Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With electromagnetic field
Reexamination Certificate
1999-05-26
2001-06-19
Snow, Walter E. (Department: 2862)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With electromagnetic field
C336S065000, C336S192000, C439S884000
Reexamination Certificate
active
06249116
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
The present application is based on and claims priority from Japanese Patent Applications Hei 10-161026 filed on Jun. 9, 1998, and Hei 10-180756 filed on Jun. 26, 1998, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a driving unit of a cross-coil type indicating instrument.
2. Description of the Related Art
JP-A-9-304430 discloses a driving unit of a cross-coil type indicating instrument which has a hollow bobbin with a pair of cross coils and a plurality of terminal holders disposed around the pair of cross coils. A male terminal is held in each of the terminal holders. The male terminal has an L-shaped edge portion extending in the terminal holder toward the cross coils and a rod portion extending axially downward.
Wire ends of the pair of cross coils are respectively wound around spool portions of the edge portions and soldered thereto before being bent. In the soldering step, melting solder flows from the spool portion downward along peripheries of the connection end to the portion that is bent thereafter.
If the solder flowing downward and becomes solid at the portion to be bent, it is difficult to bend the edge portion. This may also cause incomplete electrical connection of the terminals and the pair of cross-coils.
SUMMARY OF THE INVENTION
A main object of the invention is to provide an improved structure of a cross-coil type indicating instrument that makes the soldering process easier.
According to an aspect of the invention, each of the male terminals has a dam for holding melt-solder disposed between the spool portion and the bent portion. The dam can be a through hole, a projection, a tongue member, or a part of the wire end.
Another object of the invention is to provide an improved driving unit in which a printed circuit board and cross-coils can be assembled easily.
According to another aspect of the invention, a plurality of connectors are connected to the printed circuit board to be coupled with the plurality of male terminals. The connector is composed of an upper wall having an opening for receiving the male terminal, a plurality of legs engaged with the printed circuit board, and a pair of female terminal members engaged with the rod portion of the male terminal. At least one of the legs can have a stopper arm extending from a portion at the middle thereof for restricting distortion of the connector relative to the printed circuit board.
REFERENCES:
patent: 2953758 (1960-09-01), Stanwyck
patent: 3-182067 (1991-08-01), None
patent: 5-215779 (1993-08-01), None
patent: 9-304430 (1997-11-01), None
Miyagawa Isao
Yamada Ken'ichi
Denso Corporation
Pillsbury & Winthrop LLP
Snow Walter E.
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