The present invention relates to a coaxial cable-type plasma lamp device, which has, in a coaxial cable form, a conductor formed in a concentric line inside a discharge tube, has a transparent conductor formed outside the discharge tube, and enables light to be generated through a plasma discharge by emitting an electromagnetic wave into gas filling in the discharge tube. The coaxial cable-type plasma lamp device according to the present invention comprises: a discharge tube filled with discharge gas and in which a plasma discharge occurs through the discharge gas; an inner conductor formed by penetrating the discharge tube; an outer conductor formed by surrounding the discharge tube; a terminator for connecting, at a one-sided terminal of the discharge tube, the inner conductor and the outer conductor through a resistor; and an adaptor for fixing and supporting the inner conductor, the discharge tube, and the outer conductor on the other side of the discharge tube, and for separably connecting the inner conductor to an external coaxial cable.

A lamp socket includes a first socket portion, a second socket portion, and a neck portion joining the first and the second socket portions. The first socket portion defines a first cylindrical volume proximate to an open end of the lamp socket. The second socket portion is concentric with the first socket portion and defines a second cylindrical volume distal from the open end of the lamp socket. The second socket portion has a smaller diameter than the first socket portion.

A lamp socket includes a first socket portion, a second socket portion, and a neck portion joining the first and the second socket portions. The first socket portion defines a first cylindrical volume proximate to an open end of the lamp socket. The second socket portion is concentric with the first socket portion and defines a second cylindrical volume distal from the open end of the lamp socket. The second socket portion has a smaller diameter than the first socket portion.

The invention provides a lamp screw cap (200) comprising a thread structure (220), wherein the thread structure (220) comprises repetitive elements (225) defining tops (230), valleys (240), and a central plane (250), wherein tops (230) protrude relative to the central plane (250) and wherein the valleys (240) are recessed relative to the central plane (250), wherein: for a plurality of tops (230) applies that each top (230) comprises a first top segment (231), a second top segment (232), and a middle top segment (233), together defining the top (230), wherein the middle top segment (233) is configured most remote from the central plane (250); for a plurality of valleys (240) applies that each valley (240) comprises a first valley segment (241), a second valley segment (242), and a middle valley segment (243), together defining the valley (240), wherein the middle valley segment (243) is configured most remote from the central plane (250); the first top segment (231), the second top segment (232), the first valley segment (241), and the second valley segment (242), have the same first curvature; one or more of the following applies: the plurality of tops (230) have a protruding part (235) protruding relative to the first curvature in a direction away from the central plane (250); and the plurality of valleys (240) have a shallow part (245) receding relative to the first curvature in a direction to the central plane (250).

A lightbulb comprising a bulb portion (10) in which is housed an illuminating component configured to selectively emit visible light, the lightbulb having a cap portion (16) configured to mount the lightbulb in a light fitting or lamp holder, the cap portion incorporating a adaptor element configured to selectively alter the configuration of the cap portion between a screw fitting and a bayonet fitting.

A lightbulb comprising a bulb portion (10) in which is housed an illuminating component configured to selectively emit visible light, the lightbulb having a cap portion (16) configured to mount the lightbulb in a light fitting or lamp holder, the cap portion incorporating a adaptor element configured to selectively alter the configuration of the cap portion between a screw fitting and a bayonet fitting.

An RF feedthrough has an electrically insulative cone that is hollow having first and second openings at first and second ends having first and second diameters. The first diameter is larger than the second diameter, defining a tapered sidewall of the cone to an inflection point. A stem is coupled to the second end of the cone, and passes through the first opening and second opening. A flange is coupled to the first end of the cone and has a flange opening having a third diameter. The third diameter is smaller than the first diameter. The stem passes through the flange opening without contacting the flange. The flange couples the cone to a chamber wall hole. Contact portions of the cone may be metallized. The cone and flange pass the stem through the hole while electrically insulating the stem from the wall of the chamber.

A combined power socket for artificial Christmas trees having a pair of sockets set in a ring structure capable of being sleeved on an outer surface of a rod or tube The pair of sockets can be combined as a group, and can be connected with additional power sockets to achieve interconnection, at the same time through the power supply connector leads from each combination type power socket for external devices, such as lamp series power supply, which has the advantages of simpler structure, more convenient connections to external devices.

An RF feedthrough has an electrically insulative cone that is hollow having first and second openings at first and second ends having first and second diameters. The first diameter is larger than the second diameter, defining a tapered sidewall of the cone to an inflection point. A stem is coupled to the second end of the cone, and passes through the first opening and second opening. A flange is coupled to the first end of the cone and has a flange opening having a third diameter. The third diameter is smaller than the first diameter. The stem passes through the flange opening without contacting the flange. The flange couples the cone to a chamber wall hole. Contact portions of the cone may be metallized. The cone and flange pass the stem through the hole while electrically insulating the stem from the wall of the chamber.

Devices and methods relating to insulation-free lead wires in compact fluorescent lamps are provided. For example, there is provided a compact fluorescent lamp including at least two lead wires. Each of the lead wires can be connected to a respective cathode of a respective discharge tube. The compact fluorescent lamp further includes a ballast circuit. The lead wires are isolated from one another without any insulation.