Image information electrostatic recording device

An image information recording device which comprises in combination:

• a. an He-Ne gas laser oscillator for generating a laser beam modulated by an image information signal;
• b. a photosensitive body consisting essentially of an insulative layer, a photoconductive layer, and an electrically conductive substrate, said photoconductive layer comprising cadmium sulfide (CdS);
• c. deflection means to cause said laser beam to scan on said photosensitive body;
• d. optical means to focus said modulated and deflected laser beam on said photosensitive body;
• e. means to input said image information signal to said laser oscillator in synchronism with said deflection means;
• f. means for uniformly applying a first charge to said photosensitive body;
• and
• g. means for imparting a second charge to said photosensitive body immediately before scanning said photosensitive body with said modulated and deflected laser beam, wherein a high contrast electrostatic latent image is formed upon application of the modulated beam to the photosensitive body.

An image information recording device which comprises in combination:

• a. an He-Ne gas laser oscillator for generating a laser beam modulated by an image information signal;
• b. a photosensitive body consisting essentially of an insulative layer, a photoconductive layer, and an electrically conductive substrate, said photoconductive layer comprising cadmium sulfide (CdS);
• c. deflection means to cause said laser beam to scan on said photosensitive body;
• d. optical means to focus said modulated and deflected laser beam on said photosensitive body;
• e. means to input said image information signal to said laser oscillator in synchronism with said deflection means;
• f. means for uniformly applying a first charge to said photosensitive body;
• g. means for imparting a second charge to said photosensitive body immediately after scanning said photosensitive body with said modulated and deflected laser beam to form an image pattern;
• and
• h. means to effect overall exposure of said photosensitive body after the application of the second charge to form a high contrast electrostatic latent image.

An image information recording device which comprises in combination:

• a. an He-Ne gas laser oscillator for generating a laser beam modulated by an image information signal;
• b. a photosensitive body consisting essentially of an insulating layer, a photoconductive layer and an electrically conductive substrate, said photoconductive layer comprising cadmium sulfide (CdS);
• c. deflection means to cause said laser beam to scan on said photosensitive body;
• d. optical means to focus said modulated and deflected laser beam on said photosensitive body, said optical means including a scanning lens between the photosensitive body and the deflection means having a focal length f that conforms to the relationship r=f.multidot..theta., where .theta. is the angle between the light beam and an optical axis of the lens, and r is the length between the optical axis and focusing position on the photosensitive body, whereby the laser beam scans the photosensitive body at a constant linear velocity with constant focusing;
• e. means to input said image information signal to said laser oscillator in synchronism with said deflection means;
• f. means for uniformly applying a first charge to said photosensitive body;
• g. means for imparting a second charge to said photosensitive body simultaneously with scanning said photosensitive body with said modulated and deflected laser beam to form an image pattern;
• h. means to effect overall exposure of said photosensitive body after the simultaneous application of the second charge and said modulated beam to form a high contrast electrostatic latent image;
• and
• i. a position detection means for detecting the laser beam position in order to set the position for the scanning laser beam to commence scanning on said photosensitive body, said input means being controlled by said position detecting means.

An image information recording device which comprises in combination:

• a. an He-Ne gas laser oscillator for generating a laser beam modulated by an image information signal;
• b. a photosensitive body consisting essentially of an insulating layer, a photoconductive layer, and an electrically conductive substrate, said photoconductive layer comprising cadmium sulfide (CdS);
• c. deflection means to cause said laser beam to scan on said photosensitive body;
• d. optical means to focus said modulated and deflected laser beam on said photosensitive body;
• e. means to input said image information signal to said laser oscillator in synchronism with said deflection means;
• f. means to electrically charge said photosensitive body;
• g. corona discharge means for imparting alternating or direct current corona discharge to said photosensitive body simultaneously with scanning said photosensitive body with said modulated and deflected laser beam to form an image pattern;
• h. means to effect overall exposure of said photosensitive body after the simultaneous application of the corona discharge and said modulated beam to said photosensitive body to form an electrostatic latent image;
• i. means to develop a formed electrostatic latent image;
• j. means to transfer said developed image onto an image transfer material;
• k. means to clean said photosensitive body;
• and
• l. means to fix the transferred image.

