Resin molded article, method for manufacturing the same, and printer

Abstract

A molded article has an exterior surface, a non-exterior surface, and a projecting or recessed portion provided on at least one of the exterior surface and the non-exterior surface. A repeated pattern of projections and/or recesses or a texture face, which serves to disturb the flow of resin, is provided on the non-exterior surface.

1 . A resin molded article comprising:
 an exterior surface;   a non-exterior surface; and   a projecting or recessed portion provided on at least one of the exterior surface and the non-exterior surface,   wherein a thickness between the exterior surface and the non-exterior surface is less than or equal to 3 mm, and   wherein the non-exterior surface includes at least a repeated pattern of projections and/or recesses other than the projecting or recessed portion, a PV value of the projections and/or recesses being in the range of 0.01 mm or more and 1 mm or less, and a width of the projections and/or recesses being smaller than a width of the resin molded article.   
     
     
         2 . The resin molded article according to  claim 1 , wherein when a projection plane is an arbitrary plane including a perpendicular line dropped to the non-exterior surface from a peak point of each of the projections and/or recesses on the resin molded article, A is an area of a projection of a contour of each of the projections and/or recesses when the contour is projected onto the projection plane, and B is an area of a triangular reference projection formed by connecting three points, which are the peak point and two end points of each of the projections and/or recesses, an area ratio η is defined as η=(A−B)/B, and is in the range of −1<η≦1. 
     
     
         3 . The resin molded article according to  claim 1 , wherein the projecting or recessed portion includes at least one of a rib, a polygonal column, a circular column, and a sphere. 
     
     
         4 . The resin molded article according to  claim 1 , wherein the repeated pattern of the projections and/or recesses is arranged such that a minimum distance from the projecting or recessed portion to the projections and/or recesses is three times a width of the projecting or recessed portion or less. 
     
     
         5 . The resin molded article according to  claim 4 , wherein the projections and/or recesses are disposed adjacent to the projecting or recessed portion. 
     
     
         6 . The resin molded article according to  claim 1 , wherein a maximum width of the projections and/or recesses on the non-exterior surface is in the range of 0.1 mm or more and 7.0 mm or less. 
     
     
         7 . The resin molded article according to  claim 1 , wherein the projections and/or recesses have a polygonal pyramid shape, a circular cone shape, a polygonal columnar shape, a circular columnar shape, a spherical-crown shape, a hemispherical shape, or a cone shape with a curved side surface. 
     
     
         8 . The resin molded article according to  claim 7 , wherein the projections and/or recesses have the cone shape with the curved side surface, and the curved side surface is formed of a singe type of curved surface or two or more types of curved surfaces. 
     
     
         9 . The resin molded article according to  claim 7 , wherein the projections and/or recesses in the repeated pattern are arranged along lines that are arranged adjacent and parallel to each other, and the adjacent lines are shifted from each other by a predetermined distance that is less than a maximum width of the projections and/or recesses on the non-exterior surface. 
     
     
         10 . The resin molded article according to  claim 7 , wherein the repeated pattern of projections and/or recesses includes a combination of at least two of the projections, recesses, and flat portions. 
     
     
         11 . The resin molded article according to  claim 7 , wherein the repeated pattern includes a combination of two or more types of projections and/or recesses selected from the projections and/or recesses having the polygonal pyramid shape, the circular cone shape, the polygonal columnar shape, the circular columnar shape, the spherical-crown shape, the hemispherical shape, and the cone shape with the curved side surface. 
     
     
         12 . A resin molded article comprising:
 an exterior surface;   a non-exterior surface; and   a projecting or recessed portion provided on at least one of the exterior surface and the non-exterior surface,   wherein a thickness between the exterior surface and the non-exterior surface is less than or equal to 3 mm, and   wherein the non-exterior surface includes a texture face other than the projecting or recessed portion, the texture face having a PV value in the range of 0.01 mm or more and 1 mm or less.   
     
     
         13 . The resin molded article according to  claim 12 , wherein the texture face on the resin molded article has a texture pattern including projections and/or recesses, the texture pattern being formed by a mold in which projections and/or recesses are formed by etching or sand blasting. 
     
     
         14 . The resin molded article according to  claim 13 , wherein when a projection plane is an arbitrary plane including a perpendicular line dropped to the non-exterior surface from a peak point of each of the projections and/or recesses on the resin molded article having the texture face, A is an area of a projection of a contour of each of the projections and/or recesses when the contour is projected onto the projection plane, and B is an area of a triangular reference projection formed by connecting three points, which are the peak point and two end points of each of the projections and/or recesses, an area ratio η is defined as η=(A−B)/B, and is in the range of −1<η≦1. 
     
     
         15 . The resin molded article according to  claim 12 , wherein a minimum distance from the projecting or recessed portion to the projections and/or recesses in the texture pattern of the texture face is three times a width of the projecting or recessed portion or less. 
     
     
         16 . The resin molded article according to  claim 12 , wherein a maximum width of the projections and/or recesses in the texture pattern on the non-exterior surface is in the range of 0.1 mm or more and 7.0 mm or less. 
     
     
         17 . The resin molded article according to  claim 1 , wherein the width of the projections and/or recesses is less than or equal to a width of the projecting or recessed portion on the exterior surface. 
     
     
         18 . A method for manufacturing the resin molded article according to  claim 1  by using a mold, the method comprising:
 forming grooves in the mold by moving a V-shaped end mill, the grooves being used to form the projections and/or recesses. 
 
     
     
         19 . A printer comprising:
 a document cover, which is the resin molded article according to  claim 1 .