JPS62144179A - Printer device - Google Patents

Abstract

PURPOSE:To properly select an optimum illuminating lamp in accordance with a used photosensitive sheet by constituting a latent image writing means with the illuminating lamp and a liquid crystal shutter. CONSTITUTION:A latent image writing part 5 consists of a housing 12 arranged in the lengthwise direction of a scroll drum 4, a fluorescent lamp 13 which is provided in the lengthwise direction of the housing 12 in the housing 12 and has 540n'm optical characteristic, and a liquid crystal shutter 17 which is provided in the lengthwise direction of the housing 12 on the scroll drum 4 side of the housing 12 and consists of a liquid crystal panel 14 and upper and lower electrode groups 15 and 16 on both sides of this panel 14. Electrode groups 15 and 16 are connected to a picture reading part 19 arranged under a platen 18, and electrode groups 15 and 16 are turned on and off based on the electric signal outputted from the reading part 19, and a liquid crystal in the liquid crystal panel 14 is allowed to develop or extinguish colors to transmit through or intercept the light from the fluorescent lamp.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a printer that repeatedly obtains printed matter using an electrostatic printing plate on which a printed image composed of insulating toner or conductive toner is fixed. The present invention relates to an apparatus, and in particular, to an improvement of a printer apparatus which can use a wide variety of photosensitive sheets and which can be made smaller and lower in cost.

[Prior Art] As a conventional printer device of this type, the one shown in FIG. 3 is known.

That is, this device includes a scroll drum (b) that is placed inside the device body (a) and rotates in the direction of the arrow, and a scroll drum that is mounted inside this drum (b) and wound around the outer circumferential surface of the drum (b). A supply roller (d) for carrying out the photosensitive sheet CC) and a take-up roller (e) for winding it up
, a latent image writing section (f) provided along the periphery of the scroll drum (b), and a charged corotron (0
), full exposure lamp (h), developing/cleaning device (i
), transfer and static elimination corotron (j), peeling belt (k),
and a flash fixing device (1) for plate making. In Fig. 3, (m) (m) indicates the paper feed cassette, (n) indicates the paper conveyance belt, and (0
) indicate the respective fixing devices.

To obtain a single copy from a different type of original using this device, after setting the device to copy mode by operating an operation button (not shown), press the A document (Q) is placed on the platen (p) surface, read by the image reading section (r), and outputs the signal to the latent image writing section (f>). A latent image of the original (Q) is written on the photosensitive sheet (C) charged by the charged corotron (Cl'), and then developed with toner by the developing/cleaning device (1), and this toner image is transferred to the photosensitive sheet (C) charged by the charging corotron (Cl'). The image is transferred onto paper (S) supplied from a paper cassette (m>) by a transfer/static elimination corotron (j),
The image is then fixed by a fixing device (0) to obtain a copy. Note that the scroll drum (b) mentioned above has a copy end violation.
During the rotation, the photosensitive sheet (C) is neutralized by a transfer/discharge corotron (j) and a full-surface exposure lamp (h), and cleaned by a developing/cleaning device (i) before being used for the next copy. It is configured as follows.

On the other hand, in order to obtain multiple copies of the same type of original, first operate the operation button described above to enter the retention mode, and then first write a latent image of the original (a) on the photosensitive sheet (C) using the same process as in the copy mode described above. , this is developed using the developing/cleaning device (i) to form a printed image of insulating toner or conductive toner, and this image is fixed using a flash fixing device for plate making (1) to form an electrostatic printing plate; Next, this electrostatic printing plate is charged with the above-mentioned charging corotron (g) [see Fig. 4 (△)] and exposed with a full-surface exposure lamp (h) to form a conductive part (1) and an insulating part (IJ). This latent image is developed with toner using the developing/cleaning device (i>) [see FIG. 4(C)], and this toner is transferred to -F. The process is transferred to a paper (S) using a corotron (J) that also serves as a charge remover (see Figure 4 (D)), and is then fused using a fixing device (0) to obtain a copy. A large number of copies are continuously obtained by repeating the process of charging the plate → whole surface exposure process → toner development process → transfer process → fixing process. After completing the multiple copying process, the scroll drum (b) The inner winding roll (e) rotates to wind up the photosensitive sheet (C), which is the electrostatic printing plate, and a new photosensitive sheet (C) is placed on the scroll drum (b).
is configured to be supplied. Furthermore, although FIG. 4 shows an electrostatic printing plate on which a printed image is formed using insulating toner, if the image is formed using conductive toner, the conductive portion and the insulating portion are separated in the charging process. Since a latent image consisting of is directly formed, the above-mentioned entire surface exposure step is not necessary.

