| 摘要 |
<p>PROBLEM TO BE SOLVED: To enhance the speed of detection response in a sheet detection by use of a light emitting element and a light receiving element. SOLUTION: This detector comprises the light emitting element 130, the light receiving element 140 for receiving the light emitted from the light emitting element 130, a CPU for detecting the absence of a sheet on the optical path between the light emitting element and the light receiving element according to the receipt of the light by the light receiving element, and an auxiliary light emitting element 190 provided in the vicinity of the light receiving element 140.</p> |
