Optical image reader

Details Optical image reader Optical image reader

2007-03-20

2007-03-20

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C359S034000, C382S124000

Reexamination Certificate

active

10947456

ABSTRACT:
An optical image reader includes a transparent light guide plate having an object placement surface, an illumination light source for emitting light to an end face of the plate, a holographic diffraction grating element disposed at a surface of the plate opposite to the object placement surface via a low refraction index layer, a sensor unit disposed near an end face of the diffraction grating element via a light-condensing optical system, and a control circuit connected to the diffraction grating element and sensor unit. The control circuit performs controlling so that linear areas to which an electrical field is applied are successively selected in the extension direction of the object placement surface, successively receives electrical signals output in linear area units from the sensor unit, converts them into pieces of linear image information, and joins these pieces of linear image information to produce a two-dimensional image.

REFERENCES:
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patent: 6061463 (2000-05-01), Metz et al.
patent: 2006/0039049 (2006-02-01), Carver et al.
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patent: WO 96/11450 (1996-04-01), None
patent: WO 98/04650 (1998-02-01), None
patent: WO 03/010607 (2003-02-01), None
European Search Report dated Nov. 8, 2005 from corresponding European Application No. 04 256 283.5.

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