Method for preparing a hologram recording medium

a technology of hologram and recording medium, which is applied in the field of hologram recording medium preparation, can solve the problems of lack of design quality of hologram and inability to adjust the method according to the observation direction, and achieve the effect of good blending
US20070216978A1Inactive Publication Date: 2007-09-20DAI NIPPON PRINTING CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
DAI NIPPON PRINTING CO LTD
Publication Date
2007-09-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

Two original images to be recorded are prepared as data (S10). A plurality of unit regions, each having an adequate area to record interference fringes of visible light, are defined and positioned on a hologram recording surface (S20). A gradation pattern, with which appearance probabilities of two record attributes gradually change in space, is overlapped onto the recording surface, and to each unit region, one of either record attributes is assigned according to the appearance probabilities of the respective record attributes at each individual position (S30). In each unit region, to which the first record attribute is assigned, the first original image is recorded as an interference fringe pattern, a diffraction grating pattern, or a scattering structure pattern, and in each unit region, to which the second record attribute is assigned, the second original image is recorded as an interference fringe pattern, a diffraction grating pattern, or a scattering structure pattern (S40), and a record pattern is formed on a physical medium (S50).
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Description

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a method for preparing a hologram recording medium and particularly relates to a method for preparing a hologram recording medium, with which a gradated motif expression is enabled by computation using a computer.

[0002] Holograms are widely used in applications for preventing counterfeiting of cash vouchers and credit cards. Normally, a region onto which a hologram is to be recorded is set up in a portion of a medium to be subject to counterfeiting prevention, and a hologram of a three-dimensional image, etc., is recorded inside this region.

[0003] Although conventionally with many commercially utilized holograms, an original image is recorded onto a medium in the form of interference fringes by an optical method, methods for preparing a hologram by forming interference fringes on a recording surface by computation using a computer have come to be known recently. A hologram prepared by such a method is generally referred...

Claims

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