| 摘要 |
PURPOSE:To prepare a negative hologram easily, by constituting an indicator in the finder of a camera using a relief type hologram, by use of a high degree diffracted light beam. CONSTITUTION:On a relief diffracted grid which has been formed on a focusing plate 15 of a cinecamera, etc. is provided a reflection film by means of vapor deposition, and when a focusing plate 8 which has been embedded by a transparent adhesive agent 18 and a cover 19 is irradiated by a white light source, a diffracted light beam 23 reproduces an information mark. A light beam 24 is a ''0'' degree diffracted light beam. In this case, in order that an N-degree diffracted light beam (N>=2) proceeds to a finder optical system, a relief diffracted grid is formed so as have an inclined surface of (1/2).sintheta. Since an N-degree light beam is used, a pitch of the grid becomes N times, which is advantageous in manufacture. |
