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Electronic apparatus and printed wiring board

Inactive Publication Date: 2010-03-11
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]For the above reasons, the printed wiring boards cannot sufficiently satisfy th

Problems solved by technology

However, the above donut-shaped lands raise a problem that the mounting area on the printed wiring board is reduced by areas corresponding to the spaces for formation of the lands.
However, in the printed wiring boards, the fixing holes cannot be located sufficiently close to the outer periphery because margins for formation of the donut-shaped lands need to be secured around the respective fixing holes.
Furthermore, since the lands are reduced in strength, the land patterns are prone to peel off when bolting is performed through the fixing holes.
For the above reasons, the printed wiring boards cannot sufficiently satisfy the recent requirements of high-density mounting and securing of a wider mounting area.

Method used

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  • Electronic apparatus and printed wiring board
  • Electronic apparatus and printed wiring board
  • Electronic apparatus and printed wiring board

Examples

Experimental program
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Effect test

first embodiment

[0024]An electronic apparatus will be described below with reference to FIGS. 1 to 4. As shown in FIG. 1, a portable computer as an example electronic apparatus is a so-called notebook personal computer. A description will be made with a notation that the forward direction and the backward direction are denoted by arrows F and R, respectively.

[0025]As shown in FIG. 1, the portable computer 11 is equipped with a main body unit 12, a display unit 13, and hinge mechanisms 14 which connect the main body unit 12 and the display unit 13. Supporting the display unit 13, the hinge mechanisms 14 make it possible to rotate the display unit 13 with respect to the main body unit 12. The display unit 13 has a display 15 and a cover 16 surrounding the display 15. The display 15 is a liquid crystal display, for example.

[0026]The main body unit 12 has a casing 21 made of a synthetic resin, a keyboard 22, a touch pad 23 which is a pointing device, and buttons 24. As shown in FIGS. 2 and 4, the main...

third embodiment

[0045]The printed wiring board 71 of the portable computer 11 has a substrate 33 and the land 72 which is formed on the substrate 33. The substrate 33 has, on its top surface, a pair of first regions 44 which extend along edges 35 so as to assume band shapes. The land 72 is formed around (in the vicinity of) the opening of a fixing hole 36. The land 72 extends outward from the fixing hole 36 in a range that is defined between a direction D1 going from the fixing hole 36 toward a central portion 45 of the substrate 33 and directions D2 that are along the edges 35. The land 72 is disposed outside the first regions 44 or a second region 73 that is located between the fixing hole 36 and the central portion 45. More specifically, the land 72 extends outward from the fixing hole 36 in two directions that are along the edges 35 so as to generally assume an L shape as a whole. The land 72 is continuous with a plating member 37.

[0046]In the third embodiment, the land 72 is disposed outside ...

fifth embodiment

[0054] even in the hard disk drive 91 which is an example electronic apparatus, the fixing hole 36 can be located as close to the edges 35 as possible and hence a wide mounting area can be secured on the printed wiring board 51. This makes it possible to cope with the miniaturization of the printed wiring board 51 flexibly and to thereby miniaturize the hard disk drive 91 as a whole.

[0055]Although the printed wiring board 51 of the fifth embodiment is similar to that of the second embodiment, this aspect of the invention is not limited to such a case. That is, a printed wiring board similar to the printed wiring board of the first, third, or fourth embodiment may be used.

[0056]The electronic apparatus according to the invention is not limited to portable computers and hard disk drives, and the invention can also be applied to other kinds of electronic apparatus such as a cell phone. Other various modifications can be made of the above-described electronic apparatus without departing...

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PUM

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Abstract

According to an aspect of the present invention, there is provided a printed wiring board including: a substrate including an edge and a fixing hole located adjacent to the edge, the fixing hole configured to receive a bolt; and a land formed in a vicinity of the fixing hole and extending in at least a first direction and a second direction, the first direction being a direction from the fixing hole toward a center of the substrate, the second direction being direction along the edge.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2008-232390, filed on Sep. 10, 2008, the entire contents of which are incorporated herein by reference.BACKGROUND[0002]1. Field[0003]An aspect of the present invention relates to a printed wiring board having lands and an electronic apparatus equipped with it.[0004]2. Description of the Related Art[0005]For example, a printed wiring board is disclosed in which lands for grounding are disposed around fixing holes for bolting of the printed wiring board. This printed wiring board is equipped with a substrate, the fixing holes which penetrate through the substrate, the lands which are donut-shaped and are formed around the respective fixing holes on the surface of the substrate, and cream solder members which are printed on the surfaces of the lands.[0006]In printed wiring boards of this type, usually, the surfaces of the lands are subjecte...

Claims

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Application Information

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IPC IPC(8): H05K5/00H05K1/00
CPCH05K1/0215H05K1/116H05K3/325H05K7/142H05K5/0247H05K2201/09463H05K2201/10409H05K1/02H05K9/0064
Inventor HASEGAWA, KENJIKOZAI, TSUYOSHIKANOU, TERUNARI
Owner KK TOSHIBA