首页>
外国专利>
Optical Pickup Unit and Optical Pickup Device Having Same and Information Writing/Reading Device Having Same
Optical Pickup Unit and Optical Pickup Device Having Same and Information Writing/Reading Device Having Same
展开▼
机译:光拾取单元和具有该光拾取单元的光拾取装置以及具有该光拾取装置的信息写入/读取装置
展开▼
页面导航
摘要
著录项
相似文献
摘要
An optical pickup device includes: a splitting section for splitting a beam; a light-receiving section for receiving the split beams. The light-receiving section includes: a tracking-use main light-receiving region and tracking-use sub light-receiving regions, and auxiliary light-receiving regions. Each of the auxiliary light-receiving regions receives only a light beam reflected off a recording layer other than a recording layer subjected to an information writing/reading process. A light-receiving area of each of the auxiliary light-receiving area is smaller than a light-receiving area of each tracking-use light-receiving region. Further, an optical pickup device includes: a splitting section for splitting a beam; and a light-receiving section for receiving the split beams. The light-receiving section includes a sub light-receiving regions for receiving tracking-use sub beams. The tracking-use sub beams are arranged so as not to allow entering of a focusing-use main beam reflected off a non-targeted recording layer.
展开▼