Heart rate module

A heart rate module comprising a housing structure composed of a rear housing and a light-transmitting cover plate, wherein:

• a printed circuit board (PCB) assembly is disposed in the housing structure;
• the PCB assembly includes a PCB, a first photodiode (PD), a second PD, and a light emitting diode (LED), wherein the PDs and the LED are fixed on the PCB at a predetermined distance;
• a hot melt positioning column is disposed on the rear housing, and the PCB assembly is fixed on the rear housing through the hot melt positioning column;
• a plurality of through-slots are provided on the rear housing;
• each of the through-slots is used to accommodate one of the PDs or the LED;
• grating baffles for preventing optical interferences are respectively formed between the through-slots;
• the grating baffles comprise a first grating baffle preventing the optical interferences between the first PD and the LED and a second grating baffle preventing the optical interferences between the second PD and the LED;
• and
• a black silk screen is provided in an area other than a position corresponding to that of the PDs and the LED, on a surface of the light-transmitting cover plate, so as to form a light-transmitting window at the position corresponding to that of the PDs and the LED.