Patent application number | Description | Published |
20110049602 | NON-VOLATILE MEMORY SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD THEREOF - A gate insulating film layer, a floating gate electrode layer, an interelectrode insulating film layer, and a control gate electrode layer are stacked on a silicon substrate, and the control gate electrode film layer is etched to form a plurality of the control gate electrodes having the same width with the width of the memory cell. An arbitrary of the plurality of control gate electrodes is a transistor unit, and an interelectrode insulating film, a floating gate electrode, and a gate insulating film are formed in the transistor unit. In the transistor unit, a conductive material is buried into a contact hole to form a transistor, the contact hole is formed along the plurality of control gate electrodes. | 03-03-2011 |
20110239096 | DATA MEMORY DEVICE AND METHOD OF PROGRAMMING TO THE SAME - A memory element array includes plural memory elements capable of storing M-value data (M is a natural number not smaller than 2). Among first to M-th data, the first data gives a largest physical impact on memory elements. | 09-29-2011 |
20120020160 | NONVOLATILE SEMICONDUCTOR MEMORY DEVICE AND WRITING METHOD THEREOF - A control circuit is configured to execute a writing operation for giving a second threshold voltage distribution to a plurality of memory cells formed along one word line. In the writing operation, the control circuit performs a writing operation by executing a voltage applying operation in memory cells to be given the second threshold voltage distribution. While the control circuit executes a voltage applying operation in memory cells to be maintained in an erased state, thereby moving a first threshold voltage distribution to a positive direction to obtain a third threshold voltage distribution representing the erased state. | 01-26-2012 |
20120106246 | NON-VOLATILE SEMICONDUCTOR MEMORY DEVICE, METHOD OF WRITING THE SAME, AND SEMICONDUCTOR DEVICE - A control circuit is configured to be able to perform a rough write process, a foggy write process, and a fine write process. The rough write process moves, for a memory cell to be provided with a plurality of second threshold voltage distributions, a first threshold voltage distribution in the positive direction to generate a third threshold voltage distribution. The foggy write process does not move, for a memory cell finally to be provided with first data, the third threshold voltage distribution, and moves, for a memory cell finally to be provided with second data different from the first data, the first threshold voltage distribution or the third threshold voltage distribution in the positive direction to generate a plurality of fourth threshold voltage distributions. The fine write process moves the fourth threshold voltage distributions in the positive direction to generate the second threshold voltage distributions. | 05-03-2012 |
20120236636 | NON-VOLATILE SEMICONDUCTOR STORAGE DEVICE - A non-volatile semiconductor storage device according to an embodiment includes a memory cell array and a control circuit configured to execute a read operation. The control circuit refers to data of a reference memory cell which is adjacent to a selected memory cell and in which data is written after a data write operation on the selected memory cell. The control circuit applies a first read pass voltage to a non-selected word line adjacent to the selected word line, when the data of the reference memory cell is data causing the shift of the threshold voltage of the selected memory cell. The control circuit applies a second read pass voltage lower than the first read pass voltage to the non-selected word line, when the data of the reference memory cell is data not causing the shift of the threshold voltage of the selected memory cell. | 09-20-2012 |
20120236637 | NON-VOLATILE SEMICONDUCTOR STORAGE DEVICE - A non-volatile semiconductor storage device according to one embodiment includes a memory cell array that has NAND cell units in which a plurality of memory cells are connected in series, the control gate of each of the plurality of memory cells being connected to a word line, and a control circuit configured to execute a write operation by applying a write voltage to the word line. The control circuit is configured to execute a correction write operation accompanied by the write operation and executed on a selected memory cell, when a threshold voltage of data written in a reference memory cell is an erase level, the reference memory cell being the memory cell adjacent to the selected memory cell and in which the data is written after the write operation on the selected memory cell. | 09-20-2012 |
20120243324 | NON-VOLATILE SEMICONDUCTOR STORAGE DEVICE - A non-volatile semiconductor storage device according to one embodiment includes a memory cell array that has NAND cell units in which a plurality of memory cells connected in series, the control gate of each of the plurality of memory cells being connected to a word line, and a control circuit configured to execute a write operation by applying a certain write voltage to the word line multiple times to set a threshold voltage of the memory cell to a value corresponding to data. The control circuit is configured to control the write voltage such that the write voltage is increased by a first step-up voltage when the write voltage is repeatedly applied in a first period after the write operation starts, and the write voltage is increased by a second step-up voltage lower than the first step-up voltage in a second period after the first period. | 09-27-2012 |
