Cathode ray tube display of a motion picture film

Claim 2

In an improved method of displaying image of respective frames of an image bearing medium where an image is in accordance with the opacity of said medium, said frames being transported at a desired frame rate through a scanning field of an optical scanner where a light spot is directed upon a receiving side of a scanned frame, a video signal having a value proportional to light emanating from a transmission side thereof being provided to a display where a beam traces a viewing raster on a viewing surface, including the steps of: generating a displacement signal having a value substantially proportional to the time integral of said frame rate; deflecting said light spot vertically in proportion to the sum of the vertical deflection of said display beam and the value of said displacement signal and horizontally in proportion to the horizontal deflection of said display beam, whereby a scanning raster is traced by said light spot; comparing said displacement reference signal having a value representative of the displacement of a scanned frame which is about to pass from the scanning field; changing said displacement signal to a value corresponding to the displacement of the succeeding frame to be scanned by said light spot in response to the value of said displacement signal being at least equal to the value of said displacement reference signal; the improvement comprising: providing respective reference locations on said frames; providing a source of error signals; deflecting said light spot to the refeRence location of said scanned frame, the deflection thereto being in proportion to the sum of the value of said displacement signal, and the value of an error signal, the value of said error signal being representative of an undesired shift in said scanning raster; providing an error deflection signal with a value thereof having a known relationship to the value of said error signal; and vertically deflecting in said light spot in proportion to the value of said error deflection signal in a direction tending to cause a reduction of the undesired shift in said scanning raster.

Claim 3

The method of claim 1 wherein the value of said error deflection signal is proportional to the integral of the value of said error signal and said medium is transported in response to a drive signal having a value proportional to said desired frame rate.

Claim 4

The method of claim 2 wherein said displacement signal is proportional to the sum of the value of said error deflection signal and the time integral of the value of said drive signal.

Claim 5

The method of claim 1 wherein said light spot is deflected to said reference location during a vertical retrace time of said scanning raster.

Claim 6

The method of claim 1 wherein said light spot is deflected to said reference location during a horizontal retrace time of said scanning raster.

Claim 7

An improved apparatus for displaying images of respective frames on an image bearing medium where an image is in accordance with the opacity of said medium, said frames having respective reference locations provided thereon, said medium being transported by a drive unit at a desired frame rate through a scanning field of an optical scanner which provides a light spot to the receiving side of a scanned frame within said scanning field, the image of said scanned frame being displayed on a display of the type where a beam traces a viewing raster on a viewing surface, the apparatus being of the type having; means connected to said display and disposed to receive light emanating from a transmission side of said scanned frame, said means providing to said display a video signal representative of the intensity of said emanating light; integrator means having a first input connected for response to the value of a drive signal provided by said drive unit for provididng a displacement signal having a value substantially proportional to the time integral of said frame rate; a displacement reference signal source for providing a reference signal having a value representative of the displacement of a scanned frame which is about to pass from the scanning field; comparison means connected to said integrator means and said displacement reference signal source for providing a comparison signal indicative of the value of said displacement signal being at least equal to the value of said displacement reference signal; resetting means connected to said comparison means and said integrator means for resetting said integrator means to change the value of said displacement signal to correspond to the displacement of a succeeding frame in said scanning field in response to said comparison signal, whereby said succeeding frame becomes said scanned frame; generating means for providing horizontal and vertical sawtooth signals having amplitudes respectively proportional to the horizontal and vertical displacement of said display beam on said viewing surface; and deflection means connected to said integrator means, said generating means and said scanner for vertically and horizontally deflecting said light spot to trace a scanning raster in concurrent response to said sawtooth signals and said displacement signal, said light spot being vertically deflected in proportion to the sum of the value of said displacement signal and the vertical deflection of said display beam and horizontally deflected in proportion to the horizontal deflection of said display beam; the improvement comprising: TV search means connected to said deflection means, sAid integrator means and said generating means for causing a TV search deflection of said light spot to the reference location of said scanned frame during a retrace time of said scanning raster, said TV search deflection being in proportion to the sum of the values of said displacement and a sawtooth voltage concurrent with said TV search deflection, the value of said concurrent sawtooth voltage being in error signal representative of an undesired shift in said scanning raster, said error signal being provided to a second input of said integrator means whereby said displacement signal is proportional to the time integral of the sum of the values of said drive signal and said error signal.

