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US 6,550,987 B2Granted
Light shielding blade and method of manufacturing the same
AssigneeNidec Copal Corporation
InventorTakao Ogawa
Life of this patent
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AssigneeNidec Copal Corporation
InventorTakao Ogawa
Estimating the term…
A reflection preventing treatment is performed with respect to an edge face of a light shielding blade. The blade is composed of a film material made of a polyester, and is formed into a predetermined shape as a base piece. A flat face portion of the blade is capable of shielding an incident light, and an edge face portion is present in perpendicularly crossing to the flat face portion. An inner edge face of an aperture opening is included in this edge face portion. In order to form the blade, at first the base piece is punched from the film material in a predetermined shape. Subsequently, a chemical etching is applied to the edge face portion of the punched base piece so as to roughen the edge face portion. Accordingly, it is possible to suppress an unnecessary reflection of the incident light at the edge face portion. It is possible to evenly and efficiently roughen the inner edge face of the aperture opening by collecting a multiplicity of punched base pieces and dipping them in an etching solution.
A light shielding blade being comprised of a base piece cut from a film material made of a polyester, and having a major surface portion capable of shielding an incident light and an edge face portion capable of suppressing reflection of the incident light, said edge face portion having a porous surface layer structure,
A light shielding blade formed by a process comprising the steps of:
A light shielding blade being comprised of a base cut from a film material made of a polyester, and having a major surface portion capable of shielding an incident light and an edge face portion capable of suppressing reflection of the incident light, said edge face portion having a porous surface layer structure wherein pores of said porous surface layer have a diameter of less than 10 μm.
A light shielding blade being comprised of a base cut from a film material made of a polyester, and having a major surface portion capable of shielding an incident light and an edge face portion capable of suppressing reflection of the incident light, said edge face portion having a porous surface layer structure wherein the pores vary in diameter, and the diameter of the larger of said pores is no more than about one-sixth of a thickness of said base cut.
Dependencies are inferred from the claim text.