Patent attributes
A portable optical reader is provided with LED light sources 2911 to 2914; a diffusion plate 23 diffusing the light emitted from the LED light sources 2911 to 2914; an opening 2431 formed on the diffusion plate 23 transmitting diffusion reflecting light; an imaging part 41 receiving the diffusion reflecting light through the opening 2431; a LED light source 2915 emitting the light to the symbol; a light projection polarizing element 242 polarizing the light emitted from the LED light source 2915; an opening 2432 formed in the diffusion plate 23 transmitting the polarized light emitted from the LED light source 2915; and a light reception polarizing element 241 polarizing the diffusion reflecting light which is the polarized light emitted from the LED light source 2915 and reflected on the symbol and transmitted through the opening 2431.