An image information recording device which comprises in combination:

• a. means to generate a laser beam modulated by an image information signal;
• b. a photosensitive body consisting essentially of an insulating layer, a photoconductive layer and an electrically conductive substrate;
• c. deflection means to cause said laser beam to scan on said photosensitive body;
• d. optical means to focus said modulated and deflected laser beam on said photosensitive body;
• e. means to input said image information signal to said generating means in synchronism with said deflection means;
• f. means to electrically charge said photosensitive body;
• g. corona discharge means for imparting alternating current corona discharge to said photosensitive body simultaneously with scanning said photosensitive body with said modulated and deflected laser beam, said corona discharge means effecting alternating current corona discharge in the frequency of f.gtoreq.V/P Hz, where V is the relative speed (cm/sec.) between said photosensitive body and said laser beam, and P is a constant for the device which represents the allowable pitch (cm.) due to the A.C. corona discharge frequency on said photosensitive body;
• and
• h. means to effect overall exposure to said photosensitive body after the simultaneous application of corona discharge and said modulated beam to said photosensitive body to form a high contrast electrostatic latent image.

An image information recording device which comprises in combination:

• a. means to generate a laser beam modulated by an image information signal;
• b. a photosensitive body having an insulating layer, a photoconductive layer whose spectral sensitivity matches with said laser beam, and an electrically conductive substrate;
• c. deflection means including a polygonal mirror or a galvano-mirror to cause said laser beam to scan said photosensitive body;
• d. optical means to focus said laser beam on the photosensitive body, said optical means including f-.theta. lens which is a lens having a focal length f that conforms to relationship of r=f.multidot..theta., where .theta. is the angle between the laser beam and an optical axis of the lens, and r is the length between the optical axis and focusing position on the photosensitive body;
• e. a position detection means to set a position for the laser beam to commence scanning on said photosensitive body;
• f. means to input said image information signal to said generating means in synchronism with said deflection means by means of an output signal from said position detection means;
• g. means to electrically charge said photosensitive body;
• h. corona discharge means for imparting alternating current corona discharge in the frequency of f.gtoreq.V/P, where V is relative speed (cm/sec.) between said photosensitive body and said light beam, and P is a constant for the device which represents the allowable pitch (cm.) due to the A.C. corona discharge frequency on said photosensitive body, simultaneously with the scanning of said light beam as modulated and deflected on said photosensitive body;
• i. means to effect overall exposure to said photosensitive body;
• j. means to develop a formed electrostatic latent image;
• k. means to transfer the developed image to a transfer material;
• l. means to fix the transferred image;
• and
• m. means to clean said photosensitive body.

A laser recording device which comprises in combination:

• a. a semiconductor laser oscillator for forming a modulated laser beam;
• b. a photosensitive body consisting essentially of an insulating layer, a photoconductive layer, and an electrically conductive substrate;
• c. deflection means to cause said modulated laser beam to scan said photosensitive body;
• d. optical means to focus said modulated and deflected laser beam on said photosensitive body;
• e. means to input an image information signal to said oscillator in synchronism with said deflection means;
• f. means to electrically charge said photosensitive body;
• g. corona discharge means for imparting alternating current corona discharge to said photosensitive body simultaneously with the scanning of said photosensitive body with said modulated and deflected laser beam, said corona discharge means effecting alternating current corona discharge in the frequency of f.gtoreq.V/P Hz, where V is the relative speed (cm/sec.) between said photosensitive body and said laser beam, and P is a constant for the device which represents the allowable pitch (cm.) due to the A.C. corona discharge frequency on said photosensitive body;
• and
• h. means to effect overall exposure of said photosensitive body after the simultaneous application of the corona discharge and the modulated beam on said photosensitive body to form a high contrast electrostatic latent image.

