31 results about "Thermal expansion" patented technology

An image pickup device is disclosed that has little deformation caused by thermal expansion of a transparent resin for sealing an image pickup element. The image pickup device includes an image pickup element having a light receiving surface, a micro-lens for condensing incident light to the image pickup element, a first transparent plate disposed on the light receiving surface of the image pickup element with the micro-lens in between, a transparent resin that seals the image pickup element and the first transparent plate, and a second transparent plate disposed on the transparent resin to face the first transparent plate.

The invention refers to a micromechanical switching device including at least two contact elements (11, 12, 31, 32), which are provided at least partly movable relative each other and via thermal actuation can be closed and opened, whereby the contact elements (11, 12, 31, 32) at least partly are comprised of at least two materials (14, 15, 16, 17, 34-37) with essentially different thermal expansion coefficients. The contact elements (11, 12, 31, 32) at excitation are arranged to displace essentially in same level and in different directions.

A package board module wherein a semiconductor chip such as an LSI is mounted on the topside surface of a package board, and a package mounted module wherein the package board is mounted on the motherboard of a large-sized computer or the like. A stiffener for supporting the package board and/or a stiffener for supporting the motherboard each has a bimetal structure wherein a first member and a second member having mutually different thermal expansion coefficients are respectively adhered to each other, so as to cause the stiffeners to warp in harmony with the warpage of the package board and the motherboard caused by a temperature change, thereby preventing stress from arising in the solder-bonded portions.

A molded ceramic or glass ferrule has at least one longitudinal passage, which enables an optical fiber feed through, sealed into a metal housing with glass solder. The metal material in the housing has a slightly higher coefficient of thermal expansion (CTE) than the ferrule material and the sealing glass so that hermetic seal is maintained by a compression stress applied to the ferrule and sealing glass by the housing at operating conditions. When the housing has to be fabricated from a low CTE material, e.g. metal or ceramic, a metal sleeve and stress relief bracket is used to apply the compression stress.

The invention discloses a hardened ordinary cement paste thermal expansion coefficient multiscale predication method. The method comprises the following steps of: step A: dividing hardened ordinary cement paste into different scales according to microstructure composition, wherein the different scales comprise different typical phases; step B. acquiring the volume percentage composition of each phase in different scales of the hardened ordinary cement paste; and step C. sequentially calculating the thermal expansion coefficient of each scale of the hardened ordinary cement paste from the minimum scale by adopting an upward gradual homogenization method, wherein the thermal expansion coefficient of the maximal scale is the thermal expansion coefficient of the hardened ordinary cement paste. According to the invention, a hardened ordinary cement paste thermal expansion coefficient multiscale predication model is established according to cement and hydration product essential attributes as well as cement paste microstructure composition and development principle, so that the relationship between the cement paste microstructure and macro-properties is established, and the problems of multiple influence factors on the macro-properties of cement-based materials and high discretization of test data are solved essentially.

The invention relates to image sensor packaging piece and its optical glass and processing method. The packaging piece includes chip carrier, annular bearing, sensor chip, and optical glass. It includes the following steps: processing grinding before cutting the whole optical glass into many monomers; forming many optical glass monomers with at least one brim rough surface to adhere on the sensor chip bearing to reduce thermal expansion coefficient difference, avoid delaminating caused by thermal stress, prevent moisture and impurity from invading to ensure sensor chip accepting optical signal capacity.

The invention relates to a thermal expansion valve, belonging to the technical field of refrigeration control. The thermal expansion valve comprises an upper valve body, a lower valve body, a transmission rod and a valve core, wherein the upper valve body is provided with a first cavity, a second cavity and a pair of air return pipes; the lower valve is fixedly connected with the upper valve bodyand is provided with a pair of throttling pipes; the displacement of the transmission rod varies due to the influence of the temperature/pressure of a temperature sensing component; the valve core isarranged in the first cavity, and the displacement of the transmission rod controls the movement of the valve core so as to control the opening degree of a throttle port. The thermal expansion valve is characterized in that the directions of a refrigerant flowing across the throttle port are the same when the thermal expansion valve is in a forward throttling state and a backward throttling state. The invention overcomes the difference between forward throttling and backward throttling in the prior art, and can simultaneously prevent the refrigerant from generating nonuniform impact on the transmission rod during the throttling process, thus, the thermal expansion valve not only can increase the movement reliability of the transmission rod, but also can obviously reduce noise.