20130070532 | NONVOLATILE SEMICONDUCTOR MEMORY DEVICE - A nonvolatile semiconductor memory device according to an embodiment includes a control unit configured to perform a control of repeating a program operation, and a step-up operation, the program operation being an operation of applying a program pulse voltage to a selected memory cell and applying an intermediate voltage less than the program pulse voltage to first and second non-selected memory cells adjacent to the selected memory cell, and the step-up operation being an operation of increasing the program pulse voltage by a first step-up value. For a first period, the control unit maintains the intermediate voltage to be a constant value. For a second period, the control unit controls the step-up operation such that the intermediate voltage is increased by a second step-up value, and determines the first step-up value on the basis of the second step-up value. | 03-21-2013 |
20130077404 | NONVOLATILE SEMICONDUCTOR MEMORY DEVICE - A nonvolatile semiconductor memory device according to one embodiment includes: memory cells; word lines connected to the memory cells; and a control circuit configured to control a data read operation. When controlling the data read operation, the control circuit applies one of read voltages to a selected word line, applies a first read pass voltage to a first non-selected word line connected to one of data-written memory cells, and applies a second read pass voltage to a second non-selected word line connected to a non-written memory cell. Each of the read voltages is set to a voltage between two threshold voltage distributions. The first read pass voltage is set so that the data-written memory cells become conductive. The second read pass voltage is set so as to be lower than a highest read voltage, the highest read voltage being the highest voltage among the read voltages. | 03-28-2013 |
20130088924 | NONVOLATILE SEMICONDUCTOR MEMORY DEVICE AND METHOD OF DATA WRITE THEREIN - A bit line is electrically connected to one end of a current path of a memory cell. A word line is commonly connected to the memory cells arranged in a direction intersecting the bit line. A control circuit executes a write operation for applying a write voltage to the word line so shift a threshold voltage of the memory cell to be data written that the threshold voltage of the memory cell to be data written reaches a certain threshold voltage. During the write operation, the control circuit, while applying a gradually rising write voltage to the word line, gradually changes a voltage applied to the bit line based on a relationship between the threshold voltage of the memory cell to be written and a number of times of the write voltage applications. | 04-11-2013 |
Patent application number | Description | Published |
20100052173 | SEMICONDUCTOR DEVICE AND SEMICONDUCTOR DEVICE MANUFACTURING METHOD - A first impurity diffusion layer in a memory cell portion and a second impurity diffusion layer in a peripheral circuit portion are provided in a surface of a semiconductor substrate and having upper faces substantially flush with each other. First and second insulating films are formed to cover the upper faces of the impurity diffusion layers, and having substantially uniform film thicknesses. A first metal plug is formed in the insulating films, and connected to the first impurity diffusion layer. A second metal plug is formed in the first insulating film, to have a lower height than the first metal plug, and is connected to the second impurity diffusion layer. A first metal interconnection is connected to an upper end portion of the first metal plug, and having an upper face embedded in and flush with the second insulating film. A second metal interconnection is connected to an upper end portion of the second metal plug, and having an upper face embedded in and flush with the second insulating film. | 03-04-2010 |
20120250419 | METHOD OF CONTROLLING NONVOLATILE SEMICONDUCTOR MEMORY DEVICE - In one embodiment, method of controlling a semiconductor nonvolatile memory device includes determining data written to an adjacent memory cell which is adjacent to a selection memory cell in memory cells configured as a matrix, the selection memory being selected by a program operation for writing the data to the selection memory, and writing the data to the selection memory with controlling an amount of charges injected into the selection memory based on a result of determining the data. | 10-04-2012 |
