Title:
Lighting equipment, projection equipment, lens arrays and optics
Document Type and Number:
Japanese Patent JP6327035
Kind Code:
B2
Abstract:
An illumination device has a plurality of first lens elements to collect incident light beams, and a field lens to guide each of the light beams that have passed through the plurality of first lens elements to an entire region of a specific area. The plurality of first lens elements include at least two first lens elements having different lens diameters from each other. When one of the two first lens elements has a lens diameter d and a focal length f, another of the two first lens elements has a lens diameter k×d (where k is a value larger than zero but other than 1) and a focal length k×f.
Inventors:
Kurashige Makio
Application Number:
JP2014149194A
Publication Date:
May 23, 2018
Filing Date:
July 22, 2014
Export Citation:
Assignee:
Dai Nippon Printing Co.,Ltd.
International Classes:
F21V13/02; F21S2/00; F21V5/04; G02B3/00; G02B3/06; G02B19/00; G03B21/14; H04N5/74
Domestic Patent References:
| JP2005352392A | ||||
| JP2009186923A | ||||
| JP2002090884A | ||||
| JP2000155201A | ||||
| JP2009518812A | ||||
| JP2005352205A | ||||
| JP2012048832A |
Foreign References:
| CN101788712A |
Attorney, Agent or Firm:
Hiroyuki Nagai
Hirohito Katsunuma
Yukihiro Hotta
Yasushi Kawasaki
Hirohito Katsunuma
Yukihiro Hotta
Yasushi Kawasaki