Dai Nippon Printing Co., Ltd.

Masato Taninaka

Mitsuru Kitamura

Hidekazu Okuno

Masayo Shima

Two original images to be recorded are prepared as data (S). 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 (S). 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 (S). 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 (S), and a record pattern is formed on a physical medium (S).

Method for preparing a hologram recording medium

Two adjacent images are recorded in a state smoothly blended at a boundary portion. On a recording plane Rec, provided is a region Min which an original image Pic(A) is recorded, a region Min which an original image Pic(B) is recorded, and a middle region Mm positioned therebetween. The region Mm is divided into a plurality of strip-like regions fto f. The widths of the strip-like regions f, f, and fthat are odd-numbered when counted from the region Mare set so as to increase monotonically in this order, while the widths of the even-numbered strip-like regions f, f, and fare set so as to decrease monotonically in this order.

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Tokyo, Japan

Masato Taninaka