PLANAR LIGHTING DEVICE

• Main Authors: ITO GINGA, FUJIWARA MASAYA
• Format: Patent
• Language: English; Japanese
• Published: 13.09.2023
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

To reduce luminance unevenness and chromaticity unevenness, and to achieve reduction in the number of lenses, in a downright type planar lighting device.SOLUTION: A planar lighting device 1 in an embodiment includes: a substrate 2; a first optical element 5a; a second optical element; a third optical element; a pair of fourth and fifth optical elements; and a sixth optical element 10a. The first optical element is arranged on the emission side of a plurality of light sources, and condenses the light emitted from the plurality of light sources. The second optical element is inclined with respect to a first axial direction in an emission surface. The third optical element spreads in the first axial direction. The pair of fourth and fifth optical elements spreads light in a second axial direction orthogonal to the first axial direction in the emission surface. The sixth optical element 10a is replaced by the second optical element and the third optical element by the second optical element and the third optical element being combined together.SELECTED DRAWING: Figure 14 【課題】直下型の面状照明装置において、輝度ムラや色度ムラの低減が可能であるとともに、レンズ枚数の削減を図ること。【解決手段】実施形態の面状照明装置１は、基板２と、第１の光学素子５ａと、第２の光学素子と、第３の光学素子と、一対の第４および第５の光学素子と、第６の光学素子１０ａとを備える。前記第１の光学素子は、前記複数の光源の出射側に配置され、前記複数の光源から出射された光を集光する。前記第２の光学素子は、出射面内の第１の軸方向に対して傾ける。前記第３の光学素子は，前記第１の軸方向に広げる。前記一対の第４および第５の光学素子は、出射面内で前記第１の軸方向と直交する第２の軸方向に光を広げる。前記第６の光学素子１０ａは、前記第２の光学素子と前記第３の光学素子とが複合されて前記第２の光学素子および前記第３の光学素子に代替される。【選択図】図１４