Abstract:
A microwave electrodeless lamp includes an electrodeless bulb (34) enclosing a light generating fill, a mesh screen (32) surrounding the bulb with at least half the bulb volume completely within the mesh; the mesh together with other conductive surface defining a microwave cavity (114), a magnetron (46) for providing microwave energy, and a waveguide (40) for transmitting the microwave energy from the magnetron to the microwave cavity, wherein the minimum distance between the outer bulb surface and the closest portion of the mesh is selected in accordance with the temperature of the bulb during operation and the temperature at which the screen material degrades. Other embodiments and aspects are also disclosed.
Abstract:
An integrated electrodeless lamp (11) includes a lamp housing (13) defining two or more compartments (33, 35, 37) housing components of the lamp (11), wherein at least one compartment (33) provides an opening (17) in the lamp housing (13), a cover (15) fitted to the lamp housing (13), and an optics assembly (19) positioned in the opening (17) in the lamp housing (13), wherein the lamp housing (13), the cover (15), and the optics assembly (19) provide an RF sealed system. The lamp components include an RF source providing RF energy for the lamp (11), an aperture bulb (51) assembly including an electrodeless envelope (54) containing a discharge forming fill which emits light when excited by RF energy, andan excitation structure for coupling RF energy from the RF source to the discharge forming fill. The optics assembly (19) may be mounted in the opening (17) in the lamp housing (13) with a twist lock mounting structure. The application also discloses solid state oscillators comprising either a turning circuit having a pair of complementary varactor diodes or a solid state active element with at least two die which may be comprised in the RF source of such an integrated electrodeless lamp (11).
Abstract:
An integrated high brightness electrodeless lamp includes a lamp base defining two or more compartments housing components of the lamp, wherein at least one compartment provides an opening in the lamp base, a cover fitted to the lamp base, and an optics assembly positioned in the opening in the lamp base, wherein the lamp base, the cover, and the optics assembly provide an RF sealed system. The lamp components include an RF source providing RF energy for the lamp, an aperture bulb assembly including an electrodeless envelope containing a discharge forming fill which emits light when excited by RF energy, and an excitation structure for coupling RF energy from the RF source to the discharge forming fill. The optics assembly may be mounted in the opening in the lamp base with a twist lock mounting structure.
Abstract:
An electrodeless discharge lamp includes an electrodeless lamp bulb enclosing a fill which emits light when excited, an excitation structure positioned near the bulb and adapted to excite the fill, a rotation assembly connected to the bulb and adapted to rotate the bulb during operation of the lamp, and a plurality of structures formed on an outer surface of the bulb adapted to enhance cooling of the bulb. In some cases the structures are distributed in accordance with a temperature profile of the bulb to provide a relatively more uniform bulb temperature during operation. Some structures include protrusions which are distributed around the entire surface of the bulb. Some structures include protrusions which are distributed around the entire surface of the bulb except in the region of the bulb equator. Some structures include a plurality of ribs attached to an outer surface of the bulb, wherein the ribs are aligned transverse to a plane of the equator of the bulb. In some cases the ribs are offset from the surface of the bulb by one or more supports. Some structures include a pair of rings attached to an outer surface of the bulb.
Abstract:
Various projection systems are described with improved performance. A projection system utilizes negative distortion together with a pre-compensated light source to reduce spill. A projection system utilizes a single angle transforming optical element positioned between an imager and a light source to increase throughput. A two panel projection system utilizes both polarities to increase light output. A projection system utilizes a three segment color wheel with a small white bias in each segment to reduce color breakup. A projection system utilizes a digital micro-mirror device and recycles OFF state light. A projection system utilizes two color wheels to improve recycling of light. A two panel projection system utilizes a color wheel which transmits a deficient color band and time sequences the other bands while reflecting the unused light back to the light source for recycling.
