Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh

Joachim Dassler

Klaus Kramer

Ingrid Liesch

Detlef Girod

To mount a discharge vessel (8) within an elongated bulb or envelope (2) le permitting thermal expansion of the discharge vessel (8) and yet maintaining the discharge vessel, free from vibration, within the tube in alignment with the longitudinal axis thereof, a flat leaf spring element (15, 15') (FIG. 2 ) is secured to a holder structure (5; 6a, 6b, 12) secured in the bulb and the respective electrode current connections (10a, 10b, 25a, 25b) to the discharge vessel, the flat leaf spring element being so located in the bulb that its major plane is oriented essentially perpendicularly to the longitudinal axis of the lamp. Preferably, the leaf spring element is an essentially flat plate, with at least one bent-over welding tab for connection to the connecting leads (6a, 6b) and cut with an essentially U-shaped punch cut to leave two outer stabilizing arms (19) and an inner part (18), which inner part is secured to the current connection from the arc tube such that the lever arm (h2) between the outer ends (20) of the two arms (19) and the longitudinal axis of the lamp is about half of the lever arm between the longitudinal axis of the lamp and the attachment of the spring element to a connecting lead (6a, 6b, 12).

High-pressure discharge lamp with support structure for discharge vessel

To retain an arc tube (6, 16) in precise position with respect to an opti system (R) within an outer envelope (2, 12), the arc tube is retained at both ends by spiral springs (23) which have a cylindrical portion fitted in a sleeve-like current supply (7, 17) to the arc tube and having a conically expanding portion (25), terminating in an end portion (26) which is welded to a central guide pin (27) fitted and movable within the cylindrical portion (24) of the spring. The guide pin (27) can form part of an internal current supply (FIG. 3: 19) or be secured to an internal current supply lead (FIGS. 1, 2: 9).

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Berlin, Germany

Joachim Dassler