JPS62136668A - Image recording device - Google Patents

Abstract

PURPOSE:To form an image of good quality without being affected by scattered toner by providing a developing means, an image exposing means in a photosensitive body, and shield members at opening parts at both ends of the photosensitive body. CONSTITUTION:Opening parts of the photosensitive body 1 are supported by flanges 10 and 11 and the flange 10 is supported on a stepped shaft 13 through a bearing 12-1. This stepped shaft 13 is fixed to the side wall 14 of an image recording device. The flange 11 is supported on the stepped shaft 13 through a bearing 12-2. Therefore, the photosensitive body 1 is rotatable around the stepped shaft 13. A gear 15 at the outer peripheral part of an end part of the flange 10 is rotated by an unshown motor and the photosensitive body 1 rotates in a necessary direction. An image exposing means 3 and an electrostatic discharging light source 9 are provided to the fixed stepped shaft 13. A shield member 14-1 which prevents toner scattered from the photosensitive body 1 from entering the device is fitted to the side wall 14 of the device and a shield member 4-2 is fitted to the side of the flange 11 through a washer with a nut. Consequently, the blurring or absence of an image or an irregularity in image density due to the scattered toner is eliminated to improve the image quality.

Description

[Detailed Description of the Invention] [Summary] The present invention comprises an endless photoreceptor comprising a transparent substrate, a transparent conductive layer, and a photoconductive layer, and an image exposure means and a toner developing means inside and outside the photoreceptor. In an image recording apparatus, a shielding member is provided at an opening of an endless photoreceptor to prevent toner from scattering inside the endless photoreceptor, thereby making it possible to output a clear image.

[Industrial application field]

The present invention relates to an image recording apparatus, and more particularly to an electrophotographic image recording apparatus that performs image exposure from the transparent substrate side of a photoreceptor.

2. Description of the Related Art Electrophotographic processes are widely used as a means of outputting information in fields such as information processing.

The Carlson process is widely known as this electrophotographic process. This Carlson process uses a photoreceptor as a recording medium, and after uniformly charging the photoreceptor, images are exposed, developed, transferred, and fixed.

Image recording is performed by repeating the steps of static elimination and cleaning. As mentioned above, this method involves many steps and the equipment becomes large.

In order to deal with this, image exposure means and static elimination means are installed on the back surface of the photoreceptor, thereby achieving miniaturization.

[Conventional technology]

A conventional image recording device will be explained with reference to FIG.

The photoreceptor 1 has an endless cylindrical shape, and the transparent substrate 1
-1, a transparent conductive layer 1-2, and a photoconductive layer 1-3, and rotates in the direction of the arrow. Note that the transparent conductive layer 1-2 is 1. Grounded.

A developing device 2 operating as a developing means is filled with conductive magnetic toner, and a developing bias is applied to the first magnetic brush 2-1 by a power source 5.

Note that in the developing device 2, the second magnetic brush 2-2 is grounded and collects unexposed toner.

The image exposure means 3 includes a laser optical system, an LED array optical system, and other exposure means.

The photoreceptor 1 is rotated in the direction of the arrow, and the first magnetic brush 2-1 is rotated to convey toner to the photoreceptor 1 while applying a developing bias. In this state, the image exposure means 3 performs image exposure based on the image pattern.

Photocarriers generated within the exposed photoconductor 1-3 move toward the surface and form a latent charge image.

Toner charged to the opposite polarity to the latent image charge adheres to the surface of the photoreceptor 1, forming a toner image. Note that photoreceptor 1
The toner on the top is indicated by a small circle. At this time, a magnetic brush 2-1 and a transparent conductive layer 1 are placed on the surface of the photoreceptor 1 in the non-exposed area.
-2 and the electric field acts to cause excess toner to adhere.

The second magnetic brush 2-2 which is grounded removes this excess toner.
is collected by electrostatic force and magnetic force, and excess toner on the photoreceptor 1 is removed.

The toner adhering to the exposed area is held by the latent image charge, transferred to the recording paper 7 by the transfer roller 6, and fixed by the fixing device 8, so that a recorded image is obtained on the recording paper.