Claim 8

An improved apparatus for displaying images of respective frames on an image bearing medium where an image is in accordance with the opacity of said medium, said frames having respective reference locations provided thereon, said medium being transported by a drive unit at a desired frame rate through a scanning field of an optical scanner which provides a light spot to the receiving side of a scanned frame within said scanning field, the image of said scanned frame being displayed on a display of the type where a beam traces a viewing raster on a viewing surface, the apparatus being of the type having; means connected to said display and disposed to receive light emanating from a transmission side of said scanned frame, said means providing to said display a video signal representative of the intensity of said emanating light; integrator means having a first input connected for response to the value of a drive signal provided by said drive unit for provididng a displacement signal having a value substantially proportional to the time integral of said frame rate; a displacement reference signal source for providing a reference signal having a value representative of the displacement of a scanned frame which is about to pass from the scanning field; comparison means connected to said integrator means and said displacement reference signal source for providing a comparison signal indicative of the value of said displacement signal being at least equal to the value of said displacement reference signal; resetting means connected to said comparison means and said integrator means for resetting said integrator means to change the value of said displacement signal to correspond to the displacement of a succeeding frame in said scanning field in response to said comparison signal, whereby said succeeding frame becomes said scanned frame; generating means for providing horizontal and vertical sawtooth signals having amplitudes respectively proportional to the horizontal and vertical displacement of said display beam on said viewing surface; and deflection means connected to said integrator means, said generating means and said scanner for vertically and horizontally deflecting said light spot to trace a scanning raster in concurrent response to said sawtooth signals and said displacement signal, said light spot being vertically deflected in proportion to the sum of the value of said displacement signal and the vertical deflection of said display beam and horizontally deflected in proportion to the horizontal deflection of said display beam; the improvement comprising: TV search means connected to said deflection means, sAid integrator means and said generating means for causing a TV search deflection of said light spot to the reference location of said scanned frame during a retrace time of said scanning raster, said TV search deflection being in proportion to the sum of the values of said displacement and a sawtooth voltage concurrent with said TV search deflection, the value of said concurrent sawtooth voltage being in error signal representative of an undesired shift in said scanning raster, said error signal being provided to a second input of said integrator means whereby said displacement signal is proportional to the time integral of the sum of the values of said drive signal and said error signal.

Claim 9

Apparatus according to claim 6 wherein said TV search means comprises means responsive to said generating means for providing said TV search deflection during a vertical retrace of said scanning raster.

Claim 10

Apparatus according to claim 7 wherein said medium is a motion picture film and the reference location of said scanned frame is a sprocket hole, said TV search means comprising: photomultiplier means displaced to receive light from said sprocket hole and provide a sprocket signal in response thereto; and means connected to said photomultiplier means for providing said error signal in concurrent response to said vertical sawtooth voltage and said sprocket signal.

Claim 11

Apparatus according to claim 8 additionally comprising means for storing said error signal.

Claim 12

Apparatus according to claim 6 wherein said TV search means comprises means responsive to said generating means for providing said TV search deflection during a horizontal retrace of said scanning raster.

Claim 13

Apparatus according to claim 10 wherein said medium is a motion picture film and the reference location of said scanned frame is a sprocket hole, said TV search means comprising: photomultiplier means disposed to receive light from a sprocket hole of said film and provide a sprocket signal in response thereto; and means connected to said photomultiplier means for providing said error signal in concurrent response to said horizontal sawtooth voltage and said sprocket signal.

Claim 14

Apparatus according to claim 11 additionally comprising means for storing said error signal.

Claim 15

An improved apparatus for displaying images of respective frames on an image bearing medium where an image is in accordance with the opacity of said medium, said frames having respective reference locations provided thereon, said medium being transported by a drive unit at a desired frame rate through a scanning field of an optical scanner which provides a light spot to the receiving side of a scanned frame within said scanning field, the image of said scanned frame being displayed on a display of the type where the beam traces a viewing raster on a viewing surface, the apparatus being of the type having; means connected to said display and disposed to receive light emanating from a transmission side of said scanned frame, said means providing to said display a video signal representative of the intensity of said emanating light; integrator means connected for response to the value of a drive signal provided by said drive unit for providing a displacement signal having a value substantially proportional to the time integral of said frame rate; a displacement reference signal source for providing a reference signal having a value representative of the displacement of a scanned frame which is about to pass from the scanning field; comparison means connected to said integrator means and said displacement reference signal source for providing a comparision signal indicative of the value of said displacement signal being at least equal to the value of said displacement reference signal; resetting means connected to said comparison means and said integrator means for resetting said integrator means to change the value of said displacement signal to correspond to the displacement of a suCceeding frame in said scanning field in response to said comparison signal, whereby said succeeding frame becomes said scanned frame; generating means for providing horizontal and vertical sawtooth signals having amplitudes respectively proportional to the horizontal and vertical displacement of said display beam on said viewing surface; and deflection means connected to said integrator means, said generating means and said scanner for vertically and horizontally deflecting said light spot to trace a scanning raster in concurrent response to said sawtooth signals and said displacement signal, said light spot being vertically deflected in proportion to the sum of the value of said displacement signal and the vertical deflection of said display beam and horizontally deflected in proportion to the horizontal deflection of said display beam; the improvement comprising: TV search means connected to said deflection means, said integrator means and said generating means for causing a TV search deflection of said light spot to the reference location of said scanned frame during a retrace time of said scanning raster, said TV search deflection being in proportion to the sum of the values of said displacement and a sawtooth voltage concurrent with said TV search deflection, the value of said concurrent sawtooth voltage being an error signal representative of an undesired shift in said scanning raster, said error signal being provided to said deflection means to cause a proportional vertical deflection of said light spot, said vertical deflection being in a direction tending to reduce said error signal.

