Abstract: A memory system having a main memory which is coupled to a plurality of parallel virtual access channels. Each of the virtual access channels provides a set of memory access resources for controlling the main memory. These memory access resources include, interfaces, cache resources (including cache chaining), burst mode operation control and precharge operation control. A plurality of the virtual access channels are cacheable virtual access channels, each of which includes a channel row cache memory for storing one or more cache entries and a channel row address register for storing corresponding cache address entries. One or more non-cacheable virtual access channels are provided by a bus bypass circuit. Each virtual access channel is independently addressable, such that particular memory masters can be assigned to access particular virtual access channels.

Abstract: A memory system having a main memory which is coupled to a plurality of parallel virtual access channels. Each of the virtual access channels provides a set of memory access resources for controlling the main memory. These memory access resources include cache resources (including cache chaining), burst mode operation control and precharge operation control. A plurality of the virtual access channels are cacheable virtual access channels, each of which includes a channel row cache memory for storing one or more cache entries and a channel row address register for storing corresponding cache address entries. One or more non-cacheable virtual access channels are provided by a bus bypass circuit. Each virtual access channel is addressable, such that particular memory masters can be assigned to access particular virtual access channels.

Abstract: The present invention provides a reflow apparatus and method effective to make constant the internal gas flow direction in a heating section within a reflow furnace. A circulating gas path is formed in a heating unit which collects and causes the gas to flow from a sirocco fan, up the rear side of the heating unit and then down towards a circuit board moving along a transfer path at the front side of the heating unit. Moreover, a plurality of straightening plates are arranged above the transfer path of the heating unit so as to guide the hot gas, which is flowing forwardly downwardly toward the circuit board moving along the transfer path. A blow-down nozzle is provided and includes a plurality of plates aligned in rows in the transferring direction of the circuit boards. The plates have an inverse U-shaped cross section. The blow-down nozzle is arranged below the straightening plates to cause the vertical hot gas flows to flow uniformly over the whole surface of the circuit board.

Abstract: A confocal optical apparatus comprising a light source, a first aperture portion for passing light emitted from the light source and obtaining a point source, an objective lens for causing the light that has passed through the first aperture portion to converge on a measurement object, a second aperture portion located on a plane conjugate with the convergence surface on the measurement object, and light detectors for detecting light that has passed through the second aperture portion, wherein placing the first and second aperture portions in the same position and using them as the same aperture portion, as well as positioning the detection surfaces of the light detectors substantially on the same surfaces as the conjointly used identical aperture portions make it possible to reduce the size and weight of the apparatus, to perform three-dimensional shape measurements rapidly and accurately, and to facilitate the alignment of each portion.

Abstract: A three-dimensional image measuring device which comprises a light source; a plane image forming unit for forming a plane image in a space in its depth direction on the basis of light emitted from the light source; a scanning unit for moving and scanning the plane image formed by the plane image forming unit in its depth direction; an object to be measured disposed in the space where the plane image is formed; a light receiving unit for measuring the strength of light scattered on a surface of the object as the plane image is moved and scanned and; a distance measuring unit for measuring the distance to the object on the basis of the output of the light receiving unit, whereby a three-dimensional image with least reduced invisible area is easily and accurately measured in a short time without using the principle of triangulation.

Abstract: A three-dimensional image measuring device which comprises a light source; a plane image forming unit for forming a plane image in a space in its depth direction on the basis of light emitted from the light source; a scanning unit for moving and scanning the plane image formed by the plane image forming unit in its depth direction; an object to be measured disposed in the space,where the plane image is formed; a light receiving unit for measuring strength of light scattered on a surface of the object as the plane image is moved and scanned and; a distance measuring unit for measuring the distance to the Object on the basis of the output of the light receiving unit, whereby a three-dimensional image with least reduced invisible area is easily and accurately measured in a short time without using the principle of triangulation.

Abstract: A three-dimensional image measuring device which comprises a light source; a plane image forming unit for forming a plane image in a space in its depth direction on the basis of light emitted from the light source; a scanning unit for moving and scanning the plane image formed by the plane image forming unit in its depth direction; an object to be measured disposed in the space where the plane image is formed; a light receiving unit for measuring the strength of light scattered on a surface of the object as the plane image is moved and scanned and; a distance measuring unit for measuring the distance to the object on the basis of the output of the light receiving unit, whereby a three-dimensional image with least reduced invisible area is easily and accurately measured in a short time without using the principle of triangulation.

Abstract: A semiconductor memory device has a built-in error correction system for correcting undesirably inverted data bits, and the built-in error correction system starts a parity bit generating sequence and an error correcting sequence only when increase of error rate is forecasted, thereby increasing the access speed without sacrifice of the reliability.

Abstract: The present invention provides a reflow apparatus and method effective to make constant the internal gas flow direction in a heating section within a reflow furnace. A circulating gas path is formed in a heating unit which collects and causes the gas to flow from a sirocco fan, up the rear side of the heating unit and then down towards a circuit board moving along a transfer path at the front side of the heating unit. Moreover, a plurality of straightening plates are arranged above the transfer path of the heating unit so as to guide the hot gas, which is flowing forwardly downwardly toward the circuit board moving along the transfer path. A blow-down nozzle is provided and includes a plurality of plates aligned in rows in the transferring direction of the circuit boards. The plates have an inverse U-shaped cross section. The blow-down nozzle is arranged below the straightening plates to cause the vertical hot gas flows to flow uniformly over the whole surface of the circuit board.

