Lens hood
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.
1 . 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 (d 1 ) of 0.05 μm or more and 0.4 μm or less and (B2) having a particle diameter (d 2 ) 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.
2 . The lens hood according to claim 1 , wherein (B1) comprises carbon black.
3 . The lens hood according to claim 2 , wherein, on an outermost surface of a surface formed with a membrane, glossiness against an incident light with an incident angle of 60° is less than 1%, glossiness against an incident light with an incident angle of 85° is less than 5%, reflectance against a light having a wavelength of 550 nm is 4% or less, an L value in CIELAB color space system by SCE method of 22 or less, and an optical density is 1.0 or more.
4 . The lens hood according to claim 3 , on an outermost surface of a surface formed with a membrane, a maximum height Rz based on JIS B0601: 2001 is 7 μm or more, an average length Rsm of contour curve elements is 80 μm or more, a skewness Rsk of a contour curve is 0.3 or less, and Kurtosis of a contour curve Rku is 3 or more.
5 . The lens hood according to claim 1 , wherein, on an outermost surface of a surface formed with a membrane, glossiness against an incident light with an incident angle of 60° is less than 1%, glossiness against an incident light with an incident angle of 85° is less than 5%, reflectance against a light having a wavelength of 550 nm is 4% or less, an L value in CIELAB color space system by SCE method of 22 or less, and an optical density is 1.0 or more.
6 . The lens hood according to claim 5 , on an outermost surface of a surface formed with a membrane, a maximum height Rz based on JIS B0601: 2001 is 7 μm or more, an average length Rsm of contour curve elements is 80 μm or more, a skewness Rsk of a contour curve is 0.3 or less, and Kurtosis of a contour curve Rku is 3 or more.
7 . The lens hood according to claim 1 , wherein (B2) comprises at least one selected from a group consisting of a composite silica obtained by synthesizing carbon black and silica at a nano level, a conductive silica and a black silica.
8 . The lens hood according to claim 7 , wherein (B1) comprises carbon black.
9 . The lens hood according to claim 7 , wherein the particle diameter (d 2 ) of (B2) is 10 times or more and 40 times or less the particle diameter (d1) of (B1).
10 . The lens hood according to claim 7 , wherein (B) contains unevenness forming particles other than (B1) and (B2), a particle diameter (dmax) of the unevenness forming particles having the maximum particle diameter is 10 times or more and 40 times or less a particle diameter (dmin) of the unevenness forming particles having the minimum particle diameter.
11 . The lens hood according to claim 7 , wherein (A) comprises an acrylic resin.
12 . The lens hood according to claim 1 , wherein the particle diameter (d 2 ) of (B2) is 10 times or more and 40 times or less the particle diameter (d 1 ) of (B1).
13 . The lens hood according to claim 1 , wherein (B) contains unevenness forming particles other than (B1) and (B2), a particle diameter (dmax) of the unevenness forming particles having the maximum particle diameter is 10 times or more and 40 times or less a particle diameter (dmin) of the unevenness forming particles having the minimum particle diameter.
14 . The lens hood according to claim 1 , wherein (A) comprises an acrylic resin.
15 . 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 (d 1 ) of 0.05 μm or more and 0.4 μm or less and (B2) having a particle diameter (d 2 ) 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.