Abstract: A semiconductor device includes a source/drain feature over a semiconductor substrate, channel layers over the semiconductor substrate and connected to the source/drain feature, a gate portion between vertically adjacent channel layers, and an inner spacer between the source/drain feature and the gate portion and between adjacent channel layers. The semiconductor device further includes an air gap between the inner spacer and the source/drain feature.

Abstract: A system chip, and a built-in self-test circuit and a self-test method thereof are provided. The system chip includes an analog front end circuit, a digital physical layer circuit and a built-in self-test circuit. The digital physical layer circuit is coupled to the analog front end circuit, and the built-in self-test circuit is coupled to the digital physical layer circuit and is arranged to test the analog front end circuit with aid of the digital physical layer circuit.

Abstract: A system chip, and a built-in self-test circuit and a self-test method thereof are provided. The system chip includes an analog front end circuit, a digital physical layer circuit and a built-in self-test circuit. The digital physical layer circuit is coupled to the analog front end circuit, and the built-in self-test circuit is coupled to the digital physical layer circuit and is arranged to test the analog front end circuit with aid of the digital physical layer circuit.

Abstract: A motion guide device includes an elongated shaft having a groove formed on an outer peripheral surface, a movable member attached onto the shaft and having a bore for receiving the shaft, a housing attached to the movable member and having a space for receiving a lubricating oil, the housing includes a passage communicative with the bore and the space of the housing for allowing the lubricating oil to flow from the space into the groove of the shaft, and an oil applying member is rotatably engaged in the passage of the housing to carry and to apply or distribute the lubricating oil through the passage of the housing and then into the groove of the elongated shaft.

Abstract: A transmission system with a lubrication device is disclosed. The lubrication device is defined with an accommodation trough and an oil hole. In the accommodation trough is disposed a guiding assembly. The guiding assembly cooperates with the accommodation trough to define an oil storage space for accommodation of lubricating grease. The oil storage space is in communication with the oil hole. A power module is connected to the guiding assembly to drive the guiding assembly at regular intervals to make the lubricating grease overflow to the linear transmission system through the oil hole to perform the lubrication.

Abstract: A chips dischargeable wiper is disposed at the end of a nut, the wiper is defined with a flange, a plurality of ribs integrally formed with the flange, and a plurality of through holes located beside the flange. The flange is used to mate with the helical groove of the ball screw in such a manner that a rib is formed on the flange, which not only can reduce the resistance of the wiper, but also can effectively prevent intrusion of foreign objects into the screw shaft and can prevent leakage of lubricating agent. Furthermore, the rib can collect dusts and the foreign objects and discharge them out of the through holes. Therefore, the structure of wiper is simplified and can be used for a long time without maintenance.

Abstract: A transmission system with a lubrication device is disclosed. The lubrication device is defined with an accommodation trough and an oil hole. In the accommodation trough is disposed a guiding assembly. The guiding assembly cooperates with the accommodation trough to define an oil storage space for accommodation of lubricating grease. The oil storage space is in communication with the oil hole. A power module is connected to the guiding assembly to drive the guiding assembly at regular intervals to make the lubricating grease overflow to the linear transmission system through the oil hole to perform the lubrication.

Abstract: A motion guide device includes an elongated shaft having a groove formed on an outer peripheral surface, a movable member attached onto the shaft and having a bore for receiving the shaft, a housing attached to the movable member and having a space for receiving a lubricating oil, the housing includes a passage communicative with the bore and the space of the housing for allowing the lubricating oil to flow from the space into the groove of the shaft, and an oil applying member is rotatably engaged in the passage of the housing to carry and to apply or distribute the lubricating oil through the passage of the housing and then into the groove of the elongated shaft.

