Title:
STRAIGHT TUBE TYPE LED LAMP AND LUMINAIRE
Document Type and Number:
Japanese Patent JP2015133257
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a straight tube type LED lamp which can reduce uncomfortable glare by greatly reducing the Unified Glare Rating (UGR) without depending on a lighting fixture shape, and which can contribute to improvement of versatility.SOLUTION: An LED 12 mounted on an LED substrate 11 is covered by a lens part 50. A second lens 50d is formed which is located closer to a cover (observer side) than a first lens in a front direction of a first lens 50b and whose curvature radius is smaller than that of the first lens. The second lens 50d is configured by forming a hemispherical space 50c communicating with a space 50a inside the lens part 50. The centers of the first lens 50b and the second lens 50d are located on a normal line of the center of a light emitting surface of the LED 12. By the existence of the second lens 50d, an apparent area of the LED 12 can be reduced.
Inventors:
UCHIYAMA MASAHIRO
ONO NOBUAKI
ONO NOBUAKI
Application Number:
JP2014004480A
Publication Date:
July 23, 2015
Filing Date:
January 14, 2014
Export Citation:
Assignee:
RICOH CO LTD
International Classes:
F21V5/04; F21S2/00; F21V5/00; G02B3/00; G02B3/06; H01L33/00
Attorney, Agent or Firm:
Shuichi Kudo
Toru Kabayama
Shogo Honda
Toru Kabayama
Shogo Honda