Blanking method and apparatus for video film recorder

Claim 2

Video recording apparatus for recording video information recurring at a predetermined number of video fields per unit time as pictorial information in media frames on photosensitive media continuously advanced through a media scanning zone at a predetermined mumber of media frames per unit time differing from the predetermined number of video fields per unit time, said apparatus comprising: a. synchronizing means responsive to the predetermined number of media frames per unit time advanced through said media scanning zone and the predetermined number of video fields per unit time for producing a deflecting signal representative of the instantaneous position of the media frames on said photosensitive media continuously advanced through said media scanning zone; b. scanning means responsive to said video information for generating a beam of radiation modulated in intensity by said video information and for scanning said modulated beam of radiation in video field patterns of radiation recurring at said predetermined number of video fields per unit time and responsive to the deflecting signal for deflecting the video field patterns of radiation in synchronism with the media frames on said photosensitive media continuously advanced through said media scanning zone to superimpose each video field pattern on a media frame; c. exposure control means responsive to the predetermined number of media frames per unit time advanced through said media scanning zone and the predetermined number of video fields per unit time for maintaining the video field patterns superimposed on each media frame equal in number; d. counter means for counting and maintaining a count of the number of video fields; e. means responsive to the advancement of each media frame into said media scanning zone for resetting the count maintained in said counter means to zero; f. means for comparing the count maintained in said counter means to a predetermined number and for producing an inhibit signal when the count exceeds the predetermined number; and g. inhibit means responsive to the inhibit signal for inhibiting the operation of said scanning means in response to said video information until said scanning means superimposes a video field pattern on a succeeding media frame in response to the deflecting signal.

Claim 3

Video recording apparatus for recording video information recurring at a predetermined number of video fields per unit time as pictorial information in media frames on photosensitive media continuously advanced through a media scanning zone at a predetermined number of media frames per unit time differing from the predetermined number of video fields per unit time, said apparatus comprising: a. synchronizing means responsive to the predetermined number of media frames per unit time advanced through said media scanning zone and the predeterminEd number of video fields per unit time for producing a deflecting signal representative of the instantaneous position of the media frames on said photosensitive media continuously advanced through said media scanning zone; b. scanning means responsive to said video information for generating a beam of radiation modulated in intensity by said video information and for scanning said modulated beam of radiation in video field patterns of radiation recurring at said predetermined number of video fields per unit time and responsive to the deflecting signal for deflecting the video field pattern of radiation in synchronism with the media frames on said photosensitive media continuously advanced through said media scanning zone to superimpose each video field pattern on a predetermined media frame; c. exposure control means responsive to said scanning means and the predetermined number of video fields per unit time for maintaining the video field patterns superimposed on each media frame equal in number; d. counter means responsive to said scanning means for counting and maintaining a count of the number of video field superimposed on each media frame in response to the deflecting signal; e. means for comparing the count maintained in said counter means to a predetermined number and for producing an inhibit signal when the count exceeds the predetermined number; f. means for terminating the inhibit signal when said scanning means superimposes a video field pattern on a succeeding media frame in response to the deflecting signal; and g. inhibit means responsive to the inhibit signal for inhibiting the operation of said scanning means in response to said video information until said scanning means superimposes a video field pattern on a succeeding media frame.

Claim 4

Video recording apparatus for recording video information recurring at a predetermined number of video fields per unit time as pictorial information in media frames on photosensitive media continuously advanced through a media scanning zone at a predetermined number of media frames per unit time differing from the predetermined number of video fields per unit time, said apparatus comprising: a. synchronizing means responsive to the predetermined number of media frames per unit time advanced through said media scanning zone and the predeterminEd number of video fields per unit time for producing a deflecting signal representative of the instantaneous position of the media frames on said photosensitive media continuously advanced through said media scanning zone; b. scanning means responsive to said video information for generating a beam of radiation modulated in intensity by said video information and for scanning said modulated beam of radiation in video field patterns of radiation recurring at said predetermined number of video fields per unit time and responsive to the deflecting signal for deflecting the video field pattern of radiation in synchronism with the media frames on said photosensitive media continuously advanced through said media scanning zone to superimpose each video field pattern on a predetermined media frame; c. exposure control means responsive to said scanning means and the predetermined number of video fields per unit time for maintaining the video field patterns superimposed on each media frame equal in number; d. counter means responsive to said scanning means for counting and maintaining a count of the number of video field superimposed on each media frame in response to the deflecting signal; e. means for comparing the count maintained in said counter means to a predetermined number and for producing an inhibit signal when the count exceeds the predetermined number; f. means for terminating the inhibit signal when said scanning means superimposes a video field pattern on a succeeding media frame in response to the deflecting signal; and g. inhibit means responsive to the inhibit signal for inhibiting the operation of said scanning means in response to said video information until said scanning means superimposes a video field pattern on a succeeding media frame.

