The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 02, 2022
Filed:
Oct. 21, 2015
Tokai Optical Co., Ltd., Okazaki, JP;
Miyoshi Oil & Fat Co., Ltd., Tokyo, JP;
Yuichi Shishino, Aichi, JP;
Shingo Ono, Aichi, JP;
Koji Kawai, Tokyo, JP;
Kotaro Kaneko, Tokyo, JP;
Nobuhiro Kaneko, Tokyo, JP;
TOKAI OPTICAL CO., LTD., Aichi, JP;
MIYOSHI OIL & FAT CO., LTD., Tokyo, JP;
Abstract
To provide a plastic lens which can absorb light with a wavelength of 400 to 420 nm with sufficiently high efficiency but is reduced in the absorption of light with a wavelength of around 420 nm or longer, is less affected by harmful light, suppresses yellow coloration and therefore has excellent appearance, suppresses yellowish discoloration over time, and has excellent heat resistance, light resistance, and also optical performance, particularly an excellent Abbe's number. The plastic lens is characterized by containing an ultraviolet absorbing agent represented by the following formula (I): (in the formula, Rto Reach independently represent a monovalent group such as a hydrogen atom, Rrepresents a monovalent sulfur-containing group represented by the following formula (i): (in the formula, Rrepresents a divalent hydrocarbon group with 1 to 20 carbon atoms or the like; Rrepresents a divalent hydrocarbon group with 1 to 20 carbon atoms or the like; Rrepresents a monovalent hydrocarbon group with 1 to 20 carbon atoms; the total number of carbon atoms in R, n number of R, and Ris 30 or less; m represents an integer of 0 or 1; and n represents an integer of 0 to 3)), and a resin material.