Teijin Chemicals Limited

Masanori Monri

Yoshihiko Imanaka

Yutaka Taketani

Kunio Hatanaka

Haruhisa Hoshimi

Yasuhiro Shimidzu

There are provided an optical element that comprises a polymer which has a structural unit derived from a specific dihydroxy compound typified by 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoro propane (bisphenol AF) and in which the relationship between a refractive index nand an Abbe number &#x3bd;satisfies the following formula (I):+0.0076&#xd7;&#x3bd;&#x2266;1.78&#x2003;&#x2003;(I)and that is used for correction of chromatic aberration, and an achromatic lens using the optical element.

Optical element and achromatic lens

Method of producing a bromine compound having an aliphatic unsaturated bond which includes reacting a compound having an aliphatic unsaturated bond represented by the following general formula (1) with bromine:

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Chiyoda-ku, Japan

Masanori Monri