Material or article handling – Device for emptying portable receptacle – With jarring means
Patent
1992-09-02
1994-07-19
Werner, Frank E.
Material or article handling
Device for emptying portable receptacle
With jarring means
414608, 414222, 414403, 414937, 414940, 414749, 118500, 1983461, 1983391, 1983463, B65G 6500
Patent
active
053303016
DESCRIPTION:
BRIEF SUMMARY
This invention relates to batch loading mechanisms and in particular, but not exclusively, to loading mechanisms for use with semi-conductor processing apparatus.
Currently semi-conductor wafers are processed either as single wafers or in batches. Batches can be loaded one at a time, or as a batch on a pallet. Loading a batch one at a time is time consuming and subjects the individual wafers in the batch to varying conditions. Those loaded earliest will have spent longer in the chamber than those loaded last. This will adversely affect the process uniformity across the batch. In extreme cases the first loaded wafers will be spoilt by the wait for the last to load, or the last to load will not be processed properly because they have not achieved the same state as those that have been loaded earlier. This is particularly the case where the process involves heating. In many processes the heat required to achieve a good process is sufficiently high as to cause undesirable side effects and damage if continued for too long. It is therefore important to achieve such a temperature but to minimise the length of time the wafers are at such temperatures. If the batch loading time is significant then either the first to load will have been subjected to excessive time-at-temperature or the last to load have had insufficient time to reach the correct temperature.
The present invention consists in a workpiece loading mechanism, comprising a work station having a plurality of lifting elements arranged in lines and means for moving the elements between the workpiece lift position and a rest position; a pallet for supporting workpieces and means for moving the pallet into and out of the work station, the pallet having a plurality of slots corresponding to the lines of the elements such that the elements can pass through the slots when the pallet is at the work station, to lift the workpieces off the pallet and such that the pallet can be withdrawn from the work station with the elements in the workpiece lift position.
Preferably the lines are substantially straight and substantially parallel. In some instances single elements may consitute a line for these purposes but at least some of the lines will include a plurality of elements. The elements may be in the form of pins. Conveniently the elements are mounted on a common base for simultaneous movement for example by means of a hydraulic ram.
The invention also consists in a gas reactor having a work station including a vacuum chamber and a mechanism as defined above for loading workpieces through a side wall thereon.
The workpieces may be semi-conductor wafers.
Although the invention has been defined above it is to be understood that it includes any inventive combination of the features set out above or in the following description.
The invention may be performed in various ways and specific embodiments will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a plan view of a dual chamber processing apparatus with one form of loading mechanism, and
FIG. 2 is a cross-sectional view of a single chamber apparatus with a different form of loading mechanism.
Referring first to FIG. 1 a processing apparatus 10 has chambers 11 and 12 and a loading mechanism generally indicated at 13. The loading mechanism 13 includes a carrier 14 and an actuating mechanism 15 which can move the carrier 14 in a straight line into or out of the chambers 11 and 12 using a "frog legs" mechanism. One example is manufactured by Brooks Automation.
As will be seen a pallet 16 can be placed into the carrier 14. The pallet 16 which has a number of recessed semi-conductor wafer locations 17 and eight slots 18 of different lengths, extending into, and in some cases through, the locations 17 from the leading edge of the pallet 16.
As can best be seen in FIG. 2 a work station 19, in chamber 12, has a base 20 on which is positioned an array 21 of pins 22 which are, when viewed in one direction, aligned in a series of parallel lines which are indicated at A-H. A
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Surface Technology Systems Limited
Werner Frank E.
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