Claim 5

Apparatus for recording video information derived from composite video field signals including horizontal synchronizing signals recurring at a frequency Fh, vertical synchronizing signals recurring at a field rate frequency Fv and video information signals as pictorial information in media frames on photosensitive media continuously advanced through a media scanning zone at a frame rate frequency of Fm media frames per second differing from the field rate frequency Fv, said apparatus comprising: a. means for detecting the frame rate frequency of Fm media frames per second and for producing a frame rate signal having a frame rate frequency Fm; b. synchronizing means responsive to the frame rate signal and the vertical synchronizing signal for producing a vertical scan modification signal representative of the instantaneous position of Fm/N media frames continuously advancing through said media scanning zone, where N is an integer equal to the highest common mathematical divisor of both Fv and Fm; c. scanning means responsive to the video information signal for generating a beam of radiation modulated in intensity thereby; d. deflecting means responsive to the horizontal and vertical synchronizing signals for deflecting said modulated beam of radiation in a video field pattern of radiation recurring at the field rate Fv and responsive to the vertical scan modification signal for superimposing Fv/N video fields on Fm/N media frames continuously advanced through said media scanning zone; e. exposure control means responsive to the frame rate signal and the vertical synchronizing signal for maintaining the successive exposures of each media frame equal in number to the integer in the quotient of Fv/Fm video field patterns superimposed on each media frame; f. counter means for counting and maintaining a count of the number of video field patterns superimposed on each media frame and for resetting the count of said counter means to zero at each occurrence of a frame rate signal; g. means responsive to said counter means for producing an inHibit signal when the count exceeds Fm/N; h. means for terminating the inhibit signal when the circuit means superimposes a video field pattern on a succeeding media frame; and i. means responsive to the inhibit signal for inhibiting the operation of said scanning means in response to said video information until the inhibit signal is terminated.

Claim 6

Apparatus for recording video information derived from composite video field signals including horizontal synchronizing signals recurring at a frequency Fh, vertical synchronizing signals recurring at a field rate frequency Fv and video information signals as pictorial information in media frames on photosensitive media continuously advanced through a media scanning zone at a frame rate frequency of Fm media frames per second differing from the field rate frequency Fv, said apparatus comprising: a. means for detecting the frame rate frequency of Fm media frames per second and for producing a frame rate signal having a frame rate frequency Fm; b. synchronizing means responsive to the frame rate signal and the vertical synchronizing signal for producing a vertical scan modification signal representative of the instantaneous position of Fm/N media frames continuously advancing through said media scanning zone, where N is an integer equal to the highest common mathematical divisor of both Fv and Fm; c. scanning means responsive to the video information signal for generating a beam of radiation modulated in intensity thereby; d. deflecting means responsive to the horizontal and vertical synchronizing signals for deflecting said modulated beam of radiation in a video field pattern of radiation recurring at the field rate Fv and responsive to the vertical scan modification signal for superimposing Fv/N video fields on Fm/N media frames continuously advanced through said media scanning zone; e. exposure control means responsive to the frame rate signal and the vertical synchronizing signal for maintaining the successive exposures of each media frame equal in number to the integer in the quotient of Fv/Fm video field patterns superimposed on each media frame; f. counter means for counting and maintaining a count of the number of video field patterns superimposed on each media frame and for resetting the count of said counter means to zero at each occurrence of a frame rate signal; g. means responsive to said counter means for producing an inHibit signal when the count exceeds Fm/N; h. means for terminating the inhibit signal when the circuit means superimposes a video field pattern on a succeeding media frame; and i. means responsive to the inhibit signal for inhibiting the operation of said scanning means in response to said video information until the inhibit signal is terminated.

Claim 7

The apparatus of claim 3 wherein said photosensitive media comprises unexposed photosensitive color motion picture film, the video information signals further comprise chrominance and luminance signals and said scanning means comprises color scanning means for exposing said media frames to video field patterns modulated by the chrominance and luminance signals.

Claim 8

The apparatus of claim 3 further comprising video reproduction apparatus for deriving the composite video field signals from pictorial information in media frames on radiation transmissive information bearing media, wherein said information bearing media is continuously advanced by said advancing means through said media scanning zone at the frame rate frequency Fm and the media frames are scanned by said scanning means under the control of said deflecting means and said synchronizing means, said video reproduction apparatus further comprising: a. means for maintaining the beam of radiation generated by said scanning means at a constant intensity as it scans the media frames of said information bearing media, whereby said beam of radiation transmitted by the media frames is modulated in intensity by the pictorial information on said media frames; b. means for providing and applying horizontal synchronizing signals, recurring at the frequency Fh, and vertical synchronizing signals, recurring at the frequency Fv, to said deflecting means and said synchronizing means to control the production of video fields and the synchronization of the video field on the continuously moving media frames; c. optical-to-electrical signal transducer apparatus responsive to the beam of radiation modulated in intensity by the pictorial information on said media frames for producing video field luminance and chrominance signals in response to each scanned media frame; and d. means for preventing the operation of said exposure control means, whereby each video field pattern is superimposed on a media frame during the video reproduction of the pictorial information on the information bearing media.

Claim 9

The apparatus of claim 3 wherein Fv 60 fields per second, Fm 24 frames per second and N 12; and wherein said producing means produces an inhibit signal when the count exceeds Fm/N 24/12 2, whereby each media frame moving at 24 frames per second is exposed to two superimposed video fields, and exposure of the media frames to at least one out of every successive video fields is prevented by the inhibition of said scanning means.

Claim 10

The apparatus of claim 3 wherein Fv 60 fields per second, Fm 18 frames per second and N 6; and wherein said producing means produces an inhibit signal when the count exceeds Fm/N 18/6 3, whereby each media frame on said photosensitive media moving at 18 frames per second is exposed to three superimposed video field patterns, and exposure of the media frames to at least one out of every 10 successive video field patterns is prevented by the inhibition of said scanning means.

Claim 11

The apparatus of claim 3 including reset means responsive to each occurrence of a frame rate signal recurring at the frequency Fm for resetting the count of said counter means to zero.

Claim 14

The method of claim 9 wherein the final step of superimposing an equal number of video fields on each media frame further comprises the steps of: a. deflecting the video fields in synchronism with the frame rate Fm of the media frames to superimpose Fv/N video fields on Fm/N media frames continuously advanced through said media scanning zone wherein N is equal to the highest common integral mathematical divisor of both Fm and Fv; and b. reducing the intensity of the beam of radiation to zero for the time period that the counted number of video fields exceeds the integer in the quotient Fv/Fm.