| 摘要 |
An image forming apparatus includes a sheet tray configured to accommodate stacked sheets and a sheet feeding device configured to feed the stacked sheets in the sheet tray. A light emitting device emits light toward the stacked sheets, and the emitted light includes at least two values of light. A light receiving device receives the light emitted by the light emitting device. Further, a control device detects the number of paper sheets in the stack based on a quantity of a decrease of the transmitted light emitted by the light emitting device. An image forming device is configured to form images on the sheets.
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