| 摘要 |
A rotor contains a plurality of lenses spaced about its axis at a constant distance therefrom. As it turns each lens successively forms an image of a narrow area moving along a straight scanning line. The image is formed adjacent a point eccentric of the rotor axis, the eccentricity being computed so that this point remains stationary as the rotor turns. A stationary plane mirror placed inside the lens circle displaces the image to a convenient location. Photocells are placed there. Preferably illumination of said narrow area of the record is through a lens of the rotor from a line-like area of light.
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