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Optical reader module and optical reader

An optical reading module and optical technology, applied in the field of optical readers, can solve the problems of unavoidable simplification of identification for visual inspection of multiple image information

Inactive Publication Date: 2012-08-22
SONY CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The image-switching hologram disclosed in Japanese Unexamined Patent Application Publication No. 2008-122670 cannot fully meet the need for simplified authentication due to the unavoidable visual inspection of recorded pieces of image information

Method used

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  • Optical reader module and optical reader
  • Optical reader module and optical reader
  • Optical reader module and optical reader

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0031] 0. Barcode readers and holograms containing two-dimensional information

no. 3 approach

[0035] 4. Variations

[0036] It should be noted that the embodiments described below are preferred examples of the optical reading module and the optical reader. Although the following description contains various technically preferable limitations, the embodiments of the optical reading module and the optical reader are not limited to the following embodiments unless specifically stated otherwise.

[0037] 0. Barcode readers and holograms containing two-dimensional information

[0038] In order to facilitate understanding of the embodiment, before a description of the embodiment is given, a configuration of a typical barcode reader and an overview of a hologram in which two-dimensional information is recorded will be described.

[0039] Figure 8A is a perspective view of an exemplary barcode reader that optically reads a two-dimensional barcode, Figure 8B is viewed from the side Figure 8A Schematic diagram of the barcode reader in . Figure 8B The image forming optic...

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PUM

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Abstract

The present invention discloses an optical reader module and an optical reader. The optical reader module includes a first illumination light source that emits reproducing illumination light to an image-capture target containing a hologram in which information reproduced in a predetermined angle area when illuminated from a predetermined angle is recorded, thereby reproducing the information recorded in the hologram; an image-capturing device that captures an image of the information reproduced from the hologram; and a first light-projecting unit that projects first-optical-guide-forming light on the image-capture target. A first optical guide projected on the image-capture target takes a predetermined shape when the emission angle of the reproducing illumination light to the hologram is equal to the predetermined angle. An observer of the image-capture target recognizes misalignment between the emission angle of the reproducing illumination light to the hologram and the predetermined angle, based on distortion of the first optical guide projected on the image-capture target from the predetermined shape.

Description

technical field [0001] The present invention relates to an optical reading module and an optical reader. More particularly, it relates to an optical reading module and an optical reader for holograms containing image information represented two-dimensionally, such as characters and barcodes. Background technique [0002] Holograms capable of displaying three-dimensional images are used to authenticate credit cards, ID cards, and the like. In recent years, a volume hologram in which an interference pattern is recorded as a difference in refractive index of a recording layer has been frequently used. This is because a high-level technique must be used to generate a recorded image to forge a volume hologram, and it is difficult to obtain a recording material. [0003] However, the technology for replicating volume holograms is increasingly advanced, requiring holograms to have better authentication functions and anti-counterfeiting features. In order to impart a better ident...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/10
CPCG03H1/2205G03H2001/2244G03H2210/53G06K7/10732G06K19/06065
Inventor 白仓明
Owner SONY CORP
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