Image sensor substrate and image sensor employing it

An image sensor comprising:

• a casing;
• a light source disposed in the casing for emitting light toward an object to be read;
• an image sensor substrate having on an obverse surface provided with a plurality of light receiving elements for generating image signals upon receiving light reflected by the object, the image sensor substrate being disposed so that the obverse surface thereof is directed inwardly of the casing;
• wherein the substrate is covered with a light shielding layer for covering a reverse surface of the substrate where the plurality of light receiving elements are mounted, the light shielding layer being no greater in area than the reverse surface of the substrate.

An image sensor comprising:

• a casing;
• a light source disposed in the casing for emitting light toward an object to be read;
• an image sensor substrate having on an obverse surface provided with a plurality of light receiving elements for generating image signals upon receiving light reflected by the object, the image sensor substrate being disposed so that the obverse surface thereof is directed inwardly of the casing;
• and
• a light shielding layer for covering a reverse surface of the substrate;
• wherein the light shielding layer comprises a light-shielding tape bonded to the reverse surface of the substrate.