| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a reflection-type optically coupled device which is enhanced in light collection efficiency, where light emitting from a light emitting device is prevented from impinging on a photodetecting device when a detected object is not present. SOLUTION: A reflective-type optically coupled device is provided with a light emitting side transparent primary molded body 11 which seals up a light emitting device 10, a photodetecting-side transparent primary molded body 13 which seals up a photodetecting device 12, a light emitting-side lens 14 disposed in a positioning recess 18 provided to the front side of the light projecting face of the light emitting-side transparent primary molded body 11, a photodetecting-side lens 15 disposed in a positioning recess 19 provided to the front side of the light receiving face of the photodetecting-side transparent primary molded body 13, and a light screening secondary molded body 16 which seals up the primary sealed bodies 11 and 13 and the lenses 14 and 15 coming into contact with the fixed parts 14a and 15a of the lenses 14 and 15. Refractive index changing gaps 20 and 21 are provided between the lenses 14 and 15 and the primary molded bodies 11 and 13, respectively.</p> |
