Electric lamp with inner assembly and outer bulb and method for manufacturing
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United States of America Patent
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Mar 29, 2011
Grant Date -
Feb 4, 2010
app pub date -
Jul 29, 2008
filing date -
Jul 29, 2008
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electric lamp comprises an inner assembly including a light source and a control gear circuit. An outer envelope encloses the light source and at least a part of the control gear and has a predetermined wall thickness and an end portion. The outer envelope is comprised of two parts separated along a circumferential line. The two parts of the envelope are connectable and sealable to form a uniform outer envelope with a seal region. The seal region has a wall thickness and is merged in a surface portion of the two parts of the envelope so that the surface unevenness of the seal region is not greater than 0.5 millimeters, and the maximum difference of the wall thickness of the seal region with respect to the wall thickness of the outer envelope is not greater than 0.3 millimeters.
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