Static control device for printed circuit package

• US 4,138,711 A
• Filed: 09/29/1977
• Issued: 02/06/1979
• Est. Priority Date: 09/29/1977
• Status: Expired due to Term

• Current Assignee: Allen-Bradley Company (Rockwell Automation, Inc.)
• Original Assignee: Allen-Bradley Company (Rockwell Automation, Inc.)
• Inventors: Bremenour, Edwin L., McAdams, Timothy E., Rhodes, Clifford A.
• Primary Examiner(s): Smith, Jr., David
• Application Number:
  US05/838,172
• Time in Patent Office: 495 Days
• Field of Search: 361/399, 361/395, 361/405, 361/424, 339/19, 200/51.1, 200/51.11, 200/51.12, 206/328, 206/331, 206/334
• US Class Current: 361/679.31
• CPC Class Codes: H05K 5/026 having standardized interfaces flash memory cards G06K19/077
• CPC Class Codes: H05K 7/1461 Slidable card holders; Card stiffeners; Control or display means therefor
• CPC Class Codes: H05K 9/0067 Devices for protecting against damage from electrostatic discharge

Abstract

A protective package for use with a printed circuit board having mounted thereon at least one semiconductive device susceptible to deleterious effects of variance of potential across the terminals of the device or the presence of static electric discharges. The package provides, in one embodiment, a single piece, insulating case supporting and enclosing the entire circuit board and its components and a shorting member having integrally formed, spring biased contact fingers in normal engagement with the termination pads of the board. The contact fingers are separable from engagement with the termination pads upon insertion of the circuit board into an edge connector. Another illustrated embodiment provides a holder or support for a shorting member which may enclose only a portion of a printed circuit board and only a portion including termination pads.

Claims

1. A lead shorting device for a printed circuit board having mounted thereon at least one semiconductor element having terminals electrically engaging conducting circuit paths on said board, said paths terminating in spaced apart, conducting termination pads, and wherein said circuit board is removably insertable in an elongated connector device having contacts arranged for electrical engagement with respective ones of said termination pads and an insulating housing at least partially surrounding said contacts, said housing defining an exposed camming surface, and wherein said semiconductor device is susceptible to deleterious effects in the presence of a difference in potential across its terminals prior to insertion of said board into said connector device, said lead shorting device including:

an insulating support member adapted for attachment to said circuit board and extending across the termination pads electrically connected to said semiconductor element; and

a conducting terminal shorting member supported by said support member including a plurality of integral, resilient conducting portions arranged for normal engagement with and electrically shorting each of the respective termination pads electrically connected to the semiconductor device, the resilient conducting portions of said shorting member each having cam follower means cooperating with the camming surface of the housing of said connector device for separating said portion from said termination pads upon insertion of said circuit board into said connector device.

2. The invention in accordance with claim 1, wherein the said insulating support member is elongated and has a base for attachment to said circuit board and an integral sidewall portion spaced from said termination pads, and wherein said conducting shorting member is attached to said sidewall portion.

3. The invention in accordance with claim 1, wherein the said insulating support member comprises a cover member molded of insulating material and further including an enclosing wall surface defining a cavity for receiving and covering the semiconductor element, the conducting circuit paths engaging the terminals of said element and the said termination pads.

4. The invention in accordance with claim 1, wherein the said insulating support member is of a molded unitized construction comprising two sidewalls joined by an integral longitudinal hinge portion, said hinge portion being configured to provide an intermediate relatively flat surface and oppositely disposed grooves, whereby when said sidewalls of said cover member are folded together with one edge of said circuit board abutting said flat surface, said circuit board will be clamped between said sidewall members at said hinge portion.

5. The invention in accordance with claim 1, wherein the semiconductor device is an integrated circuit memory logic component.

6. The invention in accordance with claim 1, wherein said conducting shorting member comprises a metallic stamping including a base portion fastened to the sidewall of said support member, said resilient conducting portion comprising a plurality of spaced apart contact fingers extending laterally from said base portion and in normally closed engagement with respective ones of said termination pads, said contact fingers being further configured for sliding engagement with the camming surface of the housing of said connector device to provide said means for separation of said fingers from the respective termination pads upon insertion of said circuit board into said connector device.

7. The invention in accordance with claim 4, wherein said circuit board includes spaced apart termination pads on opposite sides of said board, and wherein a conducting shorting member is provided for engagement with the oppositely disposed termination pads and comprises a pair of metallic stampings, each having a portion fastened to a respective sidewall of said cover member, said resilient conducting portion comprising a plurality of spaced apart contact fingers extending laterally from the respective base portions of each of said stampings and in normally closed engagement with respective ones of said termination pads, said contact fingers being further configured for sliding engagement with the camming surface of the housing of said connector device to provide said means for separation of said fingers from the respective termination pads upon insertion of said circuit board into said connector device.

8. The invention in accordance with claim 6, wherein each of said contact fingers is provided with a camming surface for sliding engagement with said connector device during insertion and removal of said circuit board relative to said connector device.

9. The invention of claim 4, wherein said sidewalls include inwardly depending surfaces defining respective cavities for receiving said printed circuit board and devices mounted thereon and to provide a means of spacing said sidewalls from said board and devices.

10. The invention of claim 4, wherein releasable fastening means are provided to hold said folded sidewalls together and to further secure said circuit board between said sidewalls.

11. The invention of claim 3, wherein said enclosing wall surface includes a window portion of a material capable of transmitting ultraviolet light to said semiconductor element, and wherein said semiconductor element includes a logic memory erasable in the presence of ultraviolet light.