Abstract:
An electrodeless discharge lamp (11) includes a pair of opposed couplers (12, 13) aligned along an axis (A), a light transmissive envelope (14) positioned between the pair of opposed couplers (12, 13), the envelope (14) having an interior length (L) along the axis (A) which is greater than a maximum interior dimension (D) of the envelope (14) orthogonal to the axis (A), a light emitting fill disposed inside the envelope (14), the fill including at least one fill substance selected from the group of sulfur, selenium, and tellurium in a concentration of at least 1 mg/cm 3 for each selected fill substance. A power source (15) may be connected to the couplers (12, 13), wherein power applied to the couplers (12, 13) from the power source (15) is effective to initiate and sustain a stable light emitting discharge from the fill. For example, the envelope (14) may be capsule shaped or have the shape of a prolate ellipsoid. The lamp (14) operates at low power and is stable without rotation.
Abstract:
An ultra bright, low wattage inductively coupled electrodeless aperture lamp is powered by a solid state RF source in the range of several tens to several hundreds of watts at various frequencies in the range of 400 to 900 MHz. Numerous novel lamp circuits and components are disclosed including a wedding ring shaped coil having one axial and one radial lead, a high accuracy capacitor stack, a high thermal conductivity aperture cup and various other aperture bulb configurations, a coaxial capacitor arrangement, and an integrated coil and capacitor assembly. Numerous novel RF circuits are also disclosed including a high power oscillator circuit with reduced complexity resonant pole configuration, parallel RF power FET transistors with soft gate switching, a continuously variable frequency tuning circuit, a six port directional coupler, an impedance switching RF source, and an RF source with controlled frequency-load characteristics. Numerous novel RF control methods are disclosed including controlled adjustment of the operating frequency to find a resonant frequency and reduce reflected RF power, controlled switching of an impedance switched lamp system, active power control and active gate bias control.
Abstract:
Various projection systems are described with improved performance. A projection system utilizes negative distortion together with a pre-compensated light source to reduce spill. A projection system utilizes a single angle transforming optical element positioned between an imager and a light source to increase throughput. A two panel projection system utilizes both polarities to increase light output. A projection system utilizes a three segment color wheel with a small white bias in each segment to reduce color breakup. A projection system utilizes a digital micro-mirror device and recycles OFF state light. A projection system utilizes two color wheels to improve recycling of light. A two panel projection system utilizes a color wheel which transmits a deficient color band and time sequences the other bands while reflecting the unused light back to the light source for recycling.
Abstract:
A high frequency inductively coupled electrodeless lamp includes an excitation coil with an effective electrical length which is less than one half wavelength of a driving frequency applied thereto, preferably much less. The driving frequency may be greater than 100 MHz and is preferably as high as 915 MHz. Preferably, the excitation coil is configured as a non-helical, semi-cylindrical conductive surface having less than one turn, in the general shape of a wedding ring. At high frequencies, the current in the coil forms two loops which are spaced apart and parallel to each other. Configured appropriately, the coil approximates a Helmholtz configuration. The lamp preferably utilizes a bulb encased in a reflective ceramic cup with a pre-formed aperture defined therethrough. The ceramic cup may include structural features to aid in alignment and/or a flanged face to aid in thermal management. The lamp head is preferably an integrated lamp head comprising a metal matrix composite surrounding an insulating ceramic with the excitation integrally formed on the ceramic. A novel solid-state oscillator preferably provides RF power to the lamp. The oscillator is a single active element device capable of providing over 70 watts of power at over 70 % efficiency. Various control circuits may be employed to match the driving frequency of the oscillator to a plurality of tuning states of the lamp.
Abstract:
Various lamp systems are disclosed which effectively utilize light from an aperture lamp (3). Lamp systems are respectively configured to perform various types of light recapture including etendue recycling, polarization recycling, and/or color recycling. Various novel optical elements are disclosed including an electrodeless light bulb (5) with an integral lens (9), a molded quartz ball lens with an integral flange, a molded quartz CPC with an integral flange, a truncated CPC, and a segmented CPC. Various novel optical systems are disclosed including systems which perform angle selection and/or etendue selection.