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Method for holding and releasing stacked heat spreaders in tubes to eliminate surface scratching during dispensing

IP.com Disclosure Number: IPCOM000010020D
Publication Date: 2002-Oct-09
Document File: 5 page(s) / 75K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for holding and releasing stacked heat spreaders in tubes to eliminate surface scratching during dispensing. Benefits include improved reliability, improved ease of manufacturing, and improved ease of implementation.

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Method for holding and releasing stacked heat spreaders in tubes to eliminate surface scratching during dispensing

Disclosed is a method for holding and releasing stacked heat spreaders in tubes to eliminate surface scratching during dispensing. Benefits include improved reliability, improved ease of manufacturing, and improved ease of implementation.

Background

        � � � � � Top surface scratches occur on heat spreaders when the spreader is slid off the bottom of the tube stack (see Figure 1). These scratches are generated by the weight of the entire stack of heat spreaders resting on the top of the bottom spreader as it is slid out from the bottom of the stack.

        � � � � � One conventional solution is coin stack presentation (see Figure 2). Parts are presented and removed from the top of the stack and indexed upward from the bottom. This� eliminates the applied pressure of the stacked units resting on an individual unit being slid or removed from the stack.

General description

        � � � � � The disclosed method is a simple mechanism that applies pressure to the side of the shipping tube, which in turn applies pressure to the edges of the stacked heat spreaders within the tube. This applied pressure supports the stack of heat spreaders on demand reducing the overall weight that is transferred from the spreader stack to the bottom spreader after it is dropped into a précising pocket and slid out from under the stack prior to being presented for placement.

        � � � � � The key elements of the method include:

•        � � � � Pincher mechanism that applies a line of direct pressure to the side of the shipping tube

•        � � � � Manifold and valve system to supply air pressure to the pincher actuator

•        � � � � Sensor feedback system that signals the valve system and pincher to apply pressure or release pressure as required to hold or release heat spreaders

Advantages

        � � � � � The disclosed method provides advantages, including:

•        � � � � Improved reliability due to defect prevention by supporting the spreader stack weight during the presentation of the spreader by the slider plate

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