LED SMD lamp is made of FPC circuit board, LED lamp and high-quality silicone sleeve. Good waterproof performance, safe and convenient use of low-voltage DC power supply, diverse and bright colors; Outdoor use can resist ultraviolet aging, yellowing and high temperature. This product is widely used in building outline lights, quasi-decorative lighting in entertainment places, advertising decorative lighting and other fields. Application places: jewelry display cabinet lighting, display cabinet lighting, cabinet lighting, wardrobe lighting, storefront decoration lighting, lighting art lighting, advertising light box lighting and hotel, guesthouse, home villa decoration lighting, etc. X-Y positioning system is the main index to evaluate the accuracy of mounter, which includes transmission mechanism and servo system. The increase of die attach speed means that the X-Y transmission mechanism generates heat due to the increase of its running speed, and the ball screw is the main heat source, and its heat change will affect the mounting accuracy. The newly developed X-Y transmission system has a cooling system in the guide rail. The high-speed mounter adopts frictionless linear motor and air bearing guide rail, which runs faster. Driven by AC servo motor, under the command of sensor and control system, accurate positioning is realized, so the accuracy of sensor plays a key role. The displacement sensor includes a circular grating encoder, a magnetic grating ruler and a grating ruler. The rotary part of the circular grating encoder is equipped with two circular gratings, which are made of glass or transparent plastic and plated with bright and dark radial chromium wires. The distance between light and shade is called a grating node, and the total number of grating nodes in a whole circle is the number of linear pulses of the encoder. The number of chromium lines also shows the accuracy. One grating is fixed on the rotating part as an indexing grating, and the other grating moves with the rotating shaft and is used for counting, so that the indexing grating and the rotating grating form a pair of scanning systems, which is equivalent to a counting sensor.