Abstract: Based on the theory of computer generated hologram and fabrication of binary optical element, a new micro-optic element for optical disk memory read-write heads is proposed. This element is small in size (5mm in diameter, 1mm in thickness), light in weight ($LS@0.03g), and high in diffraction efficiency (36.64%). It is with three optical functions required for an optical head, splitting beam, producing the focusing error signal and the tracking error signal. When this micro-optic element is used to replace four conventional optical elements (a diffraction grating, a beam splitter prism, a collimating lens and a cylindrical lens) of common optical head, a sophisticated optical head can be produced. !4
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