Title:
レンズ及びそれを備えた照明装置
Document Type and Number:
Japanese Patent JP6886340
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a lens that a balance of the light distribution is not largely off balance even when a position deviation occurs in a lens adjusting a light distribution, and to provide an illumination device that is equipped with the lens.SOLUTION: An annular lens 10 included in an LED bulb 40 comprises a lower part incidence surface 11 that becomes a convexity surface toward a lower part in a part of an undersurface. An upper part reflection surface 12 and an outer periphery side emission surface 13 are provided above the lower part incidence surface 11 and on an outer peripheral side. On an inner peripheral side from the lower part incidence surface 11, an inner peripheral side incidence surface 14 and an inner peripheral side reflection surface 16 are provided. Further, inner peripheral side emission 15 covers the inner peripheral side incidence surface 14 and the inner peripheral side reflection surface 16. In the LED bulb 40, one LED 21 and other LED 21 pairing in a circular array are configured to compensate for an amount of change in radiation light with respect to a position deviation of the lens 10.SELECTED DRAWING: Figure 2
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Inventors:
Kainuma Yasuaki
Application Number:
JP2017092888A
Publication Date:
June 16, 2021
Filing Date:
May 09, 2017
Export Citation:
Assignee:
CITIZEN WATCH CO.,LTD.
Citizen Electronics Co., Ltd.
Citizen Electronics Co., Ltd.
International Classes:
G02B17/08; F21K9/232; F21K9/69; F21V5/00; G02B3/00
Domestic Patent References:
| JP2013143234A | ||||
| JP2013038031A | ||||
| JP2012252994A | ||||
| JP2015002018A |
Foreign References:
| US20160298826 |
Attorney, Agent or Firm:
Satoshi Asakawa
Masaki Shimura
Masaki Shimura