Title:
BULK LENS, LIGHT-EMITTING BODY, AND METHOD FOR DESIGNING BULK LENS
Document Type and Number:
WIPO Patent Application WO/2021/193758
Kind Code:
A1
Abstract:
This bulk lens 1e includes: an emission surface 36c formed by a curved surface having a continuous curvature; an optical transmission part; a rear outer wall surface 44e; and a recess part that is formed by a ceiling part 42e and a side wall 43e provided inside the optical transmission part and accommodates a planar light emitting element 91e. The curvature of a central region is set so that a difference between an emission angle of light emitted from a first emission point of a central region of the emission surface 36c through the center of the ceiling part 42e and an emission angle of light emitted from a second emission point of the central region through the ceiling part 42e adjacent to the side wall 43e falls within a first emission angle range. The curvature of a peripheral region and the curvature of the rear outer wall surface 44e are set so that the difference between an emission angle of light incident from the uppermost side of the side wall 43e, reflected by the rear outer wall surface 44e, and emitted from a third emission point of the peripheral region of the emission surface 36c and an emission angle of light incident from a position away from the ceiling part 42e of the side wall 43e, reflected by the rear outer wall surface 44e, and emitted from a fourth emission point of the peripheral region falls within a second emission angle range.
Inventors:
OTSUKA AKIRA (JP)
TAMAOKI SATOSHI (JP)
TAMAOKI SATOSHI (JP)
Application Number:
PCT/JP2021/012370
Publication Date:
September 30, 2021
Filing Date:
March 24, 2021
Export Citation:
Assignee:
LAB SPHERE CORP (JP)
International Classes:
F21V5/00; G02B3/04; G02B3/08; F21Y115/10
Foreign References:
| JP2018037404A | 2018-03-08 | |||
| JP2005093622A | 2005-04-07 |
Attorney, Agent or Firm:
AMBO Aiko (JP)
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