| 摘要 |
PURPOSE:To enable the production of a hologram suited for mass production, by disposing an imaging lens so as to increase further the angle of exit light with respect to the axial line direction of the revolving shaft of a rotary disc. CONSTITUTION:A titled scanner consists of a hologram 2 recorded with a pattern consisting of a diffraction grating on a rotary disc 1 and an imaging lens 10 provided on the exit side of the light beam from the hologram 2. The lens 10 is so disposed as to increase further the angle of the exit light with respect to the axial line direction of the revolving shaft 2 of the disc 1. |
