 55 on the projection plane is defined as the X direction, and the direction orthogonal thereto is defined as the Y direction. FIG. 5 shows a state in which the spot of the monochromatic light 61 from the light emitting section 52 is shifted in the Y direction, deviates from the data CGH 101 and is irradiated on the marker CGH 102, and the marker pattern 112 is displayed on the display window 55. The marker pattern 112 has the shape of an arrow, and indicates that the data CGH 101 exists in the direction of the arrow. This indicates that the optical reading device is shifted in the Y direction. Therefore, if the optical reading device is moved in the −Y direction indicated by the marker pattern 112, the data CGH 101 is irradiated with the spot of the monochromatic light 61, Data CGH101
Are reproduced and displayed on the display window 55. FIG. 6 shows that the optical reading device is shifted in the Y direction,
In addition, it also shows a state in which the spot of the monochromatic light 52 from the light emitting unit 2 irradiates the corner of the peripheral part, shifted to the X direction. In this case, the marker pattern 113 has the shape of an arrow pointing in the direction obtained by combining the -X direction and the -Y direction. Therefore, if the optical reading device is moved in the direction indicated by the marker pattern 113, the monochrome of the area of the data CGH101 is obtained. The spot of the light 61 is irradiated, and the pattern of the data CGH101 is reproduced and displayed on the display window 55. FIG. 7 shows that the spot of monochromatic light from the light emitting section is X
The marker CGH area 102 is illuminated out of the area of the data CGH 101 by shifting in the direction, and the marker pattern 114 displayed on the display window 55 indicates that the data CGH 101 exists in the −X direction indicated by the arrow. . This is because the optical reader is shifted in the X direction,
When the optical reader is moved in the −X direction indicated by the marker pattern 114, the monochromatic light 6
One spot is irradiated, and the pattern of the data CGH 101 is reproduced and displayed on the display window 55. As shown in FIG. 3, the data CGH
When the markers CGH 102 are arranged on the same circumference around 101, the spot of the monochromatic light 61 from the light emitting unit 52
When any one of the markers CGH 102 is irradiated, a marker pattern (not shown) directed to the center direction is displayed on the display window 55. Therefore, also in this case, if the optical reading device is moved in the direction indicated by the marker pattern, a monochromatic light spot is irradiated on the area of the data CGH 101, and the pattern of the data CGH 101 is reproduced and displayed on the display window 55. As described above, the marker CGH 102
Is provided around the data CGH 101, information on the direction in which the optical reading device should be moved can be obtained, so that the data CGH 101 can be easily displayed without using a special mechanism such as a mooring unit or a positioning unit. Become. In the optical recording medium 1 described above, the optical reading device and the surface of the information recording section 10A or 10B attached or molded on the optical recording medium 1 are in a state where they are parallel to each other. Are parallel to each other, but the information recording unit 10A or 10B
In some cases, the surface of the CGH and the optical reader are inclined with respect to each other. FIG. 8 is a plan view showing the configuration of the information recording unit of the third embodiment of the optical recording medium for coping with the case where the surface of the CGH of the information recording unit and the bottom surface of the optical reader are inclined with respect to each other. is there. Information recording unit 1 in this embodiment
In 0C, data CGH101 and markers CGH103 are alternately arranged in the vertical direction and the horizontal direction among the square-shaped small sections obtained by dividing the square CGH forming area into the same number in the vertical direction and the horizontal direction. As a result, in the data CGH101 arranged at the corner of the information recording unit 10C, the markers CGH103 are adjacent in two vertical and horizontal directions, and in the data CGH101 arranged on each side, the markers CGH103 are arranged in a total of three vertical and horizontal directions. Are adjacent to each other, and in the data CGH arranged inside these, the markers CGH are adjacent in a total of four directions, vertical and horizontal. FIG. 9 shows a case where the spot of the monochromatic light 61 emitted from the light emitting unit is also applied to the marker CGH103 around the data CGH101 arranged inside the edge of the square information recording unit 10C. 7 shows an example of image information displayed on the display window 55. Here, a marker pattern 115 having substantially triangular vertices directed in the direction in which the data pattern 111 exists is arranged around the data pattern “A”, and the bases are arranged on quadrants forming one circle. Have been. In this case, the spot diameter of the monochromatic light 61 is determined by the data CGH101 and the marker CGH103.
However, the display window is formed smaller than the spread area of the diffracted light. Therefore, as is apparent from FIG.
When 11 is displayed in the center of the display window, the marker pattern 115 is located outside the display window 55 and is not displayed. FIG. 9 shows a case where the optical recording medium 1 shown in FIG. 8 is inserted at a normal angle with respect to the optical reading device. On the other hand, FIG. 10 is a diagram showing a state in which the optically recorded information reading apparatus is inclined by an angle θ with respect to the CGH of the information recording section. In this case, data pattern 1
