Heat dissipation device

A heat dissipation device, comprising:

• a heat dissipation fin group, having a plurality of fins, the fins are arranged along an extension direction and are divided into a first fin group, a second fin group, and a third fin group, the third fin group is disposed between the first fin group and the second fin group, wherein each fin of the first fin group and the second group includes a plurality of through holes, and each fin of the third fin group includes a plurality of notches;
• a plurality of heat pipes, which are cylindrical structure, the heat pipes are disposed through the first fin group and the second fin group by the through holes, and a part of the heat pipes corresponding to the third fin group is in contact with the notches, and another part is exposed to the outside, wherein the plurality of heat pipes are extended along the extension direction;
• and
• a vapor chamber, correspondingly disposed on the third fin group, and having a plurality of grooves, the vapor chamber is in contact with the heat pipes exposed from the grooves, wherein the grooves extend along the extension direction and have a shape associated with the cylindrical structure,
• wherein the notches are arranged along the extension direction to form a plurality of positioning grooves, and each of the grooves and each of the positioning grooves respectively cover the lower and upper halves of the heat pipes,
• wherein the whole body of each of the heat pipes has a straight heat pipe structure that is parallel to the vapor chamber and the heat dissipation group.