Facsimile system

Claim 2

In a facsimile system, a transmitter unit of the type designed to convert information on an input copy into video for transmission to another location whereat a facsimile of said input copy is produced, the transmitter unit comprising: input means including means defining a scan station, means for driving an input copy inserted in said input means past said scan station at a uniform preselected rate, so that successive strips of said input copy are exposed thereat, means for illuminating said successive strips and means for sensing the leading and trailing edges of said input copy; light sensitive means for providing video as a function of light directed thereto; means for sweeping each illuminated strip and for directing light reflected therefrom to said light sensitive means; and output means for providing carrier signals of a first frequency during a first preselected period following the sensing of the leading edge of said input copy and for modulating carrier signals of a second frequency with said video following said first preselected period until the trailing edge of said input copy is sensed.

Claim 3

In a facsimile system as described in claim 1 wherein said output means further provide carrier signals of a third frequency for a second preselected period following the sensing of the trailing edge of said input copy.

Claim 4

In a facsimile system as described in claim 1 further including means for providing synchronizing pulses to said output means for modulating the carrier signals of at least one of the first and second frequencies therewith, and for controlling the sweeping of said strips therewith.

Claim 5

In a facsimile system as described in claim 3 wherein said means for sweeping include a galvanometer and drive means responsive to each synchronizing pulse for controlling said galvanometer to sweep across each strip during the intervals between successive synchronizing pulses.

Claim 6

In a facsimile system as described in claim 4 wherein said first and third frequencies are equal and wherein said output means modulate the carrier signals of said first frequency with said synchronizing pulses and the carrier signals of said second frequency with said synchronizing pulses and said video.

Claim 7

In a facsimile system of the type including a transmitter unit at a first station, and a receiver unit at a second station, the transmitter unit including means for converting recorded data into signals which are transmitted to said second station, and the receiver unit including means for converting the received signals into recorded data, the arrangement comprising: first means located in at least one of said first and second stations including optics means and a single galvanometer means, said optics means being adapted to direct light to said galvanometer means from a first direction in which recording data is adpated to be located, said galvanometer means and said optics means directing said light in a second direction at which light sensitive means are adapted to be located, and said optics means being further adapted to direct light to said galvanometer means from a third direction in which a source of modulated light is adapted to be located, the modulated light representing received data, said galvanometer means and said optics means directing said modulated light to a direction in which a data recording medium is adapted to be located; a source of synchronizing pulses providing synchronizing pulses at a selected frequency; and sweep control means coupled to said galvanometer means and responsive to said synchronizing pulses for controlling a mirror of said galvanometer means to be at a first position during each synchronizing pulse and for changing the mirror position linearly from said first position to a second position during each interval between synchronizing pulses.

Claim 8

In a facsimile system of the type including a transmitter unit at a first station, and a receiver unit at a second station, the transmitter unit including means for converting recorded data into signals which are transmitted to said second station, and the receiver unit including means for converting the received signals into recorded data, the arrangement comprising: first means located in at least one of said first and second stations including optics means and a single galvanometer means, said optics means being adapted to direct light to said galvanometer means from a first direction in which recording data is adpated to be located, said galvanometer means and said optics means directing said light in a second direction at which light sensitive means are adapted to be located, and said optics means being further adapted to direct light to said galvanometer means from a third direction in which a source of modulated light is adapted to be located, the modulated light representing received data, said galvanometer means and said optics means directing said modulated light to a direction in which a data recording medium is adapted to be located; a source of synchronizing pulses providing synchronizing pulses at a selected frequency; and sweep control means coupled to said galvanometer means and responsive to said synchronizing pulses for controlling a mirror of said galvanometer means to be at a first position during each synchronizing pulse and for changing the mirror position linearly from said first position to a second position during each interval between synchronizing pulses.

Claim 9

In a facsimile system of the type described in claim 6 wherein said optics means includes at least one dichroic mirror for transmitting light to said galvanometer means in the first direction and for reflecting light directed thereto from said galvanometer means to the direction in which said data recording medium is adapted to be located.

