Thin hard drive with 2-piece-casing and ground pin standoff to reduce ESD damage to stacked PCBA's

• US 7,576,990 B2
• Filed: 03/07/2007
• Issued: 08/18/2009
• Est. Priority Date: 01/06/2000
• Status: Expired due to Fees

• Current Assignee: Super Talent Technology, Corporation
• Original Assignee: Super Talent Electronics, Inc.
• Inventors: Ni, Jim Chin-Nan, Shen, Ming-Shiang, Ma, Abraham C., Lee, Charles C.
• Primary Examiner(s): Bui; Hung S
• Application Number:
  US11/683,292
• Publication Number:
  US 20070183209A1
• Time in Patent Office: 895 Days
• Field of Search: 174/52.2, 361/737, 361/600, 361/715, 439/76.1, 439/946
• US Class Current: 361/737
• CPC Class Codes: G06F 12/1416 by checking the object accessibility, e.g. type of access defined by the memory independently of subject rights G06F12/1458 takes precedence
• CPC Class Codes: G06F 21/32 using biometric data, e.g. fingerprints, iris scans or voiceprints
• CPC Class Codes: G06F 21/78 to assure secure storage of data address-based protection against unauthorised use of memory G06F12/14; record carriers for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: G06K 19/07 with integrated circuit chips
• CPC Class Codes: G06K 19/07354 by biometrically sensitive means, e.g. fingerprint sensitive fingerprint sensors in general G06V40/12; biometrically activated access control G07C9/25
• CPC Class Codes: G06V 40/1365 Matching; Classification
• CPC Class Codes: G07C 9/257 electronically G07C9/26 takes precedence
• CPC Class Codes: H05K 5/026 having standardized interfaces flash memory cards G06K19/077
• CPC Class Codes: H05K 5/0269 Card housings therefor, e.g. covers, frames, PCB

Abstract

A case-grounded flash-memory drive has a printed-circuit board assembly (PCBA) with flash-memory chips and a controller chip. The PCBA is encased inside an upper case and a lower case, with a Serial AT-Attachment (SATA) connector that fits through and opening between the cases. The cases can be assembled with the PCBA by a snap-together, ultrasonic-press, screw-fastener, or thermal-bond adhesive method. Dual-axis case-grounding pins draw any electro-static-discharges (ESD) current off the upper case along a primary axis and onto a PCBA ground through a secondary axis washer that is screwed into the PCBA. The primary axis body of the dual-axis case-grounding pins fits around a PCBA notch while the secondary axis passes through a metalized alignment hole for grounding. When the SATA connector is inserted into a host, the host ground sinks ESD currents collected by the dual-axis case-grounding pins.

Claims

1. A flash-memory drive comprising:

an upper case;

a lower case;

a printed-circuit board assembly (PCBA) that comprises;

a circuit board having wiring traces;

a plurality of flash-memory chips mounted to the circuit board;

a controller chip mounted to the circuit board, the controller chip having a input/output interface circuit for interfacing to an external computer, and a processing unit for accessing the plurality of flash-memory chips in response to commands from the external computer received by the input/output interface circuit; and

a connector mounted to the circuit board, for connecting the controller chip to the external computer;

wherein the upper case is attached to the lower case during assembly with the PCBA between the upper case and the lower case, with the connector passing through an opening between the upper case and the lower case, the upper and lower cases encapsulating the circuit board,

wherein the plurality of flash-memory chips are block-addressable and not randomly-addressable;

a conductive pin that contacts the upper case and contacts ground traces the circuit board, wherein the ground traces connect to a chassis ground through the connector when the connector is connected to the external computer;

wherein the conductive pin comprises a primary axis and a secondary axis that are substantially parallel to and offset from each other and substantially perpendicular to a plane of the circuit board;

wherein conductive pin contacts the upper case along the primary axis;

wherein the conductive pin contacts the circuit board around an alignment hole that is centered about the secondary axis,

whereby the conductive pin has primary and secondary axes.

2. The flash-memory drive of claim 1 wherein the conductive pin further comprises:

a primary body along the primary axis that contacts the upper case;

a secondary axis washer for contacting the ground traces around the alignment hole;

whereby the primary axis if for contacting the upper case and the secondary axis is for contacting the circuit board.

3. The flash-memory drive of claim 2 further comprising:

a case-grounding pin recess formed on the upper case along the primary axis, the case-grounding pin recess for receiving a portion of the primary body of the conductive pin; and

a plastic standoff pedestal formed on the upper case next to the case-grounding pin recess, the plastic standoff pedestal formed along the secondary axis and for supporting the circuit board.

4. The flash-memory drive of claim 3 further comprising:

a cutout hole formed in the upper case; and

a cutout tab on the conductive pin for inserting into the cutout hole of the upper case,

whereby the conductive pin is held to the upper case by the cutout tab fitting into the cutout hole.

