Abstract: A focal plane shutter for a video camera has a pair of disks rotated in the same direction about a common axis in synchronism with the raster scan blanking interval. The disks each have one or more openings which overlie one another to define a light admitting shutter aperture positioned to illuminate the video pickup device. An adjustment mechanism allows continuous adjustment of the shutter aperture while the disks are rotating. The adjustment mechanism has a slotted tube keyed to a pair of co-axial hub members which are adjustably rotated relative to one another when the slotted tube is moved axially.

Abstract: A focal plane shutter for a video camera has a pair of disks rotated in the same direction about a common axis in synchronism with the raster scan blanking interval. The disks each have one or more openings which overlie one another to define a light admitting shutter aperture positioned to illuminate the video pickup device. The opening in at least one of the disks is counterbalanced during rotation by a recessed relief area which does not extend through the disk, or by a weighted plate attached to the disk.

Abstract: A focal plane shutter for a video camera has a pair of disks rotated in the same direction about a common axis in synchronism with the raster scan blanking interval. The disks have openings which overlie one another and define a light admitting shutter aperture positioned to illuminate the video pickup. Each opening is bounded on first and second sides by lines emanating from a point on the disk which is offset from the disk's axis of rotation preferably by a distance equal to the length of the diagonal of the raster. This enables an even exposure of the video pickup, of equal areas at equal times, no matter where the pickup is positioned relative to the disk's axis of rotation.

Abstract: A focal plane shutter for a video camera has a pair of disks rotated in the same direction about a common axis in synchronism with the raster scan blanking interval, at a nominal rotational rate of 3600 rpm. The disks each have a single opening which overlie one another to define a single light admitting shutter aperture positioned to illuminate the video pickup once per revolution. Stop action or slow motion studies are greatly improved by the increase in shutter speed resulting from this single aperture shutter.

Abstract: A focal plane shutter for a video camera has a pair of disks rotated in the same direction about a common axis in synchronism with the raster scan blanking interval. The phase relationship or relative angular positions of the disks can be continuously varied, while the disks are rotating in use, to vary the shutter speed or exposure time. Mechanisms for continuously varying the angular positions of the disks include mechanical linkages and hydraulic systems.