Claim 16

An improved apparatus for displaying images of respective frames on an image bearing medium where an image is in accordance with the opacity of said medium, said frames having respective reference locations provided thereon, said medium being transported by a drive unit at a desired frame rate through a scanning field of an optical scanner which provides a light spot to the receiving side of a scanned frame within said scanning field, the image of said scanned frame being displayed on a display of the type where the beam traces a viewing raster on a viewing surface, the apparatus being of the type having; means connected to said display and disposed to receive light emanating from a transmission side of said scanned frame, said means providing to said display a video signal representative of the intensity of said emanating light; integrator means connected for response to the value of a drive signal provided by said drive unit for providing a displacement signal having a value substantially proportional to the time integral of said frame rate; a displacement reference signal source for providing a reference signal having a value representative of the displacement of a scanned frame which is about to pass from the scanning field; comparison means connected to said integrator means and said displacement reference signal source for providing a comparision signal indicative of the value of said displacement signal being at least equal to the value of said displacement reference signal; resetting means connected to said comparison means and said integrator means for resetting said integrator means to change the value of said displacement signal to correspond to the displacement of a suCceeding frame in said scanning field in response to said comparison signal, whereby said succeeding frame becomes said scanned frame; generating means for providing horizontal and vertical sawtooth signals having amplitudes respectively proportional to the horizontal and vertical displacement of said display beam on said viewing surface; and deflection means connected to said integrator means, said generating means and said scanner for vertically and horizontally deflecting said light spot to trace a scanning raster in concurrent response to said sawtooth signals and said displacement signal, said light spot being vertically deflected in proportion to the sum of the value of said displacement signal and the vertical deflection of said display beam and horizontally deflected in proportion to the horizontal deflection of said display beam; the improvement comprising: TV search means connected to said deflection means, said integrator means and said generating means for causing a TV search deflection of said light spot to the reference location of said scanned frame during a retrace time of said scanning raster, said TV search deflection being in proportion to the sum of the values of said displacement and a sawtooth voltage concurrent with said TV search deflection, the value of said concurrent sawtooth voltage being an error signal representative of an undesired shift in said scanning raster, said error signal being provided to said deflection means to cause a proportional vertical deflection of said light spot, said vertical deflection being in a direction tending to reduce said error signal.

Claim 17

Apparatus according to claim 13 wherein said TV search means comprises means responsive to said generating means for providing said TV search deflection during a vertical retrace of said scanning raster.

Claim 18

Apparatus according to claim 14 wherein said medium is a motion picture film and the reference location of said scanned frame is a sprocket hole, said TV search means comprising: photomultiplier means displaced to receive light from said sprocket hole and provide a sprocket signal in response thereto; and means connected to said photomultiplier means for providing said error signal in concurrent response to said vertical sawtooth voltage and said sprocket signal.

Claim 19

Apparatus according to claim 15 additionally comprising means for storing said error signal.

Claim 20

Apparatus according to claim 13 wherein said TV search means comprises means responsive to said generating means for providing said TV search deflection during a horizontal retrace of said scanning raster.

Claim 21

Apparatus according to claim 17 wherein said medium is a motion picture film and the reference location of said scanned frame is a sprocket hole, said TV search means comprising: photomultiplier means disposed to receive light from a sprocket hole of said film and provide a sprocket signal in response thereto; means connected to said photomultiplier means for providing said error signal in concurrent response to said horizontal sawtooth voltage and said sprocket signal.

Claim 22

Apparatus according to claim 18 additionally comprising means for storing said error signal.