Hollow panel

Abstract

A hollow panel ( 10 ) includes comprise hollow portions ( 12 ) between front and rear outer sides ( 11 ) having a substantially flat plate shape. In the hollow panel ( 10 ), the surface density is partially differentiated, whereby a lack of sound insulation due to the coincidence effect at a specific frequency is prevented from occurring. The surface density or the rigidity can be made non-uniform to suppress the lack of sound insulation, by differentiating sectional areas by forming plural kinds of widths of the hollow portions ( 12 ), or by differentiating the distances between partition walls ( 13 ) or the thicknesses of the walls.

What is clamed is:  
     
         1 . A hollow panel comprising: 
 first hollow portions arranged in a substantially same plane and having a first sectional areas; and    second hollow portions arranged in the substantially same plane and having a second sectional areas different from the first sectional areas.    
     
     
         2 . The hollow panel according to  claim 1 , wherein the first hollow portion and the second hollow portion are alternatively arranged in the substantially same plane.  
     
     
         3 . The hollow panel according to  claim 1 , wherein a solid portion forming member is inserted into a specific one of the first and second hollow portions, the solid portion forming member having a section shape which substantially corresponds to a section shape of the specific hollow portion.  
     
     
         4 . The hollow panel according to  claim 1 , wherein a sectional shape of the first and second hollow portions is a trapezoidal.  
     
     
         5 . A hollow panel comprising: 
 first hollow portions arranged in a substantially same plane and having a first width; and    second hollow portions arranged in the substantially same plane and having a second width different from the first width.    
     
     
         6 . The hollow panel according to  claim 5 , wherein the first width is defined between a pair of partition walls defining the first hollow portion, and the second width is defined between a pair of partition walls defining the second hollow portion.  
     
     
         7 . The hollow panel according to  claim 5 , wherein the first and second hollow portions are alternatively arranged in the substantially same plane.  
     
     
         8 . The hollow panel according to  claim 5 , wherein a solid portion forming member is inserted into a specific one of the first and second hollow portions, the solid portion forming member having a section shape which substantially corresponds to a section shape of the specific hollow portion.  
     
     
         9 . The hollow panel according to  claim 5 , wherein a sectional shape of the first and second hollow portions is a trapezoidal.  
     
     
         10 . A hollow panel comprising: 
 first and second partition walls defining a plurality of hollow portions arranged in a substantially same plane, wherein a thickness of the first partition walls is different from that of the second partition walls.    
     
     
         11 . The hollow panel according to  claim 10 , wherein the first and second partition walls are alternatively arranged.  
     
     
         12 . The hollow panel according to  claim 10 , wherein a solid portion forming member is inserted into a specific one of the hollow portions, the solid portion forming member having a section shape which substantially corresponds to a section shape of the specific hollow portion.