Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
1999-07-26
2001-10-09
Gaffin, Jeffrey (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C174S034000, C174S051000, C439S943000, C361S816000
Reexamination Certificate
active
06301125
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a unit with shield, and more particularly to a unit with shield having a shield plate covering a sub-circuit board to be inserted and mounted in a hole formed in a main circuit board.
2. Description of the Prior Art
Prior art of this kind is disclosed in a publication of Japanese Utility Model Laying-open No. 77400/1988 laid open to the public on May 23, 1988. This prior art is provided with terminals as mounting legs on a sub-circuit board covered by a shield plate in order to enable the sub-circuit board to be mounted onto a main circuit board.
In the prior art, however, there has been a problem of process complication in providing terminals on a sub-circuit board, resulting in an increase in manufacturing costs.
SUMMARY OF THE INVENTION
Therefore, it is a primary object of the present invention to provide a unit with a shield which is simple in structure but capable of inserting and fixing a sub-circuit board in a hole formed in a main circuit board.
A unit with shield according to the present invention has: a shield plate covering over a sub-circuit board to be inserted into a hole formed in a main circuit board; a first shield plate and a second shield plate which are engaged through the sub-circuit board to cover over respective main surfaces of the sub-circuit board; and a spring portion provided in a lower portion of the first shied plate and inserted into the hole.
As for main and back surface sides of the sub-circuit board, the first shield plate and the second shield plate are inserted in a hole formed in the lower portion of the main circuit board. Accordingly, the sub-circuit board is covered over and hence shielded by the first shield plate and second shield plate which are engaged with each other through the sub-circuit board.
According to the present invention, the sub-circuit board and the first and second shield plates (unit with shield) can be positively fixed on the main circuit board by merely inserting the spring portion in the hole formed in the main circuit board. Consequently, structure is simplified and cost is reduced as compared to the conventional.
The above spring portion includes a first spring and a second spring provided on respective surfaces of the lower portion of the first shield plate. Due to this, the spring portion provided in the lower portion of the first shield plate is inserted in the hole of the main circuit board, whereby the unit with shield, i.e. the sub-substrate and the first and second shield plates, is fixed on the main circuit board.
In one aspect of the present invention, the spring portion urges the sub-circuit board against one surface of the hole whereby a pattern formed on the sub-circuit board and a pattern formed on a backside of the main circuit board are brought into close contact with each other. It is therefore possible to positively solder between the patterns by dipping.
In another aspect of the present invention, because a removal preventing portion is provided in the lower portion of the first shield plate, the sub-circuit board, first shield plate and second shield plate are prevented from being removed from the main circuit
REFERENCES:
patent: 5353201 (1994-10-01), Maeda
patent: 5383098 (1995-01-01), Ma et al.
patent: 5946199 (1999-08-01), Matsuzaki
Bui Hung S.
Funai Electric Co. Ltd.
Gaffin Jeffrey
Lackenbach Siegel Marzullo Aronson & Greenspan P.C.
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