Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
1999-05-11
2001-02-27
Young, Lee (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S854000, C029S825000, C029S743000, C029S592100, C294S064200
Reexamination Certificate
active
06192574
ABSTRACT:
FIELD OF INVENTION
The present invention relates to a method of manufacturing a coil and attaching the thus manufactured coil to the contact points of an electric circuit. The invention also relates to apparatus for carrying out the method.
More specifically, the invention relates to the manufacture of electric components of very small dimensions, and in particular components that include a coil which is connected to one or more electronic circuits or to one or more chips or integrated circuits, printed circuits or like electronic elements. Reference to electric circuits in the following will be understood to include one or more kinds of the aforesaid elements on each mentioning occasion.
DESCRIPTION OF THE BACKGROUND ART
Certain problems arise in the manufacture of components of the aforedescribed nature. These problems are essentially caused by the very small dimensions of the elements concerned and require manufacturing precision. Typical dimensions of electronic circuits of the kind in question are in the order of 0.9×0.9×0.4 mm and such a circuit will typically weigh 4 mg. The copper filament used in winding the coil has a typical diameter of 0.03 mm including insulation.
In manufacturing such a component, it has earlier been necessary to pre-attach, e.g., a chip to a tool and then wind a coil with the aid of a so-called flyer with one end of the copper filament affixed to a contact point on the chip, and thereafter affix the other end of the copper filament across the next contact point and therewith establish contact across the whole of the circuit, upon completion of the coil winding process. One such method of procedure is described in European Patent Specification 0573469.
A coil that has been manufactured in this traditional manner will have a very non-uniform quality, because the filament, or wire, is taken from an external source and placed adjacent the bobbin centre, which initially has a given shape (thickness), and is wound initially from within and outwards. Consequently, fewer layers of copper filament are obtained where the first end of the filament has passed in towards the centre of the coil and winding has commenced. As a result, the coil will be wider in this region in order to obtain the same number of turns. The corresponding side of the coil then receives more layers and will thus be thicker.
An object of the present invention is to make possible the manufacture of a coil of greater and more uniform quality, by coiling the filament instead of winding the filament with the aid of a flyer, whereby the electronic circuit or circuits is/are kept outside the actual coiling procedure. This more uniform quality is achieved by placing the filament in the centre from the very beginning and then coiling the filament outwards in the tool.
Another object of the invention is to place the chip, etc., in the coil centre hole directly, thereby avoiding the need to fold-in the chip manually.
A further object of the invention is to enable copper filament and chip to be held in place with the aid of sub-pressure, which has been found to be a much simpler and much cheaper solution than the mechanical holders that are otherwise usual.
SUMMARY OF THE INVENTION
A method of manufacturing a coil and attaching the manufactured coil to the contact points of an electric circuit, wherein one end of a winding filament is brought in a stretched state to a predetermined first position in a winding machine; wherein the winding filament is wound to form a coil in the winding machine while maintaining said filament end at said first position inwardly of the coil; wherein the end of the winding filament after the coil is brought in a stretched state to a predetermined second position in the winding machine, also inwardly of the coil, and the filament then cut; wherein a circuit fixture or jig coacting with the winding machine and having an electric circuit inlaid in a predetermined third position that corresponds to said first and said second positions in the winding machine is brought into contact with the winding machine to collect the wound coil; and wherein the filament ends of the coil are finally welded together with the contact points on the electric circuit located inwardly of the coil.
These and other characteristic features of the inventive method and the inventive apparatus for carrying out the method will be evident as set forth herein.
REFERENCES:
patent: 3641648 (1972-02-01), Kalberman
patent: 4712784 (1987-12-01), Carrell
patent: 4785527 (1988-11-01), Bernard et al.
patent: 4860433 (1989-08-01), Miura
patent: 5118153 (1992-06-01), Allison et al.
patent: 5634261 (1997-06-01), Gustafson
patent: 5926944 (1999-07-01), Smith et al.
patent: 8503166 (1987-06-01), None
patent: 93/09551 (1993-05-01), None
Jacobson Price Holman & Stern PLLC
Metget AB
Trinh Minh
Young Lee
LandOfFree
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