Hoya Corporation

Key Coffee Inc.

Kazuo Kawamata

Makoto Adachi

You Yamamori

Masahiro Takenaka

Takeshi Sou

Syouzo Fujii

Hiromitsu Ueda

Tsuneo Muraki

The purpose of the invention is to provide a very safe opener cap that can easily open a film serving as a section to be opened without scattering the contents. A can body () and a screw cap () are screwed together, and the screw cap () and an opener () are ratcheted together so as to rotate as a unit in the direction of the screw cap () tightening. Blade angles of an annular blade () are configured so that the blade angle in the direction of the screw cap () loosing is gentler than the blade angle in the direction of tightening.

Opener cap

An antireflection film is formed by alternately laminating a low refractive index layer and a high refractive index layer. The antireflection film has a reflectance of 10% or less and an excitation purity range of 10 or less for visible light in a wavelength range from 380 nm to 780 nm incident at an incident angle ranging from 0&#xb0; to 45&#xb0; when regarding the direction perpendicular to the surface as 0&#xb0;. The antireflection film inhibits a specific color tone from occurring in interference color of incident light coming from an oblique direction.

Optical device and antireflection film

Growing community of inventors

Tokyo, Japan

Kazuo Kawamata