[Problems to be Solved by the Invention] However, in this type of device, the photosensitive sheet (c
) are mainly used as zinc oxide photosensitive paper, which is a paper base coated with zinc oxide, a photoconductive material, and organic photosensitive sheets, which are film sheets coated with organic photo semiconductors such as polyvinyl carbazole. However, zinc oxide photosensitive paper is the mainstream.

However, this zinc oxide photosensitive paper has a spectral sensitivity of 5.
60n, m front, so if a small, stationary semiconductor laser or light emitting diode, etc. that does not have the above-mentioned optical characteristics is used as a latent image writing means, there is a problem that a latent image will not be formed on the photosensitive paper. there were.

For this reason, in conventional devices, a He-Ne laser that satisfies the above-mentioned optical characteristics and extinguishes light in response to an electrical signal is mainly used as a latent image writing means, but in such a case, the device becomes large and costly. On the other hand, if a photosensitive sheet other than zinc oxide photosensitive paper was used in this device, the characteristics would change depending on the spectral sensitivity, making it impossible to write a latent image.

[Means for Solving the Problems] The present invention has been made in view of the above problems, and its object is to provide a method that allows the use of many types of photosensitive sheets.
Moreover, the object is to provide a small and inexpensive printer device.

That is, the present invention forms an electrostatic latent image on the photosensitive layer of a carrier provided with a photoconductive photosensitive layer by a latent image writing means,
This is developed with an insulating toner or an i-conductive toner and fixed to form an electrostatic printing plate.The plate is charged and the entire surface of the plate is exposed as necessary to create a latent material consisting of a conductive part and an insulating part. In a printer device that forms an image, develops this latent image with toner, and transfers this toner from the plate to a recording medium to repeatedly obtain printed matter, the latent image writing means includes an illumination lamp and the lamp. A liquid crystal shutter is provided on the plate side of the plate and transmits or blocks light from the lamp based on an appropriate image signal.

[Operation] The present invention operates as follows. That is, in the printer device of the present invention, since the latent image writing means is composed of an illumination lamp and a liquid crystal shutter, by appropriately selecting the illumination lamp, it is possible to appropriately correspond to the photosensitive characteristics of the photosensitive sheet applied to this device. can be done.

Therefore, by replacing the He-Ne laser described above with an illumination lamp having the same optical characteristics as this, it is possible to make it compatible with zinc oxide photosensitive paper, and the device can be made smaller and lower in cost. By changing to an illumination lamp having the optical characteristics of , it is possible to use photosensitive sheets other than zinc oxide photosensitive paper, and the range of application thereof can be expanded.

[Example] Hereinafter, an example of the present invention will be described in detail.The printer device of the present invention is similar to the conventional device, as shown in FIG. A scroll drum (4) equipped with a take-up roller (3), a latent image writing section (5) provided along the periphery of this drum (4), a charging corotron (6), and a full-surface exposure lamp (7).
, a developing/cleaning device (8), a transfer/discharging corotron (9), a peeling belt (10), and a plate-making flattening fixing device (11).

The latent image writing section (5) includes a housing (12) disposed along the length of the scroll drum (4) as shown in FIG. A fluorescent lamp (13) having a light characteristic of 540 nm and 540 m is provided along the length of the scroll drum (4) side of the housing (12), and an upper portion is provided with the liquid crystal panel (14) in between. It is composed of a liquid crystal shutter (17) consisting of an electrode group (15) and a lower electrode group (16).

