Heat and pressure glass bonding of spaced magnetic head portions by forming and using glass over flow channels

Claim 1

A METHOD OF MANUFACTURING PARTS OF GLASS BONDED MAGNETIC HEADS COMPOSED OF TWO CIRCUIT PARTS CONSISTING OF SINTERED OXIDIC FERROMAGNETIC MATERIAL AND HAVING GAP SURFACES WITH A GAP THEREBETWEEN FILLED WITH GLASS BONDING THE CIRCUIT PARTS TOGETHER, COMPRISING: FORMING FIRST AND SECOND OVER-FLOW CHANNEL CROSS GROOVES ADJACENT FIRST AND SECOND ENDS RESPECTIVELY OF AT LEAST ONE OF SAID CIRCUIT PART GAP SURFACES, PLACING SPACING MEMBERS HAVING A THICKNESS EQUAL TO THE DESIRED GAP LENGTH AT OPPOSITE ENDS OF A POLISHED GAP SURFACE OF SAID ONE CIRCUIT PART, SAID SPACING MEMBERS EACH OCCUPYING THAT RESPECTIVE AREA OF SAID GAP SURFACE BETWEEN THE END THEREOF AND A RESPECTIVE ONE OF SAID CROSS GROOVES, SAID GAP SURFACE HAVING A PREDETERMINED AREA, PLACING A GLASS ROD ON SAID GAP SURFACE BETWEEN SAID SPACING MEMBERS, SAID GLASS ROD HAVING A VOLUME LARGER THAN THE VOLUME OF THE ULTIMATELY DESIRED GAP, THE SURFACE OF SAID GLASS ROD PLACED ON SAID GAP SURFACE HAVING AN AREA SUBSTANTIALLY LESS THAN SAID PREDETERMINED AREA, THE SMALLEST CROSS-SECTION OF SAID GLASS ROD BEING GREATER THAN THE THICKNESS OF SAID SPACING MEMBERS, PLACING A CORRESPONDING POLISHED GAP SURFACE OF A SECOND CIRCUIT PART ON SAID GLASS ROD, HEATING THE RESULTING ASSEMBLY UNDER PRESSURE TO MELT THE GLASS AND FORM A GAP HAVING A LENGTH EQUAL TO THE THICKNESS OF SAID SPACING MEMBERS, EACH OF SAID CROSS GROOVES FORMING A FLOW CHANNEL FOR SAID MOLTEN GLASS TO PREVENT SAID MOLTEN GLASS FROM DISTURBING THE POSITION OF SAID SPACING MEMBERS, AND COOLING SAID ASSEMBLY TO ALLOW SAID GLASS TO BOND THE CIRCUIT PARTS TOGETHER.

Claim 2

A METHOD OF MANUFACTURING PARTS OF GLASS BONDED MAGNETIC HEADS COMPOSED OF TWO CIRCUIT PARTS CONSISTING OF SINTERED OXIDIC FERROMAGNETIC MATERIAL AND HAVING GAP SURFACES WITH A GAP THEREBETWEEN FILLED WITH GLASS BONDING THE CIRCUIT PARTS TOGETHER, COMPRISING: FORMING FIRST AND SECOND OVER-FLOW CHANNEL CROSS GROOVES ADJACENT FIRST AND SECOND ENDS RESPECTIVELY OF AT LEAST ONE OF SAID CIRCUIT PART GAP SURFACES, PLACING SPACING MEMBERS HAVING A THICKNESS EQUAL TO THE DESIRED GAP LENGTH AT OPPOSITE ENDS OF A POLISHED GAP SURFACE OF SAID ONE CIRCUIT PART, SAID SPACING MEMBERS EACH OCCUPYING THAT RESPECTIVE AREA OF SAID GAP SURFACE BETWEEN THE END THEREOF AND A RESPECTIVE ONE OF SAID CROSS GROOVES, SAID GAP SURFACE HAVING A PREDETERMINED AREA, PLACING A GLASS ROD ON SAID GAP SURFACE BETWEEN SAID SPACING MEMBERS, SAID GLASS ROD HAVING A VOLUME LARGER THAN THE VOLUME OF THE ULTIMATELY DESIRED GAP, THE SURFACE OF SAID GLASS ROD PLACED ON SAID GAP SURFACE HAVING AN AREA SUBSTANTIALLY LESS THAN SAID PREDETERMINED AREA, THE SMALLEST CROSS-SECTION OF SAID GLASS ROD BEING GREATER THAN THE THICKNESS OF SAID SPACING MEMBERS, PLACING A CORRESPONDING POLISHED GAP SURFACE OF A SECOND CIRCUIT PART ON SAID GLASS ROD, HEATING THE RESULTING ASSEMBLY UNDER PRESSURE TO MELT THE GLASS AND FORM A GAP HAVING A LENGTH EQUAL TO THE THICKNESS OF SAID SPACING MEMBERS, EACH OF SAID CROSS GROOVES FORMING A FLOW CHANNEL FOR SAID MOLTEN GLASS TO PREVENT SAID MOLTEN GLASS FROM DISTURBING THE POSITION OF SAID SPACING MEMBERS, AND COOLING SAID ASSEMBLY TO ALLOW SAID GLASS TO BOND THE CIRCUIT PARTS TOGETHER.