Electronic apparatus including circuit board chassis

1. An electronic apparatus comprising:

a circuit board on which electronic component is mounted; and

a chassis housing said circuit board,

said chassis being provided with a biasing force applying member applying a biasing force to at least one of top and bottom surfaces of said circuit board to hold said circuit board in position such that said circuit board is allowed to be displaced

in a direction parallel to a plane of said circuit board,

said biasing force applying member is made of a rubber material and is provided, in a compressed state, between said top surface of said circuit board and an inner surface of said chassis, a bottom surface of said rubber material slidably abutting on said top surface of said circuit board, and

said circuit board is formed with a through hole, and said chassis has a positioning projection formed in said inner surface thereof, said through hole loosely receiving said positioning projection, said bottom surface of said rubber material facing said positioning projection across from said circuit board.

2. The electronic apparatus according to claim 1 , wherein, said biasing force is applied to said top surface of said circuit board, and a film is provided on an inner surface of said chassis at a region contacting said bottom surface of said circuit board, said film having a friction coefficient smaller than that of said inner surface of said chassis.

3. The electronic apparatus according to claim 1 , wherein said biasing force applying member has a cross-sectional area that gradually decreases toward a tip portion thereof which is in contact with said top surface of said circuit board.

4. The electronic apparatus according to claim 1 , wherein said rubber material has a recess formed in said bottom surface thereof.

5. An electronic apparatus comprising:

a circuit board on which electronic component is mounted; and

a chassis housing said circuit board,

said chassis being provided with a biasing force applying member applying a biasing force to at least one of top and bottom surfaces of said circuit board to hold said circuit board in position such that said circuit board is allowed to be displaced

in a direction parallel to a plane of said circuit board,

wherein said circuit board is formed with a through hole, and said chassis has a positioning projection formed in said inner surface thereof, said through hole loosely receiving said positioning projection, a bottom surface of said biasing force applying member facing said positioning projection across from said circuit board.

6. The electronic apparatus according to claim 5 , wherein said biasing force applying member is made of a rubber material having a cylindrical shape, and is provided, in a compressed state, between said top surface of said circuit board and an inner surface of said chassis, a bottom surface of said rubber material slidably abutting on said top surface of said circuit board.

7. The electronic apparatus according to claim 5 , wherein said biasing force applying member is a spring.

8. The electronic apparatus according claim 5 , wherein said biasing force applying member is a blade spring.

9. The electronic apparatus according to claim 6 , wherein said rubber material has a recess formed in said bottom surface thereof.

10. The electronic apparatus according to claim 5 , wherein said biasing force is applied to said top surface of said circuit board, and a film is provided on an inner surface of said chassis at a region contacting said bottom surface of said circuit board, said film having a friction coefficient smaller than that of said inner surface of said chassis.

11. The electronic apparatus according to claim 5 , wherein said biasing force applying member is made of a rubber material whose cross-sectional area gradually decreases toward a tip portion thereof which is in contact with said top surface of said circuit board.