| 摘要 |
An optical receiving device ( 31 ) for an optical code reader is described, comprising a solid body, of a transparent material, having a light input face ( 32 ), a light output face ( 33 ) for coupling with a photodetector device ( 30 ), said output face ( 33 ) being substantially perpendicular to said input face ( 32 ), and an oblique face ( 34 ) with respect to both said input face ( 32 ) and said output face ( 34 ), characterized in that the mutual orientation of the faces ( 32 - 38, 40 - 42, 40', 41', 42' ) of the optical receiving device ( 31 ) is such that the light entering from said input face ( 32 ) within a desired field of view is concentrated onto said output face ( 33 ) by total internal reflection.
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