KR900000609B1 - Injection device of printer using crt - Google Patents

Abstract

The scanner includes an electron gun (EG) depositing the inner sides of glass plates (20,21) for radiating the laser beam, a horizontal deflection controller (HD), metal wires (261-26n+1) arrayed with certain intervals for forming a negative charged dormant image on the drum charged by positive electrons emitted by the electron gun, and a sealing glasses (22,23) for sealing the glass plastes (20,21) and the metal wires (261-26n+1).

Description

Printer scanning device using cathode ray tube

1 is a block diagram of a conventional laser printer.

2a, b is a side view and a plan view of a cathode ray tube scanning device according to the present invention.

3 is a state diagram of scanning on a charging drum with a cathode ray tube scanning apparatus according to the present invention.

4 is a state in which an electric latent image is formed on the drum.

5 is a schematic view of a printer using a cathode ray tube scanning device according to the present invention.

6 is a video signal waveform diagram according to the present invention.

* Explanation of symbols for main parts of the drawings

20, 21: upper and lower glass plate 22, 23: sealed glass

26, 26 ₁ -26 _{n + 1} : Metal wire 27: Charge drum

28: insulator metal EG: electron gun

Hd: Horizontal Deflector

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high speed, high resolution printer, and in particular, a printer using a CRT capable of high speed and high resolution printing using a cathode ray tube (CRT) scanning apparatus. Relates to a device.

In general, printers using lasers, magnetics, light emitting diodes, ions, liquid crystal shutters, etc. are commercialized. In such a printer, a laser printer configured as shown in FIG. 1 has been spotlighted as a computer output device. FIG. 1 is a block diagram of a conventional laser printer. The laser device 1 generating the laser beam, the lens 2 and the light through the lens 2 are applied to a predetermined signal. An optical modulator 3 for modulating by means, a beam lens 4 for condensing and emitting light modulated by the optical modulator 3, and a motor 5 for rotating a rotating polygon mirror And thereby rotated by the multi-faceted mirror 6 for scanning the light through the snake lens 4, the fθ lens 7 for adjusting the scanning and focusing angle, and the fθ lens 7 A mirror 8 for reflecting the emitted light, a photosensitive drum 9 for forming an electrostatic latent image, a charging unit 10 for charging the photosensitive drum 9 to positive, and the photosensitive drum 9 The developing unit 11 for developing the latent image formed on the image, the transfer charger 12 for remaining the latent image formed on the photosensitive drum 9 on paper, and the hopper 19A A feed roller and belt 13 for feeding the printer paper, a fixing unit 14 for fixing the transferred contents on the printer paper, and a discharge roller for rolling the printer paper mounted on the fixing unit 14 ( 15-16) and a stacker 19B for stacking the discharge printer paper of the discharge roller 15-16.

Looking at the operation of the conventional laser printer configured as described above, the laser light generated from the laser device 1 is input to the optical modulator 3 through the lens (2).

At this time, the optical modulator 3 receives a predetermined control signal, modulates (on / off) the incident light, and enters the rotating polygon mirror 6 as a point light source through the beam lens 4.

In addition, the rotating mirror mirror 6 which enters the modulated laser beam scans the light incident by the rotation of the motor 5, adjusts the scanning focus point and the focusing angle by the f? Lens 7, and mirrors the optical signal. Reflected as (8), the photosensitive drum 9 is exposed.

At this time, the photosensitive drum 9 has a three-layered structure in which a deposition film of a photoelectric semiconductor (usually selenium) is sandwiched between the insulating layer and the metal plate, and the insulating layer of the photosensitive drum 9 is formed of the charging portion 10. It is positively charged by corona discharge. The portion exposed by the laser beam data generated by the optical modulator 3 is neutralized by flowing (+) electric charges into the grounded metal plate through which the photoelectric semiconductor is conducted, and the electrostatic latent image on the photosensitive drum 9 by the remaining charges. Is formed. As described above, the loaded latent image formed on the photosensitive drum 9 does not adhere toner due to repulsion of the toner of the developing part 11 charged with (+) with the positive charge of the photosensitive drum 9. The exposed portion, where the positive charges disappear, becomes negative due to the overall charge balance, and the toner adheres. In addition, the paper fed from the hopper 19A by the transfer charger 12 is charged with (-). When the paper is in close contact with the photosensitive drum 9, the positive toner on the photosensitive drum 9 Developed toner is adhered to the paper and transferred.