11 moves out of the display window 55 and is not displayed, but since the marker pattern is displayed, it can be seen that the tilt of the optical reading device should be returned to either. FIG. 11 is a plan view showing a configuration of an information recording section of an optical recording medium according to a fourth embodiment of the present invention. The information recording unit 10D shown here is a marker CGH102 indicating that the optical reading device has shifted in the two-dimensional XY direction.
And a marker CGH10 indicating that the surface of the CGH of the information recording unit 10D and the optical reader are displaced in the inclined θ direction.
3 is combined. That is, a marker CGH102 on which a marker pointing in the center direction of the information recording unit is recorded is disposed in each of the divided areas on the periphery of the information recording unit, and data CGH101 on which data is recorded is disposed inside the marker CGH102. , This data CGH
Markers CGH103 in which markers pointing in the direction of existence of 101 are recorded on a quadrant that forms one circle with the other are alternately arranged in each sectioned area. With this configuration, it is possible to simultaneously correct the deviation and inclination of the optical recording information reading device and the optical recording medium having the information recording section in the planar direction, and thus the recording medium is a legitimate recording medium. Easy to determine whether
And it can be performed quickly. FIG. 12 is a plan view showing the configuration of an information recording section 10E of an optical recording medium according to a fifth embodiment of the present invention. This corresponds to the data CG in the embodiment shown in FIG.
Data CGH in which data is recorded only in the area of H101
101 and markers CGH103 in which markers pointing in the direction of existence of the data CGH101 are recorded on a quadrant that forms one circle with the other are alternately arranged in each divided area. Also in this embodiment, as described above,
It is possible to easily and quickly determine whether or not the medium is a valid recording medium. As is apparent from the above description, according to the present invention, the optical recording which enables the positioning of the information recording section without using a special mechanism such as a mooring section or a positioning section. A medium and an optical information reading device can be provided. Further, according to another aspect of the present invention, it is possible to provide an optical recording medium and an optical information reading apparatus which can correct the inclination between the optical recording information reading mechanism and the optical recording medium. Further, according to another invention, it is possible to provide an optical recording medium that requires only an inexpensive optical recording information reading device for reading an optical recording medium to which CGH is applied.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a configuration of a first embodiment of an optical recording information reading apparatus according to the present invention, together with an optical recording medium from which information is to be read. FIG. 2 is a plan view illustrating a configuration of an information recording unit of the first embodiment of the optical recording medium according to the present invention. FIG. 3 is a plan view showing a configuration of an information recording unit of a second embodiment of the optical recording medium according to the present invention. 4 is a display example of a data pattern for explaining an operation when the optical recording medium shown in FIG. 2 is visually recognized by the optical reading device shown in FIG. 1; FIG. 5 is a display example of a data pattern for explaining an operation when the optical recording medium shown in FIG. 2 is visually recognized by the optical reading device shown in FIG. 1; FIG. 6 is a display example of a data pattern for explaining an operation when the optical recording medium shown in FIG. 2 is visually recognized by the optical reading device shown in FIG. 1; FIG. 7 is a display example of a data pattern for explaining an operation when the optical recording medium shown in FIG. 2 is visually recognized by the optical reading device shown in FIG. 1; FIG. 8 is a plan view illustrating a configuration of an information recording unit of a third embodiment of the optical recording medium according to the present invention. FIG. 9 is a display example of a data pattern for explaining an operation when the optical recording medium shown in FIG. 8 is visually recognized by the optical reading device shown in FIG. 1; FIG. 10 is a display example of a data pattern for explaining an operation when the optical recording medium shown in FIG. 8 is visually recognized by the optical reading device shown in FIG. 1; FIG. 11 is a plan view showing a configuration of an information recording section of an optical recording medium according to a fourth embodiment of the present invention. FIG. 12 is a plan view showing a configuration of an information recording section of an optical recording medium according to a fifth embodiment of the present invention. FIG. 13 is a plan view showing a CGH arrangement example of an information recording section of a conventional optical recording medium. FIG. 14 is a cross-sectional view illustrating a configuration of a conventional optical reading device. FIG. 15 is a cross-sectional view illustrating a configuration of another conventional optical reading apparatus. [Description of Signs] 1 Optical recording medium 10, 10A, 10B, 10C, 10D, 10E Information recording unit 50 Optical reading device 50 52 Light emitting unit (light emitting means) 54 Opening 55 Display window 61 Monochromatic light 62 Diffracted light 101 Data CGH 102 Marker CGH (XY direction) 103 Marker CGH (θ direction) 111 Data pattern 112, 113, 114, 115 Marker pattern

