| 摘要 |
A raindrop sensor in which a prism 6 that guides light emitted from a light-emitting element 91 and reflected at a surface of a windshield glass 2 to a light-receiving element 92 is mounted to the windshield glass via an optical contact, includes a bracket 3 configured to be fixed to the windshield glass 2, a cover 8 configured to be attachable to and detachable from the bracket 3, and a spring Sp configured to support the prism 6 in the cover 8 to be capable of advancing and retracting in a mounting direction to the windshield glass 2, and the optical contact is configured by a gas-permeable silicon sheet containing silicon oil. When the cover 8 is mounted to the bracket 3, the spring Sp and the optical contact are compressed in the mounting direction, and the prism 6 is brought into pressure contact with the windshield glass 2 via the optical contact. |