Claim 10

In a facsimile system the arrangement comprising: first means including optics means and galvanometer means of the type including a mirror rotatable about a fixed axis of rotation as a function of the amplitude of a signal applied to said galvanometer means and adapted to direct light modulated by recorded data to a direction in which light sensitive means of the type converting light directed thereto into an electrical signal are adapted to be located, said first means being further adapted to direct light of modulated intensity which is directed thereto to a location which a light exposable medium is adapted to be located; means for providing a succession of pulses of equal durAtions, the start of each pulse being at a fixed period following the end of a preceding pulse in said succession; and galvanometer control means coupled to said galvanometer means for controlling the amplitude of the signal applied to said galvanometer means to vary substantially linearly from a first level to a second level during each of said fixed periods and for controlling the signal amplitude to vary from said second level to said first level nonlinearly during each pulse duration, whereby the mirror of said galvanometer means rotates at a substantially uniform rate from a first position to a second position during each of said fixed periods and rotates back to said first position during each pulse duration from said second position at a nonuniform rate, so that as said signal amplitude starts to increase linearly from said first level to said second level at the start of each of said fixed periods, the mirror is at said first position.

Claim 11

In a facsimile system the arrangement comprising: first means including optics means and galvanometer means of the type including a mirror rotatable about a fixed axis of rotation as a function of the amplitude of a signal applied to said galvanometer means and adapted to direct light modulated by recorded data to a direction in which light sensitive means of the type converting light directed thereto into an electrical signal are adapted to be located, said first means being further adapted to direct light of modulated intensity which is directed thereto to a location which a light exposable medium is adapted to be located; means for providing a succession of pulses of equal durAtions, the start of each pulse being at a fixed period following the end of a preceding pulse in said succession; and galvanometer control means coupled to said galvanometer means for controlling the amplitude of the signal applied to said galvanometer means to vary substantially linearly from a first level to a second level during each of said fixed periods and for controlling the signal amplitude to vary from said second level to said first level nonlinearly during each pulse duration, whereby the mirror of said galvanometer means rotates at a substantially uniform rate from a first position to a second position during each of said fixed periods and rotates back to said first position during each pulse duration from said second position at a nonuniform rate, so that as said signal amplitude starts to increase linearly from said first level to said second level at the start of each of said fixed periods, the mirror is at said first position.

Claim 12

A facsimile system of the type including a transmitter unit wherein data on an original copy is converted into video signals transmittable to a receiver unit wherein the video signals are used to provide a facsimile of said original copy, the system comprising: a transmitter unit comprising; input means for receiving an original copy insertable therein and including a switch for sensing the leading and trailing edges of said copy; means responsive to said switch for establishing a transmit mode period extending between the times said leading and trailing edges of said copy are sensed; signal providing means for providing during said transmit mode period equal duration synchronizing pulses at a first frequency; copy drive means energizable during said transmit mode for pulling said copy through said input means whereby successive strips of said copy are exposable through a scan station of said input means; scan means responsive to each synchronizing pulse for scanning the exposed copy strip from one end thereof to an opposite end between successive synchronizing pulses and for providing video signals in response to data on said scanned strip; means including timing means and modulator means for modulating carrier signals at a first carrier frequency with said synchronizing pulses during a first interval of said transmitter mode period and for modulating carrier signals at a second carrier frequency with at least said video signals during the rest of said transmitter mode period, said timing means further including means for activating said modulating means for a second interval following said transmitter mode period to provide carrier signals at said first carrier frequency and for activating said copy drive means for a third interval following said transmitter mode period so that said copy is fully pulled by said copy drive means through said input means; and means for transmitting the output signals from said modulator means; and a receiver unit comprising; a source of modulated light; a print unit including light sensitive paper, an aperture defining a print station and paper drive means for driving paper past said print station so as to expose successive strips thereof in said print station; scan means for scanning each paper strip exposed in said print station from one end thereof to an opposite end in a direction perpendicular to the paper drive direction so as to deflect light from said source thereto; receiver means for receiving the signals transmitted to said receiver unit for defining a receiver mode period as long as carrier signals of either said first carrier frequency or said second carrier frequency are received; signal providing means for providing locally generated equal duration synchronizing pulses at said first frequency; demodulation means for demodulating said carrier signals; synchronizing means for utilizing the synchronizing pulses received during said first interval and the locally generating synchronizing pulses to contRol said signal providing means to provide said locally generated synchronizing pulses in time coincidence with the received synchronizing pulses; scan control means for controlling in response to each locally generated synchronizing pulse said scan means to scan said paper from said one end thereof to the appropriate end during the interval between synchronizing pulses; means for activating said paper drive means during at least the period carrier signals of said second carrier frequency are received; means for modulating the light of said source with the received video signals; and paper developing means for developing said light exposed paper following the period during which carrier signals of said second carrier frequency are received.

