Active solid-state devices (e.g. – transistors – solid-state diode – Test or calibration structure
Reexamination Certificate
1996-04-25
2001-07-31
Graybill, David E. (Department: 2814)
Active solid-state devices (e.g., transistors, solid-state diode
Test or calibration structure
C257S773000, C257S786000
Reexamination Certificate
active
06268616
ABSTRACT:
TECHNOLOGICAL FIELD
This invention relates to an electrical wiring board used in electronic products and a method for identifying the same.
RELATED ART
Conventionally, electrical wiring boards and completed printed circuit boards comprising of electrical wiring boards with electronic components mounted thereon have been manufactured in correspondence with individual final products in which they are to be used. However, in recent years, to promote standardization and common use of parts, redundancy design of electrical wiring boards has been being carried out and electrical wiring boards having the same specification have been being used to make a plurality of different completed printed circuit boards by mounting different components on them. For example, in the case of completed printed circuit boards used for liquid crystal display devices, making just the type of signal inputted into the liquid crystal display device different, making just whether or not there is a buffer in a wave test different or making just connectors different have been tried.
OBJECT OF THE INVENTION
However, when electrical wiring boards having the same specifications have been used with different components mounted thereon as a plurality of different completed printed circuit boards, because the electrical wiring boards have the same specifications they look almost the same and it has been difficult for assembly workers to identify which final product a completed printed circuit board is for.
That is, when the electrical wiring boards of different completed printed circuit boards have the same specifications it is almost impossible to distinguish them by their outline shape or size and consequently the only way of identifying the completed printed circuit boards has been by differences in the components mounted on the electrical wiring boards. However, because these mounted components are extremely small, the probability of making an incorrect identification has been high.
Because of this, conventionally, as a method for identifying completed printed circuit boards, as shown in
FIG. 4
, a product name (in the case shown in
FIG. 4
, ‘NBP28-3133-112’) has been displayed on the surface of an electrical wiring board
100
with silk screen printing
102
. As for other methods, for example marking
106
with black ink of a mounted component
104
such as a connector has been carrier out or silk screen printing on a mounted component
104
in a color such as white or yellow has been carried out to identify the product by this color.
However, printing a product name in silk screen print
102
is troublesome and costly. Also, when marking
106
has been carried out on a mounted component
104
it has sometimes happened that this marking has disappeared in the course of the manufacturing process of the product. Furthermore, in the case of identification by changing the color of silk screen printing, because the specifications of the electrical wiring board increase there have been problems such as that to control completed printed circuit boards to high quality is not possible and that manufacturing costs increase.
In this connection, in view of the problem points mentioned above, an object of the present invention is to provide an electrical wiring board and method of identifying the same with which even when a plurality of different completed printed circuit boards are assembled from electrical wiring boards having the same specifications it is possible to identify the type of a completed printed circuit board easily.
SUMMARY OF THE INVENTION
A first aspect of the invention provides an electrical wiring board capable of using for a plurality of different completed printed circuit boards comprising a connecting conductor pattern disposed on a board for making possible connections between components, which comprises a plurality of lands being disposed on a surface of the electrical wiring board for identifying the specification of the completed printed circuit boards.
An electrical wiring board according to this first aspect of the invention is provided with a plurality of lands for identification respectively corresponding to each of a plurality of completed printed circuit boards. By applying an adhesive to one land for identification among these lands for identification which corresponds to the final product in which the completed printed circuit board is to be used, the type of the completed printed circuit board can be identified easily.
A second aspect of the invention provides an electrical wiring board according to claim
1
, further comprising a solder selectively disposed onto at least one of the lands, corresponding to said specification.
A third aspect of the invention provides an electrical wiring board according to the first aspect of the invention wherein the lands for identification are electrically connected to the connecting conductor pattern so that they can be used for inspection of the electrical wiring board.
With an electrical wiring board according to this third aspect, because the lands for identification are electrically connected to the connecting conductor pattern making inspection possible, it is not necessary to provide special lands for identification.
A fourth aspect of the invention provides an electrical wiring board according to the first aspect wherein the plurality of lands for identification are arrayed in a line.
With an electrical wiring board according to the fourth aspect of the invention, because the lands for identification are arrayed in a line, identification is easy.
A fifth aspect of the invention provides an electrical wiring board made from glass cloth, paper board, epoxy resin or coppered laminated sheet on which components can be mounted to make any of a plurality of different completed printed circuit boards, comprising a plurality of lands for identification respectively corresponding to each of the plurality of completed printed circuit boards.
An electrical wiring board according to the fifth aspect of the invention is provided with a plurality of lands for identification respectively corresponding to each of a plurality of completed printed circuit boards. By applying solder to one land for identification among these lands for identification which corresponds to the final product in which the completed printed circuit board is to be used, the type of the completed printed circuit board can be identified easily.
A sixth aspect of the invention provides an electrical wiring board according to the fifth aspect of the invention wherein the lands for identification also serve as pads for testing.
With an electrical wiring board according to the sixth aspect of the invention, by using the lands for identification as pads for testing, it is not necessary to provide special lands for identification.
A seventh aspect of the invention provides an electrical wiring board according to the fifth aspect of the invention wherein the plurality of lands for identification are arrayed in a line.
With an electrical wiring board according to the seventh aspect of the invention, because the lands for identification are arrayed in a line, identification is easy.
An eighth aspect of the invention provides a method for manufacturing completed printed circuit boards having a plurality of specification using electrical wiring boards having one specification, wherein each electrical wiring board includes a plurality of lands, and solder is applied onto at least one of the land corresponding to each specification of the completed printed circuit board, wherein the completed printed circuit boards of one of the specification are distinguishable from the other by the presence or absence of the solder on each of the lands.
A ninth aspect of the invention provides a method for manufacturing completed printed circuit boards according to claim
8
, wherein the lands also serve as pads for testing the electrical wiring boards.
A tenth aspect of the invention provides a method for manufacturing completed printed circuit boards according to claim
8
, wherein the lands also serve as pads
Graybill David E.
Kabushiki Kaisha Toshiba
Pillsbury & Winthrop LLP
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