An information recording device comprising in combination:

• means for generating an information signal;
• means for generating an He-Ne gas laser beam modulated in accordance with the information signal;
• a recording medium sensitive to the laser beam, said recording medium consisting essentially of an insulating layer, a photoconductive layer containing CdS powder and an electrically conductive substrate;
• an interface circuit for inputting the information signal, and for generating an instruction signal;
• a data memory for storing a predetermined amount of information data input by said interface circuit;
• an instruction circuit for receiving the instruction signal from said interface circuit;
• a character generator for generating character data;
• a data generator for producing data to scan said recording medium in accordance with information to be recorded thereon, said data generator being connected with said data memory, said instruction circuit and said character generator to receive signals therefrom;
• buffer means for temporarily storing the signal from said data generator;
• generator control means for producing a signal to actuate said generating means in accordance with a signal read out of said buffer means;
• means for causing the laser beam thus modulated to scan said recording medium;
• and
• means for forming on said recording medium an electrostatic image in accordance with the thus modulated laser beam.

A data recording device comprising in combination:

• a recording medium sensitive to a laser beam;
• means for forming a laser beam modulated in accordance with data to be recorded on said recording medium;
• means for causing the modulated laser beam to scan said recording medium;
• means for producing data for modulating the laser beam;
• means for storing a predetermined amount of the data produced by said modulating data producing means in accordance with a scanning operation;
• means for driving said modulator means in accordance with the modulating data;
• means for detecting when the laser beam is at a particular position;
• means for controlling said driving means in response to said detecting means;
• means to electrically charge said recording medium;
• and
• corona discharge means for imparting alternating current corona discharge to said recording medium simultaneously with scanning said recording medium with said modulated laser beam, said corona discharge means effecting alternating current corona discharge in the frequency of f.gtoreq.V/P Hz, where V is the relative speed (cm/sec.) between said photosensitive body and said laser beam, and P is a constant for the device which represents the allowable pitch (cm.) due to the A.C. corona discharge frequency on said recording medium.

An image information recording device which comprises in combination:

• a. a photosensitive body including an insulating layer, a photoconductor layer, and an electrically conductive substrate, said photoconductive layer comprising cadmium sulfide (cds);
• b. means to apply a first charge to said photosensitive body;
• c. means to form a modulated beam of electro-magnetic radiation in accordance with an information signal, wherein the modulated beam is a coherent beam having a wavelength of 450 m.mu.-700 m.mu. to which said photoconductive layer has substantial spectral sensitivity;
• d. deflection means to cause the modulated beam to scan said photosensitive body;
• e. means to impart a second charge to said photosensitive body for forming an image pattern;
• and
• f. means to effect overall exposure of said photosensitive body after said photosensitive body has been scanned and subjected to the second charge to thereby form a high contrast image on the surface of said insulating layer.

An image information recording device which comprises in combination:

• a. a photosensitive body;
• b. means to form a beam of electro-magnetic radiation modulated in accordance with image information;
• c. scanning means to cause the modulated beam to scan said photosensitive body;
• d. means to form an electrostatic image on said photosensitive body in accordance with the modulated beam scanning said photosensitive body, said electrostatic image forming means including a corona discharger for imparting alternating current corona discharge to said photosensitive body simultaneously with the scanning of said photosensitive body with the modulated beam, said corona discharger being supplied with an alternating current power source having a frequency which prevents the alternating current corona from causing a non-uniform potential of the electrostatic image which would result in a non-uniform developed image;
• and
• e. means to develop the electrostatic image with a developer.

An image information recording device which comprises in combination:

• a. a laser oscillator for forming a modulated laser beam;
• b. a photosensitive body including an insulating layer, a photoconductive layer, and an electrically conductive substrate, said photoconductive layer comprising cadmium sulfide CdS);
• c. scanning means to cause the modulated laser beam to scan said photosensitive body;
• d. optical means to focus the modulated laser beam on said photosensitive body;
• e. means to input an image information signal to said oscillator;
• f. means to electrically charge said photosensitive body;
• g. corona discharge means to impart alternating current corona discharge to said photosensitive body simultaneously with the scanning of said photosensitive body with the modulated laser beam;
• h. means to effect overall exposure of said photosensitive body after said photosensitive body has been scanned and subjected to the corona discharge to form a high contrast electrostatic latent image;
• and
• i. means to develop the formed electrostatic latent image with developer which is retained on the surface portions of said photosensitive body subjected to the modulated laser beam.

