The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 2011
Filed:
Sep. 16, 2008
Chien-fu Tseng, Yunlin County, TW;
Feng-hsiang Lo, Hsinchu County, TW;
Jenn-hwan Tarng, Hsinchu, TW;
Chih-ming Lin, Taichung, TW;
Chien-Fu Tseng, Yunlin County, TW;
Feng-Hsiang Lo, Hsinchu County, TW;
Jenn-Hwan Tarng, Hsinchu, TW;
Chih-Ming Lin, Taichung, TW;
Industrial Technology Research Institute, Hsinchu, TW;
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.