Discharge lamps
AssigneeThorn EMI plc
InventorsRobert Hall, Thomas S. Ainsworth
Life of this patent
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Abstract
The invention relates to a single ended discharge lamp, such as a CID or CSI lamp having a bi-pin base. The base is such as to fit a socket suitable for lamps such as tungsten halogen filament lamps for which lower voltages are used and is adapted to make use in such sockets possible. The base or cap member is provided in the usual manner with two pins but at least one of the pins is a dummy pin. At least one extra terminal is disposed to the side of the base whereby electrical connection to one electrode of the lamp is by a flying lead. The other terminal may be the other pin or may be disposed at the other side of the base. In that event both pins may be electrically disconnected from the electrodes and serve only for support or positioning of the lamp.
Claims7
A single ended discharge lamp, such as a CID or CIS lamp, having two discharge electrodes mounted in a discharge enevelope and electrically connected by respective leads to respective terminals in a cap member of insulating material supporting the envelope and having two pin members disposed in side-by-side relationship protruding from the base of the cap member, wherein at least one of the pin members is a dummy pin and at least one of said terminals is disposed at one side of the cap member, said lamp further comprising insulation in said cap member provided between the two terminals and between at least one of the terminals and the dummy pin or pins.
Dependencies are inferred from the claim text.