SURFACE LIGHT SOURCE DEVICE AND DISPLAY DEVICE

• Main Authors: SUGINO SHINYA, SAWANAKA TOMOHIKO
• Format: Patent
• Language: English; Japanese
• Published: 19.04.2018
• 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 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

PROBLEM TO BE SOLVED: To provide a surface light source device which can perform light distribution control in a longitudinal direction of a light distribution control element as well and has tolerance for thermal expansion or thermal contraction.SOLUTION: A surface light source device comprises: a substrate including a principal surface; a plurality of light sources disposed so as to be arrayed on the principal surface of the substrate; and a light distribution control element being disposed on the principal surface of the substrate so as to cover the plurality of light sources, and changing a light distribution of light emitted from the light sources. The light distribution control element includes: a first lens having a longitudinal part in an arrangement direction of the light sources; and a second lens being disposed at one end or both ends in a longitudinal direction of the first lens and having a fixed position where being disposed. Further, the first lens is held by the second lens, and the second lens has light distribution characteristics different from those of the first lens.SELECTED DRAWING: Figure 7 【課題】配光制御素子の長手の方向にも配光制御が可能で、かつ、熱膨張または熱収縮に対する許容度を有する面光源装置の提供を目的とする。【解決手段】本発明に係る面光源装置は、主面を含む基板と、基板の主面に列をなして配置される複数の光源と、光源を覆うように基板の主面上に配置され、光源から出射する光の配光を変更する配光制御素子とを備える。その配光制御素子は、光源の配列方向に長手を有する第１レンズと、第１レンズの長手の方向の一端または両端に配置され、かつ、その配置された位置が固定される第２レンズとを含む。そして、第１レンズは、第２レンズに保持され、第２レンズは、第１レンズとは異なる配光特性を有する。【選択図】図７