Patent ID: 6867921
Filing Date: 2005-03-15
Classification: G02B

Abstract:
1. A method of making a focus-position compensator for a microlens array having a substrate, the method comprising the steps of: determining the spatial variation of focus distance of the microlens array; choosing a number of tiles, a spatial distribution of tiles, and a tile focus-position correction Δ selecting a tile thickness t choosing a reference thickness t determining a spacer-block thickness si corresponding to the i-th tile such that s constructing tiles, the i-th tile having thickness t constructing spacer blocks for all s micromachining a tile tray, the tile tray having a receptacle for receiving each tile, the i-th receptacle being positioned to receive the i-th tile; for s placing the i-th tile in the i-th receptacle, wherein for s placing an intervening structure on top of the tiles; bonding the tiles to the intervening structure; removing the tile tray and the spacer blocks.