Shield structure for information technology equipments

Abstract

A shield structure for information technology equipments includes an opening part provided in a portion of the shield structure and a lid covering the opening part. A signal ground line is provided on a printed circuit board accommodated in the enclosure. An electric connection material extends between the lid and the signal ground line of the printed circuit board and has at least a surface formed by an electrically conductive material. The electric connection material is in contact with the signal ground line of the printed circuit board.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an illustrative perspective view of a note PC, which is an example of information technology equipments to which the present invention is applied;

FIG. 2 is an illustrative plan view of a shield structure of the note PC shown in FIG. 1 viewed from a bottom side;

FIG. 3 is an illustration showing a positional relationship between memory modules, the shield structure and a lid;

FIG. 4 is an illustration showing a state where the lid is attached to the opening part;

FIG. 5 is an illustrative perspective view of a housing of a note PC according to a first embodiment of the present invention;

FIG. 6 is an illustrative plan view of the shield structure in FIG. 5 viewed from a bottom side;

FIG. 7 is an illustrative cross-sectional view showing a state where a lid is attached to an opening part;

FIG. 8 is a perspective view of the lid viewed from above;

FIG. 9 is a perspective view of the lid viewed from a backside;

FIG. 10 is an exploded perspective view showing a variation of the lid;

FIG. 11 is an illustrative cross-sectional view of a shield structure of a note PC according to a second embodiment of the present invention;

FIG. 12 is an illustrative plan view of the shield structure viewed from a bottom side;

FIG. 13 is a cross-sectional view showing a state where the lid is attached to an opening part of the shield structure;

FIG. 14 is an illustrative cross-sectional view of the shield structure taken along an extending direction of a rib provided in the opening part;

FIG. 15 is an illustrative cross-sectional view of a shield structure of a note PC according to a third embodiment of the present invention;

FIG. 16 is an illustrative plan view of the shield structure viewed from a bottom side;

FIG. 17 is a cross-sectional view showing a state where a lid is attached to an opening part of the shield structure;

FIG. 18 is an illustrative cross-sectional view taken along an extending direction of a rib provided to the opening part;

FIG. 19 is an illustrative cross-sectional view of a shield structure of a note PC according to a fourth embodiment of the present invention;

FIG. 20 is an illustrative plan view of the shield structure viewed from above;

FIG. 21 is an illustrative cross-sectional view showing a state where a lid is attached to an opening part of the shield structure;

FIG. 22 is an illustrative cross-sectional view of the shield structure taken along an extending direction of an electrically conductive material provided between connectors;

FIG. 23 is a graph showing results of measurements of interference waves for an existing note PC; and

FIG. 24 is a graph showing results of measurements of interference waves for a note PC taking shielding effect improving countermeasures according to the present invention.

Claims

1. A shield structure for information technology equipments, comprising: a signal ground line provided on a printed circuit board accommodated in the enclosure for information technology equipments;an opening part provided in a portion of said shield structure for information technology equipments;a lid covering the opening part; andan electric connection material extending between said lid and said signal ground line of said printed circuit board and having at least a surface formed by an electrically conductive material,wherein said electric connection material is in contact with said signal ground line of said printed circuit board.

2. The shield structure for information technology equipments as claimed in claim 1, wherein two connectors are mounted on said printed circuit board close to each other so that two memory modules are connectable to the connectors, respectively, and said opening part is provided at a position corresponding to a position where the memory modules are connected to the connectors.

3. The shield structure for information technology equipments as claimed in claim 1, wherein said signal ground line is provided on a signal wiring formed between said two connectors, and said electric connection material extends between said two connectors.

4. The shield structure for information technology equipments as claimed in claim 3, wherein at least one protruding tab is formed on one side of said lid so as to be inserted into an engaging part of said shield structure for information technology equipments, said electric connection material extends in a direction of insertion of said protruding tab, and said connectors on said printed circuit board extend in the direction of insertion.

5. The shield structure for information technology equipments as claimed in claim 3, wherein said electric connection material is a protruding part protruding on a backside of said lid and having at least a surface formed of an electrically conductive material.

6. The shield structure for information technology equipments as claimed in claim 5, wherein said lid has a structure in which a metal plate is applied to an entire backside including said protruding part.

7. The shield structure for information technology equipments as claimed in claim 5, wherein said lid has a structure in which conductive plating is applied onto an entire backside including said protruding part.

8. The shield structure for information technology equipments as claimed in claim 5, wherein only a part of said protruding part of said lid is in contact with said signal ground line.

9. The shield structure for information technology equipments as claimed in claim 3, wherein said electric connection material is a reinforcing material crossing said opening part of said shield structure for information technology equipments and having at least a surface formed of an electrically conductive material.

10. The shield structure for information technology equipments as claimed in claim 9, wherein said reinforcing material extends between said two connectors, and one end of said reinforcing material is in contact with said signal ground line on said printed circuit board.

11. The shield structure for information technology equipments as claimed in claim 10, wherein only a part of said reinforcing material is in contact with said signal ground line.

12. The shield structure for information technology equipments as claimed in claim 9, wherein said reinforcing material extends between said two connectors, and an electrically conductive elastic material is provided between said reinforcing material and said signal ground line on said printed circuit board.

13. The shield structure for information technology equipments as claimed in claim 12, wherein said electrically conductive elastic material is an electrically conductive gasket.

14. The shield structure for information technology equipments as claimed in claim 12, wherein said electrically conductive elastic material is a surface mount spring.

15. The shield structure for information technology equipments as claimed in claim 3, wherein said electric connection material is an electrically conductive material arranged between said two connectors and having at least a surface formed of an electrically conductive material, and opposite ends of said electric connection material are in contact with a backside of said lid and said signal ground line, respectively.

16. The shield structure for information technology equipments as claimed in claim 15, wherein said electrically conductive material is elastically deformable between said lid and said signal ground line.

17. The shield structure for information technology equipments as claimed in claim 3, wherein said signal ground line is an electrically conductive sheet material applied on an insulation film applied on said signal wiring formed on said printed circuit board between said two connectors, and the electrically conductive sheet material is electrically connected to a ground potential portion of said printed circuit board.

18. The shield structure for information technology equipments as claimed in claim 17, wherein said electrically conductive sheet material is a copper sheet.