20130015518 | SEMICONDUCTOR MEMORY DEVICEAANM SATO; HiroyasuAACI Kanagawa-kenAACO JPAAGP SATO; Hiroyasu Kanagawa-ken JPAANM NISHIHARA; KiyohitoAACI Kanagawa-kenAACO JPAAGP NISHIHARA; Kiyohito Kanagawa-ken JPAANM NAWATA; HidefumiAACI Kanagawa-kenAACO JPAAGP NAWATA; Hidefumi Kanagawa-ken JPAANM ICHIGE; MasayukiAACI Kanagawa-kenAACO JPAAGP ICHIGE; Masayuki Kanagawa-ken JPAANM OHBA; RyujiAACI Kanagawa-kenAACO JPAAGP OHBA; Ryuji Kanagawa-ken JP - In general, according to one embodiment, a semiconductor memory device includes active areas extending in a first direction, tunnel films provided on the active areas, floating gate electrodes provided on the tunnel films, an interelectrode insulating film provided on the floating gate electrodes and extending in a second direction, a control gate electrode provided on the interelectrode insulating film and extending in the second direction, a lower insulating portion provided between the active areas, between the tunnel films, and between the floating gate electrodes adjacent in the second direction, and an upper insulating portion provided between the lower insulating portion and the interelectrode insulating film. The lower insulating portion includes a void. Relative dielectric constant of the upper insulating portion is higher than that of the lower insulating portion. Relative dielectric constant of the interelectrode insulating film is higher than that of the upper insulating portion. | 01-17-2013 |
Patent application number | Description | Published |
20120310458 | VEHICLE, METHOD AND DEVICE FOR CONTROLLING ENGINE - A vehicle provided with a motor generator as a driving source includes a battery to supply electric power to the motor generator, an engine, and an ECU to control the vehicle in one of a CS mode and a CD mode in which opportunity for operation of the engine is limited compared to in the CS mode. The ECU controls the engine in accordance with a condition different from a condition used to control the engine in the CS mode, if the engine is started at least due to decrease in a state of charge of the battery while the vehicle is controlled in the CD mode. | 12-06-2012 |
20130151118 | AIR-FUEL RATIO CONTROL APPARATUS, AND CONTROL METHOD, OF HYBRID POWER UNIT - The invention relates to an air-fuel ratio control apparatus of a hybrid power unit that selectively executes a first mode in which a ratio of a period during which an internal combustion engine is operated is relatively small, and a second mode in which the ratio of the period during which the internal combustion engine is operated is relatively large. This air-fuel ratio control apparatus executes a target air-fuel ratio correction when a difference among air-fuel ratios in a plurality of combustion chambers exists or is greater than a predetermined difference. An air-fuel ratio correction amount that is a correction amount for the target air-fuel ratio by the target air-fuel ratio correction is set according to whether operational control of the internal combustion engine according to the first mode is being executed or whether operational control of the internal combustion engine according to the second mode is being executed. | 06-13-2013 |
20130304291 | VEHICLE, METHOD AND DEVICE FOR CONTROLLING VEHICLE - A vehicle provided with a motor generator as a driving source includes an engine and a catalyst for purifying gas exhausted from the engine. The engine is controlled in one control mode of a CS mode and a CD mode in which opportunity for operation of the engine is limited compared to in the CS mode. In the CS mode, the temperature of the catalyst is increased to be equal to or higher than a prescribed activating temperature. The temperature of the catalyst is increased to be higher than the activating temperature before the control mode is changed from the CS mode to the CD mode. | 11-14-2013 |
Patent application number | Description | Published |
20150175008 | VEHICLE - Vehicle is configured to supply power to outside of a vehicle. Vehicle includes an engine, a battery, a first MG configured to generate power with use of motive power of the engine, a switching unit configured to switch power supplied to outside of the vehicle between power generated by the first MG and power stored in the battery, an ECU configured to control the switching unit, and a detection unit configured to allow the ECU to determine whether or not the vehicle is located indoors. When the ECU determines that the vehicle is located indoors based on an output from the detection unit, it controls the switching unit so that the power supplied to outside of the vehicle to be switched from power generated by the first MG to power stored in the battery. | 06-25-2015 |
20150344023 | HYBRID VEHICLE - A control unit for a hybrid vehicle determines whether warming of an engine is insufficient in an outside electric power feed mode. When the warming of the engine is insufficient, it is determined whether current time is in an initial period of electric power feed. When the current time is in the initial period of the electric power feed, only electric power of an electric storage device is supplied to the outside in a state that the engine is off. When the current time is not in the initial period of the electric power feed, the engine is turned on, and only electric power generated in a motor is supplied to the outside. When the warming of the engine is sufficient, the electric power generated in the motor, the electric power of the electric storage device, or both of them are supplied to the outside. | 12-03-2015 |
