316 results about "Waviness" patented technology

The present invention refers to a circuit for current and voltage control in a switching power supply controlled on the primary side, comprising a transformer with a primary-sided and a secondary-sided main winding, wherein energy pulses are transmitted from the primary side to the secondary side. Furthermore, a primary-sided switch switches on an off a primary current through the primary-sided main winding. A primary current comparator determines a switch-off time of the switch depending on the primary current. In order to reduce the load dependency of the output voltage, the control variable is variably amplified by a feedback network and additionally the control variable is reduced depending on the output load through a correction network. To reduce noise generated by the energy-rich pulse transmissions at low frequencies and the waviness of the output voltage, the control variable is fed back to the primary current comparator so that the duration during which the primary current flows through the primary-sided main winding is reduced differently. To reduce the susceptance to failure when determining the switch-on time, a comparator voltage depending on the control variable is generated as reference.

An electrostatic chuck for holding a wafer includes a ceramic plate of which one main surface is formed to work as a mounting surface for mounting the wafer, and electrostatic attraction electrodes formed on a lower surface of the ceramic plate or in the ceramic plate. A recess portion having a depth in a range of from 3 to 10 mum is formed on one main surface of the ceramic plate excluding an outer peripheral portion thereof. The waviness of a top face of the outer peripheral portion is set to 1 to 3 mum, a gas groove is provided to a peripheral portion of a bottom surface of the recess-portion bottom surface, and electrostatic attraction electrodes are disposed in the ceramic plate disposed below the bottom surface of the convex portion. In the electrostatic chuck thus constructed, even a wafer having a deformation such as a warped portion can be firmly attracted, a uniform temperature distribution over a wafer surface can be implemented, leakage of a heat-conductive gas can be suppressed, and moreover, high wafer-dechucking sensitivity can be exhibited.

A non-rotating anatomical-shaped breast implant having a front side with a smooth surface and a rear side with a textured surface. A smooth surface ripples or wrinkles little, if at all. Rippling or wrinkling of the implant may undesirably produce a visible or palpable waviness on the skin of the breast. A smooth surface is more likely to produce the look and feel of a natural breast. A rear side with a textured surface is desirable because tissue growth of the body, after the implant has been implanted, engages the textured surface to anchor the implant in place such that the front side with the smooth surface remains matched with the front side of the body and such that the anatomical-shaped breast implant with its tear drop shaped fullness remains at a natural position within the breast. The disclosure further includes a method for minimizing the rotation of an implant within the body and a method for making an implant envelope that has different thicknesses.

A polishing sheet which can improve waviness at a face of a material to be polished and which has a long life is provided. The polishing pad 1 has a polyurethane sheet 2 made of polyurethane resin. The polyurethane sheet 2 has a polishing layer which is disposed inside a surface layer and which is allowed to wear away by polishing and whose thickness is larger than a thickness of the surface layer. The polishing layer has an approximately uniform foam structure in a direction of the thickness of the polishing sheet 2 by being formed foams whose space volume is larger than that of foams formed at the surface layer and which are communicated so as to form a network by continuous holes whose diameter is smaller than that of the space volume of the foams formed at the polishing layer.

The present invention relates to one kind of core-shell type nanometer particle abrasive polishing liquid composition and its preparation process, and belongs to the field of surface polishing technology. The polishing liquid includes abrasive, oxidant and water, and features the abrasive is core-shell type nanometer composite particle abrasive, which has traditional abrasive, such as superfine alumina, silica, zirconia, cerium oxide, titania, ferric oxide, diamond or silicon nitride, as inner core, and hydrophilic segment polymer or compound containing organic functional group as shell. The polishing liquid is suitable for chemical and mechanical polishing of memory hard disc chip and aluminum magnetic disc, and has the advantages of reduced surface roughness and waviness, reduced surface mechanical damage and effective elimination of micro default.

A support which contains a base layer (B) composed of a biaxially stretched film of a thermoplastic resin containing an inorganic fine powder; and a surface layer (A) provided at least on one side of such base layer (B), which is composed of a biaxially stretched film of a thermoplastic resin having a three dimensional center plane average roughness of about 0.3 mum or below and a 60 degrees surface glossiness of about 80% or above is disclosed. A thermal transfer image-recording material using such support can produce a clear image having an excellent glossiness and no external waviness.

