Title:
LIGHT-EMITTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/047975
Kind Code:
A1
Abstract:
A light-emitting device has an LED, a first optical element placed so as to cover the LED, and a second optical element placed so as to cover the first optical element. The first optical element has: a first incident surface on which light emitted from the LED is made incident; a first reflecting surface having a recessed shape and placed above the first incident surface, the first reflecting surface fully reflecting to the side the light made incident via the first incident surface from the LED; and a first emitting surface placed across the periphery of the first reflecting surface, the first emitting surface emitting the light reflected by the first reflecting surface. The second optical element has: an incident-reflecting surface formed by, placed in concentric circle form, a plurality of second incident surfaces on which light emitted from the first emitting surface is made incident, and a plurality of second reflecting surfaces placed alternately with the plurality of second incident surfaces, that fully reflect upward the light made incident on the plurality of second incident surfaces; and a second emitting surface that is placed above the incident-reflecting surface, and that emits light reflected by the plurality of second light reflecting surfaces.
Inventors:
KATSUMATA TOSHINOBU (JP)
HORIUCHI TAKUMA (JP)
HORIUCHI TAKUMA (JP)
Application Number:
PCT/JP2017/032900
Publication Date:
March 15, 2018
Filing Date:
September 12, 2017
Export Citation:
Assignee:
CITIZEN WATCH CO LTD (JP)
CITIZEN ELECTRONICS (JP)
CITIZEN ELECTRONICS (JP)
International Classes:
F21S2/00; F21V5/00; G02F1/13357; F21Y115/10
Foreign References:
| JP2012004095A | 2012-01-05 | |||
| JP2010239021A | 2010-10-21 | |||
| JP2013012417A | 2013-01-17 | |||
| JP2004223638A | 2004-08-12 |
Other References:
See also references of EP 3511606A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
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