News Column

Patent Issued for Printed Circuit Board Injector/Ejector Mechanism

June 25, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Feroli, Lawrence J. (West Townsend, MA); Sullivan, Kenneth M. (Hudson, MA); Beinor, Jr., Albert F. (Sutton, MA), filed on June 28, 2012, was published online on June 10, 2014.

The assignee for this patent, patent number 8747132, is EMC Corporation (Hopkinton, MA).

Reporters obtained the following quote from the background information supplied by the inventors: "As is known in the art, in many computer applications a chassis houses Central Processor Units (CPUs) and memory boards (i.e., memory cards) electrically interconnected through a motherboard. In one layout, each CPU is disposed on and electrically connected to the motherboard and the memory cards are vertically inserted into slot connectors disposed on and electrically connected to the motherboard. With such an arrangement, routing limitations and board real estate in rack width form factor does not, in some applications, leave sufficient room to attach multiple DIMMs per channel with quad socket (BGA 2011 pin) implementation.

"In order to reduce the surface space occupied by the CPUs and memory cards, in one arrangement, a vertically extending memory board printed circuit board is plugged into an edge card connector that is mounted to the motherboard. The vertically extending memory board printed circuit board is positioned adjacent to one side of the CPU. The memory cards are then plugged into the memory card printed circuit board in a vertical stacked arrangement; i.e., one memory card above another memory card and facing away from the region occupied by the CPU. The use of an edge connector however does not provide the requisite data transfer speed and signal integrity in many applications as for example where transfers in the order of 1866 mega transfers per second are required between the memory and CPU."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "In accordance with the present disclosure, an arrangement is provided having: a motherboard; a processor electrically to, and mounted on, a portion of a surface of the motherboard; a memory card printed circuit board; a plurality of memory cards is plugged into memory board slot type connectors on a surface of the memory card printed circuit board with the surface of the memory card printed circuit board being perpendicular to the surface of the motherboard; and a right angle backplane connector having: a first end disposed perpendicular to, and electrically connected to the surface of a motherboard and a second end disposed on the surface of, and electrically connected to, the memory card printed circuit board.

"With such an arrangement, two DIMMs per channel may be fit into a BGA 2011 quad socket server motherboard. More particularly, with such an arrangement, it is possible to physically fit 32 DIMM slots per motherboard; use the full height of DDR3 DIMMs; use shorter trace length and thereby improved signal integrity; use shorter connector length and thereby improved signal integrity; fit 32 DIMM sockets and 4 BGA2011 CPU sockets in a 2 U tall rack space; use full height industry standard DDR3 memory modules; and maximize signal integrity by tuning wafer in right angle connector for single ended performance. In one embodiment, the arrangement includes: a motherboard; a processor electrically to, and mounted on, a portion of a surface of the motherboard; a memory card printed circuit board;

"a plurality of memory board slot type connectors arranged in rows and mounted on, and electrically connected to, a surface of the memory card printed circuit board; a plurality of memory cards, each one being plugged into a corresponding one of the plurality of memory board slot type connectors; a right angle backplane connector having: a first end disposed perpendicular to the surface of the motherboard, the first end being electrically to, and mounted vertically on, a different portion of a surface of the motherboard; and a second end, disposed at a right angles to the first end and disposed on the surface of, and electrically connected to, the memory card printed circuit board; wherein the surface of the memory card printed circuit board is perpendicular to the surface of the motherboard and the plurality of memory cards is parallel to the surface of the motherboard.

"In one embodiment, portions of the plurality of memory cards are suspended by the memory card printed circuit board over portions of the processor.

"In one embodiment, the arrangement includes: a second a memory card printed circuit board and a second plurality of memory board slot type connectors arranged in rows and mounted on, and electrically connected to, a surface of the second memory card printed circuit board. A second plurality of memory cards is provided, each one being plugged into a corresponding one of the second plurality of memory board slot type connectors. A second right angle backplane connector is provided having: a first end disposed perpendicular to the surface of the motherboard, the first end being electrically to, and mounted vertically on, a second different portion of a surface of the motherboard; and a second end, disposed at a right angles to the first end of the second right angle backplane connector and disposed on the surface of, and electrically connected to, the memory card printed circuit board. The surface of the second memory card printed circuit board is perpendicular to the surface of the motherboard and the plurality of memory cards is parallel to the surface of the motherboard. The first-mention memory card printed circuit board and the second the memory card printed circuit board are on opposite sides on the CPU.