Abstract: A three-dimensional image display device which comprises a holographic plate having a plurality of holograms divided in correspondence with rotational angles, the holographic plate being exposed so that when light is irradiated, each of the holograms forms a point image at a different position in a depth direction of the holographic plate; a drive unit for rotating the holographic plate; a light irradiating unit including a plurality of light sources arranged substantially in a straight line so that the light sources are kept at substantially equal distances from the holographic plate, for irradiating the holographic plate with light from the light sources; and a controller for controlling the drive unit and lighting operations of the plurality of light sources of the light irradiating unit in accordance with a signal indicative of a three-dimensional image to be displayed so as to control lighting of a plurality of point images formed in a three-dimensional space, whereby a three-dimensional image can be obt

Abstract: The present invention provides a reflow apparatus and method effective to make constant the internal gas flow direction in a heating section within a reflow furnace. A circulating gas path is formed in a heating unit which collects and causes the gas to flow from a sirocco fan, up the rear side of the heating unit and then down towards a circuit board moving along a transfer path at the front side of the heating unit. Moreover, a plurality of straightening plates are arranged above the transfer path of the heating unit so as to guide the hot gas, which is flowing forwardly downwardly toward the circuit board moving along the transfer path. A blow-down nozzle is provided and includes a plurality of plates aligned in rows in the transferring direction of the circuit boards. The plates have an inverse U-shaped cross section. The blow-down nozzle is arranged below the straightening plates to cause the vertical hot gas flows to flow uniformly over the whole surface of the circuit board.

Abstract: A three-dimensional image measuring device which comprises a light source; a plane image forming unit for forming a plane image in a space in its depth direction .on the basis of light emitted from the light source; a scanning unit for moving and scanning the plane image formed by the plane image forming means in its depth direction; an object to be measured disposed in the space where the plane image is formed; a light receiving unit for measuring a strength of light scattered on a surface of the object as the plane image is moved and scanned and; a distance measuring unit for measuring the distance to the object on the basis of the output of the light receiving unit, whereby a three-dimensional image with least reduced invisible area is easily and accurately measured in a short time without using the principle of triangulation.

Abstract: A three-dimensional image display device which comprises a light source; a hologram divided into a plurality of divided areas and exposed so that point images are formed at different positions in a three-dimensional space in the respective divided areas when the light from the light source is irradiated; a hologram driver unit for driving the hologram such that light from the light source is selectively entered into one of the plurality of divided areas and; a control unit for controlling the lighting up of the point images formed in the three-dimensional space in correspondence to a three-dimensional image signal by controlling the hologram and the light source in accordance with the three-dimensional image signal to be displayed, whereby a three-dimensional image is obtained by the hologram with the simple-configured device.

Abstract: A flip-flop is composed of inverters including first and second MISFETs each comprising a TFT or an SOI transistor. A third MISFET, which comprises a TFT or an SOI transistor, has a gate connected to a write selecting signal line, and is connected between the output terminal of one of the inverters and a write/read signal line. A fourth MISFET has a gate connected to the gate of the other inverter. A fifth MISFET has a drain and a source connected to the write/read signal line and the drain of the fourth MISFET, and a gate connected to a read selecting signal line.

Abstract: There is disclosed a polishing apparatus utilizing a gel material as the polishing tool, in which the gel material is rotated in the vicinity of a surface to be polished, or is given rotating and rocking motions in direct contact with the surface to be polished.

Abstract: A static memory device has memory cells each having a pair of driver MOSFETs, two load resistors each connected between a power source and a drain of each of the driver MOSFETs, two access MOSFETs each of which is connected between the drain of each of the driver MOSFETs and each of bit lines and gates of which are connected to a word line. In the memory cell, the thickness of a gate oxide film of the access MOSFET is made thicker than that of the gate oxide film of the driver MOSFET. The operation stability of the memory cell is enhanced, without the need of increasing a chip size, by increasing a ratio between the driver MOSFETs and the access MOSFETs of the memory cell (the ratio of current supplying capabilities of the two transistors) without making a gate size large or without making it so small as to cause process variations.

Abstract: An asynchronous type static memory device in which a plurality of pairs of bit lines are equalized upon change of address signals at a high speed is disclosed.

Abstract: A difference amplifier circuit comprises two series combinations coupled in parallel between a first source of voltage and a common node, an activation transistor responsive to a control signal for propagating a second voltage level to the common node and a channel conductance regulating circuit responsive to the control signal and operative to regulate channel conductances of the respective series combinations, so that the channel conductances are easily fallen within a target range through the function of the regulating circuit even if the process conditions are fluctuated.

Abstract: There is disclosed a polishing apparatus utilizing a gel material as the polishing tool, in which the gel material is rotated in the vicinity of a surface to be polished, or is given rotating and rocking motions in direct contact with the surface to be polished.

Abstract: There is disclosed a polishing apparatus utilizing a gel material as the polishing tool, in which the gel material is rotated in the vicinity of a surface to be polished, or is given rotating and rocking motions in direct contact with the surface to be polished.