| US 7,385,740 B2 | ||
| Hologram recording medium | ||
| Koichi Haga, Ashigarakami-gun (Japan); Kazuhiro Hayashi, Ashigarakami-gun (Japan); Katsunori Kawano, Ashigarakami-gun (Japan); Hisae Yoshizawa, Ashigarakami-gun (Japan); Jiro Minabe, Ashigarakami-gun (Japan); Yasuhiro Ogasawara, Ashigarakami-gun (Japan); Shin Yasuda, Ashigarakami-gun (Japan); and Norie Matsui, Ashigarakami-gun (Japan) | ||
| Assigned to Fuji Xerox Co., Ltd., Tokyo (Japan) | ||
| Filed on Aug. 17, 2005, as Appl. No. 11/204,990. | ||
| Claims priority of application No. 2005-092627 (JP), filed on Mar. 28, 2005. | ||
| Prior Publication US 2006/0215243 A1, Sep. 28, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G03H 1/02 (2006.01); G03H 1/04 (2006.01); G11B 7/24 (2006.01) | ||
| U.S. Cl. 359—3 [430/1; 369/275.5] | 18 Claims |
| 1. A hologram recording medium comprising:
a non-optical-quality sheet member;
a recording layer at which a hologram can be recorded by illumination of writing light;
a reflecting layer provided between the sheet member and the recording layer, and due to illumination of reading light from
a recording layer side, the reflecting layer reflecting the reading light and diffracted light diffracted by the hologram;
and
a protective layer provided on the recording layer in order to protect the recording layer, a water absorbency of the protective
layer being less than or equal to 0.001%, wherein a ten-point average roughness of a surface of the reflecting layer which
surface contacts the recording layer is less than a wavelength of the reading light.
|