20160052508 | HYBRID VEHICLE AND CONTROL METHOD THEREFOR - A hybrid vehicle includes an engine; a motor, a catalyst used to purify exhaust gas of the engine, and an ECU configured to control the engine and the motor according to an output request of the hybrid vehicle, execute a target engine output keeping control for controlling an engine output such that the, target engine output keeps at a predetermined value during warm-up of the catalyst, and set an engine speed to a first engine speed when the target engine output keeping control is executed, the first engine speed being lower than a lower limit engine speed at which the engine is operated without executing the target engine output keeping control. | 02-25-2016 |
Patent application number | Description | Published |
20090124024 | OPTICAL-WAVEGUIDE SENSOR CHIP, METHOD OF MANUFACTURING THE SAME, METHOD OF MEASURING SUBSTANCE, SUBSTANCE-MEASURING KIT AND OPTICAL-WAVEGUIDE SENSOR - An optical-waveguide sensor chip includes an optical waveguide having a first substance immobilized on the surface thereof, the first substance being specifically reactive with an analyte substance, and fine particles dispersed on the optical waveguide and having a second substance immobilized on the surface thereof, the second substance being specifically reactive with the analyte substance. | 05-14-2009 |
20110236266 | OPTICAL SENSOR - According to one embodiment, an optical sensor includes an optical waveguide module and a specimen area. The specimen area is provided adjacent to the optical waveguide module, and is configured to hold a specimen. The specimen area includes a sensing area and a precipitation area. An optical change occurs in the sensing area. A precipitate of the specimen is precipitated in the precipitation area. The precipitation area is placed at a different position from a position of the sensing area which is attached to the optical waveguide module. | 09-29-2011 |
20120213669 | OPTICAL-WAVEGUIDE SENSOR CHIP, METHOD OF MANUFACTURING THE SAME, METHOD OF MEASURING SUBSTANCE, SUBSTANCE-MEASURING KIT AND OPTICAL-WAVEGUIDE SENSOR - An optical-waveguide sensor chip includes an optical waveguide having a first substance immobilized on the surface thereof, the first substance being specifically reactive with an analyte substance, and fine particles dispersed on the optical waveguide and having a second substance immobilized on the surface thereof, the second substance being specifically reactive with the analyte substance. | 08-23-2012 |
20140105789 | OPTICAL-WAVEGUIDE SENSOR CHIP, METHOD OF MANUFACTURING THE SAME, METHOD OF MEASURING SUBSTANCE, SUBSTANCE-MEASURING KIT AND OPTICAL-WAVEGUIDE SENSOR - An optical-waveguide sensor chip includes an optical waveguide having a first substance immobilized on the surface thereof, the first substance being specifically reactive with an analyte substance, and fine particles dispersed on the optical waveguide and having a second substance immobilized on the surface thereof, the second substance being specifically reactive with the analyte substance. | 04-17-2014 |
Patent application number | Description | Published |
20090021847 | OPTICAL ELEMENT POSITIONING APPARATUS, PROJECTION OPTICAL SYSTEM AND EXPOSURE APPARATUS - The apparatus includes a holder holding an optical element, a back plate supporting the optical element via the holder, a mechanism moving the optical element in a six-degree-of-freedom, a base plate supporting the back plate via the mechanism, and six displacement sensors disposed on the base plate and measuring displacement amounts of different points on the optical element. The displacement sensors includes three ones measuring them in a first direction, one measuring it in a second direction, and two ones measuring them in a third direction. The apparatus further includes a transformation processor transforming the six measured displacement amounts into displacement amounts of the optical element in the six-degree-of-freedom, a calibration processor calibrating the transformed displacement amounts, and a controller outputting command values to the displacing mechanism based on differences between the calibrated displacement amounts and target displacement amounts of the optical element. | 01-22-2009 |
20100165313 | MIRROR SUBSTRATE, MIRROR, EXPOSURE APPARATUS, DEVICE MANUFACTURING METHOD, AND MIRROR MANUFACTURING METHOD - In a light-transmitting mirror substrate having an axisymmetrical aspherical surface, a surface of the mirror substrate on a side opposite to the axisymmetrical aspherical surface is inclined with respect to an axis of symmetry of the axisymmetrical aspherical surface. | 07-01-2010 |
20100321803 | Optical Element Positioning Apparatus, Projection Optical System and Exposure Apparatus - An optical element is moved in six-degrees-of-freedom. Three first displacement sensors are disposed on a base plate and measure respective displacement amounts of three mutually different points on the optical element in a first direction. A second displacement sensor measures a displacement amount of one point on the optical element in a second direction. Two third displacement sensors measure respective displacement amounts of two mutually different points on the optical element in a third direction. A transformation processor transforms the six measured displacement amounts A calibration processor calibrates the transformed displacement amounts with a calibration matrix of which coefficients are previously obtained to calibrate the displacement amounts in the six-degrees-of-freedom, which have errors due to measurement errors of the displacement sensors. A controller outputs command values based on differences between the calibrated displacement amounts and target displacement amounts. | 12-23-2010 |
