Canon Denshi Kabushiki Kaisha

Munetoshi Yoshikawa

Mizuho Igawa

Kazuo Suzuki

Fumio Shimada

Keita Hanawa

Naoaki Maruyama

Takayuki Wakabayashi

Masayuki Uchiyama

Minoru Kobayashi

Junichi Onosaka

Yuki Saito

Michio Yanagi

Yaomin Zhou

Kana Matsuda

Michiyo Hashizume

To allow a fiber reinforced laminate to have sufficient light shielding ability and to improve adherence at the interface in the laminate and durability needed for it used for a shutter blade. A fiber reinforced laminate of the present invention includes: a substrate; a black coating; and a fiber reinforced plastic layer, characterized in that the black coating is provided between the substrate and the fiber reinforced plastic layer and contains a binder resin, black particles and a filler.

Fiber reinforced plastic body, shutter device and optical apparatus

Fiber reinforced laminate, shutter device and optical apparatus

There is provided with a fiber-reinforced laminate. The fiber-reinforced laminate has a first fiber-reinforced layer and a second fiber-reinforced layer. The fiber-reinforced laminate also has a metal layer provided between the first fiber-reinforced layer and the second fiber-reinforced layer.

Fiber-reinforced laminate, shutter device and camera

A spectral reflectance in the entire visible wavelength range may be decreased to decrease inconveniences in an image such as flare or ghost. A non-reflective periodic layer including a large number of fine uneven periodic structure bodies is formed on a substrate, and a neutral density ('ND') film is formed on the other surface of the substrate by vacuum deposition, to improve an anti-reflection function. Regarding a beam entering the ND filter, the MgFfilm of the formed ND film suppresses the spectral reflectance at the boundary of the atmosphere and the ND film and at the boundary of the ND film and the substrate. The non-reflective periodic layer decreases the reflectance at the boundary of the substrate and the atmosphere.

Neutral density optical filter and image pickup apparatus

This invention decreases deformation of a plastic substrate caused by thermal expansion and contraction in an evaporation process of forming a multi-layered film of an ND filter, thus helping prevent wrinkles. The plastic substrate serving as the base of the ND filter is made of a polyimide-based plastic material having a glass transition temperature of 200&#xb0; C. or more, has a total transmittance of light of 90% or more, and has a haze factor of 0.5% or less. As the multi-layered film, AlOfilms for reduction of the reflectance and TiOfilms for reduction of the transmittance are alternately formed on the substrate.

ND filter for aperture device and aperture device comprising ND filter

Growing community of inventors

Chichibu, Japan

Munetoshi Yoshikawa