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1. WO2020109652 - AN OPTICAL DEVICE FOR MODIFYING LIGHT DISTRIBUTION

Publication Number WO/2020/109652
Publication Date 04.06.2020
International Application No. PCT/FI2019/050762
International Filing Date 24.10.2019
IPC
G02B 5/30 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
30Polarising elements
G02B 19/00 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
19Condensers
G02B 27/09 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
27Optical systems or apparatus not provided for by any of the groups G02B1/-G02B26/119
09Beam shaping, e.g. changing the cross-sectioned area, not otherwise provided for
CPC
G02B 19/0028
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
19Condensers, ; e.g. light collectors or similar non-imaging optics
0004characterised by the optical means employed
0028refractive and reflective surfaces, e.g. non-imaging catadioptric systems
G02B 19/0061
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
19Condensers, ; e.g. light collectors or similar non-imaging optics
0033characterised by the use
0047for use with a light source
0061the light source comprising a LED
G02B 27/0927
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
27Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
09Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
0927Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
G02B 5/3066
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
30Polarising elements
3025Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
3066involving the reflection of light at a particular angle of incidence, e.g. Brewster's angle
Applicants
  • LEDIL OY [FI]/[FI]
Inventors
  • MATIKAINEN, Yrjö-Sakari
Agents
  • FINNPATENT OY
Priority Data
2018600829.11.2018FI
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) AN OPTICAL DEVICE FOR MODIFYING LIGHT DISTRIBUTION
(FR) DISPOSITIF OPTIQUE POUR MODIFIER LA RÉPARTITION LUMINEUSE
Abstract
(EN)
An optical device (201) comprises a reflector-section (208) that comprises a light- ingress surface (203) for receiving light from a light source(202), a reflector surface (204) for reflecting the light based on total internal reflection, and a light-egress surface (205) through which the reflected light exits the optical device. When the light source is at a predetermined position with respect to the optical device, an angle of incidence (θi) of the light at the light-egress surface is a polarization angle at which a p-polarized component of the light is transmitted through the light-egress surface without being reflected by the light-egress surface. Thus, unwanted reflections at the light-egress surface can be reduced and thereby unwanted scattering of light is reduced while having good transmitting efficacy.
(FR)
L'invention concerne un dispositif optique (201) comprenant une section de réflecteur (208) qui comprend une surface d'entrée de lumière (203) pour recevoir de la lumière provenant d'une source de lumière (202), une surface de réflecteur (204) pour réfléchir la lumière sur la base de la réflexion interne totale, et une surface de sortie de lumière (205) à travers laquelle la lumière réfléchie sort du dispositif optique. Lorsque la source de lumière est à une position prédéterminée par rapport au dispositif optique, un angle d'incidence (θi) de la lumière au niveau de la surface de sortie de lumière est un angle de polarisation au niveau duquel une composante polarisée p de la lumière est transmise à travers la surface de sortie de lumière sans être réfléchie par la surface de sortie de lumière. Ainsi, des réflexions indésirables au niveau de la surface de sortie de lumière peuvent être réduites et, de ce fait, la diffusion indésirable de la lumière est réduite tout en ayant une bonne efficacité de transmission.
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