Patent ID: 6701203
Filing Date: 2004-03-02
Classification: G05B,G06Q

Abstract:
The method of calculating a capacity component in a multi-chamber tool, said tool comprising a plurality of process chambers in an up or down state, the method comprising the steps of:(a) querying a database to retrieve the total amount of time each chamber is in an up or down state and individual components contributing to capacity loss during a predetermined time period; (b) calculating the full tool equivalent capacity loss component by using the formula T&it;â€ƒ&it;i&it;â€ƒ&it;m&it;â€ƒ&it;e&af;(N)+[(N-1)/N]*Time(N-1)&it;â€ƒ&it;â€¦[(N-(N-1))/N]*T&it;â€ƒ&it;i&it;â€ƒ&it;m&it;â€ƒ&it;e&af;(1)T&it;â€ƒ&it;o&it;â€ƒ&it;t&it;â€ƒ&it;a&it;â€ƒ&it;l&it;â€ƒ&it;T&it;â€ƒ&it;i&it;â€ƒ&it;m&it;â€ƒ&it;ewhere N is the number of chambers in the multi-chamber tool and the Time function represents the time the proscribed number of chambers in are in an up or down state for that capacity component, whereby the full tool equivalent is obtained;(c) calculating the production capacity loss component; (d) calculating tool unavailable and idle-no-operator capacity components, and (e) determining the idle-no-WIP in progress capacity component through the equation: idle-no-WIP=1âˆ’tool unavailableâˆ’productionâˆ’idle-no-operator.