Electric-light bulb
OwnerNagafumi Tsukadainventor
Life of this patent
Estimating the term…
Abstract
The electric-light bulb is capable of limiting an inrush current and automatically periodically changing brightness. In the electric-light bulb, a filament is provided in a bulb body. A resistance is provided in the bulb body and connected to the filament in series. A thermoswitch is provided in the bulb body and connected to the resistance in parallel. The thermoswitch includes a bimetal element and contact points. The bimetal element is deformed by heat radiated from the filament and closes the contact points when temperature of the bimetal element reaches prescribed temperature so as to short the resistance.
Claims2
An electric-light bulb, comprising:
- a bulb body;
- a filament being provided in said bulb body;
- a resistance being provided in said bulb body, said resistance being connected to said filament in series;
- a first thermoswitch being provided in said bulb body, said first thermoswitch being connected to said resistance in parallel, said first thermoswitch including a first bimetal element and first contact points;
- and
- a second thermoswitch being provided in said bulb body, said second thermoswitch being connected to said resistance in series, said second thermoswitch including a second bimetal element and second contact points,
- wherein said first bimetal element and said second bimetal element are deformed by heat radiated from said filament, so that said first contact points are firstly opened so as to reduce an electric current passing through said filament by said resistance, then said second contact points are opened so as to stop the electric current passing through said filament, and
- wherein said first bimetal element and said second bimetal element return to initial states, so that said first contact points are firstly reclosed, then said second contact points are reclosed.
An electric-light bulb, comprising:
- a bulb body;
- a filament being provided in said bulb body;
- a resistance being provided in said bulb body, said resistance being connected to said filament in series;
- a first thermoswitch being provided in said bulb body, said first thermoswitch being connected to said resistance in parallel, said first thermoswitch including a first bimetal element and first contact points;
- and
- a second thermoswitch being provided in said bulb body, said second thermoswitch being connected to said resistance in series, said second thermoswitch including a second bimetal element and second contact points,
- wherein said first bimetal element and said second bimetal element are deformed by heat radiated from said filament, so that said first contact points are firstly closed so as to short said resistance and increase an electric current passing through said filament, then said second contact points are opened so as to stop the electric current passing through said filament, and
- wherein said first bimetal element and said second bimetal element return to initial states, so that said first contact points are firstly reopened, then said second contact points are reclosed.
Dependencies are inferred from the claim text.