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Patent Searching and Data


Title:
LIGHT QUANTITY CONTROL DEVICE AND CAMERA DEVICE
Document Type and Number:
WIPO Patent Application WO/2005/040898
Kind Code:
A1
Abstract:
A change in tint caused by the control of the light transmittance of a physical property element is limited by a simple structure. An optical element (1) for limiting a light with at least a specified wavelength is provided to a physical element (20) such as liquid crystal capable of controlling a light transmittance. The optical element (1) limits a light on the longer wavelength side of a wavelength corresponding to a wavelength migrating from a weak-wavelength-dependent wavelength region to a strong-wavelength-dependent wavelength region in the spectral characteristics of the physical element (20). Lights from a subject have a light with at least a specified wavelength limited at the optical element (1), and have light transmittance controlled at the physical element (20) to enter an imaging element (3). Owing to the optical element (1), a light in a wavelength region where the spectral characteristics of the physical element (20) are stable is selectively allowed to enter the imaging element (3), thereby keeping nearly constant a color balance even if the light transmittance of the physical element (20) is changed.

Inventors:
Sato, Yutaka c/o Sony Corporation (7-35 Kitashinagawa 6-chom, Shinagawa-ku Tokyo, 141-0001, JP)
Tabei, Hiroyuki c/o Sony Corporation (7-35 Kitashinagawa 6-chom, Shinagawa-ku Tokyo, 141-0001, JP)
Nakayama, Nobutaka c/o Sony LSI Design Inc. (134 Goudo-cho Hodogaya-k, Yokohama-shi Kanagawa, 240-0005, JP)
Application Number:
PCT/JP2004/015197
Publication Date:
May 06, 2005
Filing Date:
October 07, 2004
Export Citation:
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Assignee:
SONY CORPORATION (7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
Sato, Yutaka c/o Sony Corporation (7-35 Kitashinagawa 6-chom, Shinagawa-ku Tokyo, 141-0001, JP)
Tabei, Hiroyuki c/o Sony Corporation (7-35 Kitashinagawa 6-chom, Shinagawa-ku Tokyo, 141-0001, JP)
Nakayama, Nobutaka c/o Sony LSI Design Inc. (134 Goudo-cho Hodogaya-k, Yokohama-shi Kanagawa, 240-0005, JP)
International Classes:
G03B7/18; G02B5/00; G02B5/22; G02F1/01; G03B9/02; G03B11/00; H04N5/238; (IPC1-7): G02F1/01; G03B9/02; G03B11/00
Foreign References:
JP2003131189A
JPH0654253A
Attorney, Agent or Firm:
Sugiura, Masatomo (7th Floor, Ikebukuro Park Bldg. 49-7, Minami Ikebukuro 2-chom, Toshima-ku Tokyo, 171-0022, JP)
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