68results about How to "Significant distortion" patented technology

High efficiency reflective volume Bragg gratings with chirped gratings recorded in photo-thermo-refractive glass having an absolute diffraction efficiency exceeding 95% in transmitting and reflecting modes are used to stretch and/or compress ultrashort laser pulses with high efficiency. Robustness, compactness, thermal and laser stability along with placement of multiple elements in the same space provides femtosecond laser system with high efficiency of stretching and re-compression of femtosecond pulses.

The sound-permeable member 18 includes a waterproof sound-permeable membrane 1 that allows sound to pass therethrough and blocks liquid from passing therethrough and a main body 8 having an opening 8p for passing sound. The opening 8p is closed by the waterproof sound-permeable membrane 1. The waterproof sound-permeable membrane 1 is fixed to the main body 8 in a slack state. A polytetrafluoroethylene porous membrane and a porous ultrahigh-molecular weight polyethylene membrane preferably can be used as the waterproof sound-permeable membrane 1.

The piezoelectric generator is characterized by providing a spacer member in the vicinity of a fixed end of an elastic plate mounted on a base plate by means of affixing both ends in such a way as to prevent the elastic plate not to be deformed unnecessarily when a load is applied to the elastic plate from above, so that a piezoelectric ceramic plate glued onto the elastic plate generates electric power by the elastic plate's deformation.

The invention comprises a method and apparatus for equal channel angular extrusion (ECAE) of flat billets to control material structure and properties. The improvements of the method include the special systems of billet orientations, billet lubrication, billet ejection from dies, and a press/die control system those eliminate surface cracks, flashes and billet reshaping or deburring between passes. Therefore, multi-pass ECAE becomes a cost-effective industrial operation and may be applied to large billets.

A recoil starter capable of preventing vibration of a damper spring due to vibrations of an engine caused during running of the engine, to thereby restrain abrasion of a rope reel, a cam and the like which are made of a plastic material, resulting in the durability of the recoil starter being enhanced. The recoil starter includes a drive section comprised of a rope reel which is rotated by pulling a recoil rope and a cam for transmitting the rotational force of the reel to a crankshaft of the engine through a one-way rotative transmission mechanism. A damper spring in the shape of a torsion coil spring is held in annular recesses formed in joint surfaces of the rope reel and cam to face each other while the damper spring is resiliently distorted, so that the rope reel and the cam are rotatingly coupled with each other through the damper spring.

A molded foam pool chair (12) is provided by a continuous form (26) of pliable foam material of constant density having varying thicknesses to provide a rigid base portion (30) and an elastic seat portion (28). The rigid base portion (30) extends around and is continuous with the elastic seat portion (28). The rigid base portion (30) defines a peripheral edge (44) having a shape and has cross-sectional areas of sufficient thickness and width to prevent substantial distortion of the shape of the peripheral edge (44) between unloaded and loaded conditions. The elastic seat portion (28) has an upper surface (62), a lower surface (64) and a thickness (48) for receiving a substantial portion of the weight of a person and extending downward within water into a loaded position (68), such that the upper surface (62) of the elastic seat portion (28) when in the loaded position (68), is disposed substantially beneath an unloaded seat position (66) defined by the lower surface (64) when disposed in an unloaded position.

An image capturing lens including: in order from an object side, a first lens group having a negative refractive power; a stop; and a second lens group having a positive refractive power; the first lens group including, in order from the object side, a first lens in a meniscus shape having a convex surface which faces the object side and a negative refractive power, and a second lens in a meniscus shape having a convex surface which faces the object side and a positive refractive power, and the second lens group including, in order from the object side, a third lens in a double-convex shape having a positive refractive power, a fourth lens in a double-concave shape having a negative refractive power, and a fifth lens having a positive refractive power.

A low-distortion gallium nitride crystal substrate including low dislocation single crystal regions (Z) having a definite c-axis and a definite a-axis, C-plane growth regions (Y) having a c-axis and a-axis parallel to the c-axis and a-axis of the low dislocation single crystal regions (Z), voluminous defect accumulating regions (H) having a c-axis inverse to the c-axis of the low dislocation single crystal regions (Z) and an a-axis parallel with the a-axis of the low dislocation single crystal regions (Z), and 0.1/cm² to 10/cm² c-axis gross core regions (F) containing at least one crystal having a c-axis parallel to the c-axis of the low dislocation single crystal regions (Z) and an a-axis different from the a-axis of the low dislocation single crystal regions (Z).

A large resisting distortion combo-type bridge expansion joint, comprises fixed comb plate 2 and moveable comb plate 1 which are respectively disposed on the girder 10 where at the two sides of the bridge expansion joint, the moveable comb plate 1 has comb teeth 11 interdigitate with the comb teeth 21 of the fixed comb plate, characterized in that said moved comb plate 1 has a rotating shaft 8 the bottom of its second end, and the two ends of the rotating shaft 8 pivot in the shaft seat 7 which is directly or indirectly fixed on the girders 10. Compared with the prior art, this invention designs that around the second end of the moveable comb plate is rotatable, by which the moved comb plate will rotate round the girders when the girders have deflection distortion and the ends of the girders are raising or sinking. Therefore, the moved comb plate can keep flat to avoid damage of the expansion joint, and to ensure that the vehicle can pass safely and smoothly.

