is a diagram illustrating the resulting transmittance spectrum t 410 u2014 1 of the ir pass filter 410 of the present invention from fig5 a in the sensitive range for the optical sensor 120 the red cfa 112 r is only transparent to red light and ir the blue cfa 112 b is only transparent to blue light and ir the green cfa 112 g is only transparent to green light and ir in the infrared range the optical coating 111 with the first setting has a low transmittance opaque with a wavelength from 900 nm to 1000 nm by combining the transmittance spectrums t 111 u2014 1 t 112r t 112b and t 112g the transmittance spectrum t 410 u2014 1 of the ir pass filter 410 is obtained as shown in fig5 b the ir pass filter 410 is only transparent from 780 nm to 900 nm between the sensitive range for the optical sensor 120 therefore the ir sensing device 400 senses the light emitted from an led of 850 nm type please refer to fig6 fig6 a is a diagram illustrating the transmittance spectrums t 111 u2014 2 t 112r t 112b and t 112g respectively of the optical coating 111 with the second setting the red cfa 112 r the blue cfa 112 b and the green cfa 112 g of the present invention fig6 b is a diagram illustrating the resulting transmittance spectrum t 410 u2014 2 of the ir pass filter 410 of the present invention from fig6 a the transmittance spectrum t 111 u2014 2 has a low transmittance with a wavelength from 750 nm to 880 nm in the infrared range by combining the transmittance spectrums t 111 u2014.