Patent ID: 7957045

Claim:
A hologram media reading apparatus adapted to read hologram data on a hologram medium, the hologram media reading apparatus comprising: a reference light source, disposed on a side of the hologram medium, capable of emitting a reference light beam, wherein the reference light beam is transmitted to the hologram medium; a stop with gray level aperture, disposed on the side or another side of the hologram medium, and the stop with gray level aperture comprising: a transmissive region; an opaque region, surrounding the transmissive region; a transmittance gradually varying region, surrounding the transmissive region, wherein an inner edge of the transmittance gradually varying region is adjacent to the light transmissive region, and an outer edge of the transmittance gradually varying region is adjacent to the opaque region, light transmittance of the transmittance gradually varying region decreases from the inner edge to the outer edge gradually, and a part of the reference light beam from the hologram medium passes through the stop with gray level aperture; and an optical sensor, disposed on an optical path of the reference light beam passing through the stop with gray level aperture.