Patent ID: 7706234
Filing Date: 2010-04-27
Classification: G02B,G11B

Abstract:
1. An optical scanning device for scanning an optical record carrier in one of an optimized or non-optimized mode, said device having an information layer, comprising a radiation source for generating a radiation beam, a radiation detector whose dimensions are optimized to the dimensions of a radiation spot when operating in said optimized mode, an optical system having a forward optical path and a forward magnification comprising an objective lens for focusing said radiation beam onto the information layer, and a return optical path having a return magnification for transmitting the radiation beam reflected by the information layer to the radiation detector, means for varying or adjusting the return magnification without substantially affecting the forward magnification, wherein said means operates in one of said optimized or non-optimized mode, and wherein said means reduces the return optical path magnification only in said non-optimized mode.