Title:
CARRIER BOARD DESIGN AND PACKAGING METHOD CAPABLE OF SOLVING TOMBSTONING OF SMALL-SIZED RESISTOR-CAPACITOR UNIT, AND CARRIER BOARD
Document Type and Number:
WIPO Patent Application WO/2019/179061
Kind Code:
A1
Abstract:
Provided are a carrier board design and packaging method capable of solving tombstoning of a small-sized resistor-capacitor unit, and a carrier board. The method comprises the following steps of: measuring the length, width and height of a small-sized resistor-capacitor unit (S1); setting the dimensions of a newly formed window of a carrier board bonding pad (S2); forming the carrier board according to the window structure of the bonding pad (S3); forming a tin paste printing stencil according to the bonding pad window, wherein the window dimensions of the stencil are consistent with the window dimensions of the bonding pad of the carrier board (S4); performing tin paste printing, in which the printing stencil is aligned with the carrier board window position and tin paste printing is performed (S5); mounting the resistor-capacitor unit, combining the carrier board and the stencil and performing tin paste printing and forming, and mounting the small-sized resistor-capacitor unit on the bonding pad window surface of the carrier board (S6); and performing reflow soldering and resolidifying in a reflow soldering oven, heating in a heating region and a thermal insulation region to enable the tin paste to be liquidized and to reflow, and resolidifying and shaping in a cooling region, wherein metal of the terminal and the carrier board bonding pad of the resistor-capacitor unit are connected in the reflow soldering process such that they are mutually electrically conductive, thereby mounting the resistor-capacitor unit (S7); and completing subsequent procedures after packaging (S8). The invention more directly and effectively resolves the problem of tombstoning in a small-sized resistor-capacitor unit and improves carrier board product yield and life cycle reliability.
Inventors:
WU XIANWEI (CN)
LONG HUA (CN)
GUO JIASHUAI (CN)
ZHENG RUI (CN)
LONG HUA (CN)
GUO JIASHUAI (CN)
ZHENG RUI (CN)
Application Number:
PCT/CN2018/104479
Publication Date:
September 26, 2019
Filing Date:
September 07, 2018
Export Citation:
Assignee:
LANSUS TECH INC (CN)
International Classes:
H05K3/34; H05K13/04
Foreign References:
| CN200947702Y | 2007-09-12 | |||
| CN200947702Y | 2007-09-12 | |||
| CN101060092A | 2007-10-24 | |||
| CN108289390A | 2018-07-17 | |||
| CN208029214U | 2018-10-30 |
Attorney, Agent or Firm:
BEIJING LAWSING IP FIRM (CN)
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