Title:
POLARIZATION CONVERSION ELEMENT
Document Type and Number:
WIPO Patent Application WO/2011/105619
Kind Code:
A1
Abstract:
Provided is a polarization conversion element capable of converting to radially polarized light linearly polarized light having a wavelength within a prescribed wavelength region. The polarization conversion element (1) has a phase reversal element (2) and a polarization plane rotation element (3). The polarization plane rotation element (3) has a liquid crystal layer (30), and two transparent electrodes (33, 34). The liquid crystal layer (30) has a plurality of areas (30a - 30h), with mutually different orientation directions, are arranged along a circumferential direction centered around the intersection point of the polarization plane rotation element (3) and the optical axis (OA). When a voltage corresponding to the wavelength of the linearly polarized light irradiated onto the polarization conversion element (1) is applied between the two transparent electrodes (33, 34), each area causes the polarization plane of the polarization component which was transmitted through each area to rotate so as to be in parallel with an emission direction centered at the intersection point with the optical axis, and the linearly polarized light is converted to radially polarized light thereby. Of a first and a second annular part arranged one after the other along an emission direction centered at the optical axis (OA), the phase reversal element (2) causes the phase of light irradiated onto the first annular part to be reversed with respect to the phase of the light irradiated onto the second annular part. The polarization conversion element can be used, for example, in light pickup devices, in laser equipment, and in laser microscopes.
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Inventors:
HASHIMOTO, Nobuyuki (1-12, Tanashicho 6-chome, Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
橋本 信幸 (〒11 東京都西東京市田無町六丁目１番１２号シチズンホールディングス株式会社内 Tokyo, 〒1888511, JP)
KURIHARA, Makoto (6663-2, Funatsu, Fujikawaguchiko-machi, Minamitsuru-gu, Yamanashi 95, 〒4010395, JP)
栗原 誠 (〒95 山梨県南都留郡富士河口湖町船津６６６３番地の２シチズンセイミツ株式会社内 Yamanashi, 〒4010395, JP)
MATSUMOTO, Kenji (1-12, Tanashicho 6-chome, Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
橋本 信幸 (〒11 東京都西東京市田無町六丁目１番１２号シチズンホールディングス株式会社内 Tokyo, 〒1888511, JP)
KURIHARA, Makoto (6663-2, Funatsu, Fujikawaguchiko-machi, Minamitsuru-gu, Yamanashi 95, 〒4010395, JP)
栗原 誠 (〒95 山梨県南都留郡富士河口湖町船津６６６３番地の２シチズンセイミツ株式会社内 Yamanashi, 〒4010395, JP)
MATSUMOTO, Kenji (1-12, Tanashicho 6-chome, Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
Application Number:
JP2011/054820
Publication Date:
September 01, 2011
Filing Date:
February 24, 2011
Export Citation:
Assignee:
CITIZEN HOLDINGS CO., LTD. (1-12, Tanashicho 6-chome Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
シチズンホールディングス株式会社 (〒11 東京都西東京市田無町六丁目１番１２号 Tokyo, 〒1888511, JP)
HASHIMOTO, Nobuyuki (1-12, Tanashicho 6-chome, Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
橋本 信幸 (〒11 東京都西東京市田無町六丁目１番１２号シチズンホールディングス株式会社内 Tokyo, 〒1888511, JP)
KURIHARA, Makoto (6663-2, Funatsu, Fujikawaguchiko-machi, Minamitsuru-gu, Yamanashi 95, 〒4010395, JP)
栗原 誠 (〒95 山梨県南都留郡富士河口湖町船津６６６３番地の２シチズンセイミツ株式会社内 Yamanashi, 〒4010395, JP)
シチズンホールディングス株式会社 (〒11 東京都西東京市田無町六丁目１番１２号 Tokyo, 〒1888511, JP)
HASHIMOTO, Nobuyuki (1-12, Tanashicho 6-chome, Nishitokyo-sh, Tokyo 11, 〒1888511, JP)
橋本 信幸 (〒11 東京都西東京市田無町六丁目１番１２号シチズンホールディングス株式会社内 Tokyo, 〒1888511, JP)
KURIHARA, Makoto (6663-2, Funatsu, Fujikawaguchiko-machi, Minamitsuru-gu, Yamanashi 95, 〒4010395, JP)
栗原 誠 (〒95 山梨県南都留郡富士河口湖町船津６６６３番地の２シチズンセイミツ株式会社内 Yamanashi, 〒4010395, JP)
International Classes:
G02F1/13; G02B5/30; G02F1/1335; G11B7/135
Attorney, Agent or Firm:
AOKI, Atsushi et al. (SEIWA PATENT & LAW, Toranomon 37 Mori Bldg.,,5-1, Toranomon 3-chome, Minato-ku, Tokyo 23, 〒1058423, JP)
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Claims: