| 摘要 |
A compact specular reflection type image pickup unit has a light source 11 mounted at a position a specified distance away from the target surface of an original P, and the light source 11 emits an outgoing light ph 11 at an angle theta to the normal to the target surface. The emitted light ph 11 passes through a glass plate 12 and is incident on the focal points f of a rod lens array 13 on the target surface of the original P at an incidence angle theta, and is reflected at a reflection angle theta as a reflected light rf11. The reflected light rf11 is converged by the rod lens array 13, received by an image pickup element 14 and converted into electric signals. A board 14a is arranged such that the light-receiving faces of the image-pickup elements are parallel with the target object surface of the original P, and the board 14a is fixed to the bottom wall of a housing 15A. As a consequence, the height of the housing 15A is smaller by L1 than that of the housing 5.
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