LIGHT-RADIATING DEVICE FOR PHOTOSENSOR Russian patent published in 1996 - IPC

FIELD: microelectronics; photosensors. SUBSTANCE: light radiating device has two light-emitting diodes mounted onto substrate, photodiode and transparent protection coating. The latter is made in form of semisphere disposed above light-emitting diodes and photodiode. There is epoxy resin layer above protection coating. Epoxy resin layer is separated from the coating by air gap with thickness being longer than wavelength of radiation of light-emitting diodes. Epoxy resin layer provides absorption of radiation with wavelengths being out of wavelength band of light-emitting diodes. According to the second variant of the device, there is epoxy resin layer onto the protection coating; refractivity of the epoxy resin layer is lower than refractivity of protection coating. EFFECT: improved reliability of operation. 3 cl, 7 dwg