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) G06K 19/06 G06K 19/00 DF Term (Reference) 2K008 AA04 AA13 CC03 FF07 FF27 HH19 5B035 AA15 BB05 BC00 5B058 CA33 KA06 KA27 KA31 YA02 YA03 5B072 AA02 CC02 CC35 DD02 GG07 KK03 LL12

Claims (1)

  1. Claims: 1. An optical information reading apparatus for reading information from an optical recording medium having an information recording section capable of reading information from diffracted light obtained by irradiating the monochromatic light, comprising: A light emitting unit that irradiates the information recording unit of the optical recording medium, a display window that displays reproduction information of diffracted light that is irradiated by monochromatic light and irradiates the information recording unit, and is diffracted by the information recording unit. An optical system that guides diffracted light to form an image on the display window, and based on the reproduction information displayed on the display window, at least one of a relative position and an inclination of the optical recording medium with respect to an information recording unit. An optical information reading device characterized in that one of them can be adjusted from outside. 2. An optical recording medium having an information recording portion on which information is recorded by CGH, wherein a movement of an information reproducing position is guided to a peripheral portion of the information recording portion in a direction toward a center of the information recording portion. An optical recording medium comprising a marker CGH on which a marker is recorded.
JP2001362374A 2001-11-28 2001-11-28 Optical information reader and optical recording medium Withdrawn JP2003162207A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005267552A (en) * 2004-03-22 2005-09-29 Fuji Xerox Co Ltd Optical information reading device
WO2009011286A1 (en) * 2007-07-13 2009-01-22 International Business Machines Corporation Apparatus to easily photograph invisible image inherent on subject with the image observed and method of making use of same
US8259342B2 (en) 2005-07-04 2012-09-04 International Business Machines Corporation System, method and program for generating data for printing invisible information, and method of manufacturing physical medium whereupon invisible information is printed

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005267552A (en) * 2004-03-22 2005-09-29 Fuji Xerox Co Ltd Optical information reading device
US7599514B2 (en) 2004-03-22 2009-10-06 Fuji Xerox Co., Ltd. Optical information reading device
JP4529503B2 (en) * 2004-03-22 2010-08-25 富士ゼロックス株式会社 Optical information reader
US8259342B2 (en) 2005-07-04 2012-09-04 International Business Machines Corporation System, method and program for generating data for printing invisible information, and method of manufacturing physical medium whereupon invisible information is printed
US9001389B2 (en) 2005-07-04 2015-04-07 International Business Machines Corporation Manufacturing a physical medium configured to store data
US9454722B2 (en) 2005-07-04 2016-09-27 International Business Machines Corporation Manufacturing a physical medium configured to store data
US8659787B2 (en) 2005-07-04 2014-02-25 International Business Machines Corporation Manufacturing a physical medium configured to store data and obtaining additional information associated with an article in a book
US9230201B2 (en) 2005-07-04 2016-01-05 International Business Machines Corporation Computer system for manufacturing a physical medium configured to store data
JP4870815B2 (en) * 2007-07-13 2012-02-08 インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation Apparatus for easily photographing while observing an invisible image existing on a subject, and method of using the same
WO2009011286A1 (en) * 2007-07-13 2009-01-22 International Business Machines Corporation Apparatus to easily photograph invisible image inherent on subject with the image observed and method of making use of same
CN101772773A (en) * 2007-07-13 2010-07-07 国际商业机器公司 Apparatus to easily photograph invisible image inherent on subject with the image observed and method of making use of same
KR101091327B1 (en) * 2007-07-13 2011-12-07 인터내셔널 비지네스 머신즈 코포레이션 Apparatus to easily photograph invisible image inherent on subject with the image observed and method of making use of same

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