Claim 13

A facsimile system of the type including a transmitter unit wherein data on an original copy is converted into video signals transmittable to a receiver unit wherein the video signals are used to provide a facsimile of said original copy, the system comprising: a transmitter unit comprising; input means for receiving an original copy insertable therein and including a switch for sensing the leading and trailing edges of said copy; means responsive to said switch for establishing a transmit mode period extending between the times said leading and trailing edges of said copy are sensed; signal providing means for providing during said transmit mode period equal duration synchronizing pulses at a first frequency; copy drive means energizable during said transmit mode for pulling said copy through said input means whereby successive strips of said copy are exposable through a scan station of said input means; scan means responsive to each synchronizing pulse for scanning the exposed copy strip from one end thereof to an opposite end between successive synchronizing pulses and for providing video signals in response to data on said scanned strip; means including timing means and modulator means for modulating carrier signals at a first carrier frequency with said synchronizing pulses during a first interval of said transmitter mode period and for modulating carrier signals at a second carrier frequency with at least said video signals during the rest of said transmitter mode period, said timing means further including means for activating said modulating means for a second interval following said transmitter mode period to provide carrier signals at said first carrier frequency and for activating said copy drive means for a third interval following said transmitter mode period so that said copy is fully pulled by said copy drive means through said input means; and means for transmitting the output signals from said modulator means; and a receiver unit comprising; a source of modulated light; a print unit including light sensitive paper, an aperture defining a print station and paper drive means for driving paper past said print station so as to expose successive strips thereof in said print station; scan means for scanning each paper strip exposed in said print station from one end thereof to an opposite end in a direction perpendicular to the paper drive direction so as to deflect light from said source thereto; receiver means for receiving the signals transmitted to said receiver unit for defining a receiver mode period as long as carrier signals of either said first carrier frequency or said second carrier frequency are received; signal providing means for providing locally generated equal duration synchronizing pulses at said first frequency; demodulation means for demodulating said carrier signals; synchronizing means for utilizing the synchronizing pulses received during said first interval and the locally generating synchronizing pulses to contRol said signal providing means to provide said locally generated synchronizing pulses in time coincidence with the received synchronizing pulses; scan control means for controlling in response to each locally generated synchronizing pulse said scan means to scan said paper from said one end thereof to the appropriate end during the interval between synchronizing pulses; means for activating said paper drive means during at least the period carrier signals of said second carrier frequency are received; means for modulating the light of said source with the received video signals; and paper developing means for developing said light exposed paper following the period during which carrier signals of said second carrier frequency are received.

Claim 14

A facsimile system of the type described in claim 9 wherein the source of light in said receiver unit is a laser.

Claim 15

A facsimile system of the type described in claim 9 said input means of said transmitter unit include a light source of illuminating the paper strips exposed in said scan station and wherein the transmitter unit scan means comprise galvanometer means, sweep signal means and a photomultiplier, said sweep signal means being responsive to each synchronizing pulse for controlling the galvanometer means to reflect light modulated by data on the exposed copy strip to said photomultiplier which provides said video signals in response to the light intensity directed thereto.

