Hologram media reading apparatus

Details Hologram media reading apparatus Hologram media reading apparatus

2011-06-07

2011-06-07

Amari, Alessandro (Department: 2872)

Optical: systems and elements

Holographic system or element

For producing or reconstructing images from multiple holograms

C359S029000, C359S032000, C369S103000

Reexamination Certificate

active

07957045

ABSTRACT:
A hologram media reading apparatus including a reference light source, a stop with gray level aperture, and an optical sensor is provided. The reference light source is disposed on one side of a hologram medium, and capable of emitting a reference light beam. The reference light beam is transmitted to the hologram medium. The stop with gray level aperture and the reference light source are disposed on the same side or opposite sides of the hologram medium. The stop with gray level aperture has a light transmissive region, an opaque region, and a transmittance gradually varying region. The opaque region surrounds the light transmissive region. The transmittance gradually varying region surrounds the light transmissive region. A part of the reference beam from the hologram medium passes through the stop with gray level aperture and is transmitted to the optical sensor.

REFERENCES:
patent: 7092133 (2006-08-01), Anderson et al.
patent: 7167286 (2007-01-01), Anderson et al.
patent: 2005/0260508 (2005-11-01), Lizotte
patent: 2009/0262406 (2009-10-01), Hara

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