Image sensor unit and method for manufacturing image sensor unit

An image sensor unit manufacturing method, the unit including:

• a light guide that is column shaped and configured to emit a light from a side surface thereof toward a subject to be read, the light emitted to an end surface of the light guide;
• a light source positioned facing the end surface of the light guide, and configured to emit light toward the end surface of the light guide;
• a lens configured to cause the light reflected by the subject to be read to converge in a width direction of the light guide, the light emitted from the side surface of the light guide;
• a frame that is frame shaped and configured to house the light guide and the lens;
• a cover configured to cover at least a part of one opening of the frame and not to restrict light from passing through between the light guide and the subject to be read;
• a line sensor configured to receive light converged in a width direction of the light guide by the lens;
• and
• a sensor board onto which the line sensor is mounted along a lengthwise direction of the light guide, configured to cover the other opening of the frame,
• the method comprising:
• forming a first support that supports a first to-be-supported section on the side surface of the light guide, wherein the first to-be-supported section is provided on both end portions in the lengthwise direction of the light guide,
• forming a second support that supports a second to-be-supported section on the side surface of the light guide, wherein the second to-be-supported section is opposite to the first to-be-supported section and is provided on both end portions in the lengthwise direction of the light guide, and
• providing a flange portion composed of the first support provided on the frame and the second support provided on the cover between which the light guide is sandwiched, and fixing the light guide inside the frame.