Patent ID: 7719947
Filing Date: 2010-05-18
Classification: G03H,G11B

Abstract:
1. A reading device for holographic storage, comprising: a light source for providing a light beam; a light-directing component, disposed on a transmission path of the light beam emitted from the light source, wherein the light-directing component enables the light beam to get incidence at a holographic storage medium in a reading angle to generate a data beam; an optical sensor, located on a transmission path of the data beam for reading the data beam and reproducing a stored data; and a prism, disposed between the light source and the holographic storage medium for fine-adjusting the reading angle, wherein the prism has a light incident surface and a tight emerging surface, the light beam enters the prism from the light incident surface and emits out of the prism from the light emerging surface, the prism is rotatable about a rotation axis perpendicular to the transmission path of the light beam, the prism and the light beam satisfy the following formula: wherein I