Eye tracking device and virtual reality imaging apparatus

An eye tracking device comprising:

• an electromagnetic radiation source configured to emit electromagnetic radiation toward an eye;
• a lens having a first side surface facing the eye and a second side surface opposite the first side surface;
• a first reflective film on the first side surface of the lens for reflecting the electromagnetic radiation;
• a second reflective film on the second side surface of the lens for reflecting the electromagnetic radiation;
• and
• an imaging apparatus configured to receive the electromagnetic radiation from the eye, wherein the first reflective film and the second reflective film are positioned such that the electromagnetic radiation from the eye is reflected by the second reflective film on the second side surface of the lens toward the first reflective film on the first side surface of the lens, and in turn reflected by the first reflective film toward the imaging apparatus, wherein a plane in which an optical axis of the lens is located divides both the first side surface and the second side surface into a upper half surface and a lower half surface, wherein the first reflective film is arranged at the lower half surface of the first side surface of the lens and no reflective film is arranged at the entire upper half surface of the first side surface of the lens, and wherein the second reflective film is arranged at the upper half surface of the second side surface of the lens and no reflective film is arranged at the entire lower half surface of the second side surface of the lens.