Electric incandescent lamp with sintered glass plate
AssigneeU.S. Philips Corporation
InventorsUrsula Bruggemann, Wilfried L. Kohlmann, Jacques M.J. Geboers, Antonius J.M. Van Hees
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Abstract
The electric incandescent lamp has a sintered glass plate (1) through which current conductors (2) and a metal tube (3) extend. An incandescent body (4) is connected to said current conductors (2) aligned with respect to the sintered plate (1). A glass bulb (5) is present over the incandescent body (4), gastight secured to the sintered plate (1) by means of enamel (6). A water getter (20) and a heavy gas at an elevated pressure are present inside the glass bulb (5). The lamp may consume a relatively high power and may be relatively small, but nevertheless has a relatively long life.
Claims13
An electric incandescent lamp comprising:
- a shaped glass plate (1) which is connected in a gastight manner to current conductors (2) and to a metal tube (3) which extend through said plate;
- an incandescent body (4) occupying a predetermined position relative to the shaped plate (1) and connected to the current conductors (2);
- a glass bulb (5) around the incandescent body (4), connected in a gastight manner to the shaped plate (1) by means of enamel (6);
- a filling gas having a pressure of at least 1 bar inside the bulb (5),
- said metal tube (3) having a gastight seal (30) outside the bulb (5),
- characterized in that the shaped plate (1) is a sintered body made of a first glass and the bulb (5) is made of a second glass, the first glass and the second glass have coefficients of linear thermal expansion which are substantially equal at temperatures below the strain point of the glasses.
Dependencies are inferred from the claim text.