Surface mount test point enabling hands-free diagnostic testing of electronical circuits

• US 5,833,479 A
• Filed: 06/27/1996
• Issued: 11/10/1998
• Est. Priority Date: 09/15/1994
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Nokia Telecommunications Oy (Nokia Corporation)
• Inventors: Talbot, Andrew
• Primary Examiner(s): Abrams, Neil
• Assistant Examiner(s): PATEL, TULSIDAS C
• Application Number:
  US08/640,980
• Time in Patent Office: 866 Days
• Field of Search: 439/78, 439/888, 324/72.5, 174/267
• US Class Current: 439/83
• CPC Class Codes: G01R 1/04 Housings; Supporting members; Arrangements of terminals
• CPC Class Codes: G01R 31/2818 using test structures on, or modifications of, the card under test, made for the purpose of testing, e.g. additional components or connectors G01R31/2805 takes precedence; printed circuits having, e.g. symbols, test patterns or visualisation means H05K1/0266
• CPC Class Codes: H01R 12/57 surface mounting terminals
• CPC Class Codes: H05K 3/4015 using auxiliary conductive elements, e.g. pieces of metal foil, metallic spheres

Abstract

A test point enabling hands-free diagnostic testing of electronical circuits, has a body with two planar, at least substantially parallel end surfaces which are spaced apart and face opposite directions. The end surfaces are connected with each other by a waist portion which is in electrical contact with at least one of the end surfaces.

Claims

1. A surface mount test point enabling hands-free diagnostic testing of electronic circuits, comprising:

a body having two axially spaced, axially opposite end flanges which are physically interconnected by a waist portion which extends between said end flanges;

said end flanges having respective axially outer surfaces which are substantially planar and disposed in planes which are substantially parallel to one another;

said waist portion and at least one of said axially outer surfaces being made of electrically conductive metallic material, and being in electrical contact with one another; and

said one of said axially outer surfaces being solderable to a printed circuit board for surface mounting said test point to the printed circuit board.

2. The test point of claim 1, wherein:

the other of said axially outer surfaces also is made of electrically conductive metallic material, and is in electrical contact with said waist portion.

3. The test point of claim 1, wherein:

said end flanges and said waist portion are each circular in transverse cross-sectional profile; and

each end flange further includes an annular radially inner frusto-conical surface.

4. The test point of claim 3, further comprising:

a respective radiused fillet disposed between said waist portion and each said frusto-conical surface.

5. The test point of claim 3, wherein:

on each said end flange, the respective frusto-conical surface is disposed at an angle of between 0° and

40°

to the respective axially outer surface.

6. The test point of claim 2, wherein:

said end flanges and said waist portion are each circular in transverse cross-sectional profile;

each end flange further includes an annular radially inner frusto-conical surface; and

said body is symmetrical about an imaginary plane which bisects said waist portion at a right angle to the longitudinal axis of said waist portion, midway between said planes of said axially outer surfaces.

7. The test point of claim 1, wherein:

said body is made of solid metal in one piece.

8. The test point of claim 2, wherein:

said axially outer surfaces are equal in diameter and are axially spaced from one another by a distance which is from 0.5 to 0.8 times the diameter of each said axially outer surface.

9. The test point of claim 1, wherein:

said body is made of tin-plated brass.

10. The test point of claim 9, wherein:

each said axially outer surface has a diameter of from 2 to 4 mm.

11. A test point placement assembly, comprising:

a surface mount device tape having a longitudinal series of pockets and a longitudinal series of tape drive engagement features;

each of aid pockets extending in a thickness direction of said tape and having disposed therein, for placement by a surface mount device placement machine vacuum nozzle, a respective surface mount test point enabling hands-free diagnostic testing of electronic circuits;

each said test point comprising;

a body having two axially spaced, axially opposite end flanges which are physically interconnected by a waist portion which extends between said end flanges;

said end flanges having respective axially outer surfaces which are substantially planar and disposed in planes which are substantially parallel to one another;

said waist portion and at least one of said axially outer surfaces being made of electrically conductive metallic material, and being in electrical contact with one another; and

said one of said axially outer surfaces being solderable to a printed circuit board for surface mounting said test point to the printed circuit board.