Electrical apparatus and method for producing electrical apparatus

Abstract

Regarding an electrical apparatus, in an opposing part facing a board, the opposing part being on a surface of in a heat dissipator, a contact part which is brought into contact with a first region of a second main surface corresponding to an electrical component and a surrounding region of the electrical component and which is brought into contact with a second region of the second main surface corresponding to a fixing member and a surrounding region of the fixing member protrudes relative to a portion of the opposing part other than the contact part. The degree of flatness of a contact surface, in the contact part, that is brought into contact with the first region and the second region is higher than the degree of flatness of a surface of the opposing part other than the contact surface.

The invention claimed is:  
     
       1. An electrical apparatus comprising:
 a board which includes a first main surface and a second main surface and in which an electrical component is attached to the first main surface; 
 a heat dissipator; and 
 a fixing member which fixes the second main surface of the board and the heat dissipator together in such a manner as to be in contact with each other, by passing through the board from the first main surface to the second main surface to be inserted in the heat dissipator, wherein 
 in an opposing part facing the board, the opposing part being on a surface of the heat dissipator, a contact part which is directly brought into contact with a first region of the second main surface corresponding to the electrical component and a surrounding region of the electrical component and which is directly brought into contact with a second region of the second main surface corresponding to the fixing member and a surrounding region of the fixing member protrudes relative to a portion of the opposing part other than the contact part, and 
 the degree of flatness of a contact surface, in the contact part, that is brought into contact with the first region and the second region is higher than the degree of flatness of a surface of the opposing part other than the contact surface. 
 
     
     
       2. An electrical apparatus comprising:
 a board which includes a first main surface and a second main surface and to which an electrical component is attached; 
 a heat dissipator, and 
 a fixing member which fixes the board and the heat dissipator together by passing through the board from the first main surface to the second main surface to be inserted in the heat dissipator, wherein 
 the electrical component includes a projecting portion projecting from the second main surface of the board, and a tip of the projecting portion is directly in contact with the heat dissipater, and 
 on the surface of the heat dissipator, the degree of flatness of a contact surface that is brought into contact with the projecting portion of the electrical component is higher than the degree of flatness of a surface of an opposing part other than the contact surface, the opposing part facing the board. 
 
     
     
       3. The electrical apparatus according to  claim 2 , wherein
 the fixing member reaches the heat dissipator by being inserted through a first heat dissipation member which is in close contact with the board and the heat dissipator between the board and the heat dissipator, and 
 on the surface of the heat dissipator, the degree of flatness of the contact surface that is brought into contact with the projecting portion of the electrical component and the degree of flatness of a contact surface that is brought into contact with the first heat dissipation member are higher than the degree of flatness of a surface of the opposing part other than these contact surfaces. 
 
     
     
       4. The electrical apparatus according to  claim 2 , wherein
 in the opposing part, a contact part which is directly brought into contact with a member region of the second main surface corresponding to the fixing member and a surrounding region of the fixing member protrudes relative to a portion of the opposing part other than the contact part, and 
 the degree of flatness of the contact surface, on the surface of the heat dissipator, that is directly brought into contact with the projecting portion of the electrical component or the first heat dissipation member, and the degree of flatness of a contact surface, in the contact part, that is brought into contact with the member region are higher than the degree of flatness of a surface of the opposing part other than these contact surfaces. 
 
     
     
       5. An electrical apparatus comprising:
 a board which includes a first main surface and a second main surface and in which an electrical component is attached to the first main surface; 
 a heat dissipator; and 
 a fixing member which fixes the second main surface of the board and the heat dissipator together in such a manner as to be in contact with each other, by passing through the board from the first main surface to the second main surface to be inserted in the heat dissipator, wherein 
 in an opposing part facing the board, the opposing part being on a surface of the heat dissipator, a contact part which is directly brought into contact with a component region of the second main surface corresponding to the electrical component and a surrounding region of the electrical component protrudes relative to a portion of the opposing part other than the contact part, and 
 the fixing member reaches the heat dissipator by being inserted through a second heat dissipation member which is in close contact with the board and the heat dissipator between the board and the heat dissipator, and 
 the degree of flatness of a contact surface, in the contact part, that is brought into contact with the component region, and the degree of flatness of a contact surface, in the heat dissipator, that is brought into contact with the second heat dissipation member are higher than the degree of flatness of a surface of the opposing part other than these contact surfaces. 
 
     
     
       6. The electrical apparatus according to  claim 1 , wherein
 the electrical component is attached to a vicinity of the fixing member. 
 
     
     
       7. The electrical apparatus according to  claim 1 , wherein
 the electrical apparatus is a radio communication device which includes an amplifier for amplifying a radio signal, as the electrical component. 
 
     
     
       8. The electrical apparatus according to  claim 2 , wherein
 the electrical component is attached to a vicinity of the fixing member. 
 
     
     
       9. The electrical apparatus according to  claim 5 , wherein
 the electrical component is attached to a vicinity of the fixing member. 
 
     
     
       10. The electrical apparatus according to  claim 2 , wherein
 the electrical apparatus is a radio communication device which includes an amplifier for amplifying a radio signal, as the electrical component. 
 
     
     
       11. The electrical apparatus according to  claim 5 , wherein
 the electrical apparatus is a radio communication device which includes an amplifier for amplifying a radio signal, as the electrical component.