Patent ID: 7445327

Claim:
A flat plate-shaped platen used for an inkjet recording apparatus that includes a side-end detection unit that moves a light emitting element, which faces a recording medium being conveyed in a conveyance direction, and a light receiving element in a direction intersecting with the conveyance direction while causing the light emitting element to emit light toward the recording medium, the side-end detection unit detecting a side end of the recording medium on a basis of an amount of light received by the light receiving element, and a recording head that ejects ink selectively to form an image on the recording medium, the platen comprising: a blocking wall that prevents the ink ejected from the recording head from entering an area which faces a movement area where the side-end detection unit moves, the blocking wall extending in a direction intersecting with the conveyance direction and having an inclined surface that prevents the light emitted from the light emitting element from being reflected toward the light receiving element, the inclined surface being disposed upstream of the blocking wall in the conveyance direction.