Abstract: A gastrointestinal tract diagnosis device, comprising: an endoscope having a substrate and a control unit and a recognition marker therein; an image capturing module including a first lens and an image sensor that are disposed on the substrate; an illuminating module including a first light source disposed on the substrate; an enclosure body assembled to a connection device to waterproofingly enclose the image capturing module and the illuminating module; and a work station connecting to the endoscope to access the recognition marker to add a machine identity into the recognition marker to match with the endoscope, wherein the work station determines if a usage state of the endoscope is overdue; the work station determines if the endoscope has connected to an another work station different from the work station by the recognition marker and the machine identity. A control method based on the above device is also provided.

Abstract: An LED chip package having a topographical glass coating on top surface for enhancing heat dissipation is disclosed. A circular wall is optionally built to surround the LED chip for reflecting light beams from the LED chips; the glass coating further extends to cove the inner wall surface of the circular wall. The larger area the glass coating covers, the more heat the package dissipates in a time unit. The LED chip package according to the present invention exhibits higher thermal dissipation and helps to last longer the life of the LED chip package than a traditional one.

Abstract: A method of detecting a preload of a ball screw is to acquire an operational signal of the ball screw, to process the operational signal via a theoretical ball pass order and an order tracking analysis procedure to acquire an actual ball pass order, to compare and judge the relationship between the actual ball pass order and the theoretical ball pass order via a preload judgment procedure, and finally to observe the proportion of occurrence of side band of the actual ball pass order to determine the preload status of the ball screw.