Abstract: In a semiconductor device, a semiconductor module is pressed against a cooler by a spring member. The spring member is compressed by a beam member that is connected with a strut fixed to the cooler. The cooler has a pressed part in which the semiconductor module is pressed, and a strut fixing part to which the strut is fixed. The strut fixing part has higher rigidity than the pressed part.

Abstract: There is provided a vertical lathe which, when machining gradually varying lens grooves in a mold for molding of a Fresnel lens, can change the angle of a cutting tool without positional displacement of the cutting tip, enabling high accuracy machining of the gradually varying lens grooves. The vertical lathe includes: a column; a rotary table for rotating a workpiece; a cantilevered cross rail supported by the column; a saddle movable in a horizontal direction along a guideway of the cross rail; a ram suspended from the saddle and movable vertically along a guideway of the saddle; and an inclined head mounted to the lower end of the ram and having an inclined swivel shaft for holding a cutting tool, wherein said swivel shaft is configured to swivel the cutting tool around a nose of the cutting tool as the center of swiveling.

Abstract: In a vertical lathe of an open side column type, a pair of linear guides (65,66) arranged in parallel in a cross rail (62), and a space portion (67) is formed between them (65,66). A saddle (90) is supported by the linear guides (65, 66) above the space portion (67) and moved in an axis direction (X axis). A ram (120) is suspended through the space portion (67) and moved in a vertical direction (X axis). A rotary driving disc (34) fixed on the table rotation driving shalt (33) is connected to a rotary table (30) by plural torque transmission pins (37) in torque transmission relationship. Thereby, the rotary table (30) rotates in carrier method. A tool holder (151) is rotatably driven at an optional angle position (B axis position) by a B axis servomotor (163) about a horizontal axis. The tool holder (151) is clamped at an optional rotation angle position by a thrust static pressure bearing under oil-pressure supply to one of thrust static pressure portions.

Abstract: There is provided a vertical lathe which, when machining gradually varying lens grooves in a mold for molding of a Fresnel lens, can change the angle of a cutting tool without positional displacement of the cutting tip, enabling high accuracy machining of the gradually varying lens grooves. The vertical lathe includes: a column; a rotary table for rotating a workpiece; a cantilevered cross rail supported by the column; a saddle movable in a horizontal direction along a guideway of the cross rail; a ram suspended from the saddle and movable vertically along a guideway of the saddle; and an inclined head mounted to the lower end of the ram and having an inclined swivel shaft for holding a cutting tool, wherein said swivel shaft is configured to swivel the cutting tool around a nose of the cutting tool as the center of swiveling.

Abstract: There is provided a vacuum chuck apparatus which eliminates the need to stop machining of a workpiece for cleaning of a filter of the vacuum chuck apparatus and thus enables a long-term continuous operation of a machine tool.

Abstract: In a vertical lathe of an open side column type, a pair of linear guides (65,66) arranged in parallel in a cross rail (62), and a space portion (67) is formed between them (65,66). A saddle (90) is supported by the linear guides (65, 66) above the space portion (67) and moved in an axis direction (X axis). A ram (120) is suspended through the space portion (67) and moved in a vertical direction (X axis). A rotary driving disc (34) fixed on the table rotation driving shalt (33) is connected to a rotary table (30) by plural torque transmission pins (37) in torque transmission relationship. Thereby, the rotary table (30) rotates in carrier method. A tool holder (151) is rotatably driven at an optional angle position (B axis position) by a B axis servomotor (163) about a horizontal axis. The tool holder (151) is clamped at an optional rotation angle position by a thrust static pressure bearing under oil-pressure supply to one of thrust static pressure portions.