The charge of the toner remaining on the photoreceptor 1 after the transfer is removed by the charge removal light source 9, and the latent image charge on the photoreceptor 1 is also removed, and the toner is collected by the first magnetic brush 2-1. Since the image exposure means 3 for forming the image is located on the opposite side of the photoreceptor 1, this recovery is equally trouble-free. The above steps are repeated to record an image.

[Problem that the invention seeks to solve]

In conventional image recording devices, since the developing means transports the toner, the toner scatters and adheres to the inner surface of the photoreceptor, that is, the side of the image exposure means, lowering the light transmittance and degrading the image quality. There was a problem.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional situation, it is an object of the present invention to provide an image recording apparatus that can record images of good quality without being affected by scattered toner.

[Means for solving problems]

In the present invention, as shown in FIG. 1, a shielding member 4 is provided at the opening of an endless photoreceptor 1 composed of a transparent substrate 1-1, a transparent conductor 1'1il-2, and a photoconductive layer 1-3. It is.

[Effect]

The toner scattered by the developing means 2 is prevented from adhering to the inside of the photoreceptor 1 by the shielding means 4, so that the exposure transmittance can be kept constant and the image quality can be improved.

〔Example〕

FIG. 2 is a sectional view of a main part showing an embodiment of the present invention. The opening of the photoreceptor 1 is supported by flanges 10 and 11, and the flange 10 is supported by a stepped shaft 13 via a bearing 12-1. This stepped shaft 13 is the side wall 1 of the image recording device.
It is fixed at 4. The flange 11 is a bearing 12-
It is supported by the stepped shaft 13 via 24.

Therefore, the photoreceptor 1 can rotate around the stepped shaft 13. Note that the flanges 10.11 are perforated to reduce weight.

A gear 15 is provided on the outer periphery of the end of the flange 10, and the gear 15 is rotated by a motor (not shown), thereby causing the photoreceptor 1 to rotate in a desired direction. Image exposure means 3
and the static elimination light source 9 are provided on a fixed stepped shaft 13.

A shielding member 4-1 (metal plate, or a shielding member 4-1 that prevents toner scattered from the photoreceptor 1 from penetrating into the side wall 14 of this device, which has a filter function for toner and has good ventilation to dissipate internal heat generation) For example, cloth.

(sponge, paper, etc.), and then attach the shielding member 4-2 to the flange 11 side with a washer and a nut.

Although the above explanation has been made assuming that the photoreceptor 1 is cylindrical, the problem is not limited to a cylinder, and the same problem will occur even if the photoreceptor is applied to an image recording apparatus in which the photoreceptor is interposed between the developing means and the image exposure means. Needless to say, there is no such thing.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, image quality does not deteriorate due to scattered toner, such as blurred images, missing images, or uneven image density, and the image quality is reduced. If it is applicable to recording devices, it will be extremely useful in terms of image quality.

[Brief explanation of drawings]

FIG. 1 is a diagram of the principle of the present invention, FIG. 2 is a sectional view of a main part showing an embodiment of the invention, and FIG. 3 is a schematic diagram of a main part of a conventional image recording apparatus. In the figure, 1 is a photoreceptor, 1-1 is a transparent substrate, ■-2 is a transparent conductive layer, L3 is a photoconductive layer, 2 is a developing means, 3 is an image exposure means, 4, 4-1 and 4-2 are A shielding member is shown. D; f4 Do 0 month principle diagram No. 1 Diagram 1 Mimesha and 6B←ri! Je Bu] Ken tt: tv Imo t Ji Aji 91 no'/LM Figure 2

Claims (1)

[Claims] A transparent substrate (1-1) and a transparent or semi-transparent conductive layer (1-1)
2) and a photoconductive layer (1-3).
), an image exposure means (3) provided inside the endless photoreceptor (1), and a developing means (2) provided outside the endless photoreceptor (1); Photoreceptor (1
1. An image recording device characterized in that a shielding member (4) is provided at the opening of the opening.