Low pressure discharge lamp with envelope having double...

Details Low pressure discharge lamp with envelope having double... Low pressure discharge lamp with envelope having double...

2011-04-19

2011-04-19

Roy, Sikha (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

C313S609000, C313S634000, C313S611000, C445S026000

Reexamination Certificate

active

07928644

ABSTRACT:
A low pressure discharge lamp with a double helix shape comprises a lamp base and an envelope connected to the lamp base. The envelope has a phosphor coating on an interior surface thereof, and contains a gas fill energizable to a discharge state by electrical voltage. The envelope includes discharge tube sections which are wound about a longitudinal axis and fitted into each other as a double-start thread. The discharge tube sections have first end portions and second end portions. The first end portions are closer to the lamp base and each have a gas-tight sealing and electrodes in the sealing for receiving the electric voltage. The second end portions are farther off the lamp base and each have a gas-tight sealing. These second end portions are bent inwards from a pitch of the helix and extend next to each other spaced apart by a clearance. A passage is formed between said second end portions. The passage is spaced apart by a distance from the sealing of each said second end portion.

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