Abstract: A light receiving element includes a substrate having a first main surface, and includes a light receiving layer provided on the first main surface. The light receiving layer includes a first semiconductor layer and a second semiconductor layer provided on the first semiconductor layer. The light receiving element includes a contact layer provided on the light receiving layer, and includes a groove that separates the contact layer for each pixel. The first semiconductor layer includes a type-II quantum-well layer including an InGaAs layer and a GaAsSb layer. The second semiconductor layer includes a AlxGayIn1-x-yAs layer, where 0?x<1, 0?y<1, and 0<x+y<1. The bottom surface of the groove is situated between a top surface and a bottom surface of the second semiconductor layer, and the light receiving layer includes an n-type region below an exposed portion of a bottom surface of the groove.

Abstract: A thermal transfer printer includes: an ink ribbon conveyor unit that conveys an ink ribbon; a sheet conveyor unit that conveys a sheet; a dummy pattern generation unit that generates a dummy pattern; an image data generation unit that generates print image data joining n screens together, the print image data including the dummy pattern inserted between two adjacent screens among the n screens; a thermal head that transfers a dye coated on the ink ribbon in accordance with the print image data; and a peeler unit that peels the ink ribbon from the sheet. An average density of the dummy pattern is equal to an average density of the image over an area equivalent to a distance between a tail end portion of the thermal head and the peeler unit, on one screen that follows the dummy pattern.

Abstract: A thermal transfer printer includes: an ink ribbon conveyor unit that conveys an ink ribbon; a sheet conveyor unit that conveys a sheet; a dummy pattern generation unit that generates a dummy pattern; an image data generation unit that generates print image data joining n screens together, the print image data including the dummy pattern inserted between two adjacent screens among the n screens; a thermal head that transfers a dye coated on the ink ribbon in accordance with the print image data; and a peeler unit that peels the ink ribbon from the sheet. An average density of the dummy pattern is equal to an average density of the image over an area equivalent to a distance between a tail end portion of the thermal head and the peeler unit, on one screen that follows the dummy pattern.

Abstract: A machine tool is provided in which a movable member can be moved in an optimum state according to an axial traverse mode. A vertical machining center as the machine tool includes a column provided upright on a bed, a spindle head supported on a front face of the column, a saddle provided in front of the column on the bed, and a table provided on the saddle. The saddle and the table are respectively guided in their movement directions by hydrostatic slideways. When the saddle and the table are moved in a so-called cutting feed mode, pressurized oil is automatically supplied to the respective hydrostatic slideways at a lower pressure. When the saddle and the table are moved in a so-called rapid traverse mode, the pressurized oil is automatically supplied to the respective hydrostatic slideways at a higher pressure.

Abstract: A machine tool is provided in which a movable member guided by a hydrostatic slideway is held in a predetermined attitude. A vertical machining center as the machine tool includes a spindle head supported on a front face of a column in a vertically movable manner. A hydrostatic slideway for guiding the spindle head includes a slide rail provided on the spindle head and a slide guide provided on the front face of the column. A pocket is provided in a lower end portion of a slideway of the slide guide on the side of the column. Pressurized oil is supplied into the pocket at a pressure which is gradually increased according to a downward movement distance of the spindle head from the uppermost position.

Abstract: In the present invention, the recording paper is conveyed by a feed roller to plural recording portions sequentially, and each recording portion successively prints each specific color on the recording paper while applying tension to the paper. The tension applied to the recording paper is switched to a predetermined value each time the recording paper is conveyed to each recording, portion when starting to print.

Abstract: In a thermal-transfer-type color printer, an ink ribbon and a paper are sandwiched between a thermal head and a platen roller so that a specific image is transferred onto the paper in a specific color. The platen roller is made by a rubber material which has a certain degree of hardness. On the surface of the ink ribbon, plural colors of ink are sequentially and repeatedly painted. Hence, after transferring an image onto the paper in one color, the paper is moved backward; and then, another image is transferred onto the paper in another color. Thus, a multi-color printing is performed. In order to avoid a color shade or an printing error, in which a printing position of one-color image does not accurately match with a printing position of another-color image, the paper should be accurately moved forward and backward. In order to do so, the thermal-transfer-type color printer provides a precise paper-feed mechanism which comprises a pinch roller and a paper-feed roller.

Abstract: A heat-sensitive recording material characterized in that a heat-sensitive color-developing layer containing a compound represented by the formula (I), ##STR1## wherein R represents a hydrogen atom or a methyl group, a leuco dye and an acidic substance is formed on a support.