A compressor comprises a housing; a motor and a cylinder in the housing; a crankshaft for transmitting rotation force of the motor to pistons of the cylinder for compressing refrigerant; a compressing space formed by an upper cylinder cover, a lower cylinder and the cylinder and the upper cylinder cover and the lower cylinder cover are also used to prop up the crankshaft. The upper cylinder cover is disposed between the motor and the cylinder. The upper cylinder cover includes an through-hole for holding the crankshaft. The upper cylinder cover includes a first side facing the motor and a second side facing the cylinder. An inner wall of the casing is laser welded with an outer periphery of the first side and/or an outer periphery of the second side of the upper cylinder cover.

A vibration drive device that suppresses an increase in the number of component parts and can be easily downsized. Vibration is excited in a vibration element in pressure contact with a driven element to thereby rotationally move the driven element relative to the vibration element. A bearing rotatably supports the driven element. A first and a second bearing portions are joined to the driven element. The second and a third bearing portions are pressed against each other via rolling elements in a direction along the axis of the bearing. The rolling elements are brought into pressure contact with the first raceway surface of the first bearing portion, the second raceway surface of the second bearing portion, and the third raceway surface of the third bearing portion. One of the second and third bearing portions is integrally formed with the driven element from the same material.

A vibration drive device that suppresses an increase in the number of component parts and can be easily downsized. Vibration is excited in a vibration element in pressure contact with a driven element to thereby rotationally move the driven element relative to the vibration element. A bearing rotatably supports the driven element. A first and a second bearing portions are joined to the driven element. The second and a third bearing portions are pressed against each other via rolling elements in a direction along the axis of the bearing. The rolling elements are brought into pressure contact with the first raceway surface of the first bearing portion, the second raceway surface of the second bearing portion, and the third raceway surface of the third bearing portion. One of the second and third bearing portions is integrally formed with the driven element from the same material.

A first abutting surface, a first welding surface, a first facing surface are formed in a differential case. A second abutting surface, a second welding surface, and a second facing surface are formed in a differential ring gear. In an installing step, the first abutting surface and the second abutting surface are inserted, positions of the differential case and the differential ring gear are determined in an axial direction, a separation portion that spaces the first welding surface and the second welding surface away from each other and that has a non-linear portion is formed, and a void is formed between the first facing surface and the second facing surface. In a welding step, a laser is irradiated to the separation portion and the first welding surface and the second welding surface are welded.

Disclosed is a vacuum compartment structure for a cup lid and a manufacturing method thereof. The vacuum compartment structure for a cup lid includes a stainless steel cylinder body and a compartment upper cover. The compartment upper cover is covered on the cylinder body and has an inwardly recessed shape, and the compartment upper cover and the cylinder body are fixedly connected and sealed by laser welding. The compartment upper cover and the cylinder body form a vacuum chamber, which has a getter therein. The compartment upper cover is arranged with a plastic upper cover layer, an outer surface of the cylinder body is wrapped with a plastic lower cover layer, and the plastic upper cover layer is combined with the plastic lower cover layer to fasten and wrap the compartment upper cover and the cylinder body.

Disclosed is a vacuum compartment structure for a cup lid and a manufacturing method thereof. The vacuum compartment structure for a cup lid includes a stainless steel cylinder body and a compartment upper cover. The compartment upper cover is covered on the cylinder body and has an inwardly recessed shape, and the compartment upper cover and the cylinder body are fixedly connected and sealed by laser welding. The compartment upper cover and the cylinder body form a vacuum chamber, which has a getter therein. The compartment upper cover is arranged with a plastic upper cover layer, an outer surface of the cylinder body is wrapped with a plastic lower cover layer, and the plastic upper cover layer is combined with the plastic lower cover layer to fasten and wrap the compartment upper cover and the cylinder body.

An adjustment of the amount of energy in at least one specific applying unit is executed when energy is applied to a cylindrical member pair in which another cylindrical member is inserted inside a cylindrical member to melt and weld the cylindrical member pair in a circumferential direction. The adjustment is executed in association with a rotation angle to satisfy a relationship of Pd+Pw>, wherein Pd is an output decease rotation angle that decreases the energy amount from a steady energy amount HP applied from the specific applying unit in a welding end process, Pw is an overlap rotation angle at which the irradiation parts around the cylindrical member pair overlap with the steady energy amount HP, and is a separation angle between the specific applying unit and another applying unit adjacent to each other in a rotation direction around the axis.

An adjustment of the amount of energy in at least one specific applying unit is executed when energy is applied to a cylindrical member pair in which another cylindrical member is inserted inside a cylindrical member to melt and weld the cylindrical member pair in a circumferential direction. The adjustment is executed in association with a rotation angle to satisfy a relationship of Pd+Pw>, wherein Pd is an output decease rotation angle that decreases the energy amount from a steady energy amount HP applied from the specific applying unit in a welding end process, Pw is an overlap rotation angle at which the irradiation parts around the cylindrical member pair overlap with the steady energy amount HP, and is a separation angle between the specific applying unit and another applying unit adjacent to each other in a rotation direction around the axis.

A braze-free substrate heating device including a heater block body, a heater block lid, and a heating element. The heating element sits inside the heater block body. The heater block lid is on the heating element, such that the heating element is sandwiched between the heater block lid and the floor of the heater block body. The heating element is held in place by compressing the heater block lid into the heater block body and attaching the heater block lid to the top of the heater block body so that the heating element is fully supported over its surface area, and can maintain uniform thermal contact with the heater block lid and heater block body over its entire surface area.

Device and method for laser welding around a circumference of a workpiece. A fixed, non-movable unitary optical reflector is provided, which has a pair of optical reflecting surface portions on a first side surface and a second side surface, respectively, arranged at an obtuse angle relative to each other. A workpiece is positioned and fixed in an assembly that includes the unitary optical reflector. During setup, the vertical distance is adjusted between the unitary optical reflector and the workpiece along an axis that is transverse to a longitudinal axis of the workpiece without any adjustment of the reflecting surfaces, which remain fixed during setup. The first and second side surfaces define a curve that is transverse to the longitudinal axis. Once setup has been completed, a laser beam is directed so that it moves along the optical reflector to thereby produce a 360 degree circumferential weld around the workpiece.