The present disclosure relates to a method for the manufacture of a workpiece having a corrected gear geometry and / or a modified surface structure, in particular by a hard finishing process, in particular generation grinding or honing. Provision is made in this respect that it is achieved by a direct generation of a wobble movement and / or of an eccentricity of the tool that a modification, in particular a profile modification or profile waviness, and / or a defined periodic flank waviness is generated on the active surface of the workpiece machined therewith.

A method for manufacturing a semiconductor device constituting an IGBT is provided that allows to manufacture the device using an inexpensive wafer and with high yields, and achieves low losses. Specifically, after an emitter electrode is formed, a reverse principal surface is polished to a specified thickness. The center line average height Ra of the polished surface is controlled to be not more than 1 .mu.m, and the filtered center line waviness Wca is kept within 10 .mu.m. The polished surface is selectively cleaned with chemicals-dissolved water to remove particles. To the cleaned surface, phosphorus ions are implanted for forming a field-stop layer and boron ions are implanted for forming a collector layer. The wafer is then put into a diffusion furnace and annealed at a temperature from 300.degree. C. to 550.degree. C. to form a field-stop layer and a collector layer. Finally, a collector electrode is formed.

The invention discloses a method for copying joint waviness by an artificial rock material and an experimental method. The method includes the following steps: firstly, measuring the joint surface contour line waviness by a three-dimensional laser scanning method; refining a graph and removing noise points from the graph by contour tracking, performing image scaling transformation and coordinate transformation on a joint contour line, and obtaining coordinate values of points on the contour line by an interpolation method; reading joint surface contour line data, digitalizing the joint surface contour line waviness, introducing the digitalized joint surface contour line waviness into a spark cutting control machine, processing a steel block by 2Cr13 alloy steel and making mortar joints; and laying joint mud or mineral clay with different thicknesses and water contents between the mortar joints, and carrying out a mechanical experiment of the joints. The method disclosed by the invention can be used for truly reflecting the physical states of filler rock masses containing joints, the influence of the joints to the strength and deformation properties of the rock masses can be researched by subsequent experiments, and the method is suitable for a variety of rock masses ranging from high-quality ones to broken ones.

There is provided an information recording medium and a method of manufacturing a glass substrate for information recording media as well as a glass substrate manufactured using the method, according to which the take-off height (TOH) of a HDD for example can be made low. The surface shape in a predetermined region of an information recording medium is measured using an optical interferometer or an atomic force microscope. The measured surface shaped is subjected to line analysis along the circumferential direction of the information recording medium. A calculation is made of the product PSD×f of PSD corresponding to a predetermined wavelength ν and the reciprocal of the predetermined wavelength ν. The maximum value of the calculated PSD is controlled to not more than a predetermined value. As a result, the TOH can be made low by reducing waviness which hinders the magnetic head of a HDD or the like from stably flying.

The invention discloses a metal creep forming die. The metal creep forming die comprises an ejector rod, a threaded rod, an ejector rod fixing plate, a threaded rod fixing plate, a reinforcing rib, a height adjusting cushion block and a molded surface base plate, wherein the ejector rod is arranged in a cylindrical hole of the ejector rod fixing plate; the threaded rod is arranged in a threaded hole of the threaded rod fixing plate and is used for controlling the height of the ejector rod to form the required molded surface array; the reinforcing rib is arranged at the bottom of the fixing plate so as to enhance deformation resistance of the die; the height adjusting cushion block is arranged at the bottom of the reinforcing rib so as to adjust the horizontal height of the die; one layer of molded surface base plate is paved above the ejector rod array and is used for transitioning the discrete dot matrix surface into the required smooth curved surface; and the molded surface base plate may be an aluminum plate, a steel plate or a steel aluminum composite plate. In the die provided by the invention, the molded surface base plate can contact with all the ejector rod dot matrixes, so that the waviness of a creep formed member is less than 0.005 and good member molded surface quality is achieved; and the die process cost caused by that a fixed curvature characteristic integrated type structure die and a rib plate type split structure die are required to be modified repeatedly is avoided, so that die trial cost can be greatly reduced.

