Low-pressure mercury vapor discharge lamp with amalgam capsule having amalgam chamber
AssigneeKoninklijke Philips Electronics N.V.
InventorsBrett Carter, Ronald Huijben
Life of this patent
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Abstract
An amalgam capsule (16) for a low-pressure mercury vapor discharge lamp (1) has a closed end and an opposing end with an opening (21) to allow passage of mercury vapor between the amalgam plug (18) and the discharge space (3) of the lamp (1). A glass rod (19) placed in the capsule (16) restrains movement of the amalgam plug (18), and projections (20) in the inner wall of the capsule (16) restrain movement of the glass rod (19). The presence of the amalgam capsule (16) in the discharge space (3) enables highly-loaded, substantially temperature-independent operation of linear fluorescent lamps such as T8 lamps.
Claims22
A low-pressure mercury vapor discharge lamp (1) comprising a glass vessel (2) enclosing a discharge space (3), the glass vessel (2) provided with at least one glass stem (13) located within an end portion of the glass vessel (2), and also comprising a container (16) encapsulating at least one plug (18) of amalgam, the container (16) being provided with an opening (21) enabling gas exchange between the amalgam plug (18) and the discharge space (3), the container (16) also being provided with at least one spacer (19) located between the amalgam plug (18) and the opening (21), to restrain movement of the amalgam plug (18) within the container (16), the lamp (1) being characterized in that the container (16) also includes means (20) for restraining the movement of the spacer (19) within the container (16).
An amalgam container (16) for a low-pressure mercury vapor discharge lamp (1), the container (16) encapsulating at least one amalgam plug (18), the container (16) being provided with an opening (21) enabling gas exchange between the amalgam plug (18) and the discharge space (3) of the lamp (1), the container (16) also being provided with at least one spacer (19) located between the amalgam plug (18) and the opening (21), to restrain movement of the amalgam plug (18) within the container (16), characterized in that the container (16) also includes means (20) for restraining the movement of the spacer (19) within the container (16).
Dependencies are inferred from the claim text.