Each of the electrode groups (15) and (16) is connected to an image reading section (19) arranged on the lower surface side of the platen (18), and receives the electrical signal 1 output from this reading section (19). Based on each of the above electrode groups (15) (16)
are configured to turn on and off, respectively, and color or decolor the liquid crystal in the liquid crystal panel (14) to transmit or block light from the fluorescent lamp. (20 in FIG. 2) (21) is the light guide that guides the light from the fluorescent lamp (13), and (21) is the liquid crystal shutter (17).
) is an imaging lens that forms an image of the light transmitted through the zinc oxide photosensitive paper (1) on the scroll drum (4), and (22) indicates a cover glass, and in FIG. 1, (23) (23 ) indicates a paper feed cassette, (24) a paper conveyance belt, and (25) a fixing device.

In this device, since the fluorescent lamp (13) has a light characteristic of 540 nm, the zinc oxide photosensitive paper (13) does not require the use of a large and expensive He-Ne laser.
), it is possible to form a latent image on the image, making it possible to reduce the size and cost of the device.

Furthermore, in place of the fluorescent lamp (13), various types of illumination lamps having different light characteristics can be used, and photosensitive sheets other than the zinc oxide photosensitive paper (1) can also be used.
The range of photosensitive sheets applicable to this device can be expanded.

[Effects of the Invention] As described above, in the printer device of the present invention, the latent image writing means is composed of an illumination lamp and one liquid crystal screen, so it is possible to select the most suitable illumination lamp according to the photosensitive sheet used. can be selected as appropriate.

Therefore, it is possible to form a latent image on zinc oxide photosensitive paper without using an expensive He-N e laser, etc., and it is possible to reduce the size and cost of the device. This has the effect of expanding the range of the photosensitive sheet.

[Brief explanation of drawings]

1 and 2 show embodiments of the present invention. FIG. 1 is a side sectional view of the printer device of the present invention, FIG. 2 is a vertical sectional view of the latent image writing section, and FIG. FIG. 3 is a side sectional view of a conventional printer device, and FIG. 4 is an explanatory view showing its print culm. [Description of symbols] (1)...Zinc oxide photosensitive paper (2)...Supply roller (3)...Take-up roller (4)...Scroll drum (5)...Latent image loading section (6)...Charging corotron (7)...Full surface exposure lamp (8)...Carrier and cleaning device (9)...Transfer and charge removal corotron (10)...Peeling belt (11) ...Flash fixing device for plate making (12)...
Housing (13)... Fluorescent lamp (14)... Liquid crystal panel (15)... Upper electrode group (16)... Lower electrode group (17)... Liquid crystal shutter (18)... Platen (19)...Image border section (20)...Light guide (21)...Imaging lens (22)...Cover glass <23)...Paper feed cassette (24)... Paper conveyance belt (25)...Fuser patent applicant Fuji Xerox Co., Ltd. Representative Patent attorney Satoshi Nakamura *(2 others)
4 Also crawl root'” ram Figure 3 Figure 4

Claims (2)

[Claims] (1) In the photosensitive layer of the carrier comprising a photoconductive photosensitive layer,
An electrostatic latent image is formed by a latent image writing means, this is developed with an insulating toner or a conductive toner, and fixed to form an electrostatic printing plate.The plate is charged and the entire surface of the plate is exposed as necessary. In a printer device that forms a latent image consisting of a conductive part and an insulating part, develops this latent image with toner, and transfers this toner from the plate to a recording medium to repeatedly obtain printed matter, A printer characterized in that the latent image writing means comprises an illumination lamp and a liquid crystal shutter provided on the plate side of the lamp to transmit or block light from the lamp based on an appropriate image signal. Device. (2) The printer device according to claim 1, wherein the illumination lamp is constituted by a fluorescent lamp.