| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable a user to confirm a visitor even without going to a place in front of the liquid crystal screen of a master unit with a monitor installed on a wall surface of a living room even when the user often looks at the liquid crystal screen from the right side, the left side, or downward or upward. <P>SOLUTION: A video interphone system is provided with a film 1 wherein many Littrow prisms 2 having angles of 30°, 60° and 90° with a mirror finished surface 3 on the entire surface sandwiched by the angles 30° and 90° are arranged on a transparent sheet 4 at equal intervals t, a doorphone slave unit 10 with a camera having a camera 11 for picking up an image, and a master unit 20 with a monitor 21 for projecting the image picked up by the camera 11. The angle of view of the monitor liquid crystal screen 21a is provided on the front, right, left, upward or downward side by sticking the film 1 onto the monitor liquid crystal screen 21a of the master unit 20 with a monitor. <P>COPYRIGHT: (C)2004,JPO |