Claim 16

A facsimile system of the type described in claim 11 wherein said galvanometer means includes a rotatable light reflecting mirror and said sweep means in response to each synchronizing pulse rotates said mirror to a first position in which light from one end of said scan station is reflected to said photomultipler, and in the period between pulses linearly rotates said mirror from said first position to a second position in which the mirror reflects light from an opposite end of said scan station to said photomultiplier.

Claim 17

A facsimile system of the type described in claim 12 wherein said light source in the transmitter unit input means is positioned on one side of said scan station and said input means further including reflecting means for enhancing the amount of light reflected by the copy strip exposed in said scan station.

Claim 18

In a facsimile system a transmitter unit comprising: a scan unit adapted to receive a data-containing copy, including means for sensing the leading and trailing edges of said copy, energizable copy drive means for pulling said copy through a scan unit so as to expose successive strips of the copy at a scan station defined in said scan unit; means for defining a transmitter mode period extending from the time the copy leading edge is sensed until the time the copy trailing edge is sensed; timing means for defining a first interval of said transmitter mode period; signal generating means for providing equal duration sychronizing pulses at a selected scan frequency during at least said first interval; converting means including scan means and video signal producing means responsive to each synchronizing pulse for scanning the exposed copy strip from one end thereof to an opposite end and to produce video signals representing the scanned data on said strip; modulator means for modulating carrier signals of a first carrier frequency with said synchronizing pulses during said first interval, and for modulating carrier signals of a second carrier frequency with at least said video signals during the rest of said transmitter mode period; and means for energizing said copy drive means during said transmitter mode period and for a selected interval following it.

Claim 19

In a facsimile system a transmitter unit comprising: a scan unit adapted to receive a data-containing copy, including means for sensing the leading and trailing edges of said copy, energizable copy drive means for pulling said copy through a scan unit so as to expose successive strips of the copy at a scan station defined in said scan unit; means for defining a transmitter mode period extending from the time the copy leading edge is sensed until the time the copy trailing edge is sensed; timing means for defining a first interval of said transmitter mode period; signal generating means for providing equal duration sychronizing pulses at a selected scan frequency during at least said first interval; converting means including scan means and video signal producing means responsive to each synchronizing pulse for scanning the exposed copy strip from one end thereof to an opposite end and to produce video signals representing the scanned data on said strip; modulator means for modulating carrier signals of a first carrier frequency with said synchronizing pulses during said first interval, and for modulating carrier signals of a second carrier frequency with at least said video signals during the rest of said transmitter mode period; and means for energizing said copy drive means during said transmitter mode period and for a selected interval following it.

Claim 20

In a facsimile system as described in claim 14 wherein said modulator means is further energizable following said transmitter mode period for a selected interval to provide unmodulated carrier signals of a selected carrier frequency.

Claim 21

In a facsimile system as described in claim 14 whereiN said scan unit includes light means for illuminating the strip of copy exposed in said scan station and said scan means include galvanometer means for scanning said strip from an end thereof to an appropriate end in response to each synchronizing pulse, so as to reflect light modulated by the data on said strip in a selected direction and said video signals producing means comprises light sensitive means for receiving the modulated light from said galvanometer means to produce said video signals in response thereto.

Claim 22

In a facsimile system as descirbed in claim 16 wherein said scan means include sweep signal generating means responsive to each synchronizing pulse for controlling said galvanometer means during the synchronizing pulse duration to reflect light from said scan station first end and for providing said galvanometer means with a sweep control signal which increases substantially linearly following the synchronizing pulse and before the start of the next synchronizing pulse so that said galvanometer means linearly scan said copy strip from the scan station first end to an opposite end.

Claim 23

In a facsimile system as described in claim 17 wherein said video signal producing means comprises a photomultiplier and said system further includes means for controlling the sensitivity of said photomultiplier during selected portions of the linearly increasing sweep control signal.

Claim 24

In a facsimile system as described in claim 18 wherein the light means in said scan unit is an elongated lamp positioned on one side of said scan station and said scan unit further includes a light reflector for enhancing the illumination of each exposed strip.

