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US 4,699,483 AGranted
Device for adjusting a video tape camera shutter mechanism
OwnerSteven L. Swinehartinventor
Life of this patent
Estimating the term…
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.
Claims24
A focal plane shutter for a video camera having a lens and pickup comprising:
- first disk means disposed between said lens and said pickup for rotation about an axis, said first disk means defining an annular locus in registration with said pickup and having at least a first opening intersecting said locus;
- second disk means disposed between said lens and said pickup for rotation about said axis, said second disk means having at least a second opening in registration with said locus;
- said first and second opening being registrable to define a light admitting aperture between said lens and said pickup;
- means for rotating said first and second disk means:
- means for continuously adjusting the relative angular positions of said first and second disk means while said disk means are rotating to thereby adjust the size of said light admitting aperture, and
- said means for continuously adjusting the angular positions of the disks comprising a first hub member connected to said first disk means, a second hub member coaxial with said first hub member and connected to said second disk means, and means for adjustably moving said first and second hub members relative to one another, said means for adjustably moving said first and second hub members comprising a tubular member disposed coaxial within said hub members and having a plurality of non-axially aligned slots therein, and dowel pin means connected to said first and second hub members and moveably disposed in said slots of said tubular member for allowing rotation of said first and second hub members relative to said tubular member and for allowing rotation of said first hub member and said second hub member relative to each other as said dowel pin means move along said slots in said tubular member.
3 more elements
A focal plane shutter for a video camera having a lens and pickup comprising:
- first disk means disposed between said lens and said pickup for rotation about an axis, said first disk means defining an annular locus in registration with said pickup and having a first opening intersecting said locus;
- second disk means disposed between said lens and said pickup for rotation about said axis, said second disk means having a second opening in registration with said locus;
- said first and second openings being registrable to define a light admitting aperture between said lens and said pickup;
- said second disk means including means for substantially balancing said second disk means as it rotates;
- means for rotating said first and second disk means;
- means for adjusting the relative angular positions of said first and second disk means while said first and second disk means are rotating to thereby adjust the size of said light admitting aperture;
- and
- said means for adjusting comprising a first hub member connected to said first disk means, and a second hub member coaxial with said first hub member and connected to said second disk means, and control means comprising a tubular member disposed coaxial within said hub members and having a plurality of non-axially aligned slots therein, and dowel pins means connected to said first and second hub members and moveably disposed in said slots of said tubular member for allowing rotation of said first and second hub members relative to said tubular member and for allowing rotation of said first member and said second member relative to each other as said dowel pin means move along said slots in said tubular member.
5 more elements
A focal plane shutter for a video camera having a lens and pickup comprising:
- first disk means disposed between said lens and said pickup for rotation about an axis, said first disk means defining an annular locus in registration with said pickup and having a first opening intersecting said locus;
- second disk means disposed between said lens and said pickup for rotation about said axis, said second disk means having a second opening in registration with said locus;
- said first and second openings being registrable to define a light admitting aperture between said lens and said pickup;
- means for substantially balancing said first disk means as it rotates;
- means for rotating said first and second disk means;
- means for adjusting the relative angular positions of said first and second disk means while said first and second disk means are rotating to thereby adjust the size of said light admitting aperture;
- and
- said means for adjusting comprising a first hub member connected to said first disk means, and a second hub member coaxial with said first hub member and connected to said second disk means, and control mans comprising a tubular member disposed coaxial within said hub members and having a plurality of non-axially aligned slots therein, and dowel pin means connected to said first and second hub members and moveably disposed in said slots of said tubular member for allowing rotation of said first and second hub member relative to said tubular member and for allowing rotation of said first member and said second member relative to each other as said dowel pin means move along said slots in said tubular member.
5 more elements
Dependencies are inferred from the claim text.