Provided is a light reflecting plate capable of reducing glare of reflected light while maintaining high light reflectance by regular reflection. The light reflecting plate includes a base, a light reflecting layer that is formed on the base and made of silver or silver alloy, or aluminum or aluminum alloy, in which arithmetic average roughness (Ra) is 0.10 to 0.30 μm and arithmetic average waviness (Wa) is 0.30 to 2.50 μm on a surface of the light reflecting layer.

It is an object to provide a surface-treated electro-deposited copper foil which has a low profile at a level equal to or excellent than that of low-profile surface-treated electro-deposited copper foils that have conventionally been supplied to the market and in which waviness affecting the straight line performance of wiring is small, and a method for manufacturing the same. In order to achieve this object, in the surface-treated electro-deposited copper foil, the maximum waviness height (Wmax) of the bonding surface to be bonded with an insulation layer-constituting material to be 0.05 μm to 0.7 μm, the maximum peak to valley height (PV) to be 0.05 to 1.5 μm, and the surface roughness (Rzjis) to be 0.1 μm to 1.0 μm. The electro-deposited copper foil used for the manufacturing of this surface-treated electro-deposited copper foil is manufactured by using a sulfuric acid base copper electrolytic solution obtained by adding 3-mercapto-1-propanesulfonic acid or bis(3-sulfopropyl)disulfide, a quaternary ammonium salt polymer having a cyclic structure, and chlorine, and using a cathode having small surface roughness, under electrolysis conditions of carrying out continuous first-step electrolysis to n-th-step electrolysis at two or more different levels of electric current density.

The invention relates to a special-shaped composite fiber and a manufacture method thereof. A bundle of parallel special-shaped composite fibers is formed by clustering a plurality of double-component, special-shaped, composite and single fibers, wherein the cross section shape of the single and special-shaped fiber is non-round and is any one shape of an oval, a rectangle, a trapezoid, a triangle, a trefoil, a cross, a T shape and an H shape. The manufacture method comprises the following steps: adopting double-component spinning fused mass and utilizing a double-component and composite spinning machine, a parallel composite spinning component and a special-shaped hole spinneret plate to manufacture the parallel special-shaped composite fibers which can be directly prepared into FDY parallel special-shaped composite fibers or can be prepared into POY parallel special-shaped composite fibers and then be prepared into DT or DTY parallel special-shaped composite fibers with crimp property by post-processing technologies, such as traction or elasticizing, and the like. The spinning fused mass has two different characteristics; firstly, the two types of spinning fused mass are together extruded and solidified into fibers by spinneret orifices on the special-shaped hole spinneret plate of a parallel spinning component, and the fibers are drawn, extended and coiled into the parallel special-shaped composite fibers. The invention has the advantages of simple technology, obvious natural fiber simulation effect, convenient popularization and application, and the like, and the waviness and the cross section shape of the fibers are similar to natural fibers.

The invention discloses a gas sealing experimental device which comprises a sealed cavity, a driving system, a gas supply loop and a test system. The gas sealing experimental device is characterized in that the sealed cavity is vertically fixed on a bracket by a bolt; the driving system comprises a motor, a coupler, a bearing box and a spindle; the motor is fixed on the bracket by the bolt; the motor and the spindle are connected by the coupler; the gas supply loop comprises a compressor, a pneumatic pipe and a pressure regulation valve; the compressor is connected with a gas inlet of the sealed cavity through the pneumatic pipe; and the test system comprises an eddy current sensor, a moving ring positioning sheet, a flowmeter and a pressure sensor. Through adoption of the gas sealing experimental device, the sealed end surface gas leakage rate and the gas film thickness of various gas end surfaces can be measured on line. The measurement method of gas leakage rate is simple and easy to implement and has good dynamic response, the measurement of gas film thickness is not affected by the material of a seal ring, end surface width and the annular surface waviness of the seal ring, and revolving speed and pressure in the experiment process are adjustable.

An abrasive article having an array of abrasive members with an elastomeric support that permits each abrasive member to move independently in at least pitch and roll. Each abrasive member maintains a fluid bearing (air is the typical fluid) with the substrate. The abrasive members are capable of selectively engaging with nanometer-scale and / or micrometer-scale height variations and micrometer-scale and / or millimeter-scale wavelengths of waviness, on the surfaces of substrates. The spacing and pitch of the abrasive members can be adjusted to follow the topography of the substrate to remove a generally uniform layer of material; to engage with the peaks on the substrate to remove target wavelengths of waviness; and / or to remove debris and contamination from the surface of the substrate.

