CN-122001316-A - On-frame dispensing method for quartz vibrator inside ultra-small military surface mount crystal component

Abstract

The invention discloses a method for dispensing adhesive on an upper frame of a quartz vibrator in a subminiature military surface-mounted crystal component, which belongs to the technical field of crystal component manufacturing and comprises the steps of using conductive adhesive to respectively dispense two primer in two adhesive bonding pad areas on a base of the military surface-mounted crystal component; and dispensing surface glue at the junction of the mounting edge and the two base glue on the quartz vibrator, and then carrying out fan-shaped encapsulation on the mounting edge. The mounting and dispensing method disclosed by the invention can be suitable for the ultra-small military surface mount crystal elements with the packaging size specifications of SMD2520 and below, can solve and avoid the problems that the product after the sealing cover is short-circuited and the like easily caused after the internal bare quartz vibrator is dispensed, and can also ensure the high reliability of the military quartz crystal element under the complex application environments such as severe tolerance, thermal and mechanical conditions and the like.

Inventors

• WANG LI
• WANG WEIDAN
• ZHENG WENQIANG
• LI GUOQIANG
• NIU LEI
• GAO YUAN
• CUI WEI
• DUAN YOUFENG

Assignees

• 北京无线电计量测试研究所

Dates

Publication Date

20260508

Application Date

20251226

Claims (7)

1. 1. The on-frame adhesive dispensing method for the quartz vibrator in the ultra-small military surface mount crystal component is characterized by comprising the following steps of: s1, using conductive adhesive to respectively spot two primer in two spot-gluing welding disc areas on a base of a military surface-mounted crystal element; S2, taking one end of a short side of a plating electrode extension belt on the quartz vibrator as a mounting edge, respectively mounting two corners of the mounting edge on two base adhesives, and downwards extruding the adhesive of the base adhesives by the mounting edge; and S3, dispensing surface glue at the junction of the frame side and the two base glue on the quartz vibrator, and then carrying out fan-shaped encapsulation on the frame side.
2. 2. The method for dispensing adhesive onto a frame of a quartz vibrator for use in a subminiature military surface mount crystal component of claim 1, wherein the primer is hemispherical.
3. 3. The dispensing method for the upper frame of the quartz vibrator in the ultra-small military surface mount crystal component according to claim 2, wherein the dispensing position of the primer is close to the cavity wall of the short side of the base and is not in contact with the cavity wall.
4. 4. The dispensing method for mounting the quartz vibrator in the ultra-small military surface mount crystal component according to claim 3, wherein the primer is distributed on one side of the short side of the quartz vibrator, and the distance between the two primers is consistent with the width of the quartz vibrator.
5. 5. The dispensing method for the upper frame of the quartz vibrator in the ultra-small military surface mount crystal component according to claim 3, wherein the length of the junction between the edge of the frame side and the primer is 1/2-2/3 of the diameter of the primer.
6. 6. The method for dispensing on-frame quartz vibrators for use in subminiature military surface mount crystal components as set forth in claim 5, wherein the mounting positions of the quartz vibrators are bilaterally symmetrical.
7. 7. The dispensing method for the upper frame of the quartz vibrator in the ultra-small military surface mount crystal component according to claim 6, wherein the surface adhesive is lower than the upper edge of the base and is connected with the base adhesive into a whole.

Description

On-frame dispensing method for quartz vibrator inside ultra-small military surface mount crystal component Technical Field The invention belongs to the technical field of crystal component manufacturing, and particularly relates to an on-frame dispensing method for quartz vibrators inside a subminiature military surface-mounted crystal component. Background The quartz crystal component is a frequency standard and precise time-frequency component which is made of a quartz wafer with piezoelectric effect and an oscillating circuit, and has a series of outstanding characteristics of small volume, light weight, high integration degree and the like, and is widely applied to industries and fields of communication, medical treatment, aerospace, weaponry and the like in recent years as a main stream product of a military crystal oscillator. The small-sized surface-mounted crystal component products adopt integrated packaging structures due to the small-sized appearance requirement, an internal small-sized quartz resonator (bare quartz vibrator), an integrated circuit chip (oscillation chip) and the like are assembled in a ceramic base in a mixed and integrated manner, and the integrated small-sized SMD crystal oscillator is formed after packaging, so that the integrated and highly reliable design of the product is realized, and the structural schematic diagram of the product is shown in figure 1; The reliability weak link in the miniaturized surface-mounted crystal component is that the quartz vibrator and the base are assembled by using conductive adhesive for dispensing, and the dispensing method and the processing quality of the quartz vibrator for dispensing on the frame play a key role in the reliability of vibration resistance, shock resistance and the like of the quartz crystal component. Along with the reduction of the product size to SMD2520 and below packaging size specifications, the height space of the vibrator mounting in the inner cavity of the base is very narrow, and the height of the dispensing welding disc from the welding ring of the base is not more than 0.3mm, so that many civil products or imported products are usually mounted in a manner of holding the two sides of the base at the side of the base in view of the tiny mounting height, namely, dispensing positions are close to the long-side cavity wall of the base and distributed on two sides of the short side angle of the wafer, after dispensing the base in a full-height manner, the quartz vibrator is mounted on the base at the corner position of the short side and simultaneously presses the colloid downwards, so that the short side corner falls into the colloid and overflowed to carry out fan-shaped or half-moon-shaped encapsulation on the short side of the quartz vibrator, thereby forming left and right clamping on the cantilever-shaped quartz vibrator in the width direction (as shown in fig. 2). Although the mounting mode can avoid the problems of short circuit and the like of products after sealing covers after dispensing the surface adhesive, the clamping of the surface adhesive and the primer on the quartz vibrator is not favorable for the resistance to mechanical properties, the equivalent resistance, the quality factor Q and other properties of the products are adversely affected when the quantity of the primer is large, and the crystal components for the military weapon equipment system are matched, so that the crystal components have high reliability under the complex application environments of severe resistance, heat, mechanics and the like. Therefore, there is a need to design and develop a dispensing method for mounting a bare quartz vibrator inside a surface mount crystal element applicable to SMD2520 and below, which can avoid the problems of short circuit of the product after the sealing after dispensing the surface mount adhesive, and ensure high reliability of the military quartz crystal element under the complex application environments of severe tolerance, thermal and mechanical requirements. The foregoing is not necessarily a prior art, and falls within the technical scope of the inventors. Disclosure of Invention In order to solve the problems, the invention aims to provide an on-frame dispensing method for quartz vibrators inside subminiature military surface mount crystal components, which is applicable to subminiature military surface mount crystal components with SMD2520 and below package size specifications, can solve and avoid the problems that the inside bare quartz vibrators are easy to cause short circuit of products after sealing after dispensing, and the like, and can also ensure the high reliability of the performance of the military quartz crystal components under the complex application environments of severe tolerance, thermal, mechanical and the like. In order to achieve the above purpose, the invention provides a method for dispensing adhesive on a frame for quartz vibrators inside a microminiature milit