Olympus Corporation

Kunihisa Obi

Koji Kobayashi

Tetsuhide Takeyama

Atsushi Goto

Michio Shirai

Naohito Shiga

Takae Hayashi

A resin composition of the present invention contains: an epoxy resin (A); a hardener (B); and an ion exchanger (C). At least one of the epoxy resin (A) and the hardener (B) contains a modified silicone (S), and the epoxy resin (A) is at least one type selected from the group consisting of a bisphenol A type epoxy resin, a bisphenol F type epoxy resin, a phenol novolac type epoxy resin, and an epoxy-modified silicone.

Resin composition, backing material for ultrasonic vibrator, ultrasonic vibrator, and ultrasonic endoscope

Provided are an optical material composition and an optical element that not only exhibit desirable anomalous dispersion properties but are also easy to process. The material composition for use in the optical element contains 5 weight % to 50 weight % of niobium (V) oxide fine particles (A), 49 weight % to 94 weight % of an organic compound (B) having one or more polymerizable functional groups in one molecule thereof, and 0.05 weight % to 5 weight % of a polymerization initiator (C).

Material composition and optical elements using the same

The invention provides an optical element that has a low refractive-index chromatic dispersion, a high degree of freedom in molding or forming as is the case with synthetic resins, and moldability or formability that lends itself to mass production. The optical element is obtained by molding or otherwise forming a composition containing a first material that is a fine particle having an Abbe number vd of 80 or greater indicative of a chromatic dispersion in a visible range and having a size of less than 400 nm, and a second material that is an organic/inorganic hybrid material comprising an organic polymer material having a carbon-carbon bond in a main chain and an inorganic component.

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Tokyo, Japan

Kunihisa Obi