Image sensor unit and image reader

An image sensor unit comprising:

• a plurality of light sources;
• a sensor substrate with a plurality of photoelectric conversion elements mounted thereon;
• a rod-like light guide with the light sources arranged close to respective opposite ends thereof in a longitudinal direction to guide light from the light sources to illuminate an illumination target;
• an image forming element configured to form light reflected from the illumination target into an image on the sensor substrate;
• a support with each of the light sources, the sensor substrate, the light guide, and the image forming element attached thereto;
• and
• a locking element configured to allow a substantially central portion of the light guide and the support to be locked together, and light blocking members configured to cover the respective opposite ends of the light guide.

An image reader using an image sensor unit comprising:

• a plurality of light sources;
• a sensor substrate with a plurality of photoelectric conversion elements mounted thereon;
• a rod-like light guide with the light sources arranged close to respective opposite ends thereof in a longitudinal direction to guide light from the light sources to illuminate an illumination target;
• an image forming element configured to form light reflected from the illumination target into an image on the sensor substrate;
• a support with each of the light sources, the sensor substrate, the light guide, and the image forming element attached thereto;
• and
• a locking element configured to allow one end of the light guide and the support to be locked together and a light blocking member configured to cover another end of the light guide, or a locking element configured to allow a substantially central portion of the light guide and the support to be locked together and light blocking members configured to cover the respective opposite ends of the light guide.