LUMINOUS FLUX CONTROL MEMBER, LIGHT EMITTING DEVICE, SURFACE LIGHT SOURCE DEVICE, AND DISPLAY DEVICE

• Main Authors: TAKATORI HIROSHI, MOMOI TAKURO
• Format: Patent
• Language: English; Japanese
• Published: 01.06.2022
• Subjects: BLASTING; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-LINEAR OPTICS; NON-PORTABLE LIGHTING DEVICES; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

To provide a luminous flux control member which can inhibit luminance unevenness even if a light emitting surface of a light emitting element is small.SOLUTION: In a light emitting device 120, a luminous flux control member has a first optical surface 161, a second optical surface 162, a third optical surface 163, and a fourth optical surface 164. Part of light emitted from a light emitting element 150 and entering into the first optical surface 161 is internally reflected by the second optical surface 162, the third optical surface 163, and the fourth optical surface 164 in sequence and then emitted from the second optical surface 162 to the outside of the luminous flux control member. Part of light emitted from the light emitting element 150 and entering into the first optical surface 161 causes fresnel reflection to be reflected on a surface of a substrate 140 toward the first optical surface 161, enter into the luminous flux control member on the first optical surface 161, and then be emitted from the second optical surface 162 to the outside of the luminous flux control member.SELECTED DRAWING: Figure 5 【課題】発光素子の発光面が小さい場合であっても輝度ムラを抑制できる光束制御部材を提供する。【解決手段】発光装置１２０において、光束制御部材は、第１光学面１６１と、第２光学面１６２と、第３光学面１６３と、第４光学面１６４とを有する。発光素子１５０から出射され、第１光学面１６１で入射した光のうち一部の光は、第２光学面１６２、第３光学面１６３および第４光学面１６４で順に内部反射された後、第２光学面１６２から光束制御部材の外部に出射される。発光素子１５０から出射され、第１光学面１６１に入射する光のうち一部の光は、フレネル反射し、基板１４０の表面で第１光学面１６１に向けて反射され、第１光学面１６１で光束制御部材の内部に入射した後、第２光学面１６２から光束制御部材の外部に出射される。【選択図】図５