US 12,111,444 B2
Optical element
Akito Sawada, Osaka (JP); and Masaki Hashimoto, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/287,463
Filed by PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
PCT Filed Jun. 11, 2020, PCT No. PCT/JP2020/023874
§ 371(c)(1), (2) Date Apr. 21, 2021,
PCT Pub. No. WO2020/251060, PCT Pub. Date Dec. 17, 2020.
Claims priority of application No. 2019-111276 (JP), filed on Jun. 14, 2019.
Prior Publication US 2021/0389507 A1, Dec. 16, 2021
Int. Cl. G02B 1/14 (2015.01); G02B 1/04 (2006.01); G02B 1/18 (2015.01); G02B 13/00 (2006.01); B60R 11/04 (2006.01); G02B 1/115 (2015.01); G08B 13/196 (2006.01)
CPC G02B 1/14 (2015.01) [G02B 1/04 (2013.01); G02B 1/18 (2015.01); G02B 13/001 (2013.01); B60R 11/04 (2013.01); G02B 1/115 (2013.01); G08B 13/196 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An optical element, comprising:
a base material and a stack covering of layers disposed on the base material, the base material comprising a resin material, wherein:
the stack covering comprises an optical multi-layered part composed of high refractive index layers each comprising Ta2O5 and low refractive index layers each comprising SiO2, the high refractive index layers and the low refractive index layers being alternately stacked in a form of 4 to 50 individual layers or,
a first high refractive index layer of the high refractive index layers comprises a fissured structure, the first high refractive index layer being situated most closely to the base material,
the fissured structure comprises a low molecular density part which is positioned between respective ones of high molecular density parts in the high refractive index layers,
the low molecular density part comprises Ta2O5, and
a molecular density of Ta2O5 of the low molecular density part is lower than a molecular density of Ta2O5 of each of the high molecular density parts.