20120045723 | VIBRATION ISOLATION DEVICE, EXPOSURE APPARATUS, AND DEVICE MANUFACTURING METHOD USING SAME - The vibration isolation device of the present invention includes a first position feedback control system including a reference body system that is fixed to an object to be isolated from vibration and includes a reference body; a first driving unit that drives the object with respect to a base; and a first compensator that calculates a command value to the first driving unit based on position information obtained from the reference body system. Also, the reference body system includes a second position feedback control system including a second driving unit that drives the reference body with respect to the object; a first measuring unit that measures the position of the reference body relative to the object; and a second compensator that calculates a command value to the second driving unit based on position information obtained from the first measuring unit. Here, the second compensator is a PD compensator. | 02-23-2012 |
20120105820 | VIBRATION CONTROL APPARATUS, LITHOGRAPHY APPARATUS, AND METHOD OF MANUFACTURING ARTICLE - A vibration control apparatus includes a first spring mechanism to support a first object as part of a first system. To control vibration of the first object, a first actuator applies a force to the first object via a command value generated by a first computing based on an output of a detection system. The detection system includes a second spring mechanism to support a second object as part of a second system. A third spring mechanism supports a third object as part of a third system. The first displacement detector detects displacement of the third object relative to the second object. The third object is prevented from being displaced relative to the second object. A second natural frequency of the second system is higher than a first natural frequency of the first system, and a third natural frequency of a third system is higher than the first natural frequency. | 05-03-2012 |
20120314050 | IMAGING APPARATUS AND CONTROL METHOD THEREFOR - An imaging apparatus comprises: a holding unit that holds a subject; a surface profile measuring unit that measures a surface profile of the subject; an imaging unit that adjusts an imaging plane according to the surface profile measured by the surface profile measuring unit and performs imaging of the subject; and a specifying unit that specifies a presence region in which an imaging object is present from an entire region of the subject. The surface profile measuring unit measures only the surface profile of the presence region specified by the specifying unit. | 12-13-2012 |
20130147939 | IMAGE ACQUISITION APPARATUS AND METHOD FOR ADJUSTING IMAGE ACQUISITION APPARATUS - An image acquisition apparatus includes a test object stage that holds a test object, a measuring unit that acquires surface profile information of the test object, and a microscope unit that includes an objective optical system that forms an image of the test object and an image pickup element that captures the image of the test object formed by the objective optical system. The test object stage is movable between a measurement position of the measuring unit and a imaging position of the microscope unit. The measuring unit acquires first stage inclination information of the test object stage. At the imaging position, the test object stage adjusts an orientation thereof on the basis of a relationship between the surface profile information and the first stage inclination information. | 06-13-2013 |
20150153659 | VIBRATION REDUCTION APPARATUS, LITHOGRAPHY APPARATUS AND METHOD OF MANUFACTURING ARTICLE - The present invention provides a vibration reduction apparatus which reduces vibration of a first object supported on a base, the apparatus comprising a driving unit arranged between the base and the first object and configured to drive the first object, a reference system including a second object, and a control system including a detector configured to detect a relative distance between the first object and the second object, a compensator configured to control the driving unit such that the relative distance comes close to a target distance, and a high-pass filter configured to attenuate a signal in a predetermined frequency band in a path extending from the detector to the driving unit. | 06-04-2015 |
20150268566 | VIBRATION REDUCTION APPARATUS, LITHOGRAPHY APPARATUS, AND METHOD OF MANUFACTURING ARTICLE - The present invention provides a vibration reduction apparatus which reduces a vibration of a target object supported on a base, comprising a first object supported by a first elastic member on the base, a second object supported by a second elastic member on the first object, a detection unit including a sensor having a first electrode provided on the first object and a second electrode provided on the second object, and a processor configured to obtain a distance between the first electrode and the second electrode using the sensor, a first driving unit configured to drive the first object, a first control unit configured to control the distance between the first electrode and the second electrode constant based on a detection result, wherein the second electrode and the processor are electrically connected to each other via the second elastic member. | 09-24-2015 |
