Multi-use lamp vessel and an incandescent lamp
AssigneeU.S. Philips Corporation
InventorPetrus A. J. Holten
Life of this patent
Estimating the term…
Abstract
The electric incandescent lamp has a multi-use lamp vessel having a neck-shaped wall portion, a wall portion which is curved in accordance with a first circuit arc and extends substantially in the transverse direction, and a wall portion which is curved in accordance with a second circular arc and extends substantially in the axial direction. A filament is arranged in the proximity of the largest diameter. The electric incandescent lamp has the advantage that, independent of its finish it has a lamp vessel of the same shape and the same mounting means for the filament. The manufacture of incandescent lamps of different types is thereby simplified considerably.
Claims12
A multi-use symmetrical lamp envelope, comprising:
- (a) a neck-shaped first portion;
- (b) an internally concave second portion extending outwardly from said neck shaped portion and terminating at the largest diameter of said lamp envelope, said second portion extending more in a direction transverse to the axis of symmetry of said envelope than along said axis, said second portion being a body of revolution of a first circular arc about said axis of symmetry, said axis of symmetry being between the center of curvature of said first circular arc and said first circular arc, said center of curvature of said first circular arc being in a region which extends from said largest diameter away from said second portion;
- (c) an internally concave third portion smoothly merging with said second portion at said largest diameter and extending away from said largest diameter more along said axis of symmetry than transverse to said axis of symmetry, said third portion being a body of revolution of a second circular arc about said axis of symmetry, said axis of symmetry lying between the center of curvature of said second circular arc and said second circular arc, said center of curvature of said second circular arc lying in a region which extends from the largest diameter towards said neck-shaped portion;
- and
- (d) an internally concave fourth wall portion opposite said first and second portions joining said third portion.
A lamp envelope as claimed 2, wherein said third portion and said fourth portion have a mirror coating.
An incandescent lamp, comprising:
- (a) a symmetrical lamp envelope comprising
- a neck shaped first portion,
- an internally concave second portion extending outwardly from said neck shaped portion and terminating at the largest diameter of said lamp envelope, said second portion extending more in a direction transverse to the axis of symmetry of said envelope than along said axis, said second portion being a body of revolution of a first circular arc about said axis of symmetry, said axis of symmetry being between the center of curvature of said first circular arc and said first circular arc, said center of curvature of said first circular arc lying in a region which extends from said largest diameter away from said second portion,
- an internally concave third portion smoothly merging with said second portion at said largest diameter and extending away from said largest diameter more along said axis of symmetry than transverse to said axis of symmetry, said third portion being a body of revolution of a second circular arc about said axis of symmetry, said axis of symmetry lying between the center of curvature of said second circular arc and said second circular arc, said center of curvature of said second circular arc being in a region which extends from the largest diameter towards said neck-shaped portion, and
- an internally concave fourth wall portion opposite said first and second portions joining said third portion;
- (b) a lamp base secured on said neck portion;
- (c) a filament energizable for emitting light;
- and
- (d) means for supporting said filament within said lamp envelope with a portion of said filament proximate said largest diameter.
An incandescent lamp as claimed 9, wherein said third portion and said fourth portion have a mirror coating.
Dependencies are inferred from the claim text.