Abstract: A method for manufacturing a ceramic substrate is characterized in using a preformed trench, a patterned protective layer and a sand blasting process to manufacture a cavity in a ceramic substrate and control the cavity size and shape of the ceramic substrate. The ceramic substrate is collocated with a base substrate to form a package substrate for packaging a semiconductor chip. The manufacturing method set forth above can lower the manufacturing cost and raise the accuracy of the size and shape of the cavity of the ceramic substrate. The abovementioned method can reduce the fabrication cost and increase the precision of the shape and size of a ceramic substrate.

Abstract: A method for manufacturing a ceramic substrate is characterized in using a preformed trench, a patterned protective layer and a sand blasting process to manufacture a cavity in a ceramic substrate and control the cavity size and shape of the ceramic substrate. The ceramic substrate is collocated with a base substrate to form a package substrate for packaging a semiconductor chip. The manufacturing method set forth above can lower the manufacturing cost and raise the accuracy of the size and shape of the cavity of the ceramic substrate. The abovementioned method can reduce the fabrication cost and increase the precision of the shape and size of a ceramic substrate.

Abstract: A Chinese multifont recognition system, in which a scanner can input Chinese character pattern data into a recognition system to recognize all characters to complete the chinese input operation. The recognition system can recognize various printed fonts and chinese characters in various sizes. The recognition method is arranged that all the Chinese characters to be recognized are to be put in the system; all the features of a Chinese character are extracted, and stored in a feature data base. Later, any input Chinese character will recognized in accordance with the data base. Since it is a technique of extracting the features of a character pattern, the system can recognize the multifont Chinese characters. If it is necessary to expand the number of characters in the data base established originally, a character feature learning system may be used for storing new characters therein.