Omnidirectionally adjustable handheld fan

An omnidirectionally adjustable handheld fan, comprising:

• a fan main body comprising an air outlet assembly;
• a handle connected to the fan main body, the handle comprising a trackball, a detection device, and a control mainboard;
• wherein the detection device is electrically connected to the control mainboard, the detection device is configured to detect a rotation direction of the trackball, and the control mainboard is configured to adjust an airflow rate of the air outlet assembly based on the rotation direction of the trackball;
• wherein the air outlet assembly comprises a motor, a rotating shaft connected to the motor, and a fan blade connected to the rotating shaft;
• the control mainboard is configured to adjust a rotational speed of the motor and the fan blade based on the rotation direction of the trackball;
• wherein the detection device comprises an image sensor configured to emit light toward the trackball, and receive light reflected from the trackball in response to rotation of the trackball;
• wherein the detection device further comprises a light guide component disposed between the image sensor and the trackball;
• the light guide component is configured to guide and concentrate the light emitted from the image sensor to form a light pattern onto the trackball, and guide and concentrate the reflected light from the trackball to the image sensor.