A method for manufacturing an acoustical stack for use within an ultrasound transducer comprises using a user defined center operating frequency of an ultrasound transducer that is at least about 2.9 MHz. A piezoelectric material and a dematching material are joined with an assembly material to form an acoustical connection therebetween. The piezoelectric material has a first acoustical impedance and *at least one of* an associated piezoelectric rugosity (Ra) and piezoelectric waviness (Wa). The dematching material has a second acoustical impedance that is different than the first acoustical impedance and at least one of an associated dematching Ra and dematching Wa. The piezoelectric and dematching materials have an impedance ratio of at least 2. The assembly material has a thickness that is based on the center operating frequency and at least one of the piezoelectric Ra, piezoelectric Wa, dematching Ra and dematching Wa.

A laser ablation method is used to polish a bearing surface of an automotive crankshaft. A laser ablation device generates a laser according to parameters such as wavelength, pulse duration, pulse repetition rate, and beam quality. The laser is applied to the surface of a rotating engine component, such as a crankshaft, as the component is rotated in order to polish the surface according to the parameters. The laser substantially improves tribological performance of the bearing surface by changing the waviness and form of the surface profile. Further, oil-retention reservoirs are formed in the surface. As a result, the friction coefficient of the crankshaft surface is reduced while the roughness of the crankshaft surface is maintained, reduced, or increased.

A system and method are provided that allows a speaker to provide real-time annotations to one or more displayed images during a presentation. The speaker inputs the annotations my manually identify a portion of the displayed image using an input mechanism such as a touch screen that is in communication with a presentation monitor and a control system that is controlling the presentation. The identified portions are annotated onto the displayed images using a adaptive color that is selected to provide optimum contrast with the existing colors in the displayed image. In addition to providing adaptive, contrasting colors for the annotations, imperfection such as waviness are removed from the identified portions to created corrected portions that are then annotated onto the presentation image. Annotation is accomplished through computer generated graphics or through the use of a motorized, controllable laser pointer.

A dressing bars for embedding abrasive particles into a substrate at a substantially uniform height. Spacing pads, hydrostatic and / or hydrodynamic fluid bearing (air is the typical fluid) maintains a constant spacing and attitude between the dressing bar and the substrate. The fluid bearing permits the dressing bar to maintain a desirable stiffness between the lapping plate and the dressing bar. The bar geometry and fluid bearing design permits the bar to mitigate or compensate for the micrometer-scale and / or millimeter-scale wavelengths of waviness on the substrate, while maintaining a substantially constant clearance to uniformly embed the abrasive particle into the substrate.

The present invention relates to the technology of manufacturing computer memory and hard disk. The polishing slurry contains abrasive, oxidant and water and is characterized by its water-soluble lubricant and polish balancing agent. The water-soluble lubricant is plyoxyethylenated fatly acid phosphate, plyoxyethylene fatty amide phosphate, fatty acid-polyol ester or their mixture and accounts for 0.2-20 wt%; and the polish balancing agent is water-soluble alcohol and accounts for 0.2-20 wt%. The polishing slurry can reduce the roughness and waviness of memory and hard disk surface to below 0.7 angstrom and eliminate effectively pit, lug, scratch and other faults.

The invention discloses an'involute gear waviness sample plate'. Based on the generation principle of an involute profile, a novel involute gear waviness sample plate is designed. Based on the gear mesh principle, according to the generation principle of the involute, the designed waviness is overlapped to an involute profile along the generation line direction of the involute; a plurality of harmonic waves can be overlapped on each gear surface according to the design aim; the wave lengths of the harmonic waves and the initial phase position are required to be calculated according to the gear waviness theory; the involute gear waviness sample plate overlaps the specific harmonic waves in a standard gear transmission error curve, finally the estimation of the filtering algorithm of a gear measuring instrument is realized, a complete measurement means for the gear noise theory is provided, and the gear standard sample plate system is perfected.