The invention relates to the field of logistics articles, in particular to a PCB non-metallic material steel-plastic compound plate tray, a preparing production line and a preparing method. The tray is formed by sequentially arranging a first steel-plastic compound plate, a supporting layer and a second steel-plastic compound plate from top to bottom; the supporting layer is composed of a plurality of vertically-arranged stand columns; the first steel-plastic compound plate is fixedly connected with the top ends of the stand columns; the second steel-plastic compound plate is fixedly connected with the bottom ends of the stand columns; and the first steel-plastic compound plate and the second steel-plastic compound plate are each formed by sequentially arranging a first plastic layer, a reinforcing layer and a second plastic layer from top to bottom. The produced tray can be recycled many times, resources are saved, the requirement of the 'green and environment-friendly industry' is met, the environment is protected, the tensile strength is high, the bending resistant performance is high, deformation is not likely to be caused, the deformation amount caused by the temperature effect is small, the shrinkage rate of thermal expansion and cold shrinkage is low, the number of using and circulating times is large, waterproofness is good, fumigation is not needed, and the service life is long.

The invention provides a microfluidic chip and a microfluidic drive and control system thereof, and belongs to the technical field of micromachine. The microfluidic chip includes a control layer, a PDMS film layer, a fluidic channel layer and a glass substrate. The fludic channel layer is provided with one main channel and three sorting channels; a switch of the sorting channels are controlled bya thermal expansion micovalve of the control layer; the microfluidic drive and control system includes an observing device and a fluidic control device. According to the microfluidic chip and the microfluidic drive and control system thereof provided by the invention, the microfluidic system completely solves the technical problem such as microfluidic focusing, microfluidic driving and microfluidic detection. The designed sorting system can automatically sort different detected products. The designed fluidic control device can replace a plurality of existing microfluidic driving pumps. The solution promotes scientific researches on microfluidic chips and microfluidic driving technologies.

The invention provides a paving construction process for roofs of a steel framework composite building. The paving construction process comprises the steps that a roof framework and roof panels are prepared, the roof panels are bond to the bottom surface and the top surface of the roof framework, concrete is prepared, the roof framework is filled with the concrete, the concrete is vibrated, a supporting framework is erected on the building, the supporting framework is paved with the roofs of the steel framework composite building, seam filling pipes are plugged in roof plate seams between every two adjacent roofs of the steel framework composite building, the roofs of the steel framework composite building and the seam filling pipes or the supporting framework are welded, and roof plate seams are filled with filler. By the adoption of the technical scheme, the concrete filling the roofs of the steel framework composite building is vibrated, the internal and external temperature difference is reduced, after paving and filling with the seam filling pipes, the filler is used for filling to enable the roof plate seams to be kept consistent, the thermal expansion rate of the building roof is kept uniform, twisting and deformation are avoided, and the roof waterproof grade and the construction quality are improved.

The invention relates to a halogen free thermosetting resin composition, and a prepreg, a laminated board, a metal foil layer-coated laminated board and a printed circuit board using the halogen freethermosetting resin composition. Based on 100 weight parts of an organic solid matter, the halogen free thermosetting resin composition comprises the following components: (A) 25 to 55 weight parts ofphosphorus-containing epoxy resin, (B) 10 to 35 weight parts of styrene-maleic anhydride polymer, and (C) 20to 50 weight parts of biphenol fluorene benzoxazine resin. The laminated board which is prepared by adopting the halogen free thermosetting resin composition has high glass transition temperature, low low dielectric constant, low dielectric loss factor, low thermal expansion coefficient, high heat resistance, low water absorption, good flame retardance, processability and chemical resistance.

The invention discloses an aluminum alloy window installation structure, which comprises hollow glass, sealing silica gel, sealing gasket, glass groove, frame, waterproof sealing strip, drainage groove, slide rail shaft, slide rail, window frame protection device, Outlet cover, protective cover, pressure plate, hollow glass is embedded and connected in the glass groove, the upper end of the frame is provided with a sealing gasket, the waterproof sealing strip is embedded and connected in the protective cover, the slide rail shaft and the slide rail are an integrated structure. An aluminum alloy window installation structure. When using an aluminum alloy window, the impact force during installation can be slowed down by the buffer plate, and the foam insulation board can be fixed by anchors to prevent it from falling off. The infiltration of water vapor in weather can prevent internal corrosion. It can insulate aluminum windows to prevent sudden changes in temperature from thermal expansion and contraction that cause frame deformation. It can also reduce material corrosion in wet weather and reduce the maintenance of aluminum windows.

The invention provides a magnetic disk that solves (1) a problem of cross-talk that cannot be solved even by an existing thermally assisted recording method or a discrete method (DTM or the like), (2) a problem of surface flatness, which an existing embedding type DTM or the like has, and (3) a problem of a difference in thermal expansion coefficient between materials when a thermally assisted method is applied to the DTM, and that (4) does not necessitate a special medium structure, and is excellent in a surface flatness and economically and functionally high in realizability. A DTM manufactured by ion implantation is excellent in the surface flatness, and can solve the cross-talk problem by conducting the thermally assisted recording at a temperature between a Curie temperature (Tcn) of a portion where ions are implanted (non-recording region) and a Curie temperature (Tcr) of a portion where ions are not implanted (recording region).