20150369330 | VIBRATION CONTROL APPARATUS, LITHOGRAPHY APPARATUS, AND ARTICLE MANUFACTURING METHOD - A vibration control apparatus is provided that controls the vibration of a first object supported by a base, the apparatus comprising: a first control system including a first compensator for outputting a first operation signal representing an input to a first driving unit based on a first detection signal output by a first detector; a second control system including a second compensator for outputting a second operation signal representing an input to a second driving unit based on a second detection signal output by a second detector; and a third control system including a third compensator for outputting a third operation signal representing an input to the first driving unit based on a signal relating to the second control system so as to compensate the vibration of the base | 12-24-2015 |
Patent application number | Description | Published |
20090136736 | WATER-ABSORBING RESIN SUITABLE FOR ABSORBING VISCOUS LIQUIDS CONTAINING HIGH-MOLECULAR COMPOUND, AND ABSORBENT AND ABSORBENT ARTICLE EACH COMPRISING THE SAME - A water-absorbent resin is provided which is suitable for absorbing polymer-containing viscous liquids, wherein the specific surface area measured by the BET multipoint technique using krypton gas as the adsorption gas is no less than 0.05 m | 05-28-2009 |
20100273647 | WATER-ABSORBING RESIN SUITABLE FOR ABSORBING VISCOUS LIQUIDS CONTAINING HIGH-MOLECULAR COMPOUND, AND ABSORBENT AND ABSORBENT ARTICLE EACH COMPRISING THE SAME - A water-absorbent resin is provided which is suitable for absorbing polymer-containing viscous liquids, wherein the specific surface area measured by the BET multipoint technique using krypton gas as the adsorption gas is no less than 0.05 m | 10-28-2010 |
20110068300 | WATER-ABSORBING RESIN COMPOUND - The object of the present invention is to provide a water-absorbing resin compound, wherein the water-absorbing resin compound can retain antibacterial properties of an antibacterial metal to suppress the emission of unpleasant odors even when an organic material exists in a system in the case of using an eluting-type antibacterial agent. Thus, the present invention relates to a water-absorbing resin compound, which comprises a water-absorbing resin, an antibacterial agent having a porous material incorporating an antibacterial metal, and a metal chelating agent. Further, the present invention also relates to an absorbing material, which comprises a water-absorbing resin compound of the present invention, and a hydrophilic fiber as well as an absorbing product, which comprises a liquid-permeable sheet and a liquid-non-permeable sheet, and an absorbing material comprising a water-absorbing resin compound of the present invention, and a hydrophilic fiber between the liquid-permeable sheet and the liquid-non-permeable sheet. | 03-24-2011 |
20120070484 | WATER-ABSORBING RESIN COMPOSITION - A water-absorbent resin composition having an antimicrobial property, which suppresses the generation of dust of the antimicrobial agent. A water-absorbent resin composition comprising a water-absorbent resin and an antimicrobial agent comprising an inorganic compound carrying an antimicrobial metal, the water-absorbent resin composition being characterized in that the degree of generated dust of the water-absorbent resin composition is at most 100 CPM. The water-absorbent resin composition of the present invention can be suitably used as hygienic materials such as disposable diaper, sanitary napkin and incontinence pad; urine-absorbent materials for pets; materials for civil engineering and construction such as packing materials; drip absorbents; food freshness retaining materials such as cold-reserving agents; horticultural articles such as water-retaining materials for soils; and the like. | 03-22-2012 |
20120298913 | WATER-ABSORBENT RESIN PARTICLE, METHOD FOR PRODUCTION THEREOF, AND ABSORBENT MATERIAL USING THE SAME - A method for production of a water-absorbent resin particle which is excellent in a particle strength, and in which even after mechanical impact, a particle diameter retaining rate and a retaining rate of water absorption capacity under pressure are high, and an absorbent material using the same particle. The method includes the steps of polymerizing a water-soluble ethylenic unsaturated monomer using a water-soluble radical polymerization initiator, optionally in the presence of a crosslinking agent, to obtain a water-absorbent resin particle precursor, adding a post-crosslinking agent to crosslink a surface of the particle, adding an amorphous silica particle and adjusting the resulting particle to a moisture content of less than 10%, and subsequently adding moisture to adjust a final moisture content of the resulting particle to 10 to 20%. | 11-29-2012 |