5. The flash-memory drive of claim 3 further comprising:

a screw fastener, inserted into the alignment hole in the circuit board, through the secondary axis washer of the conductive pin, and into the plastic standoff pedestal, to fasten the circuit board to the upper case and to the conductive pin during assembly,

whereby the upper case, alignment hole, and plastic standoff pedestal are screwed together along the secondary axis.

6. The flash-memory drive of claim 5 wherein the screw fastener is further inserted through the lower case along the secondary axis,

whereby the upper case and lower case are screwed together.

7. The flash-memory drive of claim 1 further comprising:

a second circuit board that is substantially parallel to the circuit board;

standoffs between the circuit board and the second circuit board,

wherein a second plurality of flash-memory chips are mounted to the second circuit board,

whereby a stack of circuit boards are encapsulated by the upper case and the lower case.

8. The flash-memory drive of claim 7 wherein the standoffs are along the secondary axis.

9. The flash-memory drive of claim 7 further comprising:

a first connector on the circuit board that mates with a second connector on the second circuit board.

10. The flash-memory drive of claim 7 further comprising:

a flex cable between the circuit board and the second circuit board.

11. The flash-memory drive of claim 7 wherein the circuit board is formed from a first portion of a flexible substrate;

wherein the second circuit board is formed from a second portion of a flexible substrate;

wherein the flexible substrate is folded between the first portion and the second portion to form the stack of circuit boards.

12. The flash-memory drive of claim 1 further comprising:

locking tabs formed on sidewalls of the lower case;

engagement slots formed on sidewalls of the upper case;

wherein the locking tabs snap into the engagement slots during assembly to lock the upper case into the lower case;

whereby the upper case and the lower case are assembled by a snap-together method.

13. The flash-memory drive of claim 1 further comprising:

an ultrasonic ridge formed on the lower case, for touching and melting into the upper case during assembly when the upper case is vibrated with ultrasonic energy with respect to the lower case,

whereby the upper case and the lower case are bonded by ultrasonic energy absorbed by the ultrasonic ridge.

14. The flash-memory drive of claim 1 further comprising:

an upper adhesive film disposed between the lower case and the upper case during assembly;

a lower adhesive film disposed between the PCBA and the lower case during assembly;

whereby the lower adhesive film bonds the lower case to the PCBA and the upper adhesive film bonds the lower case to the upper case during assembly.

15. The flash-memory drive of claim 14 wherein the upper adhesive film and the lower adhesive film are thermally activated by an elevated temperature.

16. The flash-memory drive of claim 1 wherein the connector is an integrated device electronics (IDE) connector or a small-computer system interface (SCSI) connector or a Serial AT-Attachment (SATA) connector, or a compact flash, PCI Express, ExpressCard, or Firewire (IEEE 1394) connector.

17. A flash-memory device comprising:

upper case means for partially encasing the flash-memory device;

lower case means for partially encasing the flash-memory device;

a printed-circuit board assembly (PCBA) that comprises;

circuit board means for connecting chips with wiring traces;

a plurality of flash-memory chip means for storing blocks of data, the plurality of flash-memory chip means being mounted to the circuit board means, wherein the plurality of flash-memory chip means are block-addressable and not randomly-addressable;

controller chip means, mounted to the circuit board means, for controlling access to the plurality of flash-memory chip means, the controller chip means comprising an input/output interface means for interfacing to an external computer, and processing unit means for accessing the plurality of flash-memory chip means in response to commands from the external computer received by the input/output interface means; and

connector means, mounted to the circuit board means, for connecting the controller chip means to the external computer;

dual-axis case-grounding pin means for conducting static-electric currents from the upper case means to the PCBA, the dual-axis case-grounding pin means contacting the upper case means at a primary axis, and making electrical contact to the circuit board means at a secondary axis, wherein the primary axis and the secondary axis are parallel to each other and perpendicular to a major surface of the circuit board means;

wherein the upper case means is attached to the lower case means during assembly with the PCBA between the upper case means and the lower case means, with the connector means passing through an opening between the upper case means and the lower case means.

18. The flash-memory device of claim 17 further comprising:

ultrasonic ridge means, formed on the upper case means, for touching the lower case means when ultrasonic energy is applied while pressing the upper case means into the lower case means, the ultrasonic ridge means for ultrasonically bonding the upper case means into the lower case means,

whereby the upper case means is ultrasonically bonded to the lower case means by the ultrasonic ridge means.

19. The flash-memory device of claim 17 further comprising:

locking tab means, formed on the lower case means, for locking the lower case means to the upper case means during assembly;

engagement slot means, formed on the upper case means, for receiving the locking tab means on the lower case means when the lower case means is inserted into the upper case means, the engagement slot means for engaging the locking tab means;

whereby the upper case means is snap-coupled to the lower case means by the locking tab means.