| 摘要 |
In the optical distance measuring device of the invention, a second optical path is formed by a transparent resin formed in a region where a light emitting element and a second light receiving part are connected directly to each other. As the temperature increases, the length of the optical path increases while its refractive index decreases, so that the optical path length itself becomes generally constant. Therefore, the length of the second optical path can be kept generally constant independently of temperature. Further, a first light receiving part for a first optical path and a second light receiving part for the second optical path 18 are formed in one identical light receiving element. Therefore, characteristic variations of the first light receiving part and the second light receiving part due to temperature can be reduced. This optical distance measuring device can achieve high distance measuring accuracy even under environments of intense temperature changes.
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