Temperature information of each of a plurality of memories of a WideIO memory device is acquired. Based on the principle of light group field effect, the device can increase the luminous flux and light intensity per unit area of excident light by use of lens array group so that the photoelectric conversion system is able to get more light energy. The diffractive optical element has at least three diffraction optical parts in the boundary areas of the respective layers. A filter stage is utilized to receive the signal and produce a conditioned signal representative of one of a pair of binary states.