An image information recording device which comprises in combination:

• a. a laser oscillator for forming a modulated laser beam;
• b. a photosensitive body including an insulating layer, a photoconductive layer, and an electrically conductive substrate, said photoconductive layer comprising cadmium sulfide (CdS);
• c. scanning means to cause the modulated laser beam to scan said photosensitive body;
• d. optical means to focus the modulated laser beam on said photosensitive body;
• e. means to input an image information signal to said oscillator;
• f. means to uniformly apply a first charge to said photosensitive body;
• g. means to impart a second charge to said photosensitive body immediately before scanning said photosensitive body with the modulated laser beam to form a high contrast electrostatic latent image;
• and
• h. means to develop the formed electrostatic latent image with developer which is retained on the surface portions of said photosensitive body subjected to the modulated laser beam.

An image information recording device which comprises in combination:

• a. a laser oscillator for forming a modulated laser beam;
• b. a photosensitive body including an insulating layer, a photoconductive layer, and an electrically conductive substrate, said photoconductive layer comprising cadmium sulfide (CdS);
• c. scanning means to cause the modulated laser beam to scan said photosensitive body;
• d. optical means to focus the modulated laser beam on said photosensitive body;
• e. means to input an image information signal to said oscillator;
• f. means to uniformly apply a first charge to said photosensitive body;
• g. means to impart a second charge to said photosensitive body immediately after scanning said photosensitive body with the modulated laser beam to form an image pattern;
• h. means to effect overall exposure of said photosensitive body after said photosensitive body has been subjected to the second charge to form a high contrast electrostatic latent image, and
• i. means to develop the formed electrostatic latent image with developer which is retained on the surface portions of the photosensitive body subjected to the modulated laser beam.

An image information recording device which comprises in combination:

• a. a photosensitive body including an insulating layer, a photoconductive layer, and an electrically conductive substrate;
• b. means to form a beam of electro-magnetic radiation of a diameter modulated by an image information signal;
• c. scanning means to cause the modulated beam to scan said photosensitive body to project dots of a predetermined diameter onto said photosensitive body.
• d. beam diameter control means disposed between said beam forming means and said photosensitive body, to alter the diameter of the beam formed by said beam forming means before it impinges on said photosensitive body;
• e. charging means to uniformly apply a first charge to a surface of the insulating layer;
• f. corona discharge means to apply a second charge to the surface of the insulating layer of the photosensitive body, and to allow the modulated beam to reach the photosensitive body therethrough and thereby form an image pattern;
• g. means to effect overall exposure of said photosensitive body after the application of the second charge and the modulated beam to said photosensitive body, to form an electrostatic image in accordance with the dots formed by the incident beam;
• and
• h. means to develop the electrostatic image with a developer.

An image information recording device which comprises in combination:

• a. means to form a beam electro-magnetic radiation modulated in accordance with an information signal;
• b. a recording medium;
• c. first deflecting means to cause the modulated beam to scan said recording medium in a main scanning direction of said recording medium;
• d. second deflecting means to deflect the modulated beam in a subordinate direction perpendicular to the main scanning direction;
• e. means to temporarily store information signals;
• f. first means to read out data from said storing means so as to extend, in accordance with a predetermined image magnification, the time period during which one modulation signal is utilized for modulation along the main scanning direction;
• g. second means to read out one modulation signal repeatedly from said storing means so as to modulate, with the one modulation signal, the number of beams corresponding to the image magnification in the subordinate scanning direction;
• h. modulation control means to cause modulation in said beam forming means in accordance with the signals read out of said first and second read out means;
• and
• i. means to form an electrostatic image in accordance with the modulated beam scanning said recording medium.