Invention Application
US20050024746A1 Fresnel lens and an illuminating device provided with the fresnel lens
有权
菲涅尔透镜和设有菲涅尔透镜的照明装置
- Patent Title: Fresnel lens and an illuminating device provided with the fresnel lens
- Patent Title (中): 菲涅尔透镜和设有菲涅尔透镜的照明装置
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Application No.: US10900313Application Date: 2004-07-28
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Publication No.: US20050024746A1Publication Date: 2005-02-03
- Inventor: Takashi Shimura
- Applicant: Takashi Shimura
- Assignee: CITIZEN ELECTRONICS CO., LTD.
- Current Assignee: CITIZEN ELECTRONICS CO., LTD.
- Priority: JP2003-202748 20030729
- Main IPC: F21S2/00
- IPC: F21S2/00 ; F21V5/04 ; F21V7/04 ; F21Y101/02 ; G02B3/08 ; G02B27/00
Abstract:
A refractive Fresnel lens part is provided on an upper surface of a plate-like lens at a central portion. A reflective Fresnel lens part is provided on a lower surface of the plate-like lens at a peripheral portion.
Public/Granted literature
- US07251084B2 Fresnel lens and an illuminating device provided with the Fresnel lens Public/Granted day:2007-07-31
Information query