Claim 25

In a facsimile system as described in claim 17 wherein said galvanometer means comprises a galvanometer with a rotatable light reflecting mirror and said sweep signal generating means control said mirror to rotate to a first position during the duration of each synchronizing pulse and further control said mirror to rotate linearly from said first position to a second postion during each interval between synchronizing pulses.

Claim 26

In a facsimile system as described in claim 20 wherein said modulator means is further energizable following said transmitter mode period for a selected interval to provide unmodulated carrier signals of a selected carrier frequency.

Claim 27

In a facsimile system as described in claim 21 wherein the light means in said scan unit is an elongated lamp positioned on one side of said scan station and said scan unit further includes a light reflector for enhancing the illumination of each exposed strip.

Claim 28

In a facsimile system as described in claim 21 wherein said video signal producing means comprises a photomultiplier and said system further includes means for controlling the sensitivity of said photomultiplier during selected portions of the linearly increasing sweep control signal.

Claim 29

In a receiver unit of a facsimile system in which signals including video signals are received, the video signals representing data on an original copy, a facsimile of which is to be produced in said receiver unit, an arrangement comprising: input means for receiving during a first fixed period synchronizing pulses at a selected frequency and for receiving said synchronizing pulses and video signals between said synchronizing pulses during a second variable period following said first period; a print unit including a light exposable paper, paper drive means for moving said paper past a print station at which light is reflectable to expose said paper; means for energizing said paper drive means to drive said paper past said print station during at least the second period when said video signals are received; signal generating means for providing locally generated synchronizing pulses at said selected frequency; synchronizing means responsive during said first period to said received synchronizing pulses and said locally generated synchronizing pulses for controlling said sigNal generating means to provide said locally generated pulses in synchronism with said received synchronizing pulses; light source means responsive to said video signals for providing a beam of light modulated thereby; scan means responsive to said locally generated synchronizing signals for exposing the paper passing said print station from one end thereof to an appropriate end with the modulated light from said light source means during the intervals between successive synchronizing pulses; and means for controlling the unmodulated intensity of the beam of light from said light source means during the duration of each synchronizing pulse received during said second period.

Claim 30

In a receiver unit of a facsimile system in which signals including video signals are received, the video signals representing data on an original copy, a facsimile of which is to be produced in said receiver unit, an arrangement comprising: input means for receiving during a first fixed period synchronizing pulses at a selected frequency and for receiving said synchronizing pulses and video signals between said synchronizing pulses during a second variable period following said first period; a print unit including a light exposable paper, paper drive means for moving said paper past a print station at which light is reflectable to expose said paper; means for energizing said paper drive means to drive said paper past said print station during at least the second period when said video signals are received; signal generating means for providing locally generated synchronizing pulses at said selected frequency; synchronizing means responsive during said first period to said received synchronizing pulses and said locally generated synchronizing pulses for controlling said sigNal generating means to provide said locally generated pulses in synchronism with said received synchronizing pulses; light source means responsive to said video signals for providing a beam of light modulated thereby; scan means responsive to said locally generated synchronizing signals for exposing the paper passing said print station from one end thereof to an appropriate end with the modulated light from said light source means during the intervals between successive synchronizing pulses; and means for controlling the unmodulated intensity of the beam of light from said light source means during the duration of each synchronizing pulse received during said second period.

Claim 31

In a receiver unit of a facsimile system as described in claim 24 wherein said locally generated synchronizing pulses are of equal durations and said scan means includes a galvanometer having a rotatable light reflecting mirror and sweep means responsive to each synchronizing pulse for rotating the mirror during the duration of each synchronizing pulse to a first position whereby light from said source is reflected by the mirror to one end of said print station and for linearly rotating the mirror during the interval between successive synchronizing pulses, from said first position toward a second position in which light from the mirror is reflected to an opposite end of said print station thereby exposing paper passing through said print station with modulated light as said mirror rotates from said first position to the second position.

Claim 32

In a receiver unit of a facsimile system as described in claim 24 further including means for developing said light exposed paper only after it is exposed by light modulated by all the video signals received during said second period.

