Abstract: A dual-mode tablet and a detecting and switching method for input signals thereof are provided. The dual-mode tablet includes an electromagnetic induction module and a touch input module. The microprocessor controls the electromagnetic induction module to electronically connect to an induction coil group and detects whether any electromagnetic signal is received. After the electromagnetic induction module receives one electromagnetic signal completely, the microprocessor controls the touch input module to electronically connect to the induction coil group. When the microprocessor receives a touch input signal, the microprocessor alternately controls one of the electromagnetic induction module and the touch input module to electronically connect to the induction coil group. When the microprocessor detects one electromagnetic signal is received, the electromagnetic induction module electronically connects to the induction coil group continuously until the electromagnetic signal is received completely.

Abstract: An optical input device is applied in an electronic device. The optical input device includes a light source generator and a photosensitive plate. The light source generator has a body and a light source disposed within the body. The photosensitive plate is electrically connected to the electronic device, or is electrically disposed within the electronic device, and is electrically connected to a microprocessor. The light source of the light source generator emits a light ray through the body to form a light pattern image on the photosensitive plate. The photosensitive plate detects a deformation of the light pattern image, and outputs a control signal to the microprocessor correspondingly according to a shape of the light pattern image, enabling the electronic device to execute a corresponding preset function.