The invention discloses an adaptive compensation device for horizontal imaging field pitch angle of laser radar. The adaptive compensation device comprises: a metal frame; a turntable fixed to the metal frame; a spindle having one end fixed to the turntable through a fixing point and configured to be capable of rotating around the fixing point, wherein the upper portion of the other end of the spindle is configured to hold a laser, and the spindle is used for rotating to adjust imaging field pitch angle of the laser; a thermal expansion rod having the upper end fixed to the metal frame and thelower end abutted to the spindle, wherein a thermal expansion coefficient of the thermal expansion rod is greater than that of the metal frame; a spring having two ends fixed between the lower portion of the other end of the spindle and the metal frame. The metal frame and the thermal expansion rod have a great thermal expansion coefficient difference; upon a temperature change, deformation of the thermal expansion rod may push the spindle so as to drive a laser beam emitted by the laser on the spindle to rotate opposite to a displacement of the pitch angle, and thermo-optic drift due to temperature gradient is adaptively compensated.

The invention relates to the field of hardware tools, in particular to a separating preventing hard alloy maintenance tool. The separating preventing hard alloy maintenance tool comprises a communicating rod, a base metal main body, an inclined surface, penetration mounting holes and alloy components; the lower part of the communicating rod is connected with the base metal main body; the inclined surface is arranged at the edge of the upper part of the base metal main body; the penetration mounting holes are formed in the inclined surface; the alloy components are embedded into the penetration mounting holes; each alloy component comprises a hollow sleeve, a super-hard core body and a connecting shaft assembly; each super-hard core body is arranged in the corresponding hollow sleeve in a sleeving manner and is fixedly connected with the corresponding connecting shaft assembly. According to the separating preventing hard alloy maintenance tool, through the arrangement of the penetration mounting holes and the hollow sleeves, the super-hard core bodies can be subjected to dual protection, and the problem of separating of the super-hard core bodies caused by the difference of thermal expansion coefficients is prevented; through the arrangement of the inclined surface, direct impact pressure in a furnace is favourably transferred to one side so as to reduce a pressure coefficient.

The invention discloses an expansion ring and sealing brush combined internal combustion wave rotor and belongs to the technical field of sealing of aero-engine combustors. The expansion ring and sealing brush combined internal combustion wave rotor is characterized by mainly comprising a wave rotor body, end caps, an internal expansion ring, an external expansion ring, sealing brushes and the like, wherein the internal expansion ring and the external expansion ring prevent high-pressure gases in the wave rotor body from outleakage; the sealing brushes can prevent the high-pressure gases from leakage to adjacent wave rotor channels; and the internal expansion ring, the external expansion ring and the sealing brushes are all made of an elastic wear-resistant material, thermal expansion of a system can be accommodated to a certain degree, and the wave rotor cannot get stuck in the rotating process. The combined sealing method can simultaneously be used for sealing other multi-directional leakage systems in the aviation field.

The invention relates to hardware fittings for electric power circuit connection, in particular to a nested reinforcing yoke plate and a processing method thereof. No riveting and welding are required. The nested reinforcing yoke plate comprises a triangular steel plate and a steel jacket. The steel jacket is nested into the triangular steel plate. The triangular steel plate and the steel jacket are in nested connection, and the problems that welding workloads are high, acid returns from welded joints and the yoke plate strength is lowered by the adoption of the welding mode in the prior art are solved. By means of nested connection, the problems that the base plate strength is lowered and riveting is unfirm due to riveting are also solved. After nesting with the thermal expansion principle is completed, the triangular steel plate and the steel jacket are in interference fit, so that the yoke plate strength is reinforced, and the yoke plate is made more durable in use. By the adoption of the nested connection, the processing method is simpler and faster, cost is reduced, and processing quality can be controlled more easily.

A method for breaking large steel part by expanding when heated and contracting whee cooled includes heating and cooling. Its apparatus is composed of a heating furnace with gate, a conveying plate, and a cooling water pool.

The invention discloses an alloy type silver mirror backboard. The silver mirror backboard comprises a parabolic profiled plate which is formed by punching an alloy with the thermal expansion performance similar to that of glass, and a plurality of side baffle sheets which are fixedly arranged on the two sides of the profiled plate; inwards bent limiting parts are formed at the upper ends of the side baffle sheets; and a plurality of reinforcing ribs are punched on the arc-shaped profiled plate. According to the silver mirror backboard, the aluminum alloy is adopted as the backboard in a breakthrough mode, and the metal has better stability and machinability compared with a previous material, so that the service life of the backboard is greatly prolonged; and the side baffle sheets are added to the side edges, for example, the six side baffle sheets are symmetrically arranged on the two sides, so that the positioning effect of a silver mirror is effectively improved and the adverse phenomena such as side upwarping and the like of the silver mirror can be prevented.