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Title:
LENS MEMBER AND LIGHT-EMITTING DEVICE USING SAME
Document Type and Number:
WIPO Patent Application WO/2013/024836
Kind Code:
A1
Abstract:
[Problem] To provide a lens member and light-emitting device having high light-collecting ability, and which enable further reduction in thickness. [Solution] A lens member having a light incidence surface (10a), a light emission surface (10b) on the opposite side from the light incidence surface (10a), a Fresnel lens (14) disposed on the central axis (AX) through the center of the light incidence surface (10a), and a diffraction grating structure (15) disposed outside the Fresnel lens (14) and centered around the central axis (AX), the Fresnel lens (14) being provided with a first Fresnel lens (14a) having a plurality of annular prisms which are divided from a convex lens and disposed so as to be centered around the central axis (AX) of the light incidence surface (10a), and a second Fresnel lens (14b) having a plurality of annular prisms which are divided from a TIR lens and disposed outside the first Fresnel lens (14a) so as to be centered around the central axis (AX) of the light incidence surface (10a).

Inventors:
MIYASHITA, Junji (1-23-1, Kamikurechi, Fujiyoshida-sh, Yamanashi 01, 〒4030001, JP)
宮下純司 (〒01 山梨県富士吉田市上暮地1丁目23番1号 シチズン電子株式会社内 Yamanashi, 〒4030001, JP)
KAYANUMA, Yasuaki (1-23-1, Kamikurechi, Fujiyoshida-sh, Yamanashi 01, 〒4030001, JP)
Application Number:
JP2012/070601
Publication Date:
February 21, 2013
Filing Date:
August 13, 2012
Export Citation:
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Assignee:
CITIZEN ELECTRONICS CO., LTD. (1-23-1, Kamikurechi Fujiyoshida-sh, Yamanashi 01, 〒4030001, JP)
シチズン電子株式会社 (〒01 山梨県富士吉田市上暮地1丁目23番1号 Yamanashi, 〒4030001, JP)
CITIZEN HOLDINGS CO., LTD. (6-1-12, Tanashi-cho 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)
MIYASHITA, Junji (1-23-1, Kamikurechi, Fujiyoshida-sh, Yamanashi 01, 〒4030001, JP)
International Classes:
G02B3/08; F21V5/00; F21V5/04; G02B5/18; G02B17/08; F21Y101/02
Domestic Patent References:
WO2004102232A12004-11-25
Foreign References:
JPH01282501A1989-11-14
JP2008209811A2008-09-11
JP2002352611A2002-12-06
JPS6437541A1989-02-08
JP2007011216A2007-01-18
JP2005292666A2005-10-20
JPS5755002A1982-04-01
JPS59119340A1984-07-10
JPH05281402A1993-10-29
JP2010262187A2010-11-18
JP2011141450A2011-07-21
Other References:
See also references of EP 2743740A4
Attorney, Agent or Firm:
ASAKAWA, Tetsu (1168-1, Shimizuarai Showa-cho, Nakakoma-gu, Yamanashi 67, 〒4093867, JP)
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Claims: