| 摘要 |
<p>PURPOSE:To form the titled device of reflection type inexpensive and thin by a method wherein light emitting elements and light receiving elements are integrally sealed with a photo-permeable resin in which lenses have beeen formed, so that the optical axis of each lens may not present even with the optical axis of each element. CONSTITUTION:The light emitting elements 1 and the light receiving elements 2 are alternately mounted on a lead frame 9 and bonded with wires. Thereafter, the light emitting and light receiving elements are sealed with the photo-permeable resin 8. At this time, a lens with the optical axis out of agreement with the optical axis of the element is formed on the surface of the photo-permeable resin opposed to the element surface. The intensity of light radiated out of the light emitting element is stronger toward the lens, and the light reflected on a reflector 11 becomes incident to the light receiving element with sensitivity enhanced in the direction of a lens. Since the light emitting elements and light receiving elements are integrally sealed with a photo-permeable resin, grooves 12 are provided between the former elements so as to prevent the direct interference of these elements. Then, the whole is housed in a light shielding case 13 fitted to the resin-sealed outer shape into a reflection type interruptor.</p> |
