| 摘要 |
本发明所揭示之器件系一种列印装置，其包含：一记录薄片输送区块，其固持一记录薄片且包含一发光元件及一第一光接收元件；一头区块，其将字元、图形或诸如此类列印于该记录薄片上，包含经定位以面向该发光元件以便直接接收光之一第二光接收元件；及一控制电路，其连接至该发光元件、该第一光接收元件及该第二光接收元件，其中该控制电路判定：当该光系由该第二光接收元件侦测时，该记录薄片不存在于该发光元件与该第二光接收元件之间，且当该光并非由该第二光接收元件侦测而系由该第一光接收元件侦测时，该记录薄片存在。; a head block printing characters, graphics or the like on the recording sheet including a second light receiving element positioned to face the light emitting element so as to directly receive the light; and a control circuit connected to the light emitting element, the first light receiving element, and the second light receiving element, wherein the control circuit determines, when the light is detected by the second light receiving element, that the recording sheet does not exist between the light emitting element and the second light receiving element, and when the light is not detected by the second light receiving element and is detected by the first light receiving element, that the recording sheet exists. |