Therefore, the key point transferred to the printer paper as described above is rolled to the fixing unit 14 by the rotation of the paper feed roller and the belt 13, whereby the printer paper to which a predetermined image is transferred is generated at the fixing unit 14. It is fixed by heat and accumulates in the stacker 19B by rolling the discharge roller 15-16. On the other hand, after being transferred to the printer paper, the toner of the photosensitive surface on the photosensitive drum 9 is removed by the cleaning part 17, and the charge on the photosensitive drum 9 from which the toner is removed is removed from the static electricity removal part 18. It is removed by action.

The laser printer operated in this way is a problem that firstly, it is difficult to manufacture a rotating facet mirror 6 for scanning light on the latent drum 9, and the cost increase surface is greatly increased. And productivity of an optical system including expensive precision optical components such as an fθ lens 7 for adjusting the focusing light, are very difficult.

Accordingly, an object of the present invention is to provide a CRT scanning device for one (1) scanning line, in which wires having good conductivity are insulated at a predetermined interval in a row.

Still another object of the present invention is to provide a printer for printing an electrostatic latent image by scanning printing information on a charging drum using a CRT scanning device for one scan line, and developing the same.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2A and 2B are a sectional view and a plan view of a CRT scanning apparatus according to the present invention, in which an electron gun EG for firing an input signal into an electoron beam and an electron beam emitted from the electron gun EG in a horizontal direction Horizontal deflector Hd for deflection, upper and lower glass plates 20 and 21 provided with a width for scanning one scanning line, and a center of the upper and lower glass plates 20 and 21 are arranged in a row and at a predetermined interval. A plurality of small conductive wires (26 ₁ -26 _{n + 1} ) having a small diameter and high conductivity provided to form a dot (DOT) at a portion where the electrons emitted from the electron gun EG collide with each other, and the upper and lower glass plates 20 It consists of the sealing glass 22, 23 which encloses between and to 21 by vacuum.

FIG. 3 is a state diagram of scanning on a cathode ray tube scanning device charging drum according to the present invention, and shows scanning with a CRT scanning device of FIGS. 2A and 2B on a charged drum 27 charged with (+). FIG. 4 is a diagram showing a latent image caused by electrons on the charging drum 27 by the conductive wires 26 and 26 _{n + 1} at regular and one row intervals when scanning the data of one scan line as shown in FIG. First, the CRT scanning apparatus and its operation of the present invention will be described with reference to FIGS. 2A, 3B, 3, and 4. Now, when one scan (one horizontal scan) period data is input to the terminal 100 as an electrical signal, the electron gun EG emits the electron beam e into the CRT in a vacuum state according to the input signal.

At this time, the electron beam (e) emitted from the electron gun is scanned in the horizontal direction by the horizontal control of the horizontal deflector (Hd) attached to the neck (Neck) to have a small diameter and good conductivity metal wire (26) ₁ -26 _{n + 1} ), where n is a natural number other than "0", as shown in FIG. 3 (Figure 2b).

Said metal wires (26 ₁ -26 _{n + 1)} successively with an electron beam (e) an isolated metal 28 of the charging drum 27 been charged to bump into (+) is the (-) electron beam (e) of the fourth The latent image 25 is formed as a tile.

As described above, the latent image 25 of the charging drum 27 formed of (-) electrons adheres to the latent image 25 by the (−) electrons, as the toner charged with (+) as described in FIG. In the rest, it is repelled by the (+) charge.

Therefore, about 400 DPI (Dots per Inch) when a small diameter (about 50 µm) conductive metal wires are arranged in a row at a predetermined interval on the part where the electron beam e of the CRT collides, that is, the part constituting the dot. The image having a high resolution can be realized.

Therefore, when one scan line having information with a horizontal synchronous signal is scanned at a high speed, the insulating metal 28 of the charging drum 27 is formed through a highly conductive metal wire 26 ₁ -26 _{n + 1} . It can be seen that it can cause a latent image.

5 is an embodiment of the printer of the CRT scanning apparatus using the CRT scanning apparatus of FIG. 4, the CRT scanning apparatus 1000 having the configuration of FIG. 2 described above, and the charging drum 27 charged with (+). And a developing unit 30 for developing the latent image 25 by the scanning of the CRT scanning apparatus 1000 with (-) the electron beam e, with the toner charged with (+), and the hopper 35 A transfer unit 31 for transferring the latent image 25 developed by the toner to the charging drum 27 by transferring the print paper fed from the to (-), and the print transferred by the transfer unit 31. And a fixing unit 34 for fixing the transferred sheet to the printing paper by applying heat to the sheet, and a stacker 36 for stacking the sheets discharged after being fixed by the fixing unit 34.

6 is a waveform diagram of a horizontal video signal applied to the CRT scanning apparatus 1000, and is an example in which one horizontal period 1H is 210.4 µsec.