A method for manufacturing an acoustical stack for use within an ultrasound transducer comprises using a user defined center operating frequency of an ultrasound transducer that is at least about 2.9 MHz. A piezoelectric material and a dematching material are joined with an assembly material to form an acoustical connection therebetween. The piezoelectric material has a first acoustical impedance and *at least one of* an associated piezoelectric rugosity (Ra) and piezoelectric waviness (Wa). The dematching material has a second acoustical impedance that is different than the first acoustical impedance and at least one of an associated dematching Ra and dematching Wa. The piezoelectric and dematching materials have an impedance ratio of at least 2. The assembly material has a thickness that is based on the center operating frequency and at least one of the piezoelectric Ra, piezoelectric Wa, dematching Ra and dematching Wa.

Disclosed is a junction surface contact area and rigidity confirming method based on surface fitting. The junction surface contact area and rigidity confirming method based on the surface fitting includes: firstly, using confocal microscopy and three coordinate measuring to measure micro bulge morphology, external waviness and shape error of a mechanical junction surface, performing fitting on obtained point cloud data by using a binary high order function, and accordingly obtaining a final analysis formula of a contact surface; secondly, judging positions and contact directions of micro bulge contact points, then performing Hertz contact calculation on each single contact point, and calculating contact deformation and contact area under functions of force; finally, calculating overall contact area and contact rigidity of the contact surface so as to obtain total contact area and contact rigidity in each direction. Compared with a traditional analysis method, the junction surface contact area and rigidity confirming method based on the surface fitting has the advantage of approaching real morphology. Compared with a finite element method, the junction surface contact area and rigidity confirming method based on the surface fitting can enlarge the contact area which can be calculated.

There are provided a solder joint structure, a power module using the joint structure, a power module substrate with a heat sink and a method of manufacturing the same, as well as a solder base layer forming paste which is disposed and fired on a metal member to thereby react with an oxide film generated on the surface of the metal member and form the solder base layer on the metal member, capable of suppressing the occurrence of waviness and wrinkles on the surface of the metal member even at the time of loading the power cycle and heat cycle and improving the joint reliability with a joint member.

The invention relates to a manufacture method for alumina / silicon oxides compounding mill grain that includes the following steps: making alpha-Al2O3 dispersing liquid; adding alpha-Al2O3 and dispersing agent hexametaphosphate into deionized water, whisking to equal, adding dilute base and diluted acid solution to adjust the pH value to 9, taking ultrasound dispersing and ball milling dispersing; heating the temperature to 80-100 degree centigrade and adding Na2SiO3 and H2SO4 into the alpha-Al2O3 dispersing liquid, after reacting, aging for 2 hours, taking centrifugal separating, purifying, drying and gaining the product. The polishing fluid made from the product would obviously decrease the roughness and waviness of the surface after the hard disk basal piece and disc glass basal piece.

The invention relates to an external diameter milling processing method of coreless through-external circule milling bearing, continuously adjusting the center height of the workpiece to heighten milling precision and productivity. Its technical project: (1) external diameter milling procedure: taking the center height of the mill bed as reference to adjust the center height of a workpiece to 80mm, roughly milling twice-thrice up to the roughly milling size and eliminating circular error; (2) reprocessing workpiece: taking the center height of the mill bed to adjust that of the workpiece to 3-7 mm, the elliptical VDP is controlled in 2 mum and waviness controlled in 1.5mum; (3) after processed by the above two procedures, adjusting the center height of the workpiece again to 80mm with that of the mill bed as reference for milling, the diameter of the workpiece is milled off by 10mum, the 'multi-angle ' are removed by 25mum, and circular error is controlled within 1.5mum; adjusting the center height of the workpiece with the external diameter less than 80mm to 40mm. It ensures processing precision, prolongs service life of finished bearings and heightens the whole quality of bearing products.

A process for polishing a glass substrate, which enables to polish a glass substrate having a large waviness formed by mechanical polishing, to have a surface excellent in flatness, is provided. A process for polishing a glass substrate, comprising a step of measuring the surface profile of a mechanically polished glass substrate to identify the width of waviness present in the glass substrate, and a step of applying dry etching using a beam having a beam size in FWHM (full width of half maximum) value of at most the above size of waviness, to polish the surface of the glass substrate.