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Machine translation
1. (WO1981000368) BACKUP MATERIAL AND METHOD FOR DRILLING
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/000368    International Application No.:    PCT/US1980/000961
Publication Date: 19.02.1981 International Filing Date: 28.07.1980
IPC:
B23B 35/00 (2006.01), B23Q 11/12 (2006.01), H05K 3/00 (2006.01)
Applicants:
Inventors:
Priority Data:
61592 30.07.1979 US
Title (EN) BACKUP MATERIAL AND METHOD FOR DRILLING
(FR) MATERIAU DE SOUTIEN UTILISE DANS LE PERCAGE DE PLAQUES DE CIRCUITS IMPRIMES
Abstract: front page image
(EN)Backup material is formed from a pair of oppositely positioned metallic foil sheets (11, 12) between which an open metallic core (14) having oppositely running node portions (14a, 14b) is sandwiched. The core may be sinusoidal with each node extending from one of the edges of the sheets to the opposite edges. This sandwich core backup material is placed beneath a printed circuit board (20) to be drilled, such that with drilling, the drill penetrates through the top sheet and not the bottom sheet, thus terminating in the area of the open core. The backup material the formation of burrs around the holes drilled in the circuit board and at the same time facilitates cooling the drill and the workpiece and the removal of cuttings therefrom.
(FR)Un materiau de soutien est forme a partir d"une paire de feuilles metalliques opposees (11, 12) entre lesquelles un noyau metallique ouvert (14) ayant des portions nodales opposees (14a, 14b) est pris en sandwich. Le noyau peut etre sinusoidal, chaque noeuds s"etendant a partir d"un des bords des feuilles vers les bords opposes. Ce materiau de soutien du noyau en sandwich est place sous une plaque de circuit imprime (20) a percer, de sorte qu"en cours du percage, le foret penetre au travers de la feuille superieure et non de la feuille du fond, s"arretant ainsi dans la region du noyau ouvert. Le materiau de support empeche la formation de barbes autour des trous perces dans la plaque de circuit et en meme temps facilite le refroidissement du foret et de la piece a usiner ainsi que le degagement des copeaux.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)