An acoustic pressure type sensor is fabricated on a supporting substrate by depositing and etching a number of thin films on the supporting substrate and by machining the supporting substrate. A transparent casing accommodates the bow and thus retain the ornamental member in the hole of the bow. In addition, the method includes compressing the microcode memory using a cluster-based compression technique, wherein clusters are selected according to a chromosome from the new population with the best fitness value. Advantageously, the support structure and frame can create a lightweight basketball backboard with consistent rebounding characteristics. The individual conductors encased in the casing can be electrically separated by punching out a connecting conductive structure through a hole formed in the casing. The current conductors occupy a predetermined position with respect to one another in the lamp owing to the use of the shaped metal body, and fewer components have to be combined in the manufacture of the lamp.