Heated tool with non-flat heating surface for avoiding solder-bridging

• US 4,918,277 A
• Filed: 07/06/1988
• Issued: 04/17/1990
• Est. Priority Date: 07/09/1987
• Status: Expired due to Fees

• Current Assignee: Patentech Incorporated
• Original Assignee: Productech GmbH
• Inventors: Zimmer, Gero
• Primary Examiner(s): Jennings, Derek S.
• Assistant Examiner(s): Osborn, David
• Application Number:
  US07/215,628
• Time in Patent Office: 650 Days
• Field of Search: 219/56, 219/56.1, 219/56.21, 219/56.22, 219/85 D, 219/85 F, 219/85 R, 219/243, 219/85.1, 219/85.16, 219/85.18, 228/51, 228/54, 228/180.2, 228/215
• US Class Current: 219/56.1
• CPC Class Codes: B23K 20/025 Bonding tips therefor
• CPC Class Codes: B23K 3/0471 using resistance rod or bar, e.g. carbon silica
• CPC Class Codes: H01R 12/62 connecting to rigid printed circuits or like structures
• CPC Class Codes: H01R 43/02 for soldered or welded connections
• CPC Class Codes: H05K 2201/10356 Cables
• CPC Class Codes: H05K 2203/0195 Tool for a process not provided for in H05K3/00, e.g. tool for handling objects using suction, for deforming objects, for applying local pressure
• CPC Class Codes: H05K 2203/0278 Flat pressure, e.g. for connecting terminals with anisotropic conductive adhesive
• CPC Class Codes: H05K 3/3405 Edge mounted components, e.g. terminals
• CPC Class Codes: H05K 3/3494 Heating methods for reflowing of solder using integral heating means H05K1/0212

Abstract

A heated tool for soldering objects to a plurality of pads which are spaced apart by a selected pitch, comprises a tool member having a heating surface with a plurality of spacer bars thereon, spaced by the pitch between the pads. The spacer bars act to separate one pad from the other to avoid the flow of solder between the pads.

Claims

1. A heated tool for connecting objects to a plurality of pads which are spaced from each other by a certain distance, comprising a tool member having a heated bar with a heating surface for each pad and at least one spacer bar connected to said tool member and disposed between said heating surfaces for isolating an object on one pad from an object on another pad, said tool member having different cross-sectional areas at said heating surface and said spacer bar for providing different amounts of heat, each spacer bar having a width selected to be at least greater than the certain distance between the pads for directly contacting the pads to transfer heat to the pads for connecting the objects to the pads.

2. A heated tool according to claim 1 wherein the spacer bar is made as one piece with the tool member and heating surface.

3. A heated tool according to claim 1 wherein said spacer bar is made as separate parts from said tool member, and is connected to said tool member adjacent said heating surface.

4. A heated tool according to claim 1 wherein said spacer bar is coated with a material which is different from that of said tool member.

5. A heated tool according to claim 4 wherein said material coating has a low wetting affinity for solder.

6. A heated tool according to claim 1 including defining a plurality of spacer bars by cutting slots into the tool member to also form said heating surfaces.

7. A heated tool for connecting objects to a plurality of pads which are spaced from each other by a certain distance, comprising a tool member having a heating bar with a heating surface for each pad and at least one spacer bar connected to said tool member and disposed between said heating surfaces for isolating an object on one pad from an object on another pad, and a projection extending from spacer bar.

8. A heated tool according to claim 7 including a plurality of spacer bars, said heating surface with said spacer bars being non-flat, said spacer bars being spaced from each other by about the certain distance between the pads.

9. A heated tool according to claim 7 wherein the spacer bar is made from as one piece with the tool member and heating surface.

10. A heated tool according to claim 7 wherein said spacer bar is made as separate parts from said tool member, and is connected to said tool member adjacent said heating surface.

11. A heated tool according to claim 7 wherein said spacer bar is coated with a material which is different from that of said tool member.

12. A heated tool according to claim 11 wherein said material coating has a low wetting affinity for solder.

13. A heated tool according to claim 7 including defining a plurality of spacer bars by cutting slots into the tool member to also form said heating surfaces.

14. A heated tool according to claim 7 wherein each spacer bar has a width selected to be at least greater than the certain distance between the pads for directly contacting the pads to transfer heat to the pads for connecting the objects to the pads.

15. A heated tool for connecting objects to a plurality of pads which are spaced from each other by a certain distance, comprising a tool member having a heating bar with a heating surface for each pad and at least one spacer bar connected to said tool member and disposed between said heating surfaces for isolating an object on one pad from an object on another pad, said spacer bar being narrower than the distance between the pads for engaging between the pads when said tool member is brought close to the pads for connecting the objects to the pads.

16. A heated tool according to claim 15 including a plurality of spacer bars, said heating surface with said spacer bars being non-flat, said spacer bars being spaced from each other by about the certain distance between the pads.

17. A heated tool according to claim 15 wherein the spacer bar is made from as one piece with the tool member and heating surface.

18. A heated tool according to claim 15 wherein said spacer bar is made as separate parts from said tool member, and is connected to said tool member adjacent said heating surface.

19. A heated tool according to claim 15 wherein said spacer bar is coated with a material which is different from that of said tool member.

20. A heated tool according to claim 19 wherein said material coating has a low wetting affinity for solder.

21. A heated tool according to claim 15 including defining a plurality of spacer bars by cutting slots into the tool member to also form said heating surfaces.