Case, portable information equipment using the same and manufacturing method of the case

Abstract

The case disclosed has a raised portion stepped upward convexly and a rib molded inside of the raised portions integrally. The case is disposed at a rear surface of a display unit of a portable information equipment.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A shows an outward perspective view of a portable information equipment according to an exemplary embodiment of the present invention.

FIG. 1B shows an outward perspective view from the rear side of the portable information equipment shown in FIG. 1A.

FIG. 1C is a block diagram showing the configuration of the portable information equipment according to the exemplary embodiment of the present invention.

FIG. 2A shows a cross-sectional view of the display unit taken along the line 2A-2A of the portable information equipment shown in FIG. 1B.

FIG. 2B shows a cross-sectional view of the display unit taken along the line 2B-2B of the portable information equipment shown in FIG. 1B.

FIG. 3 shows a perspective plan view of a rear case of the display unit of the portable information equipment shown in FIG. 1B.

FIG.4A shows a cross-sectional view of the display unit shown in FIG. 2A when applied a high pressure from outside.

FIG.4B shows a cross-sectional view of the display unit shown in FIG. 2B when applied a high pressure from outside.

FIGS. 5A and 5B illustrate a reject phenomena called a “shrink mark” that occurs in mold-manufacturing.

FIG. 6A shows a cross-sectional view of an essential part of a mold to form the rear case shown in FIG. 2A.

FIGS. 6B to 6D illustrate cross-sectional views of an essential part of the mold shown in FIG. 2A to explain the manufacturing of the rear case.

FIG. 7A shows an outward perspective view of a conventional portable information equipment in a state that a display unit is opened.

FIG. 7B shows an outward perspective view of the portable information equipment shown in FIG. 7A in a state that the display unit is closed.

FIG. 8A shows a cross-sectional view of the display unit taken along the line 8A-8A in FIG. 7B.

FIG. 8B shows a cross-sectional view of the display unit taken along the line 8B-8B in FIG. 7B.

Claims

1. A case disposed at a rear surface of a display unit of a portable information equipment, the case comprising: a raised portion stepped upward convexly; anda rib molded inside of the raised portion integrally.

2. The case according to claim 1, wherein the rib is one of a plurality of ribs and a plurality of the ribs are molded inside of the raised portion integrally.

3. The case according to claim 2, wherein the case is formed substantially in an outward shape of a rectangular solid and a plurality of the ribs are disposed substantially in a direction parallel with an edge of an outer surface of the case.

4. The case according to claim 3, wherein a clearance between the ribs become smaller as apart farther from a center of the case.

5. The case according to claim 3, wherein a protrusion height of each of a plurality of the ribs becomes lower as nearer to a center of the case.

6. The case according to claim 1, wherein a protrusion height of the rib becomes lower as nearer to a center of the case.

7. A portable information equipment comprising: A) a processing section;B) an input section connected to the processing section; andC) a display unit connected to the processing section having; C-1) a display panel; andC-2) a case disposed on a rear surface of the display panel including; C-2-1) a raised portion stepped upward convexly; andC-2-2) a rib molded inside of the raised portion integrally.

8. A manufacturing method of a case comprising: melting a material;pouring the molten material between an upper mold half and a lower mold half, andremoving the upper mold half and the lower mold half after the molten material is cooled down to solidify,wherein the lower mold half is provided with a first step to form a raised portion on the molded case and a groove to form a rib nearer to a center side from the first step, and the upper mold half is provided with a second step to form the raised portion.

9. The manufacturing method according to claim 8, wherein the upper mold half is provided with a cavity to form a mound containing beforehand an amount of molding material equal to a volume loss due to a shrink mark, the cavity is provided at a position on the rear surface of corresponding the groove on the lower mold half to form a rib.