Regular paper

[OPTICAL REVIEW Vol. 15, No. 1 (2008) 44-50]
© 2008 The Optical Society of Japan

The Formation of Large Scale Reconstructed Images through the Use of Holograms

Takashi TSUCHITANI, Sumio NAKAHARA1,4*, Hisaharu TOTTORI2, Kazuhito KANAZAWA3, and Takeyoshi FUJITA4

Opticom Research, Ltd., 1-20-25 Hirano, Kawanishi, Hyogo 666-0121, Japan
1High-technology Research Center, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan
2Former Hanshin Expressway Company, Ltd., 4-1-3 Kyutaro-cho, Chuo-ku, Osaka 541-0056, Japan
3Hanshin Expressway Company, Ltd., 4-1-3 Kyutaro-cho, Chuo-ku, Osaka 541-0056, Japan
4Department of Mechanical Systems Engineering, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan

(Received April 19, 2007; Accepted October 25, 2007)

We propose and demonstrate a method which constructs large size multicolor images using a holographic technique in limited spaces, i.e., tunnels. A traffic sign image of the same size and color as an actual traffic sign board is displayed using many comparative small holograms. Each hologram is composed of a single computer generated hologram (CGH). Though it was necessary to make many CGHs, we have shortened the hologram production time by putting a reconstructed image on long distance, and using many reconstruction sources. Moreover, though cross-talk images are caused in a color reconstruction, by adjusting the optical system it is possible to make sure that drivers see only the appropriate image. Many holograms function as one big hologram, and it has been confirmed that a large reconstructed image can be displayed in a limited space.

Key words: traffic sign, hologram, CGH, cross-talk, Fresnel, Huygens–Fresnel


*E-mail address: nakahara@ipcku.kansai-u.ac.jp

 

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