Abstract: A chips dischargeable wiper is disposed at the end of a nut, the wiper is defined with a flange, a plurality of ribs integrally formed with the flange, and a plurality of through holes located beside the flange. The flange is used to mate with the helical groove of the ball screw in such a manner at least a rib tapered from outside in is disposed between the flange and the screw shaft, which not only can reduce the resistance of the wiper, but also can effectively prevent intrusion of foreign objects into the screw shaft and can prevent leakage of lubricating agent. Furthermore, the rib can collect dusts and the foreign objects and discharge them out of the through holes. Therefore, the structure of wiper is simplified and can be used for a long time without maintenance.

Abstract: A ball screw device includes a ball nut having an inner thread formed by a number of helical groove portions for forming an endless ball rolling passage in the ball nut and for receiving a number of bearing members, and an endless spacer moving passage formed in the ball nut and communicating with the endless ball rolling passage of the ball nut for receiving a number of bearing spacers which are engaged between the bearing members for spacing the bearing members away from each other and for preventing the bearing members from striking onto each other. The bearing spacers may be spherical bearing spacers, and made of synthetic materials.

Abstract: A dustproof device for a ball screw disposed on an end surface of a nut comprises: an absorber, an oil scraping piece and a wiping member. The absorber is made of liquid-absorbing material. The oil scraping piece has an oil scraping portion contacting the surface of the screw. The wiping member is formed with a threaded portion for meshing with the surface of the screw. And a plurality of protrusions is formed between the wiping member and the oil scraping piece for defining at least one radial through hole between the wiping member and the oil scraping piece. Therefore, the dustproof device can block and remove powder and liquid, and prevent lubricant leakage out of the nut and can absorb a tiny amount of cutting fluid passing through the oil scraping piece.

Abstract: A dust-proof structure for a ball screw comprises: a wiper, a wiping piece and a fastening device. The wiper is a C-shaped structure defined with a gap for accommodation of a wiping piece and is annually mounted on a surface of a screw shaft. The wiper is formed at either side of the gap with a bevel surface, and the wiping piece is also formed at both sides thereof with a bevel surface for mating with the bevel surface of the gap, so that the wiper and the wiping piece are maintained into contact via the bevel surfaces. The fastening device enables the C-shaped wiper to be deformed in radial direction, making the wiping piece abut against the surface of the screw shaft. By such arrangements, an interacting force between the bevel surfaces of the wiping piece and the wiper pushes the wiping piece toward the surface of the screw shaft, thus effectively preventing dust.

Abstract: A chips dischargeable wiper is disposed at the end of a nut, the wiper is defined with a flange, a plurality of ribs integrally formed with the flange, and a plurality of through holes located beside the flange. The flange is used to mate with the helical groove of the ball screw in such a manner at least a rib tapered from outside in is disposed between the flange and the screw shaft, which not only can reduce the resistance of the wiper, but also can effectively prevent intrusion of foreign objects into the screw shaft and can prevent leakage of lubricating agent. Furthermore, the rib can collect dusts and the foreign objects and discharge them out of the through holes. Therefore, the structure of wiper is simplified and can be used for a long time without maintenance.

Abstract: The recirculating element having a turning track corresponding to helical track of a ball screw and corresponding to returning hole of nut. And the turning track comprises a tangential direction changing position and a screw thread departing position being adjacent to an entrance of the turning track. And the entrance of the turning track has an upper wall surface and a lower wall face, which form a first inclined angle and a second inclined angle with the horizontal direction respectively. The first angle of the upper wall surface is smaller or equal to a minimum lead angle of the ball screw and the second inclined angle of the lower wall surface is smaller or equal to a maximum lead angle of the ball screw. So it is suitable for ball screws with different leads.

Abstract: A preload adjusting device for a ball screw is disposed between screw nuts of a ball screw and comprises: two preload pieces each formed at a side thereof with a slant surface. The two preload pieces are mounted between the screw nuts in such a manner that the slant surfaces of the two preload pieces abut against each other, by such arrangements, a combined thickness of the two preload pieces will be changed by a relative displacement between the preload pieces, and in this way, a preload between the screw nuts is adjusted.