JPS63208071A - Printer - Google Patents

Abstract

PURPOSE:To simplify construction as compared to apparatus using a laser beam and LED beam as an exposing means by projecting an electron beam to a surface charged with static electricity or fluorescent surface to form an image. CONSTITUTION:An image forming part G consists of an electron tube 1 which radiates the electron beam 2, an electron gun 4 which focuses and emits the electron beam 2, and a deflector 5 which scans the electron beam 2 two- dimensionally on a photosensitive drum 3. The variations in intensity corresponding to an image signal are, therefore, applied to the electron beam 2 to be radiated from the electron tube 1 by the electron gun 4 and such beam is concentrated and emitted from the gun. The electron beam 2 is then two-dimensionally scanned on the drum 3 by the deflector 5 to erase part of the surface charge on the drum 3 by which the charge latent image is formed. The low-cost printer is thereby obtd. and since the image formation is executed by scanning the electron beam, the high-speed printing is realized.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a printer device.

[Conventional technology]

Various printer devices have been developed as information devices, and 17-zer printers in particular are models capable of high print quality and high speed printing, and are therefore considered to become the mainstream of printers in the future.

[Problem that the invention seeks to solve]

By the way, a laser printer guides a laser beam from a laser oscillator through a beam compressor, an AO modulator, a beam extender, and a cylindrical lens to a rotating polygon mirror, and as the rotating polygon mirror rotates, the laser beam passes through a toroidal lens and an fθ lens. Through this, static electricity is scanned over the charged circumferential surface of the photosensitive drum, thereby forming an image on the photosensitive drum. As mentioned above, conventional laser printers have complex image forming parts, and because images are formed using light beams, dirt in the optical path can affect print quality, so careful maintenance is required. In addition, it is necessary to use high-quality equipment that does not cause light diffraction in the optical path, which has the disadvantage of increasing the price.

An object of the present invention is to provide a printer device that solves the above problems.

[Means for solving problems]

The present invention is a printer device characterized by being equipped with an image forming section that forms an image by irradiating an electrostatically charged surface or a fluorescent screen with an electron beam.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows a first embodiment of the present invention, and shows an example in which the present invention is applied to an electrophotographic printer.

In FIG. 1, the electrophotographic printer includes a charging section and an image forming section G along the circumference of a photosensitive drum 3.

A process section P consisting of a developing section, a transfer section, a fixing section, and a cleaning section is provided, and the charging section charges the surface of the photosensitive drum 3 with static electricity, and then the image forming section G charges some of the surface charge on the photosensitive drum. A charge latent image is formed by disappearing the charge latent image along with the image data, a developing section attaches toner to the charge latent image and developing it into a visible image, a transfer section transfers the toner image to paper, and a fixing section transfers the toner image to paper. The transferred toner image is fixed on the transfer paper by heating or other methods, and finally, a cleaning section removes toner and electric charge remaining on the surface of the photosensitive drum 3, erases the previous history, and ends the process.

The image forming unit G according to this embodiment includes an electron tube 1 that emits an electron beam 2, an electron gun 4 that focuses and emits the electron beam 2, and a two-dimensional scan of the electron beam 2 onto a photosensitive drum 3. It consists of a deflector 5.

Therefore, by applying intensity changes to the electron beam emitted from the electron tube 1 by the electron gun 4 and emitting it in a concentrated manner, the electron beam 2 is caused to scan the photosensitive drum 3 two-dimensionally by the deflector 5. A part of the surface charge on the photosensitive drum 3 is erased along with the image data to form a charge latent image. The subsequent process is the same as before to complete printing.

(Embodiment 2) FIG. 2 shows a second embodiment of the present invention. Second
In the figure, the image forming section G according to this embodiment is composed of a cathode ray tube 6. This cathode ray tube 6 is an electron tube used for displaying images in televisions, etc. It includes an electron gun that changes the strength of the electron beam emitted from the cathode of the tube body in accordance with the image signal and emits it in a concentrated manner, and an electron gun that emits the electron beam in a two-dimensional manner. It consists of a deflector that scans the electron beam and a fluorescent film that emits light when the electron beam collides with it, and these are integrated into a vacuum container. In this embodiment, the fluorescent film of the cathode ray tube 6 is made to emit light to display an image, and the paper 7 whose surface is charged with static electricity is brought close to the cathode ray tube 6, and a part of the surface charge on the paper 7 disappears to form a charge latent image. do. The subsequent process is carried out in the same manner as in the first embodiment. According to this embodiment, since the cathode ray tube 6 used for displaying images on televisions and the like and which can be manufactured in large quantities is used, it can be used to reduce costs. Since the cathode ray tube 6 has a screen scanning capacity of 1/30th of a second, high-speed printing and screen copying for VTRs and the like have the same resolution as the screen, and furthermore, photographic paper can be used as the paper 7. Color printing is possible.

〔Effect of the invention〕

As explained above, the present invention forms an image by irradiating an electrostatically charged surface or a fluorescent screen with an electron beam.
Compared to devices that use laser beams or LED beams as exposure means, the structure can be reduced to ff1li, and since low-cost electron tubes that can be mass-produced are used, a low-cost printer can be provided.

Furthermore, since image formation is performed by scanning an electron beam, high-speed printing can be achieved without reducing printing speed. Furthermore, by using a cathode ray tube as the electron tube, high-resolution, high-speed copying and color printing can be performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the present invention, and FIG. 2 is a block diagram showing a second embodiment of the present invention. 1... Electron tube 2... Electron beam 3.
...Photosensitive drum 4...Electron gun 5...Deflector 6...Cathode ray tube 7...Paper

Claims (1)

[Claims] (1) A printer device characterized in that it is equipped with an image forming section that forms an image by irradiating an electrostatically charged surface or a fluorescent screen with an electron beam.