Preparation method of quasi-SMD (Surface Mount Device) crystal oscillator

Abstract

The invention discloses a preparation method of a quasi-SMD (Surface Mount Device) crystal oscillator, which is characterized in that the preparation method comprises the following steps: coarsely grinding piezoelectric crystals by a grinding machine, and extracting a crystal bar; cutting the crystal bar into a rectangular crystal piece by a multitool machine; finely grinding the rectangular piece for four times by a lapping machine, and using a frequency division machine for frequency division so as to obtain a crystal frequency piece; cleaning the crystal frequency piece by a cleaning agent and ionized water, then using a drying machine to dewater the crystal frequency piece; storing the crystal frequency piece in a nitrogen box; and spraying a sliver layer on the crystal frequency piece by using a molecular pump vacuum coating machine, dispensing conducting resin on the crystal frequency piece with a silver layer by an automatic dispensing machine, fixing the dispensed crystal frequency piece on a base, compensating the frequency by a fine tuning machine and adding the silver layer, then sealing and soldering the crystal frequency piece on the base by a shell, instantly charging nitrogen when the sealing and soldering operation is conducted, and obtaining a finished product when the leakage check is qualified. The preparation method provided by the invention is reasonable, the cost is low, the operability is strong, the product quality can be improved effectively, and the produced product has a small size and is strong in stability.

Description

technical field [0001] The invention relates to a method for preparing a crystal element, in particular to a method for preparing a quasi-SMD crystal oscillator. Background technique [0002] Quartz crystal components are widely used in electronic machines, from ordinary children's toys, electronic clocks and watches to color TVs, audio, VCD, microprocessors, wireless communications, TV signal broadcasting, etc. are inseparable from it. With the rapid development of the electronic information industry, especially the wide application of digital circuits, the market demand for quartz crystal components is growing rapidly. Chipping, miniaturization, high frequency stability and some special requirements for crystal components are also getting higher and higher. In recent years, the technical level of production, technology and product quality of quartz crystal components at home and abroad has developed by leaps and bounds. [0003] In recent years, my country's quartz crys...

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Problems solved by technology

[0004] At present, there are more than 600 manufacturers of quartz crystal components in China, but most of them produce raw chips and process low-end products. At present, the main varieties are 49U and UM series, and 49S and SMD series are high-end products. Only a few manufacturers research and develop. Moreover, it cannot meet the needs of the product in terms of product accuracy and stability.