Abstract LIGHT SOURCE A light source is powered by a magnetron 1 and has a quartz crucible 2 having a plasma void 8 with an excitable fill, from which light radiates in use. Two aluminium attachment blocks 3,4 are attached together and the block 3 is attached to a casing 5 of the magnetron 1 by screws - not shown. ...

To the common point C of two transistors of a magnetron switched converter power circuit is connected a coupling capacitor C11 which provides input to a starter circuit (24). A transistor switch (25) is in series with the capacitor C11 and a diode D1. When the switch is off no current flows in D11. When the switch i...

A High Frequency light source (11) has a central body (12) of fused quartz with a central void (14) filled with a fill (16) in the void of material excitable by High Frequency energy to form a light emitting plasma. An inner sleeve (17) of perforate metal shim extends along the length of the central body to within 2...

A lamp comprises a light source in the form of a light emitting resonator (1), a magnetron (2) and a stub tuner (3). A reflector (4) is fitted at the junction of the light source and the stub tuner, for directing the light in a generally collimated beam (5). The light emitting resonator comprises an enclosure (11) f...

A LUWPL luminaire has a housing (201) with a lower transparent closure (202) and a heat dissipating top (203) of cast aluminium. This has a suspension eye (204). The housing has an upper flange (205) via which it is bolted with the interposition of a seal 206 to a underside rim (207) of the top. Within the rim the u...

A lamp has microwave resonant body(11) of transparent quartz. The body has central bore(16), having a sealed plasma enclosing bulb(17) inserted in it. The bulb is also quartz and has a external diameter which is a close fit in the bore. The bulb itself is of drawn quartz tube(18) and as such has a smoother internal ...

A lamp (1) comprises an oscillator and amplifier source (2) of microwave energy, typically operating at 2.45 or 5.8 GHz or other frequencies within an ISM band. The source passes the microwaves via a matching circuit (3) to an antenna (4) ex -tending into a re-entrant (5) in a lucent waveguide (6). This is of quartz...

A method of applying a Faraday cage to a lucent resonator (1) the resonator having a void (2) containing microwave  excitable material and being adapted for microwave resonance in the resonator and within the Faraday cage for driving a light emitting plasma in the void the method consisting in the steps of: • deposi...

A plasma crucible (92) has a through bore (93) and two tubes (981, 982) but sealed on to the end faces (901, 902) of the crucible. One (981) of the tubes is closed prior to the filling of the crucible. The tube is tipped off and worked in a glass lathe to form it to have a flat end (983). After evacuation, dosing an...

For operation in the TMOIO mode at 2450 MHz, a lucent crucible of quartz is 4.9cm in diameter and 2.1cm in length.A sealed plasma void is placed centrally axis, with an antenna reentrant at one end,but offset from the central axis of the crucible and close to the central void.Various TE modus are also possible ...

A power supply for a magnetron has a high voltage converter (101) a microprocessor (103) and a resistor (109). The high voltage converter comprises an integrated circuit oscillator IC1 switching transistors T1 T2 an inductance LI a transformer (106) and a rectifier (107). A voltage source (4) supplies an augmented D...

A method of making an electrodeless incandescent bulb comprises the steps of; providing a bulb tube of quartz glass, closing one end of the bulb tube, forming a neck having a bore less than the internal diameter of the bulb tube, inserting a pellet of excitable material into the bulb tube through the adjacent neck, ...

A band pass filter (1) comprises an air filled aluminium chamber (2). having a lid (3) and a cuboid resonant cavity (4) having a central iris (5). At opposite end nodes of the cavity, perfect electric conductors (PHCs) (6, 7) are provided. One is connected to a feed wire (8) from an input (9) at one end of the cavit...

An electrodeless, microwave lamp (1) has a magnetron (2) as a microwave source and an excitable material lucent crucible (5) in whose excitable material a plasma is established. For coupling microwaves from the magnetron into the crucible, an air wave guide coupling circuit (4) is provided, with an output of the mag...

A lucent waveguide plasma light source (LUWPL) (1) has a quartz waveguide body (2) with a central through bore (3). The bore has orifices (4 5) at its opposite ends opening centrally of flat end faces (6 7) of the body (2). Between these the body has a circular cylindrical periphery (8). A drawn quartz tube (10) is ...

A low-dose, preferably unsaturated, fill of microwave excitable material (9), including at least two metal halides in a noble gas with an optional mercury buffer, is contained in a plasma crucible (2) to form a light emitting plasma therein.