The printer of the CRT scanning apparatus using the CRT scanning device of the present invention will be described with reference to the above-described drawings of FIGS. If data of horizontal scanning having a period of 210.4 μsec as shown in Fig. 6 is input to the signal input terminal 100 of the CRT scanning apparatus 1000 configured as shown in Fig. 6, the CRT scanning apparatus 1000 is input within 210.4 μsec. Horizontal scanning is performed as shown in FIG. 2B in accordance with the logic of the data within 1 horizontal scanning period 1H. At this time, the electron beam (e) emitted from the electron gun (EG) of the CRT scanning device 1000 is sequentially hit a plurality of metal wires (26 _{1 ...} 26 _{n + 1} ) arranged in a row at a predetermined interval. Accordingly, a latent image is formed on the surface of the charging drum 27 of the positive charge provided in proximity to the plurality of metal wires 26 _{1 to} 26 _n-1 as described above. Therefore, a latent image of an image signal due to the scanning of the CRT scanning apparatus 1000 also occurs in one horizontal line of the charging drum 27.

That is, when one scan line having information of 210,4 μsec cycles of horizontal synchronization signal is scanned at a high speed, a charged drum charged with (+) through a highly conductive metal wire (26 ₁ -26 _{n + 1} ) The negative electrons on (27) form a latent image.

As described above, the latent image formed on the charging drum 27 adheres to the latent image portion of the developing unit 30 with the positive (e), and the positive portion of the charging drum 27 is charged to the remaining portion. It will not stick to the repulsion of the toner charged with and (+).

In this way, when the charging drum 27 developed by the toner rotates in the direction of an arrow (→), the print paper fed from the hopper 35 is transferred to the negative (-) by the transfer unit 31, thereby charging the charging drum 27. The transferred image is transferred to the fixing unit 34 by the rotation of the paper feed roller 37, and the fixing unit 34 applies heat having a predetermined temperature to the print paper to transfer the transferred image (image) to the printing paper. It adheres and conveys to the stacker 36.

At this time, the image is transferred to the printer paper by the development of the toner, and the toner of the charging surface of the charging drum 27 is removed from the cleaning 32, and the negative charge (latent image) on the drum 27 is removed by the static eliminator 33. ) Is removed.

Therefore, in case of A4 paper, the width: length is 210mm × 297mm, so considering 160 dots per mm, the total number of dots in A4 paper is (210mm × 16 dots) × (297mm × 16 dots) = 16 million, and one horizontal The line is 3360 (210 mm x 16 dots). Accordingly, as shown in FIG. 6, one horizontal scan line having a signal component of 3360 dots is scanned at a period of 210.4 μsec. It can be seen that one page of 4752 can be printed in one second and 60 pages per minute (60PPM).

As described above, the present invention simplifies the structure of the printer by producing a latent image on the charging drum by using a CRT scanning device for single scan line, in which a good conductive metal wire is insulated and arranged at a predetermined interval. Higher work efficiency enables high speed and high resolution printing, and at the same time, it has a great advantage in cost reduction.

Claims (2)

In the cathode ray tube scanning device, the upper glass plate 20 and the lower glass plate 21 are disposed in parallel, and a predetermined signal is input to the inner surface of the upper and lower glass plates 20-21 to radiate the signal with the electron beam. A built-in electron gun EG, a horizontal deflection controller Hd for horizontal deflection of the electron beam emitted by the electron gun EG, and control of the electron gun EG and horizontal deflection Hd. on the charged drum it has been charged with electrons (+) which is emitted by the (-), the conductivity in the middle of a good metal wire (26 between the top and bottom glass plates (20-21) to the latent image of the charge maethige ₁ -26 _{n + 1)} is of the four-way line and is arranged is insulated at a constant interval, the upper and lower glass plates 20-1 metallic wires (26 ₁ -26 _{n + 1)} by a vacuum between the state of the glass plates (20-21) CRT injection device, characterized in that consisting of a sealing glass 23, 22 to be sealed. A developing unit 30 for displaying a latent image formed on the charging drum 27 and a transfer unit 31 for transferring an image (latent image) of the charging drum 27 developed by the developing unit 30 to a printing paper. ), A cleaning unit 32 for cleaning the toner of the residue left after being transferred, a static eliminator 33 for eliminating the latent charge of the drum 27 that has been cleaned by the cleaning unit 32, and in a printing device, a good conductive metal wires (26 ₁ -26 _{n + 1)} a predetermined interval of one scanning line beam CRT scanning process, which is isolated is arranged with a mounting portion 34 for fixing by applying heat to the print media A printer apparatus, characterized in that a predetermined data is scanned by means of an apparatus to form a latent image by electrons scanned according to information (+ charge) on a charging drum (27).

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