Key structure with light-guiding function

A key structure for a keyboard base and a plurality of light-emitting sources installed on the keyboard base, the key structure comprising:

• a lower shell fixedly connected to the keyboard base;
• an upper shell assembled above the lower shell, wherein the upper shell is made of transparent plastic material, the upper shell comprising a through opening, wherein the upper shell comprises a top wall and an annular peripheral wall at least partially surrounding a peripheral edge of the top wall, and wherein the plurality of light guide columns are each molded to extend downwardly from two sides of the bottom of the annular peripheral wall;
• a plurality of light guide columns extending downwardly from two sides of the upper shell, wherein the plurality of light guide columns and the plurality of light-emitting sources are arranged opposite to each other;
• a pressing shaft movably disposed between the lower shell and the upper shell, wherein a top end of the pressing shaft penetrates through the through opening;
• and
• a spring disposed and elastically supported between the lower shell and the pressing shaft.