Patent ID: 7842201

Claim:
A method for manufacturing a micro-retarder, comprising: providing an optically anisotropic polymolecule film; providing a heating source; providing a conical lens and a focusing lens for deflecting an energy formed by the heating source, the energy to be applied to the polymolecule film, so that the energy formed in the central area of the heating source is smaller than that in the peripheral area of the heating source, wherein the energy changes to a valley distribution curve from a Gaussian distribution curve through the conical lens and changes to an inverse Gaussian distribution curve from the valley distribution curve through the focusing lens, so that the energy formed in the central area of the laser beam is smaller than that in the peripheral area; and relatively moving the polymolecule film and the heating source along a first direction, so that the heating source heats at least one partial area of the polymolecule film along the first direction and resumes the partial area of the polymolecule film to be optically isotropic.