Light beam scanning

Claim 2

Light beam scanning apparatus for transducing information with a longitudinally driven moveable record medium, comprising; planar reflecting means rotatable about an axis which forms a given angle with the plane of said reflecting means, means for disposing first and second surface portions on the same side of said record medium in a plane substantially normal to said axis of rotation of said reflecting means, and in cooperative relation therewith, means for illuminating said reflecting means in substantially an axial direction to provide a redirected light beam from said reflecting means which is swept in conical manner when said reflecting means is rotated, and means for positioning said first and second record medium portions to laterally opposite sides of said rotational axis with each of said portions intercepting said light beam to provide separate series of arcuate scans at said first and second portions of said record medium.

Claim 3

Apparatus utilizing a light beam for scanning aN information bearing surface and recording said information on a moveable record medium, comprising: first scanning means having an axis of rotation substantially normal to said information surface and a rotatable planar reflector at a given angle with respect to said rotational axis, said rotatable reflecting means being responsive to the illumination thereof by a first light beam in the direction of said rotational axis to scan said beam in conical manner to cause arcuate portions of said surface to be illuminated, means for transducing light from said illuminated surface portions to a corresponding electrical signal, light beam modulating means operable to modulate a second light beam in accordance with said electrical signal applied thereto, second scanning means having an axis of rotation with a planar reflector at a given angle with respect to the rotational axis of said second scanning means, means for disposing at least a portion of said record medium in cooperative spaced relation with said second scanning means and substantially normal to its axis of rotation, and means for illuminating with said modulated light beam the planar reflector of said second scanning means substantially in its axial direction causing said modulated beam to be scanned in a conical manner illuminating arcuate portions of said record medium when said second scanning means is rotated.

Claim 4

Apparatus utilizing a light beam for scanning aN information bearing surface and recording said information on a moveable record medium, comprising: first scanning means having an axis of rotation substantially normal to said information surface and a rotatable planar reflector at a given angle with respect to said rotational axis, said rotatable reflecting means being responsive to the illumination thereof by a first light beam in the direction of said rotational axis to scan said beam in conical manner to cause arcuate portions of said surface to be illuminated, means for transducing light from said illuminated surface portions to a corresponding electrical signal, light beam modulating means operable to modulate a second light beam in accordance with said electrical signal applied thereto, second scanning means having an axis of rotation with a planar reflector at a given angle with respect to the rotational axis of said second scanning means, means for disposing at least a portion of said record medium in cooperative spaced relation with said second scanning means and substantially normal to its axis of rotation, and means for illuminating with said modulated light beam the planar reflector of said second scanning means substantially in its axial direction causing said modulated beam to be scanned in a conical manner illuminating arcuate portions of said record medium when said second scanning means is rotated.

Claim 5

In a recorder-reproducer system including apparatus for scanning a light beam to transduce information with a surface of a record medium wherein said record medium is subject to shrinkage which alters the dimensions of said scanned surface, the combination comprising; planar reflecting means rotatable about a given axis and relatively movable between first and second positions with respect to said record medium along said axis with the plane of said reflecting means forming a given fixed angle with respect to said rotation axis, means for disposing at least the portion of said surface of said record medium to be scanned in a plane substantially normal to the axis of rotation of said reflecting means, said given angle of said reflecting means being such that the redirect beam from said reflecting means is scanned in a conical manner to provide an arcuate path of given curvature across said surface when said reflecting means is rotated, whereby the given curvature of said arcuate path is determined in accordance with the one of said first and second positions occupied by said planar reflecting means.

Claim 6

In a recorder-reproducer system including apparatus for scanning a light beam to transduce information with a surface of a record medium wherein said record medium is subject to shrinkage which alters the dimensions of said scanned surface, the combination comprising; planar reflecting means rotatable about a given axis and relatively movable between first and second positions with respect to said record medium along said axis with the plane of said reflecting means forming a given fixed angle with respect to said rotation axis, means for disposing at least the portion of said surface of said record medium to be scanned in a plane substantially normal to the axis of rotation of said reflecting means, said given angle of said reflecting means being such that the redirect beam from said reflecting means is scanned in a conical manner to provide an arcuate path of given curvature across said surface when said reflecting means is rotated, whereby the given curvature of said arcuate path is determined in accordance with the one of said first and second positions occupied by said planar reflecting means.