PHOSPHOR ELEMENT AND ILLUMINATION DEVICE

• Main Authors: EJIRI TETSUYA, HIGASHIHARA SHUHEI, IWATA YUICHI, OKADA NAOTAKE, KONDO JUNGO, ASAI KEIICHIRO, YAMAGUCHI SHOICHIRO
• Format: Patent
• Language: English; Japanese
• Published: 18.10.2018
• Subjects: BLASTING; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

PROBLEM TO BE SOLVED: To suppress color unevenness of emitted white light in continuous use, when fluorescent light is generated by making excitation light be incident on a phosphor plate.SOLUTION: A phosphor element 1A includes: a first heat dissipation substrate 6A; a second heat dissipation substrate 6B; a phosphor plate 2 including an incident face 2a of excitation light A, an opposite face 2b opposed to the incident face, a first joint face 2c opposed to the first heat dissipation substrate 6A, a second joint face 2d opposed to the second heat dissipation substrate 6B, and a pair of side faces 2e, 2f, and configured to convert the excitation light A incident on the phosphor plate into fluorescent light, and emit the fluorescent light and the excitation light from the opposite face or the incident face; a first joint layer 3A kept into contact with the first joint face 2c and composed of metal oxide; a second joint layer 3B kept into contact with the second joint face 2d and composed of metal oxide; a first reflection film 4A disposed between the first joint layer and the first heat dissipation substrate; and a second reflection film 4B disposed between the second joint layer and the second heat dissipation substrate.SELECTED DRAWING: Figure 1 【課題】蛍光体板に対して励起光を入射させて蛍光を発生させるのに際して、継続使用時に、出射する白色光の色ムラを抑制する。【解決手段】蛍光体素子１Ａは、第一の放熱基板６Ａ、第二の放熱基板６Ｂ、励起光Ａの入射面２ａ、入射面に対向する対向面２ｂ、第一の放熱基板６Ａに対向する第一の接合面２ｃ、第二の放熱基板６Ｂに対向する第二の接合面２ｄおよび一対の側面２ｅ、２ｆを備えている蛍光体板２であって、蛍光体板に入射する励起光Ａを蛍光に変換し、蛍光および励起光を対向面または入射面から出射させる蛍光体板２、第一の接合面２ｃに接し、金属酸化物からなる第一の接合層３Ａ、第二の接合面２ｄに接し、金属酸化物からなる第二の接合層３Ｂ、第一の接合層と第一の放熱基板との間に設けられた第一の反射膜４Ａ、および第二の接合層と第二の放熱基板との間に設けられた第二の反射膜４Ｂを備える。【選択図】 図１