摘要:
An electrostatic image recording device in which an image is projected by an optical projecting system upon a charged, supported electrophotographic member to form a latent image on the photoconductive surface thereof. A container of toner in liquid suspension is provided with a spongelike member interior thereof and which has a relatively rigid foraminous wall, the remaining walls being flexible. The container and the supporting structure are moved one relative the other with the foraminous wall proximate the surface carrying the latent image and the toner suspension is pumped onto the said surface flooding same. The pumping is performed by temporarily collapsing the flexible said walls of the container with excess toner sucked up by return of the container to its normal condition.The supporting structure for the electrophotographic member has a part framing the photoconductive surface which carries the latent image and the container has a border framing the foraminous surface, engagement of border and framing part defining a liquid tight chamber for receiving and retaining the toner suspension to assure flooding and proper removal of excess toner upon return of the container to its normal condition.
摘要:
An electrostatic imaging method wherein the photoconductive coating of an electrophotograhic film is charged simultaneously with its exposure to a scene to be recorded, the charging step ceasing when a level of charge has been reached which is optimum for the light condition of the scene and with toning being commenced immediately subsequent to the cessation of the charging. Light from the scene is cut off immediately prior to commencement of toning. The film utilized is capable of accepting a charge at a rate faster than the light of a scene to be recorded discharges the film.The method is preferably practiced utilizing a camera which includes projecting means for prjecting a scene onto the film, a corona generating system, a toning system, means for measuring the light coming through the projector, means for measuring the surface potential of a dark area of the flm while it is being charged and an electronic control circuit which operates the charging system in response to the measured light.
摘要:
Composite materials that can be used to block radiation of a selected wavelength range or provide highly pure colors are disclosed. The materials include dispersions of metal particles that exhibit optical resonance behavior, presenting to the selected radiation absorption cross-sections that substantially exceed the particles' geometric cross-sections. The particles are preferably manufactured as uniform nanosize spheres, and dispersed evenly within a carrier material having compatible dielectric characteristics. The large absorption cross-sections ensure that a relatively small volume of particles will render the composite material fully opaque (or nearly so) to incident radiation of the resonance wavelength, blocking harmful radiation or producing highly pure colors. The durability of the particles themselves ensure resistance to mechanical wear forces and the bleaching effects of intense radiation (e.g., sunlight).
摘要:
A printing ink comprises a clear, transparent, polymeric carrier material and uniform, colloidal size charged color particles evenly dispersed therein. The carrier and the particles are adhesively bonded to one another so as to form a matrix which can collectively respond to an externally imposed electrostatic field to promote co-movement of a "bite" of ink to an imaging medium without change of the bulk particle/carrier ratio. During the printing process, the ink is melted and exposed to electrostatically charged latent image areas on a heated image cylinder, resulting in the transfer of the ink thereto in proportion to the electrostatic field strength. The ink exhibits a relatively sharp liquid-to-solid transition, thereby enabling rapid ink solidification and complete transfer from the imaging medium to the relatively cool printing substrate. Also disclosed is a printing method and apparatus that facilitate continuous, variable and on-demand color printing in conjunction with the ink. Use of essentially monodispersed, color-coated, colloidal size, spherical particles in the ink results in excellent color purity and chromaticity range.
摘要:
Radiation-absorptive materials, suitable for fabrication into packages, sheets, inks, paints, decorative surface treatments, lotions, creams, and gels are disclosed. The materials exploit certain optical properties associated with uniform, spherical, nanosize particles to provide complete radiation absorption, over a selected bandwidth, at low concentration. One type of particle exhibits an "absorption edge" at a chosen wavelength, transmitting radiation whose wavelength exceeds the characteristic bandgap wavelength, while effectively absorbing all radiation with wavelengths smaller than that minimum. Another type of particle exhibits "optical resonance," which causes radiation of a characteristic wavelength to interact with the particles so as to produce self-reinforcing internal reflections that strongly enhance the amplitude of the radiation trapped within the particle.
摘要:
A method of making synthetic color pigments comprises synthesizing monodispersed colloidal core particles by precipitation from a solution and applying dye material to the core particles either by adsorption directly into the core particles or by adsorption or incorporation into alumina fixation shells at the surfaces of the core particles. Additional functional shells may be applied to the dyed core particles for various reasons. The pigments are useful for the coloration of various media such as printing inks and paint compositions.
摘要:
Transparent, refractory coatings and methods for their application to environmentally exposed substrates are disclosed. The coatings can be deposited over organic decorative materials, which generally prevent application of hard, protective, inorganic materials due to emission of exudates and vulnerability to excessive heat. The coatings are applied using plasma-enhanced chemical-vapor deposition techniques that reduce reaction temperatures and produce multilayer structures that seal organic exudates before a final layer of coating is applied, such multilayer protective coating structures being particularly suitable for protecting automobile bodies and the like against degrading external forces.
摘要:
A large thin web having a coherent crystal morphology throughout its extent is made on a continuous basis by drawing a meniscus of the web material from a hot melt thereof onto a heated support surface which moves relative to the melt so that the liquid is distributed as a thin liquid film over that support surface. The moving support surface advances the film progressively past a chiller which establishes a chill zone at the surface of the film which cools the film material at an isothermal front or boundary therein to a temperature below the melting point of the material so that the material solidifies. Also, a crystal seeding bar is located at the chill zone which is brought into contact with the film just ahead of the front so that when the film solidifies in the chill zone it assumes the crystal morphology of the seeding bar. The solidified film that is peeled from the support surface constitutes the finished web, while new material drawn from the melt is added to the support surface upstream from the chill zone so that the process is continuous. Apparatus for controlling the process are also disclosed, as are various articles and structures made from such webs. Also disclosed are means for depositing additional layers of material on the web while preserving a compatible crystal morphology throughout the entire plural-layer structure.
摘要:
An electronic read/write or microscope-camera system which can receive and store very low energy optical and equivalent electronic signals on a special optoelectronic tape or medium as varying charge density distributions over the imaged frame. Images are retrieved from the tape or medium by scanning the tape or medium with a focused electron beam which causes the tape or medium to emit secondary electrons as a charge density modulated return beam current. The electrons in the return beam are collected and amplified to develop an electrical signal representative of the image stored on the tape or medium. A method of applying images to and retrieving them from the tape or medium is also disclosed.
摘要:
An apparatus and method for making copies of an original pattern through the use of electrostatic techniques in which there is a looped belt having an exterior photoconductive layer. The exterior of the belt passes through a charging station and is imaged by a projected pattern of light thereafter in darkness to acquire a latent image progressively as the belt moves in one direction. The belt passes a toning station where a toning roller dipping into a sump of toner picks up toner particulate matter and rolls the toner matter onto the latent image to develop the same as the belt passes through the toning station. The toning roller engages the belt and protrudes into the loop formed by the belt thereby requiring the belt to be wrapped around a peripheral segment of the toning roller. There is a stretched portion of the belt extending between the peripheral segment and each of a pair of guide rollers so that the toning roller is restrained only by the tension of the belt.