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OPTICAL AXIS -OBJECTIVE LENS
CYLINDRICAL LENS
FIRST REFOCUSINC LENS
TWO FIRST SURFACE MIRRORS AT 90 DEGREES (ONE NOT SHOWN)
SECOND REFOCUSINC LENS SPINNING DISK TACHOMETER GENERATOR
Fig. 6. Vertical section of camera, through axis of rotation, showing mechanical details.
Isotran system in the form used in the new camera. This arrangement differs from that of Fig. 2 by the insertion of five stationary first-surface mirrors, for the purpose of bending the optical path around a nearly closed path, in such a manner that the moving pairs of mutually perpendicular mirrors can be carried in the outer periphery of the spinning disk, while the photosensitive film is carried on the inside of a ledge forming an integral part of the same spinning disk.
With this arrangement, the first and second refocusing lenses are mounted with parallel optical axes. One stationary mirror is used in each of three
positions: between the primary image and the first refocusing lens; between the two refocusing lenses, on the axis of the first refocusing lens; and between the second refocusing lens and the film. Two stationary mirrors are used in the position between the two refocusing lenses, on the axis of the second refocusing lens. These two mirrors, mutually perpendicular, are used, instead of a single plane mirror, to reverse the direction of movement of the final image on the film. Otherwise, the final image would move at the same speed as the film but in the opposite direction. Figure 6 is a somewhat simplified longitudinal section through the axis
Miller and Scharf: Isotransport Camera
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