| 摘要 |
An electric ballast (1) is provided with an electric coil with windings having a width (d) which are wound on a synthetic resin coil base (10) comprising a box-like base part (11) of rectangular shape having four faces (111, 112, 113, 114). The base part is suited to accommodate an iron core of the coil. The base part is provided on either side with mutually parallel flanges (121, 122) which define the width (d). According to the invention, the coil is provided with a separate, insulating synthetic resin cover which is in one piece and which, in cooperation with the coil base, encloses the coil windings.
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