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Method for an actuated cam lock for PGA sockets

IP.com Disclosure Number: IPCOM000146462D
Publication Date: 2007-Feb-13
Document File: 5 page(s) / 197K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for an actuated cam lock for pin-grid array (PGA) sockets. Benefits include improved functionality, improved performance, improved reliability, and improved cost effectiveness.

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Method for an actuated cam lock for PGA sockets

Disclosed is a method for an actuated cam lock for pin-grid array (PGA) sockets. Benefits include improved functionality, improved performance, improved reliability, and improved cost effectiveness.

Background

      Future computer system platform designs are expected to have a higher pin count and smaller pitch. Increasing central processing unit (CPU) power requirements use more contacts to carry the current. Higher speed-differential data input/output (I/O) buses require more contacts. Increased CPU integration requires more socket contacts. Smaller computers require a reduced footprint area. Cost reduction is an on-going requirement. PGA sockets, which are used for mobile applications, are subject to these requirements and trends.

      To reduce the pitch for PGA sockets, a cantilever beam-style contact provides a smaller cross-section area and a lower actuation force. The trade-off is that this type of contact design requires constant force from the cam actuating structure, causing long-term reliability issues due to relaxation and creep of the actuation structure.

      Conventional PGA socket designs require a higher actuation and contact force, limiting the scaling of the pin count and pitch. Due to the larger cross section of this conventional contact design, scaling the pitch down is further limited (see Figure 1).

General description

      The disclosed method is an actuated cam lock for PGA sockets. The method uses a cantilever beam contact design to reduce the cross-sectional area of the contacts, providing additional space to reduce the pitch. The cam locking feature removes the requirement for loading on the cam actuation system by providing a lock or stop for the cam, transferring the constant load to the locking feature.

      The key elements of the disclosed method include:

•     Preventing the unloading of a PGA socket cam actuation structure with a cantilever beam

•     Locking device for the actuating cam for PGA sockets

      The disclosed method anchors the actuating mechanism for cantilever beam style contacts, preventing the cam from turning backwards and unloading the pins from the socket contacts. As a result, the risk of long-term degradation of the pin contact interface is reduced or eliminated (see Figure 2).

Advantages

      The disclosed method provides advantages, including:
•     Improved functionality due to providing a...