Title:
FRESNEL LENS AND MANUFACTURING METHOD THEREOF
Document Type and Number:
Japanese Patent JP2016176981
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a Fresnel lens capable of suppressing generation of stray light and a manufacturing method thereof.SOLUTION: A Fresnel lens 1 has a first lens part 10, a second lens part 20 and a shading part 30. The second lens part 20 is located adjacent to the first lens part 10. The second lens part 20 has a plurality of Fresnel surface 20a and rise faces 20b each of which is provided between the plurality of Fresnel surface 20a adjacent to each other. The shading part 30 is arranged at the second lens part 20. The shading part 30 has a first shading portion and a second shading portion. The first shading portion is provided at a rise face 20b. The second shading portion is provided near the crossing section of the rise face 20b with a first Fresnel surface 20a on the first Fresnel surface 20a located at the side of the first lens part from the rise face 20b.SELECTED DRAWING: Figure 1
Inventors:
SAKAI TETSUO
Application Number:
JP2015054871A
Publication Date:
October 06, 2016
Filing Date:
March 18, 2015
Export Citation:
Assignee:
TOSHIBA CORP
International Classes:
G02B3/08; B29D11/00; G02B5/00
Domestic Patent References:
| JPH0943405A | 1997-02-14 | |||
| JP2005081420A | 2005-03-31 | |||
| JP2014003302A | 2014-01-09 |
Foreign References:
| WO1997001115A1 | 1997-01-09 |
Attorney, Agent or Firm:
Masahiko Hinataji
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