Reading device
AssigneeNational Chiao Tung University
InventorsChing-Cherng Sun, Yeh-Wei Yu
Life of this patent
Estimating the term…
Abstract
A reading device includes a spatial light modulator, a zoom lens set, an object lens, an image sensor, and an adjusting module. The spatial light modulator provides a reading beam. The zoom lens set forms the reading beam into a real image. The object lens focuses the real image onto a collinear holographic storage medium and thus produces a diffraction signal. The image sensor converts the diffraction signal into an electric signal. The adjusting module adjusts the optical magnification of the zoom lens set according to the quality of the diffraction signal.
Claims12
A reading device comprising:
- a spatial light modulator (SLM) for providing a reading beam;
- a zoom lens set for forming the reading beam into a real image;
- an object lens for focusing the real image onto a collinear holographic storage medium and thus producing a diffraction signal;
- an image sensor for converting the diffraction signal into an electric signal;
- and
- an adjusting module for adjusting the optical magnification of the zoom lens set according to the quality of the diffraction signal.
A reading device comprising:
- a spatial light modulator (SLM) for providing a reading beam;
- a zoom lens set for forming the reading beam into a real image;
- an object lens for focusing the real image onto a collinear holographic storage medium;
- a temperature sensor for measuring the temperature of the collinear holographic storage medium;
- and
- a controller for selecting the optical magnification of the zoom lens set according to the temperature of the collinear holographic storage medium.
A reading device comprising:
- a radial phase modulator for modulating a reading beam, such that the modulated reading beam has a constant phase along each radial axis of the reading beam;
- an object lens for focusing the modulated reading beam onto a collinear holographic storage medium and thus producing a diffraction signal;
- an image sensor for converting the diffraction signal into an electric signal.
Dependencies are inferred from the claim text.