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Development and Installation of Thin-Film “Photovoltaic Cell (PV) Signs”


April 21, 2010Takenaka CorporationMitsubishi Chemical Corration

Takenaka Corporation (Head Office: Chuo-ku, Osaka; President: Toichi Takenaka; hereafter “Takenaka”) and Mitsubishi Chemical Corporation (Head Office: Minato-ku, Tokyo; President: Yoshimitsu Kobayashi; hereafter “Mitsubishi Chemical”) have jointly developed thin-film “Photovoltaic Cell (PV) Signs,” next-generation commercial advertising display signs. The first sign has already been installed at the “Kansai Coke and Chemicals Co., Ltd. Ohama Consolidated Building Reconstruction Work” in Amagasaki in Hyogo Prefecture, which is scheduled to be completed on April 22.

Because the Ohama Consolidated Building is being reconstructed in an area with many state-of-the-art high-tech plants, the local authorities, in this case Amagasaki City, also called for special consideration of the environment.
Takenaka and Mitsubishi Chemical began development of this new, ecofriendly method for display signs as part of the company’s efforts to meet these requirements.

  • (At night, LEDs light up.)

  • (During the day, the thin-film PV cells charge and store electricity.)

【Features of the PV Signs】

  • Thin-film PV (amorphous silicon-type) cells are installed inside the pillow-shaped sign, which is made of a type of polymer film (ETFE: ethylene tetrafluoroethylene). The cells charge and store electricity, and at night, the LEDs light up the sign.
  • Making the most of the features of thin-film PV cells, such as being thin, light and soft, they have been made into one unit with the sign (superimposed), which is made of a type of polymer film. Therefore, there is no need for any additional space for the PV cells.
  • Because the sign is composed of lightweight and highly-durable materials, it is easy to maintain.
  • This is the first time a display sign has been produced in Japan through the combination of thin-film PV cells and LEDs.

Takenaka and Mitsubishi Chemical will continue to develop ecofriendly technologies in the future to contribute to society.

【Outline of “Kansai Coke and Chemicals Co., Ltd. Ohama Consolidated Building”】

Client: Kansai Coke and Chemicals Co., Ltd.
Building use: Laboratory and offices
Location: 2-23 Ohama-cho, Amagasaki City, Hyogo Prefecture
Site area: 127,030m²
Building Area: 2,229m²
Total floor space: 5,542m²
Structure/Number of floors: Steel, 3 fl. aboveground
Work period: November 2009 to April 2010

【Contacts for Further Enquiries】

広報室 Public Relations Department
Takenaka Corporation
Tel: 06-6263-5605

広報室 Public Relations Department
Mitsubishi Chemical Corporation
Tel: 03-6414-3730