| 摘要 |
<p>The electronic sight hole is comprised of a casing made of plastic or metal material which has a quadrangular or similar plane form, inside which is provided an electronic circuitry fixed by means of screws to the casing from which emerges at its central portion a cylindrical externally threaded lens, the casing having incorporated a rubber circular band or seal situated at the rise of the lens and backed against the walls of the casing, one extremity of the casing having an outlet for a cable or, passing through the interior of the central area and arranged next to the lens or camera, an internally threaded hollow cylindrical part provided at its external extremity with a circular tinted cristal, all components being inserted in the hole of the door sight hole, and screwed to each other thereby forming a sight hole, with optionally the possiblity of disposing a complementary sight hole aligned at the top part and provided with an infrared ray emitter for viewing images in the obscurity.</p> |
