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1176 results about "Fresnel lens" patented technology

A Fresnel lens (/ˈfreɪn-, ˈfrɛn.ɛl, -əl/ FRAYN-, FREN-el, -⁠əl, /freɪˈnɛl/ fray-NEL or /ˈfrɛznəl/ FREZ-nəl) is a type of composite compact lens originally developed by French physicist Augustin-Jean Fresnel for lighthouses. It has been called "the invention that saved a million ships."

Ultraviolet sterilizer for surgery

An ultraviolet sterilizer for use during surgery is mounted in a base cabinet. The UV light source can be a laser, or an LED. An optical frequency multiplier can be used that outputs UV of less than 280 nm, or greater than 320 nm, to avoid burning the patient. A visible LED aiming light directs the UV light toward the surgery. A crosshair image can be projected to position the light.
One lamp has a housing, a cavity, a handle, and an ocular plate to pass the UV and the aiming light. An articulated arm allows selective positioning of the lamp. Another lamp has a stylus, a handle, and a tip small enough for easy insertion into a small incision for arthroscopy. A fiber optic cable connects the UV and the aiming light to the lamp. Lenses or filters can be used with the fiber optic cable.
An electronic power supply and a CPU connect to the UV and the aiming light sources. A keyboard inputs commands to the CPU. A sensor provides feedback.
Another UV sterilizer is mounted on a ceiling of the operating room. A lamp has a housing with a cavity. Either a curved or a flat substrate is mounted in the cavity. Solid state UV elements are arrayed on the substrate, along with visible LEDs for aiming. Either a curved or a flat mirror is disposed behind the substrate. An ocular plate passes the UV and the aiming light, and protects the elements from damage. The ocular plate is a diffuser, a filter, or a fresnel lens.
Owner:FELIX PERRY

Inflatable fresnel lens solar concentrator for space power

A novel, high-efficiency, extremely light-weight, inflatable refractive solar concentrator for space power is described. It consists of a flexible Fresnel lens, flexible sides, and a back surface, together enclosing a volume of space which can be filled with low pressure gas to deploy the concentrator on orbit. The back surface supports the energy receiver/converter located in the focal region of the Fresnel lens. The back surface can also serve as the waste heat radiator. Prior to deployment, the deflated flexible lens and sides are folded against the back surface to form a flat, low-volume package for efficient launch into space. The inflatable concentrator can be configured to provide either a line focus or a point focus of sunlight. The new inflatable concentrator approach will provide significant advantages over the prior art in two different space power areas: photovoltaic concentrator arrays and high-temperature solar thermal conversion systems. Photovoltaic concentrator arrays using the new inflatable lens will be much lighter than prior space concentrator arrays. In addition, for photovoltaic concentrator arrays, the new inflatable lens will eliminate the need for a fragile glass superstrate to support the lens, substantially improving robustness of the lens. Solar thermal concentrator arrays using the new inflatable lens will be much lighter than prior art space concentrators which used parabolic mirrors. In addition, for solar thermal applications in space, the new inflatable lens will eliminate the need for high surface accuracy, which has been a significant problem for prior art concentrators.
Owner:ENTECH INC +1

Intracorneal lens placement method and apparatus

InactiveUS7207998B2Minimal disturbance of setupEasy to keepEye surgerySurgeryRefractive indexEngineering
A method and apparatus for correcting vision, including a corneal-pocket keratome device to create a corneal pocket and a lens to be inserted and retained in the corneal pocket to effect correction. The corneal-pocket keratome includes a drive unit having cutting head elements which contact the subject eye during corneal pocket formation. The cutting head elements may be removeable and may be disposable. The cutting head elements include a corneal restraint device, which may be a positioning ring to position an eyeball with the cornea protruding through the ring; a keratome blade assembly with a corneal-pocket blade; and may also include an applanation shoe surface to restrain the cornea, in addition or instead of the positioning ring. The applanation shoe may be pivotable away from the surgical area. The corneal-pocket blade may include a guide which travels with the blade. The blade assembly oscillates laterally while extending forward into the cornea to form the pocket, and the amplitude of the lateral oscillation is preferably increased as the blade goes beyond an opening incision into the cornea. Lenses for this invention preferably include a feature to impede accidental lens movement after the lens is disposed within the corneal pocket, which may be a swelling after insertion or a circumferential irregularity. Lenses may be of Fresnel or non-Fresnel type, and may employ annular changes in the index of refraction of the lens material, as well as changes in refractive shape which may be annular or not, to effect variations in focal length for relieving presbyopia, astigmatism, and combinations of those as well as myopia and hyperopia. Drive control and vacuum for the positioning ring are provided under user command by a control unit having user inputs.
Owner:BIOVISION AG

Light-gathering wind and light complementary power station with automatic sun tracking function and maximum power point tracking function

The invention relates to a light-gathering wind and light complementary power station with an automatic sun tracking function and a maximum power point tracking function, which comprises a light-gathering device, a photovoltaic cell array device, a tracking driving device, a photovoltaic controller with a maximum power point tracking function, and a wind generating set, wherein the light-gathering device and the photovoltaic cell array device comprise a frame consisting of a Fresnel lens light-gathering device array and a photovoltaic cell array respectively; the tracking driving device comprises an intelligent control system for driving the light-gathering device and the photovoltaic cell array device to move in a sun-tracking manner, and a mechanical control and transmission device; the photovoltaic controller with the maximum power point tracking function consists of a voltage sampling circuit, a current sampling circuit and a microprocessor in which a multiplier and a comparator are arranged; and the wind generating set consists of a wind-driven generator and a wind turbine controller. The light-gathering wind and light complementary power station has high automation degree, light weight and high photoelectric conversion efficiency. By adopting the photovoltaic controller with the maximum power point tracking function, the investment cost of photoelectric power generation can be greatly lowered, and the power generating efficiency is greatly increased.
Owner:张文迅 +1
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