Scanning-area rotation device for an image pickup tube
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsJunichi Yamanaka, Noboru Nakamura, Hirokazu Fujiki, Yoshimori Miyaji
Life of this patent
Estimating the term…
Abstract
A scanning-area rotation device for an image pickup tube has a coil (10) for rotating a scanning-area by an electron beam on the target surface of an image pickup tube (14), a shield ring (46) for electrostatically shielding the coil (10) from the target of the image pickup tube (14), and a shield cover (44) for magnetically shielding the coil (10). The shield ring (46) electrostatically shields the target and signal circuit connecting to the target from the coil (10), but does not shield a magnetic flux from the coil (10) to the target. The shield cover (44) shields a magnetic flux developed by the coil (10) and extending to the exterior of the cover (44).
Claims7
A scanning-area rotation device for an image pickup tube comprising:
- an image pickup tube having a target including a target face
- first means, positioned near the outer periphery of the target, for providing a static magnetic field to said target face in order to rotate a scanning-area thereof by electron beams on said target face;
- and
- second means for electrostatically and not magnetically shielding said first means from the target.
A scanning-area rotation device for an image pickup tube comprising:
- an image pickup tube having a target including a target face;
- first means positioned near the outer periphery of the target, for providing a static magnetic field to said face in order to rotate a scanning-area thereof by electron beams on said target face;
- second means for electrostatically and not magnetically shielding said first means from the target and a signal path connecting to the target;
- and
- means for electromagnetically shielding said first means and the target from the exterior of said image pickup tube.
Dependencies are inferred from the claim text.