一、前言厚度为1.2mm、直径为120mm的激光视盘CD (compact Disc)作为画面、声音等多媒体信息的传递手段业已普及,成为一种常用的信息介质。但是作为多媒体存储介质,其容量并不尽如人意。在此背景下,第二代光盘DVD(Digital Video Disc)便应运而生了。DVD光盘不仅仅是在容量方面取代CD,同时还拓宽了利用多媒体信息的视野。本文将介绍在DVD光盘系统的光学头中所应用的高频叠加(HFCS:High Frequency Current Superposition)技术。 I. INTRODUCTION CDs (compact discs) with a thickness of 1.2 mm and a diameter of 120 mm have become widespread as a means of transmitting multimedia information such as pictures and sounds and have become a commonly used information medium. However, as a multimedia storage medium, its capacity is not satisfactory. In this context, the second generation of DVD (Digital Video Disc) came into being. DVD discs not only replace the CD in terms of capacity, but also broaden the horizons of the use of multimedia information. This article describes the HFCS (High Frequency Current Superposition) technique used in the optical head of a DVD optical disk system.