Lens unit and camera module
AssigneeSomar Corporation
InventorNaoki Sakazume
Life of this patent
Estimating the term…
Abstract
A lens unit including a ring-shaped light-shielding member, which is effective to remove unnecessary lights entering to the lens unit of a camera module, and a camera module provided with the unit. The camera module includes the lens unit and an image pickup element for picking up an image of a subject through the lens unit. The lens unit has a group of lenses composed of lenses stacked in the direction of an optical axis X. Spacers are provided between lenses. An antireflection film is provided at least on an end surface side of at least one of substrates, which are bodies of the spacers. The antireflection film is configured by a membrane having a thickness of 2 μm or more and 40 μm or less formed from a liquid composition having a specific composition by spray coating
Claims20
A lens unit, configured by providing a group of lenses, which is composed of a plurality of lenses stacked in the direction of an optical axis, in a holder,
- wherein
- a ring-shaped light-shielding member is provided between at least one pair of lenses;
- the light-shielding member has an antireflection film at least on an end surface;
- the antireflection film is configured by a membrane having a thickness of greater than or equal to 2 μm and less than or equal to 40 μm formed from a liquid composition by spray coating;
- the liquid composition comprises at least (A), (B) and (C);
- (B) is contained in an amount of 20% or more by mass and 60% or less by mass in a total amount of 100% by mass of all solid content in the composition;
- (B) comprises (B1) and (B2) in an amount of 90% or more by mass and a mass ratio of (B2) with respect to (B1):
- is greater than or equal to 1.8 and less than or equal to 3.3;
- (A) is a resin component;
- (B) is unevenness forming particles;
- (B1) is inorganic-type small particles having a particle diameter of greater than or equal to 0.05 μm and less than or equal to 0.4 μm;
- (B2) is inorganic-type large particles having a particle diameter of greater than or equal to 2 μm and less than or equal to 6 μm;
- and
- (C) is a diluent solvent.
An antireflection film, formed on components of a lens unit, configured by a membrane having a thickness of greater than or equal to 2 μm and less than or equal to 40 μm formed from a liquid composition by spray coating:
- wherein
- the liquid composition comprises at least (A), (B) and (C);
- (B) is contained in an amount of 20% or more by mass and 60% or less by mass in a total amount of 100% by mass of all solid content in the composition;
- (B) comprises (B1) and (B2) in an amount of 90% or more by mass, and a mass ratio of (B2) with respect to (B1):
- is greater than or equal to 1.8 and less than or equal to 3.3;
- (A) is a resin component;
- (B) is unevenness forming particles;
- (B1) is inorganic-type small particles having a particle diameter of greater than or equal to 0.05 μm and less than or equal to 0.4 μm;
- (B2) is inorganic-type large particles having a particle diameter of greater than or equal to 2 μm and less than or equal to 6 μm;
- and
- (C) is a diluent solvent.
Dependencies are inferred from the claim text.