An electrochemical cell includes: a membrane electrode assembly: first and second reactant flow field plates for providing first and second reactant flow fields disposed on either side of the membrane electrode assembly. A first seal is disposed between the first reactant flow field plate and the membrane electrode assembly for impeding leakage of process fluids of the electrochemical cell. A first gas diffusion layer is disposed between the first reactant flow field plate and the membrane electrode assembly for diffusing reactant from the first reactant flow field to the membrane electrode assembly. The gas diffusion layer provides a peripheral support structure for supporting the membrane electrode assembly at a periphery between the first reactant flow field and the first seal to impede substantial distortion of the membrane electrode assembly between the first reactant flow field and the first seal.

The invention relates to a zoom lens that enables an optical path to be easily bent by a reflecting optical element, has a wide-angle design and high optical performance as represented by a high zoom ratio of about 3.4, is extremely slimmed down in the depth direction, and costs less. The zoom lens comprises a positive first lens group G1, a negative second lens group G2, a positive third lens group G3, a positive fourth lens group G4 and a negative fifth lens group G5. Upon zooming from the wide-angle end to the telephoto end, the first lens group G1 remains substantially fixed with respect to an image plane I, and at least the second G2 and the fourth lens group G4 move. The first lens group G1 includes a reflecting optical element for bending the optical path involved, and a portion of the first lens group G1 on an object side with respect to the reflecting surface has negative refracting power. The zoom lens satisfies condition (1) with respect to the focal length of the fifth lens group G5.

A workpiece chuck includes a thermal plate assembly which includes both heating and cooling capability. The heating element can be a resistive heater in a coiled configuration disposed in a plane. The cooling can be performed via a cooling fluid circulated through cooling tubes which are also disposed in a coiled configuration in a plane. The plane of the heating element and the cooling tubes can be the same plane, and that plane can be a center plane of the thermal plate assembly. By locating the heating and cooling in the same plane, uniform heating and cooling are achieved. Also, by locating the heating element and cooling tubes in the center of the thermal plate, distortions such as doming and dishing in the thermal plate are eliminated such that the wafer can be held extremely flat on the chuck. The heating element and cooling tubes are coiled in an interleaved fashion to provide uniform heating and cooling while allowing them to simultaneously occupy the same plane.

A damping ring is provided for isolating vibration between a fixing member and a structure. The damping ring includes a body and a protruding lip formed on the body. The body is installed on the structure and has a through hole opened along the central axis of the body, and the through hole is provided for the fixing member to be inserted therein. The protruding lip is formed on the edges of a opening of the through hole and surrounds the opening, and the protruding lip extends outwardly along the central axis of the body, and extends inwardly along the radial direction, so as to contact with the fixing member, such that a gap is formed between the fixing member and the body instead of directly contacting the fixing member with the body, thus vibration transmitted between the fixing member and the structure is cushioned and isolated.

A large resisting distortion and modularized comb-type bridge expansion joint, comprises at least two modules located parallel in the direction of a bridge's width, and each module includes a fixed comb plate (2) and a movable comb plate (1), which are respectively disposed on girders located at the two sides of the bridge expansion joint, said movable comb plate (1) crosses over the bridge expansion joint, both of said fixed comb plate (2) and said movable comb plate (1) have a plurality of comb teeth (22), (11) at their opposite ends, and the comb teeth (11) of said movable comb plate (1) interdigitate with the comb teeth (22) of said fixed comb plate (2) characterized in that the root of said movable comb plate (1) rotatably joints with a seat (5) fixed on the girders, and the comb teeth (22) of said fixed comb plate (2) rotatably joints with the root of said fixed comb plate (2), while, the middle of the comb teeth (22) of said fixed comb plate (2) is movably set on an underlay (6) fixed on the girders and can be shifted transversely relative to the underlay (6). In this invention, when the girders have transverse shift under the effect of the wind or other external forces, the movable comb plate and its comb teeth will rotate correspondingly and the comb teeth of the fixed comb plate will also rotate correspondingly, then the broken of the comb teeth will be avoided.

A delay circuit delays an input signal. Further, a level shift circuit, which has a variable level shift amount, is provided between the delay circuit and an OR circuit, thereby making it possible to adjust a time during which a logic of active of the delayed signal is kept. Moreover, the OR circuit performs an OR operation of the input signal and an output signal of the level shift circuit so as to obtain a signal of an OR logic, which drives a light emitting element. With this arrangement, the level shift amount is adjusted in response to a control signal externally supplied, in an optical transmitter arranged such that the input signal and output light emitted from the light emitting element with a delay in the emission, have the equal duty ratio. In this way, property unevenness among finished products of the light emitting element is cancelled out. Thus, it is possible to drive the light emitting element at a higher speed.

A liquid-ejecting head includes a pressure-generating chamber communicatively connected to a nozzle opening and also includes a piezoelectric transducer including a first electrode, a piezoelectric layer disposed on the first electrode, and a second electrode disposed on the piezoelectric layer. The first electrode contains platinum and titanium oxide with a rutile content of 76.5 to 100 mole percent.