"In one embodiment, the second plurality of memory cards are suspended by the second memory card printed circuit board over portions of the processor.

"In one embodiment, the first-mention memory card printed circuit board and the second the memory card printed circuit board are on opposite sides on the CPU.

"In one embodiment, the first-mention memory cards have distal ends projecting towards distal ends of the second memory cards.

"In one embodiment, a heat sink is provided having a base portion disposed over the CPU and having a vertical portion disposed between the distal ends of the first-mention memory card and the distal ends of the second memory cards.

"In one embodiment, the right angle backplane connector comprises: electrical wires connected to the memory cards through the memory card printed circuit board and the plurality of memory board slot type connectors, each one being plugged into a corresponding one of the plurality of memory board slot type connectors; and ground plane plates disposed between the wires.

"In one embodiment, an ejector is provided for removing a printed circuit board plugged into an electrical connector from an electrical connector receptacle mounted to a motherboard. The injector/ejector mechanism includes: a pair of cams having: a pair of arms connected to pivot points on at opposite ends of side portions of the printed circuit board; distal end of each of the arms being formed with a camming structure having surface for engaging the motherboard to remove the memory card printed circuit board from the motherboard mounted connector receptacle; and proximal ends of the arms being formed with a tab-like portion shaped to engage the thumb or finger of a person manually operating the injector/ejector mechanism to spread the arms in opposite rotatory directions forcing the surface of the camming structure against the motherboard to vertically lift the printed circuit from then electrical connector receptacle mounted to a motherboard.

"In one embodiment, the length of the arm between the tab-like portion and the pivot point is longer than the length of the arm between the pivot point and the camming surface.

"In one embodiment, the pair of cams is mounted to a back side of the printed circuit board and a plurality of memory cards are mounted to, and project outwardly from, a front surface of the printed circuit board.

"In one embodiment, a coil spring is affixed at one end to the camming surface structure and having an outer end inserted into a slot formed in the edge of the printed circuit boards for urging the arms of away from one another to enable manual insertion of the printed circuit board into the motherboard mounted connector receptacle.

"In one embodiment, a horizontally extending bar is affixed at its end to the back side of printed circuit board, the intermediate portion of the bar being spaced from the back side of the memory card, the upper portion of the bar having at least one projection a vertical surface to provide an aid in indicating when the printed circuit board is fully inserted into the connector receptacle.

"In one embodiment, at least one of the arms has a position indicia positioned to be hidden by the vertical surface of the projection on the bar when the printed circuit board is fully engaged in the motherboard mounted connector receptacle

"In one embodiment, a connector receptacle disposed on the motherboard has a column of signal pins separated by a column of ground pins. The signal pins in one of the columns have a first signal pin disposed between a second signal pin and a third signal pin. The motherboard routes the signal pins to the CPU through conductors connected to the signal pins. Portions of the conductors connected to the second signal pin and to the third pin are deposed adjacent one another on one side of the column of ground pins and the conductor connected to the first pin is on the other side of the column of ground pins.

"In one embodiment, the connector receptacle disposed on the motherboard has a column having a pair strobe pins; the column of the pair of strobe pins being separated from the column of signal pins by a second column of ground pins; wherein the motherboard routes the pair of strobe pins to the CPU through strobe pin conductors connected to the strobe pins, the pair of strobe pin conductors being disposed on the same side of the second column of ground pins.

"The details of one or more embodiments of the disclosure are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the disclosure will be apparent from the description and drawings, and from the claims."

For more information, see this patent: Feroli, Lawrence J.; Sullivan, Kenneth M.; Beinor, Jr., Albert F.. Printed Circuit Board Injector/Ejector Mechanism. U.S. Patent Number 8747132, filed June 28, 2012, and published online on June 10, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8747132.PN.&OS=PN/8747132RS=PN/8747132

Keywords for this news article include: Electronics, Circuit Board, EMC Corporation.

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Source: Electronics Newsweekly


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