Portable electronic apparatus having optional components in a shielded recess for function expansion

A portable electronic apparatus comprising:

• a base unit having a bottom surface, the bottom surface having a holding recess having interior walls the interior walls having a receiving area extending parallel with the bottom surface of the base unit, the interior walls and the receiving area being covered with a first conductive layer;
• an optional component unit for function expansion which is mounted in the holding recess, the optional component unit including a printed circuit board having a marginal edge portion, a conductive circuit pattern on the circuit board and circuit parts electrically connected to the circuit pattern;
• a board support mounted in the holding recess supporting the printed circuit board and including a base wall having a size corresponding to that of the printed circuit board, the base wall covering a side of the printed circuit board, the board support having side walls continuous with the base wall being disposed between the marginal edge portion of the printed circuit board and the interior walls, the base wall and side walls being made of an electrically insulating material;
• a cover removably attached to the base unit and covering the holding recess, the cover being flush with the bottom surface and having an engaging portion engaging the receiving area, a surface of the cover facing the holding recess being covered with a second conductive layer for electromagnetic shielding, the second conductive layer, together with the first conductive layer, surrounding the optional component unit to achieve an electromagnetic shield;
• and
• fixing means for fixing the cover to the base unit, the fixing means pressing the cover against the engaging area to place the first conductive layer in close contact with the second conductive layer so that an electrical connection is maintained.

A portable electronic apparatus comprising:

• a base unit including a peripheral surface, the base unit having a holding recess having interior walls being covered with a conductive layer for electromagnetic shielding;
• an optional component unit for function expansion which is mounted in the holding recess, the optional component unit including a printed circuit board having a marginal edge portion, the printed circuit board including a conductive circuit pattern and circuit parts electrically connected to the circuit pattern;
• a conductive cover removably attached to the base unit and covering the holding recess to conceal the optional component unit, the cover being electrically connected to the conductive layer and together with the conductive layer, surrounding the optional component unit so that an electromagnetic shield is achieved;
• and
• a support member holding the optional component unit in the holding recess and made of electrically insulting material, the support member including a base plate having a size corresponding to that of the printed circuit board, the base plate being disposed between the printed circuit board and the cover, and a flange continuous with the base plate, the flange surrounding the marginal edge portion of the printed circuit, the flange having an engaging portion engaging the marginal edge portion of the printed circuit board to hold the printed circuit board in the support member, the support member being mounted in the holding recess.

A portable electronic apparatus comprising:

• a base unit having a peripheral surface, the base unit including a holding recess in the peripheral surface, the holding recess having interior walls covered with a conductive layer for electromagnetic shielding;
• a non-conductive board support mounted in the holding recess;
• a component unit for functional expansion mounted to the board support within the holding recess, the component unit including a printed circuit board having a peripheral edge, the printed circuit board including a conductive circuit pattern and circuit parts electrically connected to the conductive circuit pattern, the board support forming a non-conductive barrier between the peripheral edge of the circuit board and the conductive layer of the holding recess;
• and
• a conductive cover removably attached to the base unit and covering the holding recess so that the optional component unit is concealed within the holding recess, the cover being electrically connected to the conductive layer of the holding recess, forming with the conductive layer a conductive shield around the component.

A portable electronic apparatus comprising:

• a base unit having a peripheral surface, the base unit including a holding recess in the peripheral surface, the holding recess having interior walls covered with a conductive layer for electromagnetic shielding;
• a non-conductive board support mounted in the holding recess;
• a component unit for functional expansion mounted to the board support within the holding recess, the component unit including a printed circuit board having a peripheral edge, the printed circuit board including a conductive circuit pattern and circuit parts electrically connected to the conductive circuit pattern, the board support forming a non-conductive barrier, the barrier having an engaging portion for engaging the peripheral edge of the printed circuit board and the engaging portion being disposed so as to prevent electrical contact between the peripheral edge of the printed circuit board and the conductive layer of the holding recess;
• and
• a conductive cover removably attached to the base unit and covering the holding recess so that the optional component unit is concealed within the holding recess, the cover being electrically connected to the conductive layer of the holding recess, forming with the conductive layer a conductive shield around the component.