Lens compatible with various optical disks

Abstract

The invention relates to a lens compatible with various optical disks. The lens compatible with various optical disks comprises a first lens surface (1) and a second lens surface (2), wherein the first lens surface comprises a central area (11), an intermediate area (12) and an outer shaft area (13); the intermediate area (12) is different from and adjacent to the central area (12) and the outer shaft area (13); and the second lens surface (2) comprises an inner-layer area (21) and an outer-layer area (22) which are different from and adjacent to each other. According to the lens compatible with various optical disks, different areas of the two lens surfaces can generate different optical refraction effects and optical diffraction effects; and the incident laser can be focused at different positions in focusing areas after passing through different areas of the two lens surfaces, so as to form focusing points; and the corresponding focusing points serve as the information areas of different optical discs, so that different optical disks can be distinguished, read and written. 本发明涉及一种可以兼容多种类型光盘的透镜，包括第一透镜面(1)和第二透镜面(2)。第一透镜面包括中央区(11)、中间区(12)和外轴区(13)，该中间区(12)区别并相邻中央区(12)和外轴区(13)，第二透镜面(2)包括内层区(21)和外层区(22)，内层区(21)和外层区(22)区别并相邻。两个透镜面的不同区域具有不同的光学折射、衍射效应，入射激光经过两个透镜面的不同区域后，会在聚焦区的不同位置聚焦，形成聚焦点。对应的聚焦点为不同类型的光盘的信息区，从而实现不同类型光盘的识别、读取和写入。