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US 7,064,490 B2Granted
Compact self-ballasted electrodeless discharge lamp and electrodeless-discharge-lamp lighting device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKiyoshi Hashimotodani, Takeshi Arakawa, Akira Hochi, Koichi Katase, Yuuji Omata, Yoshihisa Hagiwara
Life of this patent
Estimating the term…
Abstract
A bulb type electrodeless discharge lamp, comprising a recessed part (102), wherein the maximum diameter of a light emitting tube (101) is 60 to 90 mm and the tube wall load of the light emitting tube (101) is 0.07 to 0.11 W/cm2, and a relation between the diameter Dc of the recessed part (102) and an interval Δh between the top of the recessed part (102) and the top part of the light emitting tube (101) meets the requirement of Δh≦1.15×Dc+1.25 [mm].
Claims11
A compact self-ballasted electrodeless discharge lamp comprising:
- a bulb filled with discharge gas containing mercury enclosed in the bulb in the form of mercury element, not in the form of amalgam, and a rare gas;
- an excitation coil installed near the bulb;
- a ballast circuit which supplies high frequency power to the excitation coil;
- and
- a base that is electrically connected to the ballast circuit,
- wherein:
- the bulb, the excitation coil, the ballast circuit and the base are formed into an integral part;
- the bulb has a virtually spherical shape or a virtually ellipsoidal shape;
- a recessed portion to which the excitation coil is inserted is formed on the ballast circuit side of the bulb;
- the recessed portion has an opening section on the ballast circuit side, and has a tube shape with a virtually round shape in a cross section thereof, with a portion positioned on a side opposite to the opening section of the recessed portion being provided with a function for suppressing the convection of the discharge gas;
- a largest diameter of the bulb is set in a range from not less than 60 mm to not more than 90 mm;
- a bulb wall loading of the bulb during a stable lighting operation is set in a range from not less than 0.07 W/cm2 to not more than 0.11 W/cm2;
- a ratio (h/D) of a height (h) of the bulb based upon an end face of the opening section in the recessed portion to the largest diameter (D) of the bulb is set in a range from not less than 1.0 to not more than 1.3;
- supposing that a distance between a top face of the recessed portion positioned on the side opposite to the opening section of the recessed portion and a top portion of the bulb facing the top face of the recessed portion is Δh, and that a diameter of a portion positioned on the side opposite to the opening section of the recessed portion is Dc, the following relationship is satisfied:
- Δh≦1.15×Dc+1.25 mm;
- the excitation coil is constituted by a core and a coil wound around the core;
- and
- a center portion of a portion around which the coil is wound in the longitudinal direction of the core is positioned within a range that is apart from a plane on which the largest diameter of the bulb is located by a distance from not less than 8 mm to not more than 20 mm toward the ballast circuit side.
15 more elements
A compact self-ballasted electrodeless discharge lamp comprising:
- a bulb filled with discharge gas containing mercury enclosed in the bulb in the form of mercury element, not in the form of amalgam, and a rare gas;
- an excitation coil installed near the bulb;
- a ballast circuit which supplies high frequency power to the excitation coil;
- and
- a base that is electrically connected to the ballast circuit,
- wherein:
- the bulb, the excitation coil, the ballast circuit and the base are formed into an integral part;
- the bulb has a virtually spherical shape or a virtually ellipsoidal shape;
- a recessed portion to which the excitation coil is inserted is formed on the ballast circuit side of the bulb;
- the recessed portion has an opening section on the ballast circuit side, and has a tube shape with a virtually round shape in a cross section thereof, with a portion positioned on a side opposite to the opening section of the recessed portion being provided with a function for suppressing the convection of the discharge gas;
- a largest diameter of the bulb is set in a range from not less than 55 mm to not more than 75 mm;
- a bulb wall loading of the bulb during a stable lighting operation is set in a range from not less than 0.05 W/cm2 to less than 0.07 W/cm2;
- a ratio (h/D) of a height (h) of the bulb based upon an end face of the opening section in the recessed portion to the largest diameter (D) of the bulb is set in a range from not less than 1.0 to not more than 1.3;
- supposing that a distance between a top face of the recessed portion positioned on a side opposite to the opening section of the recessed portion and a top portion of the bulb facing the top face of the recessed portion is Δh, and that a diameter of a portion positioned on the side opposite to the opening section of the recessed portion is Dc, the following relationship is satisfied:
- Δh≦1.92×Dc−22.4 mm;
- the excitation coil is constituted by a core and a coil wound around the core;
- and
- a center portion of a portion around which the coil is wound in the longitudinal direction of the core is virtually positioned on a plane within which the largest diameter of the bulb is located.
