Process for making insert molded circuit

• US 4,965,933 A
• Filed: 05/22/1989
• Issued: 10/30/1990
• Est. Priority Date: 05/22/1989
• Status: Expired due to Term

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: Cherry Corporation (ZF Electronics Corp.)
• Inventors: Mraz, James E., Schwarz, Donald P., Schotanus, Joel M., Schwartz, Martin T., Kemp, James M.
• Primary Examiner(s): ECHOLS, PERCY W
• Application Number:
  US07/354,458
• Time in Patent Office: 526 Days
• Field of Search: 29/527.4, 29/876, 29/882, 29/883, 29/412-414, 29/418, 264/163, 264/154, 264/155, 264/272.17, 425/116, 425/292, 425/289, 249/95
• US Class Current: 29/882
• CPC Class Codes: B29C 45/14221 by tools, e.g. cutting means
• CPC Class Codes: B29C 45/14639 for obtaining an insulating effect, e.g. for electrical components
• CPC Class Codes: B29K 2995/0005 Conductive
• CPC Class Codes: H01R 43/24 Assembling by moulding on contact members
• CPC Class Codes: H05K 2201/0382 Continuously deformed conductors
• CPC Class Codes: H05K 2201/09118 Moulded substrate
• CPC Class Codes: H05K 2201/2072 Anchoring, i.e. one structure gripping into another
• CPC Class Codes: H05K 2203/175 Configurations of connections suitable for easy deletion, e.g. modifiable circuits or temporary conductors for electroplating; Processes for deleting connections
• CPC Class Codes: H05K 3/0014 Shaping of the substrate, e.g. by moulding
• CPC Class Codes: H05K 3/202 using self-supporting metal foil pattern
• CPC Class Codes: H05K 3/4092 Integral conductive tabs, i.e. conductive parts partly detached from the substrate
• CPC Class Codes: Y10T 29/49218 with deforming
• CPC Class Codes: Y10T 29/4922 with molding of insulation
• CPC Class Codes: Y10T 29/49792 Dividing through modified portion
• CPC Class Codes: Y10T 29/49799 Providing transitory integral holding or handling portion
• CPC Class Codes: Y10T 29/49986 Subsequent to metal working

Abstract

A method and apparatus are provided for forming insert molded circuits. The process includes inserting a circuit network comprised of a lace curtain with a plurality of individual circuits which are connected by interconnect members into a mold and then separating the individual circuits in the mold by cutting the interconnect members while the lace curtain is in the mold. After the interconnect members have been severed, plastic is injected into the mold thereby surrounding the individual traces. A mold for performing the process is disclosed which includes a retractable punch arrangement.

Claims

1. A method for forming an electrical connector from a lace curtain, wherein the lace curtain includes a plurality of electrical connectors joined by at least one interconnect joint, the method comprising the steps of:

providing a mold having a cavity configured to receive the lace curtain;

inserting the lace curtain in the cavity of the mold;

while the lace curtain is in the mold, severing the interconnect joints; and

after the interconnect joints have been severed, injecting a flowable, insulating material into the mold such that the insulating material surrounds the connectors.

2. The method of claim 1 wherein the step of severing the interconnect joints comprises the steps of:

providing at least one punch for each respective interconnect joint, and disposing the respective punch in a position adjacent the respective interconnect joint;

after the lace curtain has been inserted into the cavity of the mold, moving each respective punch to sever the respective interconnect joint; and

after each respective interconnect joint has been severed, retracting each respective punch.

3. The method of claim 1 further comprising the step of bending one of the severed sections of the interconnect joint away from the other of the severed sections of the interconnect joint after the interconnect joint has been severed.

4. The method of claim 3 wherein the step of injecting the insulating material into the cavity of the mold includes filling the gap between the severed sections of the interconnect joint.

6. The method of claim 1 wherein the step of severing the interconnect joints comprises staking the joints with a punch and die arrangement.

5. The method of claim I wherein the step of injecting the insulating material into the cavity of the mold includes filling the gap between the severed sections of the interconnect joint.

7. A method for making a network of electrical connectors from a lace curtain, wherein the lace curtain includes a plurality of electrical connectors joined by at least one interconnect joint, the method comprising:

providing a mold having a first section and a discrete mating second section, the mold having a closed position when the first and second sections are engaged, the first and second sections each having a mating cavity section;

separating the first and second sections of the mold;

disposing the lace curtain in the cavity of one of the first and second sections of the mold;

after the lace curtain has been inserted, closing the mold;

while the lace curtain is in the mold, severing the interconnect joints; and

after the mold has been closed and after the interconnect joints have been severed, injecting an insulating material into the cavity of the mold.

8. The method of claim 7 wherein the step of injecting the insulating material into the cavity of the mold includes filling the gap between the severed sections of the interconnect joint.

9. The method of claim 7 wherein the step of severing the interconnect joints comprises staking the joints with a punch and die arrangement.

10. The method of claim 9 wherein the step of staking includes using a press to drive the punch and wherein the press is further used to close the mold.

11. The method of claim 7 further comprising the step of bending one of the severed sections of the interconnect joint away from the other of the severed sections of the interconnect joint after the interconnect joint has been severed.

12. The method of claim 11 wherein the step of injecting the insulating material into the cavity of the mold includes filling the gap between the severed sections of the interconnect joint.

13. The method of claim 7 wherein the step of injecting the insulating material into the cavity of the mold includes filling the gap between the severed sections of the interconnect joint.