Claim 33

In a receiver unit of a facsimile system as described in claim 26 wherein said light source means is a laser.

Claim 34

In a receiver unit of a facsimile system in which signals including video signals are received, the video signals representing data on an original copy, a facsimile of which is to be produced in said receiver unit, an arrangement comprising: input means for receiving during a first fixed period synchronizing pulses at a selected frequency and for receiving synchronizing pulses and video signals between said synchronizing pulses during a second variable period following said first period; a print unit including a light exposable paper, paper drive means for moving said paper past a print station at which light is reflectable to expose said paper; means for energizing said paper drive means to drive said paper past said print station during at least the second period wehn said video signals are received; signal generating means for providing locally generated synchronizing pulses at said selected frequency; synchronizing means responsive during said first period to said received synchronizing pulses and said locally generated synchronizing pulses for controlling said signal generating means to provide said locally generated pulses in synchronism with said received synchronizing pulses; a laser responsive to said video signals for providing a beam of light modulated thereby; scan means responsive to said locally generated synchronizing signals for exposing the paper passing said print station from one end thereof to an appropriate end with the modulated light from said light source means during the intervals between successive synchronizing pulses; and means for utilizing the synchronizing pulses received during said second period to control the laser''s unmodulated beam intensity.

Claim 35

In a receiver unit of a facsimile system in which signals including video signals are received, the video signals representing data on an original copy, a facsimile of which is to be produced in said receiver unit, an arrangement comprising: input means for receiving during a first fixed period synchronizing pulses at a selected frequency and for receiving synchronizing pulses and video signals between said synchronizing pulses during a second variable period following said first period; a print unit including a light exposable paper, paper drive means for moving said paper past a print station at which light is reflectable to expose said paper; means for energizing said paper drive means to drive said paper past said print station during at least the second period wehn said video signals are received; signal generating means for providing locally generated synchronizing pulses at said selected frequency; synchronizing means responsive during said first period to said received synchronizing pulses and said locally generated synchronizing pulses for controlling said signal generating means to provide said locally generated pulses in synchronism with said received synchronizing pulses; a laser responsive to said video signals for providing a beam of light modulated thereby; scan means responsive to said locally generated synchronizing signals for exposing the paper passing said print station from one end thereof to an appropriate end with the modulated light from said light source means during the intervals between successive synchronizing pulses; and means for utilizing the synchronizing pulses received during said second period to control the laser''s unmodulated beam intensity.

Claim 36

In a receiver unit of a facsimile system in which signals including video signals are received, the video signals representing data on an original copy, a facsimile of which is to be produced in said receiver unit, an arrangement comprising: input means for receiving during a first fixed period synchronizing pulses at a selected frequency and for receiving video sIgnals during a second variable period following said first period; a print unit including a roll of light exposable paper, paper drive means for moving the leading portion of said paper roll past a print station at which light is reflectable to expose said paper; means for energizing said paper drive means to drive said paper past said print station during at least the second period when said video signals are received; signal generating means for providing locally generated synchronizing pulses at said selected frequency; synchronizing means responsive during said first period to said received synchronizing pulses and said locally generated synchronizing pulses for controlling said signal generating means to provide said locally generated pulses in synchronism with said received synchronizing pulses; light source means responsive to said video signals for providing a beam of light modulated thereby; and scan means responsive to said locally generated synchronizing signals for exposing the paper passing said print station from one end thereof to an appropriate end with the modulated light from said light source means during the intervals between successive synchronizing pulses; cutting means for severing the portion of the paper exposed to said light from the rest of said roll after at least said second period; and developing means for developing the paper which was exposed to said light, only after it was severed by said severing means.