15 more elements
An electrodeless-discharge-lamp lighting device comprising:
- a bulb which is filled with discharge gas containing mercury enclosed in the bulb in the form of mercury element, not in the form of amalgam, and a rare gas, and which has a recessed portion;
- an excitation coil inserted in the recessed portion;
- and
- a ballast circuit which supplies high frequency power to the excitation coil,
- wherein:
- the bulb has a virtually spherical shape or a virtually ellipsoidal shape;
- the recessed portion has an opening section on the ballast circuit side, and has a tube shape with a virtually round shape in a cross section thereof;
- a largest diameter of the bulb is set in a range from not less than 60 mm to not more than 90 mm;
- a bulb wall loading of the bulb during a stable lighting operation is set in a range from not less than 0.07 W/cm2 to not more than 0.11 W/cm2;
- a ratio (h/D) of a height (h) of the bulb based upon an end face of the opening section in the recessed portion to the largest diameter (D) of the bulb is set in a range from not less than 1.0 to not more than 1.3;
- supposing that a distance between a top face of the recessed portion positioned on a side opposite to the opening section of the recessed portion and a top portion of the bulb facing a top face of the recessed portion is Δh, and that a diameter of a portion positioned on a side opposite to the opening section of the recessed portion is Dc, the following relationship is satisfied:
- Δh≦1.15×Dc+1.25 mm;
- and
- the diameter Dc of a portion positioned on the side opposite to the opening section of the recessed portion is greater than the diameter of a portion corresponding to virtually a center portion of the recessed portion in the longitudinal direction of the excitation coil.
11 more elements
An electrodeless-discharge-lamp lighting device comprising:
- a bulb which is filled with discharge gas containing mercury enclosed in the bulb in the form of mercury element, not in the form of amalgam, and a rare gas, and which has a recessed portion;
- an excitation coil inserted in the recessed portion;
- and
- a ballast circuit which supplies high frequency power to the excitation coil,
- wherein:
- the bulb has a virtually spherical shape or a virtually ellipsoidal shape;
- the recessed portion has an opening section on the ballast circuit side, and has a virtually cylinder shape with a virtually round tube shape in a cross section thereof;
- a largest diameter of the bulb is set in a range from not less than 55 mm to not more than 75 mm;
- a bulb wall loading of the bulb during a stable lighting operation is set in a range from not less than 0.05 W/cm2 to less than 0.07 W/cm2;
- a ratio (h/D) of a height (h) of the bulb based upon an end face of the opening section in the recessed portion to the largest diameter (D) of the bulb is set in a range from not less than 1.0 to not more than 1.3;
- supposing that a distance between a top face of the recessed portion positioned on a side opposite to the opening section of the recessed portion and a top portion of the bulb facing a top face of the recessed portion is Δh, and that a diameter of a portion positioned on the side opposite to the opening section of the recessed portion is Dc, the following relationship is satisfied:
- Δh≦1.92×Dc−22.4 mm;
- and
- the diameter Dc of a portion positioned on the side opposite to the opening section of the recessed portion is greater than the diameter of a portion corresponding to virtually a center portion of the recessed portion in the longitudinal direction of the excitation coil.
11 more elements
Dependencies are inferred from the claim text.