摘要:
A structure of the present invention has a printed circuit board having a land portion provided on a surface thereof on which a solder paste is printed in such a condition that, with respect to a lengthwise direction of a connecting terminal of an electronic component to be connected to the land portion, the solder paste projects outward from an edge of the land portion on the side of a front end of the connecting terminal and/or the solder paste is withdrawn toward inside the edge of the land portion on the side of a rear end of the connecting terminal. Solder projecting from the edge of the land portion on the side of the front end of the connecting terminal is used for forming a fillet by which the front end of the connecting terminal is surely covered. Also, as the solder paste is withdrawn from the edge of the land portion on the side of the rear end of the connecting terminal, any extra solder except for the solder indispensable for forming a soldered joint is not generated.
摘要:
A magnetic recording medium comprising: on a non-magnetic substrate, at least a soft magnetic undercoat film comprising a soft magnetic material; an orientation control film for controlling an orientation of a film directly above; a perpendicular magnetic film in which an axis of easy magnetization is oriented mainly perpendicularly with respect to the substrate; and a protection film, wherein the perpendicular magnetic film has a structure in which a large number of magnetic grains are separated by a grain boundary layer, and an average separating distance between the magnetic grains along a straight line which connects centers of gravity of mutually neighboring magnetic grains is 1 nm or greater.
摘要:
A magnetic recording medium comprising at least a soft magnetic layer, an orientation control film that controls the orientation of a film provided directly thereabove, an intermediate film, a perpendicular magnetic recording film of which the axis of easy magnetization is generally oriented perpendicular to a non-magnetic substrate, and a protective film, that are provided on said substrate, wherein the intermediate film has saturation magnetization Ms of at least 20 (emu/cc) and equal to or less than 200 (emu/cc), a method of manufacture thereof, and a magnetic read/write apparatus.
摘要:
An optical pickup device is equipped with a first light source that emits first light, a second light source that emits second light having a wavelength different from a wavelength of the first light, and a diffraction element that deflects the first light or the second light to match optical axes of the lights. The diffraction element is a step-like diffraction element in which one of an incident face and an emitting face thereof has a step-like grating face. A step difference of the step-like grating face is set to have a measurement that generates a phase difference of one wavelength of one of the first light and the second light, and the number of steps of the step-like grating face is set to maximize a (+) first order diffraction efficiency or a (−) first order diffraction efficiency for the other light.
摘要:
The present invention provides a worldwide compatible switching power supply unit of an RCC system in which by reducing the number of components or parts, reduction of cost can be realized and the mounting space can be reduced. In a high input voltage and in a light load, an inductance of a primary winding of a transistor is set high but in the range of not exceeding a rated value of a main switching element, and in a low input voltage and in a heavy load, an inductance of a primary auxiliary winding and values of a control resistor and a capacitor of the main switching element are set low but in the range of not deteriorating the starting characteristics of the main switching element.
摘要:
A PDC/PHS phone has both PDC communication function and PHS communication function. The PDC/PHS phone switches its communication mode from a PDC communication to a PHS communication which is less power consuming than the PDC communication, when its built-in battery runs down to a reference level in the course of communication with another phone. The PDC/PHS phone switches its communication mode back to the PDC communication again, when the battery is recharged enough.
摘要:
Improving layout characteristics of a detecting switch with respect to a control board to miniaturize an electric actuator. Switch-side connecting terminals are provided in a limit switch constituting a panel-position detecting mechanism, which is fixed to an outer face of a motor cover. Meanwhile, board-side connecting terminals having connecting portions to be terminal-connected to the switch-side connecting terminals are fixed to the control board, and the control board is disposed inside the motor cover and is fixed in a board case. By moving the limit switch toward the connecting portions, the switch-side connecting terminals and the connecting portions are connected, whereby the limit switch and the control board are connected.
摘要:
The surface shape measuring apparatus comprises a polar coordinate conversion portion for converting the orthogonal coordinate data representing the surface shape of a measurement object into the polar coordinate data, an approximate expression calculating portion for calculating an approximate expression on the basis of the polar coordinate data employing the Zernike's polynomial, an angle calculating portion for calculating angles representing the generating line and principal directions, a first approximate sectional shape calculating portion for calculating approximate sectional shapes in the generating line and principal line directions based on the calculated angles, a second approximate sectional shape calculating portion for calculating the center coordinates and the radiuses of curvature for the approximate sectional shapes, and a sectional shape data calculating portion for calculating the numerical data of approximate sectional shapes in the generating line and principal line directions on the basis of the center coordinates and the radiuses of curvature.
摘要:
In a ball grid array type semiconductor device including an interposer substrate having first and second surfaces, a semiconductor chip mounted on the first surface of the interposer substrate, and solder balls formed on the second surface of the interposer substrate, a plurality of through holes are formed within the interposer substrate, and each of the solder balls clogs one of the through holes of the interposer substrate.
摘要:
Disclosed is a magnetic recording medium having a laminate structure comprising at least a substrate, a Co alloy bias layer, a soft magnetic layer, and a magnetic recording layer. The direction of residual magnetization of the Co alloy bias layer faces one direction of its radial direction. Also, the perpendicular magnetic recording medium satisfies the relationship given below: Mssoft×(tsoft−40 nm)>Mssoft×40 nm+Msbias×tbias where, tbias denotes the thickness of the cobalt alloy bias layer, Msbias denotes the saturation magnetization of the cobalt alloy bias layer, tsoft denotes the thickness of the soft magnetic layer, which falls within a range of between 40 nm and 200 nm, and Mssoft denotes the saturation magnetization of the soft magnetic layer.