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US 4,180,755 AGranted
Sealed beam lamp including filament locating means
AssigneeCorning Glass Works
InventorRoy A. Nixon, Jr.
Life of this patent
Estimating the term…
Abstract
In a sealed beam incandescent lamp a generally concave reflector member is provided with three or more bosses having flat outer surfaces. The surfaces define a plane perpendicular to the axis of the parabola so that specific points within the parabola can be located with great precision. By using the bosses as reference points, lamp filaments can be accurately placed within the lamp structure, regardless of variations in the reflector member which occur during the manufacturing process.
Claims6
A sealed beam incandescent lamp, comprising:
- a lens member for refracting a beam of light emanating from within the lamp;
- a generally concave reflector member attached to said lens member to form a lamp envelope, said reflector member exhibiting a substantially parabolic transverse section;
- a filament assembly fixedly attached to said reflector member, and including a filament member disposed approximately in the latus rectum of the parabola;
- and
- at least three discrete bosses formed in the inner surface of said reflector member, said bosses defining a plane substantially perpendicular to the axis of said parabola such that said bosses enable the accurate mounting of the filament at the latus rectum of the lamp.
2 more elements
Dependencies are inferred from the claim text.