Koninklijke Philips Corporation N.V.

Willem Johannes Van Den Bogert

Pieter C Ooms

Josephus Theodorus Van Der Eyden

Ronald Arjan Van Den Brakel

Suzanne Van Egmond

Johannes Theodorus Jacobus Van Haastrecht

Hindrik Hermannus Stel

Jeroen Jan Wits

Cornelis De Putter

Fluorescent lamp () having a glass discharge vessel () in which a gas is present, which discharge vessel () is provided with a tubular end portion () having a longitudinal axis, which end portion () includes a glass stem (), wherein an exhaust tube () extends axially outward from said stem () for supplying and/or discharging gases during the production of the lamp (), wherein an electrode () extends axially inward through the stem () for maintaining a discharge in the discharge vessel (), wherein the inwardly disposed end () of the electrode () is radially surrounded by a shield () for intercepting material emitted by the electrode (), which shield () is mounted on an elongate support () which extends inward from the stem (), and wherein said support () extends outward through the stem () into the exhaust tube ().

Fluorescent lamp and method of manufacturing same

A low-pressure mercury vapor discharge lamp is provided with a discharge vessel ( ). The discharge vessel comprises tubular end portions ( &prime;), which each have a longitudinal axis ( &prime;). The discharge vessel ( ) encloses a discharge space ( ) containing a filling of mercury and an inert gas in a gastight manner. Electrodes ( &prime;) are arranged in the discharge space ( ). An auxiliary amalgam is provided on a carrier ( &prime;) in the proximity of the electrodes ( &prime;). According to the invention, a part of the carrier ( &prime;) is arranged in a plane transverse to the longitudinal axis ( &prime;). Preferably, a stem ( &prime;) in the tubular end portion ( &prime;) carries, apart from the electrode ( &prime;), a support in the form of a wire ( &prime;) or an extended exhaust tube, which support carries the carrier ( &prime;). In an alternative embodiment, the carrier is clamped directly onto the stem. Preferably, the carrier ( &prime;) is electrically insulated with respect to the electrode. Preferably, a distance d between the carrier ( &prime;) and the electrode ( &prime;) lies in the range 1&lE;d&lE;3 mm. According to the invention, the discharge lamp has a relatively short run-up time.

Low-pressure mercury vapor discharge lamp with improved auxiliary amalgam

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Eindhoven, Netherlands

Willem Johannes Van Den Bogert