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:
Jul. 19, 2011
Filed:
May. 15, 2009
Takafumi Endo, Chiyoda-ku, JP;
Yohei Nokami, Chiyoda-ku, JP;
Takafumi Endo, Chiyoda-ku, JP;
Yohei Nokami, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A compact image reading device is provided in which a plurality of illumination devices are not needed, and by which a hologram image can be accurately identified in a short period. The image reading device includes a first light source, arranged in a main-scanning direction on a face perpendicular to the conveying direction, for emitting light having a plurality of wavelengths, a second light source, arranged, in parallel to the first-light-source arrangement, on the same face on which the first light source is provided, or in the periphery thereof, for emitting light having a plurality of wavelengths, a light guide for guiding light from the first and second light sources in a sub-scanning direction, and the light guide, having total reflection faces whose illumination angles are different from each other, for irradiating a portion, of a hologram region, to be irradiated with light after totally reflected by the reflection faces, a lighting control means for controlling in a time division manner an exposure ratio between light quantities incident on the total reflection faces of the light guide, a lens assembly for focusing reflection light reflected by a reflective portion of a target positioned at the portion to be light-irradiated, and a sensor for receiving, for each divided time, light focused by the lens assembly, whereby the device is configured to enable detection of the hologram region in the target.