Lens hood
AssigneeSomar Corporation
InventorNaoki Sakazume
Life of this patent
Estimating the term…
Abstract
A lens hood has an antireflection film for shielding an unnecessary light entering a photographic lens of a camera. Here, (A) indicates a resin component, (B) unevenness forming particles, (B1) inorganic-type small particles having a particle diameter (d1) of 0.05 μm to 0.4 μm, (B2) inorganic-type large particles having a particle diameter (d2) of 2 μm to 6 μm, and (C) a diluent solvent. The antireflection film is a membrane formed from a liquid composition via spray coating and has a thickness of 2 to 40 μm. The liquid composition has at least (A), (B) and (C). The (B) is contained in an amount of 20% by mass to 60% by mass in 100% by mass of a total amount of the total solid content in the composition. The (B) contains (B1) and (B2) in an amount of 90% by mass or more. A mass ratio of (B2) to (B1):1 is 1.8 to 3.3.
Claims15
A lens hood attached to a photographic lens on a side of a photography subject for shielding an unnecessary light entering to the photographic lens:
- wherein
- an inner wall surface of a hood body has an antireflection film;
- the antireflection film is configured by a membrane composed of a laminate of a solid particle formed from a liquid composition and having a thickness of 2 μm or more and 40 μm or less;
- the solid particle comprises at least (A) and (B), wherein
- (B) is contained in an amount of 20% by mass or more and 60% by mass or less in a total amount of 100% by mass of the solid particle;
- (B) comprises (B1) having a particle diameter (d1) of 0.05 μm or more and 0.4 μm or less and (B2) having a particle diameter (d2) of 2 μm or more and 6 μm or less in an amount of 90% by mass or more, and a mass ratio of (B2) with respect to (B1):1 is 1.8 or more and 3.3 or less;
- (A) is a resin component;
- (B) is unevenness forming particles;
- (B1) is inorganic-type small particles;
- and
- (B2) is inorganic-type large particles.
An antireflection film to be formed on an inner wall surface of a lens hood, configured by a membrane composed of a laminate of a solid particle formed from a liquid composition and having a thickness of 2 μm or more and 40 μm or less:
- wherein
- the solid particle comprises at least (A) and (B), wherein
- (B) is contained in an amount of 20% by mass or more and 60% by mass or less in a total amount of 100% by mass of the solid particle;
- (B) comprises (B1) having a particle diameter (d1) of 0.05 μm or more and 0.4 μm or less and (B2) having a particle diameter (d2) of 2 μm or more and 6 μm or less in an amount of 90% by mass or more, and a mass ratio of (B2) with respect to (B1):
- 1 is 1.8 or more and 3.3 or less;
- (A) is a resin component;
- (B) is unevenness forming particles;
- (B1) is inorganic-type small particles;
- and
- (B2) is inorganic-type large particles.
Dependencies are inferred from the claim text.