Reflective photosensor and semiconductor light emitting apparatu

Details Reflective photosensor and semiconductor light emitting apparatu Reflective photosensor and semiconductor light emitting apparatu

1990-06-06

1992-07-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

357 19, 359565, H01J 314, G02B 2744, H01L 3112

Patent

active

051305313

ABSTRACT:
In a reflective photosensor in which a light emitting element and a light receiving element are disposed in a mold resin, a planar optical element (micro Fresnel lens) including a first lens section for projecting a light emitted from the light emitting element toward a sense object in an external space and a second lens section for introducing a reflection light reflected from the sense object to the light receiving element is arranged in the mold resin. Favorably, the light emitting element is a light emitting diode of an edge emitting type and is set in a posture in which the element lies on its side. A reflection mirror is disposed in the model resin to introduce a light emitted from the light emitting diode to the first lens section.

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Y. Ito, S. Ogata and K. Imanaka "Minimized Reflective Photomicrosensor with Micro Fresnel Lens" 1989 Autumn National Conv. Record, The Institute of Electronics, Information and Communication Engineers, Part 4, Communications.Electronics, C-196, Sep. 12-15, 1989, Yokohama.

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