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US 2003/0155864 A1Published application
Discharge lamp, light source and projecting display unit
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMitsuhiro Wada, Suguru Nakao, Toshiaki Ogura, Takeharu Tsutsumi
Life of this patent
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Abstract
A discharge lamp of the present invention, which has an starting property, an arc stability and a service life which are improved even if the lamp produces a short arc. The discharge lamp includes a light emitting bulb, sealing members disposed on both sides of the light emitting bulb, metal foils sealed in the sealing members, a pair of electrodes which are connected to the metal foils and have large-diameter portions formed on tips, coils disposed at the rear of the large-diameter portions of the electrodes, external conductors, and a discharge medium enclosed in the light emitting bulb.
Claims25
A discharge lamp comprising:
- a light emitting bulb;
- sealing members disposed at both ends of said light emitting bulb;
- a pair of electrodes which are sealed in said sealing members and disposed in said light emitting bulb so as to oppose to each other at a predetermined spacing;
- and
- a discharge medium enclosed in said light emitting bulb,
- wherein said electrode is composed of an electrode shaft and a discharge member which is formed integrally with a tip of said electrode shaft and has an outside diameter larger than that of said electrode shaft, and has a heat dissipating conductor which is disposed at the rear of said discharge member so as to surround said electrode shaft.
3 more elements
A discharge lamp comprising:
- a light emitting bulb;
- sealing members disposed at both ends of said light emitting bulb;
- a pair of electrodes which are sealed in said sealing members and disposed in said light emitting bulb so as to oppose to each other at a predetermined spacing;
- and
- a discharge medium enclosed in said light emitting bulb,
- wherein said electrode is composed of an electrode shaft and a discharge member which is formed integrally with a tip of said electrode shaft and has an outside diameter larger than that of said electrode shaft, said discharge member having a taper formed on its tip, said electrode having a heat dissipating conductor which is disposed at the rear of said discharge member so as to surround the electrode shaft, and
- wherein said discharge lamp satisfies the following conditions:
- φ/L≦0.6
- 20°≦θ≦60°
- where the reference symbol L denotes a spacing between said electrodes disposed in said light emitting bulb, the reference symbol φ denotes a diameter of the tip of the discharge member, and the reference symbol θ denotes an angle between said taper and said electrode shaft.
7 more elements
A discharge lamp comprising:
- a light emitting bulb;
- sealing members disposed at both ends of said light emitting bulb;
- a pair of electrodes which are sealed in said sealing members and disposed in said light emitting bulb so as to oppose to each other at a predetermined spacing;
- and
- a discharge medium enclosed in said light emitting bulb,
- wherein said electrode is composed of an electrode shaft and a cylindrical conductor fitted over a tip of said electrode shaft, and has a heat dissipating conductor which is disposed at the rear of said cylindrical conductor so as to surround said electrode shaft.
3 more elements
A discharge lamp comprising:
- a light emitting bulb;
- sealing members disposed at both ends of said light emitting bulb;
- a pair of electrodes which are sealed in said sealing members and disposed in said light emitting bulb so as to oppose to each other at a predetermined spacing;
- and
- a discharge medium enclosed in said light emitting bulb,
- wherein said electrode has an electrode shaft, a cylindrical conductor which is fitted over a tip of said electrode shaft and has a taper formed on an outer circumference on a side of the tip of said electrode, and a heat dissipating conductor which is disposed at the rear of said cylindrical conductor so as to surround said electrode shaft, and
- wherein said discharge lamp satisfies the following conditions:
- φ/L≦0.6
- 20°≦θ≦60°
- where the reference symbol L denotes a spacing between said electrodes disposed in said light emitting bulb, the reference symbol φ denotes an outside diameter of an end surface of said cylindrical conductor which is near the tip of said electrode shaft, and the reference symbol θ denotes an angle between said taper and said electrode shaft.
7 more elements
A discharge lamp comprising:
- a light emitting bulb;
- sealing members which are disposed at both ends of said light emitting bulb;
- a pair of electrodes which are sealed in said sealing members and disposed in said light emitting bulb so as to oppose to each other at a predetermined spacing;
- and
- mercury and a rare gas which are enclosed in said light emitting bulb,
- wherein said mercury is enclosed in an amount of 150 mg/cc or more,
- wherein said electrode is composed of an electrode shaft and a discharge member which is formed integrally with a tip of said electrode shaft and has an outside diameter larger than that of said electrode shaft, said discharge member having a taper formed on its tip, said electrode having a heat dissipating conductor which is disposed at the rear of said discharge member so as to surround said electrode shaft, and
- wherein said discharge lamp satisfies the following conditions:
- φ/L≦0.6
- 20°≦θ≦60°
- where the reference symbol L denotes a spacing between said electrodes disposed in said light emitting bulb, the reference symbol φ denotes a diameter of the tip of said discharge member, and the reference symbol θ denotes an angle between said taper and said electrode shaft, such that said discharge lamp is lighted by applying an AC voltage across said electrodes.
8 more elements
A light source apparatus comprising:
- a discharge lamp;
- and
- a concave reflector which reflects rays emitted from said discharge lamp in a predetermined direction,
- wherein said discharge lamp has metal foils which are disposed at both ends of a light emitting bulb and have different lengths,
- wherein said concave reflector has an opening through which reflected rays are emitted and a lamp insert hole which is disposed on a side opposite to said opening, and
- wherein said discharge lamp is disposed so that a sealing member in which a shorter metal foil is sealed is inserted into said lamp insert hole and a center of a light emitting area formed in said light emitting bulb is approximately coincident with a shorter focal point of said concave reflector.
3 more elements
A light source apparatus comprising:
- a discharge lamp;
- a concave reflector which reflects rays emitted from said discharge lamp in a predetermined direction;
- and
- light transmittal enclosing means which is disposed in an opening of said concave reflector on a reflected-rays-emitting side to form an enclosed space in said concave reflector,
- wherein an inert gas is enclosed in said enclosed space.
2 more elements
A light source apparatus comprising:
- a discharge lamp;
- a concave reflector which reflects rays emitted from said discharge lamp in a predetermined direction;
- and
- light transmittal enclosing means which is disposed in an opening of said concave reflector on a reflected-rays-emitting side to form an enclosed space in said concave reflector,
- wherein a gas is enclosed in said enclosed space at a pressure higher than 1 atmospheric pressure and lower than a working pressure for said discharge lamp.
2 more elements
A light source apparatus comprising:
- a discharge lamp having a working pressure not lower than 10 MPas (mega pascals);
- a concave reflector which reflects rays emitted from said discharge lamp in a predetermined direction;
- and
- light transmittal enclosing means,
- wherein said discharge lamp has metal foils which are sealed in sealing members disposed at both ends of a light emitting bulb and have different lengths,
- wherein said concave reflector has an opening through which reflected rays are emitted and a lamp insert hole which is disposed on a side opposite to said opening,
- wherein said discharge lamp is disposed so that a sealing member in which a shorter metal foil is sealed is inserted into said lamp insert hole and a center of a light emitting area formed in said light emitting bulb is approximately coincident with a shorter focal point of said concave reflector, and
- wherein said enclosing means is disposed in said opening of said concave reflector.
5 more elements
Dependencies are inferred from the claim text.