Apparatus for selectively viewing a plurality of recording elements

Apparatus having a source of illumination for illuminating selected images from interchangeable sets of photographic disks, each disk having a circular array of image frames interrupted by an open segment;

• the disks in each set being positioned with their open segments initially aligned, the disks being supported for rotation about a common axis passing through the center of the disks, said apparatus comprising:
• a gate defining a plane and an illumination axis;
• means for removably receiving a selected one of the interchangeable sets of photographic disks with their open segments aligned on said illumination axis;
• means for directing illumination from the source along said illumination axis through the plane;
• means for effecting relative positioning between the disks and said gate to position a selected disk in the plane;
• a segment key positionable into the open segments of the disks other than the selected disk for maintaining alignment of such open segments on the illumination axis;
• and
• means for rotating the selected disk about the common axis to position a selected frame on the illumination axis.

Apparatus for selectively viewing information from interchangeable sets of recording elements;

• the recording elements each including a flat support bearing a circular array of information interrupted by an open section where the support is discontinuous;
• each set of recording elements including means for supporting the elements on a common axis and means for releasably aligning the recording elements with their open sections aligned parallel to the common axis;
• said apparatus comprising:
• a viewing mechanism including a viewing head and defining a viewing axis and a viewing plane;
• means for removably receiving a set of recording elements with the open sections aligned on said viewing axis;
• means for effecting relative movement between the recording elements and said viewing head to position a selected recording element in said viewing plane;
• means for releasing the aligning means to permit rotation of the selected recording element;
• means for engaging the edges of the open sections of the elements not selected to maintain such open sections in alignment on said viewing axis;
• and
• means for rotationally positioning the selected recording element relative to said viewing head to permit viewing of the information on the selected element.

Apparatus for optically viewing selected image frames of interchangeable sets of film elements;

• the film elements each having a film disk, a hub supporting the film disk, a plurality of image frames disposed circularly about such hub and a peripheral notch, the hub having a central aperture and a keyway on the periphery thereof;
• each of said sets including a plurality of film elements, a spindle extending through the apertures of the plurality of film elements for rotatably supporting the same, and an elongate releasable key mounted on the spindle for engaging the keyways of the plurality of film elements of the set with their notches thereby aligned to define a channel along the set substantially parallel to the spindle axis;
• said apparatus comprising:
• a gate defining a viewing position;
• means for removably supporting one of the interchangeable sets of film elements with the spindle of the set oriented so that the channel is aligned with said gate;
• means for moving the received set longitudinally relative to said gate, to align a selected one of the film elements with said gate;
• a restraining member actuatable to engage and prevent rotation of those film elements not aligned with said gate;
• means for disengaging said releasable key from engagement with the keyway and actuating said restraining member;
• and
• means for rotating the film element aligned with the gate to dispose selected frames thereof in said viewing position.