Pendulum Substrate Scanning With Dual Rotation for Compact Chambers
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Solution Overview
Problem
Conventional substrate scanning apparatuses are bulky, leading to large vacuum chambers that are expensive, require complex automation, and struggle to achieve the necessary accuracy for sensitive location-specific processes due to their size and footprint.
Innovation Solution
A substrate scanning system utilizing a pendulum arm with a rotatable substrate holder, where a first rotary drive at the proximal end and a second rotary drive at the distal end synchronize to move the substrate in a parallel raster pattern, allowing for precise control and reduced chamber size through arc motions and substrate rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional scanning mechanisms are used, then substrate scanning capability is achieved, but the apparatus becomes bulky with large footprint requiring expensive vacuum chambers
Solution Approach 1:
The substrate holder is divided into two independent rotational systems: a first rotary drive for azimuthal rotation and a second rotary drive for elevation rotation. This segmentation allows each axis to be controlled independently, achieving complex scanning patterns while maintaining a compact overall structure that reduces vacuum chamber size.
Solution Approach 2:
The patent transitions from conventional two-dimensional linear scanning to three-dimensional spherical coordinate scanning by adding elevation rotation capability. This dimensional change enables precise substrate positioning through angular movements rather than linear translations, significantly reducing the mechanical footprint while maintaining or improving positioning accuracy.
2Adaptability or versatility
If conventional scanning mechanisms are used, then substrate scanning is possible, but device complexity and cost increase due to larger vacuum chambers
Solution Approach 1:
The dual rotary drive system with spherical coordinate capability provides universal scanning functionality that can achieve multiple scanning patterns (linear, circular, spiral, random) through different coordinate transformations. This multi-functionality eliminates the need for multiple specialized scanning mechanisms, reducing overall device complexity while maintaining high adaptability.
Solution Approach 2:
The system achieves scanning pattern flexibility by changing rotational parameters (azimuthal angle, elevation angle, rotation speeds) rather than changing mechanical configurations. This parametric control allows dynamic adaptation to different scanning requirements without increasing physical device complexity or vacuum chamber size.
Data Source
AI summary
A method of scanning a substrate includes performing a pass of a parallel raster pattern by synchronously driving a first rotary drive and a second rotary drive to move a substrate within a processing chamber relative to a processing apparatus focused on a localized spot on the substrate, the first rotary drive being coupled to a proximal end of a pendulum arm and the second rotary drive being mounted at a distal end of the pendulum arm and to the substrate. Driving the first rotary drive during the pass includes moving the pendulum arm in a first arc motion for a first portion of the pass while the localized spot is on the substrate, and then moving the pendulum arm in an opposite second arc motion for a second portion of the pass while the localized spot is on the substrate.