Abstract: An optical system affixed to an electronic apparatus is provided, including a first optical module, a second optical module, and a third optical module. The first optical module is configured to adjust the moving direction of a first light from a first moving direction to a second moving direction, wherein the first moving direction is not parallel to the second moving direction. The second optical module is configured to receive the first light moving in the second moving direction. The first light reaches the third optical module via the first optical module and the second optical module in sequence. The third optical module includes a first photoelectric converter configured to transform the first light into a first image signal.

Abstract: An optical system affixed to an electronic apparatus is provided, including a first optical module, a second optical module, and a third optical module. The first optical module is configured to adjust the moving direction of a first light from a first moving direction to a second moving direction, wherein the first moving direction is not parallel to the second moving direction. The second optical module is configured to receive the first light moving in the second moving direction. The first light reaches the third optical module via the first optical module and the second optical module in sequence. The third optical module includes a first photoelectric converter configured to transform the first light into a first image signal.

Abstract: A range hood vapor cleaning apparatus has a vapor cleaning module, a control module, an input module and a fan driver module. The control module is electrically connected to the vapor cleaning module, the input module and the fan driver module. The control module is controlled by the input module and executes a vapor cleaning mode. When the control module executes the vapor cleaning mode, the control module controls the vapor cleaning module to generate vapor and meanwhile activates the fan driver module to drive a fan motor to blow the vapor to a fan housing and an exhaust fan and to exhaust the vapor out of the fan housing.

Abstract: A range hood of vapor-cleaning type has a chamber module and a vapor-cleaning module. The vapor-cleaning module has a tank, a pump, and a heater. The pump is connected with the tank and the heater. The tank is filled with water, and the water in the tank is pumped to the heater to be heated into vapor by the heater. The vapor is pumped in the chamber module to melt grease adhering in the chamber module. A temperature of the vapor is high, such that grease adhering in the chamber module is melted easily.

Abstract: A DC motor speed controller of a range hood has a motor driving circuit, a DC brushless motor and a monitoring module. The motor driving circuit has a PWM controller and a phase control circuit electrically connected with the pulse width modulation controller. The DC brushless motor is electrically connected to the motor driving circuit. The monitoring module has a microprocessor that generates and transmits a speed control signal to the motor driving circuit so that the motor driving circuit generates a PWM signal to the phase control circuit, the phase control circuit performs a phase modulation and outputs a speed control voltage to the DC brushless motor, and the DC brushless motor varies a speed thereof according to the speed control voltage. Accordingly, the DC motor speed controller of the present invention can drive the DC motor of a range hold with at least four different speeds.