Claim 37

In a receiver unit of a facsimile system in which signals including video signals are received, the video signals representing data on an original copy, a facsimile of which is to be produced in said receiver unit, an arrangement comprising: input means for receiving during a first fixed period synchronizing pulses at a selected frequency and for receiving video sIgnals during a second variable period following said first period; a print unit including a roll of light exposable paper, paper drive means for moving the leading portion of said paper roll past a print station at which light is reflectable to expose said paper; means for energizing said paper drive means to drive said paper past said print station during at least the second period when said video signals are received; signal generating means for providing locally generated synchronizing pulses at said selected frequency; synchronizing means responsive during said first period to said received synchronizing pulses and said locally generated synchronizing pulses for controlling said signal generating means to provide said locally generated pulses in synchronism with said received synchronizing pulses; light source means responsive to said video signals for providing a beam of light modulated thereby; and scan means responsive to said locally generated synchronizing signals for exposing the paper passing said print station from one end thereof to an appropriate end with the modulated light from said light source means during the intervals between successive synchronizing pulses; cutting means for severing the portion of the paper exposed to said light from the rest of said roll after at least said second period; and developing means for developing the paper which was exposed to said light, only after it was severed by said severing means.

Claim 38

In a receiver unit of a facsimile system as described in claim 29 wherein said locally generated synchronizing pulses are of equal duration and said scan means include a galvanometer having a rotatable light reflecting mirror and sweep means responsive to each synchronizing pulse for rotating the mirror during the duration of each synchronizing pulse to a first position whereby light from said source is reflected by the mirror to one end of said print station and for linearly rotating the mirror from said first position toward a second position in which light from the mirror is reflected to an opposite end of said print station thereby exposing paper passing through said print station with modulated light as said mirror rotates from said first position to the second position.

Claim 39

In a receiver unit of a facsimile system as described in claim 30 wherein said light source means is a laser.

Claim 40

In a receiver unit of a facsimile system as described in claim 31 wherein said synchronizing pulses are received during said second period with video signals being received between synchronizing pulses and means for utilizing the synchronizing pulses received during said second period to control the laser''s unmodulated beam intensity.

Claim 41

In a receiver unit of the type in which carrier signals of a first frequency are received during a variable length period, at least some of said carrier signals being modulated by video signals representing data for producing a readable paper copy containing said data, said variable length period being substantially equal to the period requiring for a copy containing said data to pass through a sensor in a transmit unit from which said carrier signals are received, an arrangement comprising: a print unit defining a print station and including a roll of energy sensitive paper and a paper drive motor for driving paper extending from said roll past said print station; means for energizing said paper drive motor to drive said paper past said print station during said variable length period; means including energy source means responsive to said video signals for directing energy modulated by said video signals to said print station to sensitize said paper; cut means for severing the paper which passed said print station from said roll at the end of said variable length period; and development means for developing the energy sensitized paper only after said paper was severed from said roll.

Claim 42

In a receiver unit of the type in which carrier signals of a first frequency are received during a variable length period, at least some of said carrier signals being modulated by video signals representing data for producing a readable paper copy containing said data, said variable length period being substantially equal to the period requiring for a copy containing said data to pass through a sensor in a transmit unit from which said carrier signals are received, an arrangement comprising: a print unit defining a print station and including a roll of energy sensitive paper and a paper drive motor for driving paper extending from said roll past said print station; means for energizing said paper drive motor to drive said paper past said print station during said variable length period; means including energy source means responsive to said video signals for directing energy modulated by said video signals to said print station to sensitize said paper; cut means for severing the paper which passed said print station from said roll at the end of said variable length period; and development means for developing the energy sensitized paper only after said paper was severed from said roll.

Claim 43

In a receiver unit as described in claIm 33 wherein said development means include drive means for driving the severed paper through said development means at a rate which is independent of the rate at which the paper is driven past said print station.

Claim 44

In a receiver unit as described in claim 34 further including means disposed between said cut means and said development means for inhibiting the paper from extending to said drive means of said development means, during said variable length period and for extending said severed paper to said drive means of said development means after said paper was severed from said roll.

Claim 45

In a receiver unit as described in claim 35 further including loop forming means including a moving member for enabling the paper passing through said print station to reach said inhibiting means and for shaping the paper inhibited by said inhibiting means from extending to the drive means of said development means to form a loop therein, with said moving member moving from a fixed position to enable said loop to be formed.

Claim 46

In a receiver unit as described in claim 36 wherein said energy is light.