公开(公告)号：US3602684A

公开(公告)日：1971-08-31

申请号：US3602684D

申请日：1969-10-27

Applicant: HUGHES AIRCRAFT CO

Inventor： FRIESS RICHARD G

IPC: B23K20/26 ,  B23K20/00 ,  G05D23/24 ,  B23K11/24

CPC classification number: H01L24/85 ,  B23K20/007 ,  B23K2201/36 ,  G05D23/1913 ,  G05D23/24 ,  H01L24/48 ,  H01L2224/48 ,  H01L2224/85 ,  H01L2224/85203 ,  H01L2924/00014 ,  H01L2924/01005 ,  H01L2924/01006 ,  H01L2924/01014 ,  H01L2924/01015 ,  H01L2924/01019 ,  H01L2924/0102 ,  H01L2924/01023 ,  H01L2924/01027 ,  H01L2924/01032 ,  H01L2924/01033 ,  H01L2924/01039 ,  H01L2924/01043 ,  H01L2924/01046 ,  H01L2924/01047 ,  H01L2924/0105 ,  H01L2924/01055 ,  H01L2924/01058 ,  H01L2924/01059 ,  H01L2924/01068 ,  H01L2924/01074 ,  H01L2924/01079 ,  H01L2924/01082 ,  H01L2924/014 ,  H01L2924/12035 ,  H01L2924/13034 ,  H01L2924/19041 ,  H01L2924/19043 ,  H01L2224/45099 ,  H01L2224/05599 ,  H01L2924/00

Abstract: A pulsed thermocompression bonder is provided comprising a bonding or capillary tip and an electronics system to regulate the bonding or capillary tip temperature. A switch automatically provides a start bond signal when the operator lowers the bonder tip to bonding position to commence a bonding operation. The start bond signal activates an AC control circuit which causes current flow in a heating transformer until the tip is at predetermined bonding or operating temperature. The AC control circuit then stops current flow from being supplied to the heating transformer for a predetermined cooling time. In subsequent sequential periods iteratively the current is allowed to flow to the heating transformer until a predetermined temperature is reached and is cut off for the predetermined period of cooling. Adjustment means are provided to regulate offand-on current time so that once the predetermined desired temperature is reached an approximately constant desired temperature or flat heat curve is obtained until the end of the bonding operation. A sensing circuit connected to the bonder tip senses a rise in voltage due to an increase in tip resistance when the tip is being heated to the predetermined bonding temperature. After rising to desired predetermined temperature the sensing circuit (1) triggers a timing one shot multivibrator which sets and resets an on-off flip-flop circuit to regulate the heating cycle duration for a given bonding operation and (2) triggers an on-off one-shot multivibrator each time the predetermined temperature is reached in the heating cycle. The voltage outputs of the on-off flip-flop and one-shot multivibrator circuits are mixed and applied to the AC control circuit. The on-off one-shot multivibrator stops current flow to the heating transformer for the predetermined period upon each sensing of reaching the predetermined operating temperature during the bonding cycle. The on-off flip-flop as determined by the timing one shot multivibrator changes state and terminates the bonding cycle.

公开(公告)号：US3374391A

公开(公告)日：1968-03-19

申请号：US53143266

申请日：1966-03-03

Applicant: HUGHES AIRCRAFT CO

Inventor： FRIESS RICHARD G

IPC: H04N3/20

CPC classification number: H04N3/20

公开(公告)号：US3659074A

公开(公告)日：1972-04-25

申请号：US3659074D

申请日：1970-04-13

Applicant: HUGHES AIRCRAFT CO

Inventor： FRIESS RICHARD G

IPC: B23K11/25 ,  B23K11/24

CPC classification number: B23K11/252

Abstract: Resistance welder supplies an AC preheat current to the workpiece, followed by a DC weld pulse.

Abstract translation: 电阻焊机向工件提供交流预热电流，然后是直流焊接脉冲。

公开(公告)号：US3604888A

公开(公告)日：1971-09-14

申请号：US3604888D

申请日：1970-02-26

Applicant: HUGHES AIRCRAFT CO

Inventor： FRIESS RICHARD G ,  HOUGEN TOR

IPC: B23K11/26

CPC classification number: B23K11/26

Abstract: A charged capacitor is connected in series with a pulse welder transformer primary and a switching SCR. The weld control circuit is connected to fire the SCR, when the weld pulse is required. A transistor connected across the SCR shunts the SCR to positively reduce the SCR current below its holding current value. The SCR current is measured so that the transistor is not turned on until the current is at a safe value.