Resin molding, printer, and method for manufacturing resin molding

Abstract

A resin molding has a first surface and a second surface, wherein the second surface includes a rib, and wherein the first surface includes a glossy portion and a non-glossy portion.

What is claimed is: 
     
         1 . A resin molding comprising:
 a first surface; and   a second surface,   wherein the first surface includes a glossy portion and a non-glossy portion, and the second surface includes a rib.   
     
     
         2 . The resin molding according to  claim 1 , wherein glossiness of the glossy portion is equal to or greater than 80%. 
     
     
         3 . The resin molding according to  claim 1 , wherein a kurtosis value of the non-glossy portion is equal to or greater than 3.5. 
     
     
         4 . The resin molding according to  claim 1 , wherein a radius of curvature of a cross section of a boundary portion of the non-glossy portion and the glossy portion is equal to or less than 20 μm. 
     
     
         5 . The resin molding according to  claim 1 , wherein the non-glossy portion is raised from the glossy portion by equal to or greater than 40 μm and less than 500 μm. 
     
     
         6 . The resin molding according to  claim 1 , wherein the non-glossy portion has a repetitive pattern. 
     
     
         7 . The resin molding according to  claim 6 , wherein a pitch of the non-glossy portion is equal to or greater than 0.063 mm and equal to or less than 4.0 mm. 
     
     
         8 . The resin molding according to  claim 6 , wherein the repetitive pattern is a grid pattern. 
     
     
         9 . A printer comprising a document platen cover, wherein the document platen cover is a resin molding comprising:
 a first surface; and   a second surface,   wherein the first surface includes a glossy portion and a non-glossy portion, and the second surface includes a rib.   
     
     
         10 . The printer according to  claim 9 , wherein the document platen cover includes acrylonitrile butadiene styrene (ABS) or high impact polystyrene containing rubber particles. 
     
     
         11 . A method for manufacturing a resin molding by injecting a resin into a cavity in a metal mold including a first metal mold and a second metal mold, the method comprising:
 forming, in the first cavity, a shape from which a glossy portion having a glossiness of equal to or greater than 80% is transferred and a shape from which a non-glossy portion having a kurtosis value of equal to or greater than 3.5 is transferred; and   forming, in the second cavity, a shape from which a rib is transferred.   
     
     
         12 . The method for manufacturing the resin molding according to  claim 11 , wherein the shape from which the glossy portion is transferred is processed using a rotary polishing tool and diamond paste. 
     
     
         13 . The method for manufacturing the resin molding according to  claim 11 , wherein the shape from